汽油机爆震边缘检测的研究

Research on Knock Threshold Detection for Gasoline Engines

汽油机爆震的难点是爆震边缘点检测,爆震边缘点是汽油机点火闭环控制的前提。研究了利用振动信号检测汽油机爆震边缘的方法。研究表明,利用离散小波变换能够有效地从振动信号中检测出爆震边缘特征,而且利用一只振动传感器即可以有效地检测出多缸汽油机各缸的爆震边缘。

The knock threshold detection is the key of gasoline engine knock detection, and it is the key of the closed loop ignition control of gasoline engines. In this paper, the method of detecting knock threshold of gasoline engine using vibration signals was studied. The result shows that the knock threshold can be detected from engine surface vibration signals by using the discrete wavelet transform, and the knock threshold of each cylinder of multi-cylinder gasoline engine can be detected by one vibration transducer alone.