EP0046092B1 - Dispositif électronique de commande d'allumage de moteur à combustion interne - Google Patents

Dispositif électronique de commande d'allumage de moteur à combustion interne Download PDF

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Publication number
EP0046092B1
EP0046092B1 EP19810400964 EP81400964A EP0046092B1 EP 0046092 B1 EP0046092 B1 EP 0046092B1 EP 19810400964 EP19810400964 EP 19810400964 EP 81400964 A EP81400964 A EP 81400964A EP 0046092 B1 EP0046092 B1 EP 0046092B1
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EP
European Patent Office
Prior art keywords
resistor
circuit
capacitor
input
ignition
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
Application number
EP19810400964
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German (de)
English (en)
French (fr)
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EP0046092A1 (fr
Inventor
Jean Marie Pierret
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
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Ducellier et Cie
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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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • 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
    • F02P3/045—Layout of circuits for control of the dwell or anti dwell time
    • F02P3/0453—Opening or closing the primary coil circuit with semiconductor devices

Definitions

  • the invention relates to an electronic device for controlling the ignition of an internal combustion engine, in particular for motor vehicles, device comprising an element for comparing a voltage value, an ignition coil comprising a primary winding connected in series with a electronic switch, a secondary winding connected consecutively to the spark plugs selected by an ignition distributor, resistive and capacitive external elements capable of ensuring the operation of a monolithic circuit enabling a constant energy spark to be obtained at spark plug electrodes.
  • Such a monolithic circuit known from FR-A-2416357 is associated with a magnetic generator of alternating ignition trigger signals.
  • This magnetic generator consists of a rotor driven in rotation by the distributor shaft in which is housed this magnetic generator, which rotor has at its periphery polar teeth folded parallel to the longitudinal direction in the distributor shaft.
  • the stator of said generator comprises a permanent magnet of annular shape and an induced winding arranged concentrically with the shaft.
  • Polar teeth also folded parallel to the shaft are disposed at the periphery of said stator, polar teeth inside which rotate the polar teeth of the rotor so as to generate alternating signals whose amplitude is known to increase with the speed d generator drive.
  • this delivers signals whose amplitude of ⁇ 140 millivolts is attenuated up to an amplitude of ⁇ 70 millivolts, via the voltage divider bridge constituted by the external resistors R8 and R9, to the common point of which is connected the input 6 of the circuit monolithic 5.
  • This voltage divider bridge therefore constitutes an invariable rate attenuator circuit as a function of variations in the rotation speed of the internal combustion engine.
  • the triggering value of the shaping means has been fixed at ⁇ 70 millivolts.
  • the obligation of a very low speed for triggering the ignition sparks means that with the magnetic generator available and at the engine idling speed, i.e. approximately 300 revolutions per minute at the level of the magnetic generator, the duration of passage of the current in the primary winding of the ignition coil reaches 45% of the period T of the signal delivered by the magnetic generator.
  • This duration could be reduced to 30% by modifying the values of the resistors R8, R9, i.e. 15 KSZ for r8 and 5.6 KSt for r R9 instead of 10 KU, but this modification would then cause the production of ignition sparks, during the start-up phase, at a speed approximately twice as high as the value mentioned above, which would not be acceptable.
  • the object of the present invention is to combine the advantages of the two solutions, by eliminating the drawbacks of each of them, that is to say maintaining a triggering of the ignition sparks at a very low engine starting speed and d '' at its idle speed, a duration of current flow in the primary winding, not more than 30% of the period T of the signal delivered by the magnetic generator so as not to cause excessive heating of the switch electronic.
  • the invention relates to a circuit attenuating the amplitude of the signals coming from the magnetic generator, for triggering the ignition signals, which attenuating circuit comprises an element whose impedance varies as a function of the increase in the speed of rotation of the internal combustion engine so as to obtain, at the idling speed of said engine, a predetermined duration of the passage of current in the primary winding of the ignition coil without modification of the starting speed of said engine.
  • said attenuator circuit consists of a first resistor, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor being connected to the common point of a second resistor and a capacitor whose other ends are connected to the negative pole of the device.
  • said attenuator circuit consists of a resistor, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor being connected to one end of the capacitor whose other end is connected to the negative pole of the device.
  • the electronic ignition control device shown diagrammatically in FIG. 1, comprises a magnetic generator 1, a rotor 2 and an induced winding 3 housed in the case of the ignition distributor 4 rotated by the internal combustion engine, at a speed half that of said engine.
  • the signals delivered by the magnetic generator 1 are transformed into square signals inside the monolithic circuit 5, by shaping means (not shown) comprising two inputs, one of which, input 7, is directly connected at the negative pole of the device, the other input, input 6 being connected to one of the ends of the induced winding 3, by a fixed rate attenuator circuit, signals from the magnetic generator 1, which attenuator circuit is consisting of a voltage divider bridge made up of external resistors 8 and 9 (see figure 1).
  • a feedback circuit (not shown) consisting of transistors and resistors creates hysteresis between inputs 6 and 7 (see figure 5 line A) so as to have a trigger threshold for value shaping means equal to ⁇ 70 millivolts, value centered on the mean line of the positive and negative amplitudes of the signal from the magnetic generator.
  • the shaping means deliver square-shaped signals as shown by line B in FIG. 5.
  • the duration t1 of these signals corresponds to the time of passage of the current in the primary winding 24 of the ignition coil 22, and consequently conditions the energy available at the electrodes of the spark plugs to produce sparks capable of ignite the mixture.
  • the monolithic circuit 5 is connected to external elements comprising the resistors 10, 11, 12, 13, 14, 15 and the capacitors 16, 17, 18 and 19 capable of ensuring its operation from the battery 20.
  • the device is powered up by means of the ignition key 21.
  • the ignition coil 22 comprises a secondary winding 23, connected to the distributor 4, the primary winding 24 is connected, in series, with an electronic switch 25 whose input 26 is connected to the battery 20, by means of the ignition key 21 and resistors 27, 28 whose common point is connected to the output of the monolithic circuit.
  • the input 26 of the electronic switch 25 is biased by a resistor 29.
  • the output of the electronic switch 25 is connected to one of the ends of a comparison element 30, with a reference voltage value VR , the other end of the comparison element is connected to the negative pole of the device.
  • the attenuation circuit, at variable rate, signals from the magnetic generator consists of a first resistor 9a with an ohmic value 3.3 K ⁇ , one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor 9a being connected to the common point of a second resistor 9b of the ohmic value 6.8 K ⁇ and of a capacitor 50, of 2.2 microfarads, the other ends of the resistor 9b and of the capacitor 50 being connected to the negative pole of the device.
  • the ohmic value of the resistance 8, that is to say 10 KU remains identical to the value provided for in French patent 2416357.
  • said circuit consists of a resistor 51 of ohmic value 5 K ⁇ one end of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor 51 being connected to one of the ends of the capacitor 50, the other end of which is connected to the negative pole of the device.
  • the. ohmic value of resistors 8 and 9 is 10 K ⁇ and capacitor 50 has a capacity of 2.2 microfarads.
  • the attenuation circuit consists of a first resistor 52, of ohmic value 50 KU, connected by one of its ends to the common point of resistors 8 and 9, of ohmic value 10 Kn for each of them, the other end of the resistor 52 being connected to the input 6 of the monolithic circuit 5.
  • the attenuator circuit comprises a second resistor 51 a, of ohmic value 50 K ⁇ , connected by one of its ends, to the input 6 of the monolithic circuit 5, and by its other end, to a capacitor 50a , with a value of 0.22 microfarads, which capacitor is connected by its other end to the negative pole of the device.
  • the duration of current flow in the primary winding of the ignition coil is reduced to 30% of the period T of said signals (see Figure 5 line B), at the idle speed of the combustion engine, without changing the starting speed.
  • line A the dotted lines represent the amplitude of the signals coming from the magnetic generator, by a fixed rate of attenuation of 50% as provided for in French patent 2416357.
  • the duration t1 of the passage of current in the primary winding of the ignition coil reaches 45% of the period T of the signals coming from the magnetic generator (see lines A and B). This period would produce excessive heating of the electronic switch 25 constituting the output stage of the device. Consequently, the attenuation circuits of the invention, variable rate attenuation circuits, reduce this duration to 30% ( Figure 5 line B) by the automatic variation of the impedance of the capacitor 50 or 50a depending the increase in the rotation speed of the internal combustion engine.
  • the attenuation rate which is 50% at the starting speed varies progressively to reach a rate of around 70% at the idling speed, the amplitude of the signals coming from the magnetic generator being attenuated as shown in solid lines at line A in Figure 5.
  • the triggering threshold of the shaping means being fixed at ⁇ 70 millivolts, a duration t1 ′ (line C) is thus obtained corresponding to 30% of the period T.
  • resistors 8, 9, 9a have an ohmic value sufficiently low for parasitic currents, which could disturb the operation of the device, to be derived directly to ground.
  • the drawback of the first and second embodiments is that the low ohmic value of the resistors requires the use of a capacitor of 2.2 microfarads, a capacitor whose volume is not always compatible with the dimensions available. to house the device.
  • the third embodiment overcomes this drawback by adding the resistor 52 which allows the use of a 0.22 microfarad capacitor which can easily be accommodated in the volume available.
  • the invention is not limited to the three embodiments described and that it includes all the circuits which, by their equivalence, allow obtaining a variable attenuation rate of the amplitude of the signals from a magnetic generator, so that at the idling speed of the internal combustion engine, the duration of current flow in the primary winding is equal to approximately 30% of the period T of the signals from the magnetic generator , said duration not causing any modification of the engine starting speed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP19810400964 1980-08-13 1981-06-17 Dispositif électronique de commande d'allumage de moteur à combustion interne Expired EP0046092B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8017811A FR2488741A2 (fr) 1980-08-13 1980-08-13 Dispositif electronique de commande d'allumage pour moteurs a combustion interne
FR8017811 1980-08-13

Publications (2)

Publication Number Publication Date
EP0046092A1 EP0046092A1 (fr) 1982-02-17
EP0046092B1 true EP0046092B1 (fr) 1984-03-21

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ID=9245148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810400964 Expired EP0046092B1 (fr) 1980-08-13 1981-06-17 Dispositif électronique de commande d'allumage de moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP0046092B1 (2)
DE (1) DE3162786D1 (2)
ES (1) ES8206105A1 (2)
FR (1) FR2488741A2 (2)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605713A (en) * 1970-05-18 1971-09-20 Gen Motors Corp Internal combustion engine ignition system
DE2649733A1 (de) * 1976-10-29 1978-05-03 Bosch Gmbh Robert Zuendanlage fuer brennkraftmaschinen
DE2729505C2 (de) * 1977-06-30 1985-05-23 Robert Bosch Gmbh, 7000 Stuttgart Zündeinrichtung für Brennkraftmaschinen
FR2416357A1 (fr) * 1978-02-02 1979-08-31 Ducellier & Cie Dispositif electronique de commande d'allumage pour moteur a combustion interne

Also Published As

Publication number Publication date
DE3162786D1 (en) 1984-04-26
ES504325A0 (es) 1982-08-16
FR2488741A2 (fr) 1982-02-19
EP0046092A1 (fr) 1982-02-17
ES8206105A1 (es) 1982-08-16
FR2488741B2 (2) 1984-01-06

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