Range extended electric vehicle power system adopting planetary gear two speed transmission

Abstract

The invention relates to a range extended electric vehicle power system adopting a planetary gear two speed transmission. The range extended electric vehicle power system adopting the planetary gear two speed transmission is characterized in that a crankshaft of an internal combustion engine is connected with a shell of a double clutch transmission device; a first clutch of the double clutch transmission device is connected with a planetary gear mechanism through a transmission shaft; a second clutch of the double clutch transmission device is connected with a rotor of a first motor; a rotor of a second motor is connected with any one component of a sun wheel, a planetary carrier and a gear ring of the planetary gear mechanism; power is output by the set second component of the sun wheel, the planetary carrier and the gear ring; and two gear shifts are realized by controlling the motion state of the set third component of the sun wheel, the planetary carrier and the gear ring. A vehicle is mainly driven by the second motor when running at low speed, so that low-speed and low-load work of an engine is avoided and the economy and the emission performance of the whole vehicle are improved. The vehicle is driven by the power system through parallel operation when running at high speed, so that the energy transfer efficiency is high and the driving range of the vehicle is further prolonged on the basis of guaranteeing the power performance of the whole vehicle.

Description

technical field [0001] The invention relates to a range-extended electric vehicle power system using a two-speed 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 powe...

AI Technical Summary

Problems solved by technology

Series extended-range electric vehicles have great advantages in terms of cost increase (compared with traditional vehicles), and the power performance is difficult to meet the vehicle performance requirements in the power maintenance stage, and the fuel economy at high speeds is also poor

The power and fuel consumption of hybrid extended-range electric vehicles are better than series extended-range electric vehicles in the power maintenance stage, but the power system is complex and the cost is high;

[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) For series extended-range electric vehicles, in the extended-range mode, there is a secondary conversion loss of energy that affects the economy of the vehicle

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