US4014309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor discharge type contactless ignition system for internal combustion engines
Assignee: Denso Corp
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Filing: 1974-10-16
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Granted: 1977-03-29
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Expires: 1994-10-16
Abstract
Abstract In the ignition system having a thyristor for performing a switching action, another thyristor is connected to capacitor charging coils in parallel with the thyristor, a primary winding of a transformer is connected in series with the another thyristor, a secondary winding is connected to a gate of the thyristor, and a trigger coil generating an ignition signal and a reversion protecting signal is connected to a gate of the another thyristor. By the transformer and the another thyristor, only the ignition signal is applied to the gate of the thyristor during a normal running of an engine, while only the reversion protecting signal is applied to the gate of the thyristor during a reverse rotation of the engine to prevent a capacitor from being charged thus protecting the reverse rotation.
Inventors
- 👤 Masao Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
F; F02; F02P; F02P11/00; F02P11/02
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
357 words
A capacitor discharge type contactless ignition system for an internal combustion engine comprising: a magneto generator including a stator, a rotor rotated in synchronism with rotation of an engine, a plurality of magnets mounted on and symmetrically disposed about said rotor for rotation therewith, a trigger magnet mounted on said stator, and a trigger core and at least one reversion core disposed adjacent said trigger magnet and rotated in synchronism with the rotation of the engine; capacitor charging coil means mounted on said stator adjacent said rotor for generating alternating current having a first polarity half wave and a second polarity half wave in synchronism with the rotation of an engine in response to passage of said plurality of magnets past said capacitor charging coil means, one of said polarities being positive and the other polarity being negative during rotation produced by normal running of said engine and said one polarity being negative and said other polarity positive during reverse rotation of said engine; capacitor means connected in series with said capacitor charging coil means for storing said first half waves of said alternating current; switching means having a control gate and connected to said capacitor means; an ignition coil having a primary winding connected in series with said capacitor means and said switching means and a secondary winding; a spark plug connected to said secondary winding; trigger coil means mounted on said stator adjacent said trigger magnet for generating reversion protecting signals and ignition signals in response to passage of said trigger and reversion cores past said trigger magnet; and thyristor control means connected to said gate of said switching means, to said capacitor charging coil means and to said trigger coil means for rendering said switching means conductive to complete a discharge path through said ignition coil for discharging said capacitor means in response to said ignition signals and said first half waves during a normal running of said engine and for responding to said reversion protecting signals and said second half waves to cause said switching means to become conductive during a reverse rotation of said engine in order to prevent said reverse rotation.
Claim 2
Dependent Claim
357 words
A capacitor discharge type contactless ignition system for an internal combustion engine comprising: a magneto generator including a stator, a rotor rotated in synchronism with rotation of an engine, a plurality of magnets mounted on and symmetrically disposed about said rotor for rotation therewith, a trigger magnet mounted on said stator, and a trigger core and at least one reversion core disposed adjacent said trigger magnet and rotated in synchronism with the rotation of the engine; capacitor charging coil means mounted on said stator adjacent said rotor for generating alternating current having a first polarity half wave and a second polarity half wave in synchronism with the rotation of an engine in response to passage of said plurality of magnets past said capacitor charging coil means, one of said polarities being positive and the other polarity being negative during rotation produced by normal running of said engine and said one polarity being negative and said other polarity positive during reverse rotation of said engine; capacitor means connected in series with said capacitor charging coil means for storing said first half waves of said alternating current; switching means having a control gate and connected to said capacitor means; an ignition coil having a primary winding connected in series with said capacitor means and said switching means and a secondary winding; a spark plug connected to said secondary winding; trigger coil means mounted on said stator adjacent said trigger magnet for generating reversion protecting signals and ignition signals in response to passage of said trigger and reversion cores past said trigger magnet; and thyristor control means connected to said gate of said switching means, to said capacitor charging coil means and to said trigger coil means for rendering said switching means conductive to complete a discharge path through said ignition coil for discharging said capacitor means in response to said ignition signals and said first half waves during a normal running of said engine and for responding to said reversion protecting signals and said second half waves to cause said switching means to become conductive during a reverse rotation of said engine in order to prevent said reverse rotation.
Claim 3
Dependent Claim
61 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a transformer having a primary winding and a secondary winding connected to the gate of said switching means; and a thyristor having a control gate connected to said trigger coil means, an anode thereof being connected to said primary winding of said transformer.
Claim 4
Dependent Claim
42 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate connected to said trigger coil means and connected to the gate of said switching means at its cathode.
Claim 5
Dependent Claim
39 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a diode connected to said capacitor charging coil means at its cathode and to said trigger coil means at its anode.
Claim 6
Dependent Claim
50 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a transistor connected across said capacitor charging coil means, a base thereof being connected to said trigger coil means and an emitter thereof being connected to the gate of said switching means.
Claim 7
Dependent Claim
43 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate and connnected to said trigger coil means, an anode thereof being connected to the gate of said switching means.
Claim 8
Dependent Claim
61 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate and connected to the gate of said switching means at its anode; and a zener diode connected to said capacitor charging coil means at one end and to the gate of said thyristor at the other end.
Claim 9
Dependent Claim
53 words
A capacitor dishcarge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a bidirectional thyristor having a control gate and connected to said trigger coil means; and a diode connected to said capacitor charging coil means at its cathode and to said control gate at its anode.
Claim 10
Dependent Claim
86 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate connected to said trigger coil means and connected to said switching means at its anode; and a series circuit of a diode and resistor, an anode of said diode being connected to said capacitor charging coil means and a cathode thereof being connected to the gate of said switching means as well as to the anode of said thyristor through said resistor.
Claim 11
Dependent Claim
83 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate connected to said trigger coil means and connected to said switching means at its anode; and a series circuit of a diode and a resistor connected across said capacitor charging coil means, a cathode thereof being connected to said capacitor charging coil means and an anode thereof being connected to the gate of said switching means through said resistor.
Claim 12
Dependent Claim
69 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate connected to said trigger coil means and connected to the gate of said switching means at its cathode; and a transformer having a primary winding connected in series with said capacitor charging coil means and a secondary winding connected to an anode of said thyristor.
Claim 13
Dependent Claim
62 words
A capacitor discharge type contactless ignition system as claimed in claim 1, wherein said thyristor control means comprises; a thyristor having a control gate and connected to said trigger coil means at its anode; and a transformer having a primary winding connected in parallel with said capacitor charging coil means and a secondary winding connected to the control gate of said thyristor.
Claim 14
Dependent Claim
34 words
A system as in claim 1 wherein said reversion core is positioned to produce a reversion protecting signal during reverse rotation at a time where the engine is at its bottom dead center position.
Claim 15
Dependent Claim
39 words
A system as in claim 1 including a plurality of reversion cores symmetrically disposed about said rotor for causing said capacitor means to discharge prior to the transition of said alternating current from negative to positive during reverse rotation.
Claim 16
Dependent Claim
314 words
A capacitor discharge type contactless ignition system for an internal combustion engine comprising; a capacitor charging coil connected to a magneto generator driven by an internal combustion engine for generating alternating current in synchronism with the rotation of said internal combustion engine, said alternating current having positive half waves and negative half waves; a capacitor connected in series with said capacitor charging coil for storing said positive half waves; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor; a spark plug connected to said secondary winding and mounted in said internal combustion engine; a switching means having a control gate and connected to said capacitor, said switching means, said capacitor and said primary winding forming a capacitor discharging circuit; a trigger coil for generating first and second signals in synchronism with said internal combustion engine; and a control circuit connected to said trigger coil, said control gate of said switching means and said capacitor charging coil, said control circuit generating ignition signals in response to said first signals and the positive half waves of the alternating current produced when said internal combustion engine is rotated in a proper direction, said control circuit also generating reversion protecting signals in response to said second signals and the positive half waves of the alternating current produced when said internal combustion engine is rotated in an improper direction, said ignition signals being supplied to said control gate of said switching means to make it conductive, to thereby discharge the stored charge on said capacitor to produce on ignition spark at said spark plug when said internal combustion engine is rotated in said proper direction, said reversion protecting signals being supplied to said control gate of said switching means when said internal combustion engine is rotated in said improper direction in order to bypass said alternating current.
Claim 17
Dependent Claim
314 words
A capacitor discharge type contactless ignition system for an internal combustion engine comprising; a capacitor charging coil connected to a magneto generator driven by an internal combustion engine for generating alternating current in synchronism with the rotation of said internal combustion engine, said alternating current having positive half waves and negative half waves; a capacitor connected in series with said capacitor charging coil for storing said positive half waves; an ignition coil having a primary winding and a secondary winding, said primary winding being connected in series with said capacitor; a spark plug connected to said secondary winding and mounted in said internal combustion engine; a switching means having a control gate and connected to said capacitor, said switching means, said capacitor and said primary winding forming a capacitor discharging circuit; a trigger coil for generating first and second signals in synchronism with said internal combustion engine; and a control circuit connected to said trigger coil, said control gate of said switching means and said capacitor charging coil, said control circuit generating ignition signals in response to said first signals and the positive half waves of the alternating current produced when said internal combustion engine is rotated in a proper direction, said control circuit also generating reversion protecting signals in response to said second signals and the positive half waves of the alternating current produced when said internal combustion engine is rotated in an improper direction, said ignition signals being supplied to said control gate of said switching means to make it conductive, to thereby discharge the stored charge on said capacitor to produce on ignition spark at said spark plug when said internal combustion engine is rotated in said proper direction, said reversion protecting signals being supplied to said control gate of said switching means when said internal combustion engine is rotated in said improper direction in order to bypass said alternating current.
Claim 18
Dependent Claim
68 words
A capacitor discharge type contactless ignition system as set forth in claim 15, wherein said control circuit comprises; a transformer having a primary coil and a secondary coil connected to the control gate of said switching means; and a thyristor having a control gate connected to said trigger coil, the anode-cathode path of said thyristor and said primary coil being connected in parallel with said capacitor charging coil.
Claim 19
Dependent Claim
50 words
A capacitor discharge type contactless ignition system as set forth in claim 15, wherein said control circuit comprises; a thyristor having a control gate connected to said trigger coil, the anode-cathode path of said thyristor being connected between said capacitor charging coil and said control gate of said switching means.
Claim 20
Dependent Claim
47 words
A capacitor discharge type contacless ignition system as set forth in claim 15, wherein said control circuit comprises; a diode means connected to said capacitor charging coil at its cathode, the anode thereof being connected to said trigger coil and said control gate of said switching means.
Claim 21
Dependent Claim
70 words
A capacitor discharge type contactless ignition system as set forth in claim 15, wherein said control circuit comprises; a series circuit of a diode and a resistor so connected across said capacitor charging coil as to let the negative half waves flow therethrough; and a bidirectional thyristor having a control gate connected to said series circuit, and connected to said trigger coil and the control gate of said switching means.
Claim 22
Dependent Claim
79 words
A capacitor discharge type contactless ignition system as set forth in claim 15, wherein said control circuit comprises; a series circuit of a diode, a resistor and an anode-cathode path of a thyristor connected across said capacitor charging coil, said control gate of said switching means being connected to said series circuit, the control gate of said thyristor being connected to said trigger coil, and said anode-cathode path of said thyristor being connected in series with said switching means.
Claim 23
Dependent Claim
70 words
A capacitor discharge type contactless ignition system as set forth in claim 15, wherein said control circuit comprises; a transformer having a primary coil and a secondary coil, said primary coil being connected in series with said capacitor charging circuit; and a thyristor having a control gate connected to said trigger coil, the anode-cathode path thereof being connected between said secondary coil and said control gate of said switching means.
Claim 24
Dependent Claim
69 words
A capacitor discharge type contactless ignition system as set forth in claim 15, wherein said control circuit comprises; a transformer having a primary coil and a secondary coil; a diode connected across said capacitor charging coil through said primary coil; and a thyristor having a control gate connected to said secondary coil, the anode thereof being connected to said trigger coil and the control gate of said switching means.
Claim 25
Dependent Claim
199 words
A capacitor discharge type contactless ignition system for an internal combustion engine comprising; means for generating alternating current in synchronism with a rotation of an internal combustion engine, said alternating current having positive and negative half waves; means for storing said positive half waves; means for generating first and second signals in synchronism with the rotation of said internal combustion engine; means for generating ignition signals in response to said alternating current and said first signals when said internal combustion engine is rotated in a proper direction, and for generating reversion protecting signals in response to said alternating current and said second signals when said internal combustion engine is rotated in an improper direction; means for discharging the stored charge of said positive half waves in response to said ignition signals when said internal combustion engine is rotated in said proper direction and for bypassing said alternating current in response to said reversion protecting signals when said internal combustion engine is rotated in said improper direction; and means for producing ignition sparks when said stored charges of said positive half waves are discharged, to thereby cause the rotation of said internal combustion engine to proceed in said proper direction.
Claim 26
Dependent Claim
199 words
A capacitor discharge type contactless ignition system for an internal combustion engine comprising; means for generating alternating current in synchronism with a rotation of an internal combustion engine, said alternating current having positive and negative half waves; means for storing said positive half waves; means for generating first and second signals in synchronism with the rotation of said internal combustion engine; means for generating ignition signals in response to said alternating current and said first signals when said internal combustion engine is rotated in a proper direction, and for generating reversion protecting signals in response to said alternating current and said second signals when said internal combustion engine is rotated in an improper direction; means for discharging the stored charge of said positive half waves in response to said ignition signals when said internal combustion engine is rotated in said proper direction and for bypassing said alternating current in response to said reversion protecting signals when said internal combustion engine is rotated in said improper direction; and means for producing ignition sparks when said stored charges of said positive half waves are discharged, to thereby cause the rotation of said internal combustion engine to proceed in said proper direction.
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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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |