US3864622A - Transistorized control circuit for magneto motor ignition systems - Google Patents

Transistorized control circuit for magneto motor ignition systems Download PDF

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Publication number
US3864622A
US3864622A US384381A US38438173A US3864622A US 3864622 A US3864622 A US 3864622A US 384381 A US384381 A US 384381A US 38438173 A US38438173 A US 38438173A US 3864622 A US3864622 A US 3864622A
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United States
Prior art keywords
ignition
semiconductor device
voltage
diode
control circuit
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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
Application number
US384381A
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English (en)
Inventor
George Haubner
Walter Hofer
Peter Schmaldienst
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority claimed from DE19722242327 external-priority patent/DE2242327C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3864622A publication Critical patent/US3864622A/en
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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
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
    • F02P1/08—Layout of circuits
    • F02P1/083—Layout of circuits for generating sparks by opening or closing a coil circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • This invention concerns an ignition control circuit for a magneto ignition system of an internal combustion engine.
  • a controllable semiconductor device such as a transistor with its switching path in the primary current circuit of an ignition coil, the secondary winding of which is connected by an ignition cable with. at least one spark plug.
  • the invention further relates to transistorized magneto ignition circuits in which thesemiconductor device has its control electrode connected to a control circuit in which a control signal at the proper ignition time switches the semiconductordevice from conducting to nonconducting condition.
  • the primary circuit must be closed anew to make possible the generationof further sparks.
  • the necessary voltage for switching the ignition transistor back to its conducting state can be taken from the battery.
  • the voltage at the output terminals of the magneto generator armature is too small, when the primary circuit is short circuited, to hold the ignition transistor fully in its conducting condition.
  • the ignition transistor is connected in series with a resistor in the primary circuit.
  • the voltage drop across this resistor switches the ignition transistor into its conducting condition and maintains it thus until the time for ignition.
  • the base-emitter path of the ignition transistor is short circuited, in consequence of which the ignition transistor is blocked.
  • a series, circuit containing a capacitor and a diode the diode being connected with polarity opposite to that of the switching path of the semiconductor device in the primary circuit, and the common connection of the capacitor and the diode is connected to the control electrode of the semiconductor device.
  • the connection between its control electrode and the junction of the capacitor and the diode is made by a resistor.
  • the semiconductor device in the primary circuit is preferably a power transistor.
  • the primary current circuit is therefore directly short circuited by the ignition transistor and a strong primary current can flow and there is no need to insert any resistors in the primary circuit to provide the control voltage for the transistor.
  • the build-up of current is therefore not limited appreciably by control circuitcomponents.
  • FIG. I is a circuit diagram of a transistorized magneto ignition system according to the invention.
  • FIG. 2 is a timing diagram showing the course of currents and voltages in the control circuit of the transistor and in the primary circuit of the ignition system shown in FIG. 1.
  • FIG. I shows an ignition system for a one-cylinder gasoline engine provided with a magneto generator 10 the armature ll of which is provided with a two-part winding 12, which at the same time provides the ignition coil of the ignition system.
  • the secondary winding 12a of the magneto armature 11 is connected by an ignition cable 14 with a spark plug 15;
  • the primary winding 12b of the armature I1 is connected in a primary current circuit in which the collector-emitter path of an ignition transistor 16 also lies.
  • the transistor 16 is an NPN power transistor, and its emitter connection is grounded to the vehicle chassis or the engine casing, as is also one end of the primary winding 12h. That winding is bridged by a series combination of a capacitor I7 and a diode I8, the polarization of which is opposite to that of the collector-emitter path of the ignition transistor 16.
  • the common connection 19 of the capacitor 17 and the diode I8 is connected to a resistor 20, the other end of which is connected to the base of the ignition transistor 16, where a further control circuit is also connected comprising a control transistor 21 arranged with its collector-emitter path parallel to the base-emitter path of the ignition transistor 16.
  • a magnetic pulse generator 22 provides the timing of the spark, and for that purpose its output is connected across the base-emitter path of the control transistor 21.
  • the base of the control transistor 21 is, furthermore, connected over a resistor 23 with the grounded end of the primary winding 12b and also connected over a coupling resistor 24 with the other (ungrounded) end of the primary winding 12b.
  • the primary winding 12b is. furthermore bridged by a negative peak reducing device 25 that operates during negative voltage half waves in the primary circuit.
  • the negative peak reducing device 25 contains a diode 26 in series with a Zener diode 27. The diode 26 is poled opposite to the polarity of the collector-emitter path -of the ignition transistor 16.
  • Zener diode 27 is so poled that when the Zener voltage is reached, current will pass over the diode 26 and the Zener diode 27 and cause the negative peak voltage in the primary circuit to be limited.
  • a second diode 28 is interposed in the primary circuit, poled for conduction on positive voltage half waves.
  • Relative to the axis an; are shown the course of the primary voltage U,,, by a dashed line, and that of the primary current l,,, by a solid line.
  • Relative to the axis w are shown the base voltage U,, of the transistor 16, by a dashed line, and the base current l,, of the transistor 16, as a solid line, as well as the charge voltage U of the capacitor 17, by a dotted line.
  • the permanent magnet 13a of the magnetic rotor 13 When the gasoline engine is running, the permanent magnet 13a of the magnetic rotor 13 is rotated so as to move past the stationary armature ll of the magneto, producing an alternation of negative and positive voltage half waves.
  • the output voltage When a negative voltage half wave is induced in the primary winding 12b of the armature 11, the output voltage is limited to the Zener voltage of the Zener diode 27, for when the latter conducts it provides a conducting bridge over the diode 26 across the primary winding terminals.
  • the capacitor 17 is accordingly charged over the diode 18 to the voltage of the negative half wave as limited by the Zener diode 27.
  • the diode 18 conducts while the capacitor 17 charges, so that the voltage provided to the base ofthe transistor is essentially the reference chassis voltage.
  • the diode 18 stops conducting and the voltage of the junction 19 goes positive, continuing to go more positive as the end of the negative half wave gives way to the succeeding positive half wave.
  • the voltage of the junction 19 is communicated to the base of the transistor 16 over the resistor 20. Consequently, at the end of the negative voltage half wave the capacitor voltage U, becomes effective as the base voltage U between the base and the emitter of the ignition transistor 16.
  • the positive half wave of the primary winding 12b of the armature comes on, the positive voltage is superimposed on the capacitor voltage U so that the base voltage U is further increased.
  • This base voltage U gives rise to a base current I which puts the ignition transistor 16 fully in its conducting condition, so that the primary circuit of the magneto is practically short circuited
  • the primary current l rises to a peak value and builds up astrong magnetic field in the armature 11.
  • the base voltage U does not rise much because of the voltage drop in the resistor 20 resulting from the base current.
  • a voltage pulse is produced by the magnetic pulse generator 22, which raises the base of the control transistor 21 to a positive potential and thereby switches the control transistor 21 to its conducting condition.
  • the base-emitter path of the ignition transistor 16 is thus short circuited, and the base voltage U, according, collapses. lnconsequence, the base current l,, is switched off, and at the same time the capacitor 17 discharges over the resistor 20 and the collector-emitter path of the control transistor 21.
  • the ignition transistor 16 is immediately blocked by the switching off of the base current l,,. as the result of which the primary current l,, is interrupted.
  • the magnetic field in the armature 12 now collapses and thereby induces a high voltage pulse in the secondary winding 12a, which sets offa spark in the spark plug 15.
  • the coupling resistor 24 provides this assurance, as well as an accelerated switching over of the control transistor 21.
  • the coupling resistor 24 transmits the rise of the primary voltage to the base of the control transistor 21, and thereby holds that transistor in its conducting condition even if the control pulse provided by the pulse transmitter 22 has already dropped off. Only at the end of the positive half wave of the primary voltage U, does the control transistor 21 regain its nonconducting condition by virtue of the connection of the resistor 23 between base and emitter.
  • the capacitor 17 can be recharged. The ignition cycle and the charging up of the capacitor 17 repeats with each full revolution of the magnetic rotor 13.
  • the invention has been described with respect to a particular illustrative embodiment, it is not limited thereto but also includes circuits in which particular components are differently constituted. What is important is that when the positive voltage half wave arises in the primary circuit, the semiconductor device inthe primary circuit must be switched fully on during the entire portion of the cycle to the time of ignition, because the control voltage for the semiconductor device is so greatly increased by the series addition of the primary voltage and the voltage of the previously charged capacitor that even at low speeds of the engine, and hence of the magneto rotor 10, a sufficient switching on of the semiconductor device is obtained.
  • control transistor 21 could be replaced by a semiconductor controlled rectifier (SCR, sometimes called a thyristor), an SCR tetrode or a triac, in which case the coupling provided by the voltage divider constituted by the resistors 24 and 23 could be dispensed with. It is also possible to provide bridging of less than the entire primary winding 12b of the armature 11 by the capacitor 17 and the diode 18, or likewise by the negative peak limiting circuits 25. A further change of the circuit of FIG. 1 within the concept of the present invention is to use an ignition coil separate from the armature 11 arranged at another point in the primary circuit.
  • SCR semiconductor controlled rectifier
  • Such a separate ignition coil is an equivalent of double-winding of the armature with a low-voltage and a high-voltage winding, the purpose in each case being to derive a high voltage from the interruption .of a heavy current in a low-resistance circuit operating at low voltage by the well-known transformer step-up effet.
  • the switching path of the first semiconductor device 16 is interposed in the primary circuit so that when it is in its conducting condition a heavy current flows through said primary circuit as the result of the voltage induced in the low voltage armature winding, and when the switching path of the first semiconductor device 16 is suddenly put into its nonconducting condition, the current in the primary circuit, and hence in the low voltage coil of the spark coil, is interrupted and the collapse of the magnetic field of the spark coil, whether the spark coil be built into the magneto generator or separate, induces a high voltage in the high voltage winding.
  • the high voltage winding is herein regarded as a voltage step-up means coupled with the magneto armature.
  • an internal combustion engine ignition system having a magneto armature provided with at least one winding arranged to be excited by a magnetized rotor driven by the engine, and having voltage step-up means coupled with said magneto armature, which means is coupled with a low-voltage winding of said armature and connected by ignition cable to at least one spark plug, said ignition system having also a spark-timing pulse generator operated in synchronism with said 'engine,
  • an ignition control circuit for connection to said lowvoltage winding of said armature, comprising:
  • controllable semiconductor device having a switching path and a control path and having its switching path in circuit with said low-voltage winding and its control path in a control circuit;
  • a resistively conductive connection between said ,which the resistively conductive connection between said common connection (19) of said capacitor (17) and said diode (l8) and said control electrode of said semiconductor device (16) includes a resistor (20) through which said connection is effected.
  • An ignition control circuit as defined in claim 2 in which a second controlled semiconductor device (21) is provided in the control circuit of said first semiconductor device (16), with its switching path connected in parallel to the control path of said first semiconductor device (16).

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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)
US384381A 1972-08-29 1973-07-31 Transistorized control circuit for magneto motor ignition systems Expired - Lifetime US3864622A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722242327 DE2242327C3 (de) 1972-08-29 Zündanlage für Brennkraftmaschinen mit einem Zündanker

Publications (1)

Publication Number Publication Date
US3864622A true US3864622A (en) 1975-02-04

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ID=5854804

Family Applications (1)

Application Number Title Priority Date Filing Date
US384381A Expired - Lifetime US3864622A (en) 1972-08-29 1973-07-31 Transistorized control circuit for magneto motor ignition systems

Country Status (13)

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US (1) US3864622A (sv)
JP (2) JPS5612704B2 (sv)
AT (1) AT323472B (sv)
AU (1) AU476951B2 (sv)
BE (1) BE804116A (sv)
BR (1) BR7306580D0 (sv)
CA (1) CA986573A (sv)
ES (1) ES418240A1 (sv)
FR (1) FR2198549A5 (sv)
GB (1) GB1446320A (sv)
IT (1) IT993045B (sv)
SE (1) SE384718B (sv)
YU (1) YU35390B (sv)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163437A (en) * 1975-10-23 1979-08-07 Solo Industries Pty. Limited Transistor ignition circuit
US4175509A (en) * 1977-01-18 1979-11-27 Robert Bosch Gmbh Magneto ignition system for an internal combustion engine
US4270509A (en) * 1978-03-10 1981-06-02 Briggs & Stratton Corporation Breakerless ignition system
US4395981A (en) * 1979-05-23 1983-08-02 Robert Bosch Gmbh Magneto-semiconductor ignition system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5070341U (sv) * 1973-10-30 1975-06-21
JPS5832175U (ja) * 1981-08-26 1983-03-02 田中工業株式会社 内燃機関用点火回路
JPS5940721U (ja) * 1982-09-07 1984-03-15 松下電器産業株式会社 加熱調理器
JPS62100979A (ja) * 1985-10-28 1987-05-11 松下電器産業株式会社 高周波加熱装置
JPS62108492A (ja) * 1985-11-05 1987-05-19 松下電器産業株式会社 高周波加熱装置
JPH0271231A (ja) * 1988-09-06 1990-03-09 Nikon Corp カメラの電源装置
JPH049928U (sv) * 1990-05-17 1992-01-28

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484677A (en) * 1966-03-03 1969-12-16 Phelon Co Inc Breakerless magneto ignition system
US3496920A (en) * 1968-03-06 1970-02-24 Motorola Inc Flywheel generator for charging the capacitor of a capacitor discharge ignition system
US3504373A (en) * 1967-05-09 1970-03-31 Bosch Gmbh Robert Breakerless ignition system with magneto supply and transistor controls
US3750637A (en) * 1971-09-07 1973-08-07 F Minks Alternator-rectifier electronic charging and discharging apparatus for ignition systems and the like

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1390629A (fr) * 1964-04-01 1965-02-26 Lucas Industries Ltd Magnéto
FR2067679A5 (sv) * 1969-11-13 1971-08-20 Plessey Co Ltd

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484677A (en) * 1966-03-03 1969-12-16 Phelon Co Inc Breakerless magneto ignition system
US3504373A (en) * 1967-05-09 1970-03-31 Bosch Gmbh Robert Breakerless ignition system with magneto supply and transistor controls
US3496920A (en) * 1968-03-06 1970-02-24 Motorola Inc Flywheel generator for charging the capacitor of a capacitor discharge ignition system
US3750637A (en) * 1971-09-07 1973-08-07 F Minks Alternator-rectifier electronic charging and discharging apparatus for ignition systems and the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163437A (en) * 1975-10-23 1979-08-07 Solo Industries Pty. Limited Transistor ignition circuit
US4175509A (en) * 1977-01-18 1979-11-27 Robert Bosch Gmbh Magneto ignition system for an internal combustion engine
US4270509A (en) * 1978-03-10 1981-06-02 Briggs & Stratton Corporation Breakerless ignition system
US4395981A (en) * 1979-05-23 1983-08-02 Robert Bosch Gmbh Magneto-semiconductor ignition system
US5056481A (en) * 1979-05-23 1991-10-15 Robert Bosch Gmbh Magneto-semiconductor ignition system

Also Published As

Publication number Publication date
BR7306580D0 (pt) 1974-06-27
JPS4964729A (sv) 1974-06-22
YU215073A (en) 1980-06-30
DE2242327B2 (de) 1977-03-24
FR2198549A5 (sv) 1974-03-29
GB1446320A (en) 1976-08-18
JPS56113045A (en) 1981-09-05
AU5970773A (en) 1975-03-06
IT993045B (it) 1975-09-30
AT323472B (de) 1975-07-10
JPS5612704B2 (sv) 1981-03-24
YU35390B (en) 1980-12-31
AU476951B2 (en) 1976-10-07
BE804116A (fr) 1973-12-17
JPS5938430B2 (ja) 1984-09-17
DE2242327A1 (de) 1974-03-21
CA986573A (en) 1976-03-30
SE384718B (sv) 1976-05-17
ES418240A1 (es) 1976-03-16

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