U.S. patent application number 11/156904 was filed with the patent office on 2005-10-20 for device for adjusting the phase position between the camshaft and the crankshaft.
This patent application is currently assigned to AFT Atlas Fahrzeugtechnik GmbH. Invention is credited to Axmacher, Detlef, Gasparro, Massimiliano, Neubauer, Dirk, Pachan, Frank, Pfutzenreuter, Lars, Wilke, Markus.
Application Number | 20050229881 11/156904 |
Document ID | / |
Family ID | 32519045 |
Filed Date | 2005-10-20 |
United States Patent
Application |
20050229881 |
Kind Code |
A1 |
Neubauer, Dirk ; et
al. |
October 20, 2005 |
Device for adjusting the phase position between the camshaft and
the crankshaft
Abstract
A device for adjusting the phase position between a camshaft and
a crankshaft is provided. A quick and precise electronic adjustment
for mechanical adjustment devices for adjusting the phase position
between a camshaft and a crankshaft have previously not been known.
The adjustment device is a component of an electronic circuit,
either automatically adjusting the desired phase position directly
or indirectly via another parameter, with the circuit including at
least one loop between the control device and the adjustment path,
by which a quick and precise adjustment can be achieved. Such
arrangements are needed for a quick and precise adjustment of the
phase position of a camshaft in reference to a crankshaft in
internal combustion engines.
Inventors: |
Neubauer, Dirk;
(Nachrodt-Wiblingwerde, DE) ; Axmacher, Detlef;
(Iserlohn, DE) ; Wilke, Markus; (Nurtingen,
DE) ; Gasparro, Massimiliano; (Halver, DE) ;
Pachan, Frank; (Dortmund, DE) ; Pfutzenreuter,
Lars; (Werdohl, DE) |
Correspondence
Address: |
VOLPE AND KOENIG, P.C.
UNITED PLAZA, SUITE 1600
30 SOUTH 17TH STREET
PHILADELPHIA
PA
19103
US
|
Assignee: |
AFT Atlas Fahrzeugtechnik
GmbH
Werdohl
DE
|
Family ID: |
32519045 |
Appl. No.: |
11/156904 |
Filed: |
June 20, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
11156904 |
Jun 20, 2005 |
|
|
|
PCT/DE03/03620 |
Oct 31, 2003 |
|
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Current U.S.
Class: |
123/90.15 |
Current CPC
Class: |
F02D 2041/1409 20130101;
F01L 2800/00 20130101; F02D 2041/1419 20130101; F01L 2201/00
20130101; F01L 1/34 20130101; F01L 1/352 20130101 |
Class at
Publication: |
123/090.15 |
International
Class: |
F01L 001/34 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 18, 2002 |
DE |
102 59 134.2 |
Claims
1. An electronically driven mechanical adjustment device for
adjusting a phase position (.phi.) between a camshaft and a
crankshaft, comprising an adjuster that is part of an electronic
circuit, for automatically adjusting a desired phase position
(.phi.) between the camshaft and the crankshaft, and the circuit
including at least one loop, in which an output value is fed back
to the input.
2. An adjustment device according to claim 1, wherein the
electronic circuit includes a compensation for variable
disturbances (2).
3. An adjustment device according to claim 1, wherein the
electronic circuit includes several control loops, nested parallel
in a cascading fashion, with at least one circuit being
superordinate to another one.
4. Control device according to claim 1, wherein the circuit in
which the adjustment device is arranged includes a state control
(10, 11).
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of PCT/DE2003/003620,
filed Oct. 31, 2003, which is incorporated herein by reference as
if fully set forth.
BACKGROUND
[0002] The invention relates to a device for adjusting the phase
position between a camshaft and a crankshaft of an internal
combustion engine.
[0003] In internal combustion engines, the crankshaft drives one or
more camshafts via a primary drive, provided, for example, as a
toothed belt. For this purpose, a camshaft timing gear is mounted
to each camshaft, by which the primary drive drives the camshaft.
Here, at any time a transmission of the angle of rotation of the
crankshaft occurs, in which a 720.degree. angle of rotation of the
crankshaft .phi..sub.K is transmitted into a 360.degree. angle of
rotation of the camshaft .phi..sub.N. Therefore, through this
coupling the two angles of rotation are constant in reference to
one another. In most applications, this fixed coupling of
crankshaft and camshaft results in a ratio of 1 N ( t ) K ( t ) = 1
2
[0004] However, the operational characteristics of an internal
combustion engine can be optimized, particularly with regard of
fuel consumption, exhaust emission, and running performance, when
the system of camshaft and crankshaft, coupled via the primary
drive, can be modified.
[0005] DE 100 38 354 A1 discloses an arrangement for adjusting the
angle of rotation of a camshaft relative to a crankshaft using a
wobble plate mechanism. Here, a second drive additionally acts on
the camshaft via a wobble plate mechanism, which is arranged
between the camshaft phasing gear and the camshaft. This causes the
camshaft to be adjustable relative to the crankshaft.
SUMMARY
[0006] The objective of the invention is to provide a simple and
cost effective adjustment device, by which the phase position
between the camshaft and the crankshaft can be adjusted.
[0007] This objective is attained according to the invention. Here,
the adjustment device is a component of an electronic circuit
automatically adjusting the desired phase position either directly
or indirectly via another parameter, with the circuit comprising a
control device and a control path having a structure specified for
that application.
[0008] The advantage of the invention lies in the fact that such an
adjustment device, having such an electronic circuit, can adjust
very quickly and precisely the desired value in the control
path.
[0009] Advantageous further developments also result from the
invention as further described below. Here, for example, the target
value can be adjusted with the adjustment device even more quickly
and more precisely by way of compensating variable disturbances, or
by adjusting a cascading positioning or by way of a state
control.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In the following, the invention will be explained in greater
detail using three exemplary embodiments shown in the figures. In
the drawings:
[0011] FIG. 1 is a schematic view of an adjustment device having a
compensation for variable disturbances according to the
invention.
[0012] FIG. 2 is a schematic view of an adjustment device having a
cascading positioning adjustment in accordance with another
embodiment of the invention.
[0013] FIG. 3 is a schematic view of an adjustment device having an
optimized state control in accordance with another embodiment of
the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0014] FIG. 1 shows an adjustment device provided with a
positioning control 1 having a compensation for variable
disturbances 2. In state of the art mechanical phase adjustment
devices, driven by electric motors, such as e.g., the ones known
from DE 100 38 354 A1, the relative rotational speed of the
electric motor is equivalent to the rotational speed of the
sprocket or the belt pulley coupling the crankshaft with the
camshaft, when the phase position remains unchanged. During the
phase adjustment the relative rotational speed of the electric
motor is faster or slower than the speed of the sprocket depending
on the direction of the adjustment.
[0015] In the present exemplary embodiment the effect of the
variable disturbance of the crank shaft rotational speed z is not
collected only when it effects the control variable, but is already
used for the pre-adjustment of the adjustment member 3. For
example, the rotational speed of the sprocket or the belt pulley
can be determined from the rotational speed of the crankshaft. The
rotational speed z can be related to a corresponding self-inducting
voltage y.sub.R at the electric motor.
[0016] In FIG. 1, the target value w, in the exemplary embodiment
the desired phase position, is entered into the control 4. The
target value w acts on the electric motor of the adjustment member
in the control path 3, e.g., a wobble plate mechanism. This causes
the rotational speed of the sprocket or the belt pulley to change,
resulting in a modified phase position. The actual value x of the
phase position and/or the rotational speed of the sprocket or the
belt pulley is fed back. The returned actual value determines the
new target value for the control. This new target value is then fed
to the control. The compensation for variable disturbances 2 is
formed such that, additionally, from the rotational speed of the
crankshaft z the self-induction voltage y.sub.z is determined as an
additional adjustment parameter for the electric motor of the
adjustment member, also determining the rotational speed of the
electric motor.
[0017] FIG. 2 shows an adjustment device having a cascading
positioning control. In order to improve the adjustment times and
to achieve higher dynamics in the circuit, here, several circuits
are nested parallel to one another. Here, disturbances are
compensated in the subordinate circuits, before they can have any
effect on the superordinate circuits. In the present exemplary
embodiment, the positioning control, provided with a positioning
return, is provided with a subordinate rotational speed control of
the electric motor, which is provided with a feed back of the
angular speed. Here, the rotational speed and/or the angular speed
of the electric motor can be determined in the form of a
measurement or can be calculated indirectly via the trigger
information of the camshaft and the crankshaft. Furthermore, the
rotational speed control is cascaded by a control of the armature
current, in which an additional compensation control can improve
the dynamics. The control of the armature current and/or the
measurement of the armature current can also occur via a
measurement of the torque of the electric motor driving the
adjustment device. In this exemplary embodiment, a target rotation
angle .phi.s is given, describing the position and/or phase
position between the camshaft and the crankshaft. Depending on the
angle .phi.s the rotational speed and/or the angular speed .omega.s
is given for the electric motor. The angular speed itself is
determined by the torque of the electric motor. The torque M.sub.L
and/or the corresponding current is measured and returned and here
compared with the corresponding target value Ms. When the values do
not coincide, appropriate readjustments are made. Simultaneously
the superordinate actual value .omega. of the angular speed is
measured and subsequently returned for comparison to its target
value .omega.s. In the event of any discrepancies, here too
appropriate readjustments are made. Finally, the actual phase
position .phi. is determined as well, returned, and adjusted to the
target value .phi.s.
[0018] FIG. 3 shows an adjustment device having a state control.
Through the use of the state control, the dynamics of the control
system are largely determined, because the conditions determining
the dynamics directly enter the control. If the condition to be
determined cannot be measured directly, it may be calculated by way
of a state observer and/or a state equation.
[0019] Here, a time controlled input value w(t) is entered in to a
pre-filter 5. The pre-filter generates an output value u.sub.w(t)
therefrom, which forms together with a value u.sub.r(t) created by
a state control 6 an input value u(t) for the state differential
equation 7. Furthermore, the actual value x(t.sub.0) at the time to
is fed to the state differential equation 7. Using these values the
state differential equation 7 calculates the state x(t). The state
can be measured either directly or indirectly via a measuring
device 8, with the measurement being able to influence the state
control 6, which again influences the input value u(t) for the
state differential equation 7. Additionally, the actual value x(t)
can be fed to the output equation 9 for further processing, which
then creates an output value y(t) for the control path 10. In the
circuit shown, the control path 10 is formed by the state
differential equation 7 and the output equation 9, which create the
variable control. The control device 11, controlling the variable
control, is essentially formed by the measuring device 8 and the
state control 6. In the exemplary embodiment the control device 11
also includes the pre-filter 5.
[0020] All exemplary embodiments may be combined with one another
in various ways depending on the particular application.
* * * * *