JPH04372422A - Controlling device for air conditioner for automobile - Google Patents

Abstract

PURPOSE:To provide a controlling device for an air conditioner for an automobile with which a compressor load can be reduced to increase a cooling ability without stopping a compressor by controlling a flow regulator or a flow control valve when the load exceeds a predetermined value. CONSTITUTION:A generator 3 for converting power from an engine 1 into an electric energy is provided, a low voltage bypass circuit having a flow control valve is provided in a freezing circuit, and a controller for controlling at least either one or both of a flow regulator 7 or the flow control valve 9 when a compressor load exceeds a predetermined value is provided.

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 automobile equipped with an electric compressor.

0002

2. Description of the Related Art Conventionally, this type of automotive air conditioner has been disclosed, for example, in Japanese Patent Application Laid-open No. 116922/1983.
When the load on the compressor became too high, the compressor's rotational speed was lowered, and when it got even higher, the compressor was temporarily stopped and restarted after 3 minutes to return to the set value.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned automobile air conditioner, when the external heat load is large and the engine speed changes frequently, such as when driving in traffic jams, the load increases and the compressor temporarily stops. Then, it is necessary to wait several minutes to restart the compressor, which poses problems in terms of cooling capacity and comfort.

0004

[Means for Solving the Problems] In order to solve the above problems, the present invention provides at least a generator that converts power from an engine into electrical energy, an electric compressor, a four-way valve, an outdoor heat exchanger, A refrigerant circuit is constituted by a flow rate adjustment device that controls the refrigerant flow rate and an indoor heat exchanger, and the refrigerant circuit is provided with a high-low pressure bypass circuit having a flow rate adjustment valve, and when the load of the compressor exceeds a predetermined value, A control device for controlling either one or both of the flow rate adjustment device and the flow rate adjustment valve is provided.

[0005]

[Operation] According to the above-described structure, when the load on the compressor exceeds a specified value, the present invention can load the compressor without stopping the compressor by controlling either the flow rate adjustment device or the flow rate adjustment valve, or both. Reduce.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for an automobile air conditioner according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. From the car engine 1 to the generator 3 via the belt 2
receives power and converts it into electrical energy. The converted electrical energy enters the control device 10 and is input as a power source for driving the compressor 4. When the compressor is driven by the control device 10, the compressed and heated refrigerant passes through the heating/cooling switching four-way valve 5;
The outdoor heat exchanger 6 exchanges heat with outdoor air and condenses the air. The condensed refrigerant is depressurized by a flow rate adjustment device 7 that adjusts the refrigerant flow rate, enters the indoor heat exchanger 8, passes through the four-way valve 5, returns to the compressor 4, constitutes a refrigeration circuit, and further increases the flow rate to the refrigeration circuit. High and low pressure bypass circuit 9 with regulating valve
has been established. The control device 10 controls the compressor based on at least a heat load such as internal and external air temperature, and controls either or both of the flow rate adjustment device 7 and the flow rate adjustment valve 9 when the load on the compressor exceeds a predetermined value. It is something to do.

FIG. 2 is a characteristic diagram showing changes in the high pressure side and the low pressure side with respect to elapsed time when the compressor is immediately stopped from the operating state when the refrigeration circuit having the above configuration is not controlled by the control device. is.

[0009] Figure 3 is a characteristic diagram showing the amount of rush current depending on the compression ratio, where the ratio of high pressure and low pressure of the compressor is taken as the compression ratio.

From FIGS. 2 and 3, when the flow rate adjustment device 7 or the flow rate adjustment valve pressure equalization 9 is not operated, it takes two minutes for the high and low pressures to equalize, and if the compressor is restarted before the pressure is equalized, , a rush current flows through the compressor depending on the compression ratio, making it impossible to restart the compressor. Therefore, in the present invention, when the compressor load exceeds a predetermined value, when a signal from the control device 10 is output to the flow rate adjustment valve 9, the flow rate adjustment valve opens and bypasses the high and low pressures of the refrigeration cycle. The load can be reduced without stopping the system. The same effect can also be obtained by controlling the flow rate adjustment device 7 to increase the refrigerant flow rate.

[0011]

As described above, the automotive air conditioner of the present invention is equipped with at least a generator that converts power from an engine into electrical energy, an electric compressor control device, an outdoor heat exchanger, and a flow rate control device. A refrigerant circuit is configured by a regulating device and an indoor heat exchanger, and the refrigerant circuit is provided with a high-low pressure bypass circuit having a flow regulating valve, and when the load of the compressor exceeds a predetermined value, the flow regulating device or,
By controlling one or both of the flow rate regulating valves, the load can be reduced without stopping the compressor, and the cooling capacity and comfort can also be improved.

[Brief explanation of drawings]

[Fig. 1] Configuration diagram in one embodiment of the present invention

[Figure 2] Characteristic diagram showing the amount of change in high and low pressures

[Figure 3] Characteristic diagram showing rush current for the same compression ratio

[Explanation of symbols]

1 Engine 2 Belt 3 Generator 4 Compressor 5 Four-way valve 6 Outdoor heat exchanger 7 Flow rate adjustment device 8 Indoor heat exchanger 9 Pressure equalization device 10 Control device

Claims (1)

[Claims] Claim 1: At least a generator that converts power from an engine into electrical energy, and an electric compressor;
A refrigerant circuit is composed of a four-way valve, an outdoor heat exchanger, a flow rate adjustment device, and an indoor heat exchanger, and a high and low pressure bypass circuit with a flow rate adjustment valve is installed, and when the compressor load exceeds a specified value. A control device for an air conditioner for an automobile, comprising a control device that sometimes controls either or both of the flow rate adjustment device and the flow rate adjustment valve.