US3584929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark duration for capacitor discharge ignition systems
Assignee: Motorola Solutions Inc
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Filing: 1969-12-29
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Granted: 1971-06-15
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Expires: 1989-12-29
Abstract
Abstract A capacitor discharge ignition system wherein an energy storage capacitor is charged to a relatively high voltage and synchronously discharged into the primary winding of an ignition coil to develop a high-energy short-time duration spark discharge at the secondary winding of the ignition coil, and a circuit is provided for increasing the time duration of the spark discharge beyond that normally obtained from the capacitor discharge system to improve the fuel-igniting properties of the spark.
Inventors
- 👤 Gunter G Schuette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:12
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
236 words
A capacitor discharge ignition system for generating sparkproducing potentials at the primary winding of an ignition coil so that a spark discharge is produced between electrodes connected to the secondary winding thereof, comprising: an energy storage capacitor for receiving and storing a highvoltage electrical energy pulse; an energy supply circuit coupled to said energy storage capacitor for delivering thereto a high-voltage electrical energy pulse substantially immediately after a previous energy pulse has been discharged therefrom and applied to the primary winding of the ignition coil; control-switching means connected to said energy storage capacitor and arranged for connection to the primary winding of the ignition coil; external pulse signal information means coupled to said controlswitching means to render the same conductive in response thereto substantially instantaneously to discharge said energy storage capacitor into the primary winding of the ignition coil within a relatively short predetermined time interval to initiate a spark discharge between the electrode connected to the secondary winding; and means connected in circuit with said control-switching means and arranged for connection to the primary winding of the ignition coil, said means being substantially immediately responsive to the discharge of said energy storage capacitor to extend the duration of current flow through the primary winding of the ignition coil beyond that of said relatively short predetermined time interval to increase the duration of the spark discharge produced between the electrodes connected to the secondary winding thereof.
Claim 2
Dependent Claim
236 words
A capacitor discharge ignition system for generating sparkproducing potentials at the primary winding of an ignition coil so that a spark discharge is produced between electrodes connected to the secondary winding thereof, comprising: an energy storage capacitor for receiving and storing a highvoltage electrical energy pulse; an energy supply circuit coupled to said energy storage capacitor for delivering thereto a high-voltage electrical energy pulse substantially immediately after a previous energy pulse has been discharged therefrom and applied to the primary winding of the ignition coil; control-switching means connected to said energy storage capacitor and arranged for connection to the primary winding of the ignition coil; external pulse signal information means coupled to said controlswitching means to render the same conductive in response thereto substantially instantaneously to discharge said energy storage capacitor into the primary winding of the ignition coil within a relatively short predetermined time interval to initiate a spark discharge between the electrode connected to the secondary winding; and means connected in circuit with said control-switching means and arranged for connection to the primary winding of the ignition coil, said means being substantially immediately responsive to the discharge of said energy storage capacitor to extend the duration of current flow through the primary winding of the ignition coil beyond that of said relatively short predetermined time interval to increase the duration of the spark discharge produced between the electrodes connected to the secondary winding thereof.
Claim 3
Dependent Claim
31 words
The capacitor discharge ignition system of claim 1 wherein said means is an inductance element connected in series between said control switching means and the primary winding of the ignition coil.
Claim 4
Dependent Claim
82 words
The capacitor discharge ignition system of claim 1 wherein said means is an inductance element connected in series with said control-switching means and the primary winding of the ignition coil, said inductance element having an inductance value such that when added to the inductance value of the primary winding ignition coil as provided during the spark discharge at the secondary winding thereof provides an inductive reactance substantially equal to the capacitive reactance provided by said energy storage capacitor for a given frequency.
Claim 5
Dependent Claim
111 words
The capacitor discharge ignition system of a 1 wherein said means includes a current control device connected in circuit with the primary winding of the ignition coil, said current control device being rendered conductive upon discharge of said energy storage capacitor into the primary winding of the ignition coil to supply added current flow through the winding winding after a spark discharge ignition been established between the electrodes connected to the secondary winding of the ignition coil, said additional current flow continuing for a predetermined period of time to extend the time duration of the spark discharge between the electrodes beyond that normally obtained from a conventional capacitor discharge ignition system.
Claim 6
Dependent Claim
111 words
The capacitor discharge ignition system of a 1 wherein said means includes a current control device connected in circuit with the primary winding of the ignition coil, said current control device being rendered conductive upon discharge of said energy storage capacitor into the primary winding of the ignition coil to supply added current flow through the winding winding after a spark discharge ignition been established between the electrodes connected to the secondary winding of the ignition coil, said additional current flow continuing for a predetermined period of time to extend the time duration of the spark discharge between the electrodes beyond that normally obtained from a conventional capacitor discharge ignition system.
Claim 7
Dependent Claim
31 words
The capacitor discharge ignition system of claim 4 wherein said current control device is a silicon-controlled rectifier which is rendered conduCtive in response to the discharge of said energy storage capacitor.
Claim 8
Dependent Claim
50 words
The capacitor discharge ignition system of claim 5 wherein said silicon-controlled rectifier has its gate electrode connected to its anode by a resistance element having a resistance value to cause conduction of the silicon-controlled rectifier at a preselected point in time at which said energy storage capacitor is substantially discharged.
Claim 9
Dependent Claim
130 words
The capacitor discharge ignition system of claim 1 wherein said energy supply circuit includes a single swing-blocking oscillator having a step-up transformer, the primary winding of said step-up transformer being connected to a power transistor which is rendered conductive upon sensing the discharge of said energy storage capacitor to apply a subsequent pulse of energy to said energy storage capacitor, and said means includes a silicon-controlled rectifier connected between said power transitor and the primary winding of the ignition coil to apply additional current through the primary winding substantially immediately following the discharge of said energy storage capacitor and during an established spark discharge between the electrodes connected to the secondary winding of the ignition coil, said additional current flow causing an increase in the spark duration between the electrodes.
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |