US3747582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system for multicylinder internal combustion engine
Assignee: Denso Corp
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Filing: 1972-03-03
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Granted: 1973-07-24
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Expires: 1992-03-03
Abstract
Abstract An ignition system for a multicylinder internal combustion engine comprising an ignition power source, a capacitor, a pair of charging circuits, a pair of discharging circuits, a pair of ignition coils each having a primary and a secondary winding, and at least one ignition plug connected to each of the secondary windings of the ignition coils. In the system, the charging circuits are arranged to charge the capacitor in directions opposite to each other, and the primary windings of the ignition coils are disposed in such circuit portions of the discharging circuits where these circuits do not overlap each other.
Inventors
- 👤 M Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:39
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/03; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884; F02P11/00; F02P11/02; F02P11/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
294 words
An ignition system for use in a mUlticylinder internal combustion engine each cylinder of which has at least one spark plug comprising a capacitor, a power source for charging said capacitor, a first charging circuit including a series connection of said power source, said capacitor and a first switching means controlling the charge-discharge of said capacitor so that current supplied from said power source can pass successively through said capacitor and said first switching means, a second charging circuit including a series connection of said power source, said capacitor and a second switching means controlling the charge-discharge of said capacitor so that current supplied from said power source can pass successively through said capacitor and said second switching means, a first discharging circuit including a series connection of said capacitor, said first switching means and a first diode so that the discharge stored in said capacitor can be discharged through said first switching means and said first diode, a second discharging circuit including a series connection of said capacitor, said second switching means and a second diode so that the charge stored in said capacitor can be discharged through said second switching means and said second diode, and a first and a second ignition coils each including a primary and a secondary windings, said first and second charging circuits being arranged to charge said capacitor in directions opposite to each other, said primary windings of said first and second ignition coils being connected in series with said first and second switching means in such circuit portions of said first and second discharging circuits where said two discharging circuits do not overlap each other, and each of said secondary windings of said first and second ignition coils being connectable to each of said spark plug.
Claim 2
Dependent Claim
294 words
An ignition system for use in a mUlticylinder internal combustion engine each cylinder of which has at least one spark plug comprising a capacitor, a power source for charging said capacitor, a first charging circuit including a series connection of said power source, said capacitor and a first switching means controlling the charge-discharge of said capacitor so that current supplied from said power source can pass successively through said capacitor and said first switching means, a second charging circuit including a series connection of said power source, said capacitor and a second switching means controlling the charge-discharge of said capacitor so that current supplied from said power source can pass successively through said capacitor and said second switching means, a first discharging circuit including a series connection of said capacitor, said first switching means and a first diode so that the discharge stored in said capacitor can be discharged through said first switching means and said first diode, a second discharging circuit including a series connection of said capacitor, said second switching means and a second diode so that the charge stored in said capacitor can be discharged through said second switching means and said second diode, and a first and a second ignition coils each including a primary and a secondary windings, said first and second charging circuits being arranged to charge said capacitor in directions opposite to each other, said primary windings of said first and second ignition coils being connected in series with said first and second switching means in such circuit portions of said first and second discharging circuits where said two discharging circuits do not overlap each other, and each of said secondary windings of said first and second ignition coils being connectable to each of said spark plug.
Claim 3
Dependent Claim
82 words
An ignition system as claimed in claim 1, in which said capacitor charging power source comprises a magneto generator having a pair of capacitor charging coils therein, one of said capacitor charging coils being disposed in said first charging circuit, while the other said capacitor charging coil being disposed in said second charging circuit, and a pair of current rectifying diodes are connected between said capacitor charging coils and said capacitor in series therewith in said first and second charging circuits respectively.
Claim 4
Dependent Claim
166 words
An ignition system as claimed in claim 1, in which said capacitor charging power source comprises a magneto generator having a single capacitor charging coil therein, a transformer operatively connected to said magneto generator, said transformer including a first, a second and a third cores, a primary coil wound on said first core and connected to said capacitor charging coil, a first and a second secondary coils wound on said second and third cores and connected to said first and second charging circuits respectively, whereby a first closed magnetic circuit is formed by said first core mounting said primary coil thereon and said second core mounting said first secondary coil thereon, and a second closed magnetic circuit is formed by said first core and said third core mounting said second secondary coil thereon, and a pair of current rectifying diodes are connected between said first and second secondary coils of said transformer and said capacitor in series therewith in said first and second charging circuits respectively.
Claim 5
Dependent Claim
86 words
An ignition system as claimed in claim 1, in which said capacitor charging power source comprises a magneto generator having a single capacitor charging coil therein, both ends of said capacitor charging coil being connected to said first and second charging circuits respectively, and a pair of current rectifying diodes are connected between said capacitor charging coil and said capacitor in series therewith in such circuit portions of said first and second charging circuits where said charging circuits overlap said first and second discharging circuits respectively.
Claim 6
Dependent Claim
18 words
An ignition system as claimed in claim 4, In which said magneto generator is provided with six poles.
Claim 7
Dependent Claim
116 words
An ignition system as claimed in claim 4, in which said magneto generator is provided with four poles, and said first and second switching means comprises a first and a second thyristors having a gate respectively and a first and a second ignition signal supplying means connected to the gate of said first and second thyristors respectively, said first and second ignition signal supplying means being adapted to apply alternately a set of two ignition signals to the gate of said first and second thyristors respectively in a 180* spaced apart relationship, the ignition signals in each set being 90* out of phase from each other in the angular position of rotation of said magneto generator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |