Abstract:

To solve the change of elastic ally compressed pulse disturbed by fuel injector and the vibration of cylinder head when the fuel injection fault of diesel engine happens, a method for diagnosing fuel in- jection fault by measuring the vibration of the diesel engine cylinder head is presented. Firstly, the high pass filtering method is used to reduce the combustion vibration signal interference under the cut off fre- quency of 5 kHz. Then, by using the constant angle resamples, the signal is transferred from time domain to angle domain to eliminate the effect of speed fluctuation on signal processing. Finally, since the fil- tered signal is disturbed by other non-white noise, the method of PARAFAC is applied to separate signals to reduce the influence of non-white noise. The fuel injection fault of diesel engine is diagnosed by taking the energy of cylinder head vibration nearby top dead center as feature value. The result shows that this method could be used to diagnose the fuel injection fault of diesel engine effectively.

Key words: power machinery engineering, fuel injection fault of diesel engine, constant angle resample, adaptive parallel factor