汽车转向器试验台数学模型设计和仿真

Design and simulation of mathematical model for automobile steering gear

对汽车转向器的电液力加载系统建立传递函数数学模型,给出了时域和频域特性。根据试验台技术指标,设计PI控制器,使相位裕度增加,不但有利于系统稳定,还可减弱系统振荡程度,改善动态性能。又设计了前馈补偿器,通过软件补偿,去除干扰力,能够满足性能指标。实际被动加载实验表明,其精度满足技术要求,并且系统工作稳定可靠。

For the automobile steering gear employed by the marine rudder, its transfer function mathematical model is established, and feature of the time and frequency domains are presented. Based on the specifications of test-bed, a PI controller is designed, increasing phase margin. A feed-forward compensator by software compensation, eliminate anti-interference and meet per- formance index. Practical load-experiment results indicate that this system can work steadily also satisfies design requirements.