US3677253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor discharge type ignition system for internal combustion engines
Assignee: Denso Corp
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Filing: 1970-08-20
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Granted: 1972-07-18
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Expires: 1990-08-20
Abstract
Abstract In a capacitor discharge type ignition system for internal combustion engines, which generates ignition sparks between electrodes of a spark plug by rapidly discharging a charged capacitor through the primary circuit of an ignition coil, the improvement residing in that the said primary circuit is provided with additional reactance elements so that said reactance elements constitute an oscillation circuit including said primary circuit, to thereby extend the duration of the ignition spark and ensure relative and effective operation of the ignition system.
Inventors
- 👤 Kazuo Oishi
- 👤 Tokuhiro Kurebayashi
- 👤 Noriyoshi Ando
- 👤 Noboru Yamamoto
- 👤 Hiroshi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:23
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
107 words
A capacitor discharge type ignition system for internal combustion engine comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit comprising a second capacitor, the primary winding of an ignition coil and a switching element connected in series with one another, and a reactor connected across the said series connection of said primary winding and said second capacitor such that said second capacitor is discharged through said reactor and primary winding in the direction opposite to the direction of discharging of said first capacitor through the primary winding.
Claim 2
Dependent Claim
107 words
A capacitor discharge type ignition system for internal combustion engine comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit comprising a second capacitor, the primary winding of an ignition coil and a switching element connected in series with one another, and a reactor connected across the said series connection of said primary winding and said second capacitor such that said second capacitor is discharged through said reactor and primary winding in the direction opposite to the direction of discharging of said first capacitor through the primary winding.
Claim 3
Dependent Claim
17 words
A capacitor discharge type ignition system according to claim 1 wherein said reactor is a saturable reactor.
Claim 4
Dependent Claim
121 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a first discharging circuit, through which said first capacitor is discharged to cause a spark at a spark plug, said first discharging circuit including a second capacitor, the primary winding of an ignition coil and a switching element, a second discharging circuit, through which said second capacitor is discharged, said second discharging circuit including a diode, a reactor and said primary winding, wherein the discharging circuit for the discharge of said second capacitor after the reversal of The polarity of said second capacitor is formed by said primary winding, said reactor and a switching means having a breakdown character.
Claim 5
Dependent Claim
121 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a first discharging circuit, through which said first capacitor is discharged to cause a spark at a spark plug, said first discharging circuit including a second capacitor, the primary winding of an ignition coil and a switching element, a second discharging circuit, through which said second capacitor is discharged, said second discharging circuit including a diode, a reactor and said primary winding, wherein the discharging circuit for the discharge of said second capacitor after the reversal of The polarity of said second capacitor is formed by said primary winding, said reactor and a switching means having a breakdown character.
Claim 6
Dependent Claim
17 words
A capacitor discharge type ignition system according to claim 3, wherein said reactor is a saturable reactor.
Claim 7
Dependent Claim
178 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter and discharged through the primary winding of an ignition coil and a switching element to cause a spark at a spark plug, wherein a second capacitor, said primary winding and said switching element form a first discharging circuit, through which said first capacitor is discharged, a diode, a first reactor and said primary winding form a second discharging circuit, through which said second capacitor is discharged, and said primary winding, said reactor and a switching means having an opposite breakdown character with respect to said diode form a third discharging circuit, through which said second capacitor after the reversal of the polarity thereof is discharged, said ignition system further including a second reactor connected between said first capacitor and the output terminal of said DC-to-DC converter and a third capacitor connected to the connection between the output terminal of said DC-to-DC converter and said second reactor and charged by the output voltage of said DC-to-DC converter.
Claim 8
Dependent Claim
178 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter and discharged through the primary winding of an ignition coil and a switching element to cause a spark at a spark plug, wherein a second capacitor, said primary winding and said switching element form a first discharging circuit, through which said first capacitor is discharged, a diode, a first reactor and said primary winding form a second discharging circuit, through which said second capacitor is discharged, and said primary winding, said reactor and a switching means having an opposite breakdown character with respect to said diode form a third discharging circuit, through which said second capacitor after the reversal of the polarity thereof is discharged, said ignition system further including a second reactor connected between said first capacitor and the output terminal of said DC-to-DC converter and a third capacitor connected to the connection between the output terminal of said DC-to-DC converter and said second reactor and charged by the output voltage of said DC-to-DC converter.
Claim 9
Dependent Claim
18 words
A capacitor discharge type ignition system according to claim 5, wherein said first reactor is a saturable reactor.
Claim 10
Dependent Claim
103 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit including a second capacitor, the primary winding of an ignition coil and a switching element connected in series, a first reactor connected in parallel with the series circuit of said second capacitor and said primary winding, and a series circuit including a third capacitor and a second reactor, said last-mentioned series circuit being connected in parallel with the series circuit of said second capacitor and said primary winding.
Claim 11
Dependent Claim
103 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit including a second capacitor, the primary winding of an ignition coil and a switching element connected in series, a first reactor connected in parallel with the series circuit of said second capacitor and said primary winding, and a series circuit including a third capacitor and a second reactor, said last-mentioned series circuit being connected in parallel with the series circuit of said second capacitor and said primary winding.
Claim 12
Dependent Claim
19 words
A capacitor discharge type ignition system according to claim 7, wherein said first and second reactors are saturable reactors.
Claim 13
Dependent Claim
108 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit including a second capacitor, the primary winding of an ignition coil and a switching element connected in series, a first reactor connected to the output terminal of said DC-to-DC converter, a third capacitor charged by the output voltage of said DC-to-DC converter through said first reactor, and a second reactor connected between the connection between said first reactor and said third capacitor and the connection between said primary winding and said switching element.
Claim 14
Dependent Claim
108 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit including a second capacitor, the primary winding of an ignition coil and a switching element connected in series, a first reactor connected to the output terminal of said DC-to-DC converter, a third capacitor charged by the output voltage of said DC-to-DC converter through said first reactor, and a second reactor connected between the connection between said first reactor and said third capacitor and the connection between said primary winding and said switching element.
Claim 15
Dependent Claim
17 words
A capacitor discharge type ignition system according to claim 9, wherein said first reactor is saturable reactor.
Claim 16
Dependent Claim
95 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit including a first reactor, the primary winding of an ignition coil and a switching element is connected in series, a first series circuit including said first reactor and a second capacitor and connected in parallel with said first capacitor, and a second series circuit including a second reactor and a third capacitor and connected in parallel with said switching element.
Claim 17
Dependent Claim
95 words
A capacitor discharge type ignition system comprising a DC-to-DC converter, a first capacitor charged by the output voltage of said DC-to-DC converter, a discharging circuit, through which said first capacitor is discharged, said discharging circuit including a first reactor, the primary winding of an ignition coil and a switching element is connected in series, a first series circuit including said first reactor and a second capacitor and connected in parallel with said first capacitor, and a second series circuit including a second reactor and a third capacitor and connected in parallel with said switching element.
Claim 18
Dependent Claim
111 words
A capacitor discharge type ignition system comprising: a DC-to-DC converter, at least one first capacitor charged by the output Voltage of said DC-to-DC converter, a series circuit including an ignition coil primary winding and a switching device adapted to be turned on and off, a main circuit, including said series circuit, through which the charge stored in said capacitor is discharged when said switching device is on for producing current through said primary winding, and an oscillation circuit including a series connection of a second capacitor, an inductive reactance and said primary winding for prolonging the duration of current through said primary winding beyond the turning off of said switching device.
Claim 19
Dependent Claim
111 words
A capacitor discharge type ignition system comprising: a DC-to-DC converter, at least one first capacitor charged by the output Voltage of said DC-to-DC converter, a series circuit including an ignition coil primary winding and a switching device adapted to be turned on and off, a main circuit, including said series circuit, through which the charge stored in said capacitor is discharged when said switching device is on for producing current through said primary winding, and an oscillation circuit including a series connection of a second capacitor, an inductive reactance and said primary winding for prolonging the duration of current through said primary winding beyond the turning off of said switching device.
Claim 20
Dependent Claim
19 words
An ignition system as in claim 12 including a bidirectional switch in said series connection of said oscillation circuit.
Claim 21
Dependent Claim
37 words
An ignition system as in claim 12 including a second inductive reactance serially connected between said converter and first capacitor and a third capacitor connected in parallel across said first capacitor ahead of said second inductive reactance.
Claim 22
Dependent Claim
23 words
An ignition system as in claim 12 wherein said second capacitor is in said series circuit between said first capacitor and primary winding.
Claim 23
Dependent Claim
27 words
An ignition system as in claim 15 including a second series circuit connected across said inductive reactance and including a third capacitor and a second inductive reactance.
Claim 24
Dependent Claim
46 words
An ignition system as in claim 15 including a second inductive reactance and a third capacitor, said second reactance being connected to the first mentioned reactance in said series connection of said oscillation circuit with said third capacitor being connected to the junction between said reactances.
Claim 25
Dependent Claim
20 words
An ignition system as in claim 12 wherein said second capacitor and reactance are in parallel with said switching element.
Claim 26
Dependent Claim
30 words
An ignition system as in claim 18 and further including a second inductive reactance connected in said series circuit and a third capacitor connected in parallel with said first capacitor.
Claim 27
Dependent Claim
155 words
A capacitor discharge type ignition system comprising: a DC-to-DC converter; at least one first capacitor charged by the output voltage of said DC-to-DC converter; A discharging circuit through which the charge stored in said first capacitor is discharged; said discharging circuit including said first capacitor, a primary winding of an ignition coil, a switching element having a gate, at least one second capacitor and at least one reactor, said discharging circuit including: a circuit through which the charge stored in said first capacitor is supplied via said primary winding to said switching element connected in series with said primary winding, and an oscillation circuit including said primary winding, said reactor and said second capacitor for prolonging the duration of the discharge current flowing through said primary winding even when the gate of said switching element is closed after the charge of said first capacitor has been transferred to said switching element through said primary winding.
Claim 28
Dependent Claim
155 words
A capacitor discharge type ignition system comprising: a DC-to-DC converter; at least one first capacitor charged by the output voltage of said DC-to-DC converter; A discharging circuit through which the charge stored in said first capacitor is discharged; said discharging circuit including said first capacitor, a primary winding of an ignition coil, a switching element having a gate, at least one second capacitor and at least one reactor, said discharging circuit including: a circuit through which the charge stored in said first capacitor is supplied via said primary winding to said switching element connected in series with said primary winding, and an oscillation circuit including said primary winding, said reactor and said second capacitor for prolonging the duration of the discharge current flowing through said primary winding even when the gate of said switching element is closed after the charge of said first capacitor has been transferred to said switching element through said primary winding.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |