US3736914A - Electronic ignition system for an internal combustion engine - Google Patents

Electronic ignition system for an internal combustion engine Download PDF

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Publication number
US3736914A
US3736914A US00160413A US3736914DA US3736914A US 3736914 A US3736914 A US 3736914A US 00160413 A US00160413 A US 00160413A US 3736914D A US3736914D A US 3736914DA US 3736914 A US3736914 A US 3736914A
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US
United States
Prior art keywords
magnets
magnet
permanent magnets
pole
end faces
Prior art date
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
US00160413A
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English (en)
Inventor
P Schmaldienst
G Brand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Priority claimed from DE19702033484 external-priority patent/DE2033484C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3736914A publication Critical patent/US3736914A/en
Anticipated expiration legal-status Critical
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
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/05—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means
    • F02P5/06—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means dependent on engine speed
    • 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
    • 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 A plurality of magnets rotated by the engine induces an alternating current voltage in a winding for charging the ignition capacitor, the discharge of the capacitor being controlled by a thyristor of which the control electrode is connected to a winding in which is induced, one each complete rotation of the magnets, a control voltage.
  • Two neighboring magnets have extension pieces that cooperate with the core of the control winding to induce therein the control voltage, the remaining magnets being so positioned with respect to the core that during rotation these magnets induce no control voltage.
  • the invention relates to an electronic ignition system for an internal combustion engine, the sparking of the one or more spark plugs being controlled by a control voltage that is induced in a control winding carried by a magnetic core and conducted to the control electrode of an electronic switch, such as a thyristor.
  • a rotatable magnetic system which comprises a plurality of magnets that, with respect to the axis of rotation, are radially polarized and are mounted on a hollow, cylindrical, short circuiting part. These magnets are spaced apart in the direction of the circumference of the cylindrical short circuiting part. The polarity of these magnets alternates, there being an alternating current winding carried by an iron core, in which winding an alternating current is induced when the magnets rotate.
  • Two lines each drawn from the axis of rotation through the center of a respective end face of the core, lie along different radii of the cylindrical short circuiting part, which latter is part of a cup-shaped body of rotation, which has an inwardly extending connecting hub.
  • alternating current winding can be used, for example, to charge the ignition capacitor, which, by triggering the aforesaid electronic switch, can be discharged through the primary winding of a spark coil, the sparkplug being connected across the secondary winding of this coil.
  • a second alternating current winding carried by another iron core. The same magnetic system induces an alternating current in the secnd winding.
  • the magnetic system In order to obtain an alternating current voltage of sufficiently high frequency, the magnetic system must have as many magnets as possible. If these same magnets would be used to induce the control voltage in the aforesaid control winding, the control voltage would cause too many ignitions and at times that would damage the engine, since in most cases only a single ignition is required for each complete rotation of the magnetic system.
  • An object of the invention is an electronic ignition system for an internal combustion engine that avoids a special magnet for obtaining the ignition control voltage.
  • the invention consists of a magnetic system, the magnetic system including a plurality of permanent magnets spaced about a common axis and defining a cylinder, means for mounting the plurality of magnets free to be driven in rotation by the engine about this common axis, an electronic switch for permitting when conductive the production of an ignition causing spark, a stationary magnetic core located within the cylinder and having two spaced end faces located opposite said plurality of permanent magnets, the respective centers of said end faces lying in a common radial plane of the cylinder, a control winding carried by the magnetic core and connected to the switch for generating a control voltage to control the conductivity of the switch when the plurality of permanent magnets rotates, and wherein each magnet of this plurality of permanent magnets is polarized along a radius of the cylinder, successive magnets of the plurality of permanent magnets having alternating polarity, this plurality of permanent magnets including first and second neighboring magnets, the plurality of magnets excepting these first and second magnets being so positioned with respect to the
  • FIG. 1 is an isometric view, partly cutaway, of the ignition system incorporating the improvement of the invention, the isometric view including a wiring diagram of the electric circuit;
  • FIG. 2 is an isometric view of one embodiment of the core for the control winding.
  • FIG. 3 is an isometric view of a second embodiment of the core for the control winding.
  • the ignition system illustrated which is intended for an internal combustion engine, now shown, comprises an ignition capacitor 11 of which one plate is connected to the ground rail 12 and the other plate is connected to the cathode of a rectifier 13.
  • the anode of the rectifier 13 is connected to the terminal 14 of an alternating current winding 15, which serves as the charging winding, the other terminal 16 of this winding being connected to the ground rail 12.
  • the ungrounded plate of the ignition capacitor 11 is also connected by the primary winding 17 of a spark coil 18 to the output electrode 19 of a thyristor that operates as an electronic switch 20, the reference electrode 21 and the control electrode 22 of the thyristor respectively being connected to the ground rail 12 and to to the cathode of a control diode 23.
  • the anode of the control diode 23 is connected to the control terminal 24 of a control winding 25, the reference terminal 26 of which is connected to the grounded rail 12.
  • the spark coil 18 also includes a secondary winding 27 across which is connected the spark plug 28, one end of the secondary being connected to the grounded rail 12.
  • the alternating current winding is mounted on an iron core 29, and is located along a chord of a circular path along which move the magnets M of a magnetic system M, the magnets being moved in the direction of the arrow P by the internal combustion engine.
  • Each of the magnets M (three being shown, although there are four in this particular embodiment) is in the form of a shell, the outer faces of which are fixed to the inner wall 30 of a hollow, cylindrical, magnetic short circuiting part 32.
  • This part is a component of a cup-shaped body of revolution 31, which is made of a magnetiferous material and incorporates a central, downwardly projecting, hub 34.
  • the hub 34 incorporates a central bore 33, which accepts a shaft W that is rotated by the internal combustion engine.
  • the magnet M are radially polarized, as shown in FIG. 1, the north and sourth poles being designated by the respective reference letters N and S.
  • the magnets M are spaced from one another a distance Z in the direction of rotation, the active poles (those poles nearest to the ends 35 and 36 of the core 29) of successive magnets being of alternating polarity as they are moved by the end faces 35 and 36.
  • the angle or defined between the radii r1 and r2, which begin at the axis of rotation O and pass through the centers a1 and a2 of these end faces, is so chosen that when a N pole passes by the end face 35 an S pole passes by the end face 36, or the reverse is true, or else when a spacing Z passes by the face 35 another spacing Z passes by the face 36.
  • the alternating current winding 15 and the iron core 29 therefor are mounted on a circular plate 37, which is rigidly fixed to the internal combustion engine, and which incorporates a central opening 38 for the hub 34 and the shaft W.
  • an iron core 39 which carries the control winding 25.
  • the iron core 39 is so positioned with respect to the magnets M that the centers of the two end faces 40 and 41 of the core 39 lie in the same radial plane with respect to the axis 0.
  • the control voltage for the switch 20 is induced in the winding 25 by two neighboring magnets M1 and M2 of the magnets M.
  • the magnets M1 and M2 have each a respective tongue-like extension 42 and 43 of a respective active N and S pole, these extensions projecting into the common space Z between these two magnets.
  • the extensions 42 and 43 are spaced apart a distance b in the axial direction, just as are the faces 40 and 41; and in a predetermined rotational position (shown in FIG. 1) of the magnetic system M they are aligned with, or cover, respective ones of the end faces 40 and 41, so that three edges of a face 40 or 41 are aligned with three edges of a respective extension 43 or 42.
  • each of the active poles of the magnets M is covered with a magnetiferous plate L, the respective plates L1 and L2 for the magnets M1 and M2" having each a respective tongue F1 and F2, which extends at least approximately concentrically with the part 32.
  • These tongues constitute, in a very simple manner, the extensions 42 and 43.
  • At least one of the end faces 40 and 41 has an extension surface 44 (see FIGS. 2 and 3), which, in respect of the direction of rotation P of the magnetic system M, precedes the end face 40 or 41.
  • the extension surface 44 is incorporated by a magnetiferous extension piece 45, which is connected to the iron core 39, the cross section through which the magnetic flux is conducted being smaller than the cross section of the iron core 39.
  • extension surface 44 contiguous with the end face, as shown in FIG. 2.
  • the extension surface 44 is incorporated on that part of the extension piece 45 that tapers, in the manner of a crescent, in the direction opposite to that in which the magnetic system M rotates. In this case it is sufficient when the end face provided with the extension surface 44 is that end face (here 41) that is aligned with the extension 42.
  • each of the end faces 40 and 41 is provided with an extension surface 44.
  • ignition capacitor 11 can be charged through a full wave bridge rectifier, so that each half wave of the voltage induced in the alternating current winding 15 is used to charge the ignition capacitor 11.
  • the ignition system is intended for a single cylinder internal combustion engine, so that, if the magnetic system rotates at the same speed as does the engine, there will be one ignition for each complete rotation of the magnetic system. This is ensured, because during one complete rotation of the magnetic system the extensions 42 and 43 are rotated past the end faces 40 and 41 only once, so that there is obtained only one complete cycle of alternating current voltage, that half wave thereof that is conducted by the diode 23 to the control electrode 22 of the switch 20 triggering the latter.
  • the ignition capacitor 11 can now discharge through the primary winding 17 of the spark coil 18, so as to induce in the secondary winding 27 a high voltage spike that produces a spark in the gap of the spark plug 28, which spark ignites the compressed fuel-air mixture in the cylinder of the engine.
  • the extension piece 45 causes a control voltage in the form of a full wave alternating current voltage when the extensions 42 and 43 pass by the extension surfaces 44.
  • the peak amplitude of this full wave is too small to reach the threshold voltage of the thyristor 20, so that there is ignition only when the extensions 42 and 43 pass by the end faces 40 and 41.
  • the engine speed exceeds a predetermined rpm, there is a sudden, stepped, advance of the ignition, because the control voltage caused by the extension surfaces 44 now has a sufficient amplitude to trigger the switch 20.
  • the electric power for the lights and the horn can be obtained from the alternating current winding or from an additional alternating current winding carried by a separate core, in which the magnetic system induces, as it does in the winding 15, an alternating current.
  • the number of magnets M can be more than four and/or more than one space Z can be provided with the pole extensions 42 and 43.
  • An arrangement in an electronic ignition system having an ignition capacitor, for an internal combustion engine having at least one spark plug, comprising, in combination, a magnet system, said magnetic system including a plurality of permanent magnets spaced about a common axis and defining a cylinder; means for mounting said plurality of magnets free to be driven in rotation by the engine about said common axis; an electronic switch for permitting when conductive the production of an ignition causing spark; a stationary magnetic core located within said cylinder and having two spaced end faces located opposite the inner periphcry of said cylinder, the respective centers of said end faces lying in a common radial plane of said cylinder; a control winding carried by said magnetic core and connected to said switch for generating a control voltage to control the conductivity of said switch when said plurality of permanent magnets rotates, and wherein each magnet of said plurality of permanent magnets is polarized along a radius of said cylinder, successive magnets of said plurality of permanent magnets having alternating polarity, said plurality of permanent magnets including first and
  • extension piece means includes a respective extension for each of said two end faces of said magnetic COI'C.

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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)
US00160413A 1970-07-07 1971-07-17 Electronic ignition system for an internal combustion engine Expired - Lifetime US3736914A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702033484 DE2033484C3 (de) 1970-07-07 Zündvorrichtung für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3736914A true US3736914A (en) 1973-06-05

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ID=5775952

Family Applications (1)

Application Number Title Priority Date Filing Date
US00160413A Expired - Lifetime US3736914A (en) 1970-07-07 1971-07-17 Electronic ignition system for an internal combustion engine

Country Status (9)

Country Link
US (1) US3736914A (fr)
JP (1) JPS5228968B1 (fr)
AT (1) AT309908B (fr)
CA (1) CA928376A (fr)
CH (1) CH539201A (fr)
ES (1) ES392965A1 (fr)
FR (1) FR2117000A5 (fr)
GB (1) GB1335137A (fr)
SE (1) SE362286B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861373A (en) * 1973-03-23 1975-01-21 Bosch Gmbh Robert Magneto ignition system for internal combustion engines
US4079712A (en) * 1975-01-31 1978-03-21 Nippondenso Co., Ltd. Contactless capacitor discharge type ignition system for internal combustion engine
US4170206A (en) * 1976-08-27 1979-10-09 Kokusan Denki Co., Ltd. Ignition system for an internal combustion engine
US6571769B2 (en) * 2001-08-07 2003-06-03 Kokusan Denki Co., Ltd. Capacitor discharge type internal combustion engine ignition device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500809A (en) * 1967-05-09 1970-03-17 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3554179A (en) * 1969-06-19 1971-01-12 Phelon Co Inc Antireverse trigger for an ignition system
US3598098A (en) * 1968-05-02 1971-08-10 Bosch Gmbh Robert Ignition arrangment for internal combustion engines
US3599615A (en) * 1969-05-29 1971-08-17 Motorola Inc Spark advance mechanism for solid state ignition systems
US3623467A (en) * 1969-11-24 1971-11-30 Phelon Co Inc Triggering magnet and coil assembly for use with an ignition system including a permanent magnet alternator
US3630185A (en) * 1969-02-13 1971-12-28 Bosch Gmbh Robert Ignition-timing apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1482407A (fr) * 1966-06-06 1967-05-26 Globe Union Inc Perfectionnement aux magnétos d'allumage
US3464397A (en) * 1967-01-23 1969-09-02 Ambac Ind Ignition system for internal combustion engines and the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500809A (en) * 1967-05-09 1970-03-17 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3598098A (en) * 1968-05-02 1971-08-10 Bosch Gmbh Robert Ignition arrangment for internal combustion engines
US3630185A (en) * 1969-02-13 1971-12-28 Bosch Gmbh Robert Ignition-timing apparatus
US3599615A (en) * 1969-05-29 1971-08-17 Motorola Inc Spark advance mechanism for solid state ignition systems
US3554179A (en) * 1969-06-19 1971-01-12 Phelon Co Inc Antireverse trigger for an ignition system
US3623467A (en) * 1969-11-24 1971-11-30 Phelon Co Inc Triggering magnet and coil assembly for use with an ignition system including a permanent magnet alternator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861373A (en) * 1973-03-23 1975-01-21 Bosch Gmbh Robert Magneto ignition system for internal combustion engines
US4079712A (en) * 1975-01-31 1978-03-21 Nippondenso Co., Ltd. Contactless capacitor discharge type ignition system for internal combustion engine
US4170206A (en) * 1976-08-27 1979-10-09 Kokusan Denki Co., Ltd. Ignition system for an internal combustion engine
US6571769B2 (en) * 2001-08-07 2003-06-03 Kokusan Denki Co., Ltd. Capacitor discharge type internal combustion engine ignition device

Also Published As

Publication number Publication date
FR2117000A5 (fr) 1972-07-21
CH539201A (de) 1973-07-15
GB1335137A (en) 1973-10-24
DE2033484B2 (de) 1976-01-08
JPS5228968B1 (fr) 1977-07-29
AT309908B (de) 1973-09-10
SE362286B (fr) 1973-12-03
CA928376A (en) 1973-06-12
ES392965A1 (es) 1973-09-16
DE2033484A1 (de) 1972-01-20

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