Electric automobile thermal management system and control method and device thereof

Abstract

The invention discloses an electric automobile thermal management system and a control method and device thereof. The electric automobile thermal management system comprises a motor circuit, a batterycircuit, an air conditioner cooling circuit, a four-way valve and a controller. The control method comprises the steps of obtaining a cooling fluid temperature of the motor circuit as a first temperature by using a first temperature sensor; obtaining a cooling fluid temperature of the battery circuit as a second temperature by using a second temperature sensor; obtaining a temperature of a BMS inthe battery circuit as a third temperature by using a third temperature sensor; and when the controller detects that the motor circuit has a fault or the battery circuit has a fault, controlling thefour-way valve to communicate with the motor circuit and the battery circuit by using the controller according to the first temperature, the second temperature and the third temperature. According tothe electric automobile thermal management system and the control method and device thereof, when one circuit of the motor circuit and the battery circuit has the fault, the four-way valve communicates with the other circuit to work so as to protect the circuit of the thermal management system and prolong the service life of an automobile. The electric automobile thermal management system and thecontrol method and device thereof can be widely applied to the field of new energy automobiles.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to an electric vehicle thermal management system and a control method and device thereof. Background technique [0002] Compared with traditional vehicles, new energy vehicles do not include the engine and gearbox in the vehicle structure. As a result, the thermal management architecture of the vehicle has undergone tremendous changes, replaced by the thermal management of the electronic control system, motor and battery. During the driving process of new energy vehicles, the thermal management of the whole vehicle plays a huge role, which puts forward more stringent requirements on the heat dissipation capacity, heating capacity and energy consumption of the motor circuit and battery circuit. [0003] During the use of the vehicle, when the liquid pump (such as water pump, etc.) in the thermal management control circuit fails to work, the vehicle will not be able to dissipate he...

AI Technical Summary

Problems solved by technology

[0003] During the use of the vehicle, when the liquid pump (such as water pump, etc.) in the thermal management control circuit fails to work, the vehicle will not be able to dissipate heat, and each component will have the risk of overheating, which will seriously affect the use of the vehicle and cause vehicle performance restricted

In severe cases, serious phenomena such as motor overheating and battery overheating may even occur, causing damage to control components and shortening the service life of the vehicle

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