Patent US3875915A successfully refreshed from Google Patents.
US3875915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor discharge ignition system with overspeed control
Assignee: Outboard Marine Corp
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Filing: 1973-09-27
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Granted: 1975-04-08
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Expires: 1993-09-27
Abstract
Abstract Disclosed herein is a capacitor discharge ignition circuit with engine overspeed control comprising an engine ignition subcircuit electrically connected to a capacitor and including a primary winding and a normal nonconductive electronic ignition switch connected in series with the primary winding and including a trigger element operative to close the ignition switch ahd thereby to discharge the capacitor through the ignition subcircuit to effect spark production, together with a speed control sub-circuit connected to the capacitor in parallel with the ignition sub-circuit and including resistor means and a normally nonconductive electronic speed control switch connected in series with the resistor means and including a control element operative to close the speed control switch and thereby to discharge the capacitor through the speed control sub-circuit during a time interval determined by the resistor means and independent of engine rotation, and coil and magnet means rotatable relative to each other in accordance with engine speed and electrically connected to the capacitor, to the control element, and to the trigger element for sequentially charging the capacitor with a speed control charge, generating a speed control pulse and applying the speed control pulse to the control element, charging the capacitor with an ignition charge, and generating a trigger pulse and applying the trigger pulse to the trigger element.
Inventors
- 👤 Phillip A Anderson
- 👤 Donald H Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:56
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
448 words
In an internal combustion engine, a capacitor discharge ignition circuit with engine overspeed control comprising a charge capacitor, a spark plug, an ignition coil including a secondary winding electrically connected to said spark plug and a primary winding, an engine ignition sub-circuit electrically connected to said capacitor and including said primary winding and a normally nonconductive electronic ignition switch connected in series with said primary winding and including a trigger element operative to close said ignition switch and thereby to discharge said capacitor through said ignition sub-circuit to effect spark production, means connected to said capacitor and including a first charge magnet for charging said capacitor with an ignition charge prior to spark-producing operation of said ignition sub-circuit, means connected to said trigger element for generating a trigger pulse after charging of said capacitor with said ignition charge, and for applying said trigger pulse to said trigger element to effect closure of said ignition switch, whereby to effect spark production in response to discharge of said ignition charge from said capacitor through said ignition sub-circuit, and means for preventing spark-producing operation of said ignition sub-circuit in the event of engine rotation above a predetermined speed comprising a speed control sub-circuit connected to said capacitor in parallel with said ignition sub-circuit and including resistor means and a normally nonconductive electronic speed control switch connected in series with said resistor means and including a control element operative to close said speed control switch and thereby to discharge said capacitor through said speed control sub-circuit, means connected to said capacitor and including a second charge magnet for charging said capacitor with a speed control charge during the interval between generation of speed trigger pulse and charging of said capacitor with said ignition charge, and means connected to said control element for generating a speed control pulse during the interval between charging of said capacitor with said speed control charge and charging of said capacitor with said ignition charge and for applying said speed control pulse to said control element to effect closure of said speed control switch whereby, when the engine rotates above the predetermined speed, the time interval between generation of said speed control pulse and charging of said capacitor with said ignition charge is less than the time interval of discharge of said speed control charge from said capacitor through said speed control sub-circuit, whereby said speed control switch is conductive at the time of charging of said capacitor with said ignition charge, and whereby said ignition charge is immediately discharged through said speed control sub-circuit to prevent subsequent discharge of said ignition charge through said ignition sub-circuit in response to the next generation of said ignition trigger pulse.
Claim 2
Dependent Claim
448 words
In an internal combustion engine, a capacitor discharge ignition circuit with engine overspeed control comprising a charge capacitor, a spark plug, an ignition coil including a secondary winding electrically connected to said spark plug and a primary winding, an engine ignition sub-circuit electrically connected to said capacitor and including said primary winding and a normally nonconductive electronic ignition switch connected in series with said primary winding and including a trigger element operative to close said ignition switch and thereby to discharge said capacitor through said ignition sub-circuit to effect spark production, means connected to said capacitor and including a first charge magnet for charging said capacitor with an ignition charge prior to spark-producing operation of said ignition sub-circuit, means connected to said trigger element for generating a trigger pulse after charging of said capacitor with said ignition charge, and for applying said trigger pulse to said trigger element to effect closure of said ignition switch, whereby to effect spark production in response to discharge of said ignition charge from said capacitor through said ignition sub-circuit, and means for preventing spark-producing operation of said ignition sub-circuit in the event of engine rotation above a predetermined speed comprising a speed control sub-circuit connected to said capacitor in parallel with said ignition sub-circuit and including resistor means and a normally nonconductive electronic speed control switch connected in series with said resistor means and including a control element operative to close said speed control switch and thereby to discharge said capacitor through said speed control sub-circuit, means connected to said capacitor and including a second charge magnet for charging said capacitor with a speed control charge during the interval between generation of speed trigger pulse and charging of said capacitor with said ignition charge, and means connected to said control element for generating a speed control pulse during the interval between charging of said capacitor with said speed control charge and charging of said capacitor with said ignition charge and for applying said speed control pulse to said control element to effect closure of said speed control switch whereby, when the engine rotates above the predetermined speed, the time interval between generation of said speed control pulse and charging of said capacitor with said ignition charge is less than the time interval of discharge of said speed control charge from said capacitor through said speed control sub-circuit, whereby said speed control switch is conductive at the time of charging of said capacitor with said ignition charge, and whereby said ignition charge is immediately discharged through said speed control sub-circuit to prevent subsequent discharge of said ignition charge through said ignition sub-circuit in response to the next generation of said ignition trigger pulse.
Claim 3
Dependent Claim
16 words
An ignition circuit in accordance with claim 1 wherein said speed control switch is an SCR.
Claim 4
Dependent Claim
33 words
An ignition circuit in accordance with claim 1 wherein said resistor means includes a resistance operable to control the time interval of discharge of said speed control charge through said speed control sub-circuit.
Claim 5
Dependent Claim
42 words
An ignition circuit in accordance with claim 1 wherein said means for generating said trigger pulse and said speed control pulse comprise a single trigger coil including one end connected to said trigger element and one end connected to said control element.
Claim 6
Dependent Claim
70 words
An ignition circuit in accordance with claim 4 wherein said means for generating said trigger pulse and said speed control pulse comprise a pulse magnet rotating in accordance with engine speed and including an arcuately extending north pole surface and an arcuately extending south pole surface spaced from said north pole surface, the sum of the arcuate extent of said north and south pole surfaces being slightly less than 360.degree..
Claim 7
Dependent Claim
107 words
An ignition circuit in accordance with claim 1 wherein said means for generating said trigger pulse and said speed control pulse comprise a pulse magnet which rotates in accordance with engine speed and includes an arcuately extending north pole surface and an arcuately extending south pole surface spaced from said north pole surface, a core located adjacent to the path of said surfaces, and a single trigger coil wound on said core and including one end connected to said trigger element and one end connected to said control element, whereby said trigger pulse is of one polarity and said speed control pulse is of the other polarity.
Claim 8
Dependent Claim
52 words
An ignition circuit in accordance with claim 1 wherein said means for charging said capacitor with said speed control charge and with said ignition charge include a charge coil connected to said capacitor and means for rectifying the voltage generated in said charge coil in response to passage of said charge magnets.
Claim 9
Dependent Claim
167 words
A capacitor discharge ignition circuit in accordance with claim 1 wherein said means for charging said capacitor with said speed control charge and with said ignition charge includes a charge coil connected to said capacitor and wherein said means for generating said trigger pulse and said speed control pulse comprise a pulse magnet including a north pole surface and a south pole surface spaced from said north pole surface, and a single trigger coil including one end connected to said trigger element and one end connected to said control element, and wherein said first and second charge magnets and said north and south pole surfaces rotate in accordance with engine speed, and wherein said first and second charge magnets, said charge coil, said north and south pole surfaces, and said trigger coil are located relative to each other so as to successively charge said capacitor with said speed control charge, generate said speed control pulse, charge said capacitor with said ignition charge, and generate said trigger pulse.
Claim 10
Dependent Claim
339 words
In an internal combustion engine, a capacitor discharge ignition circuit with engine overspeed control comprising a charge capacitor, a spark plug, an ignition assembly including a secondary winding electrically connected to said spark plug and a primary winding, an engine ignition sub-circuit electrically connected to said capacitor and including said primary winding and a normally nonconductive electronic ignition switch connected in series with said primary winding and including a trigger element operative to close said ignition switch and thereby to discharge said capacitor through said ignition sub-circuit to effect spark production, a speed control sub-circuit connected to said capacitor in parallel with said ignition sub-circuit and including resistor means and a normally nonconductive electronic speed control switch connected in series with said resistor means and including a control element operative to close said speed control switch and thereby to discharge said capacitor through said speed control sub-circuit during a time interval determined by said resistor means and independent of engine rotation, and coil and magnet means rotatable relative to each other in accordance with engine speed and electrically connected to said capacitor, to said control element, and to said trigger element for sequentially charging said capacitor with a speed control charge, generating a speed control pulse and applying said speed control pulse to said control element, charging said capacitor with an ignition charge, and generating a trigger pulse and applying said trigger pulse to said trigger element, whereby, when the engine rotates above a predetermined speed, the time interval between generation of said speed control pulse and charging of said capacitor with said ignition charge is less than the time interval of discharge of said speed control charge from said capacitor through said speed control sub-circuit, whereby said speed control switch is conductive at the time of charging of said capacitor with said ignition charge, and whereby said ignition charge is immediately discharged through said speed control sub-circuit to prevent subsequent discharge of said ignition charge through said ignition sub-circuit in response to generation of said ignition trigger pulse.
Claim 11
Dependent Claim
339 words
In an internal combustion engine, a capacitor discharge ignition circuit with engine overspeed control comprising a charge capacitor, a spark plug, an ignition assembly including a secondary winding electrically connected to said spark plug and a primary winding, an engine ignition sub-circuit electrically connected to said capacitor and including said primary winding and a normally nonconductive electronic ignition switch connected in series with said primary winding and including a trigger element operative to close said ignition switch and thereby to discharge said capacitor through said ignition sub-circuit to effect spark production, a speed control sub-circuit connected to said capacitor in parallel with said ignition sub-circuit and including resistor means and a normally nonconductive electronic speed control switch connected in series with said resistor means and including a control element operative to close said speed control switch and thereby to discharge said capacitor through said speed control sub-circuit during a time interval determined by said resistor means and independent of engine rotation, and coil and magnet means rotatable relative to each other in accordance with engine speed and electrically connected to said capacitor, to said control element, and to said trigger element for sequentially charging said capacitor with a speed control charge, generating a speed control pulse and applying said speed control pulse to said control element, charging said capacitor with an ignition charge, and generating a trigger pulse and applying said trigger pulse to said trigger element, whereby, when the engine rotates above a predetermined speed, the time interval between generation of said speed control pulse and charging of said capacitor with said ignition charge is less than the time interval of discharge of said speed control charge from said capacitor through said speed control sub-circuit, whereby said speed control switch is conductive at the time of charging of said capacitor with said ignition charge, and whereby said ignition charge is immediately discharged through said speed control sub-circuit to prevent subsequent discharge of said ignition charge through said ignition sub-circuit in response to generation of said ignition trigger pulse.
References Cited (Backward Citations)
US3581720A
Cited
US3703889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |