基于电流变减振器的汽车半主动悬架最优控制

设计了一个混合模式电流变减振器,建立了相应的电流变减振器阻尼力数学模型。在l／4车辆动力学模型的基础上,考虑电流变减振器的阻尼特性,对车辆半主动悬架进行了线性二次型最优控制,设计了一个最优输出调节器。确定了最优控制的目标函数和加权矩阵。用龙格—库塔法解出了最优控制的反馈矩阵。仿真结果表明：最优控制能有效的降低车身加速度,提高车辆运行的平顺性和安全性;设计的电流变减振器结构合理,能满足半主动悬架最优控制的需要,电场强度小于3kV／mm;整个控制系统易于实现,能耗低,响应速度快,可用于半主动悬架的实时控制。

Optimal Control of Semi-Active Suspensions with ER Shock Absorber

An ER shock absorber with mixed mode is designed and its mathematical model is built. The optimal control method with LQ is applied to semi-active suspension systems in vehicle. A optimal output tuner is designed on basis of 1/4 dynamic model and the characteristics of the ER shock absorber. Its aim function and the weighting parameter matrix are determined. The feedback gain vector is found from solving the Algebraic Equation. The result shows that the optimal controller could not only diminish the body acceleration effectively but also improve the ride and handling characteristics. The construction of the ER shock absorber is reasonable and its performance meets the optimal control requirements of semi-active suspension system under the 3 kV/mm. In additional, the optimal control has low cost and energy consumption as well as rapid response . Such a system can meet with the requirements of semi-active suspension control completely.