US3741185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor discharge ignition system
Assignee: Prestolite Electric Inc
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Filing: 1971-07-06
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Granted: 1973-06-26
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Expires: 1991-07-06
Abstract
Abstract A flywheel alternator with permanent magnet energization is disclosed for general power purposes which has combined with it charging means for a capacitor or capacitors for a capacitordischarge distributor-less ignition circuit or circuits suitable for use with single or multiple cylinder engines, wherein separate trigger coils are energized by a separate permanent magnet rotated with the flywheel to control the timing in the ignition circuit or circuits. The separate permanent magnet energizing the trigger coil or coils is provided with an automatic ignition advance device, which changes the ignition timing in accordance with variations in speed.
Inventors
- 👤 T Swift
- 👤 E Brayley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:52
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/03
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
268 words
In a capacitor-discharge ignition system for a multiplecylinder internal combustion engine, a part rotated by the engine to create a varying magnetic field, an ignition circuit for each cylinder including a capacitor, a thyristor, a high-voltage coil and a spark plug fired by the high-voltage coil, a low-speed charging winding activated by the varying magnetic field for the capacitor with a control, a high-speed charging winding activated by the varying magnetic field for the capacitor in parallel therewith, said control changing the effect of the low-speed charging winding at a predetermined speed of the engine, said control including a step-up transformer having its secondary operatively connected to said capacitor and its primary connected in series to said low speed charging winding through an electronic switch, said switch being biased in its conductive state when said engine speed is below said predetermined speed, and a voltage responsive device operatively connected to said low speed winding and said electronic switch and effective to cause said switch to assume its non-conductive state to open circuit said primary of said step-up transformer when said engine speed reaches said predetermined speed, thereby effectively changing the effect of said low-speed charging winding, a timing gate control means for the thyristor to discharge the capacitor through the primary of the high-voltage coil to cause firing of the spark plug, the timing gate control means including a timing coil to create a timing pulse activated by a second varying magnetic field cooperating with the rotating part and an amplifier for increasing the energy of the timing pulse and to peak the same to fire the thyristor.
Claim 2
Dependent Claim
268 words
In a capacitor-discharge ignition system for a multiplecylinder internal combustion engine, a part rotated by the engine to create a varying magnetic field, an ignition circuit for each cylinder including a capacitor, a thyristor, a high-voltage coil and a spark plug fired by the high-voltage coil, a low-speed charging winding activated by the varying magnetic field for the capacitor with a control, a high-speed charging winding activated by the varying magnetic field for the capacitor in parallel therewith, said control changing the effect of the low-speed charging winding at a predetermined speed of the engine, said control including a step-up transformer having its secondary operatively connected to said capacitor and its primary connected in series to said low speed charging winding through an electronic switch, said switch being biased in its conductive state when said engine speed is below said predetermined speed, and a voltage responsive device operatively connected to said low speed winding and said electronic switch and effective to cause said switch to assume its non-conductive state to open circuit said primary of said step-up transformer when said engine speed reaches said predetermined speed, thereby effectively changing the effect of said low-speed charging winding, a timing gate control means for the thyristor to discharge the capacitor through the primary of the high-voltage coil to cause firing of the spark plug, the timing gate control means including a timing coil to create a timing pulse activated by a second varying magnetic field cooperating with the rotating part and an amplifier for increasing the energy of the timing pulse and to peak the same to fire the thyristor.
Claim 3
Dependent Claim
29 words
The ignition circuit defined in claim 1 further characterized by the amplifier including a regenerative circuit which augments the energy of the timing pulse and controls its time duration.
Claim 4
Dependent Claim
26 words
The ignition circuit defined in claim 1 further characterized by the amplifier including a transformer and a transistor which obtains operating energy from the charging coils.
Claim 5
Dependent Claim
33 words
The ignition circuit defined in claim 3 wherein the base of the transistor is in circuit with a secondary of the transformer and a capacitor to create a regenerative action on the transistor.
Claim 6
Dependent Claim
95 words
The capacitor discharge ignition circuit of claim 1 wherein said voltage responsive device includes a zener diode and a second controlled conduction device operatively connected to said low speed charging winding and to the control electrode of said electronic switch such that the output voltage from said low speed winding, when said engine speed reaches said predetermined value, is effective to cause said second controlled conduction device to conduct, thereby shunting the control electrode of said electronic switch to cause it to assume its non-conductive state to open circuit said primary of said step-up transformer.
Claim 7
Dependent Claim
27 words
The capacitor discharge ignition circuit of claim 1 wherein said low speed charging winding is also operatively connected to a battery in parallel relation to said capacitor.
Claim 8
Dependent Claim
224 words
In a capacitor discharge ignition circuit including a capacitor and a controlled conduction device operatively connected to a spark device and a trigger device responsive to engine speed operatively connected to said controlled discharge device to cause said controlled conduction device to discharge said capacitor to said spark device on timed relation to engine speed, the improvement comprising a first and a second charging winding operatively connected to said capacitor, said first charging winding having a relatively low voltage output connected to said capacitor through a step-up transformer and said second charging winding haVing a relatively high voltage output connected directly to said capacitor, and means for effectively preventing said first charging winding from charging said capacitor at speeds above a predetermined engine speed, said last name means including an electronic switch operatively connected in circuit with said first charging winding and the primary of said step-up transformer and biased in its conductive state when said engine speed is below said predetermined engine speed, a voltage responsive device operatively connected to said first charging winding and said electronic switch and effective to cause said switch to assume its non-conductive state to open circuit said primary of said step-up transformer when said engine reaches said predetermined speed, thereby effectively preventing said first charging winding from charging said capacitor at speeds above said predetermined engine speed.
Claim 9
Dependent Claim
224 words
In a capacitor discharge ignition circuit including a capacitor and a controlled conduction device operatively connected to a spark device and a trigger device responsive to engine speed operatively connected to said controlled discharge device to cause said controlled conduction device to discharge said capacitor to said spark device on timed relation to engine speed, the improvement comprising a first and a second charging winding operatively connected to said capacitor, said first charging winding having a relatively low voltage output connected to said capacitor through a step-up transformer and said second charging winding haVing a relatively high voltage output connected directly to said capacitor, and means for effectively preventing said first charging winding from charging said capacitor at speeds above a predetermined engine speed, said last name means including an electronic switch operatively connected in circuit with said first charging winding and the primary of said step-up transformer and biased in its conductive state when said engine speed is below said predetermined engine speed, a voltage responsive device operatively connected to said first charging winding and said electronic switch and effective to cause said switch to assume its non-conductive state to open circuit said primary of said step-up transformer when said engine reaches said predetermined speed, thereby effectively preventing said first charging winding from charging said capacitor at speeds above said predetermined engine speed.
Claim 10
Dependent Claim
93 words
The capacitor discharge ignition circuit of claim 7 wherein said voltage responsive device includes a zener diode and a second controlled conduction device operatively connected to said first charging winding and to the control electrode of said electronic switch such that the output voltage from said first winding, when said engine speed reaches said predetermined value, is effective to cause said second controlled conduction device to conduct, thereby shunting the control electrode of said electronic switch to cause it to assume its non-conductive state to open circuit said primary of said step-up transformer.
Claim 11
Dependent Claim
26 words
The capacitor discharge ignition circuit of claim 7 wherein said first charging winding is also operatively connected to a battery in parallel relation to said capacitor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |