Range extended electric vehicle power system

Abstract

The invention relates to a range extended electric vehicle power system, which mainly comprises an internal combustion engine, a first motor, a second motor, a double clutch transmission device and a set of change gear mechanism, wherein a crank shaft of the internal combustion engine 1 is connected with a shell 2 of the double clutch transmission device; a first clutch 3 of the double clutch transmission device is connected with a first transmission gear 11 through a transmission shaft 13; a second clutch 4 of the double clutch transmission device is connected with a rotor 7 of the first motor; and a rotor 10 of the second motor is connected with a second transmission gear 8. The series operation mode and the parallel operation mode of the range extended electric vehicle power system can be switched by controlling the combination or separation of the first clutch 3 and the second clutch 4 of the double clutch transmission device. The first transmission gear and the second transmission gear form the change gear mechanism, so that the output torque of the second motor can be increased.

Description

technical field [0001] The invention relates to an extended-range electric vehicle, in particular to a power system for an extended-range electric vehicle which has an internal combustion engine and two electric motors and can be driven in parallel by the internal combustion engine and the electric motors. Background technique [0002] Today, when energy conservation and environmental protection have become the development theme of the automobile industry, hybrid electric vehicles have become the focus of research by automobile manufacturers in various countries. Hybrid Electrical Vehicle (HEV) refers to a vehicle that is equipped with two power sources at the same time—heat power source (generated by a traditional gasoline engine or diesel engine) and electric power source (power battery and electric motor). Hybrid electric vehicles do not require external charging, and are electric vehicles with the engine as the main power source. Through hybrid functions such as engine i...

AI Technical Summary

Problems solved by technology

[0006] Satisfy the acceleration demand, its load rate is low and the load and speed change quickly, which affects the economy of the whole vehicle;

[0007] (2) In the existing hybrid configuration, the motor is mainly used to adjust the working area of ​​the internal combustion engine, so that the internal combustion engine can work in the optimal economic range as much as possible. The power required to drive the vehicle is still mainly provided by the internal combustion engine, so the power of the internal combustion engine is very low. Large, affecting vehicle economy and emissions;

[0008] (3) In the existing hybrid configuration, there are generally two forms of the first electric motor, BSG (Belt Starter Generator) and ISG (Integrated Starter Generator), which are usually directly connected to the internal combustion engine, which will always drive them when the internal combustion engine is working Rotation, which will not only produce mechanical friction loss, but also electromagnetic loss, which will affect the economy of the vehicle;

[0009] (4) Although pure electric vehicles can achieve zero fuel consumption and zero emissions, due to the limitations of the volume and energy density of power batteries, their driving range is very limited;

[0010] (5) Series extended-range electric vehicles, in the extended-range mode, have energy secondary conversion losses and low fuel economy

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