JP2006298042A - Air conditioner for vehicles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle air conditioner capable of realizing improvement of fuel consumption and securing of acceleration performance in consideration of the environment inside the vehicle.
An air conditioner relay cut APSac is set based on a temperature flag set according to a value (R / T-D / T) obtained by a temperature difference between a vehicle interior temperature R / T and a set temperature D / T. When the APS opening is larger than the air conditioner relay cut APSac, the air conditioner relay is turned off to stop the air conditioner (steps S24 to S27).
[Selection] Figure 4

Description

  The present invention relates to a vehicle air conditioner, and more particularly to control of an air conditioner having a compressor driven by an internal combustion engine.

In general, a cooling system (hereinafter referred to as an air conditioner) in a vehicle air conditioner compresses a refrigerant in a gaseous state with a compressor, liquefies it with a condenser, and vaporizes the liquefied refrigerant into gas again with an evaporator. This structure takes the heat of vaporization and cools the air inside the vehicle.
Here, the compressor is driven by the power of an internal combustion engine (hereinafter referred to as an engine). As a result, the engine load increases as the compressor is driven, leading to a problem that fuel efficiency is deteriorated and acceleration performance is also deteriorated.

Therefore, the load on the internal combustion engine is reduced by cutting off the power transmission to the compressor (compressor) by an electromagnetic clutch provided between the compressor and the engine according to the cooling performance of the air conditioner during vehicle acceleration. And the technique of ensuring sufficient acceleration performance is known (refer patent document 1).
Japanese Patent Laid-Open No. 10-193961

However, although the cooling performance of the air conditioner is considered in the above-mentioned Patent Document 1, the actual interior environment is not taken into consideration, and therefore, for example, if the cooling performance is secured, the temperature in the passenger compartment is relatively high. However, since the air conditioner is stopped by entering the acceleration state, there is a problem that cooling of the passenger compartment is delayed.
The present invention has been made to solve such a problem, and an object of the present invention is to provide a vehicle air conditioner capable of improving fuel efficiency and ensuring acceleration performance in consideration of the environment in the vehicle. It is to provide.

  In order to achieve the above object, in the vehicle air conditioner according to the first aspect, the compressor that is driven by the power of the internal combustion engine to compress the refrigerant, and that has the compressor and adjusts the temperature in the vehicle interior of the vehicle. Air-conditioning means, joint means capable of switching between transmission and disconnection of power from the internal combustion engine to the compressor, accelerator operation amount detection means for detecting the accelerator operation amount of the driver, and detecting the temperature in the passenger compartment Vehicle interior temperature detection means, vehicle interior temperature setting means for setting the temperature in the vehicle interior to a desired temperature, and when the accelerator operation amount detected by the accelerator operation amount detection means exceeds a predetermined threshold, Air-conditioning control means for controlling the power from the internal combustion engine to the compressor to be cut off by the means, the air-conditioning control means comprising the vehicle interior temperature detected by the vehicle interior temperature detection means and the vehicle interior temperature. Depending on the set the set temperature by the constant unit, and the predetermined threshold value characterized by variably setting.

Thus, during acceleration operation in which the driver's accelerator operation amount is greater than a predetermined threshold set according to the vehicle interior temperature and the set temperature, the power from the internal combustion engine to the compressor is cut off, and the internal combustion engine To reduce the load.
In the vehicle air conditioner according to claim 2, when the value obtained by the temperature difference between the vehicle interior temperature and the set temperature is less than a first predetermined value, the air conditioning control means sets the predetermined threshold value lower than normal. It is characterized by setting.

Thus, when the value obtained by the temperature difference between the passenger compartment temperature and the set temperature is less than the first predetermined value, the predetermined threshold value of the accelerator operation amount is set low, and the power from the internal combustion engine to the compressor is easily cut off. To do.
In the vehicle air conditioner according to claim 3, when the value obtained by the temperature difference between the vehicle interior temperature and the set temperature is equal to or greater than a second predetermined value greater than the first predetermined value, The predetermined threshold value is set higher than usual.

Accordingly, when the value obtained by the temperature difference between the passenger compartment temperature and the set temperature is equal to or greater than the second predetermined value, the predetermined threshold value of the accelerator operation amount is set high, and the power from the internal combustion engine to the compressor is not easily cut off. To do.
5. The vehicle air conditioner according to claim 4, wherein the air conditioning control means includes the internal combustion engine that is operated by the joint means when the accelerator operation amount detected by the accelerator operation amount detection means is greater than the predetermined threshold value. The cutting of power to the compressor is limited to a predetermined time, and the predetermined time is set according to a value obtained by a temperature difference between the vehicle interior temperature and the set temperature.

Thus, when the accelerator operation amount is larger than the predetermined threshold value, the power from the internal combustion engine to the compressor is limited only within a predetermined time set according to a value obtained by the temperature difference between the passenger compartment temperature and the set temperature. Disconnect.
6. The vehicle air conditioner according to claim 5, wherein the air conditioning control means includes the internal combustion engine that is operated by the joint means when the accelerator operation amount detected by the accelerator operation amount detection means is larger than the predetermined threshold value. When the value obtained by the temperature difference between the passenger compartment temperature and the set temperature becomes larger than a third predetermined value during the disconnection of power to the compressor, the joint means moves from the internal combustion engine to the compressor. It is characterized by switching to the transmission of power to.

  Thus, when the accelerator operation amount is larger than the predetermined threshold value and the power from the internal combustion engine to the compressor is cut off, the value obtained by the temperature difference between the vehicle interior temperature and the set temperature is larger than the third place value. If this happens, the coupling means is switched to transmit power from the internal combustion engine to the compressor.

  According to the vehicle air conditioner of the first aspect of the present invention using the above means, the predetermined threshold value for cutting the power from the internal combustion engine to the compressor is set by the vehicle interior temperature and the set temperature, so that the environment in the vehicle interior is set. The predetermined threshold value can be set in accordance with the predetermined threshold value, and the power from the internal combustion engine to the compressor is cut according to the predetermined threshold value, so that the load on the internal combustion engine can be reduced according to the environment in the passenger compartment. Improvement of acceleration and securing of acceleration performance can be realized.

  According to the vehicle air conditioner of the second aspect, when the value obtained by the temperature difference between the passenger compartment temperature and the set temperature is less than the first predetermined value, that is, when the cooling request is extremely low, the predetermined threshold is set low. By making the power from the internal combustion engine to the compressor easy to cut off, the air conditioner is stopped even during slow acceleration, etc. In this way, by increasing the opportunity to stop the air conditioner, In consideration of this environment, the load on the internal combustion engine can be further reduced, and further improvement in fuel consumption and securing of acceleration performance can be achieved.

According to the vehicle air conditioner of the third aspect, when the value obtained by the temperature difference between the passenger compartment temperature and the set temperature is equal to or higher than the second predetermined value, that is, when the cooling request is relatively high, the predetermined threshold is set high. In addition, since the power from the internal combustion engine to the compressor is hardly cut off, the operation of the air conditioner can be prioritized and the environment in the passenger compartment can be well prepared.
According to the vehicle air conditioner of the fourth aspect, it is possible to prevent a decrease in the performance of the air conditioner by limiting the power cut from the internal combustion engine to the compressor within a predetermined time.

In addition, by setting the predetermined time according to a value obtained by the temperature difference between the vehicle interior temperature and the set temperature, the length of the predetermined time can be adapted to the environment in the vehicle interior.
According to the vehicle air conditioner of claim 5, by providing the third predetermined value temperature difference, when the accelerator operation amount is equal to or greater than the predetermined threshold and the air conditioner is stopped, the cooling request is increased. However, the air conditioner can be immediately reactivated, and the environment in the passenger compartment can be maintained well.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Referring to FIG. 1, there is shown a schematic configuration diagram of a vehicle air conditioner according to the present invention.
As shown in FIG. 1, the air conditioner 1 includes a circulation flow path 6 that extends over an engine room 2 and a vehicle interior 4 of the vehicle.
The circulation channel 6 is provided with a compressor 10, a condenser 12, a receiver 14, an expansion valve 16, and an evaporator 18, and the refrigerant flows through the circulation channel 6.

Specifically, the compressor 10 sucks a gaseous refrigerant and compresses the refrigerant in a high-temperature and high-pressure state to discharge the refrigerant to the downstream side of the circulation flow path 6. That is, the compressor 10 has a function of generating a refrigerant flow while compressing the refrigerant.
The condenser 12 liquefies the refrigerant by cooling the refrigerant that has become a high temperature and a high pressure by the compressor 10.

The receiver 14 separates the refrigerant that has been liquefied by the condenser 12 from the refrigerant that has not been liquefied, and sends only the liquefied refrigerant to the downstream side of the circulation flow path 6. The receiver 14 is provided with a desiccant, a filter, and the like, and has a function of removing moisture and impurities in the refrigerant.
The expansion valve 16 decompresses the refrigerant in the low temperature and high pressure state at this time and discharges it to the evaporator 18 on the downstream side of the circulation path 6.

In the evaporator 18 provided in the passenger compartment 4, the refrigerant decompressed by the expansion valve 16 is vaporized. As described above, the refrigerant is vaporized in the evaporator 18 so that heat is removed as the heat of vaporization, the air around the evaporator 18 is cooled, and the cooled air is sent into the vehicle interior to cool the vehicle interior 4. To do.
Further, a pulley 22 is provided at one end of the compressor 16 via an electromagnetic clutch 20 (joint means), and the pulley 22 and a pulley 34 provided at one end of an output shaft 32 of the engine 30 and a belt. 36 are connected.

  The electromagnetic clutch 20 is electrically connected via an engine ECU (electronic control unit) 40 and an air conditioner relay 42. The air conditioner relay 42 is switched between connection (ON) and disconnection (OFF) in accordance with a signal from the engine ECU 40. Specifically, when the air conditioner relay 42 is turned on, the compressor 10 and the pulley 22 are connected by the electromagnetic clutch 20, and the power from the engine 30 is transmitted to the compressor 10 so that the compressor 10 operates. Cooling by the air conditioner 1 is started. On the other hand, when the air conditioner relay 42 is turned off, the compressor 10 and the pulley 22 are disconnected by the electromagnetic clutch 20, and the compressor 10 is stopped by not transmitting power from the engine 30 to the compressor 10. Cooling by is also stopped.

The engine ECU 40 is electrically connected to an APS (accelerator position sensor) 44 that detects the driver's accelerator operation amount.
Further, an air conditioner ECU 50 is provided in the vehicle interior 4, and the air conditioner ECU 50 includes a room temperature sensor 52 that detects the temperature of the vehicle interior 4 (hereinafter also referred to as room temperature), and a driver or the like for each of the air conditioners 1 and the like. An operation panel 54 for performing an operation is electrically connected. The operation panel 54 has an air conditioner switch for operating (ON) and stopping (OFF) the air conditioner 1, and various settings such as temperature, air volume, and mode. A switch is provided. For example, an ECO mode switch for running with priority given to the fuel consumption of the vehicle as a mode setting is provided.

The air conditioner ECU 50 and the engine ECU 40 are electrically connected to each other and can communicate with each other.
Hereinafter, the operation of the vehicle air conditioner according to the present invention configured as described above will be described.
2 shows a control routine for determining a temperature difference flag executed by the air conditioner ECU 50, FIG. 3 shows a control routine for a data set executed by the engine ECU 40, and FIGS. 4 and 5 show an air conditioner executed by the engine ECU 40. The control routine for relay cut is shown in the flowcharts. Hereinafter, description will be given based on these flowcharts.

First, as shown in FIG. 2, the air conditioner ECU 40 acquires the temperature R / T of the vehicle interior 4 from the room temperature sensor 52 in step S1.
In step 2, the set temperature D / T set from the operation panel 54 is acquired.
Next, in step S3, it is determined from the operation panel 54 whether or not the air conditioner switch is in an ON state. If the determination result is false (No), that is, if the air conditioner switch is OFF, the routine is exited. On the other hand, if the determination result is true (Yes), the process proceeds to step S4.

In step S4, it is determined from the operation panel 54 whether or not the ECO mode switch is ON. If the determination result is false (No), that is, if the ECO mode switch is OFF, the process proceeds to step S9. On the other hand, if the determination result is true (Yes), the process proceeds to step S5.
In step S5, is the value (R / T-D / T) obtained from the temperature difference between the room temperature R / T and the set temperature D / T less than a predetermined value A (first predetermined value) (for example, −5 ° C.)? Determine whether or not. If the determination result is true (Yes), that is, the value (R / TD / T) is less than the predetermined value A ((R / TD / T) <A), the process proceeds to step S6, and the temperature flag is set. The low temperature flag (SF) is set and transmitted to the engine ECU 40. On the other hand, if the determination result is false (No) ((R / TD−T) ≧ A), the process proceeds to step S7.

  In step S7, whether or not the value (R / T−D / T) is larger than a predetermined value B (second predetermined value) (for example, −1 ° C.) set to be larger than the predetermined value A. Is determined. When the determination result is true (Yes), that is, when the value (R / TD / T) is less than the predetermined value B (A ≦ (R / TD / T) <B), the process proceeds to step S8, and the temperature The flag is set to a temperature flag (MF) and transmitted to the engine ECU 40.

On the other hand, when the determination result is true (Yes), that is, when the value (R / TD / T) is equal to or greater than the predetermined value B ((R / TD / T) ≧ B), the determination result is also determined in step S4. If the determination is false (No), the process proceeds to step S9, where the temperature flag is set as a high temperature flag (BF) and transmitted to the engine ECU 40.
Next, as shown in FIG. 3, the engine ECU 40 first acquires temperature flag information determined by the air conditioner ECU 50 in step S10.

  In the next step S11, it is determined whether or not the acquired temperature flag is a low temperature flag (SF). If the determination result is true (Yes), the process proceeds to step S12, where the air conditioner relay 42 is turned off (hereinafter also referred to as an air conditioner relay cut) of the air conditioner relay cut APSac (predetermined threshold) that is the threshold value of the APS opening. APSs (for example, 30%) is set as the value, Ts (for example, 30 seconds) is set as the value of the air conditioner relay cut time Tac, which is the length of time for performing the air conditioner relay cut, and the process proceeds to step S13. On the other hand, if the determination result is false (No), the process proceeds directly to step S13.

  In step S13, it is determined whether or not the temperature flag acquired in step S10 is a mid-temperature flag (MF). If the determination result is true (Yes), the process proceeds to step S14, APSm (for example, 60%) is set as the value of the air conditioner relay cut APSac, and Tm (for example, 20 seconds) is set as the value of the air conditioner relay cut time Tac. Then, the process proceeds to step S15. On the other hand, if the determination result is false (No), the process directly proceeds to step S15.

  In step S15, it is determined whether or not the temperature flag acquired in step S10 is a high temperature flag (BF). If the determination result is true (Yes), the process proceeds to step S16, APSb (for example, 85%) is set as the value of the air conditioner relay cut APSac, and Tb (for example, 10 seconds) is set as the value of the air conditioner relay cut time Tac. Then, the routine is exited. On the other hand, if the determination result is false (No), the routine is directly exited.

The value of the air conditioner relay cut APSac increases in the order of APSs, APSm, APSb (APSs <APSm <APSb), and the air conditioner relay cut time Tac decreases in the order of Ts, Tm, Tb (T>Tm> Tb). And
Subsequently, as shown in FIGS. 4 and 5, the engine ECU 40 first acquires the actual APS opening degree from the APS 44 in step S20.

In the next step S21, it is determined whether or not any of a low temperature flag (SF), a mid temperature flag (MF), or a high temperature flag (BF) is set as the temperature flag. If the determination result is false (No), for example, if the air conditioner switch is in an OFF state, the routine is exited. On the other hand, if the determination result is true (Yes), the process proceeds to step S22.
In step S22, it is determined whether or not the air conditioner relay cut flag is ON. If the determination result is false (No), that is, if the air conditioner relay cut flag is OFF, the process proceeds to step S23. Since the air conditioner relay cut is not performed at the first time of the control routine, the determination result is false (No), and the process proceeds to step S23.

In step S23, it is determined whether or not the air conditioner relay 42 is in an ON state. If the determination result is false (No), for example, if the air conditioner relay is in an OFF state due to control other than the air conditioner control, the routine is exited. On the other hand, if the determination result is true (Yes), the process proceeds to step S24.
In step S24, it is determined whether or not the actual APS opening acquired in step S20 is larger than the air conditioner relay cut APSac based on the temperature flag set in the data set control. If the determination result is false (No), the routine is exited. If the determination result is true (Yes), that is, if the actual APS opening is larger than the air conditioner relay cut APSac, the process proceeds to step S25.

In step S25, the air conditioner relay cut flag is turned ON, and in step S26, the air conditioner relay is turned OFF. In step S27, the air conditioner relay cut timer is started and the routine is exited.
When the air conditioner relay cut is executed, the determination result in step S22 becomes true (Yes), and the process proceeds to step S30.

In step S30, it is determined whether or not the actual APS opening is larger than APSac. If the determination result is true (Yes), that is, if the acceleration state continues, the process proceeds to step S31.
In step S31, it is determined whether or not the air conditioner relay cut time Tac corresponding to the temperature flag has elapsed since the air conditioner relay cut timer was turned on. If the determination result is false (No), that is, if the air conditioner relay cut time Tac has not yet elapsed, the process proceeds to step S32.

  In step S32, a value (R / T−D / T) obtained by the temperature difference between the room temperature R / T and the set temperature D / T from the air conditioner ECU 50 is set to a predetermined value C (which is set to be larger than the predetermined value B). For example, it is determined whether the temperature is higher than 4 ° C.). That is, it is determined whether or not the room temperature R / T has risen by executing the air conditioner relay cut and stopping the air conditioner 1. If the determination result is false (No) ((R / TD−T) ≦ C), the routine is exited. On the other hand, if the determination result is true (Yes) ((R / TD−T)> C), the process proceeds to step S40.

In step S40, the air conditioner relay cut flag is turned OFF, and in step S41, the air conditioner relay is turned ON. In step S42, the air conditioner relay cut timer is stopped, and the process returns to step S32.
Then, the determination in step 32 is repeated until the value (R / T−D / T) becomes equal to or less than the predetermined value C. When the determination becomes true (Yes), the routine is returned. That is, if the value (R / T-D / T) becomes larger than the predetermined value C during execution of the air conditioner relay cut, even if the APS opening is larger than the air conditioner relay cut APSac, the air conditioner relay cut time. Even within Tac, the air conditioner relay cut is not performed until the temperature becomes equal to or less than the predetermined value C, and the air conditioner 1 is operated to suppress an increase in the passenger compartment temperature.

Further, when the APS opening becomes equal to or less than the predetermined threshold value APSac or the air conditioner relay cut time Tac has elapsed during execution of the air conditioner relay cut, that is, the determination result in step S30 is false (No), or the determination result in step S31. If is true (Yes), the process proceeds to step S50.
In step S50, the air conditioner relay cut flag is turned OFF, and in step S51, the air conditioner relay is turned ON. In step S52, the air conditioner relay cut timer is stopped and the routine is exited.

  By controlling the air conditioner relay cut as described above, the air conditioner relay cut APSac is set to be low when the cooling request is extremely low such that the value (R / T-D / T) is smaller than the predetermined value A. By making the air-conditioner relay cut easier, the air-conditioner 1 can be stopped even at a slow acceleration, etc., and the opportunity to reduce the load on the internal combustion engine can be increased to actively improve fuel efficiency and ensure acceleration performance. Can be planned. For example, when the predetermined value A = −5 is set, when the value (R / T−D / T) <− 5, the room temperature R / T is much lower than the target temperature D / T, that is, the cooling requirement is extremely low. For this reason, the air conditioner 1 is stopped even in a slow acceleration, etc., and the supercooling is suppressed to improve the fuel consumption and secure the acceleration performance.

  Further, in a state where there are some cooling requests where the value (R / T-D / T) is equal to or greater than the predetermined value B, the air conditioner relay cut APSac is set high to make it difficult to perform the air conditioner relay cut. Thus, the operation of the air conditioner 1 can be prioritized and the environment in the passenger compartment can be well prepared. For example, when the predetermined value B is set to −1 ° C., and −1 ≦ value (R / T−D / T), the room temperature R / T is lower than the target temperature D / T, but the room temperature R / T and the target Since the temperature D / T is not so far away, that is, the cooling request is relatively high, the operation of the air conditioner 1 is prioritized to suppress the temperature rise in the passenger compartment.

Also, by setting the air conditioner relay cut time Tac, it is possible to prevent the performance of the air conditioner 1 from being deteriorated.
The air conditioner relay cut time Tac is set according to the value (R / TD / T). For example, when the value (R / TD / T) is large, the air conditioner relay cut time Tac is Priority is given to maintaining the cooling performance of the air conditioner by shortening, or when the value (R / T-D / T) is small, the air conditioner relay cut time Tac is lengthened to give priority to fuel consumption and acceleration performance, etc. It is possible to make the time length suitable for the situation.

Further, even when the APS opening is equal to or greater than the air conditioner relay cut APSac and within the air conditioner relay cut time Tac, the value (R / TD−T) is increased by stopping the air conditioner 1 by performing the determination based on the predetermined value C. Even if it becomes, since the air conditioner 1 can be operated again at an early stage, the environment in the passenger compartment can be maintained well.
Further, in the determination of the acceleration state, by setting the air conditioner relay cut APSac according to the vehicle interior temperature and the set temperature, the air conditioner relay cut according to the environment in the vehicle interior can be performed, and the air conditioner relay cut is performed. This can reduce the engine load, improve fuel efficiency and ensure acceleration performance.

Although the description about embodiment of the vehicle air conditioner concerning this invention is finished above, embodiment is not restricted to the said embodiment.
For example, in the above-described embodiment, the air conditioner relay cut control is performed based on the vehicle interior temperature and the set temperature only in the ECO mode. However, the control is always performed without providing other conditions or special conditions. It may be.

In the above-described embodiment, the predetermined values A, B, and C are set. However, the predetermined values A, B, and C are not limited to these three levels, and more predetermined levels may be set. Alternatively, for example, a temperature difference and a predetermined threshold value may be set. A map that stores the relationship between and may be set in advance.
In the above embodiment, the air conditioner relay cut time Tac is set, but the air conditioner relay cut is continued until the APS opening becomes equal to or less than the air conditioner relay cut APSac without setting the air conditioner relay cut time Tac. It doesn't matter.

In the above embodiment, the air conditioner relay cut is canceled when the value (R / T-D / T) becomes larger than the predetermined value C during the air conditioner relay cut. The air conditioner relay cut may be continued until the opening becomes equal to or less than the air conditioner relay cut APSac.
Furthermore, in the above embodiment, the predetermined values A and B are set to negative values in which the room temperature is lower than the set temperature, but the room temperature may be set to a positive value higher than the set temperature.

It is a schematic block diagram of the vehicle air conditioner which concerns on this invention. It is a flowchart which shows the control routine which determines the temperature difference flag which air-conditioner ECU in the vehicle air conditioner which concerns on this invention performs. It is a flowchart which shows the control routine of the data set which engine ECU in the vehicle air conditioner which concerns on this invention performs. It is a part of flowchart which shows the control routine of the air-conditioner relay cut which engine ECU in the vehicle air conditioner which concerns on this invention performs. FIG. 5 is the remaining part of the flowchart showing the control routine following FIG. 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Engine room 4 Car interior 6 Circulation flow path 10 Compressor 20 Electromagnetic clutch (joint means)
30 engine (internal combustion engine)
40 Engine ECU (air conditioning control means)
42 Air Conditioning Relay 44 APS (Accelerator Operation Amount Detection Means)
50 Air conditioner ECU (air conditioning control means)
52 Room temperature sensor (Vehicle interior temperature detection means)
54 Operation panel (vehicle compartment temperature setting means)

Claims (5)

A compressor that compresses the refrigerant driven by the power of the internal combustion engine;
Air-conditioning means for adjusting the temperature in the passenger compartment of the vehicle having the compressor;
Coupling means capable of switching between transmission and disconnection of power from the internal combustion engine to the compressor;
An accelerator operation amount detection means for detecting the driver's accelerator operation amount;
Vehicle interior temperature detecting means for detecting the temperature in the vehicle interior;
Vehicle interior temperature setting means for setting the temperature in the vehicle interior to a desired temperature;
An air-conditioning control unit that controls the joint unit to cut power from the internal combustion engine to the compressor when the accelerator operation amount detected by the accelerator operation amount detection unit exceeds a predetermined threshold;
The air conditioning control means variably sets the predetermined threshold according to the vehicle interior temperature detected by the vehicle interior temperature detection means and the set temperature set by the vehicle interior temperature setting means. Air conditioner.   The air conditioning control means sets the predetermined threshold value lower than normal when a value obtained by a temperature difference between the passenger compartment temperature and the set temperature is less than a first predetermined value. The vehicle air conditioner described.   The air conditioning control means sets the predetermined threshold higher than normal when a value obtained by a temperature difference between the vehicle interior temperature and the set temperature is equal to or greater than a second predetermined value greater than the first predetermined value. The vehicle air conditioner according to claim 2. The air conditioning control means is configured to perform predetermined power cutting from the internal combustion engine to the compressor performed by the joint means when the accelerator operation amount detected by the accelerator operation amount detection means is greater than the predetermined threshold. Limited in time,
The vehicle air conditioner according to any one of claims 1 to 3, wherein the predetermined time is set according to a value obtained by a temperature difference between the vehicle interior temperature and the set temperature. The air-conditioning control means is configured to release power from the internal combustion engine to the compressor performed by the joint means when the accelerator operation amount detected by the accelerator operation amount detection means is greater than the predetermined threshold value. ,
When the value obtained by the temperature difference between the passenger compartment temperature and the set temperature is greater than a third predetermined value, the joint means switches to transmission of power from the internal combustion engine to the compressor. The vehicle air conditioner according to any one of claims 1 to 4.

Images