Thermal management system control method and device

Abstract

The thermal management system control method comprises the steps that when it is detected that a battery of an electric vehicle needs to be cooled, a water pump of a battery cooling loop is controlled not to operate, and an electromagnetic valve of a thermal management system is started, so that a refrigerant of an air conditioning system flows through a heat exchanger to conduct heat exchange with battery cooling liquid in the battery cooling loop; after a preset first time period, the electromagnetic valve is closed, so that the refrigerant completely flows through the air conditioner loop, and the water pump is controlled to start to operate, so that the battery cooling liquid in the heat exchanger flows in the battery cooling loop to cool the battery cooling liquid in the battery cooling loop; opening the electromagnetic valve after a preset second time period, and controlling the water pump to stop running; when the temperature of the battery cooling liquid in the battery cooling loop reaches the preset reasonable range, the electromagnetic valve and the water pump are started at the same time to conduct battery cooling control, the temperature impact on an air conditioning system of a passenger compartment can be reduced during battery cooling, high-frequency opening and closing noise of the valve can be avoided, and the NVH performance of the whole vehicle is guaranteed.

Description

technical field [0001] The present application relates to the technical field of automobiles, in particular, to a method and device for controlling a thermal management system. Background technique [0002] At present, electric vehicles, as new energy vehicles, have received widespread attention from all walks of life. During the operation of electric vehicles, the temperature of the battery cells will be maintained within a certain temperature range through the cooling system of the vehicle, so that the batteries can be charged and discharged more normally. . In the existing electric vehicles, the control method of the thermal management system is usually coupled with the passenger compartment air conditioning system through a heat exchanger. swap, thereby cooling the battery. However, in practice, it has been found that the existing method will cause sudden changes in the temperature of the air-conditioning outlet in the passenger compartment, causing discomfort to the d...

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Problems solved by technology

However, in practice, it is found that the existing method will cause the temperature mutation of the air conditioner outlet in the passenger compartment, which will cause discomfort to the driver and passengers. At the same time, it is also prone to high-frequency opening and closing noise of the valve, which will affect the NVH performance of the vehicle.

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