Demodulation of Instantaneous Rotational Speed of Diesel Engine Based on Hilbert Transform

摘要：

To measure diesel engine rotational speed,special 84teethed wheel is fixed across the engine output shaft,and magnetoelectric transducer mounted above the wheel. The induced electromotive force between the tooth and the sensor is measured,whose frequency characteristics contains the engine speed information. Engine instantaneous speed is extracted by counting process method and Hilbert demodulation method respectively,and their differences are analyzed Taking no tooth wheel indexing mismachining tolerance into consideration,the time resolution from the counting process mainly lies on the teeth number. While the number is limited,the result cannot be satisfactory. And its amplitude error can be guaranteed within need only by greater sampling frequency. Comparatively,time resolution of the engine instantaneous speed from the Hilbert methods depends on the sampling frequency,so it is relatively fine. And its error mainly results from the signal processing. Avoiding high sampling frequency demand.

关键词： diesel engine instantaneous rotational speed Hilbert transform magneto-electric transducer.

作者: Zhou Jia-Dong Ouyang Guang-Yao Gao Hong-Bin

作者单位: College of Marine and Power,Naval University of Engineering Wuhan 430033,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 1830-1833

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）