JPH0596940A - Air-conditioning device for electrically driven automobile - Google Patents

Abstract

PURPOSE:To efficiently carry out air-conditioning for dehumidification by providing a first coolant constrictor disposed between two air heat-exchangers in a passenger compartment, air heat-exchangers outside of the passenger compartment, a blower for the air heat-exchangers outside of the passenger compartment, a first air-heat exchanger in the passenger compartment, a second coolant constrictor disposed between the air-heat exchangers outside of the passenger compartment, and a four-way selector valve. CONSTITUTION:Two constrictors 16, 17 and a four-way selector valve 13 which are controlled in accordance with a difference in temperature between a front windshield pane surface temperature detecting device 18 in a passenger compartment and an air due point temperature detecting device 19 in a passenger compartment and an operation mode are provided so that two air heat-exchanger in the air-heat-exchangers 14, 15 are used during heating mode operation, and during cooling mode operation. In the case of a condition such that the temperature of the outer surface of the front windshield pane in the passenger compartment is lower than the air due point temperature in the passenger compartment due to a difference in temperature between the front windshield pane surface temperature detecting device 18 and the air dew point temperature detecting device 19 so that the front air windshield pane is fogged by dewing, sucked air is once cooled and dehumidified, and thus dehumidified air is reheated in order to carry out dehumidification.

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 an electrically driven vehicle for air conditioning the interior of an electrically driven vehicle.

[0002]

2. Description of the Related Art In a conventional fuel-driven vehicle air conditioner, for example, as shown in FIG. 2 (a), the cooling action is to drive a compressor 1 for compressing a refrigerant by an engine. After the vehicle exterior air heat exchanger 2 and the vehicle exterior air heat exchanger blower 3 radiate heat to the vehicle exterior air to condense and liquefy the refrigerant, the refrigerant is passed through the expansion valve 4 and used for the vehicle interior air heat exchanger. The refrigerant is guided to the vehicle interior air heat exchanger 9 which is arranged so as to surround the air blower 5 and which is arranged in the ventilation circuit 8 which connects the air introduction port 6 and each of the vehicle interior air outlets 7, where the air in the vehicle interior is While cooling and dehumidifying, it evaporates and performs a cooling function.

Further, for the heating operation, the compressor 1 is stopped,
Radiator hot water is caused to flow through the heater core 10 arranged in the ventilation circuit 8 via the hot water cock 11 to radiate heat to the air in the passenger compartment.

The temperature of the air blown out from the air outlet 7 in the passenger compartment is controlled by adjusting the opening of the mix damper 12 arranged in the ventilation circuit 8 and bypassing the heater core 10 with the warm air flowing through the heater core 10. It was performed by adjusting the amount of cold air to be blown. Further, in the conventional configuration, the compressor 1 is driven by the engine, the vehicle interior air heat exchanger 9 cools and dehumidifies the air, and the heater core 10 reheats the air to perform dehumidification operation. It was also possible.

In the air conditioner for an electrically driven vehicle, the cooling action is the same as the above, but the heating action cannot use the engine water temperature, so the dotted line portion of FIG.
As shown in (b), the four-way switching valve 13 is used downstream of the compressor 1 to reverse the refrigerant flow path, and the passenger compartment air heat exchanger 9 radiates heat to the passenger compartment air to condense and liquefy the refrigerant. It was necessary to conduct heat pump heating in which the refrigerant is guided to the outside air heat exchanger 2 via the expansion valve 4, where the air outside the passenger compartment is cooled and dehumidified while the refrigerant absorbs and evaporates.

An example in which the four-way switching valve 13 is used to reverse the flow path of the refrigerant and to perform air conditioning by heat pump heating is described in JP-A-3-90430.

[0007]

During a dehumidifying operation that requires reheating, an electrically driven vehicle does not have engine exhaust heat, and therefore it is a problem to effectively use another heat source instead.

Since the capacity of the storage battery is limited in the electrically driven vehicle, it is necessary to make each device highly efficient and consume less power.

The above is a problem in using the heat pump cooling and heating in an air conditioner for an electrically driven vehicle.

The present invention is intended to solve the above problems, and it is an object of the present invention to make effective use of other heat sources, to enable dehumidifying air-conditioning operation in an electrically driven vehicle, and to achieve high efficiency and low power consumption. It is what

[0011]

In order to solve the above problems, the present invention provides a compressor, an air blower for a vehicle interior air heat exchanger,
An air introduction port that is arranged so as to surround the air blower for the vehicle interior air heat exchanger, a ventilation circuit that connects between the vehicle interior air outlets, and a first vehicle interior air heat exchanger that is disposed upstream of the ventilation circuit. ,
A second vehicle interior air heat exchanger arranged downstream in the ventilation circuit, a first refrigerant expansion device arranged between the two vehicle interior air heat exchangers, a vehicle exterior air heat exchanger, and a vehicle. An air blower for an outdoor air heat exchanger, the first vehicle interior air heat exchanger, a second refrigerant expansion device arranged between the vehicle exterior air heat exchangers, and a heat pump cooling and heating device including a four-way switching valve A vehicle interior front window glass surface temperature detection device, a vehicle interior air dew point temperature detection device, and a control device for controlling the two refrigerant expansion devices and the four-way switching valve are provided.

[0012]

With the two throttle devices and the four-way switching valve controlled by the temperature difference between the vehicle interior front window glass surface temperature detection device and the vehicle interior air dew point temperature detection device and the operation mode,
In the heating mode operation and the cooling mode operation, two vehicle interior air heat exchangers can be used. Furthermore, due to the temperature difference between the vehicle interior front window glass surface temperature detection device and the vehicle interior air dew point temperature detection device, the vehicle interior front window glass surface temperature becomes lower than the vehicle interior air dew point temperature, and the vehicle interior front window glass becomes cloudy due to dew condensation. In the case of 1, the dehumidifying operation can be performed by once cooling and dehumidifying the intake air and then heating the dehumidified air again.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner for an electrically driven vehicle according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an air conditioner for an electrically driven vehicle according to an embodiment of the present invention as set forth in claim 1.

As shown in FIG. 1, a compressor 1, a blower device 2 for the vehicle interior air heat exchanger, and an air inlet 6 and air outlets for the vehicle interior are arranged so as to surround the blower device 2 for the vehicle interior air heat exchanger. 7. A ventilation circuit 8 connecting 7 and a first vehicle interior air heat exchanger 14 disposed on the upstream side in the ventilation circuit 8 and a second vehicle interior air heat exchange disposed on the downstream side in the ventilation circuit 8. The first refrigerant expansion device 16 disposed between the air conditioner 15 and the two vehicle interior air heat exchangers 14, 15; the vehicle exterior air heat exchanger 2; the vehicle exterior air heat exchanger blower 3; Second installed between the vehicle interior air heat exchanger 14 and the vehicle exterior air heat exchanger 2
Of the refrigerant expansion device 17 and the four-way switching valve 13, a heat pump cooling and heating device, a vehicle interior front window glass surface temperature detection device 18, a vehicle interior air dew point temperature detection device 19, the two refrigerant expansion devices 16, 17 and Four-way switching valve 1
A control device 20 for controlling 3 is provided.

In the electric drive vehicle air conditioner configured as described above, in the heating mode, the four-way switching valve 13 is switched as shown by the solid line in the figure, the first refrigerant expansion device 16 is opened, and the second refrigerant expansion device 16 is opened. After squeezing the refrigerant expansion device 17, the first and second vehicle interior air heat exchangers 14 and 15 downstream of the compressor 1 that compresses the refrigerant radiate heat to the vehicle interior air to condense and liquefy the refrigerant. The refrigerant is introduced into the vehicle exterior air heat exchanger 2 via the second refrigerant expansion device 17, and the heat pump heating operation is performed in which the refrigerant absorbs and evaporates while cooling and dehumidifying the air outside the vehicle.

Further, in the cooling mode, the four-way switching valve 13 is switched as shown by the dotted line in the drawing, the first refrigerant expansion device 16 is opened, and the second refrigerant expansion device 17 is throttled to compress the refrigerant. 1 and heat is radiated to the air outside the vehicle compartment in the vehicle exterior air heat exchanger 2 to condense and liquefy the refrigerant, and then the refrigerant is passed through the second refrigerant expansion device 17 to the first and second vehicle compartments. The refrigerant is introduced into the air heat exchangers 14 and 15, where the air in the vehicle compartment is cooled and dehumidified while evaporating and the cooling operation is performed.

Further, due to the temperature difference between the vehicle interior front window glass surface temperature detection device 18 and the vehicle interior air dew point temperature detection device 19, the vehicle interior front window glass surface temperature becomes lower than the vehicle interior air dew point temperature, and the vehicle interior front window glass. When it becomes cloudy due to dew condensation, the four-way switching valve 13 is switched as shown by the solid line, the first refrigerant expansion device 16 is throttled, and the second refrigerant expansion device 17 is opened. As a result, the second vehicle interior air heat exchanger 15 downstream of the compressor 1 that compresses the refrigerant radiates heat to the vehicle interior air to condense and liquefy the refrigerant, and then the refrigerant is first squeezed by the first refrigerant expansion device 16. Through the first passenger compartment air heat exchanger 1
4 and the vehicle exterior air heat exchanger 2, where a cycle in which the refrigerant absorbs and evaporates while cooling and dehumidifying the air can be configured, and the first vehicle interior air heat exchanger 14 cools the air.
The dehumidification operation of dehumidifying and reheating the air in the second vehicle interior air heat exchanger 15 becomes possible.

Although the blower device 5 for the vehicle interior air heat exchanger has been described as a push type in the drawing, in the suction type, the first vehicle interior air heat exchanger 14 and the second vehicle interior air heat exchanger are arranged from the upstream side. The same effect can be obtained by arranging the ventilation device 5 for the vehicle interior air heat exchanger 15 in the ventilation circuit 8 in this order. Further, the same effect can be obtained by arranging the first vehicle interior air heat exchanger 14, the vehicle interior air heat exchanger blower 5, and the second vehicle interior air heat exchanger 15 in this order from the upstream side in the ventilation circuit 8. Is obtained.

It is also possible to install an auxiliary electric heater in the ventilation circuit 8, the air introduction port 6 portion, or each of the vehicle interior air outlets 7 portion in order to provide a further immediate warming property. ..

[0021]

The dehumidifying operation requiring reheating can be performed within the cycle of the heat pump device without using any other heating element such as an electric heater, and power consumption can be suppressed.
Further, during the heating mode operation and the cooling mode operation, since the two vehicle interior air heat exchangers can be used, the heating and cooling capacities and efficiency are improved, and the power consumption can be suppressed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an air conditioner for an electrically driven vehicle according to an embodiment of the present invention.

FIG. 2A is a configuration diagram of a conventional air conditioner for a vehicle driven by a fuel engine, and FIG. 2B is a configuration diagram of a main part of a conventional air conditioner for an electrically driven automobile.

[Explanation of symbols]

 1 Compressor 2 Outside air heat exchanger for vehicle 3 Air blower for outside air heat exchanger for vehicle 4 Expansion valve 5 Air blower for air heat exchanger for passenger compartment 6 Air inlet 7 Air outlets for passenger compartment 8 Ventilation circuit 9 Air heat exchanger for passenger compartment Container 10 Heater core 11 Hot water cock 12 Mix damper 13 Four-way switching valve 14 Vehicle interior air heat exchanger 15 Vehicle interior air heat exchanger 16 Refrigerant expansion device 17 Refrigerant expansion device 18 Vehicle interior front glass surface temperature detection device 19 Vehicle interior air dew point temperature Detection device 20 Control device

Claims (1)

[Claims] 1. A blower for a compressor, a vehicle interior air heat exchanger,
A ventilation circuit which is arranged so as to surround the air blower for the vehicle interior air heat exchanger and which connects between the air inlet and each of the vehicle interior air outlets, and a first vehicle interior air heat exchanger which is disposed upstream of the ventilation circuit. A second vehicle interior air heat exchanger arranged downstream in the ventilation circuit, a first refrigerant expansion device arranged between the two vehicle interior air heat exchangers, a vehicle exterior air heat exchanger, A heat pump cooling / heating system including a blower device for an exterior air heat exchanger, a second refrigerant expansion device arranged between the first interior air heat exchanger and the exterior air heat exchanger, and a four-way switching valve An air conditioner for an electrically driven vehicle, comprising: an apparatus, a vehicle interior front window glass surface temperature detection apparatus, a vehicle interior air dew point temperature detection apparatus, and a control device that controls the two refrigerant expansion devices and the four-way switching valve.