3 . a method to convert the torsional vibration into individual cylinder combustion pressure using ims adaptive algorithm is putted forward . the position of misfire cylinder can pointed immediately using this method 熄火故障主要表现在作功冲程和正常情况不同，利用扭振信号辨识作功冲程压力大小，不仅能够诊断熄火缸的位置还能纵观各个气缸的作功情况。
