Vehicle air conditioning device and vehicle air conditioning method

Abstract

To obtain a vehicular air conditioner and a vehicular air conditioning method, which can reduce power consumption while maintaining comfort.SOLUTION: A vehicular air conditioner includes: a temperature adjusting section which adjusts a temperature of taken air; and a control section which controls the temperature adjusting section. The control section acquires a medium reference temperature of the temperature adjusting section, makes a difference between the medium reference temperature and a correction value as a set temperature of the temperature adjusting section, increases the correction value as the temperature of the taken air becomes high, and reduces the correction value as the temperature of the taken air becomes low.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a vehicle air conditioner and a vehicle air conditioning method.

Background Art

[0002] Patent Document 1 discloses an air conditioner having a heat pump cycle, a heating unit, a low-temperature side heat medium circuit, and a heat radiation amount adjustment control unit. In this Patent Document 1, the heat radiation amount adjustment control unit adjusts the heat radiation amount so that the temperature of the blown air heated by the heating heat exchanger approaches the target temperature.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a structure where heat is radiated after heating for temperature adjustment, when the temperature of the taken-in air is high, extra energy is consumed to heat the air. Conversely, if the heating amount is reduced to reduce the consumed energy (power consumption), there is a risk of impairing comfort because the air cannot be heated to the temperature set by the occupant.

[0005] The present invention provides a vehicle air conditioner and a vehicle air conditioning method capable of reducing power consumption while maintaining comfort.

Means for Solving the Problems

[0006] The vehicle air conditioner according to claim 1 adjusts the temperature of the taken-in air , the heater core of the air conditioner unit and a control unit that controls the Heater core The control unit obtains the medium reference temperature, and the difference between the medium reference temperature is the reference temperature of the cooling water flowing inside the heater core and the correction value is the and is calculated based on the difference between the temperature of the intake air and the outside air temperature Heater core ​Set the set temperature, and increase the correction value as the temperature of the intake air increases, and decrease the correction value as the temperature of the intake air decreases.

[0007] In the vehicle air conditioner according to claim 1, Heater core is configured to be controlled by a control unit, and the temperature of the intake air is Heater core By adjusting, air with adjusted temperature can be blown into the vehicle interior. Here, the control unit Heater core acquires the medium reference temperature. Further, the control unit calculates the difference between the medium reference temperature and the correction value as Heater core the set temperature. Furthermore, the control unit increases the correction value as the temperature of the intake air increases. As a result, in a situation where it is not necessary to set the temperature of the medium high, such as when the intake temperature is higher than the outside air temperature, the Heater core set temperature of the medium does not increase unnecessarily, and power consumption can be reduced.

[0008] In addition, the control unit raises the set temperature as the temperature of the intake air decreases. As a result, even when low-temperature air is taken in, such as when switching from the recirculation mode to the outside air introduction mode, the air can be heated to a comfortable temperature for the occupants.

[0010] Furthermore , By correcting the Heater core set temperature based on the difference between the temperature of the intake air and the outside air temperature, the air can be heated without consuming extra energy especially when introducing outside air.

[0011] Claim 2 The vehicle air conditioner according to is, in claim to 1 wherein the control unit estimates the temperature of the intake air based on the temperature of the evaporator through which the intake air passes.

[0012] Claim 2In the vehicle air conditioner according to this, since the taken-in air passes through the evaporator, if the temperature of the taken-in air is estimated based on the temperature of the evaporator, it is not necessary to provide a dedicated thermistor or the like.

[0013] Claim 3 The vehicle air conditioner according to this is described in claim to 1 In this case, the control unit estimates the temperature of the taken-in air based on the temperature of the air in the vehicle interior, the outside air temperature, and the ratio of the air in the vehicle interior to the outside air in the taken-in air.

[0014] Claim 3 In the vehicle air conditioner according to this, particularly in the outside air introduction mode, even when there is a temperature distribution in the air passing through the evaporator, the temperature of the taken-in air can be accurately estimated.

[0015] Claim 4 The vehicle air conditioning method according to this is a vehicle air conditioning method for performing air conditioning by controlling the adjustment of the temperature of the taken-in air. In this method, the , the heater core of the air conditioner unit medium reference temperature is obtained, and the difference between the medium reference temperature and the is the reference temperature of the cooling water flowing inside the heater core correction value is set as the set temperature of the , is calculated based on the difference between the temperature of the intake air and the outside air temperature , and the correction value is increased as the temperature of the taken-in air increases. Heater core

Effect of the Invention

[0016] As described above, according to the vehicle air conditioner and the vehicle air conditioning method according to the present invention, power consumption can be reduced while maintaining comfort.

Brief Description of the Drawings

[0017] [[Figure 1]] It is a schematic diagram showing the overall configuration of the vehicle air conditioner according to the embodiment. [[Figure 2]] It is a block diagram showing the hardware configuration of the vehicle air conditioner according to the embodiment. [[Figure 3]] It is a block diagram showing the hardware configuration of the vehicle air conditioner according to the embodiment. [[Figure 4]] It is a graph showing the relationship between the target blowing temperature and the medium reference temperature. [[Figure 5]] It is a schematic diagram for explaining an example of a method for estimating the suction temperature. [[Figure 6]] It is a schematic diagram for explaining another example of a method for estimating the suction temperature. [[Figure 7]] It is a graph showing the relationship between the suction temperature, the outside air temperature, and the correction value. [[Figure 8]] It is a flowchart showing an example of the flow of air conditioning processing in the embodiment.

Mode for Carrying Out the Invention

[0018] The vehicle air conditioner 10 according to the embodiment will be described with reference to the drawings. As shown in FIG. 1, the vehicle air conditioner 10 is mounted on an electric vehicle and includes a compressor (compression machine) 12, a condenser (condenser) 14, expansion valves (expansion valves) 16A, 16B, and evaporators (evaporators) 18A, 18B, which are connected via pipes to form a refrigeration cycle. Note that the vehicle air conditioner 10 of the present embodiment will be described as an example mounted on a BEV (Battery Electric Vehicle) as an example of an electric vehicle, but it may also be mounted on a HEV (Hybrid Electric Vehicle) equipped with an engine (internal combustion engine).

[0019] In the vehicle air conditioner 10, the refrigerant is compressed when the compressor 12 is rotationally driven. The compressed refrigerant is liquefied by passing through the condenser 14, atomized by the expansion valve 16A, and sent into the evaporator 18A. Similarly, the refrigerant liquefied by passing through the condenser 14 is atomized by the expansion valve 16B and sent into the evaporator 18B.

[0020] In addition, the vehicle air conditioner 10 includes an air conditioner unit 20 as a temperature adjustment unit that is provided in an instrument panel (not shown) and adjusts the temperature of the taken-in air, and a battery cooling unit 21 that is responsible for cooling the battery 22 of the electric vehicle.

[0021] When the temperature of the battery 22 detected by a battery temperature sensor (not shown) is equal to or higher than a predetermined value, the battery cooling unit 21 cools the battery 22 by the evaporator 18B when the expansion valve 16B opens. The cooling of the battery 22 by the evaporator 18B may be an air-cooling method or a liquid-cooling method.

[0022] The air conditioner unit 20 is formed with an inside air inlet 24 that opens toward the vehicle interior and an outside air inlet 26 that opens toward the outside of the vehicle as air inlets, and an opening / closing door 28 that selectively opens and closes the inside air inlet 24 and the outside air inlet 26, and a blower fan 30 that is a blowing means.

[0023] The vehicle air conditioner 10 can be set to an inside air circulation mode that introduces the air inside the vehicle or an outside air introduction mode that introduces the air outside the vehicle as an air introduction mode for generating conditioned air. Then, the opening / closing door 28 is operated according to the set air introduction mode. Further, when the blower fan 30 is rotationally driven by the blower motor 32, the inside air or the outside air is sent to the evaporator 18.

[0024] In addition, the vehicle air conditioner 10 is provided with a defroster outlet 34, a register outlet 36, and a footwell outlet 38. The defroster outlet 34 is opened, for example, toward the front windshield glass. The register outlet 36 is opened, for example, toward the passengers inside the vehicle. The footwell outlet 38 is opened, for example, toward the feet of the passengers. Then, the inside of the air conditioner unit 20 and the vehicle interior are communicated with each other through the defroster outlet 34, the register outlet 36, and the footwell outlet 38.

[0025] The air conditioner unit 20 is provided with a mode switching door 40 that selectively opens and closes the defroster outlet 34, the register outlet 36, and the footwell outlet 38.

[0026] Here, the air conditioner unit 20 includes a heater core 42 and an air mix door 44. The heater core 42 is arranged downstream of the air for air conditioning with respect to the evaporator 18A, and heats the air passing through the heater core 42. When the electric vehicle is a BEV, the heater core 42 is heated by heating the cooling water flowing through the heater core 42 with an electric heater or the like. Further, when the electric vehicle is a HEV equipped with an engine, the heater core 42 may be heated by circulating the cooling water between the engine and the heater core 42 to perform heat exchange.

[0027] The air mix door 44 divides the air that has passed through the evaporator 18A into air that passes through the heater core 42 and air that bypasses the heater core 42. Specifically, in the air conditioner unit 20, the opening degree of the air mix door 44 is controlled according to the set air conditioning temperature, so that the air that has passed through the heater core 42 and the air that has bypassed the heater core 42 are mixed to generate the air for air conditioning.

[0028] (Hardware Configuration of Vehicle Air Conditioning Device 10) FIG. 2 is a block diagram showing the hardware configuration of the vehicle air conditioning device 10. As shown in this FIG. 2, the vehicle air conditioning device 10 includes an air conditioner ECU (Electronic Control Unit) 46 as a control unit that controls the air conditioner unit 20.

[0029] The air conditioner ECU 46 includes a CPU (Central Processing Unit: processor) 50, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 54, a storage 56, a communication I / F (communication interface) 58, and an input / output I / F (input / output interface) 60. Each component is communicably connected to each other via a bus 62.

[0030] The CPU 50 is a central processing unit that executes various programs and controls each part. That is, the CPU 50 reads a program from the ROM 52 or the storage 56 and executes the program using the RAM 54 as a work area. The CPU 50 performs control of each of the above configurations and various arithmetic processes according to the program recorded in the ROM 52 or the storage 56.

[0031] The ROM 52 stores various programs and various data. The RAM 54 temporarily stores a program or data as a work area. The storage 56 is composed of an HDD (Hard Disk Drive) or an SSD (Solid State Drive) and stores various programs including an operating system and various data. In the present embodiment, an air conditioning program for performing air conditioning and various data are stored in the ROM 52 or the storage 56.

[0032] The communication I / F 58 is an interface for the air conditioner ECU 46 to communicate with other devices. For example, standards such as CAN (Controller Area Network), Ethernet (registered trademark), LTE (Long Term Evolution), FDDI (Fiber Distributed Data Interface), Wi-Fi (registered trademark) are used.

[0033] The input / output I / F 60 is electrically connected to peripheral devices. As an example, the input / output I / F 60 of the present embodiment is electrically connected to the compressor 12, the expansion valve 16, the opening / closing door 28, the mode switching door 40, the blower fan 30, the outside air temperature sensor 64, and the evaporator temperature sensor 66.

[0034] The compressor 12 is rotationally driven by the driving force of an engine or a motor, and the cooling capacity is controlled by controlling the refrigerant discharge pressure of the compressor 12. The expansion valve 16 includes an expansion valve 16A on the air conditioner unit 20 side and an expansion valve 16B on the battery cooling unit 21 side.

[0035] The opening and closing door 28 switches between the internal air circulation mode and the outside air introduction mode by opening and closing according to the set air introduction mode. Also, the opening and closing door 28 may be controlled to introduce both the air inside the vehicle compartment and the air outside the vehicle. Actually, the air conditioner ECU 46 controls the actuator that opens and closes the opening and closing door 28.

[0036] The mode switching door 40 can be set to modes such as blowing conditioned air from the defroster outlet 34, blowing conditioned air from the register outlet 36, and blowing conditioned air from the foot outlet 38 by opening and closing according to the set mode. Actually, the air conditioner ECU 46 controls the actuator that opens and closes the mode switching door 40.

[0037] The outside air temperature sensor 64 detects the temperature outside the vehicle and transmits it to the air conditioner ECU 46. The evaporator temperature sensor 66 is provided on the evaporator 18A, detects the temperature of the evaporator 18A, and transmits it to the air conditioner ECU 46.

[0038] (Functional configuration of the vehicle air conditioner 10) The vehicle air conditioner 10 realizes various functions by using the hardware resources shown in FIG. 2. The functional configuration realized by the vehicle air conditioner 10 will be described with reference to FIG. 3.

[0039] As shown in FIG. 3, the vehicle air conditioner 10 is configured to include a set reference temperature acquisition unit 72, a suction temperature estimation unit 74, and a heater core adjustment unit 76 as functional configurations. Each functional configuration is realized by the CPU 50 reading and executing a program stored in the ROM 52 or the storage 56.

[0040] The set reference temperature acquisition unit 72 acquires the set reference temperature of the air conditioner unit 20. Specifically, the set reference temperature acquisition unit 72 calculates a target blowing temperature TAO based on the air conditioning temperature set by the occupant, and further acquires, as the set reference temperature of the air conditioner unit 20, a medium reference temperature TWO_base calculated from the target blowing temperature TAO. Here, the relationship between the target blowing temperature TAO and the medium reference temperature TWO_base will be described using the graph of FIG. 4.

[0041] The horizontal axis of FIG. 4 is the target blowing temperature TAO, and the vertical axis is the medium reference temperature TWO_base. And the target blowing temperature TAO is calculated based on the air conditioning temperature set by the occupant as described above.

[0042] As shown in the graph of FIG. 4, in the region where the target blowing temperature TAO is equal to or lower than the threshold value T1, the medium reference temperature TWO_base is constant. This corresponds to, for example, the lower limit of the set temperature of the medium. Also, in the region where the target blowing temperature TAO is equal to or higher than the threshold value T2, the medium reference temperature TWO_base is constant. This corresponds to, for example, the upper limit of the set temperature of the medium.

[0043] In the region where the target blowing temperature TAO is between the threshold value T1 and the threshold value T2, the medium reference temperature TWO_base is set so that the medium reference temperature TWO_base increases as the target blowing temperature TAO increases. In the present embodiment, as an example, since the cooling water flowing through the heater core 42 becomes the superheated medium, the medium reference temperature TWO_base becomes the reference water temperature of the cooling water.

[0044] The suction temperature estimation unit 74 shown in FIG. 3 estimates the temperature of the air taken into the heater core 42 (suction temperature). In other words, the suction temperature estimation unit 74 estimates the temperature of the air that has passed through the evaporator 18A. In the present embodiment, as an example, the suction temperature estimation unit 74 estimates the suction temperature by at least one of two methods. Hereinafter, the two methods will be described.

[0045] FIG. 5 is a schematic diagram for explaining an example of a method by which the intake temperature estimation unit 74 estimates the intake temperature. In the method shown in FIG. 5, the intake temperature is estimated using an evaporator temperature sensor 66 provided in the evaporator 18A.

[0046] Specifically, since the taken-in air passes through the evaporator 18A, the intake temperature of the taken-in air is estimated based on the temperature of this evaporator 18A. That is, since heat exchange is performed between the air and the evaporator 18A by passing through the evaporator 18A, the temperature of the evaporator 18A detected by the evaporator temperature sensor 66 is estimated as the temperature of the air taken into the heater core 42.

[0047] FIG. 6 is a schematic diagram for explaining another example of a method by which the intake temperature estimation unit 74 estimates the intake temperature. In the method shown in FIG. 6, the temperature of the air taken into the heater core 42 is estimated by another method without using the evaporator temperature sensor 66. In particular, in the method of FIG. 6, the intake temperature can be estimated with high accuracy in a state where both the air inside the vehicle compartment and the air outside the vehicle are introduced by the opening / closing door 28.

[0048] Specifically, in the method shown in FIG. 6, in a state where the air F1 introduced from the outside air inlet 26 (see FIG. 1) and the air F2 introduced from the inside air inlet 24 (see FIG. 1) are passing through the evaporator 18A, the ratio of the outside air F1 and the inside air F2 is estimated. For example, the ratio of the air F1 can be estimated from the opening degree of the opening / closing door 28 and the running state of the vehicle.

[0049] Also, assuming that the outside air temperature acquired from the outside air temperature sensor 64 is the same as the temperature of the air F1 and the temperature inside the vehicle compartment is the same as the temperature of the air F2, the temperature of the air F3 in which the air F1 and the air F2 are mixed is calculated. When the ratio of the air F1 is X (%) and the temperature of the air F1 is the outside air temperature TAM and the temperature of the air F2 is TR, the temperature T M of the air F3 is calculated as TM = TAM×X + TR×(100 - X).

[0050] The intake temperature estimation unit 74 may estimate the temperature T of the calculated air F3 as the temperature of the air taken into the heater core 42. M This may be used as the temperature of the air taken into the heater core 42.

[0051] The heater core adjustment unit 76 shown in FIG. 3 controls the temperature of the heater core 42 based on the temperature of the air estimated by the intake temperature estimation unit 74. Specifically, the heater core adjustment unit 76 sets the difference between the medium reference temperature TWO_base and the correction value as the set temperature of the heater core 42 (temperature adjustment unit), and controls the correction value to increase as the temperature of the taken-in air increases. This method of setting the temperature of the heater core 42 will be described with reference to FIG. 7.

[0052] FIG. 7 is a graph showing the relationship between the intake temperature, the outside air temperature TAM, and the correction value. The horizontal axis of FIG. 7 is the difference between the temperature of the air (intake temperature) taken into the heater core 42, estimated by the intake temperature estimation unit 74, and the outside air temperature TAM. The vertical axis of FIG. 7 is the correction value of the set temperature of the heater core 42.

[0053] As shown in the graph of FIG. 7, in the region where the difference between the intake temperature and the outside air temperature TAM is equal to or less than the threshold value T3, the correction value is constant at 0. This suppresses the correction value from becoming negative. Also, in the region where the difference between the intake temperature and the outside air temperature TAM is equal to or greater than the threshold value T4, the correction value is constant. This suppresses the correction value from becoming excessively large.

[0054] In the region where the difference between the intake temperature and the outside air temperature TAM is between the threshold value T3 and the threshold value T4, the correction value increases as the difference between the intake temperature and the outside air temperature TAM increases. In other words, the correction value is set to increase as the difference between the intake temperature and the outside air temperature TAM increases. Then, the heater core adjustment unit 76 calculates the medium set temperature TWO using the following mathematical formula using the correction value in FIG. 7 and the medium reference temperature TWO_base obtained by the set reference temperature acquisition unit 72.

[0055] (Equation 1) TWO = TWO_base - correction value ···(1)

[0056] Note that when the difference between the medium reference temperature TWO_base and the correction value is smaller than a predetermined lower limit value α, the heater core adjustment unit 76 sets the lower limit value α as the medium set temperature TWO, thereby suppressing the medium set temperature TWO from becoming an abnormal value.

[0057] According to the above formula, when the difference between the suction temperature and the outside air temperature TAM is large, it can be determined that the suction temperature is high due to internal air circulation or the like. Therefore, the heater core adjustment unit 76 sets the medium set temperature TWO lower than the medium reference temperature TWO_base.

[0058] (Function) Next, the function of the present embodiment will be described.

[0059] (Air conditioning process) An example of the flow of the air conditioning process by the vehicle air conditioner 10 will be described using the flowchart shown in FIG. 8. This process is realized by the CPU 50 reading and executing a program stored in the ROM 52 or the storage 56.

[0060] The CPU 50 acquires the medium reference temperature TWO_base in step S102. Specifically, the CPU 50 calculates the target blow-out temperature TAO based on the air conditioning temperature set by the occupant by means of the function of the set reference temperature acquisition unit 72, and further acquires the medium reference temperature TWO_base calculated from the target blow-out temperature TAO as the set reference temperature of the air conditioner unit 20.

[0061] The CPU 50 estimates the suction temperature, that is, the temperature of the air taken into the heater core 42, in step S104. Specifically, the CPU 50 estimates the temperature of the air that has passed through the evaporator 18A by means of the function of the suction temperature estimation unit 74. As a method for estimating the suction temperature, among the methods shown in FIG. 5 and FIG. 6, the suction temperature may be estimated by one method according to the vehicle state, the air conditioning mode, etc., or the suction temperature may be estimated by both methods.

[0062] The CPU 50 determines whether the difference between the suction temperature and the outside air temperature is small in step S106. Specifically, in the graph of FIG. 7, if the difference between the suction temperature and the outside air temperature TAM is equal to or less than the threshold value T3, the CPU 50 determines that the difference is small and proceeds to the process of step S108.

[0063] The CPU 50 proceeds to step S112, which is the next process, without correcting the medium set temperature TWO in step S108.

[0064] On the other hand, in the graph of FIG. 7, if the difference between the suction temperature and the outside air temperature TAM is greater than the threshold value T3, the CPU 50 proceeds to the process of step S110. The CPU 50 corrects the medium set temperature TWO according to the difference in step S110. Specifically, according to the above-described mathematical formula, the difference between TWO_base and the correction value is set as the medium set temperature TWO.

[0065] The CPU 50 determines whether the medium set temperature TWO is less than the lower limit value in step S112. If the medium set temperature TWO is less than the lower limit value, the CPU 50 proceeds to the process of step S114, sets the medium set temperature TWO to the lower limit value, and ends the air conditioning process.

[0066] On the other hand, when the medium set temperature TWO is equal to or higher than the lower limit value, the CPU 50 does not perform the process of step S114 and ends the air conditioning process with the medium set temperature TWO set in step S108 or step S110.

[0067] As described above, according to the vehicle air conditioner 10 according to the present embodiment, the air conditioner unit 20, which is a temperature adjustment unit, is configured to be controlled by the air conditioner ECU 46, and the temperature of the taken-in air is adjusted by the air conditioner unit 20 (particularly, the heater core 42) so that the temperature-adjusted air can be blown into the vehicle interior.

[0068] Here, the air conditioner ECU 46 acquires the medium reference temperature TWO_base of the heater core 42. Further, the air conditioner ECU 46 sets the medium set temperature TWO of the temperature adjustment unit to the difference between the medium reference temperature TWO_base and the correction value. Here, the air conditioner ECU 46 increases the correction value as the temperature of the taken-in air increases. Thereby, in a situation where it is not necessary to set the temperature of the medium high, such as when the taken-in temperature is higher than the outside air temperature, the medium set temperature TWO of the temperature adjustment unit does not unnecessarily increase, and power consumption can be reduced.

[0069] Also, the air conditioner ECU 46 raises the set temperature as the temperature of the taken-in air decreases. Thereby, even when low-temperature air is taken in, such as when switching from the recirculation mode to the outside air introduction mode, the air can be heated to a comfortable temperature for the occupant.

[0070] Furthermore, in the present embodiment, by correcting the medium set temperature TWO of the heater core 42 based on the difference between the temperature of the taken-in air and the outside air temperature TAM, the air can be heated without consuming extra energy particularly when introducing outside air.

[0071] Furthermore, in the present embodiment, since the taken-in air passes through the evaporator 18A, if the temperature of the taken-in air is estimated based on the temperature of the evaporator 18A, the suction temperature can be estimated using only the evaporator temperature sensor 66, and there is no need to provide a dedicated thermistor or the like.

[0072] Also, in the present embodiment, when estimating the suction temperature based on the ratio of the air in the vehicle interior and the outside air, even if there is a temperature distribution in the air passing through the evaporator 18A in the outside air introduction mode, the temperature of the taken-in air can be accurately estimated.

[0073] The vehicle air conditioner 10 according to the embodiment has been described above. However, it goes without saying that the invention can be implemented in various modes without departing from the gist of the invention. For example, in the above embodiment, the overall configuration of the vehicle air conditioner 10 has been described with reference to FIG. 1. However, the present invention is not limited to this configuration, and it may be applied to an air conditioner having another configuration. For example, instead of the heater core 42, a configuration including other heating means may be adopted.

[0074] In addition, in the above embodiment, the processing executed by the CPU 50 by reading a program may be executed by various processors other than the CPU 50. Examples of the processor in this case include a PLD (Programmable Logic Device) whose circuit configuration can be changed after manufacture, such as an FPGA (Field-Programmable Gate Array), and a dedicated electric circuit which is a processor having a circuit configuration designed specifically for executing specific processing, such as an ASIC (Application Specific Integrated Circuit). Further, the above processing may be executed by one of these various processors, or may be executed by a combination of two or more processors of the same type or different types. For example, it may be executed by a plurality of FPGAs, or a combination of a CPU and an FPGA. More specifically, the hardware structure of these various processors is an electric circuit combining circuit elements such as semiconductor elements.

[0075] In addition, in the above embodiment, various data is stored in the storage 56, but the present invention is not limited to this. For example, a non-temporary recording medium such as a CD (Compact Disk), a DVD (Digital Versatile Disk), or a USB (Universal Serial Bus) memory may be used as the storage unit. In this case, various programs and data will be stored in these recording media.

Explanation of reference numerals

[0076] 10 Vehicle air conditioner 18A Evaporator 20 Air conditioner unit (temperature adjustment unit) 46 Air conditioner ECU (control unit)

Claims

1. A heater core of an air conditioner unit that adjusts the temperature of the intake air, and a control unit that controls the heater core, comprising, the control unit obtains a medium reference temperature that is the reference temperature of the cooling water flowing inside the heater core, and sets the difference between the medium reference temperature and a correction value calculated based on the difference between the temperature of the intake air, the outside air temperature, as the set temperature of the heater core. At the same time, the correction value is increased as the temperature of the intake air increases, and the correction value is decreased as the temperature of the intake air decreases. A vehicle air conditioner.

2. The vehicle air conditioner according to claim 1, wherein the control unit estimates the temperature of the intake air based on the temperature of an evaporator through which the intake air passes.

3. The vehicle air conditioner according to claim 1, wherein the control unit estimates the temperature of the intake air based on the temperature of the air inside the vehicle compartment, the outside air temperature, and the ratio of the air inside the vehicle compartment to the outside air in the intake air.

4. A vehicle air conditioning method for performing air conditioning by controlling a heater core of an air conditioner unit that adjusts the temperature of the intake air, comprising: obtaining a medium reference temperature that is the reference temperature of the cooling water flowing inside the heater core; setting the difference between the medium reference temperature and a correction value calculated based on the difference between the temperature of the intake air, the outside air temperature, as the set temperature of the heater core, and increasing the correction value as the temperature of the intake air increases. A vehicle air conditioning method.

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