US4966115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means of internal combustion engine for marine propulsion
Assignee: Yamaha Marine Co Ltd
•
Filing: 1988-08-08
•
Granted: 1990-10-30
•
Expires: 2008-08-08
Abstract
Abstract A number of embodiments of engine spark control systems wherein the engine speed is reduced in response to the sensing of an abnormal or an external condition and wherein the spark timing is altered when the spark is interrupted to preclude the likelihood of backfiring in the exhaust system or firing back in the induction system. In some embodiments, the sensed condition is an abnormal running condition and in other embodiments the sensed condition is shifting of the transmission. The backfiring and firing back is precluded primarily by advancing the spark from the idle spark advance.
Inventors
- 👤 Kazumasa Ito
- 👤 Yosihide Hirano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1508; F02P11/00; F02P11/02; F02P5/1504; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y10; Y10S; Y10S477/00; Y10S477/906
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to an engine characteristic at a given speed range and a second, different advance curve in relation to said engine characteristic and within the given speed range, one of said advance curves providing a fixed spark advance and means for selecting which of said advance curves control spark timing within the given speed range.
Claim 2
Dependent Claim
82 words
In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to an engine characteristic at a given speed range and a second, different advance curve in relation to said engine characteristic and within the given speed range, one of said advance curves providing a fixed spark advance and means for selecting which of said advance curves control spark timing within the given speed range.
Claim 3
Dependent Claim
30 words
In a spark control for an internal combustion engine as set forth in claim 1 wherein the other of the spark advance curves provides varying advance with the engine characteristic.
Claim 4
Dependent Claim
62 words
In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to engine speed and a second, different advance curve in relation to said engine speed, and means for selecting which of said advance curves control spark timing response to shifting of an associated transmission.
Claim 5
Dependent Claim
62 words
In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to engine speed and a second, different advance curve in relation to said engine speed, and means for selecting which of said advance curves control spark timing response to shifting of an associated transmission.
Claim 6
Dependent Claim
26 words
In a spark control for an internal combustion engine as set forth in claim 3 wherein the engine is also misfired when the shifting is sensed.
Claim 7
Dependent Claim
27 words
In a spark control for an internal combustion engine as set forth in claim 3 wherein one of the spark advance curves provides a fixed spark advance.
Claim 8
Dependent Claim
29 words
In a spark control for an internal combustion engine as set forth in claim 3 wherein one of the spark advance curves provides varying advance with the engine speed.
Claim 9
Dependent Claim
26 words
In a spark control for an internal combustion engine as set forth in claim 6 wherein the other spark advance curves provides a fixed spark advance.
Claim 10
Dependent Claim
71 words
In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to an engine characteristic and a second, different advance curve in relation to said engine characteristic, and means for selecting which of said advance curves control spark timing for changing the spark advance curve employed in response to a sensed abnormal running condition.
Claim 11
Dependent Claim
71 words
In a spark control for an internal combustion engine comprising spark timing means for firing a spark plug in accordance with a first spark advance curve in relation to an engine characteristic and a second, different advance curve in relation to said engine characteristic, and means for selecting which of said advance curves control spark timing for changing the spark advance curve employed in response to a sensed abnormal running condition.
Claim 12
Dependent Claim
27 words
In a spark control for an internal combustion engine as set forth in claim 8 wherein one of the spark advance curves provides a fixed spark advance.
Claim 13
Dependent Claim
28 words
In a spark control for an internal engine as set forth in claim 9 wherein the fixed spark advance curve is advanced from the engine idle spark advance.
Claim 14
Dependent Claim
29 words
In a spark control for an internal combustion engine as set forth in claim 8 wherein one of the spark advance curves provides varying advance with the engine characteristic.
Claim 15
Dependent Claim
26 words
In a spark control for an internal combustion engine as set forth in claim 11 wherein the other spark advance curves provides a fixed spark advance.
Claim 16
Dependent Claim
28 words
In a spark control for an internal combustion engine as set forth in claim 8 wherein the engine is misfired in response to the abnormal sensed running condition.
Claim 17
Dependent Claim
43 words
In a spark control for an internal combustion engine as set forth in claim 13 wherein the means for selecting the advance curves selects a normal advance curve during normal engine running and a different advance curve when the abnormal condition is sensed.
Claim 18
Dependent Claim
28 words
In a spark control for an internal combustion engine as set forth in claim 14 wherein the abnormal spark advance curve provides an advance spark from idle spark.
References Cited (Backward Citations)
US4074665A
Cited
US3855985A
Cited
US4528970A
Cited
US4441478A
Cited
US4633834A
Cited
US4644927A
Cited
US4794897A
Cited
US4726798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |