US3794008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark ignition system
Assignee: Cooper Industries LLC
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Filing: 1972-05-18
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Granted: 1974-02-26
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Expires: 1992-05-18
Abstract
Abstract A spark ignition system is designed for a two-stroke or fourstroke cycle internal combustion engine and having first and second cylinders with pistons arriving at the combustion dead center position and the non-combustion dead center position thereof simultaneously. First and second sparkplugs in each cylinder are joined to the corresponding terminals of an ignition distributor energizing one of the sparkplugs in one cylinder at an effective cycle time and simultaneously energizing the corresponding sparkplug in the other cylinder at an ineffective cycle time. Both remaining sparkplugs are similarly energized. The two sparkplugs in any cylinder are fired effectively once each cycle but a few degrees of engine rotation apart.
Inventors
- 👤 C Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:51
CPC Classifications
F; F02; F02P; F02P15/00; F02P15/02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A spark ignition system for a reciprocating piston internal combustion engine operating on a multi-stroke cycle and having at least first and second separate cylinders with separate pistons arriving at dead center position at approximately the same time comprising first and second sparkplugs in each of said cylinders, a rotary ignition distributor, means for driving said distributor from said engine, a first ignition circuit connected to said first sparkplug in said first cylinder and to said first sparkplug in said second cylinder, a second ignition circuit connected to said second sparkplug in said first cylinder and to said second sparkplug in said second cylinder, means including said distributor for energizing said first ignition circuit and simultaneously firing both of said first sparkplugs to initiate combustion in one of said cylinders at one predetermined time in the cycle of said engine, and means including said distributor for energizing said second ignition circuit during said combustion and simultaneously firing both of said second sparkplugs at a later predetermined time in the cycle of said engine.
Claim 2
Dependent Claim
173 words
A spark ignition system for a reciprocating piston internal combustion engine operating on a multi-stroke cycle and having at least first and second separate cylinders with separate pistons arriving at dead center position at approximately the same time comprising first and second sparkplugs in each of said cylinders, a rotary ignition distributor, means for driving said distributor from said engine, a first ignition circuit connected to said first sparkplug in said first cylinder and to said first sparkplug in said second cylinder, a second ignition circuit connected to said second sparkplug in said first cylinder and to said second sparkplug in said second cylinder, means including said distributor for energizing said first ignition circuit and simultaneously firing both of said first sparkplugs to initiate combustion in one of said cylinders at one predetermined time in the cycle of said engine, and means including said distributor for energizing said second ignition circuit during said combustion and simultaneously firing both of said second sparkplugs at a later predetermined time in the cycle of said engine.
Claim 3
Dependent Claim
43 words
A system as in claim 1 in which said first sparkplugs are farther from the center of their respective cylinders than are said second sparkplugs, and said first circuit is energized earlier in the cycle of said engine than is said second circuit.
Claim 4
Dependent Claim
247 words
A spark ignition system for a reciprocating piston engine having at least first and second separate combustion chambers comprising means for operating said engine to provide events in said first combustion chamber beginning at a predetermined time and in sequence as follows: fuel mixture admission, fuel mixture compression, fuel mixture expansion, fuel mixture exhaust and to provide in said second combustion chamber beginning at a later time and in sequence as follows: fuel mixture admission, fuel mixture compression, fuel mixture expansion, fuel mixture exhaust; first and second sparkplugs in said first combustion chamber; third and fourth sparkplugs in said second combustion chamber; means for firing said first sparkplug toward the end of said compression event in said first combustion chamber to initiate combustion therein and for simultaneously firing said third sparkplug toward the end of said exhaust event in said second combustion chamber; means for firing said second sparkplug in said first combustion chamber during said combustion a few degrees of engine operation after said firing of said first sparkplug and simultaneously firing said fourth sparkplug; means for firing said third sparkplug toward the end of said compression event in said second combustion chamber to initiate combustion therein and for simultaneously firing said first sparkplug toward the end of said exhaust event in said first combustion chamber; and means for firing said fourth sparkplug during said combustion in said second combustion chamber a few degrees after firing of said third sparkplug and simultaneously firing said second sparkplug.
Claim 5
Dependent Claim
247 words
A spark ignition system for a reciprocating piston engine having at least first and second separate combustion chambers comprising means for operating said engine to provide events in said first combustion chamber beginning at a predetermined time and in sequence as follows: fuel mixture admission, fuel mixture compression, fuel mixture expansion, fuel mixture exhaust and to provide in said second combustion chamber beginning at a later time and in sequence as follows: fuel mixture admission, fuel mixture compression, fuel mixture expansion, fuel mixture exhaust; first and second sparkplugs in said first combustion chamber; third and fourth sparkplugs in said second combustion chamber; means for firing said first sparkplug toward the end of said compression event in said first combustion chamber to initiate combustion therein and for simultaneously firing said third sparkplug toward the end of said exhaust event in said second combustion chamber; means for firing said second sparkplug in said first combustion chamber during said combustion a few degrees of engine operation after said firing of said first sparkplug and simultaneously firing said fourth sparkplug; means for firing said third sparkplug toward the end of said compression event in said second combustion chamber to initiate combustion therein and for simultaneously firing said first sparkplug toward the end of said exhaust event in said first combustion chamber; and means for firing said fourth sparkplug during said combustion in said second combustion chamber a few degrees after firing of said third sparkplug and simultaneously firing said second sparkplug.
Claim 6
Dependent Claim
37 words
A system as in claim 3 in which said first and third sparkplugs are remote from the center of said combustion chambers and said second and fourth sparkplugs are close to the center of said combustion chambers.
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |