Extended range electromobile power system using dual-clutch two-speed transmission

Abstract

The invention relates to an extended range electromobile power system using a dual-clutch two-speed transmission. The extended range electromobile power system is characterized in that a crank shaft of an internal combustion engine is connected with a shell of a first dual-clutch transmission gear; a first clutch of the first dual-clutch transmission gear is connected with a shell of a second dual-clutch transmission gear through a transmission shaft; the second clutch of the first dual-clutch transmission gear is connected with a first motor rotor; a second motor rotor is connected with a shell of the second dual-clutch transmission gear through a transmission shaft; and two sets of change gears are respectively controlled to output power by controlling the disengagement or engagement of two clutches of the second dual-clutch transmission gear to realize two gears. The vehicle is mainly driven by a second motor during low-speed driving, the low-speed and low-load operation of an engine is avoided, and the economical efficiency and emission of the whole vehicle are improved; during high-speed driving, the power system operates in parallel to drive the vehicle, the energy transmission efficiency is high, and the driving range of the vehicle is further extended on the basis of ensuring the dynamic property of the whole vehicle.

Description

technical field [0001] The invention relates to a range-extended electric vehicle power system adopting a dual-clutch two-speed transmission, in particular to a range-extended electric vehicle power system with an internal combustion engine and two electric motors capable of parallel driving of 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 sourc...

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) In the series extended-range electric vehicle, in the extended-range mode, there is a secondary conversion loss of energy, which affects the economy of the whole vehicle

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