US5205254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air fuel injector and control
Assignee: Yamaha Motor Co Ltd
•
Filing: 1991-12-10
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Granted: 1993-04-27
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Expires: 2011-12-10
Abstract
Abstract A fuel/air injector for a crankcase compression two-cycle internal combustion engine and control strategy therefore wherein under a first load range of the engine which is generally a low speed, low load range, fuel is supplied to the fuel/air injector at a time which does not precede the opening of the injector valve and then as the load and speed of the engine increase, the timing of opening of the injector valve is advanced until a certain condition is reached and thereafter the opening of the injector valve is held constant and the timing of fuel supply is advanced so that fuel supply precedes the opening of the injector valve.
Inventors
- 👤 Takeshi Ito
- 👤 Yoshihiko Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:03
CPC Classifications
F; F02; F02M; F02M67/00; F02M67/10; F02M67/12; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
178 words
A fuel/air injector unit comprising an outer housing assembly defining chamber means, air means for supplying air under pressure to said chamber means, fuel means for supplying fuel to said chamber means, an injector port communicating said chamber means with an engine chamber, an injector valve for opening and closing said injector port, sensor means for sensing engine running conditions and control means for controlling fuel delivery by said fuel means to said chamber means and opening and closing of said injector valve in response to sensed engine conditions for varying at least the opening of said injector valve at certain sensed engine conditions, holding the time of opening of said injector valve constant in at least a range of sensed conditions, varying at least the initiation of fuel delivery by said fuel means at certain sensed running conditions, and initiating the fuel delivery of said fuel means beginning at a time before said injector valve is opened and terminating at a time after said injector valve is opened under at least one running condition of said engine.
Claim 2
Dependent Claim
178 words
A fuel/air injector unit comprising an outer housing assembly defining chamber means, air means for supplying air under pressure to said chamber means, fuel means for supplying fuel to said chamber means, an injector port communicating said chamber means with an engine chamber, an injector valve for opening and closing said injector port, sensor means for sensing engine running conditions and control means for controlling fuel delivery by said fuel means to said chamber means and opening and closing of said injector valve in response to sensed engine conditions for varying at least the opening of said injector valve at certain sensed engine conditions, holding the time of opening of said injector valve constant in at least a range of sensed conditions, varying at least the initiation of fuel delivery by said fuel means at certain sensed running conditions, and initiating the fuel delivery of said fuel means beginning at a time before said injector valve is opened and terminating at a time after said injector valve is opened under at least one running condition of said engine.
Claim 3
Dependent Claim
32 words
A fuel/air injector as set forth in claim 1 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 4
Dependent Claim
45 words
A fuel/air injector as set forth in claim 1 wherein there is a second running condition of the engine wherein the control means effects initiation of fuel delivery by the fuel means at a time which does not precede the opening of the injector valve.
Claim 5
Dependent Claim
32 words
A fuel/air injector as set forth in claim 3 wherein the duration of duel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 6
Dependent Claim
34 words
A fuel/air injector as set forth in claim 1 further including further fuel supply means for supplying additional fuel to the engine as the load of the engine increases during the one running condition.
Claim 7
Dependent Claim
24 words
A fuel/air injector as set forth in claim 1 wherein the fuel/air injector unit delivers fuel directly to the combustion chamber of the engine.
Claim 8
Dependent Claim
32 words
A fuel/air injector as set forth in claim 6 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 9
Dependent Claim
45 words
A fuel/air injector as set forth in claim 6 wherein there is a second running condition of the engine wherein the control means effects initiation of fuel delivery by the fuel means at a time which does not precede the opening of the injector valve.
Claim 10
Dependent Claim
32 words
A fuel/air injector as set forth in claim 8 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 11
Dependent Claim
50 words
A fuel/air injector as set forth in claim 6 wherein the engine is two-cycle crankcase compression engine and has scavenge port means for delivering a charge to the combustion chamber from a crankcase chamber and exhaust port means for discharging a burnt charge from the combustion chamber to the atmosphere.
Claim 12
Dependent Claim
32 words
A fuel/air injector as set forth in claim 10 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 13
Dependent Claim
45 words
A fuel/air injector as set forth in claim 10 wherein there is a second running condition of the engine wherein the control means effects initiation of fuel delivery by the fuel means at a time which does not precede the opening of the injector valve.
Claim 14
Dependent Claim
32 words
A fuel/air injector as set forth in claim 12 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 15
Dependent Claim
30 words
A fuel/air injector as set forth in claim 10 wherein the timing of the opening of the injector valve is after the timing at which the scavenge port is opened.
Claim 16
Dependent Claim
32 words
A fuel/air injector as set forth in claim 14 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 17
Dependent Claim
46 words
A fuel air injector as set forth in claim 14 wherein there is a second running condition of the engine wherein the control means effects initiation of fuel delivery by the fuel means at a time which does not precede the opening of the injector valve.
Claim 18
Dependent Claim
32 words
A fuel/air injector as set forth in claim 16 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 19
Dependent Claim
36 words
A fuel/air injector as set forth in claim 1 wherein less fuel is injected by the fuel means before the injector valve is opened than after the injector valve is opened during the one running condition.
Claim 20
Independent Claim
158 words
A method of operating a fuel/air injector unit comprising an outer housing assembly defining chamber means, air means for supplying air under pressure to said chamber means, fuel means for supplying fuel to said chamber means, an injector port communicating said chamber means with an engine chamber, an injector valve for opening and closing said injector port, sensor means for sensing engine running conditions, said method comprising the steps of varying at least the opening of said injector valve at certain sensed engine conditions, holding the time of opening of said injector valve constant in at least a range of sensed conditions, varying at least the initiation of fuel delivery by said fuel means at certain sensed running conditions, and initiating the fuel delivery of said fuel means beginning at a time before said injector valve is opened and terminating at a time after said injector valve is opened under at least one running condition of said engine.
Claim 21
Independent Claim
158 words
A method of operating a fuel/air injector unit comprising an outer housing assembly defining chamber means, air means for supplying air under pressure to said chamber means, fuel means for supplying fuel to said chamber means, an injector port communicating said chamber means with an engine chamber, an injector valve for opening and closing said injector port, sensor means for sensing engine running conditions, said method comprising the steps of varying at least the opening of said injector valve at certain sensed engine conditions, holding the time of opening of said injector valve constant in at least a range of sensed conditions, varying at least the initiation of fuel delivery by said fuel means at certain sensed running conditions, and initiating the fuel delivery of said fuel means beginning at a time before said injector valve is opened and terminating at a time after said injector valve is opened under at least one running condition of said engine.
Claim 22
Dependent Claim
37 words
A method of operating a fuel air injector as set forth in claim 19 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 23
Dependent Claim
52 words
A method of operating a fuel/air injector as set forth in claim 19 wherein there is a second running condition of the engine and initiation of fuel delivery by the fuel means is begun at a time which does not precede the opening of the injector valve during the second running condition.
Claim 24
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 21 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 25
Dependent Claim
44 words
A method of operating a fuel/air injector as set forth in claim 19 further including the step of supplying additional fuel to the engine as the load of the engine increases during the one running condition by a source other than the fuel/air injector.
Claim 26
Dependent Claim
28 words
A method of operating a fuel/air injector as set forth in claim 19 wherein the fuel/air injector unit delivers fuel directly to the combustion chamber of the engine.
Claim 27
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 24 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 28
Dependent Claim
52 words
A method of operating a fuel/air injector as set forth in claim 24 wherein there is a second running condition of the engine and initiation of fuel delivery by the fuel means is begun at a time which does not precede the opening of the injector valve during the second running condition.
Claim 29
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 26 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 30
Dependent Claim
54 words
A method of operating a fuel/air injector as set forth in claim 19 wherein the engine is two-cycle crankcase compression engine and has scavenge port means for delivering a charge to the combustion chamber from a crankcase chamber and exhaust port means for discharging a burnt charge from the combustion chamber to the atmosphere.
Claim 31
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 28 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 32
Dependent Claim
39 words
A method of operating a fuel/air injector as set forth in claim 29 wherein the timing of opening of the injector valve is held constant after the timing of the delivery of fuel from the fuel means is advanced.
Claim 33
Dependent Claim
51 words
A method of operating a fuel/air injector as set forth in claim 28 wherein there is a second running condition of the engine and initiation of fuel delivery by the fuel means begins at a time which does not precede the opening of the injector valve during the second running condition.
Claim 34
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 31 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 35
Dependent Claim
34 words
A method of operating a fuel/air injector as set forth in claim 28 wherein the timing of the opening of the injector valve is after the timing at which the scavenge port is opened.
Claim 36
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 33 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 37
Dependent Claim
51 words
A method of operating a fuel/air injector as set forth in claim 33 wherein there is a second running condition of the engine and initiation of fuel delivery by the fuel means begins at a time which does not precede the opening of the injector valve during the second running condition.
Claim 38
Dependent Claim
36 words
A method of operating a fuel/air injector as set forth in claim 35 wherein the duration of fuel injection is increased as the load of the engine increases during the one running condition of the engine.
Claim 39
Dependent Claim
40 words
A method of operating a fuel/air injector as set forth in claim 19 wherein less fuel is injected by the fuel means before the injector valve is opened than after the injector valve is opened during the one running condition.
References Cited (Backward Citations)
US5020504A
Cited
US5105792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |