JP2776121B2 - Air conditioner for electric drive vehicle - Google Patents

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 electric drive vehicle which air-conditions the interior of a vehicle of an electric drive vehicle.

[0002]

2. Description of the Related Art A conventional air conditioner for a fuel-engine vehicle is, for example, as shown in FIG. 3 (a), in which a compressor 1 for compressing a refrigerant is driven by an engine so as to generate heat outside the vehicle compartment. After the heat is radiated to the outside air of the vehicle by the exchanger 2 and the blower 3 for the outside air heat exchanger to condense and liquefy the refrigerant, the refrigerant is guided to the inside air heat exchanger 5 through the expansion valve 4. The air in the vehicle compartment is cooled and dehumidified by the blower 6 for the vehicle interior air heat exchanger to evaporate and perform a cooling function. The heating operation is performed by a hot water heater using the engine water temperature.

In an air conditioner for an electric drive vehicle, the cooling action is the same as above, but the heating action cannot use the above engine water temperature, so the dotted line in FIG.
As shown in (b), the refrigerant flow path is reversed by using the four-way switching valve 7 downstream of the compressor 1, and the refrigerant is condensed and liquefied by releasing heat to the vehicle interior air by the vehicle interior air heat exchanger 5. To the outside air heat exchanger 2 through the expansion valve 4, where it is necessary to perform heat pump heating in which the refrigerant absorbs heat and evaporates while cooling and dehumidifying the outside air.

[0004] Japanese Patent Application Laid-Open No. 3-90430 discloses an example in which an air conditioner for a fuel engine vehicle performs air conditioning by heat pump heating using engine exhaust heat. In the heat pump heating mode, the refrigerant in the outside air heat exchanger becomes low temperature, so that dehumidified water from the air forms frost and ice on the outside air heat exchanger,
Since the heat exchange with the air of the vehicle exterior air heat exchanger becomes impossible, a defrosting operation for removing frost and freezing of the vehicle exterior air heat exchanger is required. The mode is switched in the same manner as in the mode, and the outdoor air heat exchanger is set to a high temperature to perform the defrosting operation. During the defrosting operation,
Since defrosting cannot be performed when the outdoor air heat exchanger exchanges heat with air, the outdoor air heat exchanger blower is stopped to perform the defrosting operation in the heating mode.

[0005]

During the defrosting operation in the heating mode by the heat pump heating, the temperature of the air heat exchanger in the vehicle compartment becomes low, and the moisture in the air forms frost on the air heat exchanger in the vehicle. At the end of the defrosting operation in the mode, by switching the four-way switching valve to the heating mode, the vehicle interior air heat exchanger becomes high temperature, and the air containing moisture frosted on the vehicle interior air heat exchanger is directed to the window direction and face. When the air is blown out in the direction , the dew forms on the surface of the window in the passenger compartment, and the window becomes cloudy. Therefore, it is necessary to prevent the blowing of the high-humidity air at the end of the defrosting operation.

[0006] The above is a problem when using the heat pump cooling and heating in an air conditioner for an electric drive vehicle.

An object of the present invention is to solve the above-mentioned problem and to prevent the fogging of a window immediately after switching to a heating operation at the end of a defrosting operation.

[0008]

(1) In order to solve the above-mentioned problems, according to the present invention, during a heating mode defrosting operation, a blower for an air heat exchanger inside a vehicle and a blower for an air heat exchanger outside a vehicle are stopped. The direction of the air in the cabin is the window direction and the face direction
At the end of the heating mode defrosting operation, a control device is provided which restarts the blower for the vehicle interior air heat exchanger at a fixed time after starting the heating mode operation.

(2) In order to solve the above problems, the present invention provides a method for stopping a blower for a vehicle interior air heat exchanger and a blower for an external air heat exchanger during a heating mode defrosting operation.
At the end of the heating mode defrosting operation, the air blowing direction in the vehicle compartment is forcibly switched only to the foot direction, and after a certain period of time after starting the heating mode operation, the air blowing direction in the vehicle compartment is changed from the foot direction to the original direction . Equipped with a control device for returning to the state.
You.

[0010]

(1) In the present invention, the air blower for the vehicle interior air heat exchanger and the air blower for the air heat exchanger outside the vehicle are stopped during the defrosting operation in the heating mode, and the air blowing direction of the vehicle interior is changed to the window direction and the face direction.
At the end of the heating mode defrosting operation, the vehicle interior air heat exchanger blower is restarted at a fixed time after starting the heating mode operation, so that when the defrosting operation is completed, Since the frost that has condensed on the air heat exchanger during the defrost operation can be discharged as dehumidified water,
Prevents high-humidity wind from blowing out toward the window and face
Because high humidity air is not directly applied to the windows in the passenger compartment.
It is possible to prevent the fogging of the window due to dew condensation in the room .

(2) The present invention relates to a heating mode defrosting operation,
The air blower for the air heat exchanger inside the vehicle and the air blower for the air heat exchanger outside the vehicle are stopped, and when the defrosting operation in the heating mode is completed, the air blowing direction in the vehicle compartment is forcibly switched to only the foot direction and the heating mode operation is started. After performing a control to return the air blowing direction in the vehicle compartment to the normal blowing direction after a certain period of time, when the defrosting operation is completed, the high humidity wind in the window direction and the face direction immediately after the heating operation switching is performed. Can be prevented, and high-humidity air is not directly applied to the vehicle interior window, so that it is possible to prevent clouding of the window due to condensation on the surface of the vehicle interior window.

[0012]

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

It is an object of the present invention to prevent the fogging of a window immediately after switching to heating when the defrosting operation is completed.

FIG. 1 is a system diagram of an embodiment of an air conditioner for an electric drive vehicle according to the present invention.

In FIG. 1, the compressor 1, the outside air heat exchanger 2, the outside air heat exchanger 3, the expansion valve 4, the inside air heat exchanger 5, and the inside air heat exchanger 6 are shown. ,
During the defrosting operation in the heating mode to the outside, the four-way switching valve 7 stops the ventilation device 6 for the vehicle interior air heat exchanger and the ventilation device 3 for the exterior air heat exchanger, and the direction of the vehicle interior air blowing is window
At the end of the heating mode defrosting operation in the direction and the face direction, a control device 8 is provided which restarts the blower 6 for the vehicle interior air heat exchanger after a certain time from the start of the heating mode operation. Since the flow of the refrigerant is the same as that of the conventional example, the description is omitted.

In the air conditioner for an electric drive vehicle configured as described above, the air blower 6 for the vehicle interior air heat exchanger and the air blower 3 for the external air heat exchanger during the defrosting operation in the heating mode. Stops and the airflow direction inside the vehicle is toward the window
At the end of the heating mode defrosting operation in the face direction, control is performed to restart the blower 6 for the vehicle interior air heat exchanger after a predetermined time from restarting the heating mode operation. Above system
By performing the control, during the defrosting operation in the heating mode, by stopping the blower 3 for the outside air heat exchanger, the heat exchange of the outside air heat exchanger 2 is suppressed, and the defrosting operation becomes possible. By stopping the blower 6 for the vehicle interior air heat exchanger, it is possible to prevent the blowing of cool air into the vehicle interior. In addition, the direction of air blowing in the cabin is
At the end of the defrosting operation, a certain period of time
By stopping the wind device 6, the frost condensed during the defrosting operation can be discharged to the vehicle interior air heat exchanger 5 as dehumidifying water, so that the height in the window direction and the face direction immediately after the heating operation switching is performed. Humidity wind can be prevented from blowing out directly into the cabin
The surface of the window inside the cabin is not exposed to high humidity air
It is possible to prevent clouding of the window due to dew condensation .

Another object of the present invention is to prevent the fogging of a window immediately after switching to the heating operation at the end of the defrosting operation.

FIG. 2 is a system diagram of an air conditioner for an electric drive vehicle according to a second embodiment of the present invention.

In FIG. 2, the compressor 1, the outside air heat exchanger 2, the outside air heat exchanger 3 for the outside air, the expansion valve 4, the inside air heat exchanger 5, the inside air heat exchanger 6 are shown. ,
A ventilation circuit 9 for blowing out the air exchanged by the four-way switching valve 7 and the air heat exchanger 5 toward the face in the vehicle interior; A ventilation circuit 10 that blows out in the direction of the feet, a ventilation circuit 11 that blows out the air heat exchanged by the vehicle interior air heat exchanger 5 toward the window in the vehicle interior, An opening / closing device 12 for opening / closing the ventilation circuit 9 and a switching device 13 for opening / closing the ventilation circuit 10 are connected to the discharge side of the exchanger 5 and connected to the ventilation circuits 9, 10, 11. An opening / closing device 14 for opening / closing the ventilation circuit 11 is installed. When the defrosting operation is performed on the outside in the heating mode, the blowing device 6 for the vehicle interior air heat exchanger and the blowing device 3 for the external air heat exchanger are stopped, At the end of the heating mode defrosting operation, each of the switching devices 12 Regardless of the position of the switches 13 and 14, the switchgear 13 is forcibly opened, the switchgear 12 and the switchgear 14 are closed, and the air blowing direction in the vehicle compartment is forcibly limited to the foot direction only. A control device 15 is provided which returns the air blowing direction in the vehicle compartment to the set normal blowing direction before the forcible switching of the air blowing direction is performed at a fixed time after the switching and heating mode operation is started.

In the air conditioner for an electric drive vehicle configured as described above, the air blower 6 for the vehicle interior air heat exchanger and the air blower 3 for the external air heat exchanger are stopped during the heating mode defrosting operation. At the end of the heating mode defrosting operation, the air blowing direction in the passenger compartment is forcibly switched only to the foot direction,
After a certain period of time from the start of the heating mode operation, control is performed to return the air blowing direction in the vehicle compartment to the normal blowing direction. By performing the above control in each operation mode, during the defrosting operation in the heating mode, the heat exchange of the outside air heat exchanger 2 is suppressed by stopping the blower 3 for the outside air heat exchanger, The defrosting operation becomes possible, and the blowing of the cool air into the vehicle interior can be prevented by stopping the blower 6 for the vehicle interior air heat exchanger. At the end of the defrosting operation, it is possible to prevent blowing of high-humidity wind in the window direction and the face direction due to melting of frost condensed during the defrosting operation in the vehicle interior air heat exchanger 5, and high humidity can be prevented. Since the air is not directly applied to the vehicle interior window, it is possible to prevent the clouding of the window due to condensation on the surface of the window in the vehicle interior.

[0021] immediately after the heating operation switching at the end of the defrosting operation
The blowing of high-humidity wind toward the window and the face can be prevented, and clouding of the window can be prevented by not directly blowing high-humidity air on the window.

[0022]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an air conditioner according to claim 1 of the present invention.

FIG. 2 is a configuration diagram of an embodiment of an air conditioner according to claim 2 of the present invention.

FIG. 3A is a configuration diagram of a conventional cooling air conditioner for a vehicle driven by a fuel engine, and FIG. 3B is a configuration diagram of a conventional air conditioning device for an electric drive vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Outside air heat exchanger 3 Blower for outside air heat exchanger 4 Expansion valve 5 Inside air heat exchanger 6 Blower for inside air heat exchanger 7 Four-way switching valve 8 Control device 9 Ventilation circuit 10 Ventilation Circuit 11 Ventilation circuit 12 Switchgear 13 Switchgear 14 Switchgear 15 Controller

Claims (2)

(57) [Claims] 1. A compressor, a vehicle exterior air heat exchanger, a ventilation device for a vehicle exterior air heat exchanger, an expansion valve, a vehicle interior air heat exchanger, a ventilation device for a vehicle interior air heat exchanger, and a four-way switching valve. The heat pump air conditioner and the air blower for the vehicle interior air heat exchanger and the air blower for the air heat exchanger outside the vehicle are stopped during the heating mode defrosting operation, and the air blowing direction in the vehicle interior is stopped.
A control device for restarting the air blower for the vehicle interior air heat exchanger at a fixed time after starting the heating mode operation at the end of the heating mode defrosting operation in the window direction or the face direction . Air conditioner. 2. A compressor, a vehicle exterior air heat exchanger, a ventilation device for a vehicle exterior air heat exchanger, an expansion valve, a vehicle interior air heat exchanger, a ventilation device for a vehicle interior air heat exchanger, and a four-way switching valve. A heat pump cooling and heating device, a ventilation circuit that blows out the heat exchanged air in the cabin air heat exchanger in the direction of the face in the cabin, and the air that has been heat exchanged in the cabin air heat exchanger in a footstep direction in the cabin. A ventilation circuit for blowing air exchanged in the vehicle interior air heat exchanger toward a window in the vehicle interior, respective opening and closing devices for opening and closing the three ventilation circuits, and a heating mode defrosting unit. The air blower for the vehicle interior air heat exchanger and the air blower for the external air heat exchanger are stopped during operation, and when the defrosting operation in the heating mode is completed, the air blowing direction in the vehicle interior is forcibly switched to only the footstep direction. Start driving Electric powered vehicle air conditioning apparatus including a control device for returning to the original state of air blowing direction of the passenger compartment from the ground direction at a certain time.