Patent US5116259A successfully refreshed from Google Patents.
US5116259A
Expired / Lapsed
US
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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: 1992-05-26
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Expires: 2011-05-07
Abstract
Abstract A misfire detecting device for an internal combustion engine comprises an inner cylinder pressure detector, a crank angle detector, and a misfire detector for determining that a misfire has occurred when the inner cylinder pressure at a predetermined crank angle after top dead center in an engine combustion cycle is below a predetermined value.
Inventors
- 👤 Akira Demizu
- 👤 Akihiro Nakagawa
- 👤 Toshiki Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:39
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/11; G01M15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A misfire detecting device for an internal combustion engine having a cylinder, and a piston reciprocable within the cylinder and coupled to a crank shaft, said device comprising: pressure detecting means for detecting an internal pressure of said cylinder; crank angle detecting means for detecting a crank angle of said crank shaft; load detecting means for detecting a load of the engine; revolution number detecting means for detecting a revolution number of the engine; and misfire detecting means for determining that a misfire has occurred when the internal cylinder pressure at a predetermined crank angle after a top dead center of a compression stroke and during an engine combustion cycle, is below a predetermined value established from a combination of the detected engine load and the detected engine revolution number.
Claim 2
Dependent Claim
130 words
A misfire detecting device for an internal combustion engine having a cylinder, and a piston reciprocable within the cylinder and coupled to a crank shaft, said device comprising: pressure detecting means for detecting an internal pressure of said cylinder; crank angle detecting means for detecting a crank angle of said crank shaft; load detecting means for detecting a load of the engine; revolution number detecting means for detecting a revolution number of the engine; and misfire detecting means for determining that a misfire has occurred when the internal cylinder pressure at a predetermined crank angle after a top dead center of a compression stroke and during an engine combustion cycle, is below a predetermined value established from a combination of the detected engine load and the detected engine revolution number.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |