摘要
为从JC型传感器获得较准确的转矩转速信号,根据其工作原理寻找合理的信号处理方法,获得电信号和转矩转速信号的转换。采用PIC18F458单片机,通过对传感器输出两路正弦电信号进行放大、滤波及整形处理后并获得两个同频信号的方波,应用RS触发电路将两路正弦信号的相位差变为触发器输出脉冲的宽度。通过脉冲计数法测量方波信号的频率获得转速,利用等精度法检测RS触发器的输出脉冲宽度求取转矩,同时运用滑动平均提高信号的准确性和稳定性。实验结果表明,该方法可有效地测量转矩转速信号,且在电动汽车和机械动力装置仪器中具有实用价值。
A reasonable signal processing method for the conversion between electrical signal and torque speed signal is proposed according to the working principle of JC sensor to obtain more accurate torque and speed signal. In this experiment,PIC18F458 microcontroller is used to magnify,filter,and shape two sinusoidal electrical output signals of the JC sensor to gain two same frequency square waves,and RS flip-flop to convert the phase difference of the two sinusoidal signal into the pulse width the flip-flop＇s output. The pulse count method is adopted to measure the square wave signal＇s frequency to obtain speed,the equal precision measuring method to detect the output pulse width of the RS flip-flop to obtain torque,and the moving average is also used to improve accuracy and stability of the signal. The experimental results show that the proposed method can effectively measure the torque and rotary speed,and has practical value on the application in electric vehicles and mechanical power plant instrumentation.
出处
《电子科技》
2014年第9期132-136,共5页
Electronic Science and Technology
关键词
JC型传感器
转速
转矩
相位差
信号处理
JC sensor
rotary speed
torque
phase difference
signal processing
