Single-motor multi-mode coupling power transmission system of hybrid electric vehicle

The invention relates to a single-motor multi-mode coupling power transmission system of a hybrid electric vehicle, belonging to the technical field of powertrain components of new energy vehicles. The system comprises an engine, a motor, two sets of planetary gear mechanisms, two clutches, two brakes, a plurality of gears and transmission shafts, a main reducing gear, a differential assembly andthe like. By controlling whether the two clutches and the two brakes are engaged or not, the coupling mode of the motor and the engine is changed, the speed coupling of the motor and the engine and the torque coupling of the motor and the engine are realized, the acceleration performance of the system is improved, the problems of low load and low efficiency of the engine are solved, and the loss of path conversion efficiency of the system is reduced. 本发明涉及种单电机混合动力汽车多模耦合动力传动系统，属于新能源汽车动力总成部件技术领域，包括发动机、电机、两套行星齿轮机构、两个离合器、两个制动器、若干齿轮及传动轴、主减速器及差速器总成等。本发明通过控制两个离合器和两个制动器的接合与否改变电机与发动机的耦合方式，来实现电机与发动机转速耦合、电机与发动机转矩耦合，提高了该系统的加速性能，解