EP0323318A1 - Gerät zur Steuerung und Prüfung von Kraftstoffeinspritzventilen eines Mehrzylinder-Verbrennungsmotors, insbesondere eines Zweitaktmotors - Google Patents

Gerät zur Steuerung und Prüfung von Kraftstoffeinspritzventilen eines Mehrzylinder-Verbrennungsmotors, insbesondere eines Zweitaktmotors Download PDF

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Publication number
EP0323318A1
EP0323318A1 EP88403271A EP88403271A EP0323318A1 EP 0323318 A1 EP0323318 A1 EP 0323318A1 EP 88403271 A EP88403271 A EP 88403271A EP 88403271 A EP88403271 A EP 88403271A EP 0323318 A1 EP0323318 A1 EP 0323318A1
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EP
European Patent Office
Prior art keywords
circuit
capacitor
switch
injector
input
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
EP88403271A
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English (en)
French (fr)
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EP0323318B1 (de
Inventor
Jean Lazzarini
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Publication of EP0323318A1 publication Critical patent/EP0323318A1/de
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Publication of EP0323318B1 publication Critical patent/EP0323318B1/de
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Expired - Lifetime 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F02D2041/201—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost inductance

Definitions

  • the invention relates to a device for controlling and controlling fuel injectors of an internal combustion engine advantageously multi-cylinder and in particular two-stroke, by discharging a capacitor in the winding of the needle lift control circuit. of each injector.
  • This known supply system has the major drawback that the high voltage of 250 volts is supplied by a magnetic flywheel and that each injector has its own supply.
  • the object of the present invention is to propose an injector command and control device which does not have the drawbacks which have just been stated.
  • the command and control device is characterized in that it comprises a single capacitor for a plurality of injectors, a single circuit for charging this capacitor, a switch circuit for each injector, capable of electrically connecting said capacitor to this injector and means for selective control of each switch circuit.
  • the means for selective control of the injectors comprise for each injector a control module having an input receiving an injection time signal and suitable for producing in response to this signal for durations of predetermined times respectively an output signal for closing the switch with which it is associated and an output signal for blocking the charging circuit of the capacitor.
  • an aforementioned selective control module comprises a switch circuit and control means for closing it during the duration of the injection time signal, this switch being connected on the one hand , to a low voltage source such as a battery and, on the other hand, to the output terminal of the switch, which is connected to the associated injector, the time of presence of the injection time signal being able to be greater than the above-mentioned durations of time for blocking the charging circuits of the high-voltage capacitor and closing the switch so that the phase of current flow through the injector, by discharging the high-voltage capacitor, can be extended by the flow of current from said low voltage source and, if necessary, the new charging of the capacitor for the control of another injector can begin during the injection in progress.
  • FIG. 1 shows by way of example the general structure of a command and control device for three injectors 1, 2 and 3 fitted to the engine indicated in 4.
  • These injectors are supplied from a battery 5, the terminal of which of positive potential is connected to the terminals A1, A2 and A3 respectively of the injectors 1, 2, 3 and controlled by the control block 6 to which they are connected by output terminals S1, S2 and S3.
  • the reference symbol 7 designates a computer which is adapted to give the control unit 6 the injection time signals. These signals are applied to the inputs E1, E2 and E3 of block 6. It can be seen that the positive potential terminal A6 of the battery 5 is also connected to the terminals of block 6 and computer 7 respectively.
  • FIG. 2 represents the structure of a control block 6 and comprises a converter B intended to charge a capacitor C at a high voltage of for example 250 volts from the supply voltage of the battery 5 connected between the terminals A6 and earth, three switch circuits I1, I2, I3 each connected by its output terminal S1, S2 or S3 respectively to the injectors l, 2, 3, and three modules M1, M2, M3 for selective control of the switches I1, I2 respectively and I3. It can be seen that each module M1, M2, M3 is connected by its outputs S6, S7 respectively to the inputs E6 and E7 of the switch I1, I2, I3 with which it is associated.
  • Each module is connected to an input terminal E1, E2 or E3 of the control block 6 and by an output terminal S5 to an input E5 of the converter B.
  • Each of the switches I1, I2, I3 is connected by its terminal input E4 to terminal S4 of capacitor C.
  • Each switch and module is connected to the positive potential A6 of battery 5.
  • the control modules also have a grounding terminal.
  • FIG. 3 shows the electrical assembly of the converter B charging the capacitor C at a high voltage of for example 250 volts, starting from the voltage of the battery 5 of for example 12 volts.
  • the converter also has the function of keeping the capacitor C charged at this high voltage.
  • the capacitor C is mounted in the circuit of the secondary winding ES of a transformer TR also comprising a diode D3.
  • the primary winding EP of the transformer TR is mounted in the circuit of a control member such as the transistor T4.
  • the primary winding EP is more precisely connected between the terminal A6 of positive potential of the supply voltage of the converter and the drain electrode of the transistor. The source electrode thereof is grounded.
  • the transistor T4 is connected to the joined emitters of two transistors T2, T3 of different conductivity type, the collectors of which are connected respectively to the terminal A6 for supplying DC voltage to the battery 5 and to ground.
  • the base of transistor NPN type T2 is directly connected to the base of transistor TS and by the series connection of a Zener diode Z4 and a diode D2 to the drain electrode of transistor T4.
  • the base of the transistor T2 is also connected by a resistor R13, literally, to the terminal A6 by the series connection of two resistors R9, R10 and, on the other hand, to the outputs of two comparators CO1, CO2.
  • the output of the CO2 comparator is connected to the control input E5 connected to the outputs S5 of the three control modules M1, M2, M3 ( Figure 2).
  • the positive input of the CO2 comparator is connected, on the one hand, to ground by a capacitor C3 and, on the other hand, by a resistor R3 at the common point of a resistor R2 and a potentiometer R4.
  • the free terminal of the latter is connected to the collector of a transistor T1 and to ground, via a capacitor C4.
  • the base of transistor T1 is connected to ground by a resistor R5 and to the output of the CO2 comparator by a resistor R6.
  • the T1 transmitter is grounded.
  • the free terminal of the resistor R2 is connected to the supply terminal A6 of the battery 5 by a resistor R1.
  • a Zener diode Z2 is connected between the common terminal of the resistors R1 and R2 and the ground.
  • the negative input of the CO2 comparator is connected by a parallel connection of a resistor R7 and a diode D1 to the drain electrode of the transistor T4.
  • a Zener Z3 diode is mounted between the negative input of the CO2 comparator and the mass.
  • the comparator CO1 also with two inputs, is connected via a Zener diode Z1 to the positive potential terminal A6 and to ground, via a resistor R14.
  • a capacitor C1 is connected in parallel to the Zener diode Z1.
  • the positive input of the comparator CO1 is connected by a resistor R12 to the output S4 of the capacitor C and, by a resistor R11, to the common terminal of the two resistors R9 and R10, as well as by a capacitor C2 to the terminal A6.
  • FIG. 4 and 5 show two embodiments of a switch circuit I1 identical to switches I2 or I3.
  • the embodiment according to FIG. 6 uses a TH1 thyristor photo-coupler, for example of the H11 C6 type.
  • the emitter of the photo-coupler is connected between the positive terminal A6 of the battery 5 and the input E7 of the switch ( Figure 2), via a resistor R16 for limiting the current.
  • the receiving photo-thyristor is mounted between the input terminal E4 and the output terminal S1 of the switch.
  • a resistor R17 is mounted between the trigger and the terminal E4.
  • the input E6 of the switch is connected to the output terminal S1 by a series connection of a resistor R18 and a diode D5.
  • the 5 uses a high voltage transistor T6 of the C-MOS type.
  • the source-drain circuit is connected between the input E4 and output S1 terminals.
  • the gate of transistor T6 is connected, on the one hand, by a Zener diode Z5 to the source of the transistor and, on the other hand, by a resistor R19 to the collector of a transistor T7 whose emitter is connected to the positive potential A6 of the battery 5.
  • the base of the transistor T7 is connected by a resistor R20 to the input E7 of the switch, and by a resistor R21 to the supply terminal A6.
  • the input E6 of the switch is connected to the drain electrode of transistor T6, at through the series connection of diode D5 and resistor R18 in figure 4.
  • FIG. 6 shows the electrical diagram of a control module M1 identical to the module M2 or M3, intended to control a switch as shown in FIG. 4.
  • the control module comprises two comparators CO3, CO4 whose inputs are negative and positive are connected, via a capacitor C6 to the input terminal E1 which receives the injection time signal from the computer 7 ( Figure 1). these inputs are also connected to the positive potential terminal A6 of the battery 5, by a parallel connection of a resistor R24 and a diode D6.
  • the A6 and earth terminals of the module are connected by a series connection formed by the three resistors R25, R20 and R27.
  • the common terminal of resistors R25 and R26 is connected to the negative input of the CO4 comparator.
  • comparator CO3 is connected to the gate of a transistor of the field effect type T9 connected by these source and drain electrodes respectively to ground and to the output terminal S7 for controlling the associated switch circuit.
  • the output of comparator CO3 is connected to terminal A6 of positive supply potential, by a resistor R28.
  • the output of the comparator CO4 is connected to the output terminal S5 to be connected to the input E5 of the converter 8 ( Figures 2, 3).
  • the input E1 of the control module is also connected by a resistor R29 to the gate of a field effect transistor T10.
  • This grid is also connected by a resistor R30 to the supply terminal A6.
  • the source and drain electrodes of transistor T10 are respectively connected to ground and, by via a resistor R31, at terminal A6.
  • the drain electrode further attacks, via a resistor R32, the base of a transistor T11 which is connected by its emitter to ground and by its collector to the output terminal S6 of the control module, intended to be connected to input E6 of the associated switch.
  • the base and the collector of the transistors T11 are connected by a Zener diode Z6.
  • FIG. 7 shows another embodiment of a control module M1, M2 or M3, for example of the module M1 intended to control a switch as shown in FIG. 5, which differs from the control module according to FIG. 6 by the fact that it uses only one comparator CO5, the positive input of which is connected to the capacitor C6, like the comparator CO4 of FIG. 6.
  • the negative input of the comparator CO5 is connected to the common terminal of two resistors R33, R34 which are connected by their free terminals respectively to the supply terminal A6 and to ground.
  • the output of the CO5 comparator is directly connected to the S7 output of the module and, via a diode D7, to the S5 output.
  • the function of the high voltage converter 8 is to charge the capacitor C at high voltage and keep it charged.
  • the computer 7 applies an injection time signal SI to the input E1 of the control block 6.
  • this module closes the switch circuit I1 , which causes the discharge of the capacitor C through the injector 1, via this switch, and the blocking of the converter 8 during the time of this discharge.
  • the control module M1 maintains a current in the injector throughout the injection time. To this end, even after the discharge of the capacitor C, the injector can be traversed by a current coming from the battery 5 until the end of the signal SI of injection time. Thus the recharging of the capacitor C for controlling the next switch can already start before the end of the previous injection.
  • the cycle which has just been described, is repeated successively for the other injectors 2, 3 via the inputs E2 and E3 implementing respectively the control modules M2, M3 and the switches I2 and I3, in the order imposed by the computer 7.
  • the charging of the capacitor C is done in several cycles.
  • the CO1 and CO2 comparators do not drive.
  • the transistor T1 is conductive and short-circuits the capacitor C4.
  • the transistor T4 also conducts, via the transistor T2, polarized by the resistors R13, R9 and R10.
  • a current is established in the primary winding EP of the transformer TR.
  • the drain-source voltage V DS of the transistor T4 which is equal to the product of the current passing through the primary winding by the resistance of T4 reaches the value the CO2 comparator is made conductive, which causes the transistor T4 to block through the transistor T3 biased by the resistor R13.
  • the voltage V DS increases and the Zener diode Z3 leads through the resistor R7 by imposing this voltage on the negative input of the CO2 comparator.
  • the choice of voltage V Z3 is as follows: Vi ⁇ V Z3 ⁇ V Z2 . Since the transistor T1 is also blocked, the capacitor C4 charges through the resistors R2, R4. When the voltage of the positive input of the CO2 comparator reaches the value V Z3 of the Zener diode Z3, the comparator no longer conducts (the charging time of the capacitor C4 thus giving the blocking time of the transistor T4), the transistor T4 becomes conductive again and the voltage of the negative input of the CO2 comparator becomes equal to V DS , the diode D1 serving to cancel the capacitor effect of the diode Z3. Similarly the transistor T1 is conductive discharging the capacitor C4 and the voltage of the positive input of the CO2 comparator becomes equal to Vi. A new cycle can then begin.
  • the transistor T4 When the transistor T4 is blocked, the energy stored in the primary choke of the primary winding ER of the transformer TR is transferred to the secondary winding ES of the latter and the capacitor C is charged through the diode D3.
  • the charging voltage of the capacitor C is compared, through the voltage gauge R11, R12 to the voltage V Z1 of the Zener diode Z1, by the comparator CO1.
  • the comparator CO1 When there is equality of the two voltages at these inputs, the comparator CO1 becomes conductive, which stops the operation of the converter, as long as the capacitor C is sufficiently charged.
  • the combination of resistors R9, R10 gives the value of the hysteresis voltage of the comparator CO1.
  • the input E5 is set to level 0 by the signal produced at the output S5 of the control module , which ensures the blocking of the converter during this discharge.
  • the injection time signal Si is manifested at the input E1 by switching to "0" of the potential present at this input.
  • the signal Si causes the blocking of the transistor T10, which makes the transistor T11 conductive. Consequently, a current can flow through the transistor T11, the output terminal S6 of the module M1, the input E6 of the switch according to FIG. 4, the output terminal S1 of the switch and the injector 1 between ground and the positive pole of the battery 5.
  • the capacitor C6 is charged through the resistor R24.
  • the injection time signal Si at the input E1 of the module M1 causes the comparator CO4 to conduct for the duration of time that the capacitor C6 takes to charge at the voltage at the common terminal of the resistors R25 and R26. During this time interval, the comparator CO4 produces at its output S5 the blocking signal of the converter 8, which the latter receives at its input E5 (FIG. 3).
  • the device according to the invention makes it possible to have only one high voltage source charging a single capacitor to supply several injectors.
  • the use of high voltage switches such as I1, I2, I3 makes it possible to isolate the injectors 1, 2, 3 from the high voltage source and to extend the passage of current through it using the low voltage source supplying this device with a view to maintaining the injector. consequently the passage of a current through a switch and the recharging of the high-voltage capacitor C for the control of another switch can therefore partially overlap when the signal injection time signal Si is greater than l time interval for charging the capacitor C6 of the module M1 corresponding to the threshold voltage of the comparator CO4.
  • the invention makes it possible to vary the injection time within significant limits.
  • the device according to the invention can easily be controlled by a computer based on a microprocessor.
  • the production of the device according to the invention does not require the use of expensive components.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP19880403271 1987-12-28 1988-12-21 Gerät zur Steuerung und Prüfung von Kraftstoffeinspritzventilen eines Mehrzylinder-Verbrennungsmotors, insbesondere eines Zweitaktmotors Expired - Lifetime EP0323318B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8718234A FR2625260B1 (fr) 1987-12-28 1987-12-28 Dispositif de commande et de controle d'injecteurs de combustible d'un moteur a combustion interne multicylindre notamment a deux temps
FR8718234 1987-12-28

Publications (2)

Publication Number Publication Date
EP0323318A1 true EP0323318A1 (de) 1989-07-05
EP0323318B1 EP0323318B1 (de) 1992-05-06

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EP19880403271 Expired - Lifetime EP0323318B1 (de) 1987-12-28 1988-12-21 Gerät zur Steuerung und Prüfung von Kraftstoffeinspritzventilen eines Mehrzylinder-Verbrennungsmotors, insbesondere eines Zweitaktmotors

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EP (1) EP0323318B1 (de)
DE (1) DE3870844D1 (de)
FR (1) FR2625260B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0478436A1 (de) * 1990-09-28 1992-04-01 Regie Nationale Des Usines Renault S.A. Kraftstoffeinspritzsteuervorrichtung in einer Brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU801130A1 (ru) * 1979-04-26 1981-01-30 Предприятие П/Я В-2309 Устройство дл форсированногоВКлючЕНи элЕКТРОМАгНиТА
EP0034076A2 (de) * 1980-02-01 1981-08-19 The Bendix Corporation System zur Steuerung eines Solenoiden
EP0049183A1 (de) * 1980-10-01 1982-04-07 The Bendix Corporation Kraftstoffsteuerungssystem für eine Diesel-Brennkraftmaschine und Verfahren, um den Injektor einer solchen Maschine zu betätigen
EP0106743A2 (de) * 1982-09-27 1984-04-25 AlliedSignal Inc. Schaltertyp-Schaltung für Kraftstoffeinspritzventil
FR2538942A1 (fr) * 1982-12-29 1984-07-06 Renault Dispositif de commande d'organe(s) electromagnetique(s) a actionnement rapide, tel(s) qu'electrovanne(s) ou injecteur(s)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU801130A1 (ru) * 1979-04-26 1981-01-30 Предприятие П/Я В-2309 Устройство дл форсированногоВКлючЕНи элЕКТРОМАгНиТА
EP0034076A2 (de) * 1980-02-01 1981-08-19 The Bendix Corporation System zur Steuerung eines Solenoiden
EP0049183A1 (de) * 1980-10-01 1982-04-07 The Bendix Corporation Kraftstoffsteuerungssystem für eine Diesel-Brennkraftmaschine und Verfahren, um den Injektor einer solchen Maschine zu betätigen
EP0106743A2 (de) * 1982-09-27 1984-04-25 AlliedSignal Inc. Schaltertyp-Schaltung für Kraftstoffeinspritzventil
FR2538942A1 (fr) * 1982-12-29 1984-07-06 Renault Dispositif de commande d'organe(s) electromagnetique(s) a actionnement rapide, tel(s) qu'electrovanne(s) ou injecteur(s)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0478436A1 (de) * 1990-09-28 1992-04-01 Regie Nationale Des Usines Renault S.A. Kraftstoffeinspritzsteuervorrichtung in einer Brennkraftmaschine
FR2667357A1 (fr) * 1990-09-28 1992-04-03 Renault Dispositif de commande d'injecteurs de combustible dans un moteur a combustion interne.

Also Published As

Publication number Publication date
DE3870844D1 (de) 1992-06-11
EP0323318B1 (de) 1992-05-06
FR2625260A1 (fr) 1989-06-30
FR2625260B1 (fr) 1993-09-24

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