US4619241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-energy ignition device
Assignee: Hitachi Ltd
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Filing: 1984-09-07
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Granted: 1986-10-28
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Expires: 2004-09-07
Abstract
Abstract An high-energy ignition device having an igniter coil adapted to produce a high voltage for allowing an electric discharge between electrodes of a sparking plug in accordance with the output from an ignition circuit, and a DC-DC converter adapted to produce a voltage high enough to maintain the electric discharge in the sparking plug. The DC-DC converter is connected such that the output thereof is superposed to the discharge current produced by the igniter coil. The igniter coil and the transformer of the DC-DC converter are integrated with a forming resin. Consequently, the electrical insulation between the parts is improved and the mounting of the ignition device on vehicles is facilitated.
Inventors
- 👤 Takashi Yoshinari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:02
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
292 words
A high-energy ignition device for an engine, the high energy ignition device comprising: a pickup for generating an output synchronous with operations of the engine; an ignition circuit including a switching device adapted to be turned on and off in accordance with the output from said pickup; an igniter coil including a primary coil connected to said switching device, a secondary coil in which a high voltage is generated in response to an abrupt turning on and off of electric current in said primary coil, and an iron core between said primary and secondary coils; and a DC-DC converter including a transformer including by a primary coil, a secondary coil and an iron core between said primary and secondary coils, a switching element connected in series to said primary coil, and an oscillator for turning said switching element on and off at a predetermined frequency, said DC-DC converter being adapted to produce, at the output side of said secondary coil, a DC voltage lower than the pulse voltage generated by said igniter coil and adapted to be superposed on the current produced by said igniter coil; said igniter coil, said output transformer of said DC-DC converter, a first line connected between one end of said secondary coil of said output transformer and ground, a diode having a cathode connected to the other end of said secondary coil of said transformer, a smoothing capacitor one end of which is connected to an anode of said diode, a second line connected between the other end of said capacitor and ground, and a third line connected between said anode of said diode and one end of said secondary coil of said igniter coil, are integrated with a forming resin for facilitating a sufficiently strong insulation.
Claim 2
Dependent Claim
292 words
A high-energy ignition device for an engine, the high energy ignition device comprising: a pickup for generating an output synchronous with operations of the engine; an ignition circuit including a switching device adapted to be turned on and off in accordance with the output from said pickup; an igniter coil including a primary coil connected to said switching device, a secondary coil in which a high voltage is generated in response to an abrupt turning on and off of electric current in said primary coil, and an iron core between said primary and secondary coils; and a DC-DC converter including a transformer including by a primary coil, a secondary coil and an iron core between said primary and secondary coils, a switching element connected in series to said primary coil, and an oscillator for turning said switching element on and off at a predetermined frequency, said DC-DC converter being adapted to produce, at the output side of said secondary coil, a DC voltage lower than the pulse voltage generated by said igniter coil and adapted to be superposed on the current produced by said igniter coil; said igniter coil, said output transformer of said DC-DC converter, a first line connected between one end of said secondary coil of said output transformer and ground, a diode having a cathode connected to the other end of said secondary coil of said transformer, a smoothing capacitor one end of which is connected to an anode of said diode, a second line connected between the other end of said capacitor and ground, and a third line connected between said anode of said diode and one end of said secondary coil of said igniter coil, are integrated with a forming resin for facilitating a sufficiently strong insulation.
Claim 3
Dependent Claim
30 words
A high-energy ignition device according to claim 1, wherein an aluminum case accommodating said oscillator and said switching transistor is fixed to said igniter coil and said output transformer unit.
Claim 4
Dependent Claim
18 words
A high-energy ignition device according to claim 2, wherein said aluminum case is provided with heat radiating fins.
Claim 5
Dependent Claim
217 words
A high-energy ignition device comprising: a pickup for generating an output synchronous with engine operation; an ignition circuit including a switching device adapted to be turned on and off in accordance with the output from said pickup; an igniter coil including a primary coil connected to said switching device, a secondary coil in which a high voltage is generated in response to an abrupt turning on and off of electric current in said primary coil, and an iron core between said primary and secondary coils; and a DC-DC converter including a transformer constituted by a primary coil, a secondary coil and an iron core between said primary and secondary coils, a switching element connected in series to said primary coil, and an oscillator for turning said switching element on and off at a predetermined frequency, said DC-DC converter being adapted to produce, at the output side of said secondary coil, a DC voltage lower than the pulse voltage generated by said igniter coil and adapted to be superposed on the current produced by said igniter coil; said igniter coil and said output transformer of said DC-DC converter, are integrated with a forming resin, wherein lines connecting the secondary coil of said output transformer to the output terminal of said igniter coil are embedded in said forming resin.
Claim 6
Dependent Claim
217 words
A high-energy ignition device comprising: a pickup for generating an output synchronous with engine operation; an ignition circuit including a switching device adapted to be turned on and off in accordance with the output from said pickup; an igniter coil including a primary coil connected to said switching device, a secondary coil in which a high voltage is generated in response to an abrupt turning on and off of electric current in said primary coil, and an iron core between said primary and secondary coils; and a DC-DC converter including a transformer constituted by a primary coil, a secondary coil and an iron core between said primary and secondary coils, a switching element connected in series to said primary coil, and an oscillator for turning said switching element on and off at a predetermined frequency, said DC-DC converter being adapted to produce, at the output side of said secondary coil, a DC voltage lower than the pulse voltage generated by said igniter coil and adapted to be superposed on the current produced by said igniter coil; said igniter coil and said output transformer of said DC-DC converter, are integrated with a forming resin, wherein lines connecting the secondary coil of said output transformer to the output terminal of said igniter coil are embedded in said forming resin.
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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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |