JPH06206438A - Heat pump type air-conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To provide an air-conditioning device which can control the dehumidifying heating easily with a low electric power. CONSTITUTION:In a heat pump type air-conditioning device for vehicle to carry out at least the heating by the heat pump, the first indoor heat exchanger 21 to operate as a coolant evapolator to evaporate a coolant in a heating operation, a coolant throttle device, and the second indoor heat exchanger 2 to operate as a coolant condenser to condense the coolant, are provided, and the temperature of the first indoor heat exchanger 21 is made regulatable by the throttling amount of the throttle device, while the temperature of the second indoor heat exchanger 2 is made regulatable by the rotation frequency of a compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for heating a vehicle with a heat pump.

[0002]

2. Description of the Related Art In a conventional fuel-driven automobile air conditioner, for example, as shown in the concrete structure of FIG. After the heat is radiated to the air outside the vehicle compartment to condense and liquefy the refrigerant by the air conditioner 2 and the outdoor heat exchanger blower 3, the refrigerant is guided to the indoor heat exchanger 5 via the refrigerant expansion device 4, and the indoor blower 6 The air blown by is evaporated while cooling and the cooling action is performed.

The heating action is to stop the compressor 1 and let the engine cooling water (warm water) flow through the heater core 15 to heat the air blown by the indoor blower 6.

The temperature of the air blown from the vehicle interior air outlets 10, 11, 12 is adjusted by adjusting the opening of the mix damper 16 arranged in the ventilation duct 20.
This is performed by adjusting the amounts of warm air flowing through the heater core 15 and cold air bypassing the heater core 15. Further, the compressor 1 is driven by the engine, and the air cooled by the indoor heat exchanger 5 is reheated by the heater core 15, so that dehumidifying and heating can be performed. Further, by using the mix damper 16, it is possible to continuously change the blowout temperature from cooling to heating and vice versa.

On the other hand, a heat pump type air conditioner for driving a compressor by an electric motor, for example, an air conditioner for an electrically driven automobile is shown in FIG.
Shown in. The cooling action is similar to the above, but since there is no cooling water (warm water) for the engine in the heating device, the four-way switching valve 7 is used downstream of the compressor 1 to reverse the refrigerant flow path, and the indoor heat exchanger is used. After heating the air blown by the indoor air blower 6 to condense and liquefy the refrigerant, the refrigerant is guided to the outdoor heat exchanger 2 via the refrigerant expansion device 4, where the air outside the vehicle is cooled. At the same time, heat pump heating is performed in which the refrigerant absorbs heat and evaporates. Therefore, since there is no mix damper like the air conditioner for a fuel-driven automobile, the blow-out temperature is adjusted by controlling the electric motor driving device 9 that drives the electric motor 8 to adjust the rotation speed of the compressor 1. Become. In addition, switching between heating and cooling is performed by the four-way switching valve 7
Is performed by switching the refrigerant flow path.

However, dehumidifying and heating cannot be performed with the heat pump type air conditioner. Therefore, as shown in FIG. 5, the indoor heat exchanger 5 may be used for cooling, the electric heater 25 may be provided for heating, and the mix damper 16 may be provided to address the above problem.

[0007]

In heating in air conditioning of a vehicle, moisture in the vehicle compartment often causes high humidity in the vehicle compartment due to moisture from the human body. When the humidity inside the vehicle becomes high, the glass becomes cloudy and the visibility is obstructed, which is a problem in driving. In addition, the comfort of the heating is impaired due to the feeling of sultry heat.

Therefore, it is necessary to perform dehumidification heating by configuring as shown in FIG. However, in this case, since the electric heater is used, the power consumption becomes extremely large. Therefore, in the case of an electrically driven vehicle, if the power consumption of the air conditioner becomes large, the power consumption of the vehicle drive motor will be suppressed, which will affect the running performance.

Therefore, it is an object of the present invention to provide a heat pump type air conditioner for a vehicle capable of dehumidifying and heating without requiring much electric power.

[0010]

In order to solve the above-mentioned problems as a first means, the present invention relates to a vehicle heat pump type air conditioner for heating at least with a heat pump, wherein a refrigerant evaporation for evaporating a refrigerant during heating operation. A first indoor heat exchanger that functions as a heat exchanger, a refrigerant expansion device, and a second indoor heat exchanger that functions as a refrigerant condenser that condenses the refrigerant, and the temperature of the first indoor heat exchanger is adjusted by the refrigerant expansion device. At
The temperature of the second indoor heat exchanger can be adjusted by the rotation frequency of the compressor.

In order to solve the above-mentioned problems, the present invention is, in the first means, required for air conditioning in the vehicle compartment based on at least the environmental condition outside the vehicle compartment, the environmental condition inside the vehicle compartment, and the operation information of the occupant. It is provided with a means for calculating various heating capacity and dehumidifying capacity, determining the refrigerant throttle amount and the rotation frequency of the compressor, and outputting them to each drive device.

According to the present invention, in order to solve the above-mentioned problems as the third means, the humidity condition is included as the vehicle interior environmental condition in the second means.

[0013]

According to the first means of the present invention, the temperature of the first indoor heat exchanger for cooling the air is adjusted by the refrigerant expansion device,
By adjusting the temperature of the second indoor heat exchanger that heats the air by the rotation frequency of the compressor, it is possible to prevent the operation of the protective function and easily adjust the blowout temperature.

According to the second means of the present invention, the heating capacity and the dehumidifying capacity necessary for the air conditioning in the vehicle compartment are calculated based on the vehicle exterior environment condition, the vehicle interior environment condition, and the operation information of the passenger, and the refrigerant throttle is calculated. Since a means for determining the amount and the rotation frequency of the compressor and outputting it to each drive device is provided, the air conditioning is automatically performed, and a comfortable environment is created without any manual labor.

According to the third means of the present invention, since the humidity condition is included as the vehicle interior environment condition, the necessary dehumidifying capacity can be accurately calculated.

[0016]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a vehicle heat pump type air conditioner according to a first embodiment of the present invention. 5 is different from that of the conventional heat pump type air conditioner for a vehicle provided with an electric heater in the embodiment of the present invention in FIG.
Compared with the conventional example, the mix damper 16, the electric heater 25, and the electric heater adjusting device 26 are deleted, an indoor heat exchanger and a refrigerant expansion device are added, and the connection is partially changed.

When operating in cooling, the four-way switching valve 7 is set as shown by the solid line in FIG. 1, the refrigerant discharged from the compressor 1 is guided to the outdoor heat exchanger 2, and is blown by the outdoor heat exchanger blower 3. To condense. Here, the first indoor heat exchanger 21 stops its function by fully squeezing the first refrigerant expansion device 23.

Next, the refrigerant is carried to the second indoor heat exchanger 22 through the refrigerant expansion device 24, and cools and evaporates the air blown by the indoor air blower 6.

On the other hand, when operating by heating, the four-way switching valve 7 is set as shown by the broken line in FIG. The discharged refrigerant is guided to the second indoor heat exchanger 22 by the compressor 1. Next, the air blown by the indoor blower 6 is heated to condense and liquefy the refrigerant, which is then conveyed to the outdoor heat exchanger 2 via the refrigerant expansion device 24 and blown by the outdoor heat exchanger blower 3. Cool the air and evaporate. Here, similarly to the above, the first indoor heat exchanger 21 stops its function by fully squeezing the first refrigerant expansion device 23.

When the dehumidifying heating is used, the first indoor heat exchanger 21 is also operated as compared with the heating operation. The operation is as follows.

The four-way switching valve 7 is set as shown by the broken line in FIG. The discharged refrigerant is used as a second indoor heat exchanger 22 by the compressor 1.
To heat the air blown by the indoor blower 6 to condense and liquefy the refrigerant. Next, the refrigerant is carried to the outdoor heat exchanger 2 via the refrigerant expansion device 24 and cools the air blown by the outdoor heat exchanger air blower 3 to evaporate. On the other hand, the refrigerant is also carried to the first indoor heat exchanger 21 via the refrigerant expansion device 23 and cools the air blown by the indoor blower 6 to evaporate.

At this time, the temperature of the first indoor heat exchanger 21 can be adjusted by the amount of expansion of the refrigerant expansion device 23, and the temperature of the second indoor heat exchanger 22 changes the rotational speed of the compressor 1 by a motor. It can be adjusted by the device 9.

FIG. 2 is a block diagram of a vehicle heat pump type air conditioner according to a second embodiment of the present invention. Here, the difference from the configuration diagram of the vehicle heat pump type air conditioner according to the first embodiment shown in FIG. 1 is that the embodiment of the present invention is different from the first embodiment shown in FIG. The point is that a section 28, a vehicle exterior environmental condition detection device 29, and a vehicle interior environmental condition detection device 30 are added.

The occupant's operation information is input from the operation unit 28, the vehicle outside environment condition is detected by the vehicle outside environment condition detecting device 29, and the vehicle interior environment condition is detected by the vehicle interior environment condition detecting device 30.
Is input to. Based on the above information, the control device 27 first determines whether cooling or heating based on the vehicle exterior temperature, the vehicle interior temperature, the amount of solar radiation, and the set temperature, and outputs it to the four-way switching valve 7. In the case of heating, the heating capacity required for air conditioning in the passenger compartment is determined by the temperature outside the passenger compartment,
Calculation is performed based on the vehicle interior temperature, the amount of solar radiation, and the set temperature to determine the rotation frequency of the compressor, which is output to the motor drive device 9. On the other hand, whether or not dehumidification is necessary is determined based on the vehicle exterior temperature. When dehumidification becomes necessary, the necessary dehumidification capacity is estimated and calculated by the temperature outside the vehicle compartment to determine the refrigerant throttling amount to determine the first refrigerant throttling device 23.
Output to. Also, if necessary, the second refrigerant expansion device 24
Also output to.

Here, when humidity is also detected as the vehicle interior environment condition, the necessary dehumidifying ability can be directly calculated, and the accuracy can be improved as compared with the case of determining only the vehicle exterior temperature.

As the control procedure, first, the required heating capacity is determined to adjust the electric motor drive device 9, and then the required dehumidification capacity is determined to adjust the throttle amount of the refrigerant expansion device 23. It's easy to do.

Various arrangements, numbers and configurations of heat exchangers can be applied within the scope of the present invention.

[0029]

According to the first means of the present invention, in addition to the first indoor heat exchanger for cooling the air, the second for heating the air is provided.
Since the indoor heat exchanger is provided and the heating is performed by the heat pump instead of the electric heater, the electric power for heating can be reduced.
However, if the mixed damper is used to adjust the blowout temperature, when the mixed damper is closed, the blow to the second indoor heat exchanger that functions as a refrigerant condenser that condenses the refrigerant is interrupted, and the high pressure of the refrigerant circuit suddenly increases. As a result, the protection function operates and the compressor stops, which makes it difficult to actually control the blowout temperature. Therefore, in the means of the present invention,
The temperature of the first indoor heat exchanger that cools the air is adjusted by the refrigerant expansion device, and the temperature of the second indoor heat exchanger that heats the air is adjusted by the rotation frequency of the compressor. It is possible to prevent the operation and easily adjust the blowout temperature.

According to the second means of the present invention, the heating capacity and the dehumidifying capacity necessary for the air conditioning in the vehicle compartment are calculated based on the vehicle exterior environment condition, the vehicle interior environment condition, and the operation information of the passenger, and the refrigerant throttle is operated. Since a means for determining the amount and the rotation frequency of the compressor and outputting it to each drive device is provided, the air conditioning is automatically performed, and a comfortable environment is created without any manual labor.

According to the third means of the present invention, since the humidity condition is included as the vehicle interior environment condition, the necessary dehumidifying capacity can be accurately calculated.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vehicle heat pump type air conditioner according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a vehicle heat pump type air conditioner according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional air conditioner for a vehicle driven by a fuel engine.

FIG. 4 is a configuration diagram of a conventional vehicle heat pump type air conditioner.

FIG. 5 is a configuration diagram of a vehicle heat pump type air conditioner provided with a conventional electric heater.

[Explanation of symbols]

 2 Outdoor heat exchanger 4 Refrigerant expansion device 5 Indoor heat exchanger 27 Control device 28 Operation part 29 Vehicle exterior environmental condition detection device 30 Vehicle interior environmental condition detection device

Claims (3)

[Claims] 1. A heat pump type air conditioner for a vehicle in which at least heating is performed by a heat pump, a first indoor heat exchanger that functions as a refrigerant evaporator that evaporates a refrigerant during a heating operation, a refrigerant expansion device, and a refrigerant condensate. A second indoor heat exchanger that functions as a refrigerant condenser, wherein the temperature of the first indoor heat exchanger can be adjusted by the throttle amount of the refrigerant expansion device, and the temperature of the second indoor heat exchanger is a compressor. A heat pump type air conditioner for vehicles, which can be adjusted by the rotation frequency of. 2. A heating capacity and a dehumidification capacity required for air conditioning in the vehicle compartment are calculated based on at least the vehicle exterior environment condition, the vehicle interior environment condition, and occupant operation information to determine the refrigerant throttle amount and the compressor rotation frequency. The heat pump type air conditioner for a vehicle according to claim 1, further comprising means for determining and outputting to each drive device. 3. A heat pump type air conditioner for a vehicle according to claim 2, wherein humidity conditions are included as environmental conditions of the vehicle interior.