US3612023A - Ignition arrangement for internal combustion engines - Google Patents

Ignition arrangement for internal combustion engines Download PDF

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Publication number
US3612023A
US3612023A US838423A US3612023DA US3612023A US 3612023 A US3612023 A US 3612023A US 838423 A US838423 A US 838423A US 3612023D A US3612023D A US 3612023DA US 3612023 A US3612023 A US 3612023A
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United States
Prior art keywords
ignition
engine
internal combustion
magnetic
capacitor
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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
US838423A
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English (en)
Inventor
Gerhard Sohner
Gert Strelow
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Priority claimed from DE19681764609 external-priority patent/DE1764609C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3612023A publication Critical patent/US3612023A/en
Anticipated expiration legal-status Critical
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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

  • a magnetic member driven by the engine induces the charging voltage within a charging coil and, moreover, induces a control voltage within another coil for controlling an electronic switch.
  • the capacitor discharges through the primary winding of an ignition transformer to generate a voltage for firing the spark plugs. Ignition of the fuel-air mixture is inhibited when the en gine is rotating in the wrong direction.
  • Such ignition arrangements find utility when no battery is available for energizing the ignition arrangement.
  • the secondary winding of the ignition transformer receives a high-voltage pulse with steep rising edge at the instant of ignition.
  • the control for the ignition process can, thereby, be carried out without the use of mechanical switches which become readily soiled through pitting and oil coatings. Such mechanical switches, therefore, interfere with unobstructed operation of the ignition arrangement.
  • an object of thepresent invention to provide an ignition arrangement, in accordance with the aforementioned design, in which the internal combustion engine cannot rotate in the incorrect direction.
  • This object is achieved through the present invention by providing that the ignition capacitor which is charged through a charging coil, will not discharge at the instant of time for carrying out an ignition process, when the engine rotates in the wrong direction.
  • a control voltage for turning on an electronic discharge switch is generated through inductive effects upon a control winding for compressed mixtures.
  • An ignition arrangement for internal combustion engines in which a capacitor is charged to a level where it can provide the ignition voltage necessary for generating a spark across the spark plugs.
  • a charging coil has a voltage induced within it through a rotating magnetic system, and this voltage is used -to charge the capacitor.
  • the capacitor Upon triggering of a controlled electronic switch, the capacitor is discharged through the primary winding of an ignition transformer. As a result of such discharge, a high-voltage pulse is induced within the'secondary winding of the ignition transformer, and the spark plug is thereby'fired.
  • the controlled electronic switch is triggered through a control voltage induced within a control coil also influenced by the magnetic system which is moved past this control coil.
  • the control'voltage is induced through rotation of the magnetic system so'that when the engine is rotating in the wrong direction, ignition of the fuel-air mixture within the engine is inhibited.
  • Such inhibition'of the ignition of the mixture is accomplished by providing bypass circuitry in parallel with the ignition capacitor for discharging the latter appropriately to assure that the ignition energy will not be available at the firing instant, when the engine is rotating in the wrong direction.
  • a discshaped magnetic system 1 is driven by the crankshaft of an internal combustion'engine, not shown, while the latter is in operation.
  • the disc-shaped magnetic system 1 has at least one north-pole segment N, as well as one south-pole segment S at the rim.
  • a charging coil 2 which is stationary, and an equally stationary control winding 3 are influenced as a result of the inductive coupling between these coils and the rotating member 1.
  • the charging'coil 2 is mounted upon an E-shaped ferromagnetic core 4, which has its poles 5, 6, 7 facing the magnetic system 1.
  • the secondary winding 14 of the ignition transformer 12 is connected in series with a spark plug 15, and the series combination of this spark plug 15 and the secondary winding'l4 is connected between the ground potential connection 8 and the junction of the primary winding 11 and the discharged switch
  • the electronic discharged switch 13 may be in the form of, for example, a thyristor which has a control electrode G connected to the cathode of a diode 16.
  • the anode of this diode I6 is connected to one terminal of the control winding 3.
  • the other terminal of the control winding 3 is connected to ground potential through the ground connection 8.
  • the control winding 3 is mounted upon a U-shaped magnetic core 17 which has poles 18, 19 facing the magnetic system 1.
  • the control winding 3 has an AC voltage induced within it.
  • This AC voltage reaches with its positive half wave, the control electrode G of the electronic discharge switch 13, by way of the diode 16.
  • the circuit path A-K of the discharge switch 13 is thereby made conductive, and the ignition capacitor 10 discharges through the primary winding 11 of the ignition transformer 12. Due to such discharge of energy through the primary winding II, a high-voltage impulse is induced in the secondary winding 14 of the ignition transformer I2, and this induced high-voltage pulse causes an electrical discharge across the electrodes of the spark plug IS.
  • the preceding precautionary means or step may be realized through corresponding design of the magnetic system I in relation to the control winding 3 which is inductively influenced by the system I.
  • the influencing effect is such that when the magnetic system I moves past the poles l8 and 19 of the ferromagnetic core 17, a positive half wave voltage is induced within the control winding 3.
  • This induced voltage has a minimum control voltage magnitude for turning on the electronic discharge switch 13, and is of positive polarity.
  • the peak value of this induced voltage has the minimum value required for turning on the discharge switch 13, whereas the induced voltage is below this required minimum value when the engine rotation is in wrong direction.
  • the auxiliary discharge resistor 20 is chosen so that the capacitor 10 can discharge after charging with a time constant by which the charge is sufficient for ignition with correct rotation of the engine, at the instant that a control voltage appears within the control winding 3. In the wrong direction of the engine, however, the capacitor charge is insufficient to carry out an ignition process.
  • a regulating arrangement 21 which is designated in the drawing with dashed lines, and which functions in relation to the rotational speed of the engine.
  • the regulating arrangement 2] adjusts the value of the resistor 20, so that the ohmic value of the auxiliary discharge resistor 20 decreases with increase in speed of the engine.
  • the resistor 22 functions as a protective resistor.
  • the auxiliary switch 23 is controlled so that when the engine rotates in the wrong direction, so that this switch 23 conducts prior to the conduction of the discharge switch 13, after charging of the ignition capacitor 10.
  • a resistor 24 is connected in series with the control path G-K' of the electronic switch 23. This resistor 24 is, furthermore, connected to an auxiliary winding 25 which becomes influenced by the magnetic system 1 prior to the instant at which the control winding 3 becomes influenced, when the engine rotates in the wrong direction.
  • the ignition arrangement of FIG. 4 differs from that disclosed in FIG. 3, through the feature that the electronic auxiliary switch 23 is an NPN transistor which is controlled through a magnetic-field-dependent semiconductor element 29 which may be in the form of a field plate.
  • This magneticfield-dependent semiconductor element 29 forms a voltage divider in conjunction with a scaling resistor 30.
  • This voltage divider is, in turn, connected in parallel with the ignition capacitor l0, and has a junction or tap 31 connected to the control electrode G of the electronic auxiliary switch 23.
  • the magnetic-field-dependent semiconductor element 29, furthermore, forms an arrangement with a yoke 32 made of magnetic material and which has poles 33 and 34 directed toward the magnetic system I. In the wrong direction of rotation of the engine, these poles 33 and 34 lie between the ferromagnetic core 4 of the charging coil 2, and the core 17 of the control coil 3 associated with the magnetic system 1.
  • FIG. 5 The ignition arrangement of FIG. 5 is equivalent, in principle, to the arrangement shown in FIG. 1. Accordingly, identical reference numerals are assigned to the circuit elements which have the same functional operation and the same task from the circuit point of view. The description provided with the basic functional operation for FIG. 1, furthermore, applies here, to FIG. 5, also.
  • One difference of this embodiment compared to that of FIG. 1, resides in the condition that the poles 18 and 19 of the ferromagnetic core 17 are uniformly spaced from the magnetic system 1. Aside from this, the electronic" conducts positively directed current, and which is connected to the control electrode G of the discharge switch 13.
  • the auxiliary winding 35 is mounted upon a U-shaped ferromagnetic core 37 which has two poles 38 and 39 directed toward the magnetic system I.
  • the ferromagnetic core 37 is situated somewhat beneath the dead center of the piston head.
  • FIG. 6 The ignition arrangement disclosed in FIG. 6 resides upon the same principle which applies to FIG. 1.
  • the basic description for the functional operation of FIG. 1 also applies to the arrangement of FIG. 6.
  • the difference between the em-' bodiment of FIG. 6 and that of FIG. 1 resides in the feature that a control voltage is generated for switching or turning on the electronic discharge switch 13, through corresponding inductive effect upon the control winding 3 for both compressed fuel-air mixture, as well as fuel-air mixture which has not, as yet, been compressed.
  • the constructional design of the magnetic members 42 and 43 in conjunction with the magnetic system 1 is such that the path of motion of the inductively functioning parts 44 of the members 42 and 43, occurs only past the frontal ends of the yoke 41 carrying the control winding 3. At the same time, the path of motion of the poles N and S of the magnetic system 1 are brought past only the frontal ends of the poles 5, 6 and 7 of the ferromagnetic core 4 carrying the charging coil 2.
  • the inductively operating parts 44 of the magnetic members 42 and 43 are, for this purpose, raised from the plane of the yoke 41 carrying the control winding 3, and are preferably magnetically isolated therefrom.
  • the magnetic poles N and S of the magnetic system 1 move relative to the ferromagnetic core 4 carrying the charging coil 2.
  • the poles N and S of the magnetic system 1 do not exercise any undesired effect upon the control winding 3 when moving past the yoke 41.
  • the ferromagnetic core with its charging coil 2 does not interfere with the motion of the magnetic members 42 and 43. it is also possible to achieve this situation by arranging the magnetic members 42 and 43 on the frontal edge of the magnetic system 1 with smaller spacing from the center point, than the poles N and S of the magnetic system 1.
  • the yoke 41 carrying the control winding 3 has its pole ends directed toward the path of motion of the magnetic members 42 and 43.
  • This highvoltage pulse produces a spark across the electrodes of the spark plug 15.
  • the occurrence of such a spark takes place at the instant of time that the fuel-air mixture is substantially maximum compressed.
  • the pistonhead would be located, under these conditions, shortly before the upper dead center position. lf, thereupon, the magnetic member 43 moves past the yoke 41, a control voltage is generated for turning on the discharge switch 13.
  • Such control voltage remains ineffective because at that instant of time that this control voltage is generated, the ignition capacitor 10 has not again become charged. During the operation of the internal combustion engine, thereby, these ignition processes are repeated in the manner described above.
  • the magnetic system 1 rotates in the direction opposite to that designated by the arrow p.
  • the magnetic member 43 moves past the yoke 41 carrying the control winding 3.
  • the discharge switch 13 is transferred to conducting state at that instant of time, and the ignition spark is produced in the manner described above.
  • the position of the magnetic member 43 on the magnetic system 1 is established, for example, at the lower dead center position of the pistonhead within the cylinder of the engine. ln this position, no effective ignition of the fuel-air mixture can take place. As a result, the operation of the engine in the wrong direction is inhibited. As a result of the remaining kinetic energy of the pistonhead, additional fuel-air mixture within the cylinder becomes compressed. Furthermore, a control voltage suitable for turning on the discharge switch 13 becomes induced, at the correct instant of time, within the control winding 3, as a result of the motion of the magnetic member 42 past the yoke or core 41. However, no ignition of the mixture within the cylinder can take place, because the ignition capacitor 10 has already been discharged. Any further operation of the engine in the wrong direction is, thereby, avoided.
  • the secondary winding circuit contains a plurality of spark plugs.
  • the ignition pulse can be transmitted to the spark plugs in proper sequence through a conventional ignition distributor.
  • the magnetic system 1 can, under these conditions be driven at the correspondingly correct angular velocity, through a linkage arrangement. At the same time, the proper speed for the magnetic system 1 can be obtained through its inherent design.
  • the ferromagnetic cores 4, 17, 26, 32, 37 and 41 can also be moved through the engine and be set into rotation by being arranged upon a pot-shaped magnetic system, whereby they are constructed in the form of fibrous annatures.
  • An ignition arrangement for an internal combustion engine comprising, in combination, ignition capacitor means; charging coil means connected to said ignition capacitor means to charge the latter; controlled electronic switch means for discharging said ignition capacitor means; ignition transformer means with primary winding connected in series with said switch means, said seriesconnected primary winding and switch means being connected to said capacitor means so that the latter can discharge through said primary winding when said switch means conducts; spark plug means connected to the secondary winding of said transformer; control coil means for applying a brief control voltage of predetermined polarity to said controlled electronic switch means so as to render the latter conductive when the engine is adjacent top dead center; whereby said capacitor means can discharge through said primary winding of said ignition transformer means; magnetic means for periodically inducing in said charging coil means a charging current and for briefly inducing in said control means said control voltage when the engine is adjacent top dead center, said charging current occurring before said control voltage when the engine is turning in a predetermined direction; and means, effective when the engine rotates opposite to said predetermined direction, for at least partly short circuiting said capacitor means after the latter is charged but
  • said means for at least partly short circuiting said capacitor means includes discharge resistor means shunted across said ignition capacitor means for discharging said ignition capacitor means with a predetermined time constant, the time interval between charging of said ignition capacitor means and inducing said control voltage within said control coil means being substantially smaller when the engine rotates in said predetermined direction than when the engine rotates opposite to said predetermined direction, said ignition capacitor means being substantially fully charged at the instant of inducing said control voltage when the engine rotates in said predetermined direction, said ignition capacitor means being substantially discharged at the instant of inducing said control voltage when the engine rotates opposite to said predetermined direction, whereby the charge of said ignition capacitor means is insufficient for ignition when the engine rotates opposite to said predetermined direction.
  • said means for at least partly short circuiting said capacitor means include auxiliary electronic switch connected in parallel with said ignition capacitor means for discharging said ignition capacitor means prior to actuation of said controlled electronic switch means by said induced control voltage when said engine rotates opposite to said predetennined direction.
  • said maGnetic means moves relative to said charging coil means and said control coil means for inducing said voltages within these two coil means, and further including magnetically dependent semiconductor means positioned to be passed by and influenced by said magnetic means; scaling resistor means connected in series with said magnetically dependent semiconductor means for forming with said semiconductor means a voltage divider connected in parallel with said ignition capacitor means, said magnetic means being driven relative to said magnetically dependent semiconductor means; and means for connecting the voltage junction between said scaling resistor means and said magnetically dependent semiconductor means to said auxiliary electronic switch means so as to render the latter conductive when said magnetic means passes thereby, said magnetically dependent semiconductor means being influenced by magnetic means prior to said control coil means after charging of said ignition capacitor means when the engine rotates opposite to said predetermined direction.
  • the ignition arrangement for an internal combustion engine as defined in claim 8 including a magnetic core magnetically coupled with said magnetic-field-dependent semiconductor means, said core having poles directed toward said magnetic means.
  • said magnetic means moves relative to said auxiliary coil means so that said auxiliary coil means applies a voltage to said controlled electronic switch means prior to said control coil means when said internal combustion engine rotates opposite to said predetermined direction and the fuel-air mixture within the engine is substantially uncompressed.
  • control voltage is applied to said controlled electronic switch means at the instant that the air-fuel mixture within the engine is compressed and the engine rotates in said predetermined direction, said control voltage being applied to said controlled electronic switch means before said mixture is compressed when the engine rotates opposite to said predetermined direction.
  • the ignition arrangement for an internal combustion engine as defined in claim 15 including further core means for carrying said charging coil, said magnetizable members moving only past the poles of said core carrying said control winding and the poles of said magnetic means moving only past the poles of said further core carrying said charging coil means.

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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)
US838423A 1968-07-04 1969-07-02 Ignition arrangement for internal combustion engines Expired - Lifetime US3612023A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681764609 DE1764609C3 (de) 1968-07-04 Zündeinrichtung für Brennkraftmaschinen

Publications (1)

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US3612023A true US3612023A (en) 1971-10-12

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US838423A Expired - Lifetime US3612023A (en) 1968-07-04 1969-07-02 Ignition arrangement for internal combustion engines

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US (1) US3612023A (xx)
AT (1) AT303457B (xx)
ES (1) ES369077A1 (xx)
FR (1) FR2014502A1 (xx)
GB (1) GB1269710A (xx)
SE (1) SE347549B (xx)
YU (1) YU32055B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863616A (en) * 1971-09-13 1975-02-04 Outboard Marine Corp Capacitor discharge system with speed control sub-circuit
US4014309A (en) * 1973-10-17 1977-03-29 Nippondenso Co., Ltd. Capacitor discharge type contactless ignition system for internal combustion engines
US4038951A (en) * 1972-11-09 1977-08-02 Gehap Gesellschaft Fur Handel Und Patentverwertung Mbh & Co. Kg Device for limiting the speed of internal-combustion engine
US4103664A (en) * 1976-09-21 1978-08-01 Kubota, Ltd. Combustion chamber for compact engine of the side valve type for universal use having contactless ignition system
US4173963A (en) * 1976-07-06 1979-11-13 Siemens Aktiengesellschaft Electronic magneto ignition for internal combustion engines
US4201171A (en) * 1977-05-04 1980-05-06 Kokusan Denki Co., Ltd. Ignition system for a multicylinder engine
US5158056A (en) * 1991-11-04 1992-10-27 Torque Converters, Inc. Integral magnetic ignition pickup trigger
WO1995015438A1 (en) * 1993-12-01 1995-06-08 Fhp Elmotor Aktiebolag Ignition system for an internal-combustion engine, particularly for use in a chain saw or the like
US6076503A (en) * 1996-12-13 2000-06-20 Tecumseh Products Company Electronically controlled carburetor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1999703A (en) * 1931-11-21 1935-04-30 Lesage Alfred Flywheel magneto apparatus
US3356896A (en) * 1964-12-16 1967-12-05 Motorola Inc Electronic device
US3362389A (en) * 1965-12-01 1968-01-09 Outboard Marine Corp Ignition system
US3435264A (en) * 1965-08-13 1969-03-25 Bosch Gmbh Robert Magneto flywheel ignition
US3465739A (en) * 1967-10-16 1969-09-09 Phelon Co Inc Inductively triggered breakerless ignition system with automatic spark advance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1999703A (en) * 1931-11-21 1935-04-30 Lesage Alfred Flywheel magneto apparatus
US3356896A (en) * 1964-12-16 1967-12-05 Motorola Inc Electronic device
US3435264A (en) * 1965-08-13 1969-03-25 Bosch Gmbh Robert Magneto flywheel ignition
US3362389A (en) * 1965-12-01 1968-01-09 Outboard Marine Corp Ignition system
US3465739A (en) * 1967-10-16 1969-09-09 Phelon Co Inc Inductively triggered breakerless ignition system with automatic spark advance

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863616A (en) * 1971-09-13 1975-02-04 Outboard Marine Corp Capacitor discharge system with speed control sub-circuit
US4038951A (en) * 1972-11-09 1977-08-02 Gehap Gesellschaft Fur Handel Und Patentverwertung Mbh & Co. Kg Device for limiting the speed of internal-combustion engine
US4014309A (en) * 1973-10-17 1977-03-29 Nippondenso Co., Ltd. Capacitor discharge type contactless ignition system for internal combustion engines
US4173963A (en) * 1976-07-06 1979-11-13 Siemens Aktiengesellschaft Electronic magneto ignition for internal combustion engines
US4103664A (en) * 1976-09-21 1978-08-01 Kubota, Ltd. Combustion chamber for compact engine of the side valve type for universal use having contactless ignition system
US4201171A (en) * 1977-05-04 1980-05-06 Kokusan Denki Co., Ltd. Ignition system for a multicylinder engine
US5158056A (en) * 1991-11-04 1992-10-27 Torque Converters, Inc. Integral magnetic ignition pickup trigger
WO1995015438A1 (en) * 1993-12-01 1995-06-08 Fhp Elmotor Aktiebolag Ignition system for an internal-combustion engine, particularly for use in a chain saw or the like
US6076503A (en) * 1996-12-13 2000-06-20 Tecumseh Products Company Electronically controlled carburetor
US6273065B1 (en) 1996-12-13 2001-08-14 Tecumseh Products Company Electronically controlled carburetor

Also Published As

Publication number Publication date
YU165769A (en) 1973-08-31
DE1764609A1 (de) 1971-09-09
FR2014502A1 (xx) 1970-04-17
AT303457B (de) 1972-11-27
GB1269710A (en) 1972-04-06
YU32055B (en) 1974-02-28
ES369077A1 (es) 1971-06-16
DE1764609B2 (de) 1975-09-11
SE347549B (xx) 1972-08-07

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