JP2004203289A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner 2 for a vehicle furnished with a refrigerating cycle 3 to air-cool a refrigerant by an outdoor heat exchanger 4 and an EV radiator 6 to air-cool cooling water (EV cooling water) of an electric part 91, capable of restricting refrigerating capacity of the refrigerating cycle 3 in order to maintain EV refrigerating temperature at lower than 65°C. <P>SOLUTION: An air conditioning control means to lower the refrigerating capacity of the refrigerating cycle 3 (for example, to change over to an inner air circulating mode, to lower rotating speed of a compressor 31 by specified quantity, etc.) is carried out in the case when temperature of the EV cooling water detected by a water temperature sensor 94 is higher than a set value (65°C). Consequently, heat is absorbed from the air conditioning air by the refrigerating cycle 3 and a heating value to be released to air-cooling air is reduced. Accordingly, it is possible to lower temperature of the air-cooling air to air-cool the EV cooling water and to lower the EV cooling water at less than 65°C. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to air conditioning control means for adjusting the refrigeration capacity of a refrigeration cycle in an air conditioner for a vehicle having a motor for traveling, and more particularly to air cooling of a radiator for cooling cooling water for cooling electric components mounted on the vehicle. The present invention relates to an air-conditioning control unit that limits a refrigeration capacity in order to maintain a capacity at or above a certain level.
[0002]
[Prior art]
Conventionally, in a refrigeration cycle of a vehicle having a traveling motor, for example, a hybrid vehicle having a traveling engine together with a traveling engine, an outdoor heat exchanger that radiates heat absorbed by a refrigerant from air introduced into a vehicle compartment by air cooling, A radiator that cools cooling water for cooling electric components mounted on the hybrid vehicle (hereinafter referred to as an EV radiator) is a radiator that cools cooling water for cooling a traveling engine (hereinafter referred to as an engine radiator). In general, they are arranged in series in the flow direction of the air-cooled air (for example, see Patent Document 1). In addition, there is a method in which the rotation speed of an air-cooling fan is controlled in accordance with the temperature of the electric component in order to keep the temperature of the cooling water for cooling the electric component at or below a predetermined value (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP-A-2002-187435 (pages 5-8, FIG. 1)
[Patent Document 2]
JP-A-2002-223505 (pages 3-5, FIG. 2)
[0004]
[Problems to be solved by the invention]
In recent years, as disclosed in Patent Literature 1 or Patent Literature 2, three types of outdoor heat exchangers, EV radiators, and engine radiators are not arranged in series in the flow direction of air-cooled air as in Patent Literature 1 or Patent Literature 2 due to the demand for space saving in hybrid vehicles. , An EV radiator and an engine radiator are integrated into an integrated radiator, and two outdoor heat exchangers and an integrated radiator are arranged in series in the flow direction of the air-cooled air.
Here, the temperature of the cooling water for cooling the engine (hereinafter, referred to as engine cooling water) is allowed up to 110 ° C., so that air that has received heat from the refrigerant in the outdoor heat exchanger can be sufficiently air-cooled. . However, the temperature of the cooling water for cooling the electric components (hereinafter referred to as EV cooling water) is only allowed up to 65 ° C. in order to protect the electric components. There is a possibility that the air cannot be cooled down to 65 ° C.
[0005]
[Object of the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner for a vehicle equipped with a refrigeration cycle for air-cooling a refrigerant in an outdoor heat exchanger and an EV radiator. An object of the present invention is to provide a vehicle air conditioner that can be restricted.
[0006]
[Means for Solving the Problems]
[Means of claim 1]
According to the first aspect of the present invention, a refrigeration cycle mounted on a vehicle having a traveling motor and having an outdoor heat exchanger for air-cooling refrigerant, and a downstream side of the outdoor heat exchanger in a flow direction of air-cooled air from the outdoor heat exchanger An EV radiator that is arranged in series and cools an EV cooling water that cools electric components mounted on the vehicle, a cooling water temperature detecting unit that detects a temperature of the EV cooling water flowing out of the EV radiator, An air-conditioning control unit that reduces the refrigeration capacity of the refrigeration cycle when the temperature of the EV cooling water detected by the water temperature detection unit is equal to or higher than a set value.
Accordingly, when the temperature of the EV cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value (for example, 65 ° C.), the amount of heat pumped up by the refrigeration cycle and released to the air-cooled air is reduced. For this reason, the temperature of the air-cooled air that cools the EV cooling water can be reduced, and the temperature of the EV cooling water can be reduced to 65 ° C. or less.
[0007]
[Means of Claim 2]
According to a second aspect of the present invention, there is provided an evaporator disposed in a duct for guiding air into a vehicle cabin to cool the air with a refrigerant, and the air-conditioning control unit detects the EV cooling water detected by the cooling water temperature detecting unit. When the temperature is equal to or higher than the set value, the amount of heat absorbed by the refrigerant in the evaporator is reduced.
Thus, when the temperature of the EV cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value (for example, 65 ° C.), the amount of heat absorbed by the refrigerant in the evaporator decreases, and accordingly, the outdoor heat exchanger The amount of heat released from the refrigerant to the air-cooled air in the air is reduced. Therefore, the same effect as the first aspect can be obtained.
[0008]
[Means of Claim 3]
The invention according to claim 3 includes an inside / outside air switching door that switches between an outside air introduction mode in which air guided into the duct is introduced from outside the vehicle room and an inside air circulation mode in which air is circulated from the vehicle room, and the air conditioning control means includes a cooling unit. When the temperature of the EV cooling water detected by the water temperature detection means is equal to or higher than a set value, the inside / outside air switching control means switches the inside / outside air switching door to the inside air circulation mode.
Thereby, when the temperature of the EV cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value (for example, 65 ° C.), the air (inside air) in the vehicle room once cooled is guided to the evaporator. , The amount of heat absorbed by the refrigerant in the outdoor heat exchanger decreases, and accordingly, the amount of heat released from the refrigerant to the air-cooled air in the outdoor heat exchanger decreases. Therefore, the same effect as the first aspect can be obtained.
[0009]
[Means of Claim 4]
According to a fourth aspect of the present invention, the air conditioning control means reduces the amount of heat released from the refrigerant in the outdoor heat exchanger when the temperature of the EV cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value. Features.
Thus, when the temperature of the EV cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value (for example, 65 ° C.), the amount of heat released from the refrigerant to the air-cooled air in the outdoor heat exchanger is reduced. Therefore, the same effect as the first aspect can be obtained.
[0010]
[Means of claim 5]
The invention according to claim 5 is provided with a compressor that compresses the refrigerant and discharges the refrigerant to the outdoor heat exchanger, wherein the air-conditioning control unit is configured to perform the operation when the temperature of the EV cooling water detected by the cooling water temperature detecting unit is equal to or higher than a set value. In addition, it is a compressor control means for limiting the discharge amount of the compressor.
Accordingly, when the temperature of the EV cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value (for example, 65 ° C.), the amount of the refrigerant discharged to the outdoor heat exchanger is limited, so that the outdoor heat exchanger is restricted. The amount of heat released from the refrigerant to the air-cooled air in the exchanger is reduced. Therefore, the same effect as the first aspect can be obtained.
[0011]
[Means of claim 6]
According to a sixth aspect of the present invention, the first compressor control means inhibits an increase in the rotation speed of the compressor when the temperature of the EV cooling water detected by the cooling water temperature detection means is equal to or higher than a set value. And a combination of one or more of a second compressor control means for lowering the rotation speed of the compressor by a predetermined amount and a third compressor control means for stopping the compressor.
Thereby, if a plurality of set values for the temperature of the EV cooling water detected by the cooling water temperature detecting means are set in a stepwise manner, the amount of the refrigerant discharged to the outdoor heat exchanger is limited according to each step. The amount of heat released from the refrigerant to the air-cooled air in the outdoor heat exchanger decreases stepwise. For this reason, the temperature of the air-cooled air for air-cooling the EV cooling water can be gradually reduced, and control according to the urgency can be performed.
[0012]
[Means of claim 7]
According to a seventh aspect of the present invention, there is provided an evaporator which is disposed in a duct for guiding air into a vehicle compartment and cools the air with a refrigerant, and an outside air introduction mode for introducing the air to be introduced into the duct from outside the vehicle compartment. An internal / external air switching door for switching to any of internal air circulation modes for circulating air from the air, and a compressor for compressing refrigerant and discharging the refrigerant to the outdoor heat exchanger. Inside / outside air switching control means for switching the inside / outside air switching door to the inside air circulation mode when the temperature of the water is equal to or higher than the set value, first compressor control means for inhibiting increase in the rotation speed of the compressor, reduction of the rotation speed of the compressor by a predetermined amount Combination of any two or more of the second compressor control means for stopping the compressor and the third compressor control means for stopping the compressor And characterized in that the.
Thereby, if a plurality of set values for the temperature of the EV cooling water detected by the cooling water temperature detecting means are set stepwise, the amount of the refrigerant discharged to the outdoor heat exchanger according to each step, or the amount of the refrigerant in the evaporator Since the amount of heat absorbed by the refrigerant is reduced, the amount of heat released from the refrigerant to the air-cooled air in the outdoor heat exchanger is reduced stepwise. Therefore, the same effect as that of the sixth aspect is obtained.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
[Configuration of First Embodiment]
The configuration of the first embodiment of the present invention will be described with reference to FIG. The vehicle air conditioner 2 according to the first embodiment is disposed at the forefront of the vehicle interior 15 of the hybrid vehicle 1 having a traveling engine 81 and a traveling motor (not shown), and is blown into the vehicle interior 15. An air-conditioning unit 5 that air-conditions air (hereinafter, referred to as conditioned air), circulates a refrigerant into the air-conditioning unit 5, cools the conditioned air, absorbs heat, and radiates heat to the air (running wind) introduced as air-cooled air. An air-conditioning controller (hereinafter referred to as an ECU) having a refrigeration cycle 3 and a well-known central processing unit (CPU), a ROM, a standby RAM, and the like, and performing arithmetic processing by a control program stored in the ROM based on various input signals. (Neither is shown).
[0014]
The air conditioning unit 5 includes a duct 51 forming an air passage for guiding conditioned air toward the vehicle interior 15. The most upstream portion of the duct 51 is driven by an inside / outside air switching actuator (not shown) such as a servo motor controlled by an ECU, and circulates air from the inside or outside air introduction mode in which conditioned air is introduced from outside the vehicle compartment. An inside / outside air switching door 52 for switching to any of the inside air circulation modes is provided.
Downstream of the inside / outside air switching door 52, there is provided a blower 53 that introduces vehicle interior air (inside air) or outside air (outside air) through the inside / outside air switching door 52 and blows the air into the duct 51 as conditioned air. .
[0015]
An evaporator (cooling indoor heat exchanger) 33 that forms a part of the refrigeration cycle 3 and cools the conditioned air is provided downstream of the blower 53 over the entire surface of the duct 51, and downstream of the evaporator 33, A heater core (heating indoor heat exchanger) 54, which forms part of an engine cooling water circuit 8 described later and heats the conditioned air cooled by the evaporator 33 with the engine cooling water, is provided. In the heater core 54, the ratio between the flow rate of the conditioned air that bypasses the heater core 54 and the flow rate of the conditioned air that passes through the heater core 54 is adjusted according to the target temperature of the conditioned air blown into the vehicle interior 15 by the door opening. An air mix door 55 is provided.
[0016]
Downstream of the heater core 54 and the air mixing door 55, an air outlet passage for guiding the conditioned air to each of the air outlets leading to the vehicle interior 15 is provided, and the cool air mainly flows from the front of the vehicle interior 15 toward the head and chest of the occupant. Face outlet 56 for leading to a face outlet (not shown) for blowing air, a foot outlet passage 57 for leading to a foot outlet (not shown) for mainly blowing warm air toward the feet of the occupant, and front. A defroster outlet passage 58 is provided to guide a hot air to a defroster outlet (not shown) that mainly blows toward the glass.
[0017]
The refrigeration cycle 3 includes a compressor 31 that absorbs heat from the conditioned air by the evaporator 33 and compresses the vaporized gas refrigerant into an easily liquefied state (that is, high temperature and high pressure) and discharges the gas refrigerant. The outdoor heat exchanger 4 which is liquefied by the wind to be a liquid refrigerant, the refrigerant expansion valve 32 which rapidly expands the high-pressure liquid refrigerant and injects it as a low-temperature mist refrigerant, and absorbs the heat of vaporization of the refrigerant from the conditioned air. An evaporator 33 for cooling is provided, and the compressor 31, the outdoor heat exchanger 4, the refrigerant expansion valve 32, and the evaporator 33 are connected by a refrigerant pipe 34 so that the refrigerant flows in this order.
[0018]
The outdoor heat exchanger 4 is arranged at the forefront in the engine room 11 of the hybrid vehicle 1, and a front grill 12 for guiding the traveling wind as air-cooled air into the engine room 11 is provided in front of the outdoor heat exchanger 4. 13 and below the front end of the bonnet 14. On the downstream side of the outdoor heat exchanger 4 in the flow direction of the air-cooled air, an engine radiator 84 for air-cooling the engine cooling water for cooling the traveling engine 81 and an engine radiator below the engine radiator 84 in the vertical direction. An integrated radiator 7 having an EV radiator 6 that is arranged in parallel with 84 and has an EV radiator 6 that air-cools EV cooling water that cools an electric component 91 mounted on the hybrid vehicle 1 is arranged in series. On the downstream side of the integrated radiator 7 in the flow direction of the air-cooled air, the outdoor radiator 7 is disposed in series with the outdoor heat exchanger 4 and the integrated radiator 7, and the traveling wind is air-cooled through the front grill 12 into the engine room 11. , An air cooling fan 35 is provided.
[0019]
The electric component 91 converts the DC power of the vehicle-mounted main battery (not shown) into a predetermined three-phase AC power, and further converts the three-phase AC power according to a command from an engine control device (not shown). An inverter (not shown) for a traveling motor that outputs to a traveling motor and controls the rotation speed of the traveling motor, and down-converts the DC power of a vehicle-mounted main battery to a predetermined DC power and is mounted on the hybrid vehicle 1 A DC / DC converter (not shown) for outputting to an auxiliary battery (not shown) for operating the auxiliary equipment and charging the auxiliary battery, and converting the DC power of the auxiliary battery to a predetermined three-phase AC power. Further, the three-phase AC power is converted in accordance with a command from the ECU and output to a drive motor (not shown) of the compressor 31 to control the rotation speed of the compressor 31 and the like.
[0020]
The EV radiator 6 constitutes the EV cooling water circuit 9 together with the electric component 91 and an EV cooling water pump 92 for providing power for circulating the EV cooling water. The EV cooling water pump 92, the electric component 91, and the EV radiator 6 are arranged in this order. The EV cooling water is connected by an EV cooling water pipe 93 so that the EV cooling water flows. On the EV cooling water outlet side of the EV radiator 6, a water temperature sensor 94 is provided as cooling water temperature detecting means for detecting the temperature of the EV cooling water flowing out of the EV radiator 6.
On the other hand, the engine radiator 84 includes an engine cooling water circuit 8 together with a traveling engine 81, a heater core 54 provided in the air conditioning unit 5 for heating conditioned air, an engine cooling water pump 82 for providing power for circulating engine cooling water, and the like. The engine cooling water pump 82, the running engine 81, the heater core 54, the running engine 81, and the engine radiator 84 are connected by an engine cooling water pipe 83 so that the engine cooling water flows in this order.
[0021]
The ECU executes the following control method based on various input signals from the water temperature sensor 94 and the like, so that the control program stored in the ROM or the like uses the control program stored in the ROM or the like to switch between the inside and outside air such as a servo motor that drives the inside and outside air switching door 52. And an air conditioner inverter for controlling the rotation speed of the compressor 31.
[0022]
[Control Method of First Embodiment]
The control method according to the first embodiment will be described with reference to the flowchart shown in FIG. In the control method according to the first embodiment, when the value detected by the water temperature sensor 94 (indicated by Tw in FIG. 2) is equal to or greater than a set value (65 ° C.) (step S11), the inside / outside air switching door 52 is first opened. The inside / outside air switching control means for switching to the circulation mode is performed to reduce the amount of heat absorbed from the conditioned air to the refrigerant in the evaporator 33 (step S13). After waiting for one minute (step S14), if the detected value is equal to or higher than 65 ° C. (step S15), the second compressor control means for lowering the rotation speed of the compressor 31 by a predetermined amount (500 rpm) is performed, and the discharge of the compressor 31 is performed. The amount is limited to reduce the amount of heat released from the refrigerant in the outdoor heat exchanger 4 (step S17). After waiting for one minute (step S18), the process returns to step S11. If the detected value is smaller than 65 ° C. in step S11 or S15, the normal control is performed (step S12 or step S16), and the process returns to step S11.
[0023]
[Operation of First Embodiment]
In the air conditioning unit 5, all of the conditioned air introduced into the duct 51 by the blower 53 through the inside / outside air switching door 52 passes through the evaporator 33, is deprived of heat as heat of vaporization of the refrigerant, and is cooled. Part of the cooled conditioned air passes through the heater core 54 via the air mix door 55 and is heated by engine cooling water. The opening of the air mix door 55 is determined according to the target temperature of the conditioned air blown into the vehicle interior 15. The conditioned air heated by the heater core 54 is mixed with the conditioned air that has bypassed the heater core 54, and is blown into the vehicle interior 15 from each of the outlets through the face outlet passage 56, the foot outlet passage 57, or the defroster outlet passage 58. .
[0024]
In the refrigeration cycle 3, the high-temperature and high-pressure gas refrigerant discharged by the compressor 31 gives heat to the air-cooled air introduced by the air-cooling fan 35 via the front grill 12 in the outdoor heat exchanger 4, and liquefies to become a liquid refrigerant. . The liquid refrigerant is mist-expanded and injected by the refrigerant expansion valve 32 and flows to the evaporator 33, where the liquid refrigerant takes heat from the conditioned air and evaporates. After that, it is compressed again to a high temperature and high pressure by the compressor 31 and the cycle is repeated.
[0025]
In the engine cooling water circuit 8, the engine cooling water discharged by the engine cooling water pump 82 is sent to the traveling engine 81 to cool the traveling engine 81. After that, the engine cooling water is sent to the heater core 54 to heat the conditioned air, then sent to the engine radiator 84, air-cooled by the air-cooled air that has passed through the outdoor heat exchanger 4, and discharged again by the engine cooling water pump 82. .
In the EV cooling water circuit 9, the cooling water discharged by the EV cooling water pump 92 is sent to the electric component 91 to cool the electric component 91. Thereafter, the EV cooling water is air-cooled by the EV radiator 6 by the air-cooled air that has passed through the outdoor heat exchanger 4, and is again discharged by the EV cooling water pump 92.
Here, the water temperature sensor 94 detects the temperature of the EV cooling water flowing out of the EV radiator 6, and controls the refrigeration capacity of the refrigeration cycle 3 using the above-described air conditioning control means based on the detected value. Thus, the amount of heat absorbed from the conditioned air to the refrigerant in the evaporator 33 or the amount of heat released from the refrigerant to the air-cooled air (atmosphere) in the outdoor heat exchanger 4 is controlled.
[0026]
[Effects of First Embodiment]
As described above, the refrigeration cycle 3 having the outdoor heat exchanger 4 that is mounted on the vehicle having the traveling motor and cools the refrigerant is serially arranged downstream of the outdoor heat exchanger 4 in the flow direction of the air-cooled air. , An EV radiator 6 for air-cooling an EV cooling water for cooling an electric component 91 mounted on the vehicle, a water temperature sensor 94 for detecting a temperature of the EV cooling water flowing out of the EV radiator 6, and a water temperature sensor 94. If the temperature of the EV cooling water detected by the above is equal to or higher than the set value (65 ° C.), the air conditioning control means for lowering the refrigeration capacity of the refrigeration cycle 3 is performed.
Accordingly, when the temperature of the EV cooling water detected by the water temperature sensor 94 is equal to or higher than the set value, the amount of heat absorbed from the conditioned air by the refrigeration cycle 3 and radiated to the air-cooled air (atmosphere) decreases. For this reason, the temperature of the air-cooled air that cools the EV cooling water can be reduced, and the temperature of the EV cooling water can be reduced to 65 ° C. or less.
[0027]
[Control Method of Second Embodiment]
A control method according to the second embodiment will be described with reference to the flowchart shown in FIG. In the control method according to the second embodiment, when the value detected by the water temperature sensor 94 (indicated by Tw in FIG. 3) is equal to or greater than a set value (65 ° C.) (step S21), the third compressor control for stopping the compressor 31 is performed. Then, the discharge of the refrigerant from the compressor 31 is stopped to stop the heat radiation from the refrigerant in the outdoor heat exchanger 4 (step S23). After waiting for one minute (step S24), the process returns to step S21. If the detected value is smaller than 65 ° C. in step S21, the normal control is performed (step S22), and the process returns to step S21.
[0028]
[Effect of Second Embodiment]
As described above, when the temperature of the EV cooling water detected by the water temperature sensor 94 is equal to or higher than the set value (65 ° C.), the amount of heat absorbed from the conditioned air by the refrigeration cycle 3 and radiated to the air-cooled air (atmosphere) is reduced. Therefore, the temperature of the air cooling air for cooling the EV cooling water can be reduced, and the temperature of the EV cooling water can be reduced to 65 ° C. or less.
[0029]
[Control Method of Third Embodiment]
The control method according to the third embodiment will be described with reference to the flowchart shown in FIG. In the control method according to the third embodiment, in steps S31, S33, S35, and S37, it is determined which of the zones A to E shown in FIG. 5 the detection value (represented by Tw in FIG. 4) of the water temperature sensor 94 falls. I do. Here, the zones A to E have a higher urgency in the order of E, D, C, B, and A, and require a greater reduction in refrigeration capacity.
[0030]
First, when the detected value is in the A zone (less than 55 ° C.) (NO in step S31), normal control is performed (step S32). If the detected value is in the B zone (55 ° C. or higher and lower than 60 ° C.) (NO in step S33), the above-described inside / outside air switching control unit is performed (step S34). When the detected value is in the C zone (60 ° C. or more and less than 65 ° C.) (NO in step S35), the first compressor control unit that inhibits the increase in the rotation speed of the compressor 31 is performed, and the discharge of the compressor 31 is performed. The amount of heat released from the refrigerant in the outdoor heat exchanger 4 is reduced by limiting the amount (step S36). If the detected value is in the D zone (65 ° C. or more and less than 70 ° C.) (NO in step S37), the above-described second compressor control unit is performed (step S38). If the detected value is in the E zone (70 ° C. or higher) (YES in step S37), the above-described third compressor control unit is performed (step S39).
After performing the steps S32, S34, S36, S38, and S39, the process returns to step S31 after waiting for one minute (step S40).
[0031]
[Effects of Third Embodiment]
As described above, if a plurality of set values for the temperature of the EV cooling water detected by the water temperature sensor 94 are set in stages, the amount of refrigerant discharged to the outdoor heat exchanger 4 or the evaporator 33 in each stage The amount of heat absorbed by the refrigerant in the outdoor heat exchanger 4 can be reduced stepwise. For this reason, the temperature of the air-cooled air for air-cooling the EV cooling water can be gradually reduced, and control according to the urgency can be performed.
[0032]
[Other embodiments]
In the present embodiment, the present invention is applied to the hybrid vehicle 1 having the traveling motor and the traveling engine 81. However, the present invention may be applied to a railway vehicle, an electric vehicle, or the like that travels only with the traveling motor.
[0033]
In this embodiment, the outdoor heat exchanger 4 is disposed so as to face the entire front surface of the integrated radiator 7. However, the outdoor heat exchanger 4 is not opposed to the front surface of the EV radiator 6, The EV cooling water may be air-cooled by air-cooled air that does not receive heat radiation from the refrigerant. Further, the portion of the outdoor heat exchanger 4 facing the EV radiator 6 has a smaller fin pitch and a smaller tube pitch to reduce the heat transfer capability, so that the temperature of the air-cooled air guided to the EV radiator 6 is hardly increased. You may. Further, a shroud having a duct function is provided around the outdoor heat exchanger 4 and the integrated radiator 7 in order to prevent dispersion of the air-cooled air and intensively guide the air-cooled air to the outdoor heat exchanger 4 and the integrated radiator 7. If it is necessary to enclose the air-cooled air in the outdoor heat exchanger 4, the temperature of the air-cooled air guided to the EV radiator 6 does not rise. You may do so. Further, only the EV radiator 6 may be opposed to the outdoor heat exchanger 4 without using the integrated radiator 7.
[0034]
In the present embodiment, the air conditioning control means only performs the third compressor control means, the air conditioning control means sequentially performs the inside and outside air switching control means and the second compressor control means, the inside and outside air switching control means, the first compressor control means and the Although the air conditioning control means for sequentially performing the two compressor control means and the third compressor control means has been described, other than the above, the inside / outside air switching control means, the first compressor control means, the second compressor control means, and the third compressor control means Alternatively, an air-conditioning control unit combining one or two or more units may be used.
[0035]
In the present embodiment, the inside / outside air switching control means, the first compressor control means, the second compressor control means, and the third compressor control means perform the respective means, and after a lapse of one minute, the detection value of the water temperature sensor 94 is set. When the value becomes equal to or less than the value, the control is switched to the normal control. However, a hysteresis method may be used in which the switch to the normal control is not performed unless the value is lower than the previous set value. . When the hysteresis method is used, it is not necessary to wait one minute after performing each means.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating an overall configuration of a vehicle air conditioner according to a first embodiment.
FIG. 2 is a flowchart illustrating a control method according to the first embodiment.
FIG. 3 is a flowchart illustrating a control method according to a second embodiment.
FIG. 4 is a flowchart illustrating a control method according to a third embodiment.
FIG. 5 is a schematic diagram illustrating division of a temperature region in a control method according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hybrid vehicle 2 Vehicle air conditioner 3 Refrigeration cycle 31 Compressor 33 Evaporator 4 Outdoor heat exchanger 5 Air conditioning unit 51 Duct 52 Inside / outside air switching door 6 EV radiator 7 Integrated radiator 8 Engine cooling water circuit 9 EV cooling water circuit 91 Electric parts 94 Water temperature sensor (cooling water temperature detecting means)

Claims (7)

A refrigeration cycle mounted on a vehicle having a traveling motor and having an outdoor heat exchanger for air-cooling a refrigerant,
A radiator that is disposed in series downstream of the outdoor heat exchanger in the flow direction of the air-cooled air, and air-cools cooling water that cools electrical components mounted on the vehicle.
Cooling water temperature detecting means for detecting the temperature of the cooling water flowing out of the radiator,
An air conditioner for a vehicle, comprising: air conditioning control means for decreasing the refrigerating capacity of the refrigerating cycle when the temperature of the cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value. The vehicle air conditioner according to claim 1, further comprising: an evaporator disposed in a duct that guides air into a vehicle cabin and configured to cool the air with a refrigerant,
The air conditioner for a vehicle according to claim 1, wherein the air conditioning control means reduces the amount of heat absorbed by the refrigerant in the evaporator when the temperature of the cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value. The vehicle air conditioner according to claim 2, further comprising: an inside / outside air switching door that switches air guided into the duct to an outside air introduction mode for introducing air from outside the vehicle compartment or an inside air circulation mode for circulating air from the vehicle interior.
The air conditioning control unit is an inside / outside air switching control unit that switches the inside / outside air switching door to an inside air circulation mode when the temperature of the cooling water detected by the cooling water temperature detection unit is equal to or higher than a set value. Vehicle air conditioner. 2. The vehicle air conditioner according to claim 1, wherein the air conditioning control unit releases the refrigerant from the refrigerant in the outdoor heat exchanger when a temperature of the cooling water detected by the cooling water temperature detecting unit is equal to or higher than a set value. 3. An air conditioner for a vehicle, which reduces the amount of heat. The vehicle air conditioner according to claim 4, further comprising a compressor that compresses refrigerant and discharges the refrigerant to the outdoor heat exchanger.
The vehicle air conditioner, wherein the air conditioning control means is a compressor control means for limiting a discharge amount of the compressor when a temperature of the cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value. . The air conditioner for a vehicle according to claim 5, wherein the compressor control unit includes:
When the temperature of the cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value,
One or more of first compressor control means for inhibiting the rotation speed of the compressor from increasing, second compressor control means for decreasing the rotation speed of the compressor by a predetermined amount, and third compressor control means for stopping the compressor. An air conditioner for a vehicle, which is a combination. 2. The air conditioner for a vehicle according to claim 1, wherein the evaporator is disposed in a duct that guides the air into the vehicle compartment and cools the air with a refrigerant, and the outside air introduces the air guided into the duct from outside the vehicle compartment. An internal / external air switching door that switches to a mode or an internal air circulation mode for circulating from the vehicle interior, and a compressor that compresses refrigerant and discharges the refrigerant to the outdoor heat exchanger,
The air conditioning control means, when the temperature of the cooling water detected by the cooling water temperature detecting means is equal to or higher than a set value,
Inside / outside air switching control means for switching the inside / outside air switching door to the inside air circulation mode, first compressor control means for inhibiting an increase in the rotation speed of the compressor, second compressor control means for lowering the rotation speed of the compressor by a predetermined amount, and An air conditioner for a vehicle, comprising a combination of any two or more of the third compressor control means for stopping the compressor.

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