A Method for Optimizing Vehicle Steering Performance via Semi-Active Suspension Damping Force Control

Abstract

A method for optimizing steering performance of a vehicle through semi-active suspension damping force control, relates to a method for controlling and optimizing steering performance of a vehicle. Establish the vehicle lateral motion dynamics equation including the vehicle yaw rate, lateral velocity and roll angle; give the expression describing the relationship between the front and rear axle load transfer amount, the lateral acceleration of the center of mass, and the suspension damping force when the vehicle turns; the vehicle The nonlinear relationship between the suspension damping force and the suspension current in the dynamic equation is represented by a piecewise linear model; the method of describing the dynamic performance index of the vehicle steering with the yaw rate, the lateral velocity of the center of mass and the roll angle is given; in different Under driving conditions, the vehicle steering dynamic performance optimization problem is obtained with the front and rear axle suspension drive currents as the optimization variables, and the yaw rate, center of mass lateral velocity, and roll angle as the optimization objectives; through optimization, the optimal front and rear axles are obtained. Suspension drive current, achieving the goal of controlling and optimizing vehicle steering performance.

Description

technical field [0001] The invention relates to a method for controlling and optimizing the steering performance of a vehicle, in particular to a method for optimizing the steering performance of a vehicle by controlling the damping force of a semi-active suspension, and belongs to the field of vehicle drive control. Background technique [0002] At present, semi-active suspension with adjustable damping has been widely used in high-end passenger cars, mainly used to adjust the comfort performance of the vehicle. The damping adjustment of the suspension not only suppresses the vertical vibration of the vehicle, but also brings about the change of the front and rear axle loads of the vehicle, which affects the yaw dynamic process of the vehicle. [0003] At present, the vehicle can control the yaw during the steering process by adjusting the torque difference between the inner and outer wheels or the hydraulic braking torque of the wheels. The adjustment range of the method ...

AI Technical Summary

Problems solved by technology

The adjustment range of the vehicle yaw control method through the wheel torque difference is limited by the road surface; the yaw control method through braking can only be applied in a short period of time because the hydraulic braking torque of the wheels cannot be continuously applied for a long time. dynamic torque, thus causing fluctuations in yaw rate and vehicle speed

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