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Hybrid Electric Vehicle (HEV) refers The difference is the power transmission system. The traditional automobile power transmission system is mainly composed of engines, clutches, transmissions, divisioners, transmission shafts, differentials, and driving shafts, schematic diagram of the traditional four -wheel drive car power transmission system. The power source of traditional cars is a piston internal combustion engine. It has the characteristics of high speed, small output torque changing range, cannot reverse, and difficult to start with load. The speed and driving force requirement of the car is large, and it can move backwards, start and stop steadily. The transmission system is set up to solve this contradiction. It can ensure that the car works normally under different conditions and obtain better power performance.
Traditional car transmission system
1 -engine 2 -front -drive bridge 3 -transmission 4 — clutch 5 — Central differential 6 -rear drive bridge
Hybrid vehicles carry different power sources. As the road conditions change and according to the requirements of driving, they can use different power sources to drive the car at the same time or separately. To this end, the structure of hybrid vehicles and traditional car transmission systems is different. It is necessary to add two power to the power transfer system to overlap two power together or decompose one power into two power.
The device with power connection or switching is called a power coupling device. Power coupling can be a mechanical structure or electromagnetic structure, or a mechanical and electromagnetic composite structure. The coupler is one of the obvious features of hybrid vehicles.Schematic diagram of the electromagnetic coupling structure series series of hybrid vehicle power transmission system a schematic diagram of a mechanical coupling mixed -power mixed -power vehicle power transmission system. For different types of hybrid electric vehicles, the power source layout and the transmission system structure are different depending on the contribution of the two power source to the power output of the vehicle.

Electromagnetic coupling series connected hybrid transmission structure
1 -engine 2 -generator 3 -electric 4 -transmission 5 -power controller
Mechanical coupling hybrid transmission structure
1 -engine 2 -automatic transmission 3 -power generation/electric all -in -one motor
1. Candidate hybrid power driver system
The series of hybrid dynamic driving systems are powered by two energy sources to a single power device to promote the driving system of vehicle driving. The composition of the general series hybrid power driving system is shown The combination of the engine and the generator constitutes a one -way energy converter. The output of the generator can be connected to the power bus through the controllable electron transformer. The two -way energy is the battery pack unit and is connected to the power bus through the controllable bidirectional electronics converter. The power bus is connected to the controller of the motor to drive the motor to be controlled by the motor controller, or the motor function, and operates positively or reverse; or converts to the power of the generator to convert the inertial energy of the vehicle to electrical energy. The series of hybrid dynamic driving systems changed from pure electric vehicles. Because pure electric vehicles are subject to the low energy density of the battery pack, in order to increase the mileage of electric vehicles, auxiliary engines and generator sets are added to electric vehicles.

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