[汽车维修知识]The working principle of hybrid electric vehicles

Hybrid electriccarThe power system is mainly composed of control system, drive system, auxiliary power system and battery pack.
Take a series hybrid electric vehicle as an example, and introduce the working principle of a hybrid electric vehicle.
At the beginning of the vehicle,AccumulatorIn a state of full power, its energy output can meet the requirements of the vehicle, and the auxiliary power system does not need to work;
When the battery power is less than 60%, the auxiliary power system starts:
When the vehicle energy demand is large, the auxiliary power system and the battery pack provide energy for the drive system at the same time;
When the vehicle energy demand is small, the auxiliary power system provides energy for the drive system while also charging the battery pack.
Due to the existence of the battery pack, the engine works in a relatively stable working condition and its emissions are improved.

Vehicle energy control system
The energy management system adopts hierarchical control: the top layer is the vehicle energy management system, which uniformly coordinates and controls each low-end controller; the middle layer includes five low-end controllers, namely engine controllers,DynamoController, motor controller,clutchandBrakeController and battery energy management system (BMS), etc.; the bottom layer is the various actuators, namely the engine, motor, clutch and other components.

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