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为提高汽车乘坐舒适性和操纵稳定性,以二自由度非线性悬架系统为研究对象,以车身垂直加速度和悬架动挠度为控制量,设计非线性悬架系统的分数阶PI~λD~μ控制器,通过遗传算法获取分数阶PI~λD~μ控制器最优整定参数,仿真结果表明,在多种行驶工况下,分数阶PI~λD~μ控制比整数阶PID控制具有更加灵活的调节性能,能明显改善悬架综合性能,有效提高汽车行驶的平顺性和稳定性,为非线性主动悬架控制提供一种新方法.
In order to improve the ride comfort and steering stability of a vehicle, the nonlinear two-degree-of-freedom suspension system is taken as the research object, and the vertical acceleration of the vehicle body and the dynamic deflection of the suspension are taken as the control variables to design the fractional PI ~ λD ~ μ controller, the optimal tuning parameters of fractional order PI ~ λD ~ μ controller are obtained by genetic algorithm. The simulation results show that fractional order PI ~ λD ~ μ control is more flexible than integer order PID under various driving conditions The tuning performance can obviously improve the overall performance of the suspension, effectively improve the ride comfort and stability of the vehicle, and provide a new method for the control of the nonlinear active suspension.