Control method of heat pump air conditioning system for automobile

Abstract

The invention discloses a control method of a heat pump air conditioning system for an automobile. According to the control method, action time of all electromagnetic valves is alternated, the risk of noise superposition caused by simultaneous action of the plurality of electromagnetic valves is avoided; the front-back pressure difference of the electromagnetic valves is enabled to be smaller than valve opening pressure value when the electromagnetic valves are opened and actuated, so that the risk that pneumatic noise is generated when the valves are opened in the case of large front-back pressure difference is avoided, and valve opening noise of the electromagnetic valves is reduced; action time of starting, rotating speed reduction, stopping and rotating speed recovery of a compressor is alternated with the action time of the electromagnetic valves, and operation noise of the compressor is reduced; the action frequency of each electromagnetic valve and the action frequency of an electronic expansion valve are reduced, and action noise of the electromagnetic valves and action noise of the electronic expansion valve are reduced; and under the working condition where noise of the compressor is easily identified, the rotating speed is reduced to low speed or medium speed, and the operation noise of the compressor is reduced. According to the control method, NVH performance of the heat pump air conditioning system for the automobile is effectively improved, so that the NVH performance of the whole automobile is further improved.

Description

technical field [0001] The invention relates to the technical field of an automobile heat pump air-conditioning system, in particular to a control method for an automobile heat pump air-conditioning system. Background technique [0002] At present, users' requirements for vehicle NVH (Noise, Vibration, Harshness) performance are constantly increasing. [0003] For fuel vehicles, the NVH performance of the engine has a greater impact on the NVH performance of the vehicle, so the NVH performance of the vehicle is mainly improved by improving the engine performance. [0004] For electric vehicles, the air-conditioning system mostly adopts heat pump air-conditioning system, please refer to Figure 1-Figure 5 , figure 1 A schematic diagram of a typical heat pump air conditioning system adopted for electric vehicles; figure 2 for figure 1 The schematic diagram of the medium flow path of the heat pump air-conditioning system shown in the cooling mode; image 3 for figure 1...

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Problems solved by technology

[0012] Therefore, the NVH performance of the whole vehicle can be improved by improving the performance of the heat pump air conditioning system. In the prior art, how to improve the performance of the heat pump air conditioning system To improve the NVH performance of the vehicle, no effective means have been proposed

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