Diagnostic Internal Combustion Engine Based on Crankshaft Angular Acceleration

Internal combustion (IC) engine is a complex power generating machines and used widely in automotive industry, which the failure rate is high. Carrying out the IC engine fault diagnostic methods have been studied and still a lasting topic for scientists. Crankshaft instantaneous angular acceleration, which evaluated by second derivative of the crankshaft rotation respect to time contains a little information for fault diagnostic. In this paper, phase modulation signal is derived from the phase of an analytical signal which evaluated by using the Hilbert Transform technicque. To verify the signal analysis technique, the engine model created originally by John J. Moskwa needs to be extended to produce fluctuation of the crankshaft angular acceleration and to implement the extended model into the dSPACE equipment to control and diagnose the IC engine.