Control device and control method for variable-displacement compressor of air conditioner

Abstract

The invention relates to a control device of a variable-displacement compressor of an air conditioner, and the control device comprises an internal temperature control module, an air-out temperature control module and a compressor control module. The internal temperature control module calculates the target air-out temperature at least on the basis of the set temperature of the air conditioner as well as the temperature inside a car and the temperature outside the car. The air-out temperature control module calculates the target temperature of an evaporator on the basis of the temperature outside the car, the set temperature of the air conditioner and the temperature inside the car, and the target temperature of the evaporator is approximate to the target air-out temperature; the compressor control module comprises an evaporator temperature control unit which controls the displacement of the compressor by adopting a PID (Proportion Integration Differentiation) control algorithm on the basis of the target temperature of the evaporator and the currently measured temperature of the evaporator. The control device of the variable-displacement compressor of the air conditioner accurately controls the electric current of an electric control valve of the compressor fully based on the target temperature of the evaporator and the current temperature of the evaporator, so as to achieve the purpose of the accurate displacement of the compressor, and the refrigeration effect of the air conditioning system achieves expectation of users as soon as possible and stabilizes afterwards.

Description

Technical field [0001] The present invention relates to the control of a variable displacement compressor of an air conditioner, in particular to a control device and a control method of an externally controlled variable displacement compressor of a vehicle-mounted air conditioner. Background technique [0002] With the rapid development of the automobile industry, people's requirements for the performance and comfort of automobile air conditioners are constantly increasing. The existing non-independent fixed displacement compressor automobile air conditioning system has been difficult to meet user requirements. On the one hand, in the case of large temperature fluctuations in the car, the irreversible loss caused by the frequent start and stop of the non-independent fixed displacement compressor automobile air conditioning system increases the system energy consumption; on the other hand, the fixed displacement compressor Periodic clutches cause serious interference to the work...

AI Technical Summary

Problems solved by technology

[0004] The control device of the existing externally controlled variable displacement compressor adopts an open-loop control method when controlling the compressor, which leads to unstable temperature adjustment of the air conditioner, which is not fast and accurate enough

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