Method and a relative device for diagnosing misfire or...

Measuring and testing – Vehicle chassis – Steering

Reexamination Certificate

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Reexamination Certificate

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11367806

ABSTRACT:
A method of diagnosing misfire or partial combustion conditions in an internal combustion engine without using a phonic wheel discriminates the combustion conditions with soft-computing techniques directly exploiting a combustion pressure signal generated by a common pressure sensor installed in the cylinder. There exists an exploitably close correlation between the instantaneous values of the internal cylinder pressure and the occurrence of misfire or partial combustion conditions, and thus the cylinder pressure signal may be reliably used for diagnosing misfires or partial combustions in functioning conditions of the engine.

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“Cylinder Air/Fuel Ratio Estimation Using Net Heat Release Data”, Tunestal et al; IFAC Workshop on Advances in Automotive Control, Mar. 28, 2001, pp. 239-247, XP001032740.
“Cylinder Air/Fuel Ratio Estimation Using Net Heat Release Data”, Tunestal et al; Control Engineering Practice, Pergamon Press, Oxford, GB, vol. 11, No. 3, 2003, pp. 311-318, XP001157572, ISSN: 0967-0661.
Patent Abstracts of Japan, vol. 011, No. 208, Jul. 7, 1987 & JP62030932, Feb. 9, 1987.

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