Integrated control method and system for semi-active suspension system of whole vehicle

Abstract

The invention provides an integrated control method and system for a semi-active suspension system of the whole vehicle. The method comprises the steps that lateral control vehicle parameters, longitudinal control vehicle parameters and the current vehicle speed are obtained; a threshold interval of vehicle parameters required for control is determined, a damping gradient interval corresponding to each control parameter is determined according to each threshold interval and damping gradient interval mapping data table, and a vehicle speed threshold corresponding to each damping gradient interval is acquired; if the current vehicle speed is greater than the threshold value, lateral and longitudinal control damping target values are obtained according to the vehicle speed and a damping mapping table; the damping target value with the larger numerical value is used as a side longitudinal control damping target value; and according to the obtained vertical control damping target value, the damping proportion value determined according to the road condition and the side longitudinal control damping target value, the damping target value of each shock absorber is calculated and output. The technical problems that in the prior art, the comfort is improved, meanwhile, the wheel grounding performance is reduced, and the whole vehicle operation stability cannot be considered in real time at the same time are solved.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to an integrated control method and system for a semi-active suspension system of a whole vehicle. Background technique [0002] The semi-active suspension control methods for adjustable damping in the prior art are all based on the skyhook control theory in engineering, which is only for 1 / 4 vehicles. The grounding of the unsprung mass wheels is compromised, thus sacrificing the driving safety of the vehicle to a certain extent. Even though various derivative control methods based on ceiling control, such as "ceiling-floor control", take into account the control of unsprung mass to a certain extent, the grounding performance will not deteriorate too much, but they cannot control the side of the vehicle from the vehicle level. The lateral (rolling) motion and longitudinal (pitching) motion are controlled, so as to take into account the handling stability of the vehicle in real time. And va...

AI Technical Summary

Problems solved by technology

[0003] Based on the above problems, the present invention proposes an integrated control method and system for the semi-active suspension system of the whole vehicle. Taking into account the technical problems of vehicle handling stability such as lateral motion and longitudinal motion, it also solves the high computational requirements of these algorithms on the controller, which actually brings a large response time lag, and the control parameters have no specific physical meaning. Technical issues that are not operable in engineering applications

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