Procedure for diagnosis of fuel supply system of IC engine has recording of variation of fuel pressure in system, formation of frequency spectrum of fuel pressure variation and analysis thereof

摘要

A procedure for the diagnosis of a fuel supply system of an IC engine has the following steps: - recording of the variation of the fuel pressure in the fuel supply system (2); - formation of the frequency spectrum of the fuel pressure variation; and - analysis of the frequency spectrum (4,5). The analysis of the frequency spectrum comprises the following steps: - comparison of the variation of the recorded frequency spectrum with the variation of the frequency spectrum of a fuel system working in fault-free fashion; and - should discrepancies between the variations of frequency spectra be present, classification of the discrepancies according to the type of fault in the fuel supply system by which they are generated.