A torque distribution method and torque distribution device for a hybrid vehicle

Abstract

The invention provides a torque distribution method and a torque distribution device for a hybrid vehicle, belonging to the technical field of automobiles. It solves the technical problem of how to improve the working efficiency of the engine when the existing hybrid vehicle is driven on the city road. The method includes: starting the engine according to the accelerator pedal opening, making the engine work in a steady-state high-efficiency working condition, and executing the engine steady-state torque under the working condition; setting a parameter table of the engine target torque: when the driver requests the torque When it is less than or equal to the engine steady state torque, the engine base torque is the engine steady state torque, otherwise, the engine base torque is the driver's demand torque; look up the parameter table to get the engine target torque, and keep the engine steady state torque as the negative torque of the motor. The execution torque of the motor keeps the motor in the power generation mode to keep the engine working in a steady-state high-efficiency condition. The invention improves the working efficiency of the engine when driving on urban roads.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicles, and in particular relates to a torque distribution method and a torque distribution device for hybrid electric vehicles. Background technique [0002] In a hybrid electric vehicle, the engine and the motor are generally used as a hybrid drive, and its energy management method is the core technology of a hybrid electric vehicle, and is the key to achieving vehicle fuel economy and cleanliness and environmental protection. [0003] Through a large number of actual road tests, the engine demand torque is not very large for the comfortable driving style in urban working conditions. The fluctuation of the driver's accelerator pedal is very complicated and changes all the time. In traditional hybrid vehicles, the engine target torque is closely related to the driver's accelerator pedal opening. When the accelerator pedal is stepped on, the engine will instantly transition from 0 torqu...

AI Technical Summary

Problems solved by technology

This kind of plug-in hybrid electric vehicle, especially when the SOC of the power battery is low, cannot run purely electric. It needs the engine to provide driving torque and battery charging torque, and the engine has a slow response speed, and it frequently accelerates when it is used in urban conditions. The pedal will cause the engine torque to fluctuate sharply, the efficiency will be poor, and the vehicle dynamic response will also slow down

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