Engine diagnosis from frequency components in exhaust

Details Engine diagnosis from frequency components in exhaust Engine diagnosis from frequency components in exhaust

1976-01-02

1976-08-31

Gill, James J.

Measuring and testing

Vehicle drive train

Rear end

G01M 1500

Patent

active

039772390

ABSTRACT:
An engine diagnostic apparatus includes a transducer for translating an exhaust pressure waveform emitted by an engine to a corresponding complex electrical signal having a prominent fundamental frequency component which represents the cylinder firing frequency and varies in direct proportion with engine speed, and having a subharmonic frequency component at a frequency which is a submultiple of the fundamental frequency. The subharmonic frequency component and the fundamental frequency component are separated from the complex electrical signal and from each other. A comparator compares the amplitude of the subharmonic frequency component with the amplitude of the fundamental frequency component to provide a measure of the unevenness of power strokes from individual cylinders of the engine.

REFERENCES:
patent: 3868625 (1975-02-01), Speigner et al.

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