Layered control method of hybrid electric vehicle traction

Abstract

The invention relates to a layered control method of hybrid electric vehicle traction, comprising the following steps of: (1) arranging an upper expected-drive total-moment calculating layer, a middle dynamic coordination control layer and a bottom escape mechanism layer; (2) according to driver operation input, obtaining an expected engine torque and an expected motor torque; (3) inputting the expected engine torque, the expected motor torque, the wheel speed of a driving wheel and an objective slippage rate into the upper expected-drive total-moment calculating layer to calculate the expected drive total moment of a whole vehicle driving system; (4) inputting an actual drive total moment, the expected drive total moment of the whole vehicle driving system and the expected motor torque into the middle dynamic coordination control layer to calculate the objective torques of an engine and a motor; and (5) inputting the objective torques of the engine and the motor, the expected engine and motor torques and all the driving wheel slippage rate into the bottom escape mechanism layer to establish an exit strategy of the dynamic-compensation hybrid electric vehicle traction layered control system and calculate engine torque commands and motor torque commands. The invention can be widely applied to a traction control system of various hybrid electric vehicles.

Description

technical field [0001] The invention relates to a method for controlling traction force of a vehicle, in particular to a method for layered control of traction force of a hybrid electric vehicle. Background technique [0002] The traction control system of the car can effectively suppress the violent slippage of the driving wheel by adjusting the engine torque and applying the braking force on the driving wheel, so as to improve the starting performance, acceleration performance and driving stability of the vehicle, which has a great impact on the driving safety of the vehicle. is of great significance. [0003] Most of the existing traction control systems are researched on traditional internal combustion engine vehicles. When the road surface is uniform, the control mode combining engine torque control and brake intervention is mainly adopted. The introduction of brake intervention is to make up for the shortcomings of slow engine response, but it also causes a series of...

AI Technical Summary

Problems solved by technology

There are also some literatures that use the joint control method of the engine and motor, but the control methods are too simple, and the control of the engine still stays on the throttle control technology with shortcomings such as slow response speed and large control deviation.

Images