EP0131905A2 - Système d'allumage à magnéto sans contact - Google Patents

Système d'allumage à magnéto sans contact Download PDF

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Publication number
EP0131905A2
EP0131905A2 EP84108142A EP84108142A EP0131905A2 EP 0131905 A2 EP0131905 A2 EP 0131905A2 EP 84108142 A EP84108142 A EP 84108142A EP 84108142 A EP84108142 A EP 84108142A EP 0131905 A2 EP0131905 A2 EP 0131905A2
Authority
EP
European Patent Office
Prior art keywords
core
winding
primary winding
ignition system
carrying
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.)
Withdrawn
Application number
EP84108142A
Other languages
German (de)
English (en)
Other versions
EP0131905A3 (fr
Inventor
Paolo Marino
Vincenzo Piombini
Paolo Sevini
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.)
Ducati Elettrotecnica SpA
Original Assignee
Ducati Energia SpA
Zanussi Elettromeccanica SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ducati Energia SpA, Zanussi Elettromeccanica SpA filed Critical Ducati Energia SpA
Publication of EP0131905A2 publication Critical patent/EP0131905A2/fr
Publication of EP0131905A3 publication Critical patent/EP0131905A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F02P1/02—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage the generator rotor being characterised by forming part of the engine flywheel
    • 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

Definitions

  • the present invention relates to a contactless magnetic- induction ignition system for internal combustion engines.
  • Magnet ignition systems are generally based on the principle of the generation of a voltage in a conductor subjected to a variable magnetic flux. More particularly, a sudden decrease of the magnetic flux in a core carrying an electric conductor is effective to induce a high voltage which may be applied to a spark plug, resulting in the generation of a spark, and thus in ignition of the combustion mixture.
  • Known contactless magnet ignition systems for internal combustion engines normally employ electronic circuits for interrupting the current flow in the primary winding so as to induce in the secondary winding a high voltage effective to generate a spark at the proper instant during the operating cycle of the engine.
  • This auxiliary coil is normally mounted together with the ignition coil proper on a single magnetic core, so that the voltage generated in the auxiliary winding is induced by a part of the magnetic flux which is thus unable to contribute to the current flow in the short-circuited primary winding.
  • this object is attained in a contactless magnet ignition system comprising a first core of U-shaped cross-sectional configuration carrying a primary winding on its central portion defined between the legs of said U-shape.
  • a second core carries a control winding, while a rotor carrying at least one permanent magnet is adapted to generate a variable flux in said cores for inducing respective voltages at the terminals of the windings.
  • Control means are controleld by the voltage induced in said control winding for interrupting the current flow in a closing circuit of said primary winding.
  • This ignition system is essentially characterized in that said second core is disposed outside of said primary winding with its axis substantially perpendicular to the main axis of said first core and spaced therefrom within the space enclosed between said legs.
  • the ignition system comprises a rotatory component having two magnetic poles and formed of a rotor 3 proper made of a ferromagnetic material (constituting one polarity) and carrying a permanent magnet 4 provided with a pole shoe member 5 mace of a ferromagnetic material (constituting the other polarity).
  • the rotatory component shown in fig. 1 is adapted to rotate in the clockwise direction and is driven by the shaft of an internal combustion engine.
  • the stationary component of the ignition system comprises a first magnetic core 6 of U-shaped cross-sectional configuration includign a central portion 7 defined between two legs 8 extending towards rotor 3..
  • the ignition coil of the system comprising a primary winding 10 and a secondary winding 11 connected to the electrodes of a spark plug 12 (fig. 2).
  • the ignition system comprises an electronic circuit 13 for short-circuiting primary winding 10, circuit 13 being of a per se known type and essentially including two Darlington-connected transistors 14, 15, resistors 16, 17 a polarization diode 18.
  • the collector of transistor 19 is connected to the base of transistor 14, while its base is connected via a resistor 21 and a rectifier diode 22 to a terminal of a control winding 23.
  • the other terminal of control wincing 23 is grounded, and the base of transistor 19 is also connected to ground through a capacitor 24.
  • capacitor 24 and resistor 21 together form a time constant circuit having a double function as will be explained.
  • control winding 23 is disposed on a second core 9 separate from first core 6 and disposed outside of primary winding 10.
  • second core 9 is disposed with its axis substantially perpendicular to the main axis of first core 6 and at a substantial distance therefrom within the space defined between legs 8.
  • Second core 9 and the associated control winding 23 are preferably mounted on a base plate (not shown) carrying the main electronic components of the circuit shown in fig. 2.
  • second core 9 and control winding 23 are disposed at a slightly offset location with respect to first core 6 and ignition coil 10, 11 (taking into account the direction of rotation of rotor 3).
  • a voltage pulse is generated in ccntrol winding 23 when the current flowing through primary winding 10 is substantially at its maximum value.
  • the operation of the circuit shown in fig. 2 is per se known.
  • the electronic circuit 13 is normally made conductive by the voltage generated in primary winding 10, so that the latter is practically short-circuited.
  • rotor 3. 4, 5 acts to induce in control winding 23 a voltage pulse which is applied through diode 22 and time constant circuit 21, 24 to transistor 19 to render the latter conductive.
  • RC circuit 21, 24 By suitably dimensioning RC circuit 21, 24 it is possible to adjust (in combination with the physical location of control winding 23) the blocking instant of electronic circuit 13 and thus the instant at which the spark is dis- charegd across spark plug 12.
  • RC circuit 21, 24 controls the switching speed of transistor 19 so as to limit the value of the overvoltage at the terminals of the electronoc circuit 13 as the latter is blocked. In this manner it is avoided that the overvoltage at the terminals cf electronic circuit 13 exceeds the breakdown voltage, whereby the reliability of the entire ignition system is improved.
  • the particular positioning of cores 6 and 9 and the respective windigns 10, 11 and 23 relative to one another minimizes the possibility of interference signals being induced in control winding 23 (particularly on short-circuiting primary winding 10).
  • the ignition system functions in a highly accurate manner so as to attain the above stated object of the invention.
EP84108142A 1983-07-15 1984-07-11 Système d'allumage à magnéto sans contact Withdrawn EP0131905A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45719/83A IT1195596B (it) 1983-07-15 1983-07-15 Sistema di accensione a magnete senza contatti
IT4571983 1983-07-15

Publications (2)

Publication Number Publication Date
EP0131905A2 true EP0131905A2 (fr) 1985-01-23
EP0131905A3 EP0131905A3 (fr) 1986-02-26

Family

ID=11257654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108142A Withdrawn EP0131905A3 (fr) 1983-07-15 1984-07-11 Système d'allumage à magnéto sans contact

Country Status (3)

Country Link
EP (1) EP0131905A3 (fr)
ES (1) ES533388A0 (fr)
IT (1) IT1195596B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001446A1 (fr) * 1989-07-25 1991-02-07 Idm S.R.L. Systeme d'allumage a decharge inductive pour moteurs a combustion interne
FR2713719A1 (fr) * 1993-12-09 1995-06-16 Stihl Andreas Installation d'allumage magnétique pour une machine à moteur à combustion interne, notamment pour scie à chaîne motorisée.
EP0741445A2 (fr) * 1995-05-02 1996-11-06 Oppama Industry Co., Ltd. Un rotor de génératrice magnéto-électrique et un outil pour démonter ce rotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090488A (en) * 1972-12-30 1978-05-23 Iida Denki Kogyo K.K. Ignition circuit for the internal combustion engine and premature ignition prevention method in the ignition device
GB1602329A (en) * 1977-04-25 1981-11-11 Mcculloch Corp Breakerless magneto device
US4336785A (en) * 1980-04-28 1982-06-29 Eltra Corporation Magneto ignition with field-responsive biasing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090488A (en) * 1972-12-30 1978-05-23 Iida Denki Kogyo K.K. Ignition circuit for the internal combustion engine and premature ignition prevention method in the ignition device
GB1602329A (en) * 1977-04-25 1981-11-11 Mcculloch Corp Breakerless magneto device
US4336785A (en) * 1980-04-28 1982-06-29 Eltra Corporation Magneto ignition with field-responsive biasing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001446A1 (fr) * 1989-07-25 1991-02-07 Idm S.R.L. Systeme d'allumage a decharge inductive pour moteurs a combustion interne
US5265573A (en) * 1989-07-25 1993-11-30 I D M S.R.L. Inductive discharge ignition system for internal combustion engines
FR2713719A1 (fr) * 1993-12-09 1995-06-16 Stihl Andreas Installation d'allumage magnétique pour une machine à moteur à combustion interne, notamment pour scie à chaîne motorisée.
EP0741445A2 (fr) * 1995-05-02 1996-11-06 Oppama Industry Co., Ltd. Un rotor de génératrice magnéto-électrique et un outil pour démonter ce rotor
EP0741445A3 (fr) * 1995-05-02 1998-07-29 Oppama Industry Co., Ltd. Un rotor de génératrice magnéto-électrique et un outil pour démonter ce rotor

Also Published As

Publication number Publication date
ES8504341A1 (es) 1985-04-01
EP0131905A3 (fr) 1986-02-26
ES533388A0 (es) 1985-04-01
IT8345719A1 (it) 1985-01-15
IT1195596B (it) 1988-10-19
IT8345719A0 (it) 1983-07-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Owner name: DUCATI ELETTROTECNICA SPA

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Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

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Owner name: DUCATI ENERGIA S.P.A.

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Effective date: 19861027

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SEVINI, PAOLO

Inventor name: PIOMBINI, VINCENZO

Inventor name: MARINO, PAOLO