Automobile air conditioner electric compressor rotational speed control method

Abstract

The invention relates to the technical field of automobile air conditioners and provides an automobile air conditioner electric compressor rotational speed control method. The automobile air conditioner electric compressor rotational speed control method comprises the following steps of (1) giving different environment temperatures, different evaporator air blower air volumes and different evaporator target temperatures in the experimental process of a test bed, and stabilizing the evaporator temperature at the target temperature by manually adjusting the rotating speed of a compressor; (2) summarizing a correlation formula for calculating the feedforward value according to experimental data; and (3) adding the feedforward value as the system initial rotational speed in the automatic control process to the value calculated through proportional integrals to obtain the dynamic compressor target rotational speed. According to the automobile air conditioner electric compressor rotational speed control method, the rotational speed of the compressor is controlled through the feedforward and PI control method; the rotational speed calculated through the correlation formula can serve as the initial rotational speed of the compressor during starting, and there is no need to conduct segmentation control over the starting process of the compressor. After feedforward control is added, theproportional integration coefficients can all be reduced, and the rotational speed and vibration amplitude of the compressor are reduced. Moreover, the probability of oscillation occurring to the system is greatly reduced.

Description

technical field [0001] The invention relates to a compressor control system in the technical field of air conditioning, in particular to a method for controlling the speed of an electric compressor of an automobile air conditioner using feedforward + PI control. Background technique [0002] With the gradual popularization of new energy vehicles, electric compressors for automotive air conditioners are gradually replacing traditional mechanical compressors. Compared with mechanical compression, the electric compressor has the advantages of wider control range, fast response speed, and is not affected by the speed of the main engine, which can significantly improve the comfort of the air conditioner. [0003] The traditional air-conditioning comfort algorithm usually uses ambient temperature, interior temperature, set temperature, and light intensity to calibrate the cooling and heating demand value TAO of a compartment. In refrigeration conditions, in order to prevent the e...

AI Technical Summary

Problems solved by technology

However, due to the different working conditions of the system, each modified parameter needs to be verified under different working conditions, and the ring mold experiment and road test are expensive. Usually, only one round of experiments is carried out for one project. If the calibration process requires For parameter modification, it is difficult to guarantee the effect of new parameters on the tested working conditions. This algorithm is very unfriendly to suppliers with less experience

Images