基于超前滞后校正器的汽车电动助力转向系统稳定性研究  

Research on Stability of Automotive EPS System Based on Lead-Lag Corrector

作　　者：夏鼎宽 邵雄 李根 司佳雨 陈建峰 Xia Dingkuan;Shao Xiong;Li Gen;Si Jiayu;Chen Jianfeng(BYD Auto Industry Corporation Limited,Shenzhen 518000)

机构地区：[1]比亚迪汽车工业有限公司,深圳518000

出　　处：《汽车工程师》2024年第9期38-43,48,共7页Automotive Engineer

摘　　要：为提高电动助力转向(EPS)系统的稳定性,提出一种基于超前滞后校正器的优化方案。首先,基于转向系统动力学理论建立EPS系统状态空间方程并求得系统传递函数;其次,基于系统传递函数推导出开环传递函数,并通过仿真分析超前滞后校正器对EPS系统稳定性的影响规律;最后,对EPS系统的超前滞后参数进行正向开发设计。仿真结果表明,校正后的开环传递函数的幅值裕度、相角裕度和截止频率较校正前有明显改善,设计的超前滞后校正器可大幅提高EPS系统稳定性。The phase angle lead characteristic and the amplitude attenuation characteristic of the lag network can be used to improve the performance of the lead and lag corrector system.Therefore,for the stability of Electric Power Steering(EPS)system,an optimization scheme based on lead and lag corrector is proposed.Firstly,the state space equation of EPS system is established based on the steering system dynamics theory and the system transfer function is obtained.Secondly,the open loop transfer function is derived based on the system transfer function,and the influence of the lead and lag corrector on the stability of EPS system is analyzed by simulation.Finally,forward development and design are deployed for lead and lag parameters development.The results show that the amplitude margin,phase Angle margin and cutoff frequency of the open loop transfer function after correction are obviously improved compared with that before correction,and the designed lead lag corrector can greatly improve the stability of EPS system.

关 键 词：电动助力转向系统 车辆模型 超前滞后校正 稳定性 

分 类 号：U463.444[机械工程—车辆工程]