EP0154567A1 - Schutzeinrichtung für ein Zündsystem eines Kraftfahrzeuges - Google Patents

Schutzeinrichtung für ein Zündsystem eines Kraftfahrzeuges Download PDF

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Publication number
EP0154567A1
EP0154567A1 EP85400021A EP85400021A EP0154567A1 EP 0154567 A1 EP0154567 A1 EP 0154567A1 EP 85400021 A EP85400021 A EP 85400021A EP 85400021 A EP85400021 A EP 85400021A EP 0154567 A1 EP0154567 A1 EP 0154567A1
Authority
EP
European Patent Office
Prior art keywords
coil
positive terminal
battery
contact
transistor
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.)
Granted
Application number
EP85400021A
Other languages
English (en)
French (fr)
Other versions
EP0154567B1 (de
Inventor
Serge Daniel
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.)
Ducellier et Cie
Original Assignee
Ducellier et Cie
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 Ducellier et Cie filed Critical Ducellier et Cie
Publication of EP0154567A1 publication Critical patent/EP0154567A1/de
Application granted granted Critical
Publication of EP0154567B1 publication Critical patent/EP0154567B1/de
Expired 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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
    • F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices

Definitions

  • the present invention relates to a protection device for a motor vehicle ignition system of the type comprising in series with the vehicle ignition key an ignition coil and its control circuit.
  • the ignition systems most used to date include a so-called dynamic distributor constituted by a single stud, connected to the coil, which rubs on a single rotary finger which distributes the high voltage to the spark plugs of the engine. .
  • the aim of the present invention is to remedy these drawbacks and to this end relates to a protection device for a motor vehicle ignition system which comprises powered by the vehicle battery, through a contact made by the vehicle ignition key, at least one coil, the primary of which is controlled by a control circuit in order to supply the energy necessary for at least one spark plug, device characterized in that it comprises, in parallel with the terminals of the contact, a switch capable of directly connecting the terminal positive from the coil to the positive terminal of the battery as soon as a fault occurs in the coil supply.
  • an ignition coil 1 is controlled by a circuit 2, the ignition device being energized by a contact 4, produced by the ignition key, disposed between the positive terminal of the battery 3 and the ignition coil 1, in order to provide the necessary energy the operation of at least one spark plug 5.
  • a circuit for protection against parasitic ignitions connects the coil 1 to the positive terminal of the battery and consists of two transistors 6 and 7, two diodes 11 and 12, two capacitive elements 10 and 13 and two resistors 8 and 9.
  • the collector-emitter junction of transistor 6, of the NPN type is connected in parallel to the terminals of the ignition key 4 and provides the direct connection between the coil 1 and the battery 3.
  • the emitter of transistor 7, of PNP type is connected to the positive terminal of the battery, its collector at the base of the transistor 6, and its base between the two resistors 8 and 9 which are in series with the capacitive element 10, this assembly constitutes elements 8 to 10 being connected in parallel to contact 4, the diode 11 is connected in parallel to the resistors 8 and 9 passing from the capacitive element 10 to the battery 3, the diode 12 is connected passing from the positive terminal of the coil 1 to the battery 3 and the capacitive element 13 connects the positive terminal of the coil 1 to ground.
  • the voltage Uc across the terminals of the capacitive element 10 becomes zero, the transistor 7 becomes saturated, as well as the transistor 6, the voltage Us is 14V minus the junction voltage of the transistor 6.
  • the coil 1 is then supplied directly by the battery without passing through the contact 4. If the opening is very brief, of the order of one second for example, the voltage Us remains practically constant during the overvoltage.
  • the capacitive element 10 charges through the resistors 8 and 9, the base-emitter voltage of the tansistor 7 decreases, as does that of the transistor 6, which gradually blocks, the voltage Us decreases until to zero after about 3.5s.
  • the diode 12 protects the transistor 6 against reverse overvoltages and the capacitive element 13 blocks the parasitic voltages which would prevent the charging of the element 10 when the contact 4 is open.

Landscapes

  • 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)
EP19850400021 1984-03-01 1985-01-08 Schutzeinrichtung für ein Zündsystem eines Kraftfahrzeuges Expired EP0154567B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8403199 1984-03-01
FR8403199A FR2560646B1 (fr) 1984-03-01 1984-03-01 Dispositif de protection pour systeme d'allumage de vehicule automobile

Publications (2)

Publication Number Publication Date
EP0154567A1 true EP0154567A1 (de) 1985-09-11
EP0154567B1 EP0154567B1 (de) 1988-07-06

Family

ID=9301578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850400021 Expired EP0154567B1 (de) 1984-03-01 1985-01-08 Schutzeinrichtung für ein Zündsystem eines Kraftfahrzeuges

Country Status (3)

Country Link
EP (1) EP0154567B1 (de)
DE (1) DE3563645D1 (de)
FR (1) FR2560646B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745985A (en) * 1970-09-28 1973-07-17 Bosch Gmbh Robert Arrangement for preventing current flow in the ignition coil of an internal combustion engine during standstill conditions
US3854466A (en) * 1971-07-24 1974-12-17 Bosch Gmbh Robert Ignition system for an internal combustion engine
FR2240648A5 (de) * 1973-08-07 1975-03-07 Bosch Gmbh Robert

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745985A (en) * 1970-09-28 1973-07-17 Bosch Gmbh Robert Arrangement for preventing current flow in the ignition coil of an internal combustion engine during standstill conditions
US3854466A (en) * 1971-07-24 1974-12-17 Bosch Gmbh Robert Ignition system for an internal combustion engine
FR2240648A5 (de) * 1973-08-07 1975-03-07 Bosch Gmbh Robert

Also Published As

Publication number Publication date
DE3563645D1 (en) 1988-08-11
FR2560646B1 (fr) 1986-08-29
FR2560646A1 (fr) 1985-09-06
EP0154567B1 (de) 1988-07-06

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