HEV (Hybrid-Electric Vehicle)—hybrid power plant. Hybrid power refers to the use of gasoline-driven and electric-driven driving methods for cars. The advantage is that when the vehicle starts and stops, it is only driven by the motor, and the engine will not work unless it reaches a certain speed. Therefore, the engine can always be kept in the best working condition. It has good power, low emissions, and the source of electrical energy is the engine, which only needs to be refueled.
The key to a hybrid vehicle is the hybrid power system, and its performance is directly related to the performance of the hybrid vehicle. After more than ten years of development, the hybrid powertrain assembly has evolved from the original discrete structure of engine and motor to an integrated structure of engine motor and gearbox, that is, an integrated hybrid powertrain system. Hybrid powertrains are classified by power transmission routes, and can be divided into three types: series, parallel, and hybrid.