Detecting malfunction in cylinders of internal combustion engine

Details Detecting malfunction in cylinders of internal combustion engine Detecting malfunction in cylinders of internal combustion engine

1975-06-19

1976-08-03

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

039722309

ABSTRACT:
An apparatus for, and method of, detecting the uneven operation of the individual cylinders in an internal combustion engine, and for diagnosing the cause thereof. The engine is operated at any convenient idle speed. Power cycle time periods between successive ignition times are measured, the deceleration rates between successive time periods are then computed, and finally the average deceleration rates for the respective cylinders are computed. Misfires occurring randomly in cylinders are detected when individual deceleration rates exceed the average deceleration rate for the corresponding cylinder by a predetermined limit amount. Repeated malfunctioning in an individual cylinder is detected when the average deceleration rate for the weakest cylinder exceeds that for the strongest cylinder by a predetermined limit amount.

REFERENCES:
patent: 3592053 (1971-07-01), Lucia

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