EP1809884A1 - Device and method for correction of the injection behaviour of an injector - Google Patents

Device and method for correction of the injection behaviour of an injector

Info

Publication number
EP1809884A1
EP1809884A1 EP05807987A EP05807987A EP1809884A1 EP 1809884 A1 EP1809884 A1 EP 1809884A1 EP 05807987 A EP05807987 A EP 05807987A EP 05807987 A EP05807987 A EP 05807987A EP 1809884 A1 EP1809884 A1 EP 1809884A1
Authority
EP
European Patent Office
Prior art keywords
injector
information
determined
injection
correction
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
EP05807987A
Other languages
German (de)
French (fr)
Other versions
EP1809884B1 (en
Inventor
Ernst Kloppenburg
Frieder Necker
Le-Thanh-Son Tran
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1809884A1 publication Critical patent/EP1809884A1/en
Application granted granted Critical
Publication of EP1809884B1 publication Critical patent/EP1809884B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2422—Selective use of one or more tables
    • 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
    • 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
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems

Definitions

  • the invention relates to a device and a method for correcting the injection behavior of at least one injector with a device for storing information about the at least one injector and means for controlling the at least one injector taking into account the stored information, the information being obtained by comparing of desired values with actual values can be determined individually at a plurality of test points of the at least one injector and are referenced.
  • a generic device and a method for correcting the injection behavior of at least one injector, in which the information is correction quantities for a quantity correction field of the injector, are disclosed in DE 102 15 610 A1.
  • the control duration is corrected in a control device individually for each injector as a function of setpoint and rail pressure compared to a nominal characteristic map 210 (see FIG. so as to come as close as possible to a desired setpoint.
  • four test values from the production for example the injection quantity at four different test points, are stored in the control unit during installation per injector, for example. From these quantities, a cor- rectification quantity map 220 (see FIG.
  • this map is a quantity error map.
  • a corrected quantity requirement is then calculated for a desired injection quantity with the quantity error characteristic field given a rail pressure.
  • a drive time is then determined with the inverted nominal characteristic map 210 of the injector.
  • An example of such a quantity correction at one of the test points will be described with reference to FIG. 3, whereby in this case the assumption is made of error-free measurements.
  • an amount q P, lst which differs by ⁇ q from the nominal quantity qp jSO n , is measured for the activation duration t P.
  • Such devices and methods are used in particular for electrically operated injectors for injecting diesel fuel, for example in the context of so-called common rail systems.
  • common rail pressure generation and injection are decoupled.
  • the injection pressure is generated independently of the engine speed and the injection quantity and is ready for injection in the so-called “rail”.
  • the injection time and the injection quantity are calculated in the electronic engine control unit and converted by an injector on each engine cylinder via a remote-controlled valve.
  • the invention offers the advantage of making the injector-specific quantity equalization directly on the level of the activation duration.
  • the precision of the injected fuel quantities is substantially increased.
  • it is not necessary to assume a constant characteristic gradient in the vicinity of the test points, as is the case with the previously described method known from the prior art.
  • neither a coincidence of the slope of the nominal and the real characteristic nor of a known form of the course of injection must be assumed.
  • the transmission of the control duration correction determined for individual test points to the entire pressure setpoint characteristic map is easier than for a quantity error characteristic map. This considerably improves the accuracy of the individual quantity comparison and extends the applicability of the method to larger problem classes.
  • the means for controlling the injectors are preferably integrated in an engine control unit.
  • the injector-specific control with the associated correction is performed by the engine control unit.
  • the means for storing the information at the injector are for example a data memory attached to the injector, resistors arranged on the injector, barcodes arranged on the injector or, for example, a labeling field, also an alphanumeric encryption which is detected by a camera is possible.
  • a preferred embodiment provides, as a device for storing information, a semiconductor integrated circuit arranged on the injector.
  • a semiconductor integrated circuit can be integrated, for example, in the head of the injector.
  • the data used by the controller is preferably stored in the semiconductor integrated circuit in a nonvolatile memory.
  • the engine control unit also preferably has a semiconductor integrated circuit with which the information stored in integrated semiconductor circuits of the injectors is processed so as to achieve injector-specific control.
  • Figure 1 is a schematic representation of part of a be ⁇ known from the prior art common rail system.
  • FIG. 2 shows the correction over the quantity error according to a method known from the prior art
  • Fig. 3 shows schematically the effect of a slope deviation in the known from the prior art correction over the quantity error at a test point
  • FIG. 5 schematically shows the determination of a characteristic curve section and the corrected actuation duration according to the method according to the invention.
  • Fig. 1 the high pressure part of the known from the prior art Speicherein ⁇ injection system common rail is shown.
  • the arrangement comprises a high pressure pump 10, which communicates via a high pressure line 12 with the high pressure accumulator ("rail") 14 in connection.
  • the high pressure accumulator 14 is connected via further high pressure lines to the injectors.
  • a high-pressure line 16 and an injector 18 are shown.
  • the injector 18 is part of an engine of a motor vehicle.
  • the shown te system is controlled by an engine control unit 20. In particular, control of the injector 18 takes place by the engine control unit 20.
  • a device 22 for storing information which relates individually to the injector 18.
  • the information stored in the device 22 can be taken into account by the engine control unit 20, so that individual control of each injector 18 can take place.
  • the information can be correction values for the quantity profile of the injector 18, which are determined in the manner described above in connection with FIGS. 2 and 3.
  • the device 22 for storing the information can be implemented as a data memory, as one or more electrical resistors, as a barcode, by alphanumeric encryption or else by a semiconductor integrated circuit arranged on or in the injector 18.
  • the engine control unit 20 can also have a semiconductor integrated circuit for evaluating the information stored in the device 22.
  • a section of the characteristic curves "quantity over actuation period" is measured for several test points.
  • the procedure is as follows.
  • For the purpose of smoothing the stroke-to-stroke scattering at a test point a certain number, for example 50, of directly consecutive injections with different actuation durations are carried out in an area to be determined suitably (sweep). Since these quantities - as mentioned - are subject to a stroke-to-hub scattering, a smoothing regression curve is laid by the data points, which now represents a section of the injector for the given rail pressure, as shown schematically in Fig. 4.
  • the activation time correction can be used for the respective control point t p - t be determined corr which is required to achieve the target injection amount qp JSO n. In this way, apart from measurement errors, an exact quantity correction is possible in principle at the test point. Optionally, an extrapolation of the characteristic section can also take place in this step.
  • the number and selection of the test points to be measured in this way must be determined with regard to the required precision of the actuation duration correction and other boundary conditions. The range over which the actuation duration is changed in the measurements depends on the maximum expected actuation duration correction per test point.
  • the information about the actuation duration correction at various test points of the injector 18 is used in order to calculate a drive duration correction over the entire setpoint rail pressure range.
  • a drive duration correction ⁇ t is determined in the above-described manner in a circuit unit 420. The sum of the two values t nOm and ⁇ t results in the activation duration tkorr-

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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)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a device for correction of the injection behaviour of at least one injector, comprising a device for storage of information on the at least one injector and means for controlling the at least one injector, taking into account said stored information, whereby the information is determined and taken by individual comparison of actual values with set values at several measuring points for the at least one injector, characterised in that the information is control data for a control duration correction curve for the at least one injector.

Description

Vorrichtung und Verfahren zum Korrigieren des Einspriteverhaltens eines InjektorsApparatus and method for correcting the injection behavior of an injector
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Korrigieren des Ein¬ spritzverhaltens mindestens eines Injektors mit einer Einrichtung zum Speichern von Informationen über den mindestens einen Injektor und Mitteln zum Steuern des mindes¬ tens einen Injektors unter Berücksichtigung der gespeicherten Informationen, wobei die Informationen durch Vergleichen von Soll- Werten mit Ist-Werten individuell an mehre¬ ren Prüfpunkten des mindestens einen Injektors ermittelt werden und bezogen sind.The invention relates to a device and a method for correcting the injection behavior of at least one injector with a device for storing information about the at least one injector and means for controlling the at least one injector taking into account the stored information, the information being obtained by comparing of desired values with actual values can be determined individually at a plurality of test points of the at least one injector and are referenced.
Stand der TechnikState of the art
Eine gattungsgemäße Vorrichtung und ein Verfahren zum Korrigieren des Einspritzver¬ haltens mindestens eines Injektors, bei dem die Informationen Korrekturmengen für ein Mengenkorrekturfeld des Injektors sind, geht aus der DE 102 15 610 Al hervor. Bei die¬ sem bei der Anmelderin auch als IMA (individueller Mengen- Abgleich) bekannten Vor¬ richtung und Verfahren wird in einem Steuergerät individuell für jeden Injektor abhängig von Sollmenge und Raildruck die Ansteuerdauer gegenüber einem Nominalkennfeld 210 (vergl. Fig. 2) korrigiert, um so einer gewünschten Sollmenge möglichst nahe zu kom¬ men. Hierbei werden in dem Steuergerät beim Einbau pro Injektor beispielsweise vier Prüfwerte aus der Fertigung - beispielsweise die Einspritzmenge an vier verschiedenen Prüfpunkten - hinterlegt. Aus diesen Größen wird mit Interpolationsmethoden ein Kor- rekturmengenkennfeld 220 (siehe Fig. 2) in Abhängigkeit von der Sollmenge und vom Kraftstoffdruck aufgebaut. Im Grunde handelt es sich bei diesem Kennfeld um ein Men¬ genfehler-Kennfeld. In dem Steuergerät wird dann bei gegebenem Raildruck zu einer Soll-Einspritzmenge mit dem Mengenfehler-Kennfeld eine korrigierte Mengenanforde¬ rung berechnet. Aus dieser wiederum wird dann mit dem invertierten Nominal-Kennfeld 210 des Injektors eine Ansteuerdauer bestimmt. Ein Beispiel für eine derartige Mengen¬ korrektur an einem der Prüfpunkte wird anhand Fig. 3 beschrieben, wobei hierbei von fehlerfreien Messungen ausgegangen wird. Bei der Injektorprüfung wird für die Ansteu¬ erdauer tP eine Menge qP;lst gemessen, die um Δq von der Nominalmenge qpjSOn abweicht. Während des Betriebs des Injektors wird daher eine Mengenanforderung qP;SOu um Δq auf qmod reduziert, über die normale Kennlinie ergibt sich daraus eine Ansteuerdauer tkorr- Verlaufen die reale und die nominale Kennlinie parallel, erfolgt die Einspritzung der Menge QP,SOU durch den mit einer Ansteuerdauer tkorr angesteuerten Injektor. Verlaufen dagegen beide Kennlinien nicht parallel, ist die resultierende Einspritzmenge qkorr nicht gleich der Mengenanforderung, obwohl der Injektor an dem betreffenden Punkt geprüft wurde.A generic device and a method for correcting the injection behavior of at least one injector, in which the information is correction quantities for a quantity correction field of the injector, are disclosed in DE 102 15 610 A1. With this device and method known to the Applicant also as IMA (individual quantity adjustment), the control duration is corrected in a control device individually for each injector as a function of setpoint and rail pressure compared to a nominal characteristic map 210 (see FIG. so as to come as close as possible to a desired setpoint. In this case, four test values from the production, for example the injection quantity at four different test points, are stored in the control unit during installation per injector, for example. From these quantities, a cor- rectification quantity map 220 (see FIG. 2) as a function of the setpoint quantity and of the fuel pressure. Basically, this map is a quantity error map. In the control unit, a corrected quantity requirement is then calculated for a desired injection quantity with the quantity error characteristic field given a rail pressure. From this in turn, a drive time is then determined with the inverted nominal characteristic map 210 of the injector. An example of such a quantity correction at one of the test points will be described with reference to FIG. 3, whereby in this case the assumption is made of error-free measurements. In the injector test, an amount q P, lst , which differs by Δq from the nominal quantity qp jSO n , is measured for the activation duration t P. During operation of the injector, therefore, a quantity requirement q P, SO u is reduced by Δq to q mod , the normal characteristic curve results in a control duration t corr - if the real and the nominal characteristic run parallel, the injection of the quantity Q P takes place. SOU by the injector driven with a drive time t corr . If, on the other hand, both characteristic curves do not run parallel, the resulting injection quantity q corr is not equal to the quantity requirement, although the injector was tested at the relevant point.
Derartige Vorrichtungen und Verfahren kommen insbesondere bei elektrisch betriebenen Injektoren zur Einspritzung von Dieselkraftstoff, beispielsweise im Rahmen von soge¬ nannten Common-Rail-Systemen zum Einsatz. Bei der Speichereinspritzung "Common- Rail" sind Druckerzeugung und Einspritzung entkoppelt. Der Einspritzdruck wird unab¬ hängig von der Motordrehzahl und der Einspritzmenge erzeugt und steht im sogenannten "Rail" für die Einspritzung bereit. Der Einspritzzeitpunkt und die Einspritzmenge werden im elektronischen Motorsteuergerät berechnet und von einem Injektor an jedem Motorzy¬ linder über ein ferngesteuertes Ventil umgesetzt.Such devices and methods are used in particular for electrically operated injectors for injecting diesel fuel, for example in the context of so-called common rail systems. In accumulator injection "common rail", pressure generation and injection are decoupled. The injection pressure is generated independently of the engine speed and the injection quantity and is ready for injection in the so-called "rail". The injection time and the injection quantity are calculated in the electronic engine control unit and converted by an injector on each engine cylinder via a remote-controlled valve.
Bei dem vorbeschriebenen Verfahren ist nun problematisch, daß zunächst die Mengenan¬ forderung korrigiert wird und dann erst die Injektorkennlinie herangezogen wird. Dabei wird nämlich vorausgesetzt, daß die Steigung der Injektorkennlinie in der Umgebung des betrachteten Betriebspunktes konstant ist und mit der Steigung der nominalen Kennlinie übereinstimmt. Dies sind jedoch stark vereinfachende Annahmen, die in weiten Teilen des Arbeitsbereichs nicht zutreffen und damit die Genauigkeit des Verfahrens beeinträch¬ tigen. Vorteile der ErfindungIn the method described above is now problematic that first the Mengenan¬ request is corrected and then only the injector is used. In fact, it is assumed that the slope of the injector characteristic curve in the vicinity of the operating point under consideration is constant and coincides with the slope of the nominal characteristic curve. However, these are highly simplifying assumptions that do not apply in many parts of the work area and thus adversely affect the accuracy of the method. Advantages of the invention
Die Erfindung bietet demgegenüber den Vorteil, den injektorindividuellen Mengenab- gleich direkt auf der Ebene der Ansteuerdauer vorzunehmen. Hierdurch wird die Präzisi¬ on der eingespritzten Kraftstoffinengen wesentlich gesteigert. Es muß insbesondere nicht eine konstante Kennliniensteigung in der Nähe der Prüfpunkte angenommen werden, wie dies bei dem vorbeschriebenen, aus dem Stand der Technik bekannten Verfahren der Fall ist. Darüber hinaus muß weder von einer Übereinstimmung der Steigung der nominalen und der realen Kennlinie noch von einer bekannten Form des Einspritzverlaufs ausgegan¬ gen werden. Ein großer Vorteil ist auch, daß die Übertragung der für einzelne Prüfpunkte bestimmten Ansteuerdauerkorrektur auf das gesamte Druck-Sollmengen-Kennfeld leich¬ ter möglich ist als für ein Mengenfehler-Kennfeld. Hierdurch wird die Genauigkeit des individuellen Mengenabgleichs wesentlich verbessert und die Anwendbarkeit des Verfah¬ rens auf größere Problemklassen ausgedehnt.On the other hand, the invention offers the advantage of making the injector-specific quantity equalization directly on the level of the activation duration. As a result, the precision of the injected fuel quantities is substantially increased. In particular, it is not necessary to assume a constant characteristic gradient in the vicinity of the test points, as is the case with the previously described method known from the prior art. In addition, neither a coincidence of the slope of the nominal and the real characteristic nor of a known form of the course of injection must be assumed. It is also a great advantage that the transmission of the control duration correction determined for individual test points to the entire pressure setpoint characteristic map is easier than for a quantity error characteristic map. This considerably improves the accuracy of the individual quantity comparison and extends the applicability of the method to larger problem classes.
Bevorzugte Ausgestaltungen und Ausführungsformen des erfindungsgemäßen Verfahrens und der Vorrichtung sind Gegenstand der Unteransprüche.Preferred embodiments and embodiments of the method and the device according to the invention are the subject of the subclaims.
So sind die Mittel zum Steuern der Injektoren bevorzugt in einem Motorsteuergerät integ¬ riert. Auch die injektorspezifische Steuerung mit der einhergehenden Korrektur wird von dem Motorsteuergerät vorgenommen.Thus, the means for controlling the injectors are preferably integrated in an engine control unit. The injector-specific control with the associated correction is performed by the engine control unit.
Die Einrichtung zum Speichern der Informationen an dem Injektor sind beispielsweise ein an dem Injektor befestigter Datenspeicher, an dem Injektor angeordnete Widerstände, an dem Injektor angeordnete Barcodes oder beispielsweise ein Beschriftungsfeld, auch eine alphanumerische Verschlüsselung, die durch eine Kamera erfaßt wird, ist möglich.The means for storing the information at the injector are for example a data memory attached to the injector, resistors arranged on the injector, barcodes arranged on the injector or, for example, a labeling field, also an alphanumeric encryption which is detected by a camera is possible.
Eine bevorzugte Ausführungsform sieht als Einrichtung zum Speichern von Informatio¬ nen eine an dem Injektor angeordnete integrierte Halbleiterschaltung vor. Eine solche integrierte Halbleiterschaltung kann beispielsweise im Kopf des Injektors integriert sein. Die Daten, welche von dem Steuergerät verwendet werden, sind vorzugsweise in der integrierten Halbleiterschaltung in einem nichtflüchtigen Speicher abgelegt.A preferred embodiment provides, as a device for storing information, a semiconductor integrated circuit arranged on the injector. Such a semiconductor integrated circuit can be integrated, for example, in the head of the injector. The data used by the controller is preferably stored in the semiconductor integrated circuit in a nonvolatile memory.
Auch das Motorsteuergerät weist bevorzugt eine integrierte Halbleiterschaltung auf, mit der die in integrierten Halbleiterschaltungen der Injektoren gespeicherten Informationen verarbeitet werden, um so eine injektorspezifische Steuerung zu erzielen.The engine control unit also preferably has a semiconductor integrated circuit with which the information stored in integrated semiconductor circuits of the injectors is processed so as to achieve injector-specific control.
Zeichnungdrawing
Weitere Vorteile und Merkmale der Erfindung sind Gegenstand der nachfolgenden Be¬ schreibung und der zeichnerischen Darstellung von Ausführungsbeispielen. Es zeigen:Further advantages and features of the invention are the subject of the following Be¬ description and the drawings of exemplary embodiments. Show it:
Fig. 1 eine schematische Darstellung eines Teils eines aus dem Stand der Technik be¬ kannten Common-Rail-Systems;Figure 1 is a schematic representation of part of a be¬ known from the prior art common rail system.
Fig. 2 die Korrektur über dem Mengenfehler gemäß einem aus dem Stand der Technik bekannten Verfahren;FIG. 2 shows the correction over the quantity error according to a method known from the prior art; FIG.
Fig. 3 schematisch die Auswirkung einer Steigungsabweichung bei der aus dem Stand der Technik bekannten Korrektur über dem Mengenfehler an einem Prüfpunkt;Fig. 3 shows schematically the effect of a slope deviation in the known from the prior art correction over the quantity error at a test point;
Fig. 4 die erfϊndungsgemäße Mengenkorrektur mittels Änderung der Ansteuerdauer und4 shows the erfϊndungsgemäße quantity correction by changing the Ansteuerdauer and
Fig. 5 schematisch die Bestimmung eines Kennlinienabschnitts sowie der korrigierten Ansteuerdauer gemäß dem erfindungsgemäßen Verfahren.FIG. 5 schematically shows the determination of a characteristic curve section and the corrected actuation duration according to the method according to the invention.
Beschreibung der AusführungsbeispieleDescription of the embodiments
In Fig. 1 ist der Hochdruckteil des aus dem Stand der Technik bekannten Speicherein¬ spritzsystems Common-Rail dargestellt. Im folgenden werden nur die Hauptkomponenten und solche Komponenten näher erläutert, welche für das Verständnis der vorliegenden Erfindung wesentlich sind. Die Anordnung umfaßt eine Hochdruckpumpe 10, welche über eine Hochdruckleitung 12 mit dem Hochdruckspeicher ("Rail") 14 in Verbindung steht. Der Hochdruckspeicher 14 ist über weitere Hochdruckleitungen mit den Injektoren verbunden. In der vorliegenden Darstellung sind eine Hochdruckleitung 16 und ein Injek¬ tor 18 gezeigt. Der Injektor 18 ist Teil eines Motors eines Kraftfahrzeugs. Das dargestell- te System wird von einem Motor-Steuergerät 20 gesteuert. Durch das Motor-Steuergerät 20 erfolgt insbesondere eine Steuerung des Injektors 18.In Fig. 1, the high pressure part of the known from the prior art Speicherein¬ injection system common rail is shown. In the following, only the main components and those components which are essential for the understanding of the present invention will be explained in more detail. The arrangement comprises a high pressure pump 10, which communicates via a high pressure line 12 with the high pressure accumulator ("rail") 14 in connection. The high pressure accumulator 14 is connected via further high pressure lines to the injectors. In the present illustration, a high-pressure line 16 and an injector 18 are shown. The injector 18 is part of an engine of a motor vehicle. The shown te system is controlled by an engine control unit 20. In particular, control of the injector 18 takes place by the engine control unit 20.
An oder in dem Injektor 18 ist eine Einrichtung 22 zum Speichern von Informationen vorgesehen, welche sich individuell auf den Injektor 18 beziehen. Die Informationen, welche in der Einrichtung 22 gespeichert sind, können von dem Motor-Steuergerät 20 berücksichtigt werden, so daß eine individuelle Steuerung eines jeden Injektors 18 erfol¬ gen kann. Bei den Informationen kann es sich um Korrekturwerte für das Mengenkenn- feld des Injektors 18 handeln, die auf eingangs in Verbindung mit Fig. 2 und 3 beschrie¬ bene Weise ermittelt werden. Die Einrichtung 22 zum Speichern der Informationen kann als Datenspeicher, als ein oder mehrere elektrische Widerstände, als Barcode, durch al¬ phanumerische Verschlüsselung oder auch durch eine an oder in dem Injektor 18 ange¬ ordnete integrierte Halbleiterschaltung realisiert sein. Das Motorsteuergerät 20 kann e- benfalls eine integrierte Halbleiterschaltung zur Auswertung der in der Einrichtung 22 gespeicherten Informationen aufweisen.On or in the injector 18, a device 22 is provided for storing information which relates individually to the injector 18. The information stored in the device 22 can be taken into account by the engine control unit 20, so that individual control of each injector 18 can take place. The information can be correction values for the quantity profile of the injector 18, which are determined in the manner described above in connection with FIGS. 2 and 3. The device 22 for storing the information can be implemented as a data memory, as one or more electrical resistors, as a barcode, by alphanumeric encryption or else by a semiconductor integrated circuit arranged on or in the injector 18. The engine control unit 20 can also have a semiconductor integrated circuit for evaluating the information stored in the device 22.
Das erfϊndungsgemäße System und das erfϊndungsgemäße Verfahren werden nachfolgend in Verbindung mit Fig. 4 und Fig. 5 näher erläutert.The system according to the invention and the method according to the invention are explained in more detail below in conjunction with FIGS. 4 and 5.
Am fertig montierten Injektor 18 wird für mehrere Prüfpunkte jeweils ein Abschnitt der Kennlinien "Menge über Ansteuerdauer" vermessen. Um die Prüfzeit nicht oder nur ge¬ ringfügig zu verlängern, wird dabei wie folgt vorgegangen. Es werden zur Glättung der Hub-zu-Hub-Streuung an einem Prüfpunkt eine bestimmte Anzahl, beispielsweise 50, unmittelbar aufeinanderfolgende Einspritzungen mit unterschiedlichen Ansteuerdauern in einem geeignet zu bestimmenden Bereich durchgeführt (sweep). Da diese Mengenwerte - wie erwähnt - einer Hub-zu-Hub-Streuung unterliegen, wird durch die Datenpunkte eine glättende Regressionskurve gelegt, die nun einen Ausschnitt aus der Injektorkennlinie für den gegebenen Raildruck darstellt, wie es schematisch in Fig. 4 dargestellt ist. Durch diese Kennlinie kann für den jeweiligen Prüfpunkt die Ansteuerdauer-Korrektur tp - tkorr bestimmt werden, die zum Erzielen der Soll-Einspritzmenge qpjSOn erforderlich ist. Hier¬ durch ist - abgesehen von Meßfehlern - am Prüfpunkt rein prinzipiell eine exakte Men¬ genkorrektur möglich. Gegebenenfalls kann in diesem Schritt auch eine Extrapolation des Kennlinienabschnitts erfolgen. Die Anzahl und Auswahl der Prüfpunkte, die auf diese Weise vermessen werden, ist im Hinblick auf die erforderliche Genauigkeit der Ansteuerdauer-Korrektur und andere Randbedingungen zu bestimmen. Der Bereich, über den die Ansteuerdauer bei den Mes¬ sungen verändert wird, hängt von der maximal zu erwartenden Ansteuerdauer-Korrektur je Prüfpunkt ab.On the fully assembled injector 18, a section of the characteristic curves "quantity over actuation period" is measured for several test points. In order not to extend the test time or only slightly, the procedure is as follows. For the purpose of smoothing the stroke-to-stroke scattering at a test point, a certain number, for example 50, of directly consecutive injections with different actuation durations are carried out in an area to be determined suitably (sweep). Since these quantities - as mentioned - are subject to a stroke-to-hub scattering, a smoothing regression curve is laid by the data points, which now represents a section of the injector for the given rail pressure, as shown schematically in Fig. 4. By this characteristic, the activation time correction can be used for the respective control point t p - t be determined corr which is required to achieve the target injection amount qp JSO n. In this way, apart from measurement errors, an exact quantity correction is possible in principle at the test point. Optionally, an extrapolation of the characteristic section can also take place in this step. The number and selection of the test points to be measured in this way must be determined with regard to the required precision of the actuation duration correction and other boundary conditions. The range over which the actuation duration is changed in the measurements depends on the maximum expected actuation duration correction per test point.
Für jeden Injektor 18 muß die Information über die Meßergebnisse der Ansteuerdauer- Korrektur festgehalten werden, so daß sie beim Einbau in den Motor gegebenenfalls spä¬ ter während des Betriebs des Injektors 18 wieder zur Verfügung steht. Dies erfolgt mittels der Einrichtung 22 zum Speichern der Informationen.For each injector 18, the information on the measurement results of Ansteuerdauer- correction must be noted, so that it is later when installed in the engine later ter during operation of the injector 18 is available. This is done by the means 22 for storing the information.
Im Steuergerät 20 wird die Information über die Ansteuerdauer-Korrektur an verschiede¬ nen Prüfpunkten des Injektors 18 genutzt, um über den gesamten Sollmengen-Raildruck- Bereich eine Ansteuerdauer-Korrektur zu berechnen. Dies geschieht wie bei der Berech¬ nung des Mengenfehler-Kennfelds bei dem aus dem Stand der Technik, beispielsweise der DE 102 15 610 A1 bekannten und als IMA bezeichneten Verfahren. Im Steuergerät wird aus Sollmenge und Raildruck mittels eines Nominal-Kennfelds 410 (vergl. Fig. 5) die nominale Ansteuerdauer tnOm bestimmt. Parallel dazu wird eine Ansteuerdauer- Korrektur Δt auf die vorbeschriebene Weise in einer Schaltungseinheit 420 bestimmt. Aus der Summe der beiden Werte tnOm und Δt ergibt sich die zu verwendende Ansteuer¬ dauer tkorr- In the control unit 20, the information about the actuation duration correction at various test points of the injector 18 is used in order to calculate a drive duration correction over the entire setpoint rail pressure range. As in the case of the calculation of the quantity error characteristic field, this occurs in the case of the method known from the prior art, for example DE 102 15 610 A1 and designated as IMA. In the control unit, the nominal activation duration t nOm is determined from the target quantity and the rail pressure by means of a nominal characteristic diagram 410 (see FIG. In parallel, a drive duration correction Δt is determined in the above-described manner in a circuit unit 420. The sum of the two values t nOm and Δt results in the activation duration tkorr-

Claims

Patentansprüche claims
1. Vorrichtung zum Korrigieren des Einspritzverhaltens mindestens eines Injektors (18), mit einer Einrichtung (22) zum Speichern von Informationen des mindes¬ tens einen Injektors (18) und Mitteln zum Steuern des mindestens einen Injektors (18) unter Berücksichtigung der gespeicherten Informationen, wobei die Informa¬ tionen durch Vergleich von Soll- Werten mit Ist-Werten individuell an mehreren Prüfpunkten des mindestens einen Injektors (18) ermittelt wurden und bezogen sind, dadurch gekennzeichnet, daß die Informationen Ansteuerdauern für ein An- steuerdauerkorrekturkennfeld des mindestens einen Injektors (18) sind.1. Device for correcting the injection behavior of at least one injector (18), with a device (22) for storing information of at least one injector (18) and means for controlling the at least one injector (18) taking into account the stored information, wherein the information is determined and compared individually by comparison of desired values with actual values at a plurality of test points of the at least one injector (18), characterized in that the information is drive times for a control duration correction map of the at least one injector (18 ) are.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zum Steu¬ ern des mindestens einen Injektors (18) in einem Motor-Steuergerät (22) integ¬ riert sind.2. Apparatus according to claim 1, characterized in that the means for controlling the at least one injector (18) in an engine control unit (22) are integ¬ ration.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Einrich¬ tung (22) zum Speichern von Informationen ein an oder in dem Injektor (18) be¬ festigter Datenspeicher ist.3. Apparatus according to claim 1 or 2, characterized in that the Einrich¬ device (22) for storing information on or in the injector (18) be¬ festigter data memory.
4. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Einrichtung (22) zum Speichern von Informationen durch einen an dem Injek¬ tor (18) angeordneten Barcode oder eine Daten-Matrix oder durch an den Injektor (18) angeordnete Widerstände realisiert ist.4. Device according to one of claims 1 or 2, characterized in that the means (22) for storing information by a gate on the Injek¬ (18) arranged bar code or a data matrix or through to the injector (18) arranged Resistors is realized.
5. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Einrichtung (22) zum Speichern von Informationen durch eine alphanumeri¬ sche Verschlüsselung oder durch Klartext auf einem Beschriftungsfeld des Injek¬ tors (18) realisiert ist. 5. Device according to one of claims 1 or 2, characterized in that the means (22) for storing information by alphanumeri¬ cal encryption or by plain text on a labeling field of the Injek¬ sector (18) is realized.
6. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Einrichtung (22) zum Speichern von Informationen eine an oder in dem Injek¬ tor (18) angeordnete integrierte Halbleiterschaltung ist.6. Device according to one of claims 1 or 2, characterized in that the means (22) for storing information is a on or in the Injek¬ gate (18) arranged semiconductor integrated circuit.
7. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß durch das Vergleichen von Soll- Werten mit Ist-Werten die zu speichernden Informationen ermittelt werden, daß von dem Motorsteuergerät (20) aus den ge¬ speicherten Informationen das individuelle Ansteuerdauerkorrekturkennfeld für den mindestens einen Injektor (18) berechnet wird und daß die Einspritzmenge und/oder der Einspritzpunkt entsprechend den Ansteuerdauerkennfeldern korri¬ giert werden.7. Device according to one of the preceding claims, characterized in that the information to be stored is determined by comparing setpoint values with actual values that the individual control duration correction map for the at least one of the stored information from the engine control unit (20) an injector (18) is calculated and that the injection quantity and / or the injection point are corrected in accordance with the drive duration characteristic maps.
8. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Motorsteuergerät (20) eine integrierte Halbleiterschaltung aufweist.8. Device according to one of the preceding claims, characterized in that the motor control device (20) has a semiconductor integrated circuit.
9. Verfahren zum Korrigieren des Einspritzverhaltens wenigstens eines Injektors (18) mit den Verfahrensschritten:9. A method for correcting the injection behavior of at least one injector (18) with the method steps:
Steuern des mindestens einen Injektors (18) unter Berücksichtigung gespei¬ cherter Informationen, wobei die Informationen durch Vergleichen von Soll- Werten mit Ist-Werten an individuell mehreren Prüfpunkten des mindestens einen Injektors (18) ermittelt wurden und bezogen sind, dadurch gekennzeichnet, daß als Informationen Ansteuerdauern für die Bestim¬ mung eines Ansteuerdauerkennfeldes verwendet werden.Controlling the at least one injector (18) taking into account stored information, wherein the information was determined and obtained by comparing desired values with actual values at individually several test points of the at least one injector (18), characterized in that Information Ansteuerdauern be used for the determination of a Ansteuerdauerkennfeldes.
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß an jedem Prüfpunkt des wenigstens einen Injektors (18) ein Abschnitt einer Einspritzmenge- Ansteuerdauer-Kennlinie durch eine Mehrzahl von Messungen mit variierender Ansteuerdauer bestimmt wird und eine Ansteuerdauer-Korrektur durch Verglei¬ chen des Soll- Wertes mit dem Ist-Wert der eingespritzten Menge aus dieser Kennlinie ermittelt wird. 10. The method according to claim 9, characterized in that at each test point of the at least one injector (18) a portion of a Einspritzmengen- Ansteuerdauer characteristic is determined by a plurality of measurements with varying drive duration and a control period correction by Verglei¬ Chen the target - value is determined with the actual value of the injected quantity from this characteristic curve.
EP05807987A 2004-11-04 2005-10-14 Device and method for correction of the injection behaviour of an injector Expired - Fee Related EP1809884B1 (en)

Applications Claiming Priority (2)

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DE102004053266A DE102004053266A1 (en) 2004-11-04 2004-11-04 Apparatus and method for correcting the injection behavior of an injector
PCT/EP2005/055276 WO2006048372A1 (en) 2004-11-04 2005-10-14 Device and method for correction of the injection behaviour of an injector

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EP (1) EP1809884B1 (en)
JP (1) JP2008519201A (en)
KR (1) KR101033062B1 (en)
CN (1) CN101052797B (en)
BR (1) BRPI0510537A (en)
DE (1) DE102004053266A1 (en)
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EP1809884B1 (en) 2012-12-19
WO2006048372A1 (en) 2006-05-11
ES2397076T3 (en) 2013-03-04
KR101033062B1 (en) 2011-05-06
US20080077306A1 (en) 2008-03-27
US7628146B2 (en) 2009-12-08
CN101052797A (en) 2007-10-10
KR20070074598A (en) 2007-07-12
DE102004053266A1 (en) 2006-05-11
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JP2008519201A (en) 2008-06-05
BRPI0510537A (en) 2007-10-30

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