U.S. patent application number 11/784108 was filed with the patent office on 2007-10-11 for heating and cooling device.
This patent application is currently assigned to DENSO Corporation. Invention is credited to Shinji Aoki, Yuji Ito.
Application Number | 20070234742 11/784108 |
Document ID | / |
Family ID | 38573662 |
Filed Date | 2007-10-11 |
United States Patent
Application |
20070234742 |
Kind Code |
A1 |
Aoki; Shinji ; et
al. |
October 11, 2007 |
Heating and cooling device
Abstract
A heating and cooling device includes a case having an air
passage, a blower for sending air to the air passage, a
thermoelectric conversion element and a controller. The
thermoelectric conversion element is disposed in the case, and has
a heat-absorbing part and a heat-emitting part, which are switched
based on a current direction. The thermoelectric conversion element
heats or cools air sent by the blower by switching the current
direction. The controller stops electricity supplied to the
thermoelectric conversion element, when air sent by the blower
toward the thermoelectric conversion element is stopped while the
thermoelectric conversion element is supplied with electricity.
Inventors: |
Aoki; Shinji; (Chiryu-city,
JP) ; Ito; Yuji; (Okazaki-city, JP) |
Correspondence
Address: |
HARNESS, DICKEY & PIERCE, P.L.C.
P.O. BOX 828
BLOOMFIELD HILLS
MI
48303
US
|
Assignee: |
DENSO Corporation
Kariya-city
JP
|
Family ID: |
38573662 |
Appl. No.: |
11/784108 |
Filed: |
April 5, 2007 |
Current U.S.
Class: |
62/3.3 ;
62/3.7 |
Current CPC
Class: |
B60N 2/5657 20130101;
F25B 21/04 20130101; B60N 2/5692 20130101; B60H 2001/003 20130101;
B60N 2/5635 20130101; B60H 1/00285 20130101; F25B 2700/2107
20130101; B60N 2/5685 20130101; B60H 1/00478 20130101 |
Class at
Publication: |
62/3.3 ;
62/3.7 |
International
Class: |
F25B 21/02 20060101
F25B021/02 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 7, 2006 |
JP |
2006-106785 |
Dec 28, 2006 |
JP |
2006-355966 |
Claims
1. A heating and cooling device comprising: a case having an air
passage; a blower for sending air to the air passage; a
thermoelectric conversion element disposed in the case, wherein the
thermoelectric conversion element has a heat-absorbing part and a
heat-emitting part, which are switched based on a current
direction, and heats or cools air sent by the blower by switching
the current direction; and a controller for stopping electricity
supplied to the thermoelectric conversion element, when air sent by
the blower toward the thermoelectric conversion element is stopped
while the thermoelectric conversion element is supplied with
electricity.
2. The heating and cooling device according to claim 1, wherein the
controller stops electricity supplied to the thermoelectric
conversion element, when the blower stops sending air.
3. The heating and cooling device according to claim 2, wherein the
controller stops electricity supplied to the thermoelectric
conversion element, when the controller detects that a driving
signal output into the blower stops.
4. The heating and cooling device according to claim 2, wherein the
blower includes a revolution signal detecting portion for detecting
a driving state of the blower, and the controller stops electricity
supplied to the thermoelectric conversion element, when the
controller detects that a detection signal input into the
controller from the revolution signal detecting portion stops.
5. The heating and cooling device according to claim 4, wherein the
controller stops electricity supplied to the thermoelectric
conversion element, when the controller detects that the detection
signal stops for a time period equal to or longer than a
predetermined time period.
6. The heating and cooling device according to claim 1, further
comprising: a duct, through which the blower and the thermoelectric
conversion element are connected, wherein air sent by the blower
toward the thermoelectric conversion element is stopped, when the
duct is disconnected between the blower and the thermoelectric
conversion element, and the controller stops electricity supplied
to the thermoelectric conversion element, when the controller
detects a disconnection of the duct.
7. The heating and cooling device according to claim 6, wherein the
blower includes a revolution signal detecting portion for detecting
a driving state of the blower, and the controller stops electricity
supplied to the thermoelectric conversion element, when the
controller detects that a detection signal output from the
revolution signal detecting portion has a number of revolutions
equal to or smaller than a predetermined value.
8. The heating and cooling device according to claim 7, wherein the
controller stops electricity supplied to the thermoelectric
conversion element, when the controller detect that the detection
signal stops for a time period equal to or longer than a
predetermined time period.
9. The heating and cooling device according to claim 1, wherein the
controller stops electricity supplied to the thermoelectric
conversion element, when the controller detects that a driving
current flowing through the blower is equal to or larger than a
predetermined value.
10. The heating and cooling device according to claim 1, wherein
the thermoelectric conversion element includes a temperature
detection portion for detecting an element temperature of the
thermoelectric conversion element, and the controller stops
electricity supplied to the thermoelectric conversion element, when
the controller detects that the element temperature is equal to or
larger than a predetermined temperature.
11. The heating and cooling device according to claim 1, wherein
the blower and the thermoelectric conversion element are disposed
in a seat having an air-blowing hole thereon and a duct therein.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is based on Japanese Patent Applications
No. 2006-106785 filed on Apr. 7, 2006, and No. 2006-355966 filed on
Dec. 28, 2006, the disclosure of which are incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a heating and cooling
device having a thermoelectric conversion element.
[0004] 2. Description of Related Art
[0005] JP-A-2006-21572 discloses a heating and cooling device. The
heating and cooling device includes a Peltier element
(thermoelectric conversion element) and a fan, and is disposed in a
seat of a vehicle. A hole for blowing air and a duct communicating
with the hole are provided in the seat. The Peltier element
converts electricity into heat, and the fan sends air toward the
hole.
[0006] When air is cooled at a low-temperature side of the Peltier
element and the cooled air is blown through the hole, heat
generated at a high-temperature side of the Peltier element is
exhausted outside of the vehicle. When air is heated at a
high-temperature side of the Peltier element and the heated air is
blown through the hole, cold energy generated at a low-temperature
side of the Peltier element is exhausted outside of the
vehicle.
[0007] Further, a voltage applied to the Peltier element and an
amount of air sent by the fan are controlled in a combination.
Thus, a temperature of air blown through the hole can be
controlled.
[0008] When the Peltier element is in an operating condition, the
fan is also in an operating condition to send air to the Peltier
element. However, when the fan is stopped for any reason even
though the fan and the Peltier element are in the operating
condition, air is not sent to the Peltier element, for example.
[0009] At this time, the Peltier element may be overheated, because
air is not sent to the Peltier element. Therefore, a temperature of
the Peltier element may be abnormally increased. Moreover, when the
Peltier element has a possibility to have the high temperature, a
cushion material adjacent to the Peltier element is required to
have a high heat-resistance. Thus, cost for manufacturing the
heating and cooling device may be increased.
SUMMARY OF THE INVENTION
[0010] In view of the foregoing and other problems, it is an object
of the present invention to provide a heating and cooling
device.
[0011] According to an example of the present invention, a heating
and cooling device includes a case having an air passage, a blower
for sending air to the air passage, a thermoelectric conversion
element and a controller. The thermoelectric conversion element is
disposed in the case, and has a heat-absorbing part and a
heat-emitting part, which are switched based on a current
direction. The thermoelectric conversion element heats or cools air
sent by the blower by switching the current direction. The
controller stops electricity supplied to the thermoelectric
conversion element, when air sent by the blower toward the
thermoelectric conversion element is stopped while the
thermoelectric conversion element is supplied with electricity.
[0012] Accordingly, an abnormal temperature increasing of the
Peltier element can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The above and other objects, features and advantages of the
present invention will become more apparent from the following
detailed description made with reference to the accompanying
drawings. In the drawings:
[0014] FIG. 1 is a schematic diagram showing a heating and cooling
device according to a first embodiment of the present
invention;
[0015] FIG. 2 is a schematic electrical circuit diagram showing the
heating and cooling device;
[0016] FIG. 3 is a flow chart showing operations of a controller of
the heating and cooling device;
[0017] FIG. 4 is a schematic diagram showing a heating and cooling
device according to a second embodiment;
[0018] FIG. 5 is a flow chart showing operations of a controller of
the heating and cooling device of the second embodiment;
[0019] FIG. 6 is a graph showing relationships between an amount of
air and a static pressure, or a number of revolutions;
[0020] FIG. 7 is a schematic electrical circuit diagram showing a
heating and cooling device according to a third embodiment; and
[0021] FIG. 8 is a flow chart showing operations of a controller of
the heating and cooling device of the third embodiment.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
First Embodiment
[0022] A first embodiment will be described with reference to FIGS.
1-3. As shown in FIG. 1, a seat 1 includes a seat back 1a and a
seat bottom 1b, and a heating and cooling device 5 is used in each
of the seat back 1a and the seat bottom 1b. A first space 4a is
provided in the seat back 1a, and a second space 4b is provided in
the seat bottom 1b. A controller 10 shown in FIG. 2 controls the
heating and cooling device 5.
[0023] A first duct 3a communicating with the first space 4a is
provided in the seat back 1a, and plural air-blowing holes 2
communicating with the first duct 3a are provided in the seat back
1a. A second duct 3b communicating with the second space 4b is
provided in the seat bottom 1b, and plural air-blowing holes 2
communicating with the second duct 3b are provided in the seat
bottom 1b.
[0024] The heating and cooling device 5 is arranged in each of the
first space 4a and the second space 4b. Specifically, the heating
and cooling device 5 is supported by a net-shaped supporting member
7, and the supporting member 7 is constructed with a spring for
supporting a cushion material (not shown) disposed in the seat
1.
[0025] The heating and cooling device 5 in the seat back 1a
includes a case 50 having an air passage 50a, a blower 51A for
sending air to the air passage 50a and a Peltier element 52A
disposed in the air passage 50a of the case 50. The heating and
cooling device 5 in the seat bottom 1b includes the case 50 having
the air passage 50a, a blower 51B for sending air to the air
passage 50a and a Peltier element 52B disposed in the air passage
50a of the case 50.
[0026] The Peltier element 52A, 52B is a thermoelectric conversion
element in the first embodiment. The blower 51A, 51B introduces air
from a vehicle compartment into the seat 1, and sends the
introduced air toward the hole 2 through the Peltier element 52A,
52B. Further, the blower 51A, 51B includes a fan 511 and a motor
512 for driving the fan 511.
[0027] A brushless motor is used as the motor 512, and controlled
by the controller 10 (to be described below) in response to a
revolution signal of a pulse-width modulation (PWM) control.
Further, as shown in FIG. 2, the motor 512 has a hall element 51a
(revolution signal detecting portion) for detecting operation state
of the blower 51A, 51B. A revolution signal detected by the hall
element 51a is input into the controller 10.
[0028] That is, the hall element 51a detects the operation state of
the blower 51A, 51B as magnetic data, and the magnetic data are
electrically converted into a detected revolution signal. When the
motor 512 is revolving, the detected revolution signal is output
into the controller 10.
[0029] However, air sent by the blower 51A, 51B toward the Peltier
element 52A, 52B may be stopped for some sort of reason. For
example, the blower 51A, 51B stops and is in a lock state, the
detected revolution signal is not output into the controller 10.
Therefore, the detected revolution signal may be intermittently
output at this time.
[0030] The Peltier element 52A, 52B is a known thermoelectric
conversion element, and converts electricity into heat. The Peltier
element 52A, 52B includes a first heat exchanger 52a and a second
heat exchanger 52b, as shown in FIG. 1. When the first heat
exchanger 52a operates as a heat-absorbing part, the second heat
exchanger 52b operates as a heat-emitting part. When the first heat
exchanger 52a operates as the heat-emitting part, the second heat
exchanger 52b operates as the heat-absorbing part. The
heat-absorbing part and the heat-emitting part can be switched
based on a direction of current flowing through the Peltier element
52A, 52B. The Peltier element 52A, 52B is electrically connected to
a direct-current power source (not shown).
[0031] Each of the first and second heat exchangers 52a, 52b has an
electrode (not shown) connected to a thermoelectric semiconductor
therein, and plural fins for emitting or absorbing heat thereon.
Each of the first and second heat exchangers 52a, 52b heats or
cools air introduced from the vehicle compartment by the blower
51A, 51B, and the heating operation and the cooling operation can
be switched by changing the direction of current. When air sent by
the blower 51A, 51B toward the Peltier element 52A, 52B is stopped,
a temperature of the Peltier element 52A, 52B may be abnormally
increased.
[0032] In the first embodiment, a direct current is applied to the
Peltier element 52A, 52B such that the first heat exchanger 52a
becomes the heat-absorbing part and that the second heat exchanger
52b becomes the heat-emitting part. At this time, the first heat
exchanger 52a cools air introduced from the vehicle compartment,
and the second heat exchanger 52b heats air introduced from the
vehicle compartment. A downstream side of the first heat exchanger
52a is connected to the duct 3a, 3b.
[0033] Further, a downstream side of the second heat exchanger 52b
is connected to an exhaust duct 6a, 6b communicating with outside
of the seat 1. The exhaust duct 6a (6b) and the duct 3a (3b) are
separated by a separation board (not shown). Therefore,
air-conditioning air cooled by the first heat exchanger 52a and
exhaust air heated by the second heat exchanger 52b do not mix with
each other.
[0034] In the first embodiment, a downstream end of the exhaust
duct 6a, 6b is open to outside of the seat 1. However, the
downstream end of the exhaust duct 6a, 6b may be extended to
outside of the vehicle. A temperature sensor 53A, 53B (temperature
detecting portion) detects a temperature of air blown from the
first heat exchanger 52a to the duct 3a, 3b.
[0035] The temperature sensor 53A, 53B is disposed at a downstream
end of the first heat exchanger 52a. Therefore, the temperature
sensor 53A, 53B can detect an element temperature of the first heat
exchanger 52a of the Peltier element 52A, 52B. When the blower 51A,
51B stops for some sort of reason, the element temperature can be
detected by the temperature sensor 53A, 53B. The temperature sensor
53A, 53B is electrically connected to the controller 10 to output
the detected temperature, as shown in FIG. 2. In addition, a
temperature sensor (not shown) for detecting a temperature of air
blown into the exhaust duct 6a, 6b is disposed at a downstream end
of the second heat exchanger 52b. This temperature sensor is also
electrically connected to the controller 10 to output the detected
temperature.
[0036] The controller 10 is arranged in either one of the space 4a
or the space 4b, and is constructed with a microcomputer as a main
part. A ROM (not shown) is arranged in the controller 10, and a
predetermined air-conditioning program is stored in the ROM.
[0037] The controller 10 controls the blower 51A, 51B and
electricity supplied to the Peltier element 52A, 52B based on the
temperature detected by the temperature sensor 53A, 53B. Further,
an inside temperature sensor (not shown) detects a compartment
temperature, an outside temperature sensor (not shown) detects an
outside air temperature, a solar radiation sensor (not shown)
detects an amount of solar radiation, and instruction by an
occupant is input into an operation panel (not shown). The
controller 10 controls the blower 51A, 51B and electricity supplied
to the Peltier element 52A, 52B based on the compartment
temperature, the outside air temperature, the amount of solar
radiation and the instruction.
[0038] Further, a target temperature can be set for the heating and
cooling device 5 by using a temperature-adjusting switch (not
shown) provided in the operation panel. An actuation switch 11
shown in FIG. 2 is also provided in the operation panel.
[0039] FIG. 2 shows an electrical circuit diagram of the blower
51A, 51B and the Peltier element 52A, 52B, which are controlled by
the controller 10. The controller 10 has a positive electrode side
power terminal B+, a negative electrode side power terminal B-, a
revolution signal output terminal NT1 and a revolution signal input
terminal NT2, in order to be connected to the motor 512 of the
blower 51A, 51B.
[0040] Each terminal B+, B-, NT1, NT2 is connected to the motor 512
of the blower 51A for the seat back 1a, and the motor 512 of the
blower 51B for the seat bottom 1b. Each motor 512 has a power input
terminal 51b, a power output terminal 51c, a revolution signal
input terminal 51d and an output terminal 51e for the hall element
51a.
[0041] The power input terminal 51b is connected to the positive
electrode side power terminal B+. The power output terminal 51c is
connected to the negative electrode side power terminal B-. The
revolution signal input terminal 51d is connected to the revolution
signal output terminal NT1. The output terminal 51e is connected to
the revolution signal input terminal NT2. When the actuation switch
11 is turned on, the blower 51A, 51B are actuated.
[0042] The Peltier element 52B for the seat bottom 1b and the
Peltier element 52A for the seat back 1a are electrically connected
to the controller 10 in series. The controller 10 has a positive
electrode side power terminal TED+, a negative electrode side power
terminal TED-, potential input terminals VT1, VT2, VT3 and
connection terminals TC, TCS, TB, TBS for the temperature sensor
53A, 53B.
[0043] The Peltier element 52A, 52B has a power input terminal 52c,
a power output terminal 52d and a potential detection terminal 52e.
The positive electrode side power terminal TED+ is connected to the
power input terminal 52c of the Peltier 52B for the seat bottom 1b.
The negative electrode side power terminal TED- is connected to the
power output terminal 52d of the Peltier 52A for the seat back 1a.
The potential input terminal VT1 is connected to the potential
detection terminal 52e of the Peltier 52B for the seat bottom 1b.
The potential input terminal VT3 is connected to the potential
detection terminal 52e of the Peltier 52A for the seat back 1a.
[0044] The power output terminal 52d of the Peltier 52B for the
seat bottom 1b is connected to the power input terminal 52c of the
Peltier 52A for the seat back 1a. A potential detection terminal
52f is electrically provided between the power output terminal 52d
of the Peltier 52B for the seat bottom 1b and the power input
terminal 52c of the Peltier 52A for the seat back 1a. The potential
detection terminal 52f is connected to the potential input terminal
VT2.
[0045] Each temperature sensor 53A, 53B has connection terminals
53a, 53b. The connection terminal 53a of the temperature sensor 53B
for the seat bottom 1b is connected to the connection terminal TC.
The connection terminal 53b of the temperature sensor 53B for the
seat bottom 1b is connected to the connection terminal TCS. The
connection terminal 53a of the temperature sensor 53A for the seat
back 1a is connected to the connection terminal TB. The connection
terminal 53b of the temperature sensor 53A for the seat back 1a is
connected to the connection terminal TBS.
[0046] FIG. 3 shows operations of the heating and cooling device 5.
At step 110, an air-conditioning control program is started by
turning on the actuation switch 11. Then, at step 120, heat load
data are detected. Specifically, a target temperature set by an
occupant is detected, and temperature data and solar radiation data
output from the above-described sensors are detected.
[0047] At step 130, a target temperature for air blown from the
Peltier element 52A, 52B is calculated based on the heat load data.
Then, the element temperature of the Peltier element 52A, 52B and
amount of air blown through the Peltier element 52A, 52B are
calculated based on the target temperature. Further, a target
number of revolutions for the blower 51A, 51B is calculated based
on the amount of air. Furthermore, a voltage to be applied to the
Peltier element 52A, 52B is calculated based on the element
temperature.
[0048] At step 140, a target revolution signal having the
calculated target number of revolutions is output from the output
terminal NT1 into the input terminal 51d to drive the blower 51A,
51B, and the calculated voltage is applied to the Peltier element
52A, 52B to actuate the Peltier element 52A, 52B.
[0049] Thereby, air cooled by the first heat exchanger 52a is blown
through the hole 2 of the seat 1, and air heated by the second heat
exchanger 52b is exhausted outside of the seat 1. Thus,
air-conditioning operation for the seat 1 can be performed. Then,
at step 150, the target revolution signal is determined to be
output from the output terminal NT1 into the input terminal 51d or
not. That is, the target revolution signal is monitored. When the
target revolution signal is output, operation is determined to be
normal, and moves to step 160. When the target revolution signal is
not output, operation is determined to be abnormal, and moves to
step 190.
[0050] At step 160, a revolution signal detected by the hall
element 51a is determined to be input from the output terminal 51e
for the hall element 51a into the input terminal NT2 or not. That
is, the detected revolution signal is monitored. When the detected
revolution signal is input, operation is determined to be normal,
and moves to step 170. When the detected revolution signal is not
input, operation is determined to be abnormal, and moves to step
190.
[0051] Here, the revolution signal is detected after a
predetermined time period (e.g., about 4-10 seconds) passes. If the
time period is increased, the element temperature of the Peltier
element 52A, 52B may be rapidly increased. The time period may be
reduced less than 4 seconds. However, when the time period is too
much reduced, signal glitch (error) may be detected.
[0052] At step 170, the element temperature is determined to be
equal to or smaller than a predetermined temperature R1 (e.g.,
about 80.degree. C.) or not. That is, the element temperature
detected by the temperature sensor 53A, 53B is monitored. When the
element temperature is equal to or smaller than the predetermined
temperature R1, operation is determined to be normal, and moves to
step 180. When the element temperature is larger than the
predetermined temperature R1, operation is determined to be
abnormal, and moves to step 190.
[0053] When voltage is applied to the Peltier element 52A, 52B and
air sent by the blower 51A, 51B toward the Peltier element 52A, 52B
is stopped, the element temperature is rapidly increased.
Therefore, the lock state of the blower 51A, 51B or dust-clogging
in the air passage 50a can be detected by detecting the element
temperature, when the amount of air is small or when the blower
51A, 51B stops. When the operations are determined to be normal at
the above-described three steps 150, 160, 170, the blower 51A, 51B
and the Peltier element 52A, 52B are kept operating, at step
180.
[0054] If at least one of the operations is determined to be
abnormal at the above-described three steps 150, 160, 170, the
blower 51A, 51B is determined to stop and be in the lock state.
That is, air sent by the blower 51A, 51B toward the Peltier element
52A, 52B is determined to be stopped. Therefore, at step 190, the
Peltier element 52A, 52B and the blower 51A, 51B are stopped by the
controller 10.
[0055] Due to the above-described three steps 150, 160, 170, air
sent by the blower 51A, 51B toward the Peltier element 52A, 52B can
be easily determined to be stopped. Further, abnormal temperature
increasing of the Peltier element 52A, 52B can be reduced, because
electricity supplied to the Peltier element 52A, 52B can be stopped
when air is not sent toward the Peltier element 52A, 52B.
[0056] According to the first embodiment, the lock state of the
blower 51A, 51B can be easily detected by detecting that the blower
51A, 51B stops while the blower 51A, 51B is controlled to operate.
At this time, the abnormal temperature increasing of the Peltier
element 52A, 52B can be stopped by stopping electricity supplied to
the Peltier element 52A, 52B.
[0057] When the target revolution signal output into the blower
51A, 51B is stopped, electricity supplied to the Peltier element
52A, 52B is stopped. The stop state of the blower 51A, 51B can be
easily detected by detecting that the target revolution signal is
not output into the blower 51A, 51B.
[0058] Further, the blower 51A, 51B has the hall element 51a for
detecting a driving state of the blower 51A, 51B. When a detection
signal is not input into the controller 10 from the hall element
51a, electricity supplied to the Peltier element 52A, 52B is
stopped. Due to the hall element 51a, the stop state of the blower
51A, 51B can be easily detected. Furthermore, when the detection
signal is not input into the controller 10 from the hall element
51a for a predetermined or more time period, electricity supplied
to the Peltier element 52A, 52B is stopped. For example, when the
detection signal is not input for four or more seconds, the lock
state of the blower 51A, 51B can be easily detected.
[0059] Further, the Peltier element 52A, 52B has the temperature
sensor 53A, 53B for detecting the element temperature of the
Peltier element 52A, 52B. When the element temperature is larger
than the predetermined temperature R1, electricity supplied to the
Peltier element 52A, 52B is stopped. Thus, the abnormal temperature
increasing of the Peltier element 52A, 52B can be reduced.
Furthermore, the abnormal temperature increasing of the Peltier
element 52A, 52B can be monitored by the above-described three
detecting steps 150, 160, 170.
Second Embodiment
[0060] A second embodiment will be described with reference to
FIGS. 4-6. As shown in FIG. 4, a duct 54 is disposed between the
blower 51A, 51B and the Peltier element 52A, 52B in the second
embodiment.
[0061] Specifically, the duct 54 has a wave shape. An end of the
duct 54 is connected to a discharge side of the blower 51A, 51B,
and the other end of the duct 54 is connected to the case 50 of the
Peltier element 52A, 52B. Thereby, the heating and cooling device 5
can be easily mounted in the space 4a, 4b of the seat 1 having a
complicated shape.
[0062] When electricity is supplied to the Peltier element 52A,
52B, the duct 54 may be disconnected (detached) by vibration of the
vehicle. The disconnection of the duct 54 can be detected in the
second embodiment.
[0063] Specifically, as shown in FIG. 5, step 165 is provided
between step 160 and step 170. At step 165, the number N of
revolutions of the detected revolution signal input at step 160 is
compared with a predetermined number R2 of revolutions. The number
N of revolutions of the detected revolution signal is determined to
be equal to or larger than the predetermined number R2 of
revolutions or not. That is, the number N of revolutions of the
detected revolution signal detected by the hall element 51a is
monitored.
[0064] Here, when the number N of revolutions of the detected
revolution signal is determined to be equal to or larger than the
predetermined number R2 of revolutions, operation moves to step
170. When the number N of revolutions of the detected revolution
signal is determined to be smaller than the predetermined number R2
of revolutions, operation is determined to be abnormal, and moves
to step 190.
[0065] At step 165, the duct 54 is determined to be disconnected or
not. When the number N of revolutions of the detected revolution
signal is smaller than the predetermined number R2 of revolutions,
the duct 54 is determined to be disconnected.
[0066] A reason for this determination will be described with
reference to FIG. 6. A solid line in FIG. 6 shows a pressure
characteristic X1, which is a relationship between a static
pressure and an amount of air when the duct 54 is normally mounted
between the blower 51A, 51B and the Peltier element 52A, 52B. At
this time, the blower 51A, 51B has a number Y1 of revolutions.
[0067] A dashed line in FIG. 6 shows a pressure characteristic X2,
which is a relationship between a pressure and an amount of air
when the duct 54 is disconnected from the Peltier element 52A, 52B.
At this time, the blower 51A, 51B has a number Y2 of revolutions.
That is, when the duct 54 is disconnected, the number of
revolutions is decreased from Y1 to Y2. Therefore, the
disconnection of the duct 54 can be detected by monitoring the
detected number N of revolutions, at step 165.
[0068] According to the second embodiment, the disconnection of the
duct 54 can be easily detected. Further, the number of revolutions
of the blower 51A, 51B can be easily detected by the number N of
revolutions of the revolution signal detected by the hall element
51a. The other parts in the second embodiment may be made similar
to the first embodiment.
Third Embodiment
[0069] A third embodiment will be described with reference to FIGS.
7 and 8. In the above embodiments, the hall element 51a detects the
driving state of the blower 51A, 51B, when a brushless motor is
used as the motor 512. However, when a motor having brush is used
as the motor 512, current flowing through the blower 51A, 51B can
be detected.
[0070] Specifically, as shown in FIG. 7, the controller 10 has the
positive electrode side power terminal B+, the negative electrode
side power terminal B- and a driving current input terminal Ip, in
order to be connected to the motor 512 of the blower 51A, 51B.
Further, the motor 512 of the blower 51A, 51B has the power input
terminal 51b, the power output terminal 51c and a driving current
detection terminal 51f.
[0071] The power input terminal 51b is connected to the positive
electrode side power terminal B+. The power output terminal 51c is
connected to the negative electrode side power terminal B-. The
driving current detection terminal 51f is connected to the driving
current input terminal Ip. Then, as shown in FIG. 8, at step 160a,
a driving current flowing from the driving current detection
terminal 51f into the driving current input terminal Ip is
determined to be equal to or smaller than a predetermined value R3
or not.
[0072] Here, this determination is performed in order to monitor
the driving current flowing through the blower 51A, 51B. When the
driving current is equal to or smaller than the predetermined value
R3, operation is determined to be normal and moves to step 170.
When the driving current is larger than the predetermined value R3,
operation is determined to be abnormal and moves to step 190.
[0073] That is, the driving current is increased when the blower
51A, 51B stops and is in the lock state for some sort of reason,
and this characteristic is used for detecting the lock state of the
blower 51A, 51B. Thereby, the lock state of the blower 51A, 5B can
be easily detected. The other parts in the third embodiment may be
made similar to the first and second embodiments.
Other Embodiments
[0074] In the above embodiments, the heating and cooling device 5
is arranged in each of the seat back 1a and the seat bottom 1b.
However, when the Peltier element 52A is arranged in the seat back
1a and the Peltier element 52B is arranged in the seat bottom 1b,
the blower 51B may not be arranged in the seat bottom 1b, and the
blower 51A can send air toward the Peltier element 52B of the seat
bottom 1b through a duct. Alternatively, the blower 51A may not be
arranged in the seat back 1a, and the blower 51B can send air
toward the Peltier element 52A of the seat back 1a through a
duct.
[0075] Further, in the above embodiments, the first heat exchanger
52a cools air, and the second heat exchanger 52b heats air.
Alternatively, the first heat exchanger 52a may heat air, and the
second heat exchanger 52b may cool air.
[0076] Further, in the above embodiments, the single controller 10
is used. Alternatively, the heating and cooling device 5 may be
electrically connected to a vehicle air-conditioning controller,
and the heat load may be detected by the vehicle air-conditioning
controller at step 120 shown in FIGS. 3, 5 and 8. Furthermore, the
controller 10 and the vehicle air-conditioning controller may be
constructed in a combination.
[0077] Further, in the above embodiments, the controller 10 is
arranged in either one of the space 4a or the space 4b in the seat
1. Alternatively, the controller 10 may be arranged adjacent to the
seat 1.
[0078] Such changes and modifications are to be understood as being
within the scope of the present invention as defined by the
appended claims.
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