Series-parallel hybrid power automobile powertrain system and power distribution control method thereof

Abstract

The invention discloses a series-parallel hybrid power automobile powertrain system and a power distribution control method of the series-parallel hybrid power automobile powertrain system. The powertrain system comprises an engine, an automobile integrated starter generator (ISG), a planetary gear train, a driving motor, a power battery pack, an engine clutch, an ISG brake, a planetary gear train clutch and a driving motor clutch, wherein the engine clutch, the ISG brake, the planetary gear train clutch and the driving motor clutch are controlled by a vehicle control unit. The ISG is directly integrated on a sun gear of the planetary gear train and is provided with a continuously variable transmission (CVT) and a CVT brake. By the adoption of an electric driving priority control strategy, the operation point of the engine is regulated by fully utilizing the operating characteristics of the CVT, so more automobile patterns can be selected on complex and different working conditions; besides, the driving motor and the ISG are used for coordinating operation of the engine, so that the engine operates on an optimal curve most of time; since the power performance of an automobile is optimized by coupling the rotating speed and torque, the running efficiency of the engine and the fuel economy of the whole automobile are improved remarkably, emission is reduced, and remarkable energy conservation and emission reduction effects are achieved.

Description

technical field [0001] The invention belongs to the hybrid electric vehicle control technology, in particular to a hybrid hybrid electric vehicle power assembly system and a power distribution control method thereof. Background technique [0002] A hybrid hybrid vehicle with a driving system composed of at least two power devices combines the advantages of a series hybrid electric drive system and a parallel hybrid electric drive system, which can not only realize the output power of the engine to the driving wheels, but also can output power according to the The speed coupling mode or torque coupling mode needs to be selected according to the driving conditions, so as to free the engine torque and speed from being bound by the load torque and vehicle speed of the car, so that the engine runs on the optimal efficiency curve most of the time, and has a greater The flexibility of energy flow control can better realize energy saving and emission reduction. However, the motors ...

AI Technical Summary

Problems solved by technology

However, the motors of most existing hybrid electric vehicles are driven by auxiliary engines, and the power provided during operation only accounts for 30% of the total power demanded by the vehicle. Compared with traditional internal combustion engine vehicles, there is a gap in its fuel economy and cannot Internal combustion engine vehicle competition is not conducive to the development of hybrid vehicles

[0003] The continuously variable transmission (Continuously Variable Transmission, abbreviated as CVT) has a continuously variable transmission ratio and continuous power output, which can realize the best match between the transmission system and the engine working conditions, so that the engine can work in the high-efficiency zone, which has not been seen so far. Hybrid electric vehicle powertrain with CVT

Images