US3893439A - Magneto ignition system for internal combustion engines - Google Patents

Magneto ignition system for internal combustion engines Download PDF

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Publication number
US3893439A
US3893439A US413975A US41397573A US3893439A US 3893439 A US3893439 A US 3893439A US 413975 A US413975 A US 413975A US 41397573 A US41397573 A US 41397573A US 3893439 A US3893439 A US 3893439A
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United States
Prior art keywords
winding
diode
voltage
armature
capacitor
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Expired - Lifetime
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US413975A
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English (en)
Inventor
Peter Chudoba
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • a second diode is connected between the two windings in such a way that when there is a positive voltage half-wave of the polarity which causes the first diode to conduct, the second diode is blocked so long as the winding with the larger number of turns has a voltage exceeding that across the winding with the smaller number of turns. At higher speeds the second diode conducts, thus preventing the capacitor voltage at ignition time from dropping with increasing speed.
  • voltage half-waves of the opposite polarity when both windings are unloaded, the second diode conducts at whatever the speed the engine is running, reducing the peak voltage by the equalizing current that flows and thus protects the first diode against the possibility of excessive back voltage.
  • This invention relates to an ignition system for an internal combustion engine, of the magneto type in which a capacitor is charged by at least one diode and is discharged through a spark coil at the proper ignition time when a semiconductor switching element is put into its conducting condition. More particularly, the invention relates to ignition systems of that type in which the magneto generator has two armature windings in which an alternating current of the same phase is generated, with at least the armature winding with the larger number of turns being connected to the capacitor over a diode.
  • the armature winding with the smaller number of turns is connected to the end of the armature winding with the larger number of turns over a second diode so connected that in the presence of a voltage half-wave producing conduction in the first diode connected between the armature winding with the larger number of turns and the capacitor) the second diode has voltage applied to it in the blocking direction, so long as the voltage produced by the winding with the larger number of turns is greater than that produced by the winding with the smaller number of turns.
  • FIG. 1 is a diagram of an ignition system for a one cylinder internal combustion engine
  • FIG. 2 is a graph showing the capacitor voltage reached at the time of ignition as a function of the speed of the engine
  • FIGS. 3a and 3b show, for the lower speed range and the higher speed range respectively, the time course of voltage half-waves in the two armature windings operating in unloaded condition.
  • the ignition system shown in FIG. 1 comprises a magneto generator 10 having a field rotor (pole wheel) 11 driven by the internal combustion engine.
  • the rotor 11 has permanent magnets of alternating polarity evenly distributed about its periphery surrounding a stator consisting of an armature plate 13 on which are provided on opposite sides two armatures l4 and 15. Each of these armatures is provided with an armature winding 16,17, these armature windings differing in wire cross-section and in the number of turns.
  • the flux 1 linking the armature windings l6 and I7 for the position of the field rotor 11 shown in FIG. I is designated by an arrow for each of these windings.
  • the two windings l6 and I7 are connected in phase, with their ends 16a and 17a connected to ground or chassis and with their other ends 161; and 17b connected together through a diode l8 and then connected over another diode 19 to a capacitor 20, which has its other connection likewise grounded.
  • the primary winding 21a of a spark coil 21, in series with a semiconductor controlled rectifier (SCR) 22 are connected in parallel with the capacitor 20.
  • the secondary winding 21b of the spark coil 21 has one end connected to the primary winding 21a and the SCR 22 and its other end connected by an ignition cable 23 with a spark plug 24 of the internal combustion engine.
  • the two armature cores l4 and 15 are mounted within the magnet bearing rim of the field rotor ll of the magneto generator 10. They are provided in the form of chord-type armatures mounted on opposite halves of the armature plate I3, so that in every position of the field rotor 11 they are linked by approximately the same magnetic flux b
  • the armature winding 16, which has the smaller number of turns, about 1400 turns, has one end 16b connected to the anode of the diode 18, which is connected in series with the diode 19, the cathode of which is connected both with the primary winding 21a of the spark coil 21 and with the ungrounded connection of the capacitor 20.
  • the armature winding 17 has about 8000 turns and has one end 17b connected to the interconnection of the diodes l8 and 19, where it connects with the cathode of the diode l8 and the anode of the diode 19.
  • FIG. 2 shows the dependence of the voltage at the capacitor 20 upon the speed n of the internal combustion engine. In the lower speed range a greater voltage U17 is induced in the winding 17 that has the larger number of turns than in the winding 16 with the smaller number of turns.
  • the positive halfwaves of this alternating voltage are supplied to the capacitor 20 over the diode 19, charging the capacitor to a voltage U by the time of ignition, when the capacitor is discharged by the switching of the SCR into its conducting condition by a signal applied to its control electrode.
  • the discharge of the capacitor through the primary winding 21a of the spark coil induces a high voltage pulse in the secondary winding 21b to produce a spark in the spark plug 24.
  • the value of the voltage U is shown for various engine speeds by the solid line in FIG. 2.
  • FIG. 3a shows the time course of the voltage during positive and negative half-waves in unloaded condition of the armature windings 16 and 17 which, as mentioned before, are energized in phase.
  • the voltage U17 in the winding 17 is considerably higher than the voltage U16 of the armature winding 16. Accordingly, for the positive voltage half-waves, the voltage U17 reaches the capacitor 20 over the diode 19, whereas the positive half-wave of the voltage U16 is blocked by the diode 18, because the higher voltage U17 is applied to its cathode.
  • the diode 18 becomes conducting, because the voltage U16 at the anode of the diode 18 is less negative than the voltage U17.
  • the diodes 18 and 19 can also perform their functions at other positions of the circuit. What is essential is that the diode 18 is so connected between the co-phased parallel connected armature winding 16 and 17 that in the presence of a voltage half-wave that causes the diode 19 to conduct, the diode 18 is blocked at speeds at which the winding 17 delivers a higher voltage under load than the winding 16.
  • magneto generators that are required to supply, in addition to an ignition system, other electrical devices, for example the lighting system of a motor cycle
  • a magneto ignition system for an internal combustion engine comprising:
  • a spark coil having its primary winding in circuit with a semiconductor switch and said capacitor and having its secondary winding in circuit with at least one spark plug of said engine;
  • said magneto generator having first and second arm ature windings positioned so as to be excited in phase synchronism, said first winding having a substantially larger number of turns than said second winding;
  • additional diode rectifying means (18) connected in series with said second armature winding (17), the series combination of said second armature winding (17) and said additional diode rectifying means (18) being connected in parallel with said first armature winding, said additional diode rectifying means being so poled that during a generated halfwave of polarity such that said first diode conducts, said second diode is blocked so long as the voltage across said first winding exceeds the voltage across said second winding.
  • each of said armature windings is wound on a chord armature arranged within a multiple pole field rotor (11) and supported on opposite halves of an armature plate (13).
  • a magneto ignition system as defined in claim 1 in which the respective armatures (14,15) carrying the armature windings (16,17) are magnetically in parallel with each other.
  • a magneto ignition system as defined in claim 3 in which the two armatures (14,15) are in superimposed arrangement.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
US413975A 1972-11-11 1973-11-08 Magneto ignition system for internal combustion engines Expired - Lifetime US3893439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2255396A DE2255396C3 (de) 1972-11-11 1972-11-11 Zündeinrichtung für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3893439A true US3893439A (en) 1975-07-08

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ID=5861498

Family Applications (1)

Application Number Title Priority Date Filing Date
US413975A Expired - Lifetime US3893439A (en) 1972-11-11 1973-11-08 Magneto ignition system for internal combustion engines

Country Status (6)

Country Link
US (1) US3893439A (ja)
JP (1) JPS5761894B2 (ja)
BR (1) BR7308701D0 (ja)
DE (1) DE2255396C3 (ja)
ES (1) ES420430A1 (ja)
IT (1) IT1001647B (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974816A (en) * 1974-07-17 1976-08-17 Colt Industries Operating Corporation Electronic ignition system with combined output from multiple coils
US4275322A (en) * 1978-03-06 1981-06-23 Outboard Marine Corporation Ignition system with active pulse discriminating means
US4829972A (en) * 1986-12-05 1989-05-16 Piaggio & C. S.P.A. Magnet-flywheel ignition unit for internal combustion engines
US4879486A (en) * 1987-01-21 1989-11-07 Hitachi, Ltd. Permanent-magnet generator used for an ignition device of an internal combustion engine
US5313918A (en) * 1989-09-11 1994-05-24 Sem Ab Flywheel magneto arrangement
US6311662B1 (en) * 2000-05-26 2001-11-06 Earl H. Calhoun Drive adapter for a generator/magneto
US20040016424A1 (en) * 2002-07-27 2004-01-29 Ulf Arens System and method for increasing spark current to spark plugs
US9488150B2 (en) 2011-10-28 2016-11-08 Briggs & Stratton Corporation Ignition system for internal combustion engine
US10634041B2 (en) 2011-10-28 2020-04-28 Briggs & Stratton Corporation Ignition system for internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461851A (en) * 1968-10-07 1969-08-19 Ambac Ind Ignition system and magneto therefor
US3464397A (en) * 1967-01-23 1969-09-02 Ambac Ind Ignition system for internal combustion engines and the like
US3630185A (en) * 1969-02-13 1971-12-28 Bosch Gmbh Robert Ignition-timing apparatus
US3661132A (en) * 1969-12-15 1972-05-09 Tecumseh Products Co Ignition circuit with automatic spark advance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464397A (en) * 1967-01-23 1969-09-02 Ambac Ind Ignition system for internal combustion engines and the like
US3461851A (en) * 1968-10-07 1969-08-19 Ambac Ind Ignition system and magneto therefor
US3630185A (en) * 1969-02-13 1971-12-28 Bosch Gmbh Robert Ignition-timing apparatus
US3661132A (en) * 1969-12-15 1972-05-09 Tecumseh Products Co Ignition circuit with automatic spark advance

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974816A (en) * 1974-07-17 1976-08-17 Colt Industries Operating Corporation Electronic ignition system with combined output from multiple coils
US4275322A (en) * 1978-03-06 1981-06-23 Outboard Marine Corporation Ignition system with active pulse discriminating means
US4829972A (en) * 1986-12-05 1989-05-16 Piaggio & C. S.P.A. Magnet-flywheel ignition unit for internal combustion engines
US4879486A (en) * 1987-01-21 1989-11-07 Hitachi, Ltd. Permanent-magnet generator used for an ignition device of an internal combustion engine
US5313918A (en) * 1989-09-11 1994-05-24 Sem Ab Flywheel magneto arrangement
US6311662B1 (en) * 2000-05-26 2001-11-06 Earl H. Calhoun Drive adapter for a generator/magneto
US20040016424A1 (en) * 2002-07-27 2004-01-29 Ulf Arens System and method for increasing spark current to spark plugs
US6899092B2 (en) * 2002-07-27 2005-05-31 Ulf Arens System and method for increasing spark current to spark plugs
US9488150B2 (en) 2011-10-28 2016-11-08 Briggs & Stratton Corporation Ignition system for internal combustion engine
US10634041B2 (en) 2011-10-28 2020-04-28 Briggs & Stratton Corporation Ignition system for internal combustion engine

Also Published As

Publication number Publication date
IT1001647B (it) 1976-04-30
JPS5761894B2 (ja) 1982-12-27
BR7308701D0 (pt) 1974-08-22
JPS4973539A (ja) 1974-07-16
DE2255396C3 (de) 1978-07-27
DE2255396A1 (de) 1974-05-22
DE2255396B2 (de) 1977-12-01
ES420430A1 (es) 1976-08-01

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