Title: Engine fault diagnosis

Abstract: An engine diagnostic apparatus includes a first transducer positioned in the oil filler neck of the engine for translating the crankcase pressure waveform into a corresponding electrical waveform having a frequency component proportional to engine speed. A second transducer is positioned to translate an exhaust pressure waveform emitted 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 two frequency components are compared to provide diagnostic information.

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Inventors: Hulls, Leonard R. (Marblehead, MA, US)
Hadden, Stephen C. (Acton, MA, US)
Armstrong, Lee R. (Newton, MA, US)

Application Number: 910891
Filing Date: 1978-05-30
Publication_date: 1980-02-26
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 73/117.3 701/101
Other Classes:
US Patent Ref:

3777559	Dec, 1973	Rennick et al.	73/117.
3977239	Aug, 1976	Hulls et al.	73/115.
3978719	Sep, 1976	Hadden et al.	73/115.

Other Refs:
Primary Examiner: Myrcale, Jerry W.
Assistant Examiner:
Attorney: Cohen; Samuel, Olson; Carl V.