US5349299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply misfire-detecting system for internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1992-12-11
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Granted: 1994-09-20
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Expires: 2012-12-11
Abstract
Abstract A misfire-detecting system detects a misfire occurring in an internal combustion engine. A value of sparking voltage for discharging a spark plug of the engine is detected. A differentiating circuit differentiates the detected value of the sparking voltage. A misfire-determining circuit compares the differential value of the sparking voltage with a predetermined value, and determines, based upon a result of the comparison, whether a misfire has occurred in the engine.
Inventors
- 👤 Masaki Kanehiro
- 👤 Yuichi Shimasaki
- 👤 Takuji Ishioka
- 👤 Shigeki Baba
- 👤 Takashi Hisaki
- 👤 Shigeru Maruyama
- 👤 Masataka Chikamatsu
- 👤 Shukoh Terata
- 👤 Kenichi Maeda
- 👤 Kazuhito Kakimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:03
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/12; F02P2017/125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
276 words
In a misfire-detecting system for detecting a misfire occurring in an internal combustion engine having an ignition system including at least one spark plug, engine operating condition-detecting means for detecting values of operating parameters of said engine, signal-generating means for determining ignition timing of said engine, based upon values of operating parameters of said engine detected by said engine operating condition-detecting means and generating an ignition command signal indicative of said determined ignition timing, and sparking voltage-generating means responsive to said ignition command signal for generating sparking voltage for discharging said at least one spark plug, and voltage value-detecting means for detecting a value of said sparking voltage generated by said sparking voltage-generating means after generation of said ignition command signal, the improvement comprising: differentiating means, connected to said voltage value-detecting means, for differentiating a value of said sparking voltage detected by said voltage value-detecting means; misfire-determining means, connected to said differentiating means, for comparing a differential value of said sparking voltage obtained by said differentiating means with a predetermined value, and for determining, based upon a result of said comparison, whether a misfire has occurred in said engine; and time period-limiting means, inserted into a path from said voltage value-detecting means to said misfire-determining means and connected to said signal generating means, for setting a comparison period of time upon which said comparison, of said differential value of said sparking voltage with said predetermined value, is to be made, and wherein said misfire-determining means compares said differential value of said sparking voltage with said predetermined value to determine occurrence of a misfire solely during said comparison period of time set by said time period-setting means.
Claim 2
Dependent Claim
276 words
In a misfire-detecting system for detecting a misfire occurring in an internal combustion engine having an ignition system including at least one spark plug, engine operating condition-detecting means for detecting values of operating parameters of said engine, signal-generating means for determining ignition timing of said engine, based upon values of operating parameters of said engine detected by said engine operating condition-detecting means and generating an ignition command signal indicative of said determined ignition timing, and sparking voltage-generating means responsive to said ignition command signal for generating sparking voltage for discharging said at least one spark plug, and voltage value-detecting means for detecting a value of said sparking voltage generated by said sparking voltage-generating means after generation of said ignition command signal, the improvement comprising: differentiating means, connected to said voltage value-detecting means, for differentiating a value of said sparking voltage detected by said voltage value-detecting means; misfire-determining means, connected to said differentiating means, for comparing a differential value of said sparking voltage obtained by said differentiating means with a predetermined value, and for determining, based upon a result of said comparison, whether a misfire has occurred in said engine; and time period-limiting means, inserted into a path from said voltage value-detecting means to said misfire-determining means and connected to said signal generating means, for setting a comparison period of time upon which said comparison, of said differential value of said sparking voltage with said predetermined value, is to be made, and wherein said misfire-determining means compares said differential value of said sparking voltage with said predetermined value to determine occurrence of a misfire solely during said comparison period of time set by said time period-setting means.
Claim 3
Dependent Claim
71 words
A misfire-detecting system as claimed in claim 1, further including delay means, inserted into a path from said voltage value-detecting means to said misfire-determining means, for delaying a value of said sparking voltage detected by said voltage-detecting means, by a predetermined period of time, and wherein said misfire-determining means compares a value of said sparking voltage delayed by said delay means and differentiated by said differentiating means with said predetermined value.
Claim 4
Dependent Claim
52 words
A misfire-detecting system as claimed in claim 2, wherein said time period-limiting means sets said comparison period of time at a time which is delayed by a period of time corresponding to said predetermined period of time by which said detected value of said sparking voltage is delayed by said delay means.
Claim 5
Dependent Claim
67 words
A misfire-detecting system as claimed in any of claims 1, 2 or 3, further including second misfire-determining means, connected to said voltage value-detecting mean said second misfire-determining means measures a period of time over which a value of said sparking voltage detected by said voltage-detecting means exceeds a predetermined value, and determines that a misfire has occurred, when said measured period of time exceeds a predetermined value.
Claim 6
Dependent Claim
75 words
A misfire-detecting system as claimed in any of claims 1, 2 or 3, further including third misfire-determining means, connected to said voltage value-detecting means, for comparing a value of said sparking voltage detected by said voltage value-detecting means with a predetermined value after a predetermined period of time has elapsed after generation of said ignition command signal, and determining, based upon a result of said last-mentioned comparison, whether a misfire has occurred in said engine.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |