US3704700A - Ignition arrangement for internal combustion engines having an alternating current generator - Google Patents

Ignition arrangement for internal combustion engines having an alternating current generator Download PDF

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Publication number
US3704700A
US3704700A US106674A US3704700DA US3704700A US 3704700 A US3704700 A US 3704700A US 106674 A US106674 A US 106674A US 3704700D A US3704700D A US 3704700DA US 3704700 A US3704700 A US 3704700A
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United States
Prior art keywords
capacitor
impedance
arrangement
voltage
generator
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Expired - Lifetime
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US106674A
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English (en)
Inventor
Jurgen Wesemeyer
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Robert Bosch GmbH
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Robert Bosch GmbH
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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

Definitions

  • ABSTRACT Shunted across the charging winding of the alternating current generator is an impedance and a spark discharge capacitor connected in series.
  • a thyristor is Jan. 20, 1970 Germany ...P 20 02 310.3 connected to Permit discharge of the capacitor through the primary winding of the spark core when [52] U.S. Cl ..123/148 E, 123/149 R the thyri is n ti th ntr l el tr de of [51] Int.
  • the invention relates to an ignition arrangement for internal combustion engines, the arrangement having a spark discharge capacitor that is charged by the alternating current generator and discharged, at the ignition point, through the primary of the spark plug, by an electronic switch.
  • the prior'art also discloses circuits for connecting the control electrode of a' thyristor to a pulse generator having magnets, the pulse generator delivering a voltage pulse at the ignition point to trigger the thyristor.
  • An object of the invention is an ignition arrangement that solves, in a very simple manner, the problem of obtaining the triggering voltage from the charging circuit and conducting this voltage to the control electrode of the electronic switch at the desired time.
  • the invention consists essentially of an alternating current generator, a capacitor connected to the alternating current generator to be charged thereby, a spark coil having a primary winding and a secondary winding, the latter winding being connected to at least one spark plug, electronic switch means triggered into conductivity by a control voltage, the electronic switch means being connected between the capacitor and the primary winding so that when the electronic switch means is conductive the capacitor is free to discharge through the primary winding to induce in the secondary winding a voltage pulse sufficient to spark the plug, and impedance means connected in series with the capacitor for causing a voltage gap, that is, the control voltage, the resistive-or the reactive component of the impedance means having any value including zero.
  • FIG. 1 is a circuit diagram of the ignition arrangement of the invention
  • FIG. 2 is a vector diagram showing the phase relationships between the charging current and the voltages across the capacitor, the impedance, and the charging winding;
  • FIG. 3 shows the time relationships of the current and of the voltages of the vector diagram of FIG. 2.
  • the ignition arrangement of the invention is energized by an alternating current generator 10, in the charging winding 1 1 of which there is induced analternating voltage by the rotation of a bar having permanent magnets, the bar 12 being driven by the internal combustion engine, not shown.
  • a lead 13 connects one end of the charging winding 11 to one plate of a spark discharge capacitor 14 and to respective ends of the primary winding 15 and the secondary winding 16 of a spark coil 17.
  • a spark plug wire 18 connects the other end of the secondary winding to a spark plug 19.
  • a lead 20 connects the other end of the primary winding 15 to the anode of a thyristor 21, which latter acts as an electronic switch.
  • the cathode of the thyristor is connected by a lead 25 to the junction between the capacitor 14 and an impedance 22, the impedance .and the capacitor being connected in series.
  • Components 20, 21 and 25 constitute discharge current path means connecting capacitor 14 with primary winding 15.
  • a lead 23 connects the series connected impedance and capacitor to the other end of the charging winding 11.
  • the triggering voltage for the control electrode 26 of the thyristor is conducted by a lead 24, connected between the control electrode and the end of the impedance remote from the capacitor.
  • FIG. 2 is a vector diagram of the current and voltages in the charging circuit. It will be assumed that the instantangeous positive value of the voltage U induced in the winding 11 is 150' volts, that the resistance of the impedance 22 is approximately 50 ohms, and that the capacitor 14 is l microfarad. With these assumptions, the charging current I of approximately 200 milliamperes leads the voltage U by approximately 82". The voltage drop U across the impedance 22 is approximately 10 volts and is in phase with the current I The voltage U across the capacitor 14 is approximately 148 volts, and it lags the voltage U by and the voltage U by 8.
  • the spark discharge capacitor i4 is charged and discharged at the frequency of the alternating voltage U induced in the charging winding 11. In order to assure a maximum voltage at the sparkplug 19 it is essential that the capacitor is discharged as nearly as possible when the capacitor voltage U is at its maximum positive value. This condition is ensured by using, for the thyristor triggering voltage, the negative part of the voltage U across the impedance 22.
  • the current and voltages in the charging circuit are plotted along the upper time axis and the thyristor triggering voltage U, is plotted along the lower time axis t Since thetriggering voltage U, is measured from the cathode of the thyristor, it is the negative of the voltage U As FIG.
  • FIG. 3 shows, at this moment the voltage U,, across the capacitor. 14 has fallen very little from its peak value, so that very nearly the maximum possible amount of stored electrical energy is discharged through the thyristor 21 and the primary winding 15 of the spark plug".
  • the highvoltage induced in the secondary 16 causes a first spark at the spark plug 19 Since a positive voltage U is induced in the charging winding 11 at the moment capacitor 14 begins to discharge, the latter is immediately recharged after being discharged and then again discharged during a secondary firing Nz thereby producing one or more sparks of rapidly decreasing energy, at the plug 19.
  • This charging and discharging of .the capacitor 14 is repeated during each period of the .voltage, induced in the charging winding 11; the ignition occurs at the frequency of the generator, which frequency is dependent on' the motor rpm.
  • the impedance 22 is a voltage dependent component, inorder to avoid exceeding the maximum permissible triggering voltage at high speeds of the internal combustion engine. As shown in FIG. 1, the impedance 22 can be made adjustable to enable shifting of the ignition point independence on the motor rpm or the motor load.
  • the resistive or reactive component of the impedance can have any value including zero.
  • the reactive component can be inductive and/or capacitive.
  • the impedance 22 can be used as the impedance 22.
  • the capacitor 14, thyristor 21, and the impedance 22 are advantageous to construct as a replaceable subunit. With this in view, the lead 13 can be omitted, and the respective terminals of the charging winding 11, capacitor 14, primary 15, and secondary 16 connected to ground.
  • Anignition arrangement adapted to activate at least one spark plug of an internal combustion engine, comprising, in combination ignition capacitor means; A.C. generator means; capacitor current path means connecting said generator means with said capacitor means for supplying alternating current thereto; transformer means'having a primary winding and a secondary winding; discharge current path means connecting said capacitor means with said primary winding and including electronic switch.
  • said switch means comprising thyristor means having a gate and a cathode together constituting said control electrode means.
  • An ignition arrangement as defined in claim 1 wherein said generator means includes a charging winding, said series connected capacitor and impedance means being connected in parallel with said 11.

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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)
US106674A 1970-01-20 1971-01-15 Ignition arrangement for internal combustion engines having an alternating current generator Expired - Lifetime US3704700A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702002310 DE2002310A1 (de) 1970-01-20 1970-01-20 Zuendanlage fuer Brennkraftmaschinen mit Wechselstromgenerator

Publications (1)

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US3704700A true US3704700A (en) 1972-12-05

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US106674A Expired - Lifetime US3704700A (en) 1970-01-20 1971-01-15 Ignition arrangement for internal combustion engines having an alternating current generator

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US (1) US3704700A (enExample)
DE (1) DE2002310A1 (enExample)
ES (1) ES387143A1 (enExample)
FR (1) FR2075066A5 (enExample)
SE (1) SE377599B (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747582A (en) * 1971-03-06 1973-07-24 Nippon Denso Co Ignition system for multicylinder internal combustion engine
US3809043A (en) * 1971-10-22 1974-05-07 Nippon Denso Co Contactless ignition system for internal combustion engines
US3866589A (en) * 1972-03-10 1975-02-18 Bosch Gmbh Robert Semiconductor controlled magneto ignition system for internal combustion engines
US3874354A (en) * 1972-12-14 1975-04-01 Syncro Corp Ignition adapter circuit
US3933140A (en) * 1973-07-25 1976-01-20 Syncro Corporation Capacitive discharge ignition adapter
US3941111A (en) * 1973-09-10 1976-03-02 Syncro Corporation Ignition system
US4029998A (en) * 1975-03-03 1977-06-14 Mcculloch Corporation Capacitor discharge ignition circuit
US4108131A (en) * 1975-09-05 1978-08-22 Hitachi, Ltd. Capactive discharge ignition circuit
US4188929A (en) * 1976-08-17 1980-02-19 Robert Bosch Gmbh Internal combustion engine magneto-type ignition system with electronically controlled spark advance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6945140B2 (en) 2003-08-21 2005-09-20 Black & Decker Inc. Automatic screwfeeder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3357415A (en) * 1965-10-07 1967-12-12 Gen Motors Corp Capacitor discharge ignition system
US3367314A (en) * 1964-09-16 1968-02-06 Honda Gijutsu Kenkyusho Kk Non-contact ignition device
US3500809A (en) * 1967-05-09 1970-03-17 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3542007A (en) * 1966-11-03 1970-11-24 Brunswick Corp Alternator driven capacitor discharge ignition system
US3545420A (en) * 1968-11-27 1970-12-08 Motorola Inc Capacitor discharge ignition system
US3599615A (en) * 1969-05-29 1971-08-17 Motorola Inc Spark advance mechanism for solid state ignition systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367314A (en) * 1964-09-16 1968-02-06 Honda Gijutsu Kenkyusho Kk Non-contact ignition device
US3357415A (en) * 1965-10-07 1967-12-12 Gen Motors Corp Capacitor discharge ignition system
US3542007A (en) * 1966-11-03 1970-11-24 Brunswick Corp Alternator driven capacitor discharge ignition system
US3500809A (en) * 1967-05-09 1970-03-17 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3545420A (en) * 1968-11-27 1970-12-08 Motorola Inc Capacitor discharge ignition system
US3599615A (en) * 1969-05-29 1971-08-17 Motorola Inc Spark advance mechanism for solid state ignition systems

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747582A (en) * 1971-03-06 1973-07-24 Nippon Denso Co Ignition system for multicylinder internal combustion engine
US3809043A (en) * 1971-10-22 1974-05-07 Nippon Denso Co Contactless ignition system for internal combustion engines
US3866589A (en) * 1972-03-10 1975-02-18 Bosch Gmbh Robert Semiconductor controlled magneto ignition system for internal combustion engines
US3874354A (en) * 1972-12-14 1975-04-01 Syncro Corp Ignition adapter circuit
US3933140A (en) * 1973-07-25 1976-01-20 Syncro Corporation Capacitive discharge ignition adapter
US3941111A (en) * 1973-09-10 1976-03-02 Syncro Corporation Ignition system
US4029998A (en) * 1975-03-03 1977-06-14 Mcculloch Corporation Capacitor discharge ignition circuit
US4108131A (en) * 1975-09-05 1978-08-22 Hitachi, Ltd. Capactive discharge ignition circuit
US4188929A (en) * 1976-08-17 1980-02-19 Robert Bosch Gmbh Internal combustion engine magneto-type ignition system with electronically controlled spark advance

Also Published As

Publication number Publication date
SE377599B (enExample) 1975-07-14
DE2002310A1 (de) 1971-08-12
FR2075066A5 (enExample) 1971-10-08
ES387143A1 (es) 1973-05-01

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