JP2004237907A - Air-conditioning system for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioning system for an automobile capable of favorably maintaining an in-cabin environment at an idling stopping time, and reducing a load on an engine when starting or traveling on an uphill road. <P>SOLUTION: The automobile 1 equipped with a vehicle-mounted battery 5 is provided with an engine-driven compressor 18 driven by the engine 2, and an electric compressor 10 driven by power supply from the vehicle-mounted battery 5. A refrigerant circuit of the air-conditioning system for the automobile is constituted by connecting the engine-driven compressor 18 and the electric compressor 10 in parallel. An air-conditioning controller 21 controlling the operation of the electric compressor 10 is provided and operates the electric compressor 10 at the idling stopping time of the automobile 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an air conditioning system for air-conditioning the interior of an automobile.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a car air conditioner (vehicle air conditioning system) used for a general automobile, a compressor is driven by an engine (internal combustion engine) (engine driven compressor). The high-temperature gas refrigerant discharged from the compressor and flowing into the exterior heat exchanger is heat-exchanged with air outside the vehicle by an exterior blower to radiate heat, condensed and liquefied, and then condensed and liquefied. Flows into the vehicle interior heat exchanger provided in the vehicle. The liquid refrigerant evaporates there and exerts a cooling function by absorbing heat from the surroundings. The vehicle interior heat exchanger exchanges heat with the air in the vehicle interior circulated by the vehicle interior blower, cools the vehicle interior, and performs air conditioning. And the refrigerant | coolant which came out of the vehicle interior heat exchanger repeated the cycle which returns to a compressor.
[0003]
The control device provided in such a car air conditioner turns off the rotation of the compressor when the interior of the vehicle is cooled to a lower limit temperature between a predetermined upper limit temperature and a lower limit temperature. Then, the temperature in the vehicle compartment increases, and when the temperature reaches the upper limit temperature, the control device turns on the compressor and restarts the cooling in the vehicle compartment. In this way, the interior of the vehicle is cooled, and on the other hand, the heating operation is applied by the warm air from the heater, thereby maintaining the interior of the vehicle at the set temperature throughout the four seasons and performing air conditioning to make the vehicle comfortable. 1).
[0004]
[Patent Document 1]
JP 2002-340495 A
[0005]
[Problems to be solved by the invention]
However, in recent years, due to the problem of global environmental pollution due to exhaust gas from an engine-driven vehicle, when the vehicle stops running such as at a traffic light or when the vehicle stops running in traffic jams, the engine is stopped (idling stop) and the exhaust gas is stopped. The development of automobiles that do not emit CO2 is progressing. When the idling stop is performed in an automobile in which the idling stop is performed, particularly in summer when the temperature in the cabin becomes high, the engine-driven compressor stops and the temperature in the cabin rises, and a sufficient There is a problem that air conditioning cannot be performed. Also, when the vehicle starts or when traveling on a hill, the engine-driven compressor becomes a load. Therefore, when the car air conditioner is operating, the load on the engine increases and the traveling performance deteriorates, or There was also a problem that the comfort was deteriorated when the machine was turned off.
[0006]
Here, in recent years, in order to solve the environmental destruction problem (the ozone depletion problem) caused by the HFC-based refrigerant, carbon dioxide (CO 2), which is a natural refrigerant, is used as the refrigerant. ₂ ) Is considered to be used, but at high outside temperatures, the cooling capacity is lower than that of a normal HFC-based refrigerant. Therefore, the CO ₂ When a refrigerant is used, a high-output compressor is required, and under a general load condition, a lossy operation is forced.
[0007]
The present invention has been made in order to solve the conventional technical problem, for example, the vehicle interior environment can be suitably maintained at the time of idling stop of the car, and at the time of starting, or at the time of running on a hill. An automotive air conditioning system capable of reducing the load on an engine is provided. ₂ An object of the present invention is to improve the efficiency by selecting an engine-driven compressor suitable for general load conditions by dividing the output of the compressor when a refrigerant is used.
[0008]
[Means for Solving the Problems]
That is, the automotive air conditioning system of the present invention is used in an automobile having a power storage means, and connects an engine driven compressor driven by an engine and an electric compressor driven by power supply from the power storage means in parallel. And a control means for controlling the operation of the electric compressor, and the interior of the passenger compartment is air-conditioned by the evaporator of the refrigerant circuit.
[0009]
A vehicle air conditioning system according to a second aspect of the present invention is characterized in that, in addition to the above-described invention, the control means operates the electric compressor at an idling stop of the vehicle.
[0010]
According to a third aspect of the present invention, in addition to the above inventions, the control means operates the electric compressor during low-speed operation and / or acceleration operation of the vehicle.
[0011]
A vehicle air conditioning system according to a fourth aspect of the present invention is characterized in that, in addition to the above inventions, the control means operates the electric compressor when the capacity of the engine driven compressor is insufficient.
[0012]
According to a fifth aspect of the present invention, in addition to the above inventions, the control unit operates the electric compressor during the dehumidifying operation in the vehicle compartment.
[0013]
The vehicle air conditioning system according to claim 6 is characterized in that, in addition to the above-described inventions, carbon dioxide is used as a refrigerant in the refrigerant circuit.
[0014]
ADVANTAGE OF THE INVENTION According to the automotive air conditioning system of this invention, in the motor vehicle provided with the electric storage means, the engine drive compressor driven by the engine and the electric compressor driven by the electric power supply from the electric storage means are connected in parallel. And a control means for controlling the operation of the electric compressor, and the interior of the vehicle is air-conditioned by the evaporator of the refrigerant circuit. If the electric compressor is operated during the idling stop, the refrigerant can be circulated in the refrigerant circuit by the electric compressor even during the idling stop, and the air conditioning in the vehicle compartment can be performed. As a result, it is possible to prevent inconvenience that the temperature in the vehicle compartment increases during idling stop, and it is possible to prevent the environment inside the vehicle compartment from decreasing when idling is stopped during riding. Things.
[0015]
Further, as in claims 3 and 4, the electric compressor is operated during low-speed operation and / or acceleration operation of the vehicle, or the electric compressor is operated when the capacity of the engine-driven compressor is insufficient. By doing so, it is possible to ensure the required air-conditioning capacity while using, for example, a low-capacity engine-driven compressor. As a result, it is possible to greatly improve the fuel efficiency of the automobile and contribute to the improvement of environmental pollution problems.
[0016]
In addition, by operating the electric compressor during the dehumidifying operation as in claim 5, an engine-driven compressor having a small required capacity and a large output is not required, for example, in the case of dehumidifying when defrosting a vehicle window in rainy weather. In addition, when fine control is required, it is possible to perform an operation that balances the load with the electric compressor.
[0017]
In particular, if carbon dioxide is used as the refrigerant in the refrigerant circuit as in the vehicle air conditioning system according to the sixth aspect of the present invention, it is suitable for global environmental problems. In this case, there is a concern that the capacity is insufficient at high temperature, but the two compressors complement each other, so that the problem of the insufficient capacity of the compressor is solved and the air conditioning efficiency can be improved.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a schematic diagram (side view) of an automobile 1 according to an embodiment to which the present invention is applied, FIG. 2 is a schematic diagram (plan view) of the automobile 1, and FIG. 3 is a refrigerant circuit diagram of an air conditioner 9 of the automobile 1. Is shown.
[0019]
Here, there are the following types of automobiles. A normal engine-driven vehicle that runs on an engine (internal combustion engine), a series hybrid vehicle that runs on a vehicle battery by charging the power generated by the engine and drives the running motor with the power supplied from the battery, A hybrid vehicle (HEV) having both functions, a hybrid vehicle (HEV) having both of these functions, charging the power generated by the fuel cell to the vehicle battery, and using the power supplied from the vehicle battery for traveling For example, a fuel cell vehicle (FCEV) that runs by driving a motor. The present invention is applicable to at least the above-described engine-driven vehicle or hybrid vehicle. In the following embodiments, a hybrid vehicle will be described as an example.
[0020]
In the figure, reference numeral 1 denotes a hybrid vehicle (hereinafter, referred to as a vehicle). The vehicle 1 is equipped with an engine 2 and an air conditioner 9 constituting the vehicle air conditioning system of the present invention. The air conditioner 9 performs air conditioning such as cooling, heating, and dehumidification in the passenger compartment 22 of the vehicle 1. The vehicle 1 includes an engine-driven compressor 18 driven by a vehicle engine, and a compressor (not shown). An electric compressor 10 driven by a motor (electric motor) and an air-conditioning control device 21 (corresponding to control means of the present invention) are provided.
[0021]
Further, the electric compressor 10 is configured by a hermetic compressor such as a rotary compressor, and a pipe 10A on the discharge side of the electric compressor 10 is connected via a check valve 11 to serve as an outdoor heat exchanger. It is connected to a gas cooler (external heat exchanger) 13. A pipe 13A on the outlet side of the gas cooler 13 is connected via an intermediate heat exchanger 14 to an expansion valve 15 as a pressure reducing device, and the expansion valve 15 is connected to an evaporator (cooler) 16 as a vehicle interior heat exchanger. ing. The check valve 11 allows the gas refrigerant discharged from the electric compressor 10 to flow out to the gas cooler 13, but prevents the gas refrigerant from flowing into the electric compressor 10 from the gas cooler 13 (FIG. 3).
[0022]
A pipe 16 </ b> A on the outlet side of the evaporator 16 is connected to an accumulator (gas-liquid separator) 17. The pipe 17A on the outlet side of the accumulator 17 forms an annular refrigerant circuit connected to the pipe 10B on the suction side of the electric compressor 10 via the intermediate heat exchanger 14. That is, the accumulator 17 is connected to the suction side of the electric compressor 10 via the intermediate heat exchanger 14 by piping.
[0023]
The intermediate heat exchanger 14 exchanges heat between the high-temperature high-pressure refrigerant discharged from the gas cooler 13 and the low-temperature low-pressure refrigerant discharged from the accumulator 17. The intermediate heat exchanger 14 further cools the refrigerant radiated by the gas cooler 13 and further gasifies the refrigerant passing through the accumulator 17, thereby improving the cooling capacity.
[0024]
The suction-side pipe 10B of the electric compressor 10 is branched from the intermediate heat exchanger 14 and connected to the suction-side pipe 18B of the open-type engine-driven compressor 18. Is connected to the gas cooler 13 via a check valve 19. That is, the engine-driven compressor 18 and the electric compressor 10 are connected in parallel between the gas cooler 13 and the intermediate heat exchanger 14. The check valve 19 allows the refrigerant discharged from the engine-driven compressor 18 to flow out to the gas cooler 13, but prevents the gas refrigerant from flowing into the engine-driven compressor 18 from the gas cooler 13. The engine-driven compressor 18 is driven by the engine 2 via the V-belt 6.
[0025]
The electric compressor 10, the engine-driven compressor 18, and the gas cooler 13 are installed outside the vehicle compartment such as the engine room of the automobile 1, and the evaporator 16 is installed inside the vehicle compartment 22. The electric compressor 10 is provided with the compressor motor, and the electric compressor 10 is driven by the compressor motor. The gas cooler 13 is provided with an outdoor blower 12 (which may be a radiator fan) for radiating the heat of the gas cooler 13 to the outside of the vehicle, and the evaporator 16 is provided with an indoor blower 20, and the air cooled by the evaporator 16 is provided. Is blown into the passenger compartment 22 by the indoor blower 20, whereby the passenger compartment 22 is cooled.
[0026]
On the other hand, the automobile 1 is provided with a traveling motor 3, a generator 4 and a vehicle-mounted battery (corresponding to power storage means of the present invention) 5 in addition to the engine 2. It is connected to the vehicle-mounted battery 5 via 3A. The electric compressor 10 is connected to the vehicle battery 5 via the air conditioning inverter 8. The traveling motor 3 and the electric compressor 10 are driven by power supply from the vehicle-mounted battery 5. The main shaft inverter 3A is controlled by a traveling control device (ECU) (not shown), and the air conditioning inverter 8 is controlled by the air conditioning control device 21. The traveling control device and the air conditioning control device 21 exchange data with each other.
[0027]
A torque dividing mechanism (not shown) is connected to the engine 2, the traveling motor 3, and the generator 4. The torque dividing mechanism includes the traveling motor 3 and the generator 4, and the engine 2 and the traveling motor 3. The vehicle 1 is driven by adjusting the rotation of the vehicle 1 to one. That is, the vehicle 1 is driven by rotating the wheels 7 with the driving force of the engine 2 and the driving motor 3. The technique of driving the automobile 1 by combining the rotation of the traveling motor 3 and the generator 4 and the rotation of the engine 2 and the traveling motor 3 with one by the torque dividing mechanism is a well-known technique and will be described in detail. Is omitted.
[0028]
Here, the torque dividing mechanism uses the traveling motor 3 at the time of starting or at a low speed when the driving torque load of the engine 2 is large, and also when the driving force is required more than the driving force of the engine 2 alone. The running motor 3 is used as a source. Then, as the engine 2 shifts to high speed with good thermal efficiency, the torque dividing mechanism shifts to engine 2 initiative. Further, when the engine 2 is driven, the power generated by the generator 4 is charged to the vehicle-mounted battery 5 according to the state of charge of the vehicle-mounted battery 5. Further, the generator 4 is used as a starter when the engine 2 is started, in addition to the power generation function during the rotation of the engine 2.
[0029]
The air-conditioning inverter 8 of the electric compressor 10, the clutch of the engine-driven compressor 18, the outdoor blower 12, the indoor blower 20, and the on-vehicle battery 5 are constituted by a general-purpose microcomputer. (FIG. 1). The air-conditioning control device 21 is provided with a step-up / step-down circuit (not shown). The air-conditioning control device 21 raises or lowers the voltage of the vehicle-mounted battery 5 to a desired voltage by the step-up / step-down circuit. The electric compressor 10 is converted into a drive voltage of a compressor motor, and the electric compressor 10 is rotationally driven, and the electric compressor 10 is operated when the idling of the automobile 1 is stopped (when the engine-driven compressor 18 is stopped).
[0030]
In addition, the air-conditioning control device 21 releases the clutch of the engine-driven compressor 18 at the time of low-speed operation or acceleration operation of the automobile 1 and disconnects (stops) the engine 2 to operate the electric compressor 10 and When the capacity of the engine-driven compressor 18 is insufficient, the electric compressor 10 can be additionally operated. Further, although not shown, the air-conditioning control device 21 rotates AUTO in proportion to the rotation speed of the electric compressor 10, and changes the rotation speed of the indoor blower 20 in a plurality of steps at a fixed rate, and blows the air into the vehicle interior 22. A blower fan switch for manually determining the air volume is connected.
[0031]
The engine-driven compressor 18 has a small capacity and a small capacity. Therefore, the operating capacity is insufficient in summer or the like when the temperature in the vehicle interior 22 becomes extremely high. However, when the temperature in the vehicle interior 22 becomes high and the operating performance of the engine drive compressor 18 becomes insufficient, The control device 21 is configured to operate both the engine-driven compressor 18 and the electric compressor 10 to supplement the operation capability of the engine-driven compressor 18. The excluded volume of the electric compressor 10 is set to 70% or less of the excluded volume of the engine-driven compressor 18. Thus, the vehicle-mounted battery 5 can be prevented from being rapidly discharged at the time of idling stop as much as possible, and the air-conditioning in the vehicle interior 22 can be suitably performed by maintaining the temperature in the vehicle interior 22 substantially.
[0032]
Next, the operation of the automotive air-conditioning system of the present invention having the above configuration will be described. The refrigerant in the refrigerant circuit is a natural refrigerant in consideration of flammability and toxicity, which is friendly to the global environment. ₂ (Carbon dioxide) shall be used. CO ₂ Since the operating pressure is high and the flow resistance is small, the pressure tends to be equal to the equilibrium pressure and does not hinder the startability of the electric compressor 10. Further, if the two-stage compression type electric compressor 10 is employed, since the electric compressor 10 has two or more check valves, differential pressure activation becomes possible. When the automotive air-conditioning system is operated, the air-conditioning control device 21 uses the information from the traveling control device or a sensor (not shown) to stop the idling of the automobile 1 or at the time of low-speed operation or acceleration operation of the automobile 1, or It is determined whether the capacity of the engine-driven compressor 18 is insufficient.
[0033]
When the output of the engine 2 is equal to or more than a predetermined output while the automobile 1 is running, the air conditioning control device 21 operates only the engine drive compressor 18 (in this case, the compressor motor of the electric compressor 10 is not driven). ). Thus, the refrigerant in the refrigerant circuit is compressed by the engine-driven compressor 18, and the discharged high-temperature and high-pressure gas refrigerant flows into the gas cooler 13 via the check valve 19. At this time, since the check valve 11 is provided in the pipe 10A on the outlet side of the electric compressor 10, the high-temperature and high-pressure gas refrigerant discharged from the engine drive compressor 18 is placed in the electric compressor 10 where it is not operated. No backflow.
[0034]
Further, an outdoor blower motor (not shown) that drives the outdoor blower 12 is operated by being supplied with power from the vehicle-mounted battery 5, so that the gas cooler 13 is cooled outside the vehicle compartment by the blowing of the outdoor blower 12. Then, the gas refrigerant flowing into the gas cooler 13 radiates heat there, is condensed and liquefied, is heat-exchanged in the intermediate heat exchanger 14, is further cooled, reaches the expansion valve 15, is throttled there, and then evaporates. Flow into 16.
[0035]
The refrigerant flowing into the evaporator 16 evaporates there, and at this time, absorbs heat from the surroundings to exhibit a cooling function. The cooled air in the passenger compartment 22 is circulated into the passenger compartment 22 by the indoor blower 20, whereby the passenger compartment 22 is cooled and air-conditioned. Then, the refrigerant having exited from the evaporator 16 enters the accumulator 17, where the unevaporated liquid refrigerant is separated into gas and liquid, and then flows again into the intermediate heat exchanger 14, where the heat is exchanged and heated, and the unevaporated liquid refrigerant is heated. Is gasified, only the gas refrigerant is sucked into the engine-driven compressor 18, and the refrigerant cycle is again compressed and discharged by the engine-driven compressor 18.
[0036]
On the other hand, when the vehicle 1 is running and the output of the engine 2 is equal to or less than a predetermined output, the air-conditioning control device 21 operates the electric compressor 10. That is, the operation of the engine-driven compressor 18 is stopped at the time of starting or at a low speed when the driving torque load of the engine 2 is large, and the compressor motor is operated by the air-conditioning inverter 8 by supplying power from the on-vehicle battery 5 to operate the electric compressor 10. drive. Thus, the refrigerant in the refrigerant circuit is compressed by the electric compressor 10, and the discharged high-temperature and high-pressure gas refrigerant flows into the gas cooler 13 via the check valve 11. At this time, since the check valve 19 is provided in the pipe 18A on the outlet side of the engine-driven compressor 18, the high-temperature and high-pressure gas refrigerant discharged from the electric compressor 10 flows back into the engine-driven compressor 180. There is no.
[0037]
Also at this time, the outdoor blower motor (not shown) that drives the outdoor blower 12 is supplied with power and is operated by the vehicle-mounted battery 5, so that the gas cooler 13 is cooled outside the vehicle compartment by the blowing of the outdoor blower 12. The gas refrigerant flowing into the gas cooler 13 radiates heat there, is condensed and liquefied, exchanges heat with the intermediate heat exchanger 14, is further cooled, reaches the expansion valve 15, is throttled there, and then evaporates. Flow into 16.
[0038]
The refrigerant flowing into the evaporator 16 evaporates there, and at this time, absorbs heat from the surroundings to exhibit a cooling function. The cooled air in the passenger compartment 22 is circulated into the passenger compartment 22 by the indoor blower 20, whereby the passenger compartment 22 is cooled and air-conditioned. The refrigerant exiting the evaporator 16 enters the accumulator 17, where the unevaporated liquid refrigerant is separated into gas and liquid, and then flows again into the intermediate heat exchanger 14, where it exchanges heat and is further warmed to the unevaporated liquid. The cooling cycle in which the refrigerant is gasified, only the gas refrigerant is sucked into the electric compressor 10, and is compressed and discharged again by the electric compressor 10 is repeated.
[0039]
Then, when the traveling of the automobile 1 is stopped, such as a stop at a traffic light or a stop in traffic congestion, and the traveling control device performs an idling stop, the air conditioning control device 21 Similarly, the compressor motor is operated to operate the electric compressor 10. This makes it possible to prevent the temperature inside the vehicle compartment 22 from rising during the idling stop. As described above, by performing air conditioning only by driving the electric compressor 10 by the vehicle-mounted battery 5 when the vehicle 1 is stopped at the idling time, it is possible to prevent environmental pollution due to exhaust gas from the fuel-engine vehicle and to prevent the air in the vehicle compartment 22 from being suitable. Air conditioning can be realized.
[0040]
When the load on the engine 2 increases when the vehicle 1 starts or runs on a slope, the air-conditioning control device 21 stops the operation of the engine-driven compressor 18 based on information from the running control device, The compressor motor is operated by power supply from the vehicle-mounted battery 5 to operate the electric compressor 10. Thus, the load on the engine 2 can be reduced when the vehicle 1 starts or runs on a hill, so that the vehicle 1 can start smoothly and the hill can be run comfortably. You will be able to run. Therefore, even when the operation of the engine-driven compressor 18 is stopped at the time of starting the vehicle 1 or at the time of running on a hill, it is possible to realize suitable air conditioning in the vehicle interior 22.
[0041]
On the other hand, when the temperature in the passenger compartment 22 becomes high in summer or the like and the operating capacity of the engine-driven compressor 18 becomes insufficient, the air-conditioning control device 21 detects that the operating capacity of the engine-driven compressor 18 is insufficient by the sensor. Is detected (for example, a rise in the temperature in the vehicle interior 22), and both the engine-driven compressor 18 and the electric compressor 10 are operated. That is, when the capacity of the engine-driven compressor 18 is insufficient, the air-conditioning control device 21 operates the electric compressor 10. As a result, the refrigerant is diverted and sucked into both the engine-driven compressor 18 and the electric compressor 10, is compressed by both, is discharged and merges, and flows into the gas cooler 13. This makes it possible to compensate for the shortage of the capacity of the engine-driven compressor 18, so that the air conditioning in the vehicle interior 22 can be efficiently performed. In addition, since the operating capacity of the engine-driven compressor 18 is reduced, the load on the engine 2 is also reduced during normal operation in which only the engine-driven compressor 18 is operated, so that the fuel consumption rate can be significantly improved. .
[0042]
That is, the capacity of the engine-driven compressor 18 can be maximized by the engine 2, and the air conditioning in the vehicle compartment can be efficiently performed. In particular, when the outside air temperature is extremely high and a large air-conditioning capacity is required, the interior of the passenger compartment 22 can be air-conditioned by both the engine-driven compressor 18 and the electric compressor 10, so that comfortable air-conditioning in the passenger compartment 22 is achieved. It can be realized.
[0043]
In addition, in addition to the above embodiment, only the electric compressor 10 is operated while the engine-driven compressor 18 is stopped during the defrosting operation for defrosting the vehicle interior in order to eliminate the fogging of the vehicle window during rainy weather. You may. Since the load is small during the dehumidifying operation, the engine-driven compressor 18 having a large output is not required, and the motor-driven compressor 10 can perform a fine and well-balanced load operation.
[0044]
In the embodiment, the vehicle 1 is described as a hybrid vehicle. However, the present invention is also effective when the air conditioning system for a vehicle is not limited to the hybrid vehicle but is applied to a vehicle running only with a normal engine (internal combustion engine). Also in this case, air conditioning is normally performed by the engine-driven compressor 18, and the electric compressor 10 is driven by the vehicle-mounted battery mounted at the time of idling stop, starting, or running on a slope, and the passenger compartment 22 is operated. By performing air conditioning inside, the same effect as described above can be obtained.
[0045]
【The invention's effect】
As described in detail above, according to the present invention, in an automobile equipped with a power storage means, an engine-driven compressor driven by an engine and an electric compressor driven by power supply from the power storage means are connected in parallel. And a control means for controlling the operation of the electric compressor, and the interior of the vehicle is air-conditioned by the evaporator of the refrigerant circuit. If the electric compressor is operated during the idling stop, the refrigerant can be circulated in the refrigerant circuit by the electric compressor even during the idling stop, and the air conditioning in the vehicle compartment can be performed. As a result, it is possible to prevent inconvenience that the temperature in the vehicle compartment increases during idling stop, and it is possible to prevent the environment inside the vehicle compartment from decreasing when idling is stopped during riding. Things.
[0046]
Further, as in claims 3 and 4, the electric compressor is operated during low-speed operation and / or acceleration operation of the vehicle, or the electric compressor is operated when the capacity of the engine-driven compressor is insufficient. By doing so, it is possible to ensure the required air-conditioning capacity while using, for example, a low-capacity engine-driven compressor. As a result, the fuel efficiency of the automobile can be greatly improved, and the problem of environmental pollution can be improved.
[0047]
In addition, by operating the electric compressor during the dehumidifying operation as in claim 5, an engine-driven compressor having a small required capacity and a large output is not required, for example, in the case of dehumidifying when defrosting a vehicle window in rainy weather. In addition, when fine control is required, it is possible to perform an operation that balances the load with the electric compressor.
[0048]
In particular, if carbon dioxide is used as the refrigerant in the refrigerant circuit as in the automotive air conditioning system according to the sixth aspect of the present invention, it is suitable for global environmental problems. In this case, there is a concern that the capacity is insufficient at high temperature, but the two compressors complement each other, so that the problem of the insufficient capacity of the compressor is solved and the air conditioning efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic view (side view) of an automobile provided with an automobile air conditioning system of the present invention.
FIG. 2 is a schematic view (plan view) of an automobile provided with the automobile air conditioning system of the present invention.
FIG. 3 is a refrigerant circuit diagram of the air conditioner of the automotive air conditioning system of the present invention.
[Explanation of symbols]
1 car
2 Engine
3 Traveling motor
4 Generator
5 In-vehicle battery
8 Air conditioning inverter
9 air conditioner
10 Electric compressor
11 Check valve
12 outdoor blower
13 Gas cooler
14 Intermediate heat exchanger
15 Expansion valve
16 Evaporator
17 Accumulator
18 Engine driven compressor
19 Check valve
20 indoor blower
21 Air conditioning controller
22 car room

Claims (6)

Used in vehicles equipped with power storage means,
A refrigerant circuit configured by connecting an engine-driven compressor driven by an engine and an electric compressor driven by power supply from the power storage means in parallel, and control means for controlling operation of the electric compressor And an air conditioning system for an automobile, wherein the interior of the vehicle is air-conditioned by an evaporator of the refrigerant circuit. 2. The vehicle air conditioning system according to claim 1, wherein the control unit operates the electric compressor at an idling stop of the vehicle. The vehicle air-conditioning system according to claim 1 or 2, wherein the control means operates the electric compressor during low-speed operation and / or acceleration operation of the vehicle. 4. The automotive air conditioning system according to claim 1, wherein the control unit operates the electric compressor when the capacity of the engine-driven compressor is insufficient. 5. The automotive air conditioning system according to claim 1, wherein the control unit operates the electric compressor during a dehumidifying operation in the vehicle interior. 6. The automotive air conditioning system according to claim 1, wherein carbon dioxide is used as a refrigerant in the refrigerant circuit.

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