US3870028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system for internal combustion engines
Assignee: Diamond Electric Manufacturing Co Ltd
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Filing: 1973-04-18
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Granted: 1975-03-11
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Expires: 1993-04-18
Abstract
Abstract An ignition system of capacitor discharge type for internal combustion engines having a DC source, an ignition transformer, a thyristor, a capacitor, a transistor and an oscillator. With all the elements in the system, the capacitor is discharged through the thyristor, transistor and primary winding of transformer when the transistor and thyristor are simultaneously rendered conductive in response to the appearance of a pulse from the oscillator. The capacitor is then charged by a counter electromotive force produced in the primary winding of the transformer in response to subsequent cut-off of the transistor.
Inventors
- 👤 Yoshio Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:23
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884; F02P3/09; F02P3/093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
215 words
An ignition system for internal combustion engines comprising an ignition transformer means having a primary and a secondary winding, and said primary winding being grounded at one end thereof through a transistor and connected at the other end thereof to a DC source through a diode, said the other end of said primary winding being further grounded through a thyristor and a capacitor connected in series, and said secondary winding being connected at one end thereof to an ignition plug, an oscillator means for generating at least one pulse having a predetermined pulse width every predetermined ignition timing of the engine in synchronism with the rotation of the engine, means for coupling the output pulse of said oscillator means to the base of said transistor, means for coupling the output pulse of said oscillator means to the gate of said thyristor, said thyristor, said transistor and said primary winding of said transformer means providing a discharge circuit for said capacitor when both said transistor and said thyristor are rendered conductive substantially simultaneously in response to the application of the output pulse from said oscillator means, and means for charging said capacitor by a counter electromotive force produced in said primary winding of said transformer means when said transistor in the conducting state is rendered non-conductive.
Claim 2
Dependent Claim
215 words
An ignition system for internal combustion engines comprising an ignition transformer means having a primary and a secondary winding, and said primary winding being grounded at one end thereof through a transistor and connected at the other end thereof to a DC source through a diode, said the other end of said primary winding being further grounded through a thyristor and a capacitor connected in series, and said secondary winding being connected at one end thereof to an ignition plug, an oscillator means for generating at least one pulse having a predetermined pulse width every predetermined ignition timing of the engine in synchronism with the rotation of the engine, means for coupling the output pulse of said oscillator means to the base of said transistor, means for coupling the output pulse of said oscillator means to the gate of said thyristor, said thyristor, said transistor and said primary winding of said transformer means providing a discharge circuit for said capacitor when both said transistor and said thyristor are rendered conductive substantially simultaneously in response to the application of the output pulse from said oscillator means, and means for charging said capacitor by a counter electromotive force produced in said primary winding of said transformer means when said transistor in the conducting state is rendered non-conductive.
Claim 3
Dependent Claim
215 words
An ignition system for internal combustion engines comprising an ignition transformer means having a primary and a secondary winding, and said primary winding being grounded at one end thereof through a transistor and connected at the other end thereof to a DC source through a diode, said the other end of said primary winding being further grounded through a thyristor and a capacitor connected in series, and said secondary winding being connected at one end thereof to an ignition plug, an oscillator means for generating at least one pulse having a predetermined pulse width every predetermined ignition timing of the engine in synchronism with the rotation of the engine, means for coupling the output pulse of said oscillator means to the base of said transistor, means for coupling the output pulse of said oscillator means to the gate of said thyristor, said thyristor, said transistor and said primary winding of said transformer means providing a discharge circuit for said capacitor when both said transistor and said thyristor are rendered conductive substantially simultaneously in response to the application of the output pulse from said oscillator means, and means for charging said capacitor by a counter electromotive force produced in said primary winding of said transformer means when said transistor in the conducting state is rendered nonconductive.
Claim 4
Dependent Claim
215 words
An ignition system for internal combustion engines comprising an ignition transformer means having a primary and a secondary winding, and said primary winding being grounded at one end thereof through a transistor and connected at the other end thereof to a DC source through a diode, said the other end of said primary winding being further grounded through a thyristor and a capacitor connected in series, and said secondary winding being connected at one end thereof to an ignition plug, an oscillator means for generating at least one pulse having a predetermined pulse width every predetermined ignition timing of the engine in synchronism with the rotation of the engine, means for coupling the output pulse of said oscillator means to the base of said transistor, means for coupling the output pulse of said oscillator means to the gate of said thyristor, said thyristor, said transistor and said primary winding of said transformer means providing a discharge circuit for said capacitor when both said transistor and said thyristor are rendered conductive substantially simultaneously in response to the application of the output pulse from said oscillator means, and means for charging said capacitor by a counter electromotive force produced in said primary winding of said transformer means when said transistor in the conducting state is rendered nonconductive.
Claim 5
Dependent Claim
38 words
An ignition system for internal combustion engines as claimed in claim 1, wherein said oscillator means generates at said predetermined ignition timing at least two pulses having a predetermined pulse width with a relatively short time interval therebetween.
Claim 6
Dependent Claim
36 words
An ignition system for internal combustion engines as claimed in claim 2, wherein only one of the output pulses of said oscillator means is coupled to the gate of said thyristor at said predetermined ignition timing.
Claim 7
Dependent Claim
158 words
An ignition system for internal combustion engines as claimed in claim 1, further comprising a second oscillator means and a second transformer means having a primary and a secondary winding, said primary winding of said second transformer means being grounded at one end thereof through a second transistor and connected at the other end thereof to said DC source, while said secondary winding of said second transformer means being connected at one end thereof to said capacitor through another diode and grounded directly at the other end thereof, and said second oscillator means being operative in such a manner that an output pulse, which appears substantially simultaneously with the appearance of the output pulse from said first oscillator means and disappears after the disappearance of the output pulse from said first oscillator means, is generated from said second oscillator means to be applied to said second transistor for maintaining said second transistor conductive during such period of time.
References Cited (Backward Citations)
US3357415A
Cited
US3368539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |