Engine diagnosis from frequency components in exhaust

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

G - Physics

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G01M 15/00 (2006.01) G01L 23/08 (2006.01) G01L 23/24 (2006.01) G01M 15/10 (2006.01)

Patent

CA 1074011

RCA 69,643 ENGINE DIAGNOSIS FROM FREQUENCY COMPONENTS IN EXHAUST Abstract of the Disclosure 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. -1-

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