Control method for degree of superheat of vehicle air-conditioning system and vehicle air-conditioning system

Abstract

The invention provides a control method for the degree of superheat of a vehicle air-conditioning system and the vehicle air-conditioning system. The control method for the degree of superheat of the vehicle air-conditioning system includes the steps that an actual degree of superheat, a preset degree of superheat and front feedback information influencing changes of the actual degree of superheat are obtained in real time; the opening degree of an electronic expansion valve is adjusted in real time according to the obtained actual degree of superheat, the preset degree of superheat and the front feedback information to control the degree of superheat of the vehicle air-conditioning system. According to the control method for the degree of superheat of the vehicle air-conditioning system and the vehicle air-conditioning system, the electronic expansion valve is adopted to serve as a throttling element, except that the actual degree of superheat is adopted to serve as an input parameter to adjust the opening degree of the electronic expansion valve, the opening degree of the electronic expansion valve is also controlled through front feedback information such as the variable quantity of the rotating speed of a compressor and / or variable quantity of the rotating speed of an evaporator fan and the like, and the control method and the vehicle air-conditioning system have the advantages of being high in response speed, more smooth and steady in control over the degree of superheat, and more stable in out air temperature, and improving the comfort level, and the like.

Description

[0001] This application is a divisional application of a patent application with an application date of April 24, 2012, an application number of 201210122508.x, and an invention title of "Vehicle Air Conditioning System Superheat Control Method and Vehicle Air Conditioning System". technical field [0002] The present invention relates to a method for controlling the degree of superheat of a vehicle air-conditioning system and a vehicle air-conditioning system, in particular to a method for controlling an electronic expansion valve through forward feedback information of a compressor and / or an evaporator fan, as well as an actual degree of superheat and a preset degree of superheat The invention discloses a method for controlling the superheat degree of a vehicle air-conditioning system with an opening degree and the vehicle air-conditioning system, belonging to the technical field of automobile air-conditioning. Background technique [0003] The automotive air-conditioning s...

AI Technical Summary

Problems solved by technology

[0009] However, automotive air conditioners are different from household and commercial air conditioners. The operating conditions of automotive air conditioners change very quickly. Simply using superheat to adjust the opening of the electronic expansion valve will have problems such as slow response speed and easy overshoot.

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