Snap acceleration method of diagnosing faults in internal combus

Details Snap acceleration method of diagnosing faults in internal combus Snap acceleration method of diagnosing faults in internal combus

1980-08-01

1983-08-09

Gruber, Felix D.

Boots, shoes, and leggings

731173, 36443101, G01M 1500, G06F 1546

Patent

active

043982590

ABSTRACT:
A method and apparatus are disclosed for diagnosing faults in individual cylinders of an internal combustion engine. An engine (12) is accelerated, while an analyzer (10) provides measurements of the time intervals required for the engine to rotate for successive, equal angular increments as the engine is being accelerated, where each increment is a fraction of the rotation required for a single engine cylinder power contribution. The values of the resulting sequence of time interval measurements generally undulate with time about an average value due to the power contribution of each individual cylinder, with the average value of the time interval measurements and the magnitude of the undulations about this average value generally decreasing with time due to the acceleration of the engine. The analyzer (10) modifies the time interval measurements in the sequence so as to provide a modified sequence having a substantially constant average value and substantially constant magnitude of undulation. The analyzer (10) then compares the characteristics of the individual undulations in the modified sequence so as to diagnose faults in the individual cylinders in the engine.

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patent: 4064747 (1977-12-01), Rackliffe et al.
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patent: 4181944 (1980-01-01), Yamauchi et al.
patent: 4295363 (1981-10-01), Buck et al.
patent: 4302815 (1981-11-01), Tedeschi et al.

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