基于修正模糊控制器的半主动悬架仿真研究

Simulation Research on Semi-active Suspension Based on Fuzzy Controller with Correction Factor

通过MATLAB软件建立基于二自由度半主动悬架动力学仿真模型,计算簧载质量速度及其变化率作为主动悬架控制的输入量。半主动悬架采用带修正因子模糊控制器,用加权系数分别控制簧载质量速度与加速度所占模糊控制器输入的比重,其中加权系数采用簧载质量速度进行修正调节。计算结果表明:采用带修正因子模糊控制器在各不同车速阶段对改善悬架的总体性能有明显作用,车身垂直加速度、悬架动行程、俯轮胎动行程在低速阶段改善突出,性能分别提升33.8%、20.0%、7.5%。

Two degrees of freedom semi-active suspension dynamic simulation model is established using MATLAB software, the sprung mass velocity and its change rate are calculated as the input of active suspension control; semi-active suspension adopts fuzzy controller with correction factor, the weighting coefficient is used to control the proportion of the sprung mass velocity and acceleration in input of fuzzy controller, wherein the weight coefficient is adjusted by the sprung mass velocity. The results show that the fuzzy controller with correction factor has obvious effect on improving the overall performance of the suspension at different vehicle speeds, while body vertical acceleration, suspension dynamic travel, and the tire dynamic stroke are improved obviously in the low speed stage, with the performance respectively improved by 33.8 %, 20.0%, 7.5%.