Refrigerant flow distribution control method of automobile air conditioning system integrated with battery cooler

Abstract

The invention provides a refrigerant flow distribution control method of an automobile air conditioning system integrated with a battery cooler, and relates to the field of automobile air conditioners. The refrigerant flow distribution control method comprises the following steps: S1, calculating a first required refrigerant flow in a battery cooling flow path according to a water inlet temperature, a target water outlet temperature and a cooling water flow of a battery cooling loop, and calculating second required refrigerant flow in the flow path of an air conditioner evaporator according to sunlight intensity and environment temperature; S2, calculating flow path flow resistance after self-adaptive control of a thermostatic expansion valve according to the second required refrigerant flow, wherein according to the pressure balance principle, the flow resistance of the flow path is equal to the flow resistance of the battery cooling flow path under the first required refrigerant flow; and S3, calculating an electronic expansion valve step number, which is needed to be controlled, of the electronic expansion valve according to the flow resistance of the flow path, and adjusting the opening degree of the electronic expansion valve according to the electronic expansion valve step number. According to the invention, accurate distribution of refrigerant flow in the battery cooling flow path and the air conditioner evaporator flow path can be achieved, and the comfort of a cab is improved.

Description

technical field [0001] The invention relates to the field of automobile air-conditioning, in particular to a refrigerant flow distribution control method for an automobile air-conditioning system with an integrated battery cooler. Background technique [0002] At present, the cooling of electric vehicle battery packs generally adopts the method of water cooling, and the air conditioning system connects a battery cooler (which is essentially a plate evaporator) flow path in parallel with the evaporator flow path of the air conditioning box to provide cooling capacity for the battery cooling water path. Generally, the air-conditioning box evaporator flow path uses an electromagnetic cut-off normally open thermal expansion valve, the battery cooler flow path uses a normally closed electronic expansion valve, and other key components such as electric compressors and condensers share two flow paths. The key point of this technical solution is to control the flow of refrigerant in...

AI Technical Summary

Problems solved by technology

However, when the compressor speed has reached the maximum speed, the comfort of the cab will inevitably decrease.

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