基于反演滑模控制的空气悬架车身高度控制策略研究

Research on Air Suspension Control Strategy Based on Backstepping Sliding Mode Control

为提高汽车行驶的平顺性,对电控空气悬架的控制策略进行研究。针对电控空气悬架充放气非线性的特点,建立其管路流量模型、空气弹簧压力模型及动力学模型。为消除车身高度调节中产生的超调振荡,使车身高度能够稳定调节,提出反演滑模的控制方法。仿真结果表明,该控制策略能克服非线性特性,快速稳定地调节车身高度,并抑制充放气过程中的过充与过放现象。

In order to improve the ride comfort of the vehicle,the control strategy of the electronic control air suspension is studied.Aiming at the characteristics of charge and discharge nonlinearity of electronically controlled air suspension,the pipeline flow model,air spring pressure model and dynamic model are established.In order to eliminate the overshoot oscillation generated in the height adjustment of the body,the height of the vehicle body can be adjusted steadily,and the control method of the inversion sliding mode is put forward.The simulation results show that the control strategy can overcome the nonlinear characteristics,adjust the height of the vehicle quickly and steadily,and suppress the overcharge and over discharge in the process of charge and discharge.