Vehicular air conditioning system

Abstract

[Problem] To provide a vehicular air conditioning system enabling efficient air conditioning of a vehicle interior and efficient temperature control of a seat during pre-air conditioning of the vehicle interior. [Solution] A control device 3 comprises: a pre-air conditioning determination unit 31 that determines whether pre-air conditioning for air conditioning a vehicle interior before a person enters the vehicle has been initiated; an inside / outside temperature difference acquisition unit 32 that acquires the value of the temperature difference between an air conditioning target temperature inside the vehicle interior and the outside air temperature; a vehicle interior air conditioning operation mode selection unit 34 that, if pre-air conditioning has been initiated and the value of the temperature difference is at or above a predetermined value, selects a seat temperature control priority mode in which air is blown out of, among a plurality of vehicle interior air outlets in a vehicle interior air conditioning unit 1, the vehicle interior air outlet that is closest in the height direction to a seat air inlet in communication with an inlet-side end of a ventilation path of a seat temperature control unit 2; and a seat temperature control activation indication unit 35 that activates the seat temperature control unit if at least the seat temperature control priority mode has been selected.

Description

Vehicle air conditioning systems

[0001] The present invention relates to a vehicle air conditioning system to be installed in a vehicle.

[0002] Vehicles such as automobiles are equipped with an air conditioning system called an HVAC (Heating, Ventilation, and Air-Conditioning) to condition the interior of the vehicle. HVAC not only regulates the temperature and humidity of the air blown into the vehicle cabin, but also allows the position of the air to be adjusted, making it possible to maintain a comfortable interior.

[0003] In some cases, air conditioning systems installed in such vehicles are provided with a so-called "pre-air conditioning" function that starts air conditioning in the vehicle cabin before the occupants get into the vehicle. In the invention described in Patent Document 1, this pre-air conditioning function controls the temperature of the seating surface by blowing conditioned air from the seat, thereby improving the comfort of the occupants.

[0004] Patent No. 5369476

[0005] However, if a vehicle is left unused for a long period of time, for example, during high summer temperatures or low winter temperatures, the seats will accumulate heat. This heat accumulation will affect the air conditioning in the vehicle cabin, not only making it time-consuming to bring the temperature of the vehicle cabin to a comfortable level, but also making it time-consuming to adjust the temperature of the seat itself due to the heat accumulation in the seat, resulting in problems such as passenger comfort not being fully ensured.

[0006] SUMMARY OF THE INVENTION The present invention provides a vehicle air conditioning system that can efficiently perform air conditioning of the vehicle compartment and temperature control of the seats during pre-air conditioning of the vehicle compartment.

[0007] A vehicle air conditioning system according to one aspect of the present invention includes a vehicle interior air conditioning unit that blows conditioned air into a vehicle interior and includes a plurality of vehicle interior air outlets that are provided at least at different positions in a height direction of the vehicle interior from each other, and that conditions the vehicle interior; a seat temperature control unit that includes an air passage that draws air into the vehicle interior from an inlet side end that communicates with a seat inlet port in the vehicle interior and blows the air out from an outlet side end that communicates with a seat outlet in the vehicle interior, and that controls the temperature of a seat in the vehicle interior; and a control device that controls the vehicle interior air conditioning unit and the seat temperature control unit, wherein the control device controls the vehicle interior air conditioning unit to adjust the temperature of the seat in the vehicle interior before an occupant gets into the vehicle. The vehicle air conditioning system includes a pre-air conditioning determination unit that determines whether pre-air conditioning for air conditioning the vehicle interior has started; an inside / outside temperature difference acquisition unit that acquires the value of the temperature difference between the air conditioning target temperature inside the vehicle interior and the outside air temperature; a vehicle interior air conditioning operation mode selection unit that, when the pre-air conditioning has started and the value of the temperature difference is equal to or greater than a predetermined value, selects a seat temperature control priority mode in which air is blown out from the vehicle interior air outlet that is closest to the seat intake port in the height direction among the multiple vehicle interior air outlets in the vehicle interior air conditioning unit; and a seat temperature control operation instruction unit that operates the seat temperature control unit when at least the seat temperature control priority mode is selected.

[0008] In the seat temperature control unit of the above-mentioned vehicle air conditioning system, the intake side end of the ventilation duct may be connected to the seat intake port located below the seat surface of the seat, and the outlet side end of the ventilation duct may be connected to the seat outlet formed on the surface of the seat.

[0009] In the seat temperature control unit of the vehicle air conditioning system, the outlet side end of the ventilation duct may be connected to the seat outlet located below the seat surface, and the intake side end of the ventilation duct may be connected to the seat inlet formed on the surface of the seat.

[0010] In the above-mentioned vehicle air conditioning system, the control device may further have a seat information acquisition unit that acquires seat identification information to identify the seat in which the occupant plans to sit among the plurality of seats, and the seat temperature control operation instruction unit may cause the seat air conditioning unit to perform temperature control only on the seat identified by the seat information acquisition unit.

[0011] In the above vehicle air conditioning system, the control device further has a seat temperature acquisition unit that acquires the temperature of the seat, and the passenger compartment air conditioning operation mode selection unit may, after selecting the seat temperature control priority mode, switch to an operation mode other than the seat temperature control priority mode if the temperature of the seat is below a predetermined temperature control target value when cooling by the passenger compartment air conditioning unit, or if the temperature of the seat is above a predetermined temperature control target value when heating by the passenger compartment air conditioning unit.

[0012] In the above-mentioned vehicle air conditioning system, the control device may further have a seat temperature control stop instruction unit that stops operation of the seat temperature control unit when the temperature of the seat is below a predetermined temperature control target value during cooling, or when the temperature of the seat is above a predetermined temperature control target value during heating.

[0013] In the above vehicle air conditioning system, the control device further has a seat temperature control resumption signal detection unit that detects a seat temperature control resumption signal that starts temperature control of the seat, and the passenger compartment air conditioning operation mode selection unit may reselect the seat temperature control priority mode when the seat temperature control resumption signal detection unit detects the seat temperature control resumption signal when an operation mode other than the seat temperature control priority mode is selected.

[0014] According to the above-described vehicle air conditioning system, it is possible to efficiently perform air conditioning of the vehicle compartment and temperature control of the seats during pre-air conditioning of the vehicle compartment.

[0015] It is a schematic diagram of a vehicle air conditioning system according to an embodiment of the present invention, as seen from the width direction of the vehicle. It is a functional block diagram of a control device of the vehicle air conditioning system. It is a flowchart showing the control flow of the control device of the vehicle air conditioning system. It is a functional block diagram of a control device according to a modified example of the vehicle air conditioning system.

[0016] Hereinafter, a vehicle air conditioning system 100 according to an embodiment of the present invention will be described. As shown in Fig. 1, the vehicle air conditioning system 100 is installed in a vehicle such as an automobile, and controls the air conditioning in a passenger compartment A and the temperature of a passenger seat SE.

[0017] (Overall Configuration) Specifically, the vehicle air conditioning system 100 includes a vehicle interior air conditioning unit 1 that conditions the air inside the vehicle interior A, a seat temperature control unit 2 that controls the temperature of the seat SE, and a control device (ECU: Electronic Control Unit) 3 that controls the vehicle interior air conditioning unit 1 and the seat temperature control unit 2.

[0018] (Vehicle Compartment Air Conditioning Unit) The vehicle compartment air conditioning unit 1 cools or heats the vehicle compartment A by blowing conditioned air toward the vehicle compartment A. Although a detailed description of the configuration will be omitted, the vehicle compartment air conditioning unit 1 is configured with an HVAC (Heating, Ventilation, and Air-Conditioning) 1x. The HVAC 1x takes in air using a blower (not shown), cools it using an evaporator, and / or heats it using a heater core, and supplies the air to the vehicle compartment A. The vehicle compartment air conditioning unit 1 has at least face air outlets 10a provided in front of each of the driver's seat and passenger seat SE at a position corresponding to the upper body of an occupant seated in the seat SE, and foot air outlets 10b provided in front of each of the driver's seat and passenger seat SE at a position corresponding to the feet of the occupant seated in the seat SE. That is, the vehicle interior air conditioning unit 1 has a plurality of vehicle interior air outlets 10 provided at least at different positions in the height direction of the vehicle interior A. The flow rate of air blown out from the face air outlet 10a and the foot air outlet 10b is adjusted by operating a damper (not shown) in the HVAC 1x by a control device 3, which will be described in detail later.

[0019] (Seat temperature control unit) One seat temperature control unit 2 is provided for each seat SE: the driver's seat, the passenger seat, and the rear seat. Each seat temperature control unit 2 has a blower 20 provided inside a support leg B that supports the seat from below, and an air passage 21 arranged inside the support leg B and communicating with the blower 20. An air intake end 21a, which is the end on the air intake side (upstream side in the air flow direction) of the air passage 21, communicates with a seat air intake port Ba that opens forward of the support leg B. Therefore, the seat air intake port Ba is provided below the seat surface Fa of the seat SE.

[0020] Furthermore, the outlet end 21b of the ventilation passage 21 of the seat temperature control unit 2, which is the end on the air outlet side (downstream in the air flow direction) of the air passage 21, communicates with the seat outlets SEa, which are multiple through-holes formed at intervals in the seat surface Fa and back surface Fb, which form the surface of the seat SE, through the inner space SP of the seat SE. As a result, air from within the vehicle compartment A is drawn into the ventilation passage 21 by the blower 20 through the seat inlet Ba and then blown out from the seat outlets SEa, i.e., from the surface of the seat SE.

[0021] (Control Device) The control device 3 is configured by a microcomputer including a microprocessor, etc. As shown in Fig. 2 , the control device 3 has a pre-air conditioning execution unit 30, a pre-air conditioning determination unit 31, an inside / outside temperature difference acquisition unit 32, a cooling / heating determination unit 33, a passenger compartment air conditioning operation mode selection unit 34, and a seat temperature control operation instruction unit 35.

[0022] The pre-air-conditioning execution unit 30 causes pre-air-conditioning to be performed by the passenger compartment air-conditioning unit 1. Here, "pre-air-conditioning" refers to air conditioning in the passenger compartment A that is started before the occupant gets into the vehicle. The pre-air-conditioning execution unit 30 operates the blower of the HVAC 1x to perform pre-air-conditioning, for example, when it receives a pre-air-conditioning request signal transmitted by the occupant using a remote controller before getting into the vehicle, or when it receives a pre-air-conditioning request signal from a timer set in advance by the occupant.

[0023] The pre-air conditioning determining unit 31 determines whether or not pre-air conditioning has started.

[0024] The inside / outside temperature difference acquisition unit 32 acquires the value of the temperature difference ΔT between the air conditioning target temperature (air conditioning set temperature) in the vehicle compartment A and the outside air temperature. That is, the inside / outside temperature difference acquisition unit 32 acquires the value of the temperature difference ΔT by calculating the temperature difference ΔT (absolute value) using a measurement value of an outside air temperature sensor (not shown) provided in the vehicle.

[0025] The cooling / heating determination unit 33 determines whether the pre-air conditioning by the passenger compartment air conditioning unit 1 is cooling or heating. Here, cooling refers to a state where the condition "outside temperature > air conditioning target temperature" is satisfied, and heating refers to a state where the condition "outside temperature < air conditioning target temperature" is satisfied.

[0026] The passenger compartment air conditioning operation mode selection unit 34 selects an operation mode of the passenger compartment air conditioning unit 1. In this embodiment, the passenger compartment air conditioning operation mode selection unit 34 switches between a seat temperature control priority mode M1 and another operation mode M2 ​​based on predetermined conditions, which will be described later. Here, the "seat temperature control priority mode M1" refers to an operation mode in which air is blown out only from the foot outlet 10b that is closest to the seat inlet port Ba that communicates with the suction side end 21a of the seat temperature control unit 2, and the "operation mode M2 ​​other than the seat temperature control priority mode M1" refers to an operation mode in which the air blowing position is not particularly limited, such as an automatic air conditioning operation mode (a mode in which the air blowing position is appropriately changed depending on the temperature distribution in the passenger compartment A, etc.).

[0027] The seat temperature control operation instruction unit 35 operates the blower 20 of the seat temperature control unit 2 to control the temperature of the seat SE, at least when the seat temperature control priority mode M1 is selected by the passenger compartment air conditioning operation mode selection unit 34.

[0028] (Control Flow) Next, the control flow by the control device 3 will be described with reference to Fig. 3. First, step S1 is executed to determine whether pre-air conditioning has started. If pre-air conditioning has started in step S1, the determination is "YES" and the process proceeds to step S2. On the other hand, if pre-air conditioning has not started, the determination is "NO" and the temperature of the seat SE is not adjusted, and the air conditioning of the passenger compartment A is not performed either.

[0029] After the determination in step S1 is "YES," it is determined in step S2 whether the temperature difference ΔT between the air conditioning target temperature in the passenger compartment A and the outside air temperature is equal to or greater than a predetermined value α. If the temperature difference ΔT is equal to or greater than the predetermined value α in step S2, the determination is "YES" and the process proceeds to step S3. On the other hand, if the temperature difference ΔT is less than the predetermined value, the determination is "NO," and the air conditioning of the passenger compartment A continues from pre-air conditioning, and the passenger compartment air conditioning unit 1 operates in the above-mentioned operating mode M2, but the temperature of the seat SE is not controlled.

[0030] After a "YES" determination is made in step S2, step S3 is executed. In step S3, it is determined whether the vehicle interior air conditioning unit 1 is performing air conditioning. If the vehicle interior air conditioning unit 1 is performing air conditioning, the determination is "YES." In this case, the seat temperature control priority mode M1 is selected as the operating mode of the vehicle interior air conditioning unit 1. That is, among the multiple vehicle interior air outlets in the vehicle interior air conditioning unit 1, air is blown out from the vehicle interior air outlet 10 that is closest in height to the seat air inlet Ba that communicates with the suction-side end 21a of the air passage 21 of the seat temperature control unit 2. In the seat temperature control priority mode M1 of this embodiment, air is blown out only from the foot air outlet 10b, and air blowing from the face air outlet 10a is stopped. In this case, the output of the blower 20 of the seat temperature control unit 2 is maximized, and the blower 20 is operated for a predetermined period of time.

[0031] On the other hand, if the determination in step S3 is "NO," the process proceeds to step S4. In step S4, it is determined whether heating is being performed by the passenger compartment air conditioning unit 1, and if heating is being performed, the determination is "YES." In this case, the seat temperature control priority mode M1 is selected as the operating mode of the passenger compartment air conditioning unit 1, the output of the blower 20 of the seat temperature control unit 2 is set to maximum, and the blower 20 is operated for a predetermined time period. Note that if the determination in step S4 is "NO," the passenger compartment A is continuously air-conditioned by the passenger compartment air conditioning unit 1 in the operating mode M2 ​​from the pre-air conditioning, but the temperature of the seat SE is not controlled.

[0032] (Operation and Effect) According to the vehicle air conditioning system 100 of the present embodiment described above, when pre-air conditioning is being performed and it is determined that temperature control of the seat SE is necessary, the seat temperature control priority mode M1 is selected, and air from the vehicle interior air conditioning unit 1 can be blown out from a position close to the seat inlet port Ba, which communicates with the suction side end 21a of the ventilation duct 21 of the seat temperature control unit 2. This allows air temperature-controlled by the vehicle interior air conditioning unit 1 to be efficiently sent to the seat temperature control unit 2, thereby improving the temperature control effect of the seat SE. As a result, even if the vehicle has been left unused for a long time and the seat SE itself has accumulated heat, it is possible to efficiently condition the vehicle interior A and control the temperature of the seat SE during pre-air conditioning of the vehicle interior A. This leads to improved comfort for the occupant while seated.

[0033] The seat temperature control unit 2 draws in air from the vehicle interior A through a seat intake port Ba located below the seat surface Fa of the seat SE, and blows out the drawn-in air through the seat surface Fa and back surface Fb, which form the surface of the seat SE. This allows the air whose temperature has been controlled by the vehicle interior air conditioning unit 1 to efficiently heat or cool the surface of the seat SE.

[0034] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, conversely to the above-described case, the intake side end 21a of the ventilation passage 21 of the seat temperature control unit 2 may be connected to a seat intake port formed by a plurality of through holes formed at intervals on the surface of the seat SE (e.g., the seat surface Fa, the back surface Fb), and the outlet side end 21b of the ventilation passage 21 may be connected to a seat intake port provided below the seat surface Fa of the seat SE.

[0035] Furthermore, the seat intake port Ba and the seat outlet SEa do not necessarily have to be provided at the positions described above. For example, the seat outlet SEa is not limited to blowing air from the surface of the seat SE, but may be positioned so as to blow air toward the surface of the seat SE.

[0036] 4, the control device 3 may further include a seat identification information acquisition unit 36 ​​in addition to the above-described configuration. The seat identification information acquisition unit 36 ​​acquires seat identification information for identifying the seat SE in which the occupant is to sit, among the driver's seat, passenger seat, and rear seat. A signal of the seat identification information is transmitted to the seat identification information acquisition unit 36 ​​based on, for example, an operation of a remote controller by the occupant.

[0037] When the seat SE in which the occupant is scheduled to ride is identified by the seat identification information acquisition unit 36, only the seat temperature control unit 2 for the identified seat SE is operated to control the temperature of only the identified seat SE. On the other hand, when the seat SE in which the occupant is scheduled to ride is not identified, i.e., when seat identification information is not acquired, for example, only the seat temperature control unit 2 for the driver's seat may be operated. In this case, by controlling the temperature of only the identified seat SE, it is possible to reduce the power consumption that powers the blower 20 of the seat temperature control unit 2 compared to when controlling the temperature of all seats SE. Furthermore, even if the seat SE is not identified, it is possible to reduce the power consumption of the seat temperature control unit 2 by operating only the seat temperature control unit 2 for the driver's seat.

[0038] The control device 3 may further include a seat temperature acquisition unit 37 , a seat temperature control stop instruction unit 38 , and a seat temperature control restart signal detection unit 39 .

[0039] The seat temperature acquisition unit 37 acquires a measurement value of the seat temperature (e.g., the temperature of the seat surface) measured by a seat temperature sensor (not shown). The seat temperature sensor is provided, for example, on each of the driver's seat, passenger seat, and rear seat SE.

[0040] The seat temperature control stop instruction unit 38 stops the operation of the blower 20 in the seat temperature control unit 2 when the temperature of the seat SE is below a predetermined temperature control target value when the vehicle interior air conditioning unit 1 is cooling, or when the temperature of the seat SE is above a predetermined temperature control target value when the vehicle interior air conditioning unit 1 is heating.

[0041] The seat temperature control restart signal detection unit 39 detects a seat temperature control restart signal that restarts temperature control of the seat SE by the seat temperature control unit 2. This seat temperature control restart signal is transmitted to the seat temperature control restart signal detection unit 39 based on, for example, an occupant's operation of a remote controller, an occupant's operation of a control panel inside the vehicle, an occupant's operation to unlock the vehicle, or information on the location of the vehicle key.

[0042] When the temperature of the seat SE is below a predetermined temperature control target value during cooling, or when the temperature of the seat SE is above a predetermined temperature control target value during heating, the operation mode is switched to an operation mode M2 ​​other than the seat temperature control priority mode M1, and after the operation mode of the vehicle interior air conditioning unit 1 is switched to an operation mode M2 ​​other than the seat temperature control priority mode M1, the operation of the blower 20 of the seat temperature control unit 2 that is currently operating is stopped, thereby stopping the temperature control of the seat SE. Thereafter, when a seat temperature control resume signal is detected, the operation mode of the vehicle interior air conditioning unit 1 is switched back from the operation mode M2 ​​to the seat temperature control priority mode M1, and the operation of the blower 20 of the seat temperature control unit 2 is started, thereby starting the temperature control of the seat SE.

[0043] By controlling in this manner, when the temperature of the seat SE reaches a temperature control target value (e.g., a value considered comfortable) as a result of temperature control of the seat SE, the seat temperature control priority mode M1 is terminated and the system is switched to another operating mode M2. Therefore, after the heat accumulation in the seat SE is eliminated and the seat SE reaches a comfortable temperature, it becomes possible to prioritize improving the comfort of the vehicle interior A, further improving the comfort of the occupants. Furthermore, by stopping the seat temperature control unit 2 when switching to the operating mode M2, the power consumption of the seat temperature control unit 2 is reduced, enabling the vehicle air conditioning system 100 to be more energy-efficient.

[0044] Furthermore, when a seat temperature control resume signal is detected to start temperature control of the seat SE after the temperature control of the seat SE has been stopped, the seat temperature control priority mode M1 is selected again, thereby improving the comfort of the occupant when seated, even in cases where the temperature of the seat SE may rise again, for example, on a day with a lot of sunlight.

[0045] According to the vehicle air conditioning system of the present invention, it is possible to efficiently perform air conditioning of the vehicle compartment and temperature control of the seats during pre-air conditioning of the vehicle compartment.

[0046] 1...vehicle cabin air conditioning unit 2...seat temperature control unit 3...control device 10...vehicle cabin air outlet 21...ventilation duct 21a...suction side end 21b...blowout side end 30...pre-air conditioning execution unit 31...pre-air conditioning determination unit 32...interior / exterior temperature difference acquisition unit 33...heating / cooling determination unit 34...vehicle cabin air conditioning operation mode selection unit 35...seat temperature control operation instruction unit 36...seat specific information acquisition unit 37...seat temperature acquisition unit 38...seat temperature control stop instruction unit 39...seat temperature control resumption signal detection unit 100...vehicle air conditioning system A...vehicle cabin Ba...seat air inlet Fa...seat surface Fb...back surface SE...seat SEa...seat air outlet

Claims

1. A vehicle interior air conditioning unit that blows out conditioned air into a vehicle interior and includes a plurality of vehicle interior air outlets that are provided at least at different positions in the height direction of the vehicle interior and that conditions the interior of the vehicle interior; a seat temperature control unit that includes an air passage that draws in air from an intake side end that communicates with a seat intake port in the vehicle interior and blows it out from an exhaust side end that communicates with a seat outlet in the vehicle interior and that controls the temperature of a seat in the vehicle interior; and a control device that controls the vehicle interior air conditioning unit and the seat temperature control unit, wherein the control device comprises: a pre-air conditioning determination unit that determines whether pre-air conditioning for air conditioning the interior of the vehicle interior has been started by the vehicle interior air conditioning unit before a passenger gets into the vehicle; an interior / exterior temperature difference acquisition unit that acquires a value of the temperature difference between an air conditioning target temperature in the vehicle interior and an outside air temperature; a passenger compartment air conditioning operation mode selection unit that, when the pre-air conditioning has started and the temperature difference value is equal to or greater than a predetermined value, selects a seat temperature control priority mode in which air is blown out from one of the multiple passenger compartment air outlets in the passenger compartment air conditioning unit that is closest to the seat inlet in the height direction; and a seat temperature control operation instruction unit that operates the seat temperature control unit at least when the seat temperature control priority mode is selected.

2. A vehicle air conditioning system as described in claim 1, wherein in the seat temperature control unit, the suction side end of the ventilation duct is connected to the seat suction port provided below the seat surface of the seat, and the blowing side end of the ventilation duct is connected to the seat blowing port formed on the surface of the seat.

3. A vehicle air conditioning system as described in claim 1, wherein in the seat temperature control unit, the blowing side end of the ventilation duct is connected to the seat blowing outlet provided below the seat surface of the seat, and the suction side end of the ventilation duct is connected to the seat suction inlet formed on the surface of the seat.

4. The vehicle air conditioning system of claim 1, wherein the control device further has a seat information acquisition unit that acquires seat identification information for identifying the seat among the plurality of seats in which the occupant plans to sit, and the seat temperature control operation instruction unit causes the seat air conditioning unit to perform temperature control only for the seat identified by the seat information acquisition unit.

5. The control device further has a seat temperature acquisition unit that acquires the temperature of the seat, and the passenger compartment air conditioning operation mode selection unit switches to an operation mode other than the seat temperature control priority mode after selecting the seat temperature control priority mode when the temperature of the seat is below a predetermined temperature control target value during cooling by the passenger compartment air conditioning unit, or when the temperature of the seat is above a predetermined temperature control target value during heating by the passenger compartment air conditioning unit. An air conditioning system for a vehicle as described in any one of claims 1 to 4.

6. A vehicle air conditioning system as described in claim 5, wherein the control device further has a seat temperature control stop instruction unit which stops operation of the seat temperature control unit when the temperature of the seat is below a predetermined temperature control target value during the cooling operation, and when the temperature of the seat is above a predetermined temperature control target value during the heating operation.

7. The vehicle air conditioning system of claim 5, wherein the control device further has a seat temperature control restart signal detection unit that detects a seat temperature control restart signal that starts temperature control of the seat, and the passenger compartment air conditioning operation mode selection unit reselects the seat temperature control priority mode when the seat temperature control restart signal detection unit detects the seat temperature control restart signal when an operation mode other than the seat temperature control priority mode is selected.

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