MISFIRE DETECTION DEVICE FOR INTERNAL COMBUSTION ENGINE

Title:

MISFIRE DETECTION DEVICE FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

Japanese Patent JP3449170

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a misfire detection device for an internal combustion engine which can remarkably improve accuracy of misfire detection.
SOLUTION: An engine ECU 30 calculates rotational fluctuation in each cylinder based on results of an engine speed sensor 25 which senses rotation of an engine 1. Misfire is determined when the difference between the result and a specified learned value exceeds a reference value to light a misfire indication lamp 12. The ECU holds reference values corresponding to the engine speeds as maps, and allows updating of the learned value as principle when a load relevant value is smaller than the reference value. The updating of the learned value is allowed within a wide range differently from a conventional technique where the learned value can be updated only at the time of fuel cutting. Chance of updating is remarkably increased for improving reliability of the learned value used for determination of misfire.

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Inventors:

Susumu Shinohara
Tomohiro Fujita

Application Number:

JP13974397A

Publication Date:

September 22, 2003

Filing Date:

May 29, 1997

Export Citation:

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