Title:
MISFIRE DETECTION DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3675049
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect precisely all misfire patterns generated in an internal combustion engine.
SOLUTION: In a misfire detecting device for an internal combustion engine 1, crank angular velocity variation amount for respective cylinders is determined based on a rotational signal NE corresponding to the rotation of a crankshaft, and the determined crank angular velocity variation amount for respective cylinders is compared with a prescribed misfire determination value to detect misfire generation in the engine. This is specially applied to a six-cylinder internal combustion engine. An ECU 9 determines angular velocity variation amount between respective cylinders for each difference calculus, using 720° CA difference calculus, 360° CA difference calculus and 120° CA difference calculus. Respective angular velocity variation amounts determined in this way are compared respectively with a prescribed misfire determination value, and the number of misfires is counted respectively based on the results calculated by the respective difference calculi. The ECU 9 conducts final determination of the presence of a misfire which occurs in the internal combustion engine 1 based on the data of a plurality of misfires counted.
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Inventors:
Kenji Yamamoto
Application Number:
JP21161996A
Publication Date:
July 27, 2005
Filing Date:
August 09, 1996
Export Citation:
Assignee:
株式会社デンソー
International Classes:
G01M15/04; F02D45/00; G01M15/00; (IPC1-7): F02D45/00; G01M15/00
Domestic Patent References:
| JP6002609A |
Attorney, Agent or Firm:
Hironobu Onda
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