Engine fault diagnosis

Details Engine fault diagnosis Engine fault diagnosis

1978-05-30

1980-02-26

Myrcale, Jerry W.

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

041899407

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.

REFERENCES:
patent: 3777559 (1973-12-01), Rennick et al.
patent: 3977239 (1976-08-01), Hulls et al.
patent: 3978719 (1976-09-01), Hadden et al.

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