重载车辆半主动悬架控制策略研究

Study of Control Strategy of Semi-Active Suspension System for Heavily Loaded Vehicle

针对车辆悬架系统,分别基于天棚阻尼和地棚阻尼参考模型设计了两个滑模控制器,特别通过模糊控制法和层次分析法两种方法确定两种滑模控制器在控制过程中的权重来实现车辆在不同的速度下乘坐舒适性和操稳性的侧重。在不同的行驶速度和路况下分析了两种控制策略在随机路面激励条件下车身加速度、悬架动行程、轮胎动位移等性能指标的控制效果。结果表明:通过对加权系数的合理选取采用层次分析法的半主动悬架能够最显著地改善悬架各性能指标(低速下的乘坐舒适性,高速下的道路友好性),兼顾了在不同的行驶路况、工况下的综合性能。

Based on sky-hook damping and ground-hook damping reference model respectively,two sliding mode controllers are designed for semi-active suspension system.Through analytic hierarchy process and fuzzy logic control method,weighting coefficient of these two sliding mode controllers during the control process is determined to realize different level of riding comfort and driving stability under different vehicle speed.The vehicle's body acceleration,suspension dynamic deflection and tire dynamic displacement under random road excitation are studied to show effectiveness of the two control strategies under different speed and road condition.The results show that all performance specifications can be evidently improved with proper weighting coefficients.