Engine fault diagnosis

Details Engine fault diagnosis Engine fault diagnosis

G - Physics

01

M

354/24, 73/61

G01M 15/00 (2006.01) G01M 15/09 (2006.01) G01M 15/10 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1129097

Abstract An engine diagnostic apparatus includes a first transducer (10) positioned in the oil fill or neck (14) of an engine (9) for translating the crankcase pressure waveform into a corresponding electrical signal having a frequency component proportional to engine speed. A second transducer (52) is positioned to translate an exhaust pressure waveform omitted by the engine to a corresponding electrical waveform having a frequency component representative of an engine fault at a frequency proportional to engine speed. The engine speed signal , which is relatively free from components representative of engine faults, is used with the electrical waveform from the second transducer to derive cylinder firing and fault frequency components, which can be compared to provide diagnostic information.

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