EPS用SAW扭矩传感器结构优化及算法  

Structure optimization and algorithm of SAW torque sensor for EPS

作　　者：李志鹏[1] 马龙祥 孟旭 史松卓 LI Zhi-peng;MA Long-xiang;MENG XU;SHI Song-zhuo(Traffic College,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学交通学院,黑龙江哈尔滨150040

出　　处：《传感器与微系统》2019年第1期130-133,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(16051575097)

摘　　要：针对市场上已有的车载电动助力转向系统(EPS)扭矩传感器存在易受噪声干扰、供电困难等缺点,结合声表面波(SAW)器件灵敏度高、抗干扰能力强等特点,提出了根据SAW原理对转向扭矩测量的方案。基于车载EPS使用环境复杂、温度变化大的特点,提出了一种可以消除温度影响的EPS用SAW扭矩传感器结构设计方案。在信号处理方面,针对M-Rife算法在对频率估计时,估计结果总体会发生频率偏移和误差过大的问题,提出了一种基于Welch和迭代插值算法对M-Rife算法改进的新算法。仿真和试验结果表明:改进的算法在估计EPS用SAW扭矩传感器频率信号方面拥有较好的精度,优于单独使用M-Rife算法。Aiming at shortcomings of the existing electronic power steering( EPS) torque sensor are easily affected by noise,and power supply is difficult,combined with characteristics of high sensitivity and strong anti-interference ability of surface acoustic wave( SAW) device a steering torque measurement method is put forward according to the principle of SAW. Based on the characteristics of complex environment and large temperature variation of vehicle-mounted EPS,a structural design scheme of SAW torque sensor for EPS is proposed,which can eliminate temperature effects. In signal processing,aiming to the M-Rife algorithm in frequency estimation,the total of estimation results will occur frequency offset and the error is too large,a new algorithm of improved M-Rife algorithm based on Welch and iterative interpolation( IIN) algorithms is proposed. Simulation and test results show that the improved algorithm has better precision in estimation of SAW torque sensor frequency signal for EPS,it is prior to that while the M-Rife algorithm is simply used.

关 键 词：电动助力转向系统 声表面波 频率估计 温度补偿 M—Rife算法 Welch算法 迭代插值算法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]