Hybrid system classification
Hybrid vehicles are generally divided into three categories based on the hybrid drive linkage:
1. Series Hybrid Vehicles (SHEV) The HEV power system consists of three powertrains, including the engine, generator, and drive motor, in series.
2. The PHEV engine and generator are powertrains. The power of the two powertrains can be superimposed on each other and can be output separately.
3. The hybrid hybrid vehicle (PSHEV) integrates a series-type and parallel-type structure and consists of three major powertrains: an engine, an electric-generator and a drive motor.
According to the different degree of mixing in the hybrid system, the hybrid system can also be divided into the following four categories:
1. micro-hybrid system. The representative models are the PSA hybrid C3 and Toyota's hybrid Vitz. Strictly speaking, this micro-hybrid system car does not belong to a true hybrid car because its motor does not provide continuous driving power for the car.
2. light hybrid system. The representative model is a universal hybrid pickup truck. In addition to the ability to control the starting and stopping of the engine with a generator, the light hybrid system can also achieve:
(1) absorption of part of the energy under deceleration and braking conditions;
(2) constant engine speed during driving In operation, the energy generated by the engine can be adjusted between the drive demand of the wheels and the charge demand of the generator. The degree of mixing of light hybrid systems is generally below 20%.
3. hybrid system. Honda's hybrid Insight, Accord and Civic are all part of this system. The hybrid system uses a high-voltage motor. In addition, the hybrid system also adds a function: when the car is in an accelerated or heavy load condition, the motor can assist in driving the wheels, thereby supplementing the lack of power output of the engine itself, thereby better improving the performance of the vehicle. This system has a high degree of mixing, which can reach about 30%. The current technology is mature and widely used. 4 is a complete hybrid system. Toyota's Prius and future Estima are fully hybrid systems. The system uses a 272-650v high-voltage starter motor with a higher degree of mixing. Compared with the hybrid system, the full hybrid system can achieve a mixture of more than 50%. The development of technology will make full hybrid systems become the main development direction of hybrid technology.