Extended-range electric automobile power system adopting planetary transmission

Abstract

The invention relates to an extended-range electric automobile power system adopting a planetary transmission. The extended-range electric automobile power system adopting the planetary transmission is characterized in that a bent axle of a combustion engine is connected with a shell of a dual-clutch transmission gear; a first clutch of the dual-clutch transmission gear is connected with a planetary gear mechanism through a transmission shaft; a second clutch is connected with a first motor rotor; a second motor rotor can be connected with any one of the three elements such as a sun wheel, a planet carrier and a gear ring of the planetary gear mechanism, and a set second element outputs power; a movement state of a third element is controlled to achieve two gears; a second motor drives the vehicle when running at a low speed; low-speed and low-load work of the engine is avoided; economical efficiency and an emission performance of the entire vehicle are improved; the power system works in parallel to drive the vehicle when running at a high speed; energy transfer efficiency is high, a driving range of the vehicle is further extended on the basis of ensuring a dynamic performance of the entire vehicle.

Description

technical field [0001] The invention relates to a range-extended electric vehicle power system using a planetary gear transmission, in particular to a range-extended electric vehicle power system 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. ...

AI Technical Summary

Problems solved by technology

[0005] (1) Since the internal combustion engine of a traditional vehicle (or hybrid vehicle) needs to work in a low gear to meet the acceleration demand, its load rate is low and the load and speed change quickly, which affects the economy of the vehicle;

[0006] (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;

[0007] (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, and the internal combustion engine will always drive them Rotation, which will not only produce mechanical friction loss, but also electromagnetic loss, which will affect the economy of the vehicle;

[0008] (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;

[0009] (5) Series extended-range electric vehicles, in the extended-range mode, have energy secondary conversion losses and low fuel economy

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