US5117792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overrun preventing device for multi-cylinder engine
Assignee: Yamaha Marine Co Ltd
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Filing: 1990-07-30
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Granted: 1992-06-02
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Expires: 2010-07-30
Abstract
Abstract An overrun preventing device is disclosed which selectively causes misfires to occur in one, two or three cylinders of a six cylinder internal combustion engine based on the detected engine speed. This overrun preventing device operates to prevent the ignition plugs from getting wet with fuel so that after a misfire has occurred in one or more of the cylinders, those cylinders can be easily reignited if desired.
Inventors
- 👤 Isao Kanno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:33
CPC Classifications
F; F02; F02D; F02D17/00; F02D17/02; F02B; F02B77/00; F02B77/08; F02B77/085; F02B77/086; F02P; F02P9/00; F02P9/002; F02P9/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
An overrun preventing device for an internal combustion engine having a plurality of cylinders and ignition plugs, comprising an engine speed detector for detecting engine speed and a main ignition timing circuit for causing a misfire to occur in at least one of the cylinders selected at random based on a comparison between the detected engine speed and at least one preset engine speed so as to prevent the ignition plugs from getting wet with fuel so that the ignition plugs can be easily reignited.
Claim 2
Dependent Claim
85 words
An overrun preventing device for an internal combustion engine having a plurality of cylinders and ignition plugs, comprising an engine speed detector for detecting engine speed and a main ignition timing circuit for causing a misfire to occur in at least one of the cylinders selected at random based on a comparison between the detected engine speed and at least one preset engine speed so as to prevent the ignition plugs from getting wet with fuel so that the ignition plugs can be easily reignited.
Claim 3
Dependent Claim
111 words
An overrun preventing device for an internal combustion engine having six cylinders and ignition plugs, comprising an engine speed detector for detecting engine speed and a main ignition timing circuit for causing a misfire to occur in at least one of the cylinders based on a comparison between the detected engine speed and at least one preset engine speed so as to prevent the ignition plugs from getting wet with fuel so that the ignition plugs can be easily reignited, wherein, if the detected engine speed is between a first preset engine speed and a second preset engine speed, said main ignition timing circuit causes misfires to occur in three cylinders.
Claim 4
Dependent Claim
111 words
An overrun preventing device for an internal combustion engine having six cylinders and ignition plugs, comprising an engine speed detector for detecting engine speed and a main ignition timing circuit for causing a misfire to occur in at least one of the cylinders based on a comparison between the detected engine speed and at least one preset engine speed so as to prevent the ignition plugs from getting wet with fuel so that the ignition plugs can be easily reignited, wherein, if the detected engine speed is between a first preset engine speed and a second preset engine speed, said main ignition timing circuit causes misfires to occur in three cylinders.
Claim 5
Dependent Claim
40 words
An overrun preventing device as recited in claim 2, wherein, if the detected engine speed is between the second preset engine speed and a third preset engine speed, said main ignition timing circuit causes misfires to occur in two cylinders.
Claim 6
Dependent Claim
41 words
An overrun preventing device as recited in claim 3, wherein, if the detected engine speed is between the third preset engine speed and a fourth preset engine speed, said main ignition timing circuit causes a misfire to occur in one cylinder.
References Cited (Backward Citations)
US4336778A
Cited
US4404940A
Cited
US4462356A
Cited
JPS5963368A
Cited
US4492197A
Cited
US4638781A
Cited
US4736719A
Cited
US4768474A
Cited
US4883033A
Cited
US4977877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |