Power split type hybrid electric vehicle driving system and control method thereof

Abstract

A power split type hybrid electric vehicle driving system comprises an engine and wheels, and further comprises a first motor, a second motor, a first clutch, a second clutch, a first epicyclic gear train, a second epicyclic gear train, a third epicyclic gear train, a first brake and a second brake. A power split type hybrid power topological mechanism is adopted, the power of an internal combustion engine is distributed on two paths, one path is a mechanical path, acting force can be directly transmitted to the wheels through gear engagement, the other path is an electric path, and besides the internal combustion engine and a driving device, an electric motor can apply the acting force to planetary gears. An engine rotating speed and a vehicle speed are decoupled, a working rotating speedrange of the engine is adjusted in real time through the generator, an engine output torque, the wheel rotating speed, a required wheel torque and other driving requirements are adjusted through thedriving motor, a working point of the internal combustion engine is more ideal, and whole vehicle fuel economy is improved to the maximum degree. Automatic gear shifting is achieved, power is ensurednot to be interrupted in the gear shifting process, and driving stability is guaranteed.

Description

technical field [0001] The invention belongs to the field of hybrid power system development, and in particular relates to a power split type hybrid power vehicle drive system and its control method. Background technique [0002] A hybrid vehicle refers to the use of a traditional internal combustion engine (gasoline engine or oil extraction engine) and an electric motor as a power source, and the electric motor is supplied by a power battery or generated by internal fuel. Through the combination of internal combustion engine and electric motor, the fast response characteristics of the electric motor are applied to adjust the operating point of the engine and control the engine to work in a relatively economical range to improve economy and reduce emissions. [0003] Some of the existing hybrid electric vehicles are series hybrid systems, which are characterized by the fact that the engine is not directly involved in the drive, the engine is only responsible for generating e...

AI Technical Summary

Problems solved by technology

The advantage of this drive system is that conventional drive systems can be retained to a wide extent, which not only benefits installation space and vehicle construction, but also has a positive effect on customary driving characteristics and customer acceptance; the disadvantage of this arrangement is that Since the speeds of the two units are fixed via the transmission ratio and the driving speed, the direct connection of the electric motor to the internal combustion engine has an effect on the free selection of the operating point, and when using a multi-speed transmission, there is no continuous free selection via the electric motor and the internal combustion engine Resulting drive system and rotational speed

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