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US5170760A
Expired / Lapsed
US
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Ignition system for two cycle engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1991-11-13
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Granted: 1992-12-15
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Expires: 2011-11-13
Abstract
Abstract An improved method of operating a two cycle direct injected internal combustion engine so as to provide good ignition and combustion even when operating in a stratified condition. This is achieved either by extending the duration of firing of the spark plug either by extending a single firing or providing multiple firings per cycle or by changing the energy level across the gap of the spark plug during its firing.
Inventors
- 👤 Akira Yamada
- 👤 Miyoshi Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:52
CPC Classifications
F; F02; F02P; F02P15/00; F02P15/08; F02P9/00; F02P9/002; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02D; F02D2400/00; F02D2400/04; F02D41/00; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3023; F02D41/3029
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
85 words
A spark ignition system for an internal combustion engine having a combustion chamber, charge forming means for charging a fuel/air mixture into said combustion chamber, said charge forming means selectively charging said combustion chamber with either a stratified or a homogenous fuel/air charge, spark plug means in said combustion chamber for firing the fuel/air charge therein, and means for firing said spark plug means at a higher energy level or longer duration when said fuel/air charge is stratified than when said fuel/air charge is homogenous.
Claim 2
Dependent Claim
85 words
A spark ignition system for an internal combustion engine having a combustion chamber, charge forming means for charging a fuel/air mixture into said combustion chamber, said charge forming means selectively charging said combustion chamber with either a stratified or a homogenous fuel/air charge, spark plug means in said combustion chamber for firing the fuel/air charge therein, and means for firing said spark plug means at a higher energy level or longer duration when said fuel/air charge is stratified than when said fuel/air charge is homogenous.
Claim 3
Dependent Claim
32 words
A spark ignition system as set forth in claim 1 wherein the means for firing the spark plug means fires it at a higher energy level when the fuel/air charge is stratified.
Claim 4
Dependent Claim
32 words
A spark ignition system as set forth in claim 2 wherein the higher energy level is achieved by providing a greater current flow across the spark plug when the charge is stratified.
Claim 5
Dependent Claim
36 words
A spark ignition system as set forth in claim 3 wherein the higher energy level is derived from a capacitor discharge ignition system by charging the capacitor at a higher voltage when the charge is stratified.
Claim 6
Dependent Claim
32 words
A spark ignition system as set forth in claim 1 wherein the means for firing the spark plug fires the spark plug for a longer duration when the fuel/air charge is stratified.
Claim 7
Dependent Claim
28 words
A spark ignition system as set forth in claim 5 wherein the longer duration is achieved by providing a longer length of time which the spark plug fires.
Claim 8
Dependent Claim
36 words
A spark ignition system as set forth in claim 6 wherein the spark plug is fired by a capacitor discharge circuit and the time is firing is extended by multiple capacitor discharges during the spark interval.
Claim 9
Dependent Claim
30 words
A spark ignition system as set forth in claim 5 wherein the spark plug duration of firing is increased by firing the spark plug at a multiple number of times.
Claim 10
Dependent Claim
37 words
A spark ignition system as set forth in claim 8 wherein the multiple firing of the spark plug is achieved by a capacitor discharge circuit having a plurality of capacitors and thyristers for selectively discharging the capacitors.
Claim 11
Dependent Claim
47 words
A spark ignition system as set forth in claim 9 wherein there are a lesser number of capacitors and thyristers than the number of times the spark plug is fired so that each capacitor is discharged a plurality of times during a single cycle of the engine.
Claim 12
Dependent Claim
21 words
A spark ignition system as set forth in claim 1 wherein the engine operates on a two cycle crankcase compression principle.
Claim 13
Dependent Claim
28 words
A spark ignition system as set forth in claim 11 wherein the charge forming means comprises fuel injection means for directly charging a fuel into the combustion chamber.
Claim 14
Dependent Claim
32 words
A spark ignition system as set forth in claim 12 wherein the means for firing the spark plug means fires it at a higher energy level when the fuel/air charge is stratified.
Claim 15
Dependent Claim
32 words
A spark ignition system as set forth in claim 13 wherein the higher energy level is achieved by providing a greater current flow across the spark plug when the charge is stratified.
Claim 16
Dependent Claim
36 words
A spark ignition system as set forth in claim 14 wherein the higher energy level is derived from a capacitor discharge ignition system by charging the capacitor at a higher voltage when the charge is stratified.
Claim 17
Dependent Claim
32 words
A spark ignition system as set forth in claim 12 wherein the means for firing the spark plug fires the spark plug for a longer duration when the fuel/air charge is stratified.
Claim 18
Dependent Claim
28 words
A spark ignition system as set forth in claim 16 wherein the longer duration is achieved by providing a longer length of time which the spark plug fires.
Claim 19
Dependent Claim
36 words
A spark ignition system as set forth in claim 17 wherein the spark plug is fired by a capacitor discharge circuit and the time is firing is extended by multiple capacitor discharges during the spark interval.
Claim 20
Dependent Claim
30 words
A spark ignition system as set forth in claim 16 wherein the spark plug duration of firing is increased by firing the spark plug at a multiple number of times.
Claim 21
Dependent Claim
37 words
A spark ignition system as set forth in claim 19 wherein the multiple firing of the spark plug is achieved by a capacitor discharge circuit having a plurality of capacitors and thyristers for selectively discharging the capacitors.
Claim 22
Dependent Claim
47 words
A spark ignition system as set forth in claim 20 wherein there are a lesser number of capacitors and thyristers than the number of times the spark plug is fired so that each capacitor is discharged a plurality of times during a single cycle of the engine.
Claim 23
Independent Claim
90 words
A method of operating a spark ignition system for an internal combustion engine having a combustion chamber, charge forming means for charging a fuel/air mixture into the combustion chamber, the charge forming means selectively charging the combustion chamber with either a stratified or a homogenous fuel/air charge, spark plug means in the combustion chamber for firing the fuel/air charge therein, comprising the step of firing the spark plug means at a higher energy level or longer duration the said fuel/air charge is stratified then when the fuel/air charge is homogenous.
Claim 24
Independent Claim
90 words
A method of operating a spark ignition system for an internal combustion engine having a combustion chamber, charge forming means for charging a fuel/air mixture into the combustion chamber, the charge forming means selectively charging the combustion chamber with either a stratified or a homogenous fuel/air charge, spark plug means in the combustion chamber for firing the fuel/air charge therein, comprising the step of firing the spark plug means at a higher energy level or longer duration the said fuel/air charge is stratified then when the fuel/air charge is homogenous.
Claim 25
Dependent Claim
31 words
A method of operating a spark ignition system as set forth in claim 22 wherein the spark plug is fired at a higher energy level when the fuel/air charge is stratified.
Claim 26
Dependent Claim
36 words
A method of operating a spark ignition system as set forth in claim 23 wherein the higher energy level is achieved by providing a greater current flow across the spark plug when the charge is stratified.
Claim 27
Dependent Claim
40 words
A method of operating a spark ignition system as set forth in claim 24 wherein the higher energy level is derived from a capacitor discharge ignition system by charging the capacitor at a higher voltage when the charge is stratified.
Claim 28
Dependent Claim
30 words
A method of operating a spark ignition system as set forth in claim 22 wherein the spark plug is fired for a longer duration when the fuel/air charge is stratified.
Claim 29
Dependent Claim
32 words
A method of operating a spark ignition system as set forth in claim 26 wherein the longer duration is achieved by providing a longer length of time which the spark plug fires.
Claim 30
Dependent Claim
40 words
A method of operating a spark ignition system as set forth in claim 27 wherein the spark plug is fired by a capacitor discharge circuit and the time is firing is extended by multiple capacitor discharges during the spark interval.
Claim 31
Dependent Claim
34 words
A method of operating a spark ignition system as set forth in claim 26 wherein the spark plug duration of firing is increased by firing the spark plug at a multiple number of times.
Claim 32
Dependent Claim
41 words
A method of operating a spark ignition system as set forth in claim 29 wherein the multiple firing of the spark plug is achieved by a capacitor discharge circuit having a plurality of capacitors and thyristers for selectively discharging the capacitors.
Claim 33
Dependent Claim
50 words
A method of operating a spark ignition system as set forth in claim 30 wherein there are a lesser number of capacitors and thyristers than the number of times the spark plug is fired and each capacitor is discharged a plurality of times during a single cycle of the engine.
Claim 34
Dependent Claim
25 words
A method of operating a spark ignition system as set forth in claim 22 wherein the engine operates on a two cycle crankcase compression principle.
Claim 35
Dependent Claim
32 words
A method of operating a spark ignition system as set forth in claim 32 wherein the charge forming means comprises fuel injection means for directly charging a fuel into the combustion chamber.
Claim 36
Dependent Claim
31 words
A method of operating a spark ignition system as set forth in claim 33 wherein the spark plug is fired at a higher energy level when the fuel/air charge is stratified.
Claim 37
Dependent Claim
36 words
A method of operating a spark ignition system as set forth in claim 34 wherein the higher energy level is achieved by providing a greater current flow across the spark plug when the charge is stratified.
Claim 38
Dependent Claim
40 words
A method of operating a spark ignition system as set forth in claim 35 wherein the higher energy level is derived from a capacitor discharge ignition system by charging the capacitor at a higher voltage when the charge is stratified.
Claim 39
Dependent Claim
30 words
A method of operating a spark ignition system as set forth in claim 33 wherein the spark plug is fired for a longer duration when the fuel/air charge is stratified.
Claim 40
Dependent Claim
32 words
A method of operating a spark ignition system as set forth in claim 37 wherein the longer duration is achieved by providing a longer length of time which the spark plug fires.
Claim 41
Dependent Claim
40 words
A method of operating a spark ignition system as set forth in claim 38 wherein the spark plug is fired by a capacitor discharge circuit and the time is firing is extended by multiple capacitor discharges during the spark interval.
Claim 42
Dependent Claim
34 words
A method of operating a spark ignition system as set forth in claim 37 wherein the spark plug duration of firing is increased by firing the spark plug at a multiple number of times.
Claim 43
Dependent Claim
41 words
A method of operating a spark ignition system as set forth in claim 40 wherein the multiple firing of the spark plug is achieved by a capacitor discharge circuit having a plurality of capacitors and thyristers for selectively discharging the capacitors.
Claim 44
Dependent Claim
50 words
A method of operating a spark ignition system as set forth in claim 41 wherein there are a lesser number of capacitors and thyristers than the number of times the spark plug is fired and each capacitor is discharged a plurality of times during a single cycle of the 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) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |