| 摘要:分别采用计数法和频率解调法得到了柴油机的瞬时转速。比较表明:计数法得到的结果时间分辨率取决于齿轮齿数,因此时间分辨率差；计数法的幅值误差主要取决于采样频率,因此需要很高的采样频率。而频率解调法得到的瞬时转速时间分辨率取决于采样频率,时间分辨率好；频率解调法误差主要来源于采样噪声和信号处理过程,该方法不需要很高的采样频率,可用于实时获取瞬时转速值。 |
| 关键词: 柴油机 瞬时转速 频率解调 磁电传感器 |
|
| Calculation of Instantaneous Rotational Speed of Diesel Engine Based on Frequency Demodulation Method |
| Wang Minghe,Xu Jinliang,Ji Chenlong |
| Naval Deputy Office of 431.Factory, Liaoning Huludao 125004 |
| Abstract:Instantaneous rotational speed of diesel engine is calculated by using counting method and Hilbert transform method, respectively. The results show that time resolution ratio obtained by counting method is limited by number of gear teeth, thus is not accurate. The amplitude error is significantly influenced by sample frequency, which needs to be very high to insure small error. Time resolution ratio of instantaneous rotational speed obtained by frequency demodulation method depends on sample frequency, so it is much more accurate. The error by frequency demodulation method mainly comes from noise and signals processing procedures, and therefore doesn't need high sample frequency, and is applicable in obtaining instantaneous rotational speed value. |
| Key words: diesel engine instantaneous rotational speed frequency demodulation magneto-electric transducer |
