基于转角差法的扭矩传感器设计

Research and Design of Torque Sensor Based on Angle Difference Method

为满足汽车传感器集成化、智能化的需要,解决接触式扭矩传感器的不足之处,设计了一种非接触式扭矩传感器,为汽车电动助力转向系统(Electric Power Steering,EPS)提供扭矩信号。扭矩测量采用差角的方法,利用巨磁阻角度传感器芯片获得角度数据,微控制器对角度数据计算处理后通过控制器局域网络(Controller Area Network,CAN)接口输出扭矩信号。该传感器具有无机械磨损、线性度高、性能稳定等特点,并且可以方便地实现绝对角度测量的功能。实验测量表明,该传感器表现出良好的线性特性。

In order to meet the integration and intelligence needs of automotive sensors and solve the disadvantage of contact torque sensors,a contactless torque sensor was developed,thus providing torque signals for automotive electric power steering system. Torque measurement was carried out by the method of steering angle difference,and angle values were measured by the GMR Angle Sensors,then the the torque value was figured out by micro controller unit and put out through Controller Area Network interface. The sensors could easily realize the function of measuring absolute angle values. The test result shows that the designed sensor has good linear properties.