Dynamic Coordinated Control Method for Hybrid Electric Vehicle Working Mode Switching Process

Abstract

The invention discloses a hybrid electric vehicle working mode switching process dynamic coordination control method. Accelerator pedal depth is acquired by an EMS (engine management system) to obtain required vehicle torque, and an HCU (vehicle control unit) can select a work mode under a current working condition to work according to the required vehicle torque or the actual working condition; by controlling change rate from engine throttle percentage to target throttle percentage, the engaging speed of a clutch is reasonably controlled according to speed differences of an engine and a motor, insufficient dynamic output torque of the engine is offset by the quick response ability and the characteristic of accuracy torque control of the motor, and output torques of the motor and the engine are coordinated and allocated in the mode switching process. According to the technical scheme, the torque output of a hybrid power system is controlled, so as to reduce the dynamic process of the engine; oil consumption is reduced, so as to improve the economical efficiency; great fluctuation of the required vehicle torque is not generated in the mode switching process, so as to improve vehicle riding comfort; wear of the clutch is reduced, so as to ensure power transmission smoothness.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicle control, and in particular relates to a dynamic coordination control method in the process of switching working modes of the hybrid electric vehicle. Background technique [0002] A hybrid vehicle refers to a vehicle with a drive system composed of two or more power units, which combines the advantages of both the engine and the motor. It is a new type of vehicle with low emissions, good economy and long cruising range. [0003] The drive mode of hybrid electric vehicles mainly includes three modes: engine work, motor work, and engine and motor work together. Driving charging mode for charging the battery. It can be seen that the diversification of working modes is an effective means to realize energy saving and emission reduction of parallel hybrid power system. [0004] The control problem of working mode state switching is one of the core control problems of parallel hybrid el...

AI Technical Summary

Problems solved by technology

During the mode switching process, if the throttle opening of the engine is not effectively controlled, it will lead to poor power and smoothness of the vehicle during the switching process

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