US3911889A - Capacitor discharge type contactless ignition system for internal combustion engines - Google Patents

Capacitor discharge type contactless ignition system for internal combustion engines Download PDF

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Publication number
US3911889A
US3911889A US452360A US45236074A US3911889A US 3911889 A US3911889 A US 3911889A US 452360 A US452360 A US 452360A US 45236074 A US45236074 A US 45236074A US 3911889 A US3911889 A US 3911889A
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United States
Prior art keywords
capacitor
charging coil
generated
half wave
capacitor charging
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US452360A
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English (en)
Inventor
Masao Nagasawa
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Denso Corp
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NipponDenso Co Ltd
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Filing date
Publication date
Priority claimed from JP1973038583U external-priority patent/JPS5326494Y2/ja
Priority claimed from JP5420573U external-priority patent/JPS5319315Y2/ja
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Application granted granted Critical
Publication of US3911889A publication Critical patent/US3911889A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P11/00—Safety means for electric spark ignition, not otherwise provided for
    • F02P11/02—Preventing damage to engines or engine-driven gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
    • F02P1/08—Layout of circuits
    • F02P1/086—Layout of circuits for generating sparks by discharging a capacitor into a coil circuit

Definitions

  • the ignition system is provided at least two coils for generating voltages with phase different from each other. One of the coils charges a capacitor and the other mainly generates an electric signal for preventing reverse rotation. During the reverse rotation of the engine, said other coil so operates as to let the capacitor charging current flow not to the capacitor but to the ground, thereby preventing ignition sparks.
  • the present invention relates in general to a capacitor discharge type ignition system for internal combustion engines in which a magneto generator is employed as an electric power source for charging a capacitor, and especially to the system for preventing the engines from rotating in the reverse direction.
  • a primary object of the present invention to provide a capacitor discharge type ignition system employing the conventional magneto generator which has a plurality of magnets spaced apart at equal intervals.
  • FIGS. 1, 4, 5, 7, 8, 10, ll, 13, 17, 19, 21 and 24 are respectively electric wiring diagrams of first to twelth embodiments of the present invention.
  • FIG. 2 shows a partially transverse sectional view of an internal rotor type magneto generator employed in the first embodiments of the present invention
  • FIGS. 3, 6, 9, 12 and 20 are wavefrom diagrams for explaining the operation of the embodiments.
  • FIG. 14 is transverse sectional view of an external revolving type magneto generator employed in the seventh and eighth embodiments of the present invention.
  • FIG. 15 shows another external revolving type magneto generator, in which FIG. l5-A is a perspective view of the stator of the magneto generator'and FIG. 15-B is a rough plan view thereof;
  • FIG. 16 shows an external revolving type magneto generator employed in the third and fourth embodiments of the present invention, in which FIG. l6-A is a plan view of the stator of the magneto generator and FIG. 16-8 is an elevational view thereof;
  • FIG. 18 shows an external revolving type magneto generator employed in the ninth embodiment of the present invention, in which FIG. 18-A is a longitudinal sectional view taken along the line XVIIIA-XVIIIA in FIG. l8-B and FIG. l8-B is a transverse sectional view taken along the line XVIIIB-XVIIIB in FIG. 18-A;
  • FIG. 22 shows another external revolving type magneto generator employed in the ninth embodiment of the present invention, in which FIG. 22-A is transverse sectional view taken along the line XXIIA-XXIIA in FIG. 22-B and FIG. 22-B is a longitudinal sectional view taken along the line XXIIB-XXIIB in FIG. 22-A;
  • FIG. 23 is waveform diagram of the ninth embodiment employing the magneto generator shown in FIG. 22; and v FIG. 25 shows an ignition cycle of the twelth embodiment shown in FIG. 24.
  • numerals 1 and 2 designate first and second capacitor charging coils.
  • Said first coil l which is mainly used at low speed rotation has a larger number of turns than that of said second coil 2 which is mainly used at high speed rotation.
  • Numerals 3 and 4 designate battery charging coils, and 5a, 5b and 5c generating coils for other electric loads.
  • a numeral 6 designates a pole core wound with said first coil 1, 7 a pole core for said second coil 2 and said battery charging coil 3.
  • Numerals 8, 9 and 10 designate pole cores for said generating coil 5a, 5b and 5c, respectively and 11 a pole core for said battery charging coil 4.
  • Said first coil 1 has a center tap 1c and comprises two winding parts la and lb.
  • a numeral 12 designates a diode, 13 a capacitor, 14 a diode, l5 and ignition coil having a primary winding 15a and a secondary winding 15b, 16 spark plugs mounted on each cylinder of a two-cylinder-two-cycle engine, 17 a thyristor consituting a semiconductor switching element, 18 and 19 diodes, 20 a transfonner having a primary winding 20a and a secondary winding 20b for controlling said thyristor 17, 21, 22, 23 and 24 diodes respectively, 25 a battery installed in a vehicle,
  • 26 a full-wave rectifier, 27a and 27b switch means for connecting an output terminal of said rectifier and lamp loads 28.
  • a numeral 29 designates a stator comprising six pole cores 6, 7, 8, 9, l and 11 extending internally at equal intervals, and coils 1 to c are wound thereon as previously mentioned.
  • a numeral 30 designates a rotor comprising a permanent magnet 32 circumferentially polarized to have north and south poles 32a to 32d alternatively, four magnetic pole pieces 33a to 33d provided at the peripheral ends of said magnet 32 and a nonmagnetic material 31a such as aluminum or synthetic resin for embedding securely said magnet and magnetic pole pieces. Said rotor 30 is connected to a crankshaft 34a of an engine.
  • the capacitor charging coil 1 for each revolution of the magneto generator, i.e., for each revolution of the engine crankshaft 34a, the capacitor charging coil 1 generates two cycles of the AC voltage as shown in FIG. 3(a), while the capacitor charging coil 2 generates two cycles of the AC voltages as shown in FIG. 3(b), which is retarded with respect to that of the coil 1 by an angle of about 60.
  • the battery charging coil 3 for each revolution of the crankshaft 34a, the battery charging coil 3 generates two cycles of the AC voltages indicated by a solid line in FIG. 3(e) while the voltage of the coil 4 being indicated by a broken line in FIG. 3(e), wherein each voltage of said coils 3 and 4 are respectively retarded by an angle of about 120 with respect to each voltage of said coils l and 2.
  • the capacitor 13 is finally charged to develop thereacross the terminal voltage as indicated by a solid line in FIG. 3(e).
  • the voltage generated at the coil 1 is shortcircuited through the circuit comprising the part lb of the coil 1 and the diode 18 and the circuit comprising the other part 1a of the coil 1, the primary winding a of the transformer 20, the diode 19 and the part lb of the coil 1.
  • an output voltage is produced at the secondary winding 20b as indicated by a solid line in FIG. 3(d) and the thyristor 17 is made conductive at a time T4 in FIG.
  • the purpose of the diode 14 is to keep the current flowing though the primary winding 15a of the ignition coil 15 to extend the arc duration of the ignition spark.
  • the above-mentioned operation is repeated twice for every rotation of the engine crankshaft, namely two ignition sparks are caused for each revolution of the magneto generator.
  • the switch means 27a and 27b are opened, and thereby the battery 25 is charged with the half wave voltage of the positive direction generated at the coils 3 and 4, whose waveforms are shown in FIG. 3(e) through the diodes 23 and 24, while in the nighttime, the switch means 27a and 27b are closed so that the lamp loads 28 are mainly supplied with the electric current from the full-wave rectifier 26.
  • the pole cores 7 and 11 on which the capacitor charging coil 2 and the battery charging coils 3 and 4 are respectively wound are positioned at the both adjacent sides of the pole core 6 on which the capacitor charging coil 1 is wound, as shown in FIG. 2.
  • the-on-off operation of the switch means 27b has no influence on the generated voltage of the coil 1, whereby the fluctuation of the ignition timing due to the on-off operation of the switch means 27b is prevented.
  • the generated voltage of the coil 2 may be fluctuated a-little due to on-off operation of the switch means 27b, thereby causing fluctuation of the charging voltage of the capacitor 13 since the coils 2 and 3 are wound on the same pole core 7.
  • the capacitor charging coil 2 is to be wound on the pole core 7 without the battery charging coil 3 and the output voltage of the coil 4 is to be supplied to the battery 25 through the full-wave rectifier 26.
  • FIG. 4 shows the second embodiment of the present invention, in which the capacitor charging coil 1 is connected in series with the capacitor charging coil 2 whose generating voltage is retarded by the angle of 60 with respect to that of the coil 1 and the diodes l2 and 19 are respectively connected in parallel with the capacitor charging coils 2 and l.
US452360A 1973-03-29 1974-03-18 Capacitor discharge type contactless ignition system for internal combustion engines Expired - Lifetime US3911889A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1973038583U JPS5326494Y2 (de) 1973-03-29 1973-03-29
JP5420573U JPS5319315Y2 (de) 1973-05-08 1973-05-08

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US3911889A true US3911889A (en) 1975-10-14

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DE (1) DE2415465A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2357902A1 (fr) * 1976-07-06 1978-02-03 Motorola Inc Detecteur de sens de rotation pour la commande de l'allumage d'un moteur
US4079712A (en) * 1975-01-31 1978-03-21 Nippondenso Co., Ltd. Contactless capacitor discharge type ignition system for internal combustion engine
US4116188A (en) * 1973-10-17 1978-09-26 Nippondenso Co., Ltd. Capacitor discharge type contactless ignition system for internal combustion engines
US4244337A (en) * 1978-05-30 1981-01-13 Nippondenso Co., Ltd. Ignition system for internal combustion engines
US4399801A (en) * 1980-10-17 1983-08-23 Kioritz Corporation Overrun prevention ignition system with ignition angle retardation circuit
US4515140A (en) * 1982-11-04 1985-05-07 Oppama Kogyo Kabushiki Kaisha Contactless ignition device for internal combustion engines
US4651705A (en) * 1985-05-10 1987-03-24 Kokusan Denki Co., Ltd. Ignition system for an internal combustion engine
US5040519A (en) * 1987-02-09 1991-08-20 Outboard Marine Corporation System to prevent reverse engine operation
US20040251762A1 (en) * 2003-06-13 2004-12-16 Ducati Energia S.P.A. Magneto generator for self-powered apparatuses

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4215672C2 (de) * 1991-05-14 1996-11-07 Fuji Robin Kk Zweizylinder-Reihen-Zweitaktmotor
IT1256379B (it) * 1992-11-09 1995-12-04 Ducati Energia Spa Impianto elettronico di accensione per motori a scoppio,con sistema di alimentazione dei carichi differenziato
IT1256480B (it) * 1992-12-10 1995-12-07 Ducati Energia Spa Sistema elettronico di alimentazione per accensioni a scarica capacitiva per motori a combustione interna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490426A (en) * 1967-07-20 1970-01-20 Tecumseh Products Co Ignition system
US3518978A (en) * 1968-03-04 1970-07-07 Brunswick Corp Triggered ignition system for internal combustion engines with means to restrict operation to unit directional rotation
US3566188A (en) * 1968-10-31 1971-02-23 Brunswick Corp Triggered ignition system
US3598098A (en) * 1968-05-02 1971-08-10 Bosch Gmbh Robert Ignition arrangment for internal combustion engines
US3723809A (en) * 1970-04-04 1973-03-27 Nippon Denso Co Magneto-dynamo-operated ingition device for multi-cylinder engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490426A (en) * 1967-07-20 1970-01-20 Tecumseh Products Co Ignition system
US3518978A (en) * 1968-03-04 1970-07-07 Brunswick Corp Triggered ignition system for internal combustion engines with means to restrict operation to unit directional rotation
US3598098A (en) * 1968-05-02 1971-08-10 Bosch Gmbh Robert Ignition arrangment for internal combustion engines
US3566188A (en) * 1968-10-31 1971-02-23 Brunswick Corp Triggered ignition system
US3723809A (en) * 1970-04-04 1973-03-27 Nippon Denso Co Magneto-dynamo-operated ingition device for multi-cylinder engines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116188A (en) * 1973-10-17 1978-09-26 Nippondenso Co., Ltd. Capacitor discharge type contactless ignition system for internal combustion engines
US4079712A (en) * 1975-01-31 1978-03-21 Nippondenso Co., Ltd. Contactless capacitor discharge type ignition system for internal combustion engine
FR2357902A1 (fr) * 1976-07-06 1978-02-03 Motorola Inc Detecteur de sens de rotation pour la commande de l'allumage d'un moteur
US4244337A (en) * 1978-05-30 1981-01-13 Nippondenso Co., Ltd. Ignition system for internal combustion engines
US4399801A (en) * 1980-10-17 1983-08-23 Kioritz Corporation Overrun prevention ignition system with ignition angle retardation circuit
US4515140A (en) * 1982-11-04 1985-05-07 Oppama Kogyo Kabushiki Kaisha Contactless ignition device for internal combustion engines
US4651705A (en) * 1985-05-10 1987-03-24 Kokusan Denki Co., Ltd. Ignition system for an internal combustion engine
US5040519A (en) * 1987-02-09 1991-08-20 Outboard Marine Corporation System to prevent reverse engine operation
US20040251762A1 (en) * 2003-06-13 2004-12-16 Ducati Energia S.P.A. Magneto generator for self-powered apparatuses
US6943476B2 (en) 2003-06-13 2005-09-13 Ducati Energia S.P.A. Magneto generator for self-powered apparatuses

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Publication number Publication date
DE2415465B2 (de) 1978-10-19
DE2415465A1 (de) 1974-10-17

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