JPH07144531A - Control device for automobile motor-driven air conditioner - Google Patents

Abstract

PURPOSE:To reduce the maximum load torque and maximum power consumption of a motor-driven compressor driving motor at the time of starting operation by setting the rotating speed of a motor-driven compressor to the specified value less than the maximum value at the time of starting the operation of an air conditioner, and increasing the rotating speed of the motor-driven compressor to the maximum value with the lapse of time. CONSTITUTION:A control unit 7 for an automobile motor-driven air conditioner sets the rotating speed of a motor-driven compressor 2 to the specified value less than the maximum value at the time of starting the operation of the air conditioner and increases the rotating speed stepwise to the maximum value with the lapse of time. The time required to increase the rotating speed to the maximum value from the initial set value is about 5 minutes, for instance. As a result, the temperature in the vehicle interior gradually approaches the set temperature with the lapse of time, and the load torque of a motor-driven compressor driving motor 22 is increased with the lapse of time and then reduced. The time required for the vehicle interior temperature to gradually approach the set value thereby becomes long to some extent, taut the maximum value or the load torque or the motor-driven compressor driving motor 22 is lowered, and the efficiency of the compressor is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric air conditioner for an automobile.

[0002]

2. Description of the Related Art FIG. 1 is a structural example of an electric air conditioner for an electric vehicle. Inverter 21 having switching transistor 21a and drive circuit 21b in DC power supply 1
And a motor 22 and a compressor 23 driven by the motor 22
An electric compressor 2 including is connected. The refrigerant discharged from the electric compressor 2 is discharged to the refrigerant circuit 5 of the air conditioner including the outdoor heat exchanger 3, the indoor heat exchanger 4, a liquid receiver (not shown), and an expansion valve. The flow path of the refrigerant in the refrigerant circuit 5 is switched by a four-way valve (not shown). Thereby, the indoor heat exchanger 4 functions as an evaporator during the cooling operation and as a condenser during the heating operation. A blower 6 is arranged adjacent to the indoor heat exchanger 4. The blowout temperature signal from the blowout temperature sensor disposed adjacent to the indoor heat exchanger 4 and the vehicle interior temperature setting signal are input to the control unit 7 of the air conditioner, and the control unit 7 of the air conditioner is input. Outputs a target rotation speed signal to the drive circuit 21b of the inverter.

Control unit 7 of air conditioner
Calculates the target outlet temperature, and thus the target rotational speed of the electric compressor 2, based on the outlet temperature signal and the vehicle compartment temperature setting signal, and outputs the target rotational speed signal to the drive circuit 21b of the inverter. Thereby, the rotation speed of the electric compressor 2 is controlled, and by extension, the blowout temperature of the indoor heat exchanger 4 is controlled.
On the other hand, the control unit 7 of the air conditioner calculates the blower air volume corresponding to the target blowout temperature based on a predetermined diagram, outputs a control signal to the drive circuit of the blower 6, and rotates the rotation speed of the blower drive motor. To control. Thereby, the blower air volume is controlled. In the electric air conditioner for automobiles described above, conventionally, in order to quickly reach a desired air conditioning state and give a passenger a comfortable feeling at the time of starting heating operation or cooling operation, the electric compressor 2 and the blower are used. 6 and 6 were controlled to operate at the maximum rotation speed.

[0004]

Since the heat load of the air conditioner is large at the start of operation and decreases with the passage of time, the load torque and power consumption of the electric compressor drive motor 22 are the same as the rotation of the electric compressor 2. If the number is constant, it becomes maximum immediately after the start of operation and decreases with the passage of time.
Further, the maximum load torque and the maximum power consumption increase as the rotation speed of the electric compressor 2 increases. Therefore, the electric compressor 2 of the electric air conditioner for a vehicle is
When the air conditioner is operated at the maximum rotation speed at the start of operation, the maximum load torque of the electric compressor drive motor 22 is increased, the compressor drive motor 22 is increased in size, and the maximum power consumption is increased. Cause The present invention has been made in view of the above problems, while ensuring the comfort of the occupant as much as possible, at the start of operation of the air conditioner,
It is possible to reduce the maximum load torque and the maximum power consumption of the electric compressor drive motor 22, and thus the electric compressor drive motor 22.
It is an object of the present invention to provide a control device for an electric air conditioner for a vehicle, which can be downsized.

[0005]

In order to solve the above problems, according to the present invention, in a control device for an electric air conditioner for an automobile, the maximum number of rotations of the electric compressor is set at the start of operation of the air conditioner. There is provided a control device comprising means for setting a predetermined value smaller than the predetermined value and increasing the rotation speed of the electric compressor to a maximum value with the lapse of time. In a preferred aspect of the present invention, the control device includes means for setting the blower air flow rate to a predetermined value smaller than the maximum value at the start of operation of the air conditioner, and increasing the air flow rate to the maximum value over time.

[0006]

In the present invention, when the operation of the air conditioner is started, the rotation speed of the electric compressor is set to a predetermined value smaller than the maximum value, and is increased to the maximum value over time. As a result, the maximum load torque and the maximum power consumption of the electric compressor drive motor at the start of operation of the air conditioner are reduced, and the electric compressor drive motor can be downsized. By appropriately setting the rotation speed at the start of operation and the time required to increase the amount to the maximum value, the comfort of the occupant can be maintained as much as possible. In addition to the rotation speed of the electric compressor,
The air volume of the blower is also set to a predetermined value that is smaller than the maximum value at the start of the operation of the air conditioner, and by increasing it to the maximum value over time, the blown air temperature of the indoor heat exchanger is adjusted at the start of the operation of the air conditioner. The electric compressor and the blower can be maintained at the same values as when operating at the maximum rotation speed.
As a result, although the cooling capacity immediately after the start of the air conditioner decreases, it is possible to give the occupant a feeling of cool air and maintain the occupant's comfort.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described based on the time chart of FIG. The configuration of the electric air conditioner for a vehicle including the control device according to the present embodiment is the same as that shown in FIG. In the present embodiment, the control unit 7 of the electric air conditioner for an automobile, as shown by the solid line in FIG.
Is set to a predetermined value that is smaller than the maximum value, and the amount is gradually increased to the maximum value with the lapse of time. The time required to increase the amount from the initial set value to the maximum value is, for example, about 5 minutes. As a result, the temperature inside the vehicle interior gradually approaches the set temperature over time, and the load torque of the electric compressor drive motor 22 increases and then decreases over time. When the electric compressor 2 is operated at the maximum rotation speed as indicated by the broken line at the start of the operation of the air conditioner, the temperature inside the vehicle interior and the load torque of the electric compressor drive motor 22 are indicated by the broken line as time passes. It changes as shown. As shown in FIG. 2, in the present embodiment, the time required for the temperature in the vehicle interior to gradually approach the set value is slightly longer than in the conventional control, but the load torque of the electric compressor drive motor 22 is The maximum value is reduced and the efficiency of the compressor is improved. Therefore, the maximum value of power consumption is lower than that in the conventional control, and the electric compressor drive motor 22 can be downsized. By appropriately setting the rotation speed at the start of operation and the time required for increasing the amount to the maximum value, the comfort of the occupant can be maintained as much as possible.

In the second embodiment of the present invention, in addition to the control of the first embodiment, the control unit 7 further comprises
The air volume of the blower 6 is also set to a predetermined value smaller than the maximum value at the start of the operation of the air conditioner, and gradually increases to the maximum value over time. As a result, the blowout temperature of the indoor heat exchanger 4 is set so that the electric compressor 2 is activated when the air conditioner starts to operate.
And the blower 6 are maintained at the same values as those at the maximum rotation speed. As a result, the cooling capacity immediately after the start of the air conditioner decreases, but the occupant can obtain a cool air sensation and the occupant's comfort feeling is maintained. In the above embodiment, the rotational speed of the electric compressor 2 and the blower air volume are increased stepwise to the maximum values with the passage of time, but the rotational speed of the electric compressor 2 and the blower air volume are continuously maximized with the passage of time. The amount may be increased up to.

[0009]

As described above, in the present invention, when the operation of the air conditioner is started, the rotation speed of the electric compressor is set to a predetermined value smaller than the maximum value, and is increased to the maximum value with the lapse of time. As a result, the maximum load torque and the maximum power consumption of the electric compressor drive motor at the start of operation of the air conditioner are reduced, and the electric compressor drive motor can be downsized. By appropriately setting the rotation speed at the start of operation and the time required to increase the amount to the maximum value, the comfort of the occupant can be maintained as much as possible. In addition to the rotation speed of the electric compressor, the air volume of the blower is set to a predetermined value that is less than the maximum value when the air conditioner starts operating, and increases over time to the maximum value, so that the blowout air of the indoor heat exchanger is increased. The temperature can be maintained at the same value as when the electric compressor and the blower are operated at the maximum rotation speed at the start of operation of the air conditioner. As a result, although the cooling capacity immediately after the start of the air conditioner decreases, it is possible to give the occupant a feeling of cool air and maintain the occupant's comfort. Note that the present invention can be applied to an electric air conditioner for general vehicles other than electric vehicles, in which case the present invention contributes to reducing the load on the generator, and thus reducing the size and weight of the generator. To do.

[Brief description of drawings]

FIG. 1 is a configuration example of an electric air conditioner for an electric vehicle.

FIG. 2 is a time chart showing an example of rotation speed control of the electric compressor at the start of operation of the air conditioner according to the embodiment of the present invention.

[Explanation of symbols]

 1 DC power supply 2 Electric compressor 3 Outdoor heat exchanger 4 Indoor heat exchanger 5 Refrigerant circuit 6 Blower

Claims (2)

[Claims] 1. A control device for an electric air conditioner for an automobile, wherein the rotational speed of the electric compressor is set to a predetermined value smaller than a maximum value at the start of operation of the air conditioner, and the electric compressor rotates with time. A control device comprising means for increasing the number to a maximum value. 2. The control according to claim 1, further comprising means for setting the blower air flow rate to a predetermined value smaller than the maximum value at the start of operation of the air conditioner and increasing the air flow rate to the maximum value over time. apparatus.