Device for determining malfunction of an engine cylinder

Details Device for determining malfunction of an engine cylinder Device for determining malfunction of an engine cylinder

1992-07-01

1994-05-10

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

123419, G01M 1500

Patent

active

053097564

ABSTRACT:
A device for determining a malfunction of an engine cylinder of an internal combustion engine, comprising a first detection unit for detecting a first engine speed at a predetermined first crank angle, and a detecting second engine speed at a predetermined second crank angle, during a power stroke of two engine cylinders under a continuous combustion cycle, a difference calculating unit for calculating a difference between the first and second engine speeds, a misfire determining unit for determining that a misfire has occurred in a corresponding engine cylinder when the difference is outside a predetermined limit, a malfunction determining unit for determining that a malfunction has occurred in the corresponding engine cylinders when a frequency at which the misfire determining unit determines that a misfire has occurred is larger than a predetermined frequency, a second detection unit for detecting a current engine load, and a first changing unit for changing at least one of the predetermined limit and the predetermined frequency in accordance with the current engine load.

REFERENCES:
patent: 3789816 (1974-02-01), Taplin et al.
patent: 5041980 (1991-08-01), Maddock et al.
patent: 5088318 (1992-02-01), Osawa
patent: 5105657 (1992-04-01), Nakaniwa

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