基于无线传输的助力自行车中轴力矩测量系统的设计与研究

Design and Study of Mid-axis Torque Measuring System of Power Assisted Cycle Based on Wireless transmission

摘要:

针对当前助力自行车力矩测量系统传感器体积较大、开发成本高、测量精度低以及中轴旋转过程中无法使用有线测量等问题,设计了一种基于应变检测原理和无线传输技术的新型力矩测量系统。该系统采用XKT-412高精度无线传输芯片及PIC12F1822单片机实现系统的软硬件设计,包括硬件电路设计、信号采集、信号处理及相关数据处理算法,且该系统体积小,成本较低。实验测试表明,输出频率与施加的力矩之间存在明显的线性关系,且实际输出频率与理论输出频率之间的误差小于0.5%,测量系统的输出特性符合设计要求,具有很好的推广及实际应用价值。

Abstract:

In order to solve the problems of large sensor volume, high development cost, low measurement accuracy and the inability to use wired measurement in the process of rotation of the mid-axis of the current torque measurement system, a novel torque measurement system based on strain detection principle and wireless transmission technology is designed. The system uses XKT-412 wireless transmission chip and PIC12F1822 single-chip microcomputer to realize the design of hardware and software, including hardware circuit design, signal acquisition, signal processing and related data processing algorithms, and the system is small in size and low in cost. The experimental results show that there is an obvious linear relationship between the output frequency and the applied moment, and the error between the actual output frequency and the theoretical output frequency is less than 0.5%. The output features of the measurement system meet the design requirements, which has a good promotion and application value.