直线电机式主动悬架建模与试验研究

Modeling and Experimental Study of Active Suspension with Linear Motor

为实现悬架的主动减振,将直线电机作为汽车主动悬架的作动器。首先建立了1/4车辆主动悬架和直线电机的数学模型,并通过台架试验测试直线电机的输出电磁力,仿真结果与测试吻合较好,验证了直线电机数学模型的正确性;接着采用电流滞环控制和最优控制相结合的方法,根据路面激励状况,控制直线电机作动器输出相应主动力。最后采用d SPACE开发最优控制系统对主动悬架进行了试验。结果表明,所设计的控制系统能有效改善车辆舒适性和行驶安全性。

Linear motor is used as the actuator of vehicle active suspension to realize active vibration atten- uation of suspension. Firstly, the mathematical models for both quarter-vehicle active suspension and linear motor are established, and a bench test is conducted to measure the output electromagnetic force of linear motor. The sim- ulation results agree well with test data, verifying the correctness of mathematical model for linear motor. Then by combining current hysteresis control strategy with optimal control scheme, linear motor, as actuator, is controlled to output active force according to road surface excitation. Finally, an optimal control system is developed by dSPACE to test active suspension. The results show that the control system designed can effectively improve the ride comfort and driving safety of vehicle.