EPS声表面波扭矩传感器仿真分析与试验研究

Simulation Analysis and Experimental Study to SAW Torque Sensor of the EPS

提出了一种基于声表面波(SAW)原理的电动助力转向(EPS)扭矩传感器,利用支撑底座与支撑平面将原本粘贴于扭杆上的SAW谐振器分离开,避免了对扭杆的破坏性安装方式,扩展了可测量扭杆的尺寸范围。借助有限元仿真软件对传感器结构进行三维建模,分析扭杆、传感器框架、SAW谐振器三者在扭矩作用下的受力与应变情况,研究SAW谐振器特征频率的漂移量与扭矩之间的关系。在EPS试验台架上进行满量程对比试验,对比结果验证了仿真模型的有效性,也证明了新型传感器的可行性。

An electric power steering torque sensor based on the principle of surface acoustic wave is proposed.The SAW resonator attached to the torsion bar is separated by the support base and the support plane,which avoids the destructive installation of the torsion bar.This design expands the size range of the torsion bar.With the help of finite element simulation software,the threedimensional model of the sensor structure is established,and the stress and strain of torsion bar,sensor frame and SAW resonator under the action of torque are analyzed,and the relationship between the drift of characteristic frequency of SAW resonator and torque is studied.The full scale contrast test is carried out on the EPS test bench.The comparison results verify the validity of the simulation model and the feasibility of the new sensor.