PID + FF feedforward closed-loop control method based on electric compressor of pure electric vehicle

Abstract

The invention relates to a PID + FF feedforward closed-loop control method based on electric compressor of pure electric vehicle, When the air conditioning system enters normal mode, according to thetemperature error value and the position PID control sub-algorithm with integral deviation, the position PID control sub-algorithm with feedforward compensation and the look-up table PID control sub-algorithm respectively calculate the rotational speed of an electric compressor, Then the three speed values are summed up to get a total speed value. Finally, when the air conditioning system is turned on or off, the position PID controller with start / close protection is used to calculate the speed value of the electric compressor by using the total speed value to adjust the speed of the compressor. The method can accurately control the heating rotational speed of the electric compressor and achieve the control effect of "variable rotational speed and fixed temperature".

Description

technical field [0001] The invention relates to the technical field of pure electric vehicle air conditioning system control, in particular to a closed-loop control method based on PID+FF feedforward of an electric compressor of a pure electric vehicle. Background technique [0002] In the practical application of electric vehicles, it is inevitable to encounter problems such as battery pack overcooling in severe cold seasons and vehicle failures. Therefore, the electric compressor plays an extremely important role in the entire vehicle control, and it is related to the safety of the entire battery system operation. At the same time, the air conditioning system controls the temperature in the entire vehicle, so it is also related to the comfortable experience of the vehicle for users. [0003] At present, traditional cars generally use an open-loop algorithm to control the electric compressor. The open-loop control algorithm is accepted by most manufacturers because of its s...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a PID+FF feed-forward closed-loop control method based on the electric compressor of a pure electric vehicle, which automatically calculates the required speed of the electric compressor according to the current temperature difference through the PID, and corrects it in real time, and finally controls the electric compressor. The machine realizes the control purpose of "variable displacement and constant temperature", thereby solving the problems of energy waste, poor comfort and unstable air conditioning system existing in the existing PID open-loop control

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