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Electric vehicle investment join analysis power drive type
- Aug 22, 2018 -

Through the analysis of the electric vehicle franchisees, we know that the energy generated by different drive types is also different, and the energy saving effect achieved is different.

First, plug-in type. The electric vehicle system charges the power battery provided in the system by connecting to the household power source, and can be driven in the pure electric mode only by the energy of the power battery after charging. This hybrid system has a longer pure electric range than a full hybrid system. The power ratio of the system is basically the same as that of the pure electric system (or slightly smaller). The power ratio of the internal combustion engine is basically the same as that of the full hybrid system. The battery capacity is generally larger than that of the full hybrid system and smaller than that of the pure electric vehicle system. Because the plug-in hybrid system can use the electricity of the grid as the energy source of the electric vehicle, it greatly reduces the dependence on oil and has good environmental benefits. It is considered to be an important development direction of the hybrid drive system.

Second, full mixing, also known as deep hybrid power system. It refers to a drive system that can use either a gasoline internal combustion engine or an electric motor to drive the vehicle alone or both. They generally use large-capacity batteries to supply the motor to operate in pure electric mode, and also have power switching devices for coupling and separating the engine and motor power. In the conditions of starting, reversing, slow acceleration (such as frequent start-stop), low-speed driving, the vehicle can drive in pure electric mode; when accelerating, the motor and the internal combustion engine drive the vehicle together, and have the function of braking energy recovery. Compared with the medium hybrid system, the ratio of the power of the battery to the motor is larger in the two power sources that drive the vehicle, and the ratio of the power of the internal combustion engine is smaller. This hybrid system can achieve 30%-40% fuel economy.

Third, light mixing. Also known as "Stop-Start Mixing", in a light hybrid system, the motor is only used as a starter/generator for the internal combustion engine. The starter/generator system that is commonly used now refers to a belt drive starter motor (referred to as BSG) on a starter motor (generally 12V, also 24V) of a conventional internal combustion engine. The motor power is only 3-6kW, which is used to control the starting and stopping of the engine. If the vehicle needs to stop for a short time in case of red light or traffic jam, the engine will be turned off to cancel the idle speed, and when the vehicle runs again, it will restart immediately. The engine, which reduces fuel consumption and emissions, and turns into a generator when the car brakes, achieving brake energy recovery. The BSG system has a simple structure and light weight, has little change to the original structure of the vehicle, and has low cost, and can achieve a fuel saving effect of 5%-10%. But in a strict sense, a car with a light hybrid system is not a true hybrid system because its motor does not provide continuous power for the car.

Fourth, mixed. Also known as auxiliary drive mixing, compared with light mixing, the ratio of battery and motor power is increased in the two power sources of the medium hybrid drive system, and the ratio of the power of the internal combustion engine is relatively reduced. Typically, such hybrid drive systems employ an integrated starter motor, referred to as ISG. The vehicle is still powered by the engine, and the assisted motor is installed between the engine and the transmission as an auxiliary power source connected to the main power. It is used as an electric motor when more driving force is required during driving. It is used as a starter when it is necessary to restart the engine that is turned off. It also enables partial energy recovery under deceleration and braking conditions. During driving, the engine is running at equal speed, and the energy generated by the engine can be adjusted between the driving demand of the wheel and the charging demand of the generator. The medium-mixing system is simple, compact and light in weight, which can greatly improve fuel economy, reduce emissions, and achieve fuel economy of 10%-15%.

The hybrid drive system of electric vehicles is mainly divided into the above-mentioned types, and everyone can refer to it briefly for reference.