U.S. patent application number 14/182181 was filed with the patent office on 2014-08-21 for seat adjusting device and method of providing seat adjustment.
The applicant listed for this patent is SCHUKRA GERAETEBAU GMBH. Invention is credited to Berthold Bocsanyi.
Application Number | 20140232155 14/182181 |
Document ID | / |
Family ID | 47757363 |
Filed Date | 2014-08-21 |
United States Patent
Application |
20140232155 |
Kind Code |
A1 |
Bocsanyi; Berthold |
August 21, 2014 |
SEAT ADJUSTING DEVICE AND METHOD OF PROVIDING SEAT ADJUSTMENT
Abstract
A seat adjusting device comprises a plurality of inflatable
chambers and a valve module. The plurality of inflatable chambers
includes a first inflatable chamber and a second inflatable
chamber. The valve module comprises a control valve which is a
4/4-way valve having four ports and four positions. A first port of
the control valve is in communication with the first inflatable
chamber and a second port of the control valve is in communication
with the second inflatable chamber.
Inventors: |
Bocsanyi; Berthold;
(Leinburg, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SCHUKRA GERAETEBAU GMBH |
Berndorf |
|
AT |
|
|
Family ID: |
47757363 |
Appl. No.: |
14/182181 |
Filed: |
February 17, 2014 |
Current U.S.
Class: |
297/284.6 ;
297/452.41; 297/463.1 |
Current CPC
Class: |
A47C 4/54 20130101; A47C
7/467 20130101; B60N 2/914 20180201 |
Class at
Publication: |
297/284.6 ;
297/463.1; 297/452.41 |
International
Class: |
A47C 7/46 20060101
A47C007/46; A47C 4/54 20060101 A47C004/54 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 20, 2013 |
EP |
13 156 011.2 |
Claims
1. A seat adjusting device comprising: a plurality of inflatable
chambers including a first inflatable chamber and a second
inflatable chamber; and a valve module in communication with the
plurality of inflatable chambers, the valve module comprising a
control valve, wherein the control valve is a 4/4-way valve having
four ports and four positions, and wherein a first port of the
control valve is in communication with the first inflatable chamber
and a second port of the control valve is in communication with the
second inflatable chamber.
2. The seat adjusting device of claim 1, wherein the control valve
includes an internal channel and a first solenoid, the control
valve configured such that the internal channel is in communication
with the first port when the first solenoid is deenergized and the
internal channel is in communication with the second port when the
first solenoid is energized.
3. The seat adjusting device of claim 2, wherein the control valve
includes a second solenoid, the control valve being configured such
that the internal channel is in communication with a third port of
the control valve when the second solenoid is deenergized and the
internal channel is in communication with a fourth port of the
control valve when the second solenoid is energized.
4. The seat adjusting device of claim 3, wherein the third port is
in communication with a fluid supply channel and the fourth port is
in communication with a fluid discharge channel.
5. The seat adjusting device of claim 4, wherein the fluid supply
channel and the fluid discharge channel are delimited by walls of a
housing of the valve module.
6. The seat adjusting device of claim 4, further comprising a
pressure fluid source coupled to the fluid supply channel.
7. The seat adjusting device of claim 6, wherein the valve module
comprises a fluid supply control valve coupled to the fluid supply
channel.
8. The seat adjusting device of claim 3, wherein the control valve
comprises a valve body around which both the first solenoid and the
second solenoid are wound.
9. The seat adjusting device of claim 2, wherein the valve module
includes a housing having plural walls, and wherein the first port
of the control valve is in communication with a first connector and
the second port of the control valve is in communication with a
second connector, and further wherein the first connector and the
second connector are provided on the same wall of the housing.
10. The seat adjusting device of claim 1, wherein one of the first
inflatable chamber and the second inflatable chamber is a chamber
of a lumbar support device, and wherein the other one of the first
inflatable chamber and the second inflatable chamber is a chamber
of a side support device.
11. The seat adjusting device of claim 1, wherein the valve module
comprises at least one further 4/4-way control valve.
12. The seat adjusting device of claim 11, wherein the at least one
further 4/4-way control valve has a first port in communication
with another chamber of a lumbar support device and a second port
in communication with another chamber of a side support device.
13. A seat comprising: a seat adjusting device including at least
one inflatable chamber, and a valve module in communication with
the at least one inflatable chamber, the valve module comprising a
control valve, wherein the control valve is a 4/4-way valve having
four ports and four positions.
14. A method of providing seat adjustment by controlling a control
valve to selectively supply fluid to a plurality of inflatable
chambers or to selectively discharge fluid from the plurality of
inflatable chambers, the method comprising: controlling the control
valve, which is a 4/4-way valve having four ports and four
positions, wherein a first port of the control valve is in
communication with the first inflatable chamber and a second port
of the control valve is in communication with the second inflatable
chamber.
15. The method of claim 14, wherein the control valve has a first
solenoid and a second solenoid, and wherein controlling the control
valve includes selectively energizing and deenergizing the first
solenoid and/or the second solenoid to set the control valve to a
desired one of the four positions.
Description
TECHNICAL FIELD
[0001] Embodiments of the invention relate to a seat adjusting
device and to a method of providing seat adjustment. Embodiments of
the invention relate in particular to such seat adjusting devices
and methods which utilize control valves to provide pneumatic
adjustment of a seat contour. Embodiments of the invention relate
to such devices and methods which may be used for providing
adjustable support in a vehicle seat.
BACKGROUND
[0002] Lumbar supports, side supports or other adjustable supports
as well as massage units are frequently provided in seats to
enhance an occupant's comfort when seated on the seat. Lumbar
support devices are provided in backrests in order to provide
adequate support in the lumbar vertebral or lordosis region of a
person sitting on the seat by forming a suitable support surface.
Side supports are provided on a backrest and/or on a seat portion
to provide adjustable side support. The latter may be desirable not
only to accommodate varying occupant sizes, but also to actively
adjust lateral support in response to centrifugal forces. Massage
units may be integrated into a seat to stimulate blood circulation
and/or to further enhance occupant comfort.
[0003] Some implementations of seat adjusting devices utilize one
or plural inflatable fluid chambers. The fluid chambers may be
configured as inflatable cushions or bladders which change their
shape and/or size in dependence on an amount of fluid contained
therein. Examples for seats having lumbar support devices
implemented using inflatable fluid chambers are described in EP 1
072 465 A1 or in DE 100 63 478 A1. An adjustment of the adjustable
support may be effected by means of a pressure source and a
suitably configured pneumatic circuit comprising valves and
connecting members, such as tubes.
[0004] While pneumatic elements, such as valves, may enhance life
time of and/or comfort provided by the adjustable support device,
such components may add to installation space and cost. In order to
address problems associated with installation space, installation
time and installation cost, a plurality of valves can be assembled
to form a valve battery, which may be pre-assembled prior to
installation in a seat. DE 44 13 657 C1 describes an example for a
valve battery, with one valve being integrated into each module and
plural modules being combined to form the valve battery. EP 2 461
046 A1 describes a seat adjusting device which uses a plurality of
valves which includes one or several 3/3-way valves to attain a
significant degree of control over the various inflatable
chambers.
SUMMARY
[0005] There is a continued need in the art for seat adjusting
devices and methods in which plural inflatable chambers may be
inflated or deflated in a controlled manner, using a valve module
having a small number of valves. There is a continued need in the
art for a seat adjusting device and method which can be readily
integrated into a small installation space.
[0006] According to embodiments of the invention, a seat adjusting
device and a method of providing seat adjustment as defined by the
independent claims are provided. The dependent claims define
features of further embodiments.
[0007] According to exemplary embodiments, a seat adjusting device
comprises a control valve which is configured as a 4/4-way valve,
i.e., which has four working ports and four positions. A first
inflatable chamber is in communication with a first port of the
control valve. A second inflatable chamber is in communication with
a second port of the control valve. The control valve may be used
to control inflation and deflation of both the first inflatable
chamber and the second inflatable chamber.
[0008] According to exemplary embodiments, the control valve may
have a third port which communicates with a fluid supply channel.
In operation, a pressurized fluid, in particular gas, may be
supplied at the third port. The control valve may have a fourth
port which communicates with a fluid discharge channel. The control
valve may be configured such that, in a first position of the
control valve, the first port is in communication with the third
port, while there is no fluid communication between the first port
and the fourth port, no fluid communication between the second port
and the third port, and no fluid communication between the second
port and the fourth port. The control valve may be configured such
that, in a second position of the control valve, the second port is
in communication with the third port, while there is no fluid
communication between the second port and the fourth port, no fluid
communication between the first port and the third port, and no
fluid communication between the first port and the fourth port. The
control valve may be configured such that, in a third position of
the control valve, the first port is in communication with the
fourth port, while there is no fluid communication between the
second port and the third port, and no fluid communication between
the second port and the fourth port. The control valve may be
configured such that, in a fourth position of the control valve,
the second port is in communication with the fourth port, while
there is no fluid communication between the first port and the
third port, and no fluid communication between the first port and
the fourth port.
[0009] The control valve may be configured such that, in each one
of the four positions of the control valve, there is no fluid
communication between the first port and the second port.
[0010] According to exemplary embodiments, the control valve may
have a first solenoid and a second solenoid. The first and second
solenoids may be energized independently from each other, to
thereby implement the four positions of the valve. The control
valve may have a first armature which is displaced against a bias
force when the first solenoid is supplied with energy. The control
valve may have a second armature which is displaced against a bias
force when the second solenoid is supplied with energy.
Displacement of each armature may respectively cause one of the
ports of the control valve to become closed or opened.
[0011] A seat adjusting device according to an embodiment comprises
a plurality of inflatable chambers and a valve module. The
plurality of inflatable chambers includes a first inflatable
chamber and a second inflatable chamber. The valve module comprises
a control valve which is a 4/4-way valve having four ports and four
positions. A first port of the control valve is in communication
with the first inflatable chamber and a second port of the control
valve is in communication with the second inflatable chamber.
[0012] The control valve may comprise an internal channel and a
first solenoid. The control valve may be configured such that the
internal channel is in communication with the first port when the
first solenoid is deenergized and that the internal channel is in
communication with the second port when the first solenoid is
energized. The control valve may be configured such that the
internal channel is not in communication with the second port when
the first solenoid is deenergized and that the internal channel is
not in communication with the first port when the first solenoid is
energized. By selectively supplying energy to the first solenoid,
one of the first inflatable chamber and the second inflatable
chamber connected to the control valve may be selected for
inflating or deflating.
[0013] The control valve may comprise a second solenoid. The
control valve may be configured such that the internal channel is
in communication with a third port of the control valve when the
second solenoid is deenergized and that the internal channel is in
communication with a fourth port of the control valve when the
second solenoid is energized. The control valve may be configured
such that the internal channel is not in communication with the
third port of the control valve when the second solenoid is
energized and that the internal channel is not in communication
with the fourth port of the control valve when the second solenoid
is deenergized. By selectively supplying energy to the second
solenoid, an inflatable chamber may be deflated. By activating a
pressure fluid source, e.g. a pump, a gas or other fluid may be
supplied to an inflatable chamber when the second solenoid is
deenergized.
[0014] The third port may be in communication with a fluid supply
channel of the valve module. The fourth port may be in
communication with a fluid discharge channel of the valve module.
In operation, gas or another working fluid may be supplied via the
third port to an inflatable chamber through the control valve. Gas
or another working fluid may be discharged from an inflatable
chamber through the control valve and via the fourth port.
[0015] The fluid supply channel and the fluid discharge channel may
be delimited by walls of a housing of the valve module.
[0016] The seat adjusting device may comprise a pressure fluid
source coupled to the fluid supply channel. The pressure fluid
source may comprise a pump which provides gas under positive
pressure to the valve module. The pressure fluid source may be an
air pump. The pressure fluid source may have an integrated one-way
valve.
[0017] The valve module may comprise a fluid supply control valve
connected between the fluid supply channel and the pressure fluid
source. The fluid supply control valve may be a 2/2-way control
valve. The valve module may have plural fluid supply control valves
which are respectively connected between a fluid supply channel and
the pressure fluid source.
[0018] The control valve may comprise a valve body around which
both the first solenoid and the second solenoid are wound. The
internal channel may be formed in the valve body. First and second
armatures may be provided in the valve body. The valve body may be
formed from plastic. The valve body may be a metal core. The first
armature may be biased such that it is displaced in a first
direction when the first solenoid is energized. The second armature
may be biased such that it is displaced in a second direction
opposite to the first direction when the second solenoid is
energized. Thereby, the risk of undesired displacement of the first
armature by energizing the second solenoid, and vice versa, may be
mitigated.
[0019] The seat adjusting device may comprise a controller for
controlling energy supplied to the first solenoid and the second
solenoid. The controller may be configured such that energy
supplied to the first and second solenoids can be controlled
independently for the first solenoid and the second solenoid.
[0020] The valve module may have a housing which has plural
exterior walls. The first port of the control valve may be in
communication with a first connector and the second port of the
control valve may be in communication with a second connector. The
first connector and the second connector may be provided on the
same exterior wall of the housing. The first connector and the
second connector may be provided on a planar lateral side wall of
the housing.
[0021] One of the first inflatable chamber and the second
inflatable chamber may be a lumbar support chamber. The other one
of the first inflatable chamber and the second inflatable chamber
may be a side support chamber. By controlling a side support
chamber and a lumbar support chamber using one 4/4-way valve, the
control operations required in normal operation may be readily
implemented with one 4/4-way control valve.
[0022] The valve module may comprise only one 4/4-way valve. A
fluid pressure source, e.g. a pump, may be connected to one port of
the 4/4-way valve. A check valve may be connected between the one
port and the fluid pressure source. Another port of the 4/4-way
valve, e.g. the second port of the 4/4-way valve, may be connected
to an inflatable chamber. The inflatable chamber may be integrated
in a side bolster, for example.
[0023] The valve module may comprise at least one further 4/4-way
valve. The at least one further 4/4-way valve may have a first port
in communication with another lumbar support chamber and a second
port in communication with another side support chamber. Thereby,
independent control of two inflatable chambers of a lumbar support
and/or of two inflatable chambers of a side support may be realized
with a valve module which has two 4/4-way valves.
[0024] According to another embodiment, there is provided a seat
which includes the seat adjusting device of any aspect or
embodiment. The seat may be a vehicle seat. At least one of the
inflatable chambers may be mounted at a lumbar support region of
the seat. At least one of the inflatable chambers may be mounted at
a side support of the seat.
[0025] According to another embodiment, a method of providing seat
adjustment by controlling a control valve to selectively supply
fluid to a plurality of inflatable chambers or to selectively
discharge fluid from the plurality of inflatable chambers is
provided. The method comprises controlling a control valve which is
a 4/4-way valve having four ports and four positions, a first port
of the control valve being in communication with the first
inflatable chamber and a second port of the control valve being in
communication with the second inflatable chamber.
[0026] The control valve may have a first solenoid and a second
solenoid. The controlling may comprises selectively energizing the
first solenoid and/or the second solenoid to set the control valve
to a desired one of the four positions.
[0027] Further features of the method and the effects attained
thereby correspond to features of the seat adjusting device of
embodiments. The method may be performed using the seat adjusting
device of any one aspect or embodiment.
[0028] Embodiments of the invention may be used for providing seat
adjustment in seats, in particular in vehicle seats. Embodiments of
the invention may be used for providing contour adjustment of a
seat surface. Embodiments may be used for providing seat
adjustments in car seats, without being limited thereto.
BRIEF DESCRIPTION OF DRAWINGS
[0029] Embodiments of the invention will be described with
reference to the accompanying drawings, wherein like reference
numerals refer to like elements.
[0030] FIG. 1 is a schematic view of a seat having a seat adjusting
device according to an embodiment.
[0031] FIG. 2 is a view of a seat adjusting device according to an
embodiment.
[0032] FIG. 3 is an exploded perspective view of a valve module of
a seat adjusting device according to an embodiment.
[0033] FIG. 4, FIG. 5, FIG. 6 and FIG. 7 are sectional views of a
control valve of the valve module, showing four positions of the
control valve.
[0034] FIG. 8 is an exploded perspective view of a valve module of
a seat adjusting device according to another embodiment.
[0035] FIG. 9 is an exploded perspective view of a valve module of
a seat adjusting device according to another embodiment.
[0036] FIG. 10 is a plan view of a housing portion of the valve
module of FIG. 9 which may be used to define fluid channels.
[0037] FIG. 11, FIG. 12, FIG. 13 and FIG. 14 are sectional views of
a control valve of the valve module of FIG. 9, showing four
positions of the control valve.
[0038] FIG. 15, FIG. 16, FIG. 17 and FIG. 18 are sectional views
through a pair of fluid supply control valves of the valve module
of FIG. 9, showing the different positions of a pair of fluid
supply control valves.
DETAILED DESCRIPTION OF EMBODIMENTS
[0039] Exemplary embodiments of the invention will be described
with reference to the drawings. While some embodiments will be
described in the context of specific fields of application, such as
in the context of automotive vehicle seating, the embodiments are
not limited to this field of application. The features of the
various embodiments may be combined with each other unless
specifically stated otherwise. In any one embodiment described
herein, the fluid may be a gas. The fluid may in particular be air.
The fluid may be supplied by a pressure fluid source which may be a
pump. According to conventional terminology in this field, two
elements are referred to as being "in communication" with each
other when the fluid can flow between the two elements.
[0040] According to embodiments, a seat adjusting device is
provided which uses a 4/4-way control valve. According to
conventional pneumatic nomenclature, the term X/Y-control valve,
with X and Y being integers, refers to a valve which has X ports
and Y positions. Accordingly, a control valve which is configured
as a 4/4-way valve has four ports and four positions. As will be
described in more detail with reference to the drawings, such a
4/4-way valve may be used to selectively inflate or deflate a first
inflatable chamber and a second inflatable chamber. The inflatable
chambers may be resilient bladders or other resilient members which
may be installed in a seat. The inflatable chambers may be
installed such that seat surface contour changes as the inflatable
chamber are inflated or deflated. As will be explained in more
detail below, a great degree of control over the inflatable
chambers may be attained by using a valve module which includes at
least one 4/4-way valve, while keeping the total count of valves
moderate. For illustration, a total of four inflatable chambers
provided in a lumbar support and/or side support region of the seat
may be controlled using two 4/4-way control valves. Two inflatable
chambers may both be inflated and deflated through the same 4/4-way
valve.
[0041] FIG. 1 is a schematic view of a vehicle seat 1 having a seat
adjusting device according to an embodiment. The seat adjusting
device includes inflatable fluid chambers configured as bladders.
Some of the bladders may be such that it may be desirable to
selectively increase, decrease or hold an amount of fluid
introduced thereinto. This may be desirable when the bladder
constitutes a mechanism for adjusting a seat contour over extended
time periods, such as an adjustable lumbar support. Alternatively
or additionally, some of the bladders may be configured such that
the amount of fluid introduced thereinto is increased or decreased
during operation, while the amount of fluid does not need to be
kept constant at a pressure greater than ambient pressure over
extended time period. This may be desirable for bladders
constituting, for example, massage units where pressure in the
bladders is continuously adjusted.
[0042] For illustration rather than limitation, the seat 1 includes
an adjustable lumbar support and an adjustable side support. The
lumbar support includes inflatable fluid chambers, which are
configured as inflatable bladders 2, 3. The bladders 2, 3 are
configured to change their exterior dimensions when a fluid
pressure in the respective bladder is adjusted. Bladders 2, 3 are
provided at a lower portion of the backrest of the vehicle seat 1
and are offset relative to each other in a longitudinal direction
of the backrest. By inflating or deflating all bladders 2, 3, the
amount of curvature in the lower backrest portion may be adjusted.
By inflating one of the bladders 2, 3 while deflating another one,
the apex position may be shifted. Thereby, a four-way lumbar
support device may be implemented. The side support unit includes a
pair of bladders 4, 5 arranged on lateral sides of the seat 1.
While a lumbar support device and side support unit are shown in
FIG. 1, the seat 1 may alternatively or additionally include seat
adjusting devices arranged at other locations. Some of the bladders
2-5 illustrated in FIG. 1 may also be omitted. For illustration,
instead of or in addition to the lumbar support device, bladders
may be provided in the seat part below the user's thighs to provide
massage functions.
[0043] The seat adjusting device further includes a pressure fluid
source 7, a valve module 10, a control circuit 8 and a manual
control device 9. The pressure fluid source 7 is configured to
provide a fluid, in particular a gas, to the valve module 10 at
positive pressure. The pressure fluid source 7 may include a pump
which supplies gas to the valve module 10. The valve module 10 is
configured to receive the gas provided by the pressure fluid source
7 and to supply the gas to bladders installed in the seat 1.
Actuation of the pressure fluid source 7 and of the valve module 10
may be controlled by the control circuit 8 which is electrically
connected to the pressure fluid source 7 and the valve module 10.
Control signals may be generated by the control circuit 8 in
response to an adjustment made at the manual control device 9, for
example. Alternatively, control signals may be generated by the
control circuit 8 in response to a user identification or user
profile received from a vehicular board network.
[0044] The valve module 10 includes a plurality of valves. The
valves may be arranged in a housing of the valve module 10. The
valve module 10 may include at least on control valve configured as
4/4-way valve. The valve module 10 may include at least two 4/4-way
valves 11, 12. In implementations, a 4/4-way valve 11 may be
provided for supplying fluid to a lumbar support bladder and to a
side support bladder. Another 4/4-way valve 12 may be provided for
supplying fluid to another lumbar support bladder and to a side
support bladder. The valve module 10 may optionally include other
control valves or other valves, such as check valves.
[0045] FIG. 2 illustrates a seat adjusting device 19 of an
embodiment in a state in which it is not mounted to the seat 1.
[0046] The configuration of the valve module 10 in seat adjusting
devices according to exemplary embodiments will next be described
with reference to FIG. 3 to FIG. 18.
[0047] FIG. 3 is an exploded perspective view of the valve module
10. The valve module 10 includes a housing having a main housing
portion 22, an end portion 21, and a closure plate 23. The valve
module 10 includes a control valve 40 which is configured as a
4/4-way valve. The valve module 10 may include a second control
valve 60 configured as a 4/4-way valve. The valve module 10 may
include a circuit board 29, to which the control valve 40 and the
second control valve 60 may be attached using fasteners. The
circuit board 29 has connectors for energizing the control valve 40
and the second control valve 60 and/or for supplying power and
control signals to the control valve 40 and the second control
valve 60.
[0048] The control valve 40 has a first port 41, a second port 42,
a third port 43, and a fourth port 44. The first port 41 may be in
communication with a first inflatable chamber, e.g. with a lumbar
support bladder. The second port 42 may be in communication with a
second inflatable chamber, e.g. with a side support bladder. The
third port 43 may be in communication with a fluid supply channel.
The fluid supply channel may be formed by a tube, e.g. a plastic
tube as shown in FIG. 1 and FIG. 2, which connects the pressure
fluid source 7 to a connector 33 associated with the third port 43.
Alternatively or additionally, the fluid supply channel may also
include a section formed within the housing of the valve module.
The fourth port 44 may be in communication with a fluid discharge
opening 34 of the valve module 10. The fourth port 44 may be in
communication with the fluid discharge opening 34 via a fluid
discharge channel 26. The fluid discharge channel 26 may be defined
by the main housing portion 22 and the end plate 23.
[0049] A first connector 31 for attachment of a tube or other fluid
guide may be associated with the first port 41 of the control valve
40. A second connector 32 for attachment of a tube or other fluid
guide may be associated with the second port 42 of the control
valve 40. A fluid channel 25 may be formed in the housing of the
valve module for communication between the second port 42 and the
second connector 32. When the valve module 10 is used in a seat
adjusting device, a first tube may be attached to the first
connector 31 for communication between the first port 41 and the
first inflatable chamber. A second tube may be attached to the
second connector 32 for communication between the second port 42
and the second inflatable chamber. The fluid channel 25, the first
port 41 and the second port 42 may be arranged such that the first
connect- or 31 and the second connector 32 may be provided on the
same side wall 24 of the housing of the valve module 10. The fluid
supply opening 33 may be provided on an opposing side wall of the
housing of the valve module 10. Thereby, the required connections
can be established with moderate overall bending of tubes which
connect the various elements of the seat adjusting device.
[0050] The second control valve 60 which is also a 4/4-way valve
may have the same configuration as the control valve 40. In
particular, the second control valve 60 may have has a first port
61, a second port 62, a third port 63, and a fourth port 64 which
are operative as described with reference to the control valve
40.
[0051] The valve module 10 may include additional elements. For
illustration, a seal member 71 may be provided to establish a
fluid-tight connection between the first port 41 and the first
connector 31. Another seal member 73 may be provided to establish a
fluid-tight connection between the third port 43 and the fluid
supply opening 33. Another seal member 72 may be interposed between
a valve body of the control valve 40 and the main housing portion
22, to provide a fluid-tight connection between the second port 42
and the fluid channel 25 and/or to provide a fluid-tight connection
between the fourth port 44 and the fluid discharge channel 26. A
further seal member 74 may be integrated into the housing of the
valve module 10. One pressure sensor 75 or several pressure sensors
75 may be integrated into the housing of the valve module. A
pressure sensor may be provided in fluid communication with the
first port and/or the second port of at least one control valve for
sensing the pressure in the first inflatable chamber and/or the
second inflatable chamber. The same pressure sensor may be used to
sense pressure at the first port and at the second port, depending
on the position of the control valve. Another pressure sensor may
be provided for sensing a pressure supplied by a fluid pressure
source.
[0052] The first port 41 may be in communication with a first
inflatable chamber, e.g. with a lumbar support bladder. The second
port 42 may be in communication with a second inflatable chamber,
e.g. with a side support bladder. The third port 43 may be in
communication with a fluid supply channel. The fluid supply channel
may be formed by a tube, e.g. a plastic tube as shown in FIG. 1 and
FIG. 2, which connects the pressure fluid source 7 to a connector
33 associated with the third port 43. Alternatively or
additionally, the fluid supply channel may also include a channel
formed within the housing of the valve module 10. The fourth port
44 may be in communication with a fluid discharge opening 34 of the
valve module 10. The fourth port 44 may be in communication with
the fluid discharge opening 34 via a fluid discharge channel 26.
The fluid discharge channel 26 may be defined by the main housing
portion 22 and the end plate 23. A separate fluid supply opening
may be provided for the second control valve 60. In this case, two
separate tubes may be used to supply gas or another working fluid
to the control valve 40 and the second control valve 60. Both tubes
may be connected to the same pump. Alternatively, the third port 43
of the control valve 40 and the third port 63 of the second control
valve 60 may both be in communication with the same fluid supply
opening of the valve module.
[0053] The control valve 40 and the second control valve 60
respectively have four working positions. The operation of the
control valve 40 will be described in more detail below, it being
understood that the second control valve 60 may operate in the same
way and may have the same configuration.
[0054] The control valve 40 has a first position. In the first
position, the first port 41 may be in communication with the third
port 43, while the second port 42 is not in communication with the
third port 43. In the first position, the first port 41 and the
second port 42 may be not in communication with the fourth port 44.
When the control valve 40 is set to the first position and the
pressure fluid source 7 does not supply gas or another working
fluid, the fluid pressure in the first and second inflatable
chambers can be kept constant. When the control valve 40 is set to
the first position and the pressure fluid source 7 is activated,
the first inflatable chamber is inflated while the fluid pressure
in the second inflatable chamber can be kept constant.
[0055] The control valve 40 has a second position. In the second
position, the second port 42 may be in communication with the third
port 43, while the first port 41 is not in communication with the
third port 43. In the second position, the first port 41 and the
second port 42 may be not in communication with the fourth port 44.
When the control valve 40 is set to the second position and the
pressure fluid source 7 does not supply gas or another working
fluid, the fluid pressure in the first and second inflatable
chambers can be kept constant. When the control valve 40 is set to
the second position and the pressure fluid source 7 is activated,
the second inflatable chamber is inflated while the fluid pressure
in the first inflatable chamber can be kept constant.
[0056] The control valve 40 has a third position. In the third
position, the first port 41 may be in communication with the fourth
port 44, while the second port 42 is not in communication with the
fourth port 44. In the third position, the first port 41 and the
second port 42 may be not in communication with the third port 43.
When the control valve 40 is set to the third position, the first
inflatable chamber is deflated, with fluid flowing from the first
port 41 to the fourth port 44 through the control valve 40. When
the control valve 40 is set to the third position, the fluid
pressure in the second inflatable chamber can be kept constant.
[0057] The control valve 40 has a fourth position. In the fourth
position, the second port 42 may be in communication with the
fourth port 44, while the first port 41 is not in communication
with the fourth port 44. In the fourth position, the second port 42
and the first port 41 may be not in communication with the third
port 43. When the control valve 40 is set to the fourth position,
the second inflatable chamber is deflated, with fluid flowing from
the second port 42 to the fourth port 44 through the control valve
40. When the control valve 40 is set to the fourth position, the
fluid pressure in the second inflatable chamber can be kept
constant.
[0058] A check valve or other one-way valve which prevents fluid
from flowing from the first port 43 to the pressure fluid source
may be provided. The one-way valve may be provided within the valve
module 10. The one-way valve may also be provided at another
suitable location. The one-way valve may be integrated into the
pump which supplies gas to the valve module. Thereby, an undesired
deflation of the first and second inflatable chambers can be
prevented when the pressure fluid source 7 is not activated.
Instead of or in addition to a one-way valve, a fluid supply
control valve which may be a 2/2-way valve may be used to
selectively bring the pressure fluid source 7 into communication
with the first port or to terminate this communication.
[0059] Using the control valve 40 with the above configuration and
operation, the following operations can be performed: To maintain
the fluid pressure in the first and second inflatable chambers, the
control valve 40 may be set to the first position while the
pressure fluid source 7 is not activated. To inflate the first
inflatable chamber (e.g. a lumbar support bladder) while
maintaining the fluid pressure in the second inflatable chamber
(e.g. a side support bladder), the control valve 40 may be set to
the first position and the pressure fluid source 7 may be
activated. To inflate the second inflatable chamber while
maintaining the fluid pressure in the first inflatable chamber, the
control valve 40 may be set to the second position and the pressure
fluid source 7 may be activated. To deflate the first inflatable
chamber while maintaining the fluid pressure in the second
inflatable chamber, the control valve 40 may be set to the third
position. To deflate the second inflatable chamber while
maintaining the fluid pressure in the first inflatable chamber the
control valve 40 may be set to the fourth position.
[0060] Various configurations of the control valve 40 may be used
to implement 4/4-way valve functionality. A configuration will be
explained in more detail with reference to FIG. 4 to FIG. 7. The
control valve 40 may include a first solenoid 51 and a second
solenoid 52. By selectively energizing or deenergizing the first
solenoid 51 and the second solenoid 52, a total of four different
valve positions may be realized.
[0061] FIG. 4 to FIG. 7 show cross-sectional views along an axial
direction of the control valve 40. The control valve 40 having this
configuration may be used as control valve in a seat adjusting
device of an embodiment. Generally, the control valve 40 includes a
valve body. A valve body 50 which may be formed from plastic or
from metal may extend along the axial direction of the control
valve 40. The first solenoid 51 and the second solenoid 52 may be
arranged on the valve body 50. The first solenoid 51 and the second
solenoid 52 may be wound around the valve body 50. The control
valve 40 has an internal channel 59. The internal channel 59 may be
formed in the valve body 50.
[0062] The control valve 40 may have a first element 53 which is
displaceable under the action of the first solenoid 51. The first
element 53 may be a first armature. The first element 53 may
comprise or may be formed from a magnetic material, e.g. from a
paramagnetic or ferromagnetic material. The first element 53 may be
biased by a first bias means 55. The first bias means 55 may be a
first spring. The first element 53 may selectively engage a first
sealing area 45 associated with the first port 41 or a second
sealing area 46 associated with the second port 42. When the first
solenoid 51 is deenergized, the first bias means 55 forces the
first element 53 against the second sealing area 46. Thereby,
communication between the internal channel 59 and the second port
42 is interrupted, while the first port 41 communicates with the
internal channel 59. When the first solenoid 51 is energized, the
first element 53 is displaced against the force of the first bias
means 55, is engaged with the first sealing area 45 and disengages
from the second sealing area 46. Thereby, communication between the
internal channel 59 and the second port 42 is established, while
communication between the first port 41 and the internal channel 59
is interrupted. The first element 53 may have a first head at a
first axial end for engaging the first sealing area 45. The first
element 53 may have a second head at a second axial end for
engaging the second sealing area 46. The first and second sealing
areas 45, 46 may respectively include a projection which extends
circumferentially about the respective valve port.
[0063] The control valve may have a second element 54 which is
displaceable under the action of the second solenoid 52. The second
element 54 may be a second armature. The second element 54 may
comprise or may be formed from a magnetic material, e.g. from a
paramagnetic or ferromagnetic material. The second element 54 may
be biased by a second bias means 56. The second bias means 56 may
be a second spring. The second element 54 may selectively engage a
third sealing area 47 associated with the third port 43 or a fourth
sealing area 48 associated with the fourth port 44. When the second
solenoid 52 is deenergized, the second bias means 56 forces the
second element 54 against the fourth sealing area 48, while the
second element 54 is disengaged from the third sealing area 47.
Thereby, communication between the internal channel 59 and the
fourth port 44 is interrupted, while the third port 43 communicates
with the internal channel 59. When the second solenoid 52 is
energized, the second element 54 is displaced against the force of
the second bias means 56, is engaged with the third sealing area 47
and disengages from the fourth sealing area 48. Thereby,
communication between the internal channel 59 and the fourth port
44 is established, while communication between the third port 43
and the internal channel 59 is interrupted. The second element 54
may have a first head at a first axial end for engaging the third
sealing area 47. The second element 54 may have a second head at a
second axial end for engaging the fourth sealing area 48. The third
and fourth sealing areas 47, 48 may respectively include a
projection which extends circumferentially about an inner end of
the respective valve port.
[0064] In the control valve 40 having such a configuration, the
first solenoid 51 is operative to select one of the first port 41
and the second port 42 for an inflation or deflation operation. The
second solenoid 52 is operative to select between a communication
with the third port 43 for inflation (pressure fluid source 7
activated) or maintaining pressure (pressure fluid source 7 not
activated) and a communication with the fourth port 44 for
deflation. The second solenoid 52, associated armature 54 and
arrangement of the third port 43 and fourth port 44 may be selected
such that communication with the fourth port 44 for deflation is
established only when the second solenoid 52 is energized.
[0065] FIG. 4 shows the control valve 40 when the first solenoid 51
and the second solenoid 52 are deenergized. This corresponds to the
first position of the control valve 40. The first port 41 is in
communication with the third port 43 but not with the fourth port
44, while the second port 42 is not in communication with the third
port 43 and is not in communication with the fourth port 44. FIG. 5
shows the control valve 40 when the first solenoid 51 is energized
and the second solenoid 52 is deenergized. This corresponds to the
second position of the control valve 40. The second port 42 is in
communication with the third port 43 but not with the fourth port
44, while the first port 41 is not in communication with the third
port 43 and is not in communication with the fourth port 44. FIG. 7
shows the control valve 40 when the first solenoid 51 is
deenergized and the second solenoid 52 is energized. This
corresponds to the third position of the control valve 40. The
first port 41 is in communication with the fourth port 44 but not
with the third port 43, while the second port 42 is not in
communication with the third port 43 and is not in communication
with the fourth port 44. FIG. 6 shows the control valve 40 when the
first solenoid 51 is energized and the second solenoid 52 is
energized. This corresponds to the fourth position of the control
valve 40. The second port 42 is in communication with the fourth
port 44 but not with the third port 43, while the first port 41 is
not in communication with the third port 43 and is not in
communication with the fourth port 44.
[0066] While the operation and a configuration of the control valve
40 of an exemplary embodiment were described in detail, the second
control valve 60 may have an identical operation and configuration.
It will be appreciated that the seat adjusting device which
includes the valve module 10 also allows both side support bladders
to be inflated simultaneously via the control valve 40 and the
second control valve 60, with each one of the control valve 40 and
the second control valve 60 supplying gas or another working fluid
to an associated side support bladder. Alternatively or
additionally, the seat adjusting device which includes the valve
module 10 also allows both lumbar support bladders to be inflated
simultaneously via the control valve 40 and the second control
valve 60, with each one of the control valve 40 and the second
control valve 60 supplying gas or another working fluid to an
associated lumbar support bladder. Fluid exchange between
inflatable chambers may be prevented.
[0067] Additional valves may be used in the seat adjusting device
to provide even further enhanced levels of control. For
illustration, at least one 2/2-way control valve may be integrated
into the valve module. The 2/2-way control valve may be connected
to a fluid supply channel or a fluid discharge channel of at least
one of the control valve 40 and the second control valve 60. By
using such a 2/2-way control valve, individual control of the
various inflatable chambers may be enhanced.
[0068] It is also possible to use a valve module having just one
4/4-way valve, or to otherwise use a 4/4-way valve for controlling
the fluid in an inflatable chamber. For illustration, a pressure
fluid source may be connected to one port of the 4/4-way valve. An
inflatable chamber may be connected to another port of the 4/4-way
valve. The inflatable chamber may be integrated into a side
bolster, for example.
[0069] FIG. 8 is an exploded perspective view of a valve module 10
which may be used in a seat adjusting device of another embodiment.
The valve module 10 includes at least one 4/4-way control valve.
The valve module 10 may include a control valve 40 and second
control valve 60 configured as explained with reference to FIG. 3
to FIG. 7.
[0070] The valve module 10 includes a first additional control
valve 81 which may be a 2/2-way control valve. The first additional
control valve 81 may be connected between a third port of one of
the 4/4-way control valves 40, 60 and a fluid supply opening of the
valve module 10. The first additional control valve 81 may be
connected between a fourth port of one of the 4/4-way control
valves 40, 60 and a fluid discharge opening of the valve module 10.
The second additional control valve 82 may be connected between a
third port of the other one of the 4/4-way control valves 40, 60
and a fluid supply opening of the valve module 10. The second
additional control valve 82 may be connected between a fourth port
of the other one of the 4/4-way control valves 40, 60 and a fluid
discharge opening of the valve module 10. Communication between
ports of the additional control valve(s) 81, 82 and ports of the
4/4-way control valves 40, 60 may be established by channels formed
by the housing of the valve module 10. For illustration, a surface
83 of the main housing portion 22 which faces the end plate 23 may
have concavities to define channels which connect ports of the
additional control valve(s) 81, 82 and ports of the 4/4-way control
valves 40, 60.
[0071] FIG. 9 is an exploded perspective view of a valve module 10
which may be used in a seat adjusting device of another embodiment.
The valve module 10 includes at least one 4/4-way control valve.
The valve module 10 may include a control valve 140 which is a
4/4-way control valve. The valve module 10 may include a second
control valve 160 which is a 4/4-way control valve. The positions
and operation of the control valve 140 and the second control valve
160 are similar to the ones of the control valve 40 and will be
explained in more detail below.
[0072] The valve module 10 includes a first fluid supply control
valve 101. The first fluid supply control valve 101 may be a
2/2-way valve. The first fluid supply control valve 101 may be
operative to control fluid flow from the pressure fluid source 7 to
the control valve 140. The valve module 10 includes a second fluid
supply control valve 102. The second fluid supply control valve 102
may be a 2/2-way valve. The second fluid supply control valve 102
may be operative to control fluid flow from the pressure fluid
source 7 to the second control valve 160. The first fluid supply
control valve 101, the second fluid supply control valve 102, the
control valve 140 and the second control valve 160 may be attached
to the circuit board 29. Control of the first fluid supply control
valve 101, the second fluid supply control valve 102, the control
valve 140 and the second control valve 160 may be attained by
electrical signals and/or electrical power supply through the
circuit board 29.
[0073] The housing of the valve module 10 may define a fluid supply
channel for establishing fluid communication between an outlet port
of the first fluid supply control valve 101 and a third port 143 of
the control valve 140. The housing of the valve module 10 may
define a fluid supply channel for establishing fluid communication
between an outlet port of the second fluid supply control valve 102
and a third port of the second control valve 160. To this end, a
surface 91 of the main housing portion 22 which faces the end plate
23 may have recesses that define channels. The channels may also
establish fluid communication between a fluid supply opening 93 of
the valve module and an inlet port of the first and second fluid
supply control valves 101, 102. The surface 91 of the main housing
portion 22 may also have one or several discharge openings 94 for
passage of fluid that is discharged. A configuration of channels in
one implementation is explained in more detail with reference to
FIG. 10.
[0074] FIG. 10 shows a plan view of the surface 91 of the main
housing portion 22. The surface 91 may include a recess 95 which
defines a channel through which fluid received at the fluid supply
opening 93 is guided to the inlet port of the first and second
fluid supply control valves 101, 102. The surface 91 may include a
recess 96 which defines a channel through which gas can flow from
the outlet port of the first fluid supply control valve 101 to the
third port of the control valve 140. The surface 91 may include a
recess 97 which defines a channel through which gas can flow from
the outlet port of the second fluid supply control valve 102 to the
third port of the second control valve 160. Additional channels may
be incorporated into the housing of the valve module. For
illustration, a recess 92 formed in the surface 91 may define a
channel through which fluid can flow between a second port of the
control valve 140 and the second connector 32, for inflation or
deflation of the second inflatable chamber. For further
illustration, a recess 98 may be formed in the surface 91 through
which gas discharged from a fourth port of the control valve 140
may flow to a discharge opening 94.
[0075] Operation of the control valve 140 and the second control
valve 160 and a configuration of the control valve 140 and the
second control valve 160 will be explained in more detail next.
[0076] The control valve 140 has a first position as shown in FIG.
11. In the first position, the first port 141 may be in
communication with the third port 143, while the second port 142 is
not in communication with the third port 143. In the first
position, the first port 141 and the second port 142 may be not in
communication with the fourth port 144. When the control valve 140
is set to the first position and the first fluid supply control
valve 101 is in a closed state in which it does not pass gas or
another working fluid to the third port 143, the fluid pressure in
the first and second inflatable chambers can be kept constant. When
the control valve 140 is set to the first position, the pressure
fluid source 7 is activated, and the first fluid supply control
valve 101 is set to an open state in which it passes fluid received
from the pressure fluid source 7 at the input port 103 to the
output port 104, the first inflatable chamber is inflated while the
fluid pressure in the second inflatable chamber can be kept
constant.
[0077] The control valve 140 has a second position as shown in FIG.
12. In the second position, the second port 142 may be in
communication with the third port 143, while the first port 141 is
not in communication with the third port 143. In the second
position, the first port 141 and the second port 142 may be not in
communication with the fourth port 144. When the control valve 140
is set to the second position and the first fluid supply control
valve 101 is set to the closed state in which it does no pass gas
or another working fluid to the third port 143, the fluid pressure
in the first and second inflatable chambers can be kept constant.
When the control valve 140 is set to the first position, the
pressure fluid source 7 is activated, and the first fluid supply
control valve 101 is set to the open state in which it passes fluid
received from the pressure fluid source 7 at the input port 103 to
the output port 104, the second inflatable chamber is inflated
while the fluid pressure in the first inflatable chamber can be
kept constant.
[0078] The control valve 140 has a third position as shown in FIG.
13. In the third position, the first port 141 may be in
communication with the fourth port 144, while the second port 142
is not in communication with the fourth port 144. It is not
required that, when the control valve 140 is in the third position,
the first port 141 and the second port 142 are disconnected from
the third port 143, because discharge of fluid towards the pressure
fluid source may be prevented by setting the first fluid supply
control valve 101 to the closed state in which gas is prevented
from flowing between the input port 103 and the output port 104.
When the control valve 140 is set to the third position, the first
inflatable chamber is deflated, with fluid flowing from the first
port 141 to the fourth port 144 through the control valve 140. When
the control valve 140 is set to the third position, the fluid
pressure in the second inflatable chamber can be kept constant.
[0079] The control valve 140 has a fourth position as shown in FIG.
14. In the fourth position, the second port 142 may be in
communication with the fourth port 144, while the first port 141 is
not in communication with the fourth port 144. It is not required
that, when the control valve 140 is in the fourth position, the
first port 141 and the second port 142 are disconnected from the
third port 143, because discharge of fluid towards the pressure
fluid source may be prevented by setting the first fluid supply
control valve 101 to the closed state. When the control valve 140
is set to the fourth position, the second inflatable chamber is
deflated, with fluid flowing from the second port 142 to the fourth
port 144 through the control valve 140. When the control valve 140
is set to the fourth position, the fluid pressure in the first
inflatable chamber can be kept constant.
[0080] The operation and configuration of the second control valve
160 and associated second fluid supply control valve 102 may be the
same as that of the control valve 140 and associated first fluid
supply control valve 101.
[0081] Since the fluid supply control valves 101, 102 can be used
to selectively pass fluid to the control valve 140 and/or the
second control valve 160, no separate check valve must be provided
to prevent fluid from flowing through the third port 143 of the
control valve 140 towards the pressure fluid source 7. Rather,
setting the fluid supply control valve 101 or 102 to the closed
state may prevent undesired deflation.
[0082] The control valve 140 may include a first solenoid 51 to
displace a first armature 53 and a second solenoid 52 to displace a
second armature 54, similarly to the configuration of the control
valve 40. By selectively energizing or deenergizing the first
solenoid 51 and the second solenoid 52, a total of four different
valve positions may be realized.
[0083] FIG. 11 to FIG. 14 show cross-sectional view along an axial
direction of the control valve 140. The control valve 140 having
this configuration may be used as control valve in a seat adjusting
device of an embodiment. Generally, the control valve 140 includes
a valve body. A valve body 50 which may be formed from plastic or
from metal may extend along the axial direction of the control
valve 140. The first solenoid 51 and the second solenoid 52 may be
arranged on the valve body 50. The first solenoid 51 and the second
solenoid 52 may be wound around the valve body 50. The control
valve 140 has an internal channel 59. The internal channel 59 may
be formed in the valve body 50.
[0084] The control valve 140 may have a first element 53 which is
displaceable under the action of the first solenoid 51. The
operation and configuration of the first solenoid 51 and first
element 53 may be as described with reference to FIG. 4 to FIG. 7.
In particular, by energizing or deenergizing the first solenoid 51,
one of the first inflatable chamber connected to the first port 141
or the second inflatable chamber connected to the second port 142
may be selected for inflation or deflation. The control valve 140
may have a second element 54 which is displaceable under the action
of the second solenoid 52. The second element 54 may be an
armature. A bias means 56, which may be a spring, may bias the
second element 54 against a fourth sealing area 48. When the second
solenoid 52 is energized, the second element 54 is displaced
against the force of the bias means 56 to establish a communication
between the fourth port 144 and one of the first and second ports
141, 142. It is not required to selectively open or close the third
port 143. Fluid flow from the pressure fluid source 7 may be
allowed using the fluid supply control valve 101, and fluid flow
towards the pressure fluid source 7 may be suppressed by setting
the fluid supply control valve 101 to the closed state.
[0085] In the control valve 140 having such a configuration, the
first solenoid 51 is operative to select one of the first port 141
and the second port 142 for an inflation or deflation operation.
The second solenoid 52 is operative to select between a
communication with the third port 143 for inflation (pressure fluid
source 7 activated and first fluid supply control valve 101 set to
the open state) or maintaining pressure (pressure fluid source 7
not activated and/or first fluid supply control valve 102 set to
the closed state) and a communication with the fourth port 144 for
deflation.
[0086] FIG. 11 shows the control valve 140 when the first solenoid
51 and the second solenoid 52 are deenergized. This corresponds to
the first position of the control valve 140. The first port 141 is
in communication with the third port 143 but not with the fourth
port 144, while the second port 142 is not in communication with
the third port 143 and is not in communication with the fourth port
144. FIG. 12 shows the control valve 140 when the first solenoid 51
is energized and the second solenoid 52 is deenergized. This
corresponds to the second position of the control valve 140. The
second port 142 is in communication with the third port 143 but not
with the fourth port 144, while the first port 141 is not in
communication with the third port 143 and is not in communication
with the fourth port 144. FIG. 13 shows the control valve 140 when
the first solenoid 51 is deenergized and the second solenoid 52 is
energized. This corresponds to the third position of the control
valve 140. The first port 141 is in communication with the fourth
port 144, while the second port 142 is not in communication with
the third port 143 and is not in communication with the fourth port
144. FIG. 14 shows the control valve 140 when the first solenoid 51
is energized and the second solenoid 52 is energized. This
corresponds to the fourth position of the control valve 140. The
second port 142 is in communication with the fourth port 144, while
the first port 141 is not in communication with the third port 143
and is not in communication with the fourth port 144.
[0087] The first fluid supply control valve 101 and the second
fluid supply control valve 102 may be combined into one
constructional unit. One possible configuration of the first fluid
supply control valve 101 and the second fluid supply control valve
102 is illustrated in FIG. 15 to FIG. 18 which show a
cross-sectional view through the pair of fluid supply control
valves 101, 102. The outer dimensions of the pair of fluid supply
control valves 101, 102 may match the outer dimensions of the
control valve 140 and with the outer dimensions of the second
control valve 160. Further, the relative positions of the inlet
port 103 of the fluid supply control valves 101, 102, of the outlet
port 104 of the first fluid supply control valve 101 and of the
outlet port 105 of the second fluid supply control valve 102 may be
the same as the relative positions of the third port 143, fourth
port 144 and second port 142 on the control valve 140 and the
second control valve 160. Thereby, modular assembly and combination
into different valve modules is enhanced.
[0088] The first fluid supply control valve 101 and the second
fluid supply control valve 102 may be actuated independently from
each other. The first fluid supply control valve 101 may include a
first solenoid 111. A first bias means 115 may bias a first element
113 against a first sealing area 106. The first element 113 may be
a first armature and may be formed from magnetic material, e.g.
from paramagnetic or ferromagnetic material. In this deenergized
condition of the first solenoid 111, there is no fluid
communication between the inlet port 103 and the outlet port 104 of
the first fluid supply control valve 101. When the first solenoid
111 is energized, the first element 113 is displaced against the
force of the first bias means 115 and disengages from the first
sealing area 106. Thereby, communication is established between the
inlet port 103 and the outlet port 104.
[0089] The second fluid supply control valve 102 may have a
corresponding configuration. The second fluid supply control valve
102 may include a second solenoid 112. A second bias means 116 may
bias a second element 114 against a second sealing area 107. The
second element 114 may be a second armature and may be formed from
magnetic material, e.g. from paramagnetic or ferromagnetic
material. In this deenergized condition of the second solenoid 112,
there is no fluid communication between the inlet port 103 and the
outlet port 105 of the second fluid supply control valve 102. When
the second solenoid 112 is energized, the second element 114 is
displaced against the force of the second bias means 116 and
disengages from the second sealing area 107. Thereby, communication
is established between the inlet port 103 and the outlet port
105.
[0090] The first fluid supply control valve 101 and the second
fluid supply control valve 102 can be controlled by energizing or
deenergizing the first solenoid 111 and second solenoid 112. The
first fluid supply control valve 101 and the second fluid supply
control valve 102 may be controlled to selectively pass gas or
another working fluid to the control valve 140 and/or to the second
control valve 160. In combination with control of the control valve
140 and/or the second control valve 160, it is possible to
individually address each one of four inflatable fluid chambers
such that each inflatable fluid chamber can be individually
inflated or deflated. For illustration, by energizing the first
solenoid 111 of the first fluid supply control valve 101, gas or
another working fluid can be passed to the control valve 140. By
energizing or deenergizing the first solenoid 51 of the control
valve 140, either the first inflatable chamber communicating with
the first port 141 or the second inflatable chamber communicating
with the second port 142 can be inflated. Similarly, by energizing
the second solenoid 112 of the second fluid supply control valve
102, gas or another working fluid can be passed to the second
control valve 160. By energizing or deenergizing the first solenoid
of the second control valve 160, either the inflatable chamber
communicating with the first port or the inflatable chamber
communicating with the second port of the second control valve 160
can be inflated.
[0091] FIG. 15 to FIG. 18 show different states of the pair of the
first fluid supply control valve 101 and the second fluid supply
control valve 102. FIG. 15 shows a state in which the first fluid
supply control valve 101 and the second fluid supply control valve
102 are closed. Such a state can be attained by deenergizing the
first solenoid 111 of the first fluid supply control valve 101 and
the second solenoid 112 of the second fluid supply control valve
102. Such a state may be used when none of the inflatable chambers
of the seat adjusting device is to be inflated. FIG. 16 shows a
state in which the first fluid supply control valve 101 is open
such that the inlet port 103 communicates with the outlet port 104,
and the second fluid supply control valve 102 is closed. Such a
state can be attained by energizing the first solenoid 111 of the
first fluid supply control valve 101 and deenergizing the second
solenoid 112 of the second fluid supply control valve 102. Such a
state may be used when one of the inflatable chambers which is in
communication with the control valve 140 is to be inflated. FIG. 17
shows a state in which the first fluid supply control valve 101 is
closed and the second fluid supply control valve 102 is open, such
that the inlet port 103 communicates with the outlet port 105. Such
a state can be attained by deenergizing the first solenoid 111 of
the first fluid supply control valve 101 and energizing the second
solenoid 112 of the second fluid supply control valve 102. Such a
state may be used when one of the inflatable chambers which is in
communication with the second control valve 160 is to be inflated.
FIG. 18 shows a state in which the first fluid supply control valve
101 and the second fluid supply control valve 102 are open, such
that the inlet port 103 communicates with the outlet port 104 and
with the outlet port 105. Such a state can be attained by
energizing the first solenoid 111 of the first fluid supply control
valve 101 and the second solenoid 112 of the second fluid supply
control valve 102. Such a state may be used when one of the
inflatable chambers which is in communication with the control
valve 140 is to be inflated and one of the inflatable chambers
which is in communication with the second control valve 160 is to
be inflated at the same time.
[0092] Seat adjusting devices according to embodiments have been
described. Other configurations may be implemented in other
embodiments. For illustration, while electromagnetic actuators
having a solenoid and a bias spring have been described, other
electromagnetic actuators may be used.
[0093] The seat adjusting devices of embodiments include a valve
module that has a modular configuration which allows different
types of valves to be combined in a flexible manner. While a valve
module including two 4/4-way control valves has been described, the
valve module may combine at least one 4/4-way control valve with
other types of valves.
[0094] Additional elements or features may be used in seat
adjusting devices of embodiments. For illustration, noise damper
elements may be integrated into the housing of the valve module.
While a valve module having integrated pressure sensors has been
described, the pressure sensor(s) may also be omitted from the
valve module and/or may be provided separately.
[0095] While embodiments have been described in which a 4/4-way
control valve includes two different displaceable elements which
are independently controlled by two separate solenoids, other
configurations for the 4/4-way control valve may be used in other
embodiments. For illustration, there may be only one displaceable
element which is displaced to four different positions to implement
4/4-way control valve operation. For further illustration, while
embodiments have been described in detail in which the 4/4-way
valve is formed as an integral unit, a 4/4-way valve functionality
can also be realized by appropriately combining other valves such
that the resultant control valve has four ports and four working
positions.
[0096] While exemplary embodiments have been described in which a
valve module may include two or more 4/4-way control valves, the
valve module may include only one 4/4-way control valve. A pressure
fluid source may be connected through a check valve to one of the
ports of the 4/4-way control valve. Another port may be connected
to an inflatable chamber. The check valve may also be integrated
into a port of the 4/4-way control valve.
[0097] While exemplary embodiments have been described in the
context of lumbar support adjustment and side support adjustment,
embodiments may also be configured to only provide lumbar support
adjustment or to only provide side support adjustment or to provide
still other kinds of seat adjustment. For illustration, in other
embodiments, pneumatic massage units may alternatively or
additionally also be controlled using a 4/4-way control valve.
[0098] Various effects can be attained using seat adjusting devices
of embodiments. For illustration, a total of four inflatable fluid
chambers can be controlled using two 4/4-way control valves. The
states of up to four inflatable chambers may be mapped with memory
or without memory. No energy needs to be supplied to the 4/4-way
control valves as long as no inflation or deflation operation takes
place. Fluid exchange between inflatable chambers may be suppressed
when using different 4/4-way control valves to inflate or deflate
two different side support chambers or other inflatable
chambers.
[0099] Embodiments of the invention may be used to supply fluid to
various types of support bladders in a wide variety of seats. The
embodiments may in particular be used for seat adjustment of
vehicle seats, such as automotive vehicle seats, without being
limited thereto.
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