摘要
瞬时转速测量的主要误差为晶振脉冲计数误差和转角计量误差。转角计量误差包括角标器分度误差,曲轴扭振产生的误差。论文对瞬时转速的滤波方法进行了分析,认为FIR低通滤波器对高频干扰有抑制作用,对低频干扰信号抑制作用较差,不适于瞬时转速信号滤波。切比雪夫与巴特沃思滤波器对低频干扰信号的抑制效果更好,推荐采用6阶巴特沃思低通滤波器对瞬时转速信号滤波。
It is shown that the error of transient engine speed measurement comes from both the time interval counter and crank angle measure. The angular measurement error includes the errors caused by angle encoder, torsion vibration of the crankshaft. Mounting the angle encoder on flywheel end will help to improve the accuracy of transient speed neasurement. Lowpass FIR digital filter can filter high frequency noise and has little effect on low frequency disturbances,and is therefore not suitable for transient speed's measurement. Chebyshev lowpass filter and Butterworth lowpss IIR digital filter give better results for suppressing low frequency disturbances,and 6'th order Butterworth lowpass digital is recommended for transient speed measurements.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2002年第5期522-525,共4页
Chinese Journal of Scientific Instrument
基金
清华大学汽车安全与节能国家重点实验室开放基金资助项目。
关键词
内燃机
瞬时转速
测试系统
数字滤波
Internal combustion engines Transient engine speed Digital filter
