US5127262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Misfire detecting device of an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1991-05-07
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Granted: 1992-07-07
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Expires: 2011-05-07
Abstract
Abstract A misfire detecting device of an internal combustion engine comprises a pressure detector(s) for detecting an inner cylinder pressure of the engine, a crank angle detector for detecting a crank angle, and a misfire detector for detecting a misfire based on signals from the pressure detector and the crank angle detector. The misfire detector judges that the engine is under a misfire, when a comparison is made between a first integrated value of an indicated inner cylinder pressure before a predetermined crank angle of a combustion cycle of the engine and a second integrated value of the indicated inner cylinder pressure after the predetermined crank angle, and when there is a difference between the first value and the second value by less than a predetermined value.
Inventors
- 👤 Akira Demizu
- 👤 Akihiro Nakagawa
- 👤 Toshiki Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
165 words
A misfire detecting device for an internal combustion engine, comprising: a) pressure detecting means for detecting an inner cylinder pressure of the engine; b) crank angle detecting means for detecting a crank angle; and c) misfire detecting means for detecting a misfire based on signals from the pressure detecting means and the crank angle detecting means; d) said misfire detecting means comprising: 1) means for generating a first integrated value of the detected inner cylinder pressure extending over a predetermined angular range before a predetermined crank angle during a compression cycle of the engine, 2) means for generating a second integrated value of the detected inner cylinder pressure extending over said predetermined angular range after said predetermined crank angle during a combustion cycle of the engine, and 3) means for comparing the first and the second integrated values and for judging that the engine is misfiring when there is a difference between the first and the second integrated values of less than a predetermined amount.
Claim 2
Dependent Claim
165 words
A misfire detecting device for an internal combustion engine, comprising: a) pressure detecting means for detecting an inner cylinder pressure of the engine; b) crank angle detecting means for detecting a crank angle; and c) misfire detecting means for detecting a misfire based on signals from the pressure detecting means and the crank angle detecting means; d) said misfire detecting means comprising: 1) means for generating a first integrated value of the detected inner cylinder pressure extending over a predetermined angular range before a predetermined crank angle during a compression cycle of the engine, 2) means for generating a second integrated value of the detected inner cylinder pressure extending over said predetermined angular range after said predetermined crank angle during a combustion cycle of the engine, and 3) means for comparing the first and the second integrated values and for judging that the engine is misfiring when there is a difference between the first and the second integrated values of less than a predetermined amount.
Claim 3
Dependent Claim
28 words
The misfire detecting device for an internal combustion engine according to claim 1, wherein the predetermined crank angle is a top dead center between compression and combustion cycles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |