US3911886A - Ignition system for an internal combustion engine - Google Patents

Ignition system for an internal combustion engine Download PDF

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Publication number
US3911886A
US3911886A US475279A US47527974A US3911886A US 3911886 A US3911886 A US 3911886A US 475279 A US475279 A US 475279A US 47527974 A US47527974 A US 47527974A US 3911886 A US3911886 A US 3911886A
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United States
Prior art keywords
capacitor
switching element
ignition
another
coil
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Expired - Lifetime
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US475279A
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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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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H02K21/222—Flywheel magnetos
    • H02K21/225—Flywheel magnetos having I-shaped, E-shaped or similarly shaped armature cores
    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/03—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors with electrical means

Definitions

  • This invention relates to an ignition system in which a magneto generator is employed an electric power source, and especially to a capacitor discharge type contactless ignition system for providing ignition sparks successively to respective spark plugs of a multicylinder engine.
  • an abnormal firing may be also caused in a like manner described before.
  • FIG. 1 is an electric wiring diagram showing the first embodiment of the present invention
  • FIG. 2(A) is a longitudinal sectional view of a magneto generator employed in the present invention, which is taken along the line IIA-IIA in FIG. 2(B),
  • FIG. 2(8) is a transverse sectional view of the magneto generator taken along the line IIB-IIB in FIG. (A).
  • FIG. 3 is a waveform diagram for explaining mainly the operation of the first embodiment
  • FIG. 4 is an electric wiring diagram showing the second embodiment of the present invention.
  • FIG. 5 is an electric wiring diagram showing the third embodiment of the present invention.
  • FIG. 6 is a partial electric wiring diagram which can be a replacement for part of the second embodiment (FIG. 4), and
  • FIGS. 7, 8 and 9 are partial electric wiring diagrams which can be replacements for part of the third embodiment (FIG. 5).
  • numeral 1 designates a high speed capacitor charging coil having a relatively low number of turns for generating a larger electric power during high speed running of an engine
  • numeral 2 designates a low speed capacitor charging coil having a relatively high number of turns for generating a larger electric power during mainly a low speed running of the engine.
  • a numeral 3 designates a diode for rectifying alternating current generated at said coils 1 and 2, 4 and 5 capacitors, 6 and 7 ignition coils having primary windings 6a and 7a and secondary windings 6b and 7b, 8 and 9 diodes connected in parallel with said primary windings 6a and 7a for extending arc duration of ignition sparks produced at spark plugs 14 and 15, 10 and 11 thyristors constituting semi-conductor switching elements, 12 and 13 timing signal generating coils constituting timing signal generators mounted in a magneto generator, 16 and 17 diodes connected in parallel with said generating coils 12 and 13, and 16a a diode connected in parallel with said low speed capacitor charging coil 2.
  • a numeral 30 designates a rotor comprising an iron shell 31, eight permanent magnets 32a to 32/1 spaced apart at equal intervals and securely embedded in the inner side of the iron shell 31 by means of a nonmagnetic material 31a such as aluminum or resin, pole pieces 33a to 3311 secured respectively to the inner face of the permanent magnets 32a to 32/1, a center piece 34 securely mounted on a crankshaft 34a of an engine by a nut 34b and securely fixing the iron shell 31 by means of rivets (not shown) and timing cores 35a to 35g secured to the center piece 34.
  • a nonmagnetic material 31a such as aluminum or resin
  • pole pieces 33a to 3311 secured respectively to the inner face of the permanent magnets 32a to 32/1
  • a center piece 34 securely mounted on a crankshaft 34a of an engine by a nut 34b and securely fixing the iron shell 31 by means of rivets (not shown) and timing cores 35a to 35g secured to the center piece 34.
  • a numeral 40 designates a stator secured to the engine, 41 and 42 capacitor charging cores securely mounted on the stator 40 at a position opposite to each other and on which said high speed and low speed capacitor charging coils 1 and 2 are wound.
  • Numerals 43a and 43b designate lamp load cores securely mounted on the stator 40 at a position displaced respectively by about from said capacitor charging cores 41 and 42, with a lamp load supply coils 44a and 44b constituting a power supply for a load such as lamps.
  • Numerals 22a and 22b designate stators of said timing signal generators securely mounted on the stator 40 at a position angularly displaced respectively by
  • the thyristor 10 is driven into conduction at the same time, however, no ignition spark can be produced at the spark plug 14 since the capacitor 4 has not been charged.
  • the thyristor 11 When the third .cycle of the generated voltage of the capacitor charging coils 1 and 2 begins to increase in the positive direction at a time T5, the thyristor 11 is made conductive by the output voltage produced at the timing signal generating coil 13 as shown in FIG. 3(8) and then the current flows through the circuit comprising the capacitor charging coils l and 2, the diode 3, the capacitor 4, a parallel circuit of the diode 8 and the primary winding 6a of the ignition coil 6, the thyristor 11 and the ground. This current charges the capacitor 4 to develop thereacross the terminal voltage as indicated by an one-dot-chain line in FIG. 3(A).
  • the timing signal generating coils l2 and 13 generate the output voltages, so that the thyristor 10 is driven into conduction, whereby the charge stored in the capacitor 4 is discharged through the circuit comprising the capacitor 4, the thyristor 10, and the primary winding 6a of the ignition coil 6, thereby inducing a high voltage in the secondary winding 6b of the ignition coil 6 and producing an ignition spark at the spark plug 14.
  • the thyristor 11 is driven into conduction at the same time, however, no ignition spark can be produced at the spark plug 15 since the capacitor 5 has not been charged.
  • both thyristors l0 and l l are driven into conduction due to the output voltages of the timing signal generating coils l2 and 13, and thus the capacitor charging coils l and 2 are shortcircuited through said both thyristors, thereby to make the charging of the capacitor 4 or 5 ineffective.
  • both thyristors are made conductive no ignition spark can be produced at the spark plugs 14 and 15 in the like manner described before.
  • the generated voltage of the capacitor charging coils l and 2 begins to increase in the positive direction at times T8, T6, T4 and T2 and at every one of those times T8, T6, T4 and T2 both timing signal generating coils l2 and 13 generate the output voltages so that both thyristors l0 and l l are driven into conduction at the same time, whereby neither the capacitor 4 nor the capacitor 5 can be charged at any time thus preventing an ignition spark from being produced during the reverse rotation of the engine, and therefore the reverse rotation can not be continued by the engine itself.
  • the embodiment described above is designed for preventing the engine from being rotated in the reverse direction, however when there is no need to design the magneto generator for preventing the reverse rotation of the engine, some of the output voltages of the timing signal generating coils 12 and 13 can be eliminated, in other words, some of the seven cores 35a to 35g can be eliminated. In this respect, two cores of them, for instance, 35a and 35f are sufficient to get such output voltages as shown in FIGS. 2(D) and (E). According to this modification, when the thyristor is made conductive at the times T1 and T3 due to the output voltages of the coil 12 as shown in FIG.
  • the first and second cycle of the generated voltage of the capacitor charging coils l and 2 charges the capacitor 5 to develop thereacross the terminal voltage as indicated by a broken line in FIG. 2(F).
  • the thyristor 11 is driven into conduction due to the output voltage of the coil 13 as shown in FIG. 2(E), and the charge stored in the capacitor 5 is discharged to produce an ignition spark 15, at the same time the capacitor 4 begins to be charged.
  • the capacitor 4 is going to be charged further as indicated by an one-dot-chain line in FIG. 2(F), and then at the time T1 whenthe thyristor 10 is made conductive, the capacitor 5 begins to be charged as well as the charge stored in the capacitor 4 is discharged to produce an ignition spark at the spark plug 14.
  • FIG. 4 illustrates the second embodiment of the present invention.
  • the second embodiment differs from the first embodiment in that a series circuit of a diode 18 and a primary winding 21a of a transformer 21 having two secondary windings 21b and 21c is connected in parallel with capacitor charging coils l and 2, each one end of the secondary windings 21b and 21c is respectively connected to the gates of the thyristors 11 and 10 through respective diodes and 19, and diodes 16 and 17 are respectively connected in series between the gates of the thyristors 10 and 11 and the timing signal generating coils 12 and 13.
  • this second embodiment when the generated voltage of the capacitor charging coils 1 and 2 begins to increase in the negative direction, at the times T2, T4, T6 and T8 in FIG.
  • the secondary windings 21b and 21c of the transformer 21 generate output voltages due to electric current flowing through the primary winding 21a caused by the generated voltage increasing in the negative direction, so that the thyristors 10 and 11 are driven into conduction.
  • the output voltages of the secondary windings 21b and 21c of the transformer are not large enough to make the thyristors 10 and lll conductive before the thyristors 10 and 11 are driven into conduction due to the output voltages produced at the timing signal generating coils 12 and 13, however as the engine speed increases the output voltages of the secondary windings 21b and 21c increase large enough to make the thyristors conductive earlier than the output voltages of the timing signal generating coils 12 and 13.
  • the ignition timing can be advanced due to the output voltage of the secondary winding 21b, and in the same way at the time T6, the ignition timing when the ignition spark should be produced at the spark plug 14 can be advanced due to the output voltage of the secondary winding 210.
  • the thyristors l0 and 11 are driven into conduction earlier than the conduction due to the output voltages of the timing signal generating coils l2 and 13 as well, however no problem occurs since the capacitors 4 and 5 have not been charged at those times as described before.
  • FIG. 5 illustrates the third embodiment of the present invention
  • the third embodiment differs from the first embodiment in that a thyristor 25 is connected in parallel with the series circuit of the thyristors 10 and 11, a primary winding 21a of a transformer 21 having a secondary winding connected to the gate of said thyristor 25 is connected in parallel with the capacitor charging coils 1 and 2, and diodes 8a and 9a are respectively connected in parallel with the series circuits of the capacitors 4 and 5 and the primary windings 6a and 7a of the ignition coils 6 and 7.
  • the ignition timing can be advanced in the like manner as described in the second embodiment, however it should be noted in this embodiment that when the thyristor 25 is driven into conduction earlier than the thryristors l0 and 11, the charge stored in the capacitor 4 or 5 is discharged through the circuit comprising the capacitor 4, the thyristor 25, the ground, the diode 9a, and the primary winding 6a of the ignition coil 6, or the circuit comprising the capacitor 5, the diode 8a, the thyristor 25, the ground, and the primary winding 7a of the ignition coil 7. Other operation is almost same as that of the first embodiment.
  • FIG. 6 illustrates an arrangement of the transformer 21 shown in FIG. 4, in which a numeral 56 designates a voltage converting circuit comprising a zener diode 57 and two resistors 58 and 59 respectively connected to the gates of the thyristors 10 and 11, and the operation of this arrangement is almost same as that of the second embodiment.
  • FIGS. 7, 8 and 9 illustrate other arrangements which can be substituted for the transformer 21 shown in FIG. 5, and the operation is almost same as that of the third embodiment, whereby it is omitted.
  • a voltage converting circuit 26 operates as follows. When the generated voltage of the capacitor charging coils l and 2 increases in the negative direction, an electric current flowing through the ground, a resistor 26a, a capacitor 26b, and the diode 18 charges the capacitor 26b as indicated by its polarity.
  • a zener diode 26c becomes conductive and then the generated voltage of the capacitor charging coils 1 and 2 is applied to a gate of a thyristor 26d so as to make it conductive, so that the charge stored in the capacitor 26b is discharged through the gate of the thyristor 25, the cathode thereof, the ground and the thyristor 26d, whereby the thyristor 25 is driven into conduction.
  • the end of the capacitor charging coil 2 is grounded through the gate and cathode of the thyristor 25 as well as a diode 16b in parallel. And a junction point of the capacitor charging coils l and 2 is also grounded through a series circuit of a resistor 55 and the diode 16a.
  • the thyristor 25 is replaced by a bidirectional thyristor 25a, and its gate is connected to a junction point of the capacitor charging coils l and 2 through a resistor 55 and the diode 16a.
  • An ignition system for an internal combustion engine comprising;
  • a rectifying element connected to said capacitor charging coil, for rectifying said AC voltage
  • a switching element having a control gate and connected to said capacitor charging coil in parallel with said capacitor
  • an ignition coil having a primary winding connected in series with said capacitor and a secondary winding
  • a switching element controlling means connected to said control gate of said switching element; wherein the improvement comprises;
  • another ignition coil having a primary winding connected in series with said another capacitor and a secondary winding
  • another switching element having a control gate, and connected to said capacitor charging coil through said parallel circuit and in parallel with said another capacitor;
  • said switching element controlling means being so arranged to make said switching element conductive at least when said another capacitor is to be charged and when the charge stored in said capacitor is to be discharged at the ignition timing for said spark plug, and said another switching element controlling means being so arranged to make said another switching element conductive at least when said capacitor is to be charged and the charge stored in said another capacitor is to be discharged at the other ignition timing for said another spark plug,
  • each of said switching element controlling means and said another switching element controlling means respectively comprising a generating coil which generates an output voltage in synchronism with the rotation of said internal combustion engine.
  • An ignition system for an internal combustion engine in accordance with claim 1 further comprising;
  • a third switching element controlling means having two output terminals respectively connected to said gates of said switching element and said another switching element.
  • An ignition system for an internal combustion engine in accordance with claim 1 further comprising;
  • a third switching element having a control gate and connected to said capacitor charging coil through said rectifying element in parallel with both said switching element and said another switching element;
  • a third switching element controlling means whose output terminal is connected to said control gate of said third switching element.
  • said third switching element controlling means comprises a transformer having a primary winding connected in parallel with said capacitor charging coil.
  • said third switching element controlling means comprises a zener diode whose anode is connected to said capacitor charging coil in parallel with said rectifying element, and whose cathode is connected in parallel to two resistors constituting said output terminals.
  • said third switching element controlling means comprises a transformer whose primary winding is connected in parallel with said capacitor charging coil, and whose secondary winding constitutes said output terminal.
  • An ignition system for an internal combustion engine comprising:
  • a series connection including a capacitor charging coil, a rectifying element, a first capacitor, a first primary winding, a second capacitor and a second primary winding;
  • a first ignition coil having said first primary winding and a first secondary winding
  • a first signal generator connected with said first switching element for generating a first ignitional signal, whereby the charge stored in said first ca pacitor is discharged to thereby produce the igni tion spark atsaid first spark plug;
  • a second discharge circuit including said second capacitor, said second primary winding and a second switching element
  • a second ignition coil having said second primary winding and a second secondary winding
  • a second signal generator connected with said second switching element for generating a second ignition signal at a time except when said first ignition signal is generated, whereby the charge stored in said second capacitor is discharged thereby to produce the ignition spark at said second spark plug.
  • An ignition system for an internal combustion engine comprising:
  • a first charging circuit in series including a capacitor charging coil, a first capacitor and a second switching element, said first capacitor being charged with the output voltage at said capacitor charging coil when said second switching element is conductive;
  • a first discharging circuit in series including said first capacitor, a first switching element and a first primary winding, the charge stored in said first capacitor being discharged when said first switching element is made conductive;
  • a first ignition coil having said first primary winding and a first secondary winding
  • a first signal generator connected with said first switching element for generating a first ignition signal thereby to make said first switching element conductive
  • a second charging circuit in series including said capacitor charging coil, said first switching element and a second capacitor, said second capacitor a second signal generator connected with said second switching element for generating a second ignition signal thereby to make said second switching element conductive;
  • said first and second signal generator generating alternately said first and second ignition signal, whereby the charge and discharge for said first and second capacitor are alternately carried out, thereby producing ignition sparks alternately at said first and second spark plug.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US475279A 1973-07-10 1974-05-31 Ignition system for an internal combustion engine Expired - Lifetime US3911886A (en)

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JP7805873A JPS5617540B2 (enrdf_load_html_response) 1973-07-10 1973-07-10

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Cited By (14)

* 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
DE2920486A1 (de) * 1978-05-24 1980-01-03 Nippon Denso Co Zuendanlage fuer brennkraftmaschinen mit magnetzuendung
US4213436A (en) * 1978-09-13 1980-07-22 R. E. Phelon Company, Inc. Capacitor discharge ignition and alternator auxiliary power system
FR2452819A1 (fr) * 1979-03-27 1980-10-24 Mulfingen Elektrobau Ebm Moteur a courant continu a rotor exterieur sans collecteur
FR2462045A1 (fr) * 1979-07-18 1981-02-06 Chauvin Arnoux Sa Voyant magnetique multipolaire entraine par un embrayage centrifuge
US4259938A (en) * 1978-06-02 1981-04-07 Aktiebolaget Svenska Electromagneter Apparatus in electronic ignition systems
US4325350A (en) * 1979-11-28 1982-04-20 Brunswick Corporation Alternator-powered breakerless capacitor discharge ignition system having improved low-speed timing characteristics
US4402298A (en) * 1980-10-09 1983-09-06 Yamaha Hatsudoki Kabushiki Kaisha Ignition system trigger circuit for internal combustion engines
US4413608A (en) * 1981-11-27 1983-11-08 The Economy Engine Company Electronic ignition with advance
US4515140A (en) * 1982-11-04 1985-05-07 Oppama Kogyo Kabushiki Kaisha Contactless ignition device for internal combustion engines
US4566425A (en) * 1984-07-02 1986-01-28 Kokusan Denki Co., Ltd. Ignition system of the condensor-discharge type for internal combustion engine
US6574085B1 (en) * 1999-09-16 2003-06-03 Oppama Industry Co., Ltd. Power supply apparatus for electrostatic charging and method for same
US20080224626A1 (en) * 2007-03-15 2008-09-18 Shimadzu Corporation Optical emission spectrometry device
US20150369203A1 (en) * 2013-03-25 2015-12-24 Shindengen Electric Manufacturing Co., Ltd. Ignition control apparatus and ignition control method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585094Y2 (ja) * 1976-11-05 1983-01-28 株式会社デンソー 内燃機関点火装置
JPS585093Y2 (ja) * 1976-11-05 1983-01-28 株式会社デンソー 内燃機関点火装置
JPS54122380A (en) * 1978-03-16 1979-09-21 Nippon Hardboard Forming method of fiber board
JPS58225339A (ja) * 1982-06-25 1983-12-27 Nishi Nippon Riyuutai Giken:Kk 造波装置
JP2624959B2 (ja) * 1986-11-26 1997-06-25 松下電工株式会社 鉱物繊維板の曲面加工方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577971A (en) * 1968-11-18 1971-05-11 Outboard Marine Corp Contactless and distributorless ignition system
US3587550A (en) * 1969-05-16 1971-06-28 Fairbanks Morse Inc Electronic ignition control system
US3704397A (en) * 1971-12-13 1972-11-28 Syncro Corp Ignition adapter circuit
US3723809A (en) * 1970-04-04 1973-03-27 Nippon Denso Co Magneto-dynamo-operated ingition device for multi-cylinder engines
US3741185A (en) * 1971-07-06 1973-06-26 Eltra Corp Capacitor discharge ignition system
US3809044A (en) * 1971-01-22 1974-05-07 Outboard Marine Corp Capacitor triggered ignition system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577971A (en) * 1968-11-18 1971-05-11 Outboard Marine Corp Contactless and distributorless ignition system
US3587550A (en) * 1969-05-16 1971-06-28 Fairbanks Morse Inc Electronic ignition control system
US3723809A (en) * 1970-04-04 1973-03-27 Nippon Denso Co Magneto-dynamo-operated ingition device for multi-cylinder engines
US3809044A (en) * 1971-01-22 1974-05-07 Outboard Marine Corp Capacitor triggered ignition system
US3741185A (en) * 1971-07-06 1973-06-26 Eltra Corp Capacitor discharge ignition system
US3704397A (en) * 1971-12-13 1972-11-28 Syncro Corp Ignition adapter circuit

Cited By (16)

* 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
DE2920486A1 (de) * 1978-05-24 1980-01-03 Nippon Denso Co Zuendanlage fuer brennkraftmaschinen mit magnetzuendung
US4259938A (en) * 1978-06-02 1981-04-07 Aktiebolaget Svenska Electromagneter Apparatus in electronic ignition systems
US4213436A (en) * 1978-09-13 1980-07-22 R. E. Phelon Company, Inc. Capacitor discharge ignition and alternator auxiliary power system
FR2452819A1 (fr) * 1979-03-27 1980-10-24 Mulfingen Elektrobau Ebm Moteur a courant continu a rotor exterieur sans collecteur
FR2462045A1 (fr) * 1979-07-18 1981-02-06 Chauvin Arnoux Sa Voyant magnetique multipolaire entraine par un embrayage centrifuge
US4325350A (en) * 1979-11-28 1982-04-20 Brunswick Corporation Alternator-powered breakerless capacitor discharge ignition system having improved low-speed timing characteristics
US4402298A (en) * 1980-10-09 1983-09-06 Yamaha Hatsudoki Kabushiki Kaisha Ignition system trigger circuit for internal combustion engines
US4413608A (en) * 1981-11-27 1983-11-08 The Economy Engine Company Electronic ignition with advance
US4515140A (en) * 1982-11-04 1985-05-07 Oppama Kogyo Kabushiki Kaisha Contactless ignition device for internal combustion engines
US4566425A (en) * 1984-07-02 1986-01-28 Kokusan Denki Co., Ltd. Ignition system of the condensor-discharge type for internal combustion engine
US6574085B1 (en) * 1999-09-16 2003-06-03 Oppama Industry Co., Ltd. Power supply apparatus for electrostatic charging and method for same
US20080224626A1 (en) * 2007-03-15 2008-09-18 Shimadzu Corporation Optical emission spectrometry device
US7643267B2 (en) * 2007-03-15 2010-01-05 Shimadzu Corporation Optical emission spectrometry device
US20150369203A1 (en) * 2013-03-25 2015-12-24 Shindengen Electric Manufacturing Co., Ltd. Ignition control apparatus and ignition control method
US10359020B2 (en) * 2013-03-25 2019-07-23 Shindengen Electric Manufacturing Co., Ltd. Ignition control apparatus and ignition control method

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JPS5617540B2 (enrdf_load_html_response) 1981-04-23
JPS5025946A (enrdf_load_html_response) 1975-03-18
CA1021018A (en) 1977-11-15

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