车辆半主动悬架新型控制算法的研究

车辆1/4悬架模型不能反映车辆的俯仰情况,且一般控制算法多以簧载质量加速度作为反馈,具有一定的局限性。为更好地改善悬架性能,本文建立了车辆1/2半主动悬架4自由度模型,针对悬架为一非线性、有时滞、不确定系统,提出了一种新型控制算法(在模糊控制的基础上引入PID控制),且在MATLAB中分别进行了时域和频域仿真,并就簧载质量加速度、悬架动挠度、轮胎动载荷与被动悬架、模糊控制半主动悬架进行比较。结果表明,该算法对簧载质量加速度、悬架动挠度、轮胎动载荷的改善非常有效,对车辆悬架的控制和开发具有较大的参考价值。

Research on New Control Algorithm for Semiactive Suspension Model of Vehicle

The quarter vehicle model can not reflect the pitching movement.Moreover,the normal control algorithm generally uses the acceleration of sprung mass as the feedback,so it has some limits.In order to improve the suspension(performance) greatly,the model of vehicle's semi-active suspension with four dimensional freedom is built.Considering that the suspension is a nonlinear system with uncertainties of itself and having time lag,a new control algorithm is advanced(based on fuzzy control the PID control is introduced),the simulations on the time domain and frequency domain are carried out in the MATLAB,and the comparisons with passive suspension and semi-active suspension with fuzzy control on the(acceleration) of sprung mass,the tyre travel and the tyre dynamic force are taken.The results indicate that the new control(algorithm) is very effective for the improvement of the acceleration of sprung mass,the tyre travel and the tyre dynamic force,which will present some references for the control and development of vehicle suspension.