Torque distribution method and torque distribution device for hybrid electric vehicle

Abstract

The invention provides a torque distribution method and a torque distribution device for a hybrid electric vehicle, and belongs to the technical field of vehicles. The technical problem of how to improve the working efficiency of an engine when an existing hybrid electric vehicle runs on an urban road is solved. The method comprises the steps: starting an engine according to the opening degree ofan accelerator pedal, making the engine work under a steady-state high-efficiency working condition, and executing the engine steady-state torque under the working condition; setting a parameter tableof the engine target torque: when the driver demand torque is less than or equal to the engine steady-state torque, using the engine basic torque as the engine steady-state torque, otherwise, using the engine basic torque as the driver demand torque; looking up the parameter table to obtain the engine target torque, taking the negative torque of the motor as the execution torque of the motor whenthe steady-state torque of the engine is kept, and enabling the motor to be in a power generation mode to enable the engine to keep working under steady-state and high-efficiency working conditions.The working efficiency of the engine during urban road driving is improved.

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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