基于模糊滑模backstepping的半主动空气悬架设计

为了研究半主动空气悬架系统对车辆行驶性能的影响,提出基于半主动空气悬架的模糊滑模backstepping控制。建立1/4二自由度半主动空气悬架动力学模型,用模糊逻辑系统逼近未知函数,解决了阻尼系数不易测的问题。该方法设计的控制器能够适应因车辆行驶状态或者环境发生改变而引起的系统参数在一定范围内的变化。仿真结果表明,与被动悬架相比,模糊滑模backstepping控制器对于提高半主动空气悬架系统减振效果更加明显。

Design of Semi-active Air Suspension Systems Based on Fuzzy Sliding Mode Back-stepping

In order to study the influence of semi - active air suspension system on vehicle running performance, a fuzzy sliding mode backstepping control based on semi-active air suspension is proposed. Firstly, a quarter-car model for semi-active air suspension system is established. Then, the fuzzy logic systems are employed to approximate the unknown function and the problem that damping coefficient is not easy to measure is solved. The controller designed in this paper can adapt to the change of the system parameters caused by the change of the vehicle running state or the environment within a certain range. The results show that, compared with passive suspension, the proposed fuzzy sliding mode backstepping controller in this paper is more effective in improving the vibration reduction effect of the semi- active air suspension system.