Single-motor hybrid electric vehicle multi-mode coupling powertrain

Abstract

The invention belongs to the technical field of power assembly parts of new energy vehicles and relates to a multimode coupling power transmission system for a single-motor hybrid electric vehicle. The system comprises an engine, a planetary gear mechanism, a first gear, a brake, a second clutch, a second gear, a first clutch, a third gear, an inverter, a power battery, a motor, a third clutch, afourth gear, a fifth gear, a transmission, a main speed reducer and a differential assembly. By control of connection between the three clutches and the brake, coupling modes of the motor and the engine and the position of the motor relative to the transmission can be changed, motor and engine rotating speed coupling, motor and engine P2 parallel torque coupling and motor and engine P3 parallel torque coupling are realized, and accordingly acceleration performance of the system is improved, the problem of low load and low efficiency of the engine is solved, and system path changing efficiencyloss is reduced.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicle power assembly components, and relates to a driving and braking device of an electric-hydraulic hybrid power system, in particular to a multi-mode coupling power transmission system of a single-motor hybrid power vehicle. Background technique [0002] With its advantages of low consumption and low pollution, new energy vehicles have become an important direction of automobile development. Among them, pure electric vehicles cannot be widely used due to their short cruising range on a single charge and high vehicle manufacturing costs. Although hybrid vehicles are still mainly powered by fuel, compared with traditional fuel vehicles, the energy utilization rate has been significantly improved, and pollution emissions have been significantly reduced. Mainstream automakers have carried out research and development and manufacturing of hybrid vehicles. [0003] At present, in the hybrid pow...

AI Technical Summary

Problems solved by technology

The scheme has a simple layout and can easily realize pure electric drive mode and parallel hybrid drive mode. However, when the system is under low load, the working range of the engine cannot be adjusted through motor speed regulation, which makes the engine inefficient and affects the economic performance of the entire system.

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