Device and method for detecting a misfire state of an engine

Details Device and method for detecting a misfire state of an engine Device and method for detecting a misfire state of an engine

2005-02-08

2005-02-08

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

06851302

ABSTRACT:
A misfire detecting device and method detects a misfiring state of an engine. A memory stores misfire-frequency data relating to a frequency of occurrence of a misfire of the engine, and a controller determines, on the basis of the misfire-frequency data, whether the misfiring state of the engine has occurred. The controller initiates a misfire detecting operation of detecting an occurrence of the misfire of the engine when a predetermined first condition is satisfied, and initializes the misfire-frequency data stored in the memory when a predetermined second condition is satisfied. The first condition indicates that the engine has entered into its firing state by cranking of the engine for starting thereof, while the second condition indicates that the engine has failed to enter into its firing state by the cranking. The misfire detecting device permits accurate detection of the misfiring state of the engine, irrespective of repeated cranking operations of the engine due to its repeated firing failures.

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Air Resources Board, May 26, 1999.

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