Method For Engine Combustion Diagnosis Based On Mechanical Abnormality Using Engine Vibration Signal and Combustion Diagnosis System Thereof

摘要

The method for diagnosing mechanical combustion abnormality using the engine vibration signal of the combustion abnormality diagnosis system 1 for the engine 10 of the present invention includes a signal component due to rotational excitation of the engine 10 by the diagnostic controller 30. Modulation frequency transformation is performed on the measured vibration signal, and the frequency multiple peak is identified as an odd multiple of the problem occurrence condition vibration signal analysis compared to the normal condition vibration signal analysis of integer multiples, and the set value (Threshold) By including the engine vibration signal analysis control (S10 to S60) in which the cylinder with the combustion abnormality problem is determined by the peak value of the above region, the combustion abnormal signal generation cylinder at the time of measurement is accurately determined from the odd multiple difference component compared to the integer multiple difference extracted from the vibration signal. implement the feature.