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Second, hybrid vehicle classification
The hybrid vehicle uses two power sources as a power device. Its composition, layout method and control strategy are different, forming a variety of structured forms. Therefore, there are many classification methods for hybrid vehicles.
(1) Different charging methods are divided into plug -in hybrid vehicles and non -plug -in hybrid vehicles.
(2) According to the different types of fuel, it is divided into gasoline hybrid vehicles and diesel hybrid vehicles.
(3) Different connections driven by power -driven are divided into series, parallel and collateral (or mixed -connected) hybrid vehicles.
(4) According to the different degrees of hybrids in the hybrid system, it is divided into a hybrid vehicle of micro -miral power system, light hybrid system, medium hybrid system, and complete hybrid system.
3. Basic composition and working mode of hybrid vehicles
There are three basic working methods of hybrid vehicles, namely series, parallel, and skewers (or mixed). Its composition and working mode are as follows.
1. Series Hybrid Electric Vehicle (Shev)
(1) The main components of series hybrid vehicle power systems.
SHEV is composed of engines, generators, inverters, batteries, driving motors/generators and driving bridges. The basic structure composition of series hybrid vehicles is shown in Figure 2.1. The flow direction of the power energy during work is shown in Figure 2.2. The arrows in Figure 2.2 indicate the flow direction of mechanical energy and electrical energy when working when working. The two -way arrows indicate that energy can flow in both directions. Driving the car to drive, the kinetic energy of the car can also drive the generator to generate electricity.
 Candidate hybrid vehicle power system is basically composed of
Candidate hybrid vehicles are essentially an engine -assisted electric vehicle. As shown in Figure 2.2, when the car is driving, the mechanical energy of the engine output is first converted into electrical energy through the generator. Some of the transformed electrical energy is used to charge the battery, and the other part is driven by the motor and the transmission device to drive the wheel.
Candidate hybrid vehicle driver diagram
Candidate hybrid vehicles have flexible layout and simple transmission structure. There is no clutch between the mechanical connection between the engine and the generator, and it has certain flexibility. When designing SHEV, the selection of the drive device should be combined with the use of the vehicle. If the vehicle is often climbing and the power is required, the size of the three drivers of the engine, the generator and the motor will be large; For lower power, the overall size of the power system will be smaller. Candidate hybrid vehicles are more suitable for vehicles driving in urban areas, such as buses.
(2) Driver mode of series hybrid vehicles.
SHEV's drivers have the models such as starting, normal driving, acceleration, small load, deceleration, brake parking, etc., as shown in Figure 2.3.

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