US4768474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-cycle motor having a fuel injection system for marine propulsions
Assignee: Yamaha Marine Co Ltd
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Filing: 1986-10-14
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Granted: 1988-09-06
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Expires: 2006-10-14
Abstract
Abstract An arrangement for controlling a two-cycle marine engine having a fuel injection system wherein the firing frequency of the cylinders is reduced under low speed running so as to improve fuel economy and engine performance by improving scavenging while the firing intervals between the cylinders is maintained uniform. The invention is disclosed as being applied to a number of variations of multiple cylinder engines and may be employed with spark ignited or diesel engines since the ignition system of the engine per se is not affected.
Inventors
- 👤 Hiroaki Fujimoto
- 👤 Hiroshi Tomita
- 👤 Tomohiro Kanamaru
- 👤 Katsumi Torigai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:03
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/10; F02D; F02D41/00; F02D41/008; F02D41/0087; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02B3/00; F02B3/06; F02D41/30; F02D41/38; F02D2041/389; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
In a two-cycle crankcase compression internal combustion engine having a plurality of cylinders, means for delivering an air charge to the crankcase of said engine, scavenge passage means extending from said crankcase to each of said cylinders for transferring an air charge from said crankcase to said cylinders, fuel injection means for delivering fuel for combustion to said cylinders, and means for reducing in a predetermined sequence the amount of fuel delivered to all of said fuel injection means in response to a predetermined condition sufficient to prevent combustion in each cylinder at its normal combustion interval of that cylinder for effecting firing of the individual cylinders at greater than the normal firing interval of the individual cylinder while maintaining an equal firing separation between the combustion in the cylinders to result in equal time spacing in the firing of the successive cylinders under all running conditions while increasing the timing at which each individual cylinder fires.
Claim 2
Dependent Claim
157 words
In a two-cycle crankcase compression internal combustion engine having a plurality of cylinders, means for delivering an air charge to the crankcase of said engine, scavenge passage means extending from said crankcase to each of said cylinders for transferring an air charge from said crankcase to said cylinders, fuel injection means for delivering fuel for combustion to said cylinders, and means for reducing in a predetermined sequence the amount of fuel delivered to all of said fuel injection means in response to a predetermined condition sufficient to prevent combustion in each cylinder at its normal combustion interval of that cylinder for effecting firing of the individual cylinders at greater than the normal firing interval of the individual cylinder while maintaining an equal firing separation between the combustion in the cylinders to result in equal time spacing in the firing of the successive cylinders under all running conditions while increasing the timing at which each individual cylinder fires.
Claim 3
Dependent Claim
34 words
In an internal combustion engine as set forth in claim 1 wherein the firing interval between cylinders is maintained uniformly but the firing order is changed when the amount of fuel delivered is reduced.
Claim 4
Dependent Claim
32 words
In an internal combustion engine as set forth in claim 1 wherein the fuel injection nozzles are supplied with fuel in response to the predetermined condition at greater intervals than 360 degrees.
Claim 5
Dependent Claim
27 words
In an internal combustion engine as set forth in claim 3 wherein the injection nozzles are supplied with fuel only every other revolution of the output shaft.
Claim 6
Dependent Claim
23 words
In an internal combustion engine as set forth in claim 3 wherein the predetermined condition is engine speed less than a predetermined speed.
Claim 7
Dependent Claim
21 words
In a internal combustion engine as set forth in claim 5 wherein the predetermined speed is determined by throttle valve position.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |