EP0195194A2 - Control device for electromagnetically time-controlled injection valves - Google Patents

Control device for electromagnetically time-controlled injection valves Download PDF

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Publication number
EP0195194A2
EP0195194A2 EP86100974A EP86100974A EP0195194A2 EP 0195194 A2 EP0195194 A2 EP 0195194A2 EP 86100974 A EP86100974 A EP 86100974A EP 86100974 A EP86100974 A EP 86100974A EP 0195194 A2 EP0195194 A2 EP 0195194A2
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EP
European Patent Office
Prior art keywords
fuel injection
resistor
injection valve
fuel
valve
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.)
Ceased
Application number
EP86100974A
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German (de)
French (fr)
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EP0195194A3 (en
Inventor
Horst Schlick
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Mannesmann VDO AG
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Mannesmann VDO AG
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Publication date
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Publication of EP0195194A2 publication Critical patent/EP0195194A2/en
Publication of EP0195194A3 publication Critical patent/EP0195194A3/en
Ceased 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2432—Methods of calibration
    • F02D41/2435—Methods of calibration characterised by the writing medium, e.g. bar code
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • 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
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2031—Control of the current by means of delays or monostable multivibrators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/16—End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor

Definitions

  • the invention relates to a device for time-controlled activation of electromagnetically actuated fuel injection valves according to the preamble of claim 1.
  • Devices of this type are used, in particular, for metering the fuel into the intake system of gasoline engines.
  • Known devices of this type comprise means, in particular a monoflop, for forming current pulses, the length of which depends on a control variable, in particular the amount of air drawn in.
  • the current pulses, the pulse length or pulse duration of which is determined by the monoflop, are amplified with a driver in order to excite the solenoid or excitation coil of the fuel injector with the required power in such a way that a valve needle is removed from its valve seat and fuel during one of the pulse length or pulse duration corresponding time is injected into the intake system.
  • fuel injection valves belonging to the prior art consist of a nozzle body with a magnet winding arranged inside a valve housing and a soft iron core, which form the magnetic coil. This interacts with an opposing armature which is connected to a valve needle guided in the nozzle body (DE-PS 23 49 584).
  • the present invention is based on the object of designing a device for time-controlled activation of electromagnetically actuated fuel injection valves and in particular the fuel injection valves themselves in such a way that the desired injection quantities can be metered in a closely tolerated manner with the fuel injection valves.
  • the invention is based on the principle that a very narrowly tolerated mechanical adjustment is dispensed with, instead the so-called identifier of each finished - and possibly roughly mechanically adjusted - fuel injector is detected, the identifier is queried with the injection electronics and the identifier is used to form the relevant one Corrective consideration of the fuel injection valve exciting current pulse.
  • the pulse duration or length of these current pulses is thus not only determined as usual by a control variable, in particular the amount of air sucked in by the internal combustion engine, but also by the identifier of the fuel injection valve with which the fuel is metered in.
  • the identifier is the ratio of the injection quantity to the actuation time of the fuel injection valve, the Control time is equal to the pulse duration of the exciting current pulse.
  • the identifier is unmistakably and permanently assigned to this fuel injection valve by the dimensioning of the electrical component which is attached to or in the fuel injection valve.
  • the electrical component which contains the identifier, consists of an electrical resistor, the resistance value of which is a measure of the identifier (injection quantity at the actuation time).
  • the electrical resistance is preferably arranged in an insulating part of the fuel injection valve, plug tongues being accommodated in the insulating part, via which the fuel injection valve is usually connected to the engine electronics.
  • an additional connector tongue is preferably used, to which the resistor is electrically connected, while the resistor, on the other hand, can be connected to one of the connector tongues, which are usually used to supply the current pulses to the magnetic coil.
  • the component is thus electrically connected to two plug tongues in the insulating part.
  • the electrical processing of the dimensioning of the electrical component containing the identifier is specified in Claim 5. Thereafter, the pulse duration or length of current pulses for energizing a solenoid coil of a fuel injector is not only determined as before by a control variable, in particular the amount of air drawn in, but also by dimensioning the component containing the identifier.
  • a control variable in particular the amount of air drawn in
  • dimensioning the component containing the identifier This can preferably be done according to claim 5 in that the electrical component is connected via an analog-digital converter and a table memory, in particular a ROM, to the means for forming the current pulses, these means being designed such that the current pulse length is formed by the size of the electrical component is influenced.
  • the current pulse length in addition to the control variable - air quantity - which controls the monoflop in the usual way, can be achieved by additionally controlling this monoflop with a correction variable which is also determined from the table memory in accordance with the electrical variable read out from the electrical component.
  • each fuel injection valve that is used in an injection system is permanently assigned an individual electronic component that contains the identifier of the corresponding fuel injection valve, and because the size of these electrical components can be queried separately and to correct the pulse duration of the current pulses that are fed into the fuel injection valve in question can be fed individually, the device with the fuel injection valves enables significantly improved synchronization of the four, six or eight Nozzles of a so-called multipoint injection than in a known conventional mechanically adjusted nozzle. This also results in fuel savings and a reduction in the pollutants released with the exhaust gas.
  • Fig. 1 denotes a valve housing, in the bore 2, a solenoid 3 is housed.
  • An armature 4 faces the magnet coil. The armature is pushed away by a closing spring 5 when the magnet coil is not energized and is drawn toward the magnet coil when the magnet coil is energized.
  • a valve needle 6 is connected to the armature.
  • the valve needle is pressed under the action of the closing spring 5 against a valve seat 7 and closes the fuel injection valve in this state.
  • the fuel is supplied via a fuel connection 8, a longitudinal bore 9, various free spaces including the longitudinal grooves 10 and 11 up to an annular shape 12 upstream of the valve seat.
  • the magnetic coil 3 To excite the magnetic coil 3, it is connected via a line (not visible in the drawing) to two plug tongues, which are accommodated in an insulating part 13.
  • One connector tongue 14 can be seen in the drawing, while two further connector tongues are not shown.
  • a resistor 16 is embedded in a recess 15, the resistance value of which is dimensioned proportionally to the identifier of the fuel injection valve, namely the injection quantity at the actuation time.
  • a lead 17 of the resistor is also connected to the tongue 14, while a second connection of the resistor to one of the other tongues is not visible in the drawing.
  • FIG. 2 shows the device for time-controlled activation of the fuel injection valve according to FIG. 1.
  • the injection electronics shown in FIG. 2 are generally part of a more extensive injection electronics system, with which a plurality of fuel injection valves of the type shown in FIG. 1 can be controlled.
  • An essential component of the injection electronics is a monoflop 18, the duration of which can be varied proportionally by a voltage signal at an input 19.
  • the voltage signal is generated by an air quantity sensor 20, which detects the air quantity drawn in by the internal combustion engine.
  • the pulse is amplified by a driver 22 and supplied to the magnetic coil 3 via a tongue 23, so that it is excited during the duration of the pulses.
  • the fuel injection valve, to which the solenoid 3 belongs doses an amount of fuel into the intake system that is proportional to the pulse duration. The amount depends on the identifier of the fuel injector, i.e. the ratio of injection quantity to actuation time, depending on the design and production.
  • This identifier, or deviations of the identifier from a target value can be read from a resistor 16, the resistance value of which has been set or selected in accordance with the identifier or deviation from the identifier.
  • This resistance with the specified resistance value is part of the fuel injection valve according to FIG. 1.
  • the resistance value queried by the resistor is fed via an analog-digital converter 24 as an address into a table stored with a ROM 25. Correction quantities are assigned to the addresses in the table. A correction value corresponding to the resistance value of the resistor 16 is read from the table of the ROM 25 and fed into a second input 26 of the monoflop.
  • the internal structure of the monoflop allows the pulse duration or length, which is initially determined by the control variable in accordance with the amount of air, to be corrected in accordance with the correction variable from the table in ROM 25.
  • the monoflop thus produces a pulse of such a long pulse duration that the amount of fuel metered by the associated fuel injector is exactly the same as the amount of fuel when the fuel injector reaches the setpoint of the identifier, ie the on injection target quantity, would have at the control time.
  • the pulse duration formed by the monoflop 18 without a correction quantity is lengthened or shortened to the extent that it corresponds to the deviation of the identifier of the associated fuel injector from the target value of the identifier.

Abstract

In a device for the time-controlled activation of electromagnetically actuable fuel injection valves of internal-combustion engines, the injection electronics provided open the fuel injection valve by means of a current pulse as a function of a control variable, the air quantity. Since the quantity of fuel metered in for a current pulse of predetermined duration depends on the characteristic of the fuel injection valve, i.e. deviations from a setpoint characteristic, an electrical resistor (16) is arranged on each fuel injection valve (1-14), the said resistor being dimensioned in proportion to the characteristic quantity, or deviation from the setpoint characteristic quantity, of the fuel injection valve. The resistor is connected to the injection electronics (18, 22) for influencing the injection time, in order to compensate the deviations of the characteristic from a setpoint. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zur zeitgesteuerten Ansteuerung elektromagnetisch betätigbarer Kraftstoffeinspritzventile nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for time-controlled activation of electromagnetically actuated fuel injection valves according to the preamble of claim 1.

Derartige Einrichtungen werden insbesondere zur Zumessung des Kraftstoffes in das Ansaugsystem von Ottomotoren eingesetzt.Devices of this type are used, in particular, for metering the fuel into the intake system of gasoline engines.

Derartige bekannte Einrichtungen umfassen Mittel, insbesondere ein Monoflop zur Bildung von Stromimpulsen, deren Länge von einer Steuergröße,insbesondere der angesaugten Luftmenge, abhängt. Die Stromimpulse, deren Impulslänge oder Impulsdauer durch das Monoflop bestimmt wird, werden mit einem Treiber verstärkt, um mit der erforderlichen Leistung die Magnetspule oder Erregerspule des Kraftstoffeinspritzventiles so zu erregen, daß eine Ventilnadel von ihrem Ventilsitz entfernt wird und Kraftstoff während einer der Impulslänge oder Impulsdauer entsprechenden Zeit in das Ansaugsystem eingespritzt wird.Known devices of this type comprise means, in particular a monoflop, for forming current pulses, the length of which depends on a control variable, in particular the amount of air drawn in. The current pulses, the pulse length or pulse duration of which is determined by the monoflop, are amplified with a driver in order to excite the solenoid or excitation coil of the fuel injector with the required power in such a way that a valve needle is removed from its valve seat and fuel during one of the pulse length or pulse duration corresponding time is injected into the intake system.

Im einzelnen bestehen zum Stand der Technik gehörende Kraftstoffeinspritzventile aus einem Düsenkörper mit einer innerhalb eines Ventilgehäuses angeordneten Magnetwicklung und einem Weicheisenkern, welche die Magnetspule bilden. Diese wirkt mit einem gegenüberstehenden Anker zusammen, der mit einer in dem Düsenkörper geführten Ventilnadel verbunden ist (DE-PS 23 49 584).In particular, fuel injection valves belonging to the prior art consist of a nozzle body with a magnet winding arranged inside a valve housing and a soft iron core, which form the magnetic coil. This interacts with an opposing armature which is connected to a valve needle guided in the nozzle body (DE-PS 23 49 584).

Zur Zumessung der gewünschten Kraftstoffmenge in das Ansaugsystem, insbesondere ein Saugrohr eines Ottomotors,besteht das Problem, daß einemmit der voranstehend beschriebenen Motorelektronik erzeugten elektrischen Impuls vorgegebener Dauer oder Länge eine entsprechende Einspritzmenge zuzuordnen ist. Dies setzt eine genaue Justierung der Kraftstoffeinspritzventile voraus. Der Justieraufwand ist in der Regel erheblich, da er nach dem Ausmessen eines Kraftstoffeinspritzventils häufig eine Demontage, Neueinstellung und wiederholte Messung bedeutet, bis das Kraftstoffeinspritzventil die gewünschte Einspritzmenge im Verhältnis zur Ansteuerzeit bzw. Impulsdauer oder -länge dosiert. Die Lösung dieses Problems ist bisher in einer geeigneten Herstellung des Kraftstoffeinspritzventils gesucht worden. Beispielsweise hat man erkannt, daß die Lage des Ankers zur Ventilnadel streuen kann, woraus sich u.a. die Notwendigkeit der Justierung des Ventilnadelhubs und damit ein relativ großer fertigungstechnischer Aufwand ergeben. Um den Ventilnadelhub in den erforderlichen engen Toleranzen zu halten, ist eine besondere Verbindung zwischen dem Anker und der Ventilnadel bekannt, die sich dadurch auszeichnet, daß das in der Bohrung des Ankers aufgenommene Ende der Ventilnadel mit ringförmigen, durch eingearbeitete Ringnuten gebildeten Stegen versehen ist und eine Preßverbindung des Ventilnadelendes mit dem Anker durch An- und Einpressen der Wand der das Ventilnadelende aufnehmenden Bohrung des Ankers an die Umfangsflächen der Stege und die zwischen diesen liegenden Ringnuten erfolgt (DE-PS 23 49 584). Mit dieser speziellen Lösung sind aber nicht alle Einflüsse, welche die Dosierung der Einspritzmenge zu Ansteuerzeit des elektromagnetisch betätigten Kraftstoffeinspritzventils beeinflussen, erfaßt.To meter the desired amount of fuel into the intake system, in particular an intake manifold of a gasoline engine, there is the problem that a corresponding injection amount is to be assigned to an electrical pulse of a predetermined duration or length generated with the engine electronics described above. This requires a precise adjustment of the fuel injection valves. The adjustment effort is generally considerable, since after measuring a fuel injection valve it often means dismantling, readjusting and repeated measurement until the fuel injection valve doses the desired injection quantity in relation to the actuation time or pulse duration or length. The solution to this problem has hitherto been sought in a suitable production of the fuel injection valve. For example, it has been recognized that the position of the armature in relation to the valve needle can vary, which among other things results in the need for adjustment of the valve needle stroke and thus in a relatively large production outlay. In order to keep the valve needle stroke within the required narrow tolerances, a special connection between the armature and the valve needle is known, which is characterized in that the end of the valve needle received in the bore of the armature is provided with annular webs formed by incorporated ring grooves and a press connection of the valve needle end with the armature by pressing and pressing the wall of the valve needle end receiving bore of the armature on the peripheral surfaces of the webs and the ring grooves lying between them (DE-PS 23 49 584). With this However, not all influences influencing the metering of the injection quantity at the actuation time of the electromagnetically actuated fuel injection valve are recorded in a special solution.

Demgemäß liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Einrichtung zur zeitgesteuerten Ansteuerung elektromagnetisch betätigbarer Kraftstoffeinspritzventile und insbesondere die Kraftstoffeinspritzventile selbst so auszubilden, daß mit den Kraftstoffeinspritzventilen die gewünschten Einspritzmengen eng toleriert dosiert werden können.Accordingly, the present invention is based on the object of designing a device for time-controlled activation of electromagnetically actuated fuel injection valves and in particular the fuel injection valves themselves in such a way that the desired injection quantities can be metered in a closely tolerated manner with the fuel injection valves.

Diese Aufgabe wird durch die Ausbildung der Einrichtung, insbesondere der Kraftstoffeinspritzventile, mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by the design of the device, in particular the fuel injection valves, with the features of claim 1.

Die Erfindung beruht auf dem Prinzip, daß man auf eine sehr eng tolerierte mechanische Justierung verzichtet, statt dessen die sogenannte Kennung jedes fertiggestellten - und gegebenenfalls grob mechanisch justierten - Kraftstoffeinspritzventils erfaßt, die Kennung mit der Einspritzelektronik abfragt und die Kennung bei der Bildung des das betreffende Kraftstoffeinspritzventil erregenden Stromimpulses korrigierend berücksichtigt. Die Impulsdauer bzw. -länge dieser Stromimpulse wird somit nicht nur mehr wie üblich von einer Steuergröße, insbesondere der angesaugten Luftmenge des Verbrennungsmotors, bestimmt, sondern zusätzlich durch die Kennung des Kraftstoffeinspritzventils, mit dem der Kraftstoff zudosiert wird.The invention is based on the principle that a very narrowly tolerated mechanical adjustment is dispensed with, instead the so-called identifier of each finished - and possibly roughly mechanically adjusted - fuel injector is detected, the identifier is queried with the injection electronics and the identifier is used to form the relevant one Corrective consideration of the fuel injection valve exciting current pulse. The pulse duration or length of these current pulses is thus not only determined as usual by a control variable, in particular the amount of air sucked in by the internal combustion engine, but also by the identifier of the fuel injection valve with which the fuel is metered in.

Die Kennung ist dabei das Verhältnis der Einspritzmenge zu der Ansteuerzeit des Kraftstoffeinspritzventils, wobei die Ansteuerzeit gleich der Impulsdauer des erregenden Stromimpulses ist.The identifier is the ratio of the injection quantity to the actuation time of the fuel injection valve, the Control time is equal to the pulse duration of the exciting current pulse.

Die Kennung wird durch die Dimensionierung des elektrischen Bauelements, welches an bzw. in dem Kraftstoffeinspritzventil angebracht ist, diesem Kraftstoffeinspritzventil unverwechsel bar und unverlierbar zugeordnet.The identifier is unmistakably and permanently assigned to this fuel injection valve by the dimensioning of the electrical component which is attached to or in the fuel injection valve.

Insbesondere besteht das elektrische Bauelement, welches die Kennung beinhaltet, aus einem elektrischen Widerstand, dessen Widerstandswert ein Maß für die Kennung (Einspritzmenge zur Ansteuerzeit) ist.In particular, the electrical component, which contains the identifier, consists of an electrical resistor, the resistance value of which is a measure of the identifier (injection quantity at the actuation time).

Der elektrische Widerstand wird bevorzugt in einem Isolierteil des Kraftstoffeinspritzventils angeordnet, wobei in dem Isolierteil Steckerzungen untergebracht sind, über die das Kraftstoffeinspritzventil üblicherweise an die Motorelektronik angeschlossen wird. Zum Anschluß des elektrischen Widerstands dient bevorzugt eine zusätzliche Steckerzunge, mit der der Widerstand elektrisch verbunden ist, während der Widerstand andererseits mit einer der Steckerzungen in Verbindung stehen kann, die zur Zuführung der Stromimpulse an die Magnetspule üblicherweise dienen.The electrical resistance is preferably arranged in an insulating part of the fuel injection valve, plug tongues being accommodated in the insulating part, via which the fuel injection valve is usually connected to the engine electronics. To connect the electrical resistance, an additional connector tongue is preferably used, to which the resistor is electrically connected, while the resistor, on the other hand, can be connected to one of the connector tongues, which are usually used to supply the current pulses to the magnetic coil.

Das Bauelement ist somit elektrisch mit zwei Steckerzungen in dem Isolierteil verbunden.The component is thus electrically connected to two plug tongues in the insulating part.

Die elektrische Verarbeitung der Dimensionierung des die Kennung beinhaltenden elektrischen Bauelements ist in Anspr 5 angegeben. Danach wird die Impulsdauer oder -länge von Stromimpulsen zur Erregung einer Magnetspule eines Kraftstoffeinspritzventils nicht nur wie bisher durch eine Steuergröße, insbesondere die angesaugte Luftmenge, bestimmt, sondern zusätzlich durch die Dimensionierung des die Kennung beinhaltenden Bauelements. Dies kann nach Anspruch 5 bevorzugt dadurch erfolgen, daß das elektrische Bauelement über einen Analog-Digital-Umsetzer und einen Tabellenspeicher, insbesondere einem ROM, mit den Mitteln zur Bildung der Stromimpulse in Verbindung steht, wobei diese Mittel so ausgebildet sind, daß die Stromimpulslänge durch die Größe des elektrischen Bauelements beeinflußt wird. Insbesondere kann die Stromimpulslänge außer durch die Steuergröße - Luftmenge - die das Monoflop in üblicher Weise ansteuert, durch zusätzliche Ansteuerung dieses Monoflops mit einer Korrekturgröße erfolgen, die aus dem Tabellenspeicher nach Maßgabe der elektrischen Größe mitbestimmt wird, die aus dem elektrischen Bauelement ausgelesen wird.The electrical processing of the dimensioning of the electrical component containing the identifier is specified in Claim 5. Thereafter, the pulse duration or length of current pulses for energizing a solenoid coil of a fuel injector is not only determined as before by a control variable, in particular the amount of air drawn in, but also by dimensioning the component containing the identifier. This can preferably be done according to claim 5 in that the electrical component is connected via an analog-digital converter and a table memory, in particular a ROM, to the means for forming the current pulses, these means being designed such that the current pulse length is formed by the size of the electrical component is influenced. In particular, the current pulse length, in addition to the control variable - air quantity - which controls the monoflop in the usual way, can be achieved by additionally controlling this monoflop with a correction variable which is also determined from the table memory in accordance with the electrical variable read out from the electrical component.

Es ist aber auch denkbar, die Dauer der Stromimpulslänge, die in üblicher Weise mit dem Monoflop lediglich in Abhängigkeit von der Steuergröße - Luftmenge - gebildet ist, in einer dem Monoflop nachgeschalteten Stufe mit einem Faktor zu verändern (multiplizieren), der ebenfalls dem Tabellenspeicher in Abhängigkeit von der Größe des elektrischen Bauelements entnommen wird.However, it is also conceivable to change (multiply) the duration of the current pulse length, which is formed in the usual way with the monoflop only as a function of the control variable - air quantity - in a stage downstream of the monoflop, which is also in the table memory Depending on the size of the electrical component is taken.

Da jedem Kraftstoffeinspritzventil, welches in einer Einspritzanlage eingesetzt wird, ein individuelles elektronisches Bauelement fest zugeordnet ist, welches die Kennung des entsprechenden Kraftstoffeinspritzventils beinhaltet, und da die Größe dieser elektrischen Bauelemente getrennt abfragbar und zur Korrkektur der Impulsdauer der Stromimpulse, die in das betreffende Kraftstoffeinspritzventil eingespeist werden, individuell einspeisbar ist, ermöglicht die Einrichtung mit den Kraftstoffeinspritzventilen einen erheblich verbesserten Gleichlauf der vier, sechs oder acht Düsen einer sogenannten Multipointeinspritzung als bei einer vorbekannten konventionellen mechanisch justierten Düse. Daraus ergibt sich auch eine Kraftstoffeinsparung und eine Verminderung der mit dem Abgas freigesetzten Schadstoffe.Because each fuel injection valve that is used in an injection system is permanently assigned an individual electronic component that contains the identifier of the corresponding fuel injection valve, and because the size of these electrical components can be queried separately and to correct the pulse duration of the current pulses that are fed into the fuel injection valve in question can be fed individually, the device with the fuel injection valves enables significantly improved synchronization of the four, six or eight Nozzles of a so-called multipoint injection than in a known conventional mechanically adjusted nozzle. This also results in fuel savings and a reduction in the pollutants released with the exhaust gas.

Die Erfindung wird im folgenden anhand einer Zeichnung mit zwei Figuren erläutert. Es zeigen:

  • Fig. 1 im vergrößerten Schnitt ein Kraftstoffeinspritzventil, in dem ein Widerstand mit der Kennung dieses Kraftstoffeinspritzventils angeordnet ist, und
  • Fig. 2 ein Blockschaltbild der Einspritzelektronik, welche zu dieser Einrichtung gehört, mit einer Magnetspule und einem elektrischen Widerstand eines Kraftstoffeinspritzventils.
The invention is explained below with reference to a drawing with two figures. Show it:
  • Fig. 1 shows an enlarged section of a fuel injector in which a resistor with the identifier of this fuel injector is arranged, and
  • Fig. 2 is a block diagram of the injection electronics, which belongs to this device, with a solenoid and an electrical resistance of a fuel injector.

In der Praxis sind beim Einsatz des Verbrennungsmotors in Kraftfahrzeugen statt eines Kraftstoffeinspritzventils derer mehrere vorhanden, deren Widerstände nacheinander abgefragt werden können, um die jeweils zudosierten Mengen zu beeinflussen.In practice, when the internal combustion engine is used in motor vehicles, instead of one fuel injector, there are several, the resistances of which can be queried one after the other in order to influence the amounts added in each case.

In Fig. 1 ist mit 1 ein Ventilgehäuse bezeichnet, in dessen Bohrung 2 eine Magnetspule 3 untergebracht ist. Der Magnetspule steht ein Anker 4 gegenüber. Der Anker wird bei nicht erregter Magnetspule durch eine Schließfeder 5 von dieser weggedrückt und bei erregter Magnetspule zu dieser hingezogen.In Fig. 1, 1 denotes a valve housing, in the bore 2, a solenoid 3 is housed. An armature 4 faces the magnet coil. The armature is pushed away by a closing spring 5 when the magnet coil is not energized and is drawn toward the magnet coil when the magnet coil is energized.

Mit dem Anker ist eine Ventilnadel 6 verbunden. Die Ventilnadel wird unter der Wirkung der Schließfeder 5 gegen einen Ventilsitz 7 gedrückt und schließt in diesem Zustand das Kraftstoffeinspritzventil.A valve needle 6 is connected to the armature. The valve needle is pressed under the action of the closing spring 5 against a valve seat 7 and closes the fuel injection valve in this state.

Die Kraftstoffzufuhr erfolgt über einen Kraftstoffanschluß 8, eine Längsbohrung 9, verschiedene Freiräume einschließlich der Längsnuten 10 und 11 bis in eine Ringform 12 stromaufwärts des Ventilsitzes.The fuel is supplied via a fuel connection 8, a longitudinal bore 9, various free spaces including the longitudinal grooves 10 and 11 up to an annular shape 12 upstream of the valve seat.

Zur Erregung der Magnetspule 3 ist diese über eine in der Zeichnung nicht sichtbare Leitung mit zwei Steckerzungen verbunden, die in einem Isolierteil 13 untergebracht sind. In der Zeichnung ist die eine Steckerzunge 14 erkennbar, während zwei weitere Steckerzungen nicht dargestellt sind.To excite the magnetic coil 3, it is connected via a line (not visible in the drawing) to two plug tongues, which are accommodated in an insulating part 13. One connector tongue 14 can be seen in the drawing, while two further connector tongues are not shown.

In eine Ausnehmung 15 ist ein Widerstand 16 eingebettet, dessen Widerstandswert proportional der Kennung des Kraftstoffeinspritzventils, nämlich der Einspritzmenge zur Ansteuerzeit bemessen ist. Eine Zuleitung 17 des Widerstands ist ebenfalls an die Steckerzunge 14 angeschlossen, während ein zweiter Anschluß des Widerstands an eine der weiteren Steckerzungen in der Zeichnung nicht sichtbar ist.A resistor 16 is embedded in a recess 15, the resistance value of which is dimensioned proportionally to the identifier of the fuel injection valve, namely the injection quantity at the actuation time. A lead 17 of the resistor is also connected to the tongue 14, while a second connection of the resistor to one of the other tongues is not visible in the drawing.

In Fig. 2 ist die Einrichtung zur zeitgesteuerten Ansteuerung des Kraftstoffeinspritzventils nach Fig. 1 dargestellt. Die in Fig. 2 gezeigte Einspritzelektronik ist in der Regel ein Teil eines umfassenderen Einspritz",elektroniksystems, mit dem mehrere Kraftstoffeinspritzventile der in Fig. 1 dargestellten Art angesteuert werden können.FIG. 2 shows the device for time-controlled activation of the fuel injection valve according to FIG. 1. The injection electronics shown in FIG. 2 are generally part of a more extensive injection electronics system, with which a plurality of fuel injection valves of the type shown in FIG. 1 can be controlled.

Wesentlicher Bestandteil der Einspritzelektronik ist ein Monoflop 18, dessen Kippzeitdauer durch ein Spannungssignal an einem Eingang 19 proportional variiert werden kann. In der Motorelektronik wird das Spannungssignal von einem Luftmengensensor 20 erzeugt, der die von dem Verbrennungsmotor angesaugte Luftmenge erfaßt.An essential component of the injection electronics is a monoflop 18, the duration of which can be varied proportionally by a voltage signal at an input 19. In the engine electronics, the voltage signal is generated by an air quantity sensor 20, which detects the air quantity drawn in by the internal combustion engine.

An einem Ausgang 21 des Monoflops entsteht somit ein Puls, dessen Impulsdauer oder -länge von der mit dem Luftmengensensor 20 erfaßten Luftmenge abhängt. Der Puls wird mit einem Treiber 22 verstärkt und über eine Steckerzunge 23 der Magnet spule 3 zugeführt, so daß diese während der Dauer des Impulse erregt wird. Somit dosiert das Kraftstoffeinspritzventil, zu dem die Magnetspule 3 gehört, eine Kraftstoffmenge in das Ansaugsystem, die der Impulsdauer proportional ist. Die Menge hängt dabei von der Kennung des Kraftstoffeinspritzventils, d.h. die im konstruktions- und fertigungsbedingten Verhältnis Einspritzmenge zu Ansteuerzeit, ab.A pulse thus arises at an output 21 of the monoflop, the pulse duration or length of which depends on the amount of air detected by the air amount sensor 20. The pulse is amplified by a driver 22 and supplied to the magnetic coil 3 via a tongue 23, so that it is excited during the duration of the pulses. Thus, the fuel injection valve, to which the solenoid 3 belongs, doses an amount of fuel into the intake system that is proportional to the pulse duration. The amount depends on the identifier of the fuel injector, i.e. the ratio of injection quantity to actuation time, depending on the design and production.

Diese Kennung, bzw. Abweichungen der Kennung von einem Sollwert, kann aus einem Widerstand 16 ausgelesen werden, dessen Widerstandswert entsprechend der Kennung bzw. Abweichung von der Kennung eingestellt oder ausgewählt wurde. Dieser Widerstand mit der angegebenen Widerstandsgröße ist Bestandteil des Kraftstoffeinspritzventils nach Fig. l.This identifier, or deviations of the identifier from a target value, can be read from a resistor 16, the resistance value of which has been set or selected in accordance with the identifier or deviation from the identifier. This resistance with the specified resistance value is part of the fuel injection valve according to FIG. 1.

Der von dem Widerstand abgefragte Widerstandswert wird über einen Analog-Digital-Umsetzer 24 als Adresse in eine mit einem ROM 25 gespeicherte Tabelle eingespeist. In der Tabelle sind den Adressen Korrekturgrößen zugeordnet. Je eine dem Widerstandswert des Widerstands 16 entsprechende Korrekturgröße wird aus der Tabelle des ROM 25 ausgelesen und in einen zweiten Eingang 26 des Monoflop eingespeist. Der innere Aufbau des Monoflop gestattet es, daß die Impulsdauer oder -länge, die zunächst durch die Steuergröße entsprechend der Luftmenge bestimmt ist, nach Maßgabe der Korrekturgröße aus der Tabelle des ROM 25 korrigiert wird. Das Monoflop ergibt somit einen Puls einer so großen Impulsdauer ab, daß die von dem zugehörigen Kraftstoffeinspritzventil dosierte Kraftstoff menge genau gleich der Kraftstoffmenge ist, wenn das Kraftstoffeinspritzventil den Sollwert der Kennung, d.h. der Einspritzsollmenge, zur Ansteuerzeit aufweisen würde. - Dies bedeutet, daß die ohne Korrekturgröße von dem Monoflop 18 gebildete Impulsdauer in dem Maße verlängert oder verkürzt wird, wie es der Abweichung der Kennung des zugehörigen Kraftstoffeinspritzventils von dem Sollwert der Kennung entspricht.The resistance value queried by the resistor is fed via an analog-digital converter 24 as an address into a table stored with a ROM 25. Correction quantities are assigned to the addresses in the table. A correction value corresponding to the resistance value of the resistor 16 is read from the table of the ROM 25 and fed into a second input 26 of the monoflop. The internal structure of the monoflop allows the pulse duration or length, which is initially determined by the control variable in accordance with the amount of air, to be corrected in accordance with the correction variable from the table in ROM 25. The monoflop thus produces a pulse of such a long pulse duration that the amount of fuel metered by the associated fuel injector is exactly the same as the amount of fuel when the fuel injector reaches the setpoint of the identifier, ie the on injection target quantity, would have at the control time. This means that the pulse duration formed by the monoflop 18 without a correction quantity is lengthened or shortened to the extent that it corresponds to the deviation of the identifier of the associated fuel injector from the target value of the identifier.

Wie erwähnt,kann mit der Erweiterung der in Fig.2 dargestellten Einspritzelektronik auf die korrigierte Ansteuerung mehrerer Kraftstoffeinspritzventile ein sehr guter Gleichlauf sämtlicher Kraftstoffeinspritzventile einer Multipointeinspritzung erreicht werden. Der elektronische Teil der Einrichtung zur Erfassung des Widerstandswerts, der dem Kraftstoffeinspritzventil zugeordnet ist, erfordert nur einen geringen Aufwand, da regelmäßig in eine Einspritzelektronik Mikroprozessorsysteme eingesetzt werden, die freie Analogeingänge zum Anschluß der Widerstände aufweisen.As mentioned, with the expansion of the injection electronics shown in FIG. 2 to the correct actuation of a plurality of fuel injection valves, very good synchronization of all fuel injection valves of a multipoint injection can be achieved. The electronic part of the device for detecting the resistance value, which is assigned to the fuel injection valve, requires only little effort, since microprocessor systems which have free analog inputs for connecting the resistors are regularly used in an injection electronics system.

Claims (6)

1. Einrichtung zur zeitgesteuerten Ansteuerung elektromagnetisch betätigbarer Kraftstoffeinspritzventile von Brennkraftmaschinen mit einer Einspritzelektronik,
dadurch gekennzeichnet ,
daß an jedem Kraftstoffeinspritzventil (1-14) ein elektrisches Bauelement (Widerstand 16) angeordnet ist, das proportional einer Kenngröße (Einspritzmenge zu Ansteuerzeit) des Kraftstoffeinspritzventils dimensioniert ist und an die Einspritzelektronik (18, 22) zur Beeinflussung der Einspritzzeit anschließbar ist.1. Device for time-controlled activation of electromagnetically actuated fuel injection valves of internal combustion engines with injection electronics,
characterized ,
that on each fuel injection valve (1-14) an electrical component (resistor 16) is arranged, which is dimensionally proportional to a parameter (injection quantity to control time) of the fuel injection valve and can be connected to the injection electronics (18, 22) to influence the injection time. 2. Einrichtung nach Anspruch 1,
gekennzeichnet durch
einen Widerstand (16) als elektrisches Bauelement.2. Device according to claim 1,
marked by
a resistor (16) as an electrical component. 3. Einrichtung, deren Kraftstoffeinspritzventile ein Isolierteil mit in ihm untergebrachten Steckerzungen zum Anschluß einer Magnetspule an die Einspritzelektronik aufweist, nach Anspruch 1 oder 2,
dadurch gekennzeichnet ,
daß das Bauelement (Widerstand 16) in dem Isolierteil (13) angeordnet ist und mit zwei Steckerzungen (z.B. 14) verbunden ist.3. A device whose fuel injection valves have an insulating part with plug tongues accommodated therein for connecting a magnetic coil to the injection electronics, according to claim 1 or 2,
characterized ,
that the component (resistor 16) is arranged in the insulating part (13) and is connected to two plug tongues (for example 14). 4. Einrichtung nach Anspruch 3,
dadurch gekennzeichnet ,
daß eine der beiden Steckerzungen (14) mit denen das Bauelement (Widerstand 16) kontaktiert ist, zum Anschluß der Magnetspule (3) an die Motorelektronik (18, 22) vorgesehen ist.4. Device according to claim 3,
characterized ,
that one of the two plug tongues (14) with which the component (resistor 16) is contacted is provided for connecting the magnet coil (3) to the motor electronics (18, 22). 5. Einrichtung, die Mittel (Monoflop) zur Bildung von Stromimpulsen umfaßt, deren Länge von einer Steuergröße (Luftmenge) abhängt, nach einem der Ansprüche 1 - 4,
dadurch gekennzeichnet ,
daß jedes die Kenngröße des Kraftstoffventils beeinhaltendes Bauelement (Widerstand 16) über einen Analog-Digital-Umsetzer (24) und einen Tabellenspeicher (ROM 25) mit Mitteln (Monoflop 18) zur Beeinflussung der Stromimpulslänge in Verbindung steht.5. Device comprising means (monoflop) for forming current pulses, the length of which depends on a control variable (amount of air) according to one of claims 1-4,
characterized ,
that each component containing the characteristic of the fuel valve (resistor 16) is connected via an analog-digital converter (24) and a table memory (ROM 25) with means (monoflop 18) for influencing the current pulse length. 6. Elektromagnetisch betätigbares Kraftstoffeinspritzventil mit einem Isolierteil und in ihm untergebrachten Steckerzungen für Brennkraftmaschinen,
dadurch gekennzeichnet ,
daß in dem Isolierteil (1) des Kraftstoffeinspritzventils zusätzlich ein elektrischer Widerstand (16) angeordnet ist.6. Electromagnetically actuated fuel injection valve with an insulating part and plug tongues accommodated therein for internal combustion engines,
characterized ,
that in the insulating part (1) of the fuel injection valve, an electrical resistor (16) is additionally arranged.
EP86100974A 1985-03-21 1986-01-24 Control device for electromagnetically time-controlled injection valves Ceased EP0195194A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3510157 1985-03-21
DE19853510157 DE3510157A1 (en) 1985-03-21 1985-03-21 DEVICE FOR TIME-CONTROLLED CONTROL OF ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVES

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EP0195194A2 true EP0195194A2 (en) 1986-09-24
EP0195194A3 EP0195194A3 (en) 1988-02-17

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EP0492876A1 (en) * 1990-12-20 1992-07-01 Ford Motor Company Limited Fuel rail
WO1993003267A1 (en) * 1991-08-06 1993-02-18 Siemens Automotive L.P. Electronic calibrated fuel rail
EP1026384A1 (en) * 1999-02-01 2000-08-09 Denso Corporation Fuel injection system having a plurality of injectors
WO2000063545A1 (en) * 1999-04-16 2000-10-26 Siemens Automotive Corporation Identification of diesel engine injector characteristics
WO2001053900A2 (en) * 1999-11-01 2001-07-26 Siemens Automotive Corporation Utilizing increasing width for identification voltages
WO2002053896A3 (en) * 2001-01-04 2003-02-13 Siemens Vdo Automotive Corp Internal energizable voltage or current source for fuel injector identification

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JPH0349368U (en) * 1989-09-20 1991-05-14
US5502761A (en) * 1994-03-24 1996-03-26 Rolm Company Apparatus and method for relaying calling information to a pager or alternate telephone
JP3871375B2 (en) * 1996-06-19 2007-01-24 株式会社日本自動車部品総合研究所 Fuel injection device for internal combustion engine
DE10153522A1 (en) 2001-10-30 2003-05-22 Bosch Gmbh Robert Method and device for reading out data from a fuel metering system
DE10153520A1 (en) 2001-10-30 2003-05-22 Bosch Gmbh Robert Method and device for reading out data from a fuel metering system
DE10250921B4 (en) 2002-10-31 2007-10-04 Siemens Ag Circuit arrangement and method for the sequential classification of a plurality of controllable components

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492876A1 (en) * 1990-12-20 1992-07-01 Ford Motor Company Limited Fuel rail
WO1993003267A1 (en) * 1991-08-06 1993-02-18 Siemens Automotive L.P. Electronic calibrated fuel rail
EP1026384A1 (en) * 1999-02-01 2000-08-09 Denso Corporation Fuel injection system having a plurality of injectors
WO2000063545A1 (en) * 1999-04-16 2000-10-26 Siemens Automotive Corporation Identification of diesel engine injector characteristics
US6516658B1 (en) 1999-04-16 2003-02-11 Siemens Vdo Automotive Corporation Identification of diesel engine injector characteristics
WO2001053900A2 (en) * 1999-11-01 2001-07-26 Siemens Automotive Corporation Utilizing increasing width for identification voltages
WO2001053900A3 (en) * 1999-11-01 2002-11-14 Siemens Automotive Corp Lp Utilizing increasing width for identification voltages
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US6851305B2 (en) 1999-11-01 2005-02-08 Siemens Vdo Automotive Corporation Utilizing increasing width for identification voltages
WO2002053896A3 (en) * 2001-01-04 2003-02-13 Siemens Vdo Automotive Corp Internal energizable voltage or current source for fuel injector identification
US6651629B2 (en) 2001-01-04 2003-11-25 Mccoy John C. Internal energizable voltage or current source for fuel injector identification

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DE3510157A1 (en) 1986-09-25
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