车用无接触式扭矩传感器的信号采集与处理

Signal Collection and Processing for Non-contact Automotive Torque Sensor

扭矩传感器是汽车电动助力转向(EPS)系统中的关键部件之一,为了提高其工作性能,提出了一种针对EPS系统的非接触式扭矩传感器信号采集与处理方案。首先,对传感器的应用环境进行了介绍,给出了传感器探测电感元件的安装方法和电路的框图。接着,对电路的各个模块进行了说明,重点分析说明了基于运放的相敏检波模块和基于数字电位器的智能调整模块。然后,给出了智能调整模块的软件设计流程图。最后,介绍了所用的实验装置,进行了传感器性能测试试验,验证了各个模块的工作及关键点的波形.实验数据表明电路工作稳定,输出线性度较好,能满足汽车EPS系统使用的要求。由于探测部分采用了非接触的工作方式,其使用寿命和性能均优于传统的电阻式扭矩传感器。

Torque sensor is one of the key components in the Electric Power Steering （EPS） system. A design of signal collection and processing of non-contact torque senor for EPS system is provided, in order to improve the performance of torque sensor. In the begin- ning, the paper describes the application environment of the torque sensor, with the installation of detecting induetors and the block di- agram of the circuit. In the following section the paper describes the implementation of each circuit module, with details of the phase sensitive detecting module based on OP-Amplifier and the intelligently adjusting module based on digital potentiometers. Then, the software flowchart for the Intelligently Adjusting module is provided. Finally, the paper presents the experimental devices for the test, the Torque Sensor performance test and that, verfies each module is working and its waveform at key points. The data collected from the test shows that the designed circuits are suitable for the application to EPS system with the feature of high stability and good linearity of output. As the detection part works under non-contact mode, its performance and operating life are superior to the conventional resis- tive torque sensor.