WO2013189682A1 - Method for operating a common rail injection system - Google Patents

Method for operating a common rail injection system Download PDF

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Publication number
WO2013189682A1
WO2013189682A1 PCT/EP2013/060499 EP2013060499W WO2013189682A1 WO 2013189682 A1 WO2013189682 A1 WO 2013189682A1 EP 2013060499 W EP2013060499 W EP 2013060499W WO 2013189682 A1 WO2013189682 A1 WO 2013189682A1
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WO
WIPO (PCT)
Prior art keywords
injection
common rail
control
injection system
preceded
Prior art date
Application number
PCT/EP2013/060499
Other languages
German (de)
French (fr)
Inventor
Ruben KAPP
Andreas Rupp
Maik Schaufler
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
Priority to KR1020157001314A priority Critical patent/KR102004579B1/en
Priority to CN201380032321.3A priority patent/CN104364505B/en
Priority to IN7784DEN2014 priority patent/IN2014DN07784A/en
Publication of WO2013189682A1 publication Critical patent/WO2013189682A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—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
    • F02D41/247—Behaviour for small quantities
    • 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
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • F02D41/3872—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves characterised by leakage flow in 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
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/403—Multiple injections with pilot injections
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • F02D2250/04—Fuel pressure pulsation in common rails
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method for operating a common rail injection system.
  • the present invention relates to a computer program that performs all the steps of the inventive method when it runs on a computing device or controller.
  • the present invention relates to a computer program product with program code, which is stored on a machine-readable carrier, for carrying out the method according to the invention when the program is executed on a computer or control unit.
  • a quantity deviation which results over the lifetime of a common rail injector through different forms of wear, must be compensated.
  • This difference in quantity can be positive (excess quantity) as well as negative (quantity shortage).
  • the problem now arises of determining and compensating for the difference between the setpoint quantity and the actually injected quantity.
  • the target amount corresponds to data stored in the control unit of the vehicle data characteristics.
  • the actual amount injected can only be determined indirectly.
  • there are different solutions for this Among other things, there is the possibility to measure the pressure curve in a cylinder of the engine via pressure measuring sensors and from there to the injection quantity advocateszunite. A disadvantage of this method is that additional measuring sensors must be installed for their application, which lead to additional costs.
  • DE 10 2008 043 165 A1 describes a method for determining the pre-injection quantity in the fired operation of an internal combustion engine.
  • a single injection that is, only a main injection and a double injection, that is, a pilot injection and a main injection
  • the activation duration of the pilot injection is changed until the effect on certain frequencies of a speed signal of the motor becomes zero.
  • the effect is determined by the magnitude and phase of a speed information transformed into the frequency domain. It takes into account half the camshafts and three halves of the camshaft frequency.
  • this method is associated with a serious disadvantage. This is that in the known method of
  • Pressure wave influence of the pilot injection on the main injection must be compensated if it is present in a pilot injection. This compensation is a high application cost and is subject to high tolerances, since not all operating points and boundary conditions are taken into account in the calculation.
  • each fuel in the method according to the invention for operating a common rail injection system of an internal combustion engine, each fuel
  • Main injection at least one pilot injection drive ahead, and at least one Voreinspritzungsan horrung takes place over such a short period of time that it does not lead to an opening and closing of an injector of the common rail injection system.
  • Injection system is removed, and thereby a pressure wave is triggered.
  • the influence of the pressure wave on the main injection is essentially independent of the activation duration of the pre-injection.
  • the at least one pilot injection control which takes place over such a short period of time that it does not lead to opening and closing of an injector valve of the common rail injection system, takes place for at least such a long period of time that it is open and closing a control valve of an injector of the common rail injection system leads. This allows the emptying and refilling of the control space of the injector.
  • every second main fuel injection is preceded by a pilot injection, which takes place for such a short period of time that it does not lead to opening and closing of an injector valve of the common rail injection system.
  • a pilot injection which takes place for such a short period of time that it does not lead to opening and closing of an injector valve of the common rail injection system.
  • each main fuel injection precedes exactly one pilot injection drive.
  • each main fuel injection precedes a plurality of pre-injection actuations, wherein at least one pre-injection actuation, which precedes another pre-injection actuation, takes place over such a short period of time that it does not lead to opening and closing of an injector valve of the common-rail system. Injection system leads. It is particularly preferred that each main fuel injection precedes two pre-injection drives. In this way, the method according to the invention can replace an injection pattern known from the prior art, which alternately consists of a double injection, that is, a main injection with a pilot injection, and a triple injection, that is, a main injection with two pilot injections, and that to one especially low noise emission of the internal combustion engine leads.
  • An injection pattern comprising the main injections and the pilot injections is preferably determined during a calibration, in particular a zero-quantity calibration.
  • the computer program according to the invention performs all the steps of the method according to the invention when it runs on a computing device or control unit. This allows the implementation of the method according to the invention in an existing common-rail injection system, without having to make structural changes.
  • the computer program product according to the invention with program code is stored on a machine-readable carrier and serves to carry out the method according to the invention when the program is executed on a computer or control unit.
  • Figure 1 shows a common rail injection system according to the prior art.
  • FIG. 2 shows an injector of the common-rail injection system according to FIG. 1.
  • FIG. 3 shows the sequence of a known injection pattern in which a single injection and a double injection are alternately deposited on a cylinder.
  • FIG. 4 shows schematically an embodiment of a method according to the invention.
  • FIG. 5 schematically shows the sequence of a method according to another embodiment of the invention.
  • Embodiments of the invention can be used for operating a known common rail injection system, as shown in FIG.
  • This includes a fuel tank 1 1, in which a fuel line with a fuel filter 1 1 1 ends, which leads to a fuel pump 1 12.
  • the fuel pump 1 12 conveys fuel through a filter 12 to a high pressure piston pump 13.
  • This transports fuel through a high pressure feed line 14 to a rail 15.
  • the rail 15 four stubs 16, each ending in an injector 17.
  • Each injector 17 is connected to a fuel return line 18 which terminates in the fuel tank 11.
  • the control of the high-pressure pump 13 and the injectors 17 is effected by a control unit 19.
  • an injector 17 The construction of an injector 17 is shown schematically in FIG.
  • the injector has a control valve 171, which is arranged in a valve chamber 172.
  • a piezoelectric actuator (not shown) is deformed by application of electrical voltage and there is a certain stroke, which is increased by a hydraulic coupler and passed to the control valve 171.
  • the valve space 172 is connected via an outlet 173 to a control volume 174, which is connected via an inlet 175 to a valve chamber 176 of an injector valve, which has a valve needle 177 and the fuel injection in a cylinder of the internal combustion engine is used.
  • a bypass 178 connects the two valve chambers 172, 176.
  • the control valve 172 can close the bypass 178, so that the pressure in the control volume 174 falls.
  • the nozzle needle 177 is then pressed inwards via the pressure in the rail 15 and the hole nozzle of the valve chamber 176 is no longer closed by the nozzle needle 177. It comes to an injection. If the electrical voltage is now taken back from the activator, the bypass 178 is opened again via the control valve 172. In the control volume 174 pressure builds up and the nozzle needle 177 is pushed down. The nozzle is closed again via the nozzle needle 177 and the injection was stopped.
  • Main injection 21 1 and a double injection, which consists of a Pre-injection 221 and a main injection 212 is.
  • the main injection 212 is extended by an amount 212a. This is shown in FIG.
  • FIG. 4 shows an embodiment of the method according to the invention for operating a common-rail injection system 1.
  • a conventional pilot injection 321 followed by a main injection 31 1 and a pilot injection 331 for such a short period of time that it does not open and close the injector valve 176, 177 but is long enough to open and Close the control valve 171 of the injector 17 to lead.
  • a main injection 312. In this embodiment of the method according to the invention, the pressure influence of the two pilot injections 321, 331 on the two main injections 31 1, 312 is equal, so that no compensation of the pressure wave influence has to take place.
  • FIG. 5 shows the sequence of another embodiment of the method according to the invention.
  • a first main injection 333 is preceded by two conventional pilot injections 322, 323, and a second main injection 334 is preceded by a conventional pilot injection 324, which is preceded by a pilot injection 332 that occurs for such a short period of time not to open and close the injector valve 176 , 177, but sufficient to trigger opening and closing of the control valve 171 of the injector 17.
  • the pressure wave influence on the two main injections 333, 334 is identical, so that no compensation of the pressure wave influence is necessary.
  • each with two pilot injections leads to a very low noise level of the internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a method for operating a common rail injection system of an internal combustion engine. According to the invention, each main fuel injection (311, 312) is preceded by at least one pilot injection activation (321, 331) and at least one pilot injection activation (331) is carried out over such a short period of time that it does not result in an injection valve of the common rail injection system opening and closing.

Description

Beschreibung  description
Titel title
Verfahren zum Betreiben eines Common-Rail-Einspritzsvstems Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben eines Common- Method for operating a common rail injection system The present invention relates to a method for operating a common rail injection system.
Rail-Einspritzsystems einer Verbrennungskraftmaschine. Weiterhin betrifft die vorliegende Erfindung ein Computerprogramm, das alle Schritte des erfindungsgemäßen Verfahrens ausführt, wenn es auf einem Rechengerät oder Steuergerät abläuft. Schließlich betrifft die vorliegende Erfindung ein Computerprogrammpro- dukt mit Programmcode, der auf einem maschinenlesbaren Träger gespeichert ist, zur Durchführung des erfindungsgemäßen Verfahrens, wenn das Programm auf einem Rechengerät oder Steuergerät ausgeführt wird. Rail injection system of an internal combustion engine. Furthermore, the present invention relates to a computer program that performs all the steps of the inventive method when it runs on a computing device or controller. Finally, the present invention relates to a computer program product with program code, which is stored on a machine-readable carrier, for carrying out the method according to the invention when the program is executed on a computer or control unit.
Stand der Technik State of the art
Kraftstoff-Voreinspritzungen in einem Common-Rail-Einspritzsystem spielen bei der Reduzierung der Geräusch- und Abgasemission von Dieselmotoren eine bedeutende Rolle. Um die Einhaltung der gesetzlich geforderten Abgaswerte gewährleisten zu können ist es notwendig, dass die tatsächlichen Einspritzmengen mit von einem Steuergerät berechneten Sollmengen übereinstimmen. Dazu muss eine Mengenabweichung, welche sich über die Lebenszeit eines Common- Rail-Injektors durch verschiedene Verschleißformen ergibt, ausgeglichen werden. Dieser Mengenunterschied kann positiv (Mengenüberschuss) als auch negativ (Mengenmangel) sein. Es ergibt sich nun das Problem, den Unterschied zwi- sehen Sollmenge und tatsächlich eingespritzter Menge festzustellen und auszugleichen. Die Sollmenge entspricht dabei im Steuergerät des Fahrzeuges abgespeicherten Datenkennlinien. Die tatsächlich eingespritzte Menge kann dagegen nur indirekt bestimmt werden. Hierfür gibt es verschiedene Lösungsansätze. So gibt es unter anderem die Möglichkeit über Druckmesssensoren den Druckver- lauf in einem Zylinder des Motors zu messen um daraus auf die Einspritzmenge zurückzuschließen. Ein Nachteil dieser Methode ist, dass zu ihrer Anwendung zusätzliche Messsensoren verbaut werden müssen, die zu Mehrkosten führen. Fuel pilot injections in a common rail injection system play a significant role in reducing the noise and exhaust emissions of diesel engines. In order to be able to ensure compliance with the legally required exhaust gas values, it is necessary that the actual injection quantities coincide with the nominal quantities calculated by a control unit. For this purpose, a quantity deviation, which results over the lifetime of a common rail injector through different forms of wear, must be compensated. This difference in quantity can be positive (excess quantity) as well as negative (quantity shortage). The problem now arises of determining and compensating for the difference between the setpoint quantity and the actually injected quantity. The target amount corresponds to data stored in the control unit of the vehicle data characteristics. By contrast, the actual amount injected can only be determined indirectly. There are different solutions for this. Among other things, there is the possibility to measure the pressure curve in a cylinder of the engine via pressure measuring sensors and from there to the injection quantity zurückzuschließen. A disadvantage of this method is that additional measuring sensors must be installed for their application, which lead to additional costs.
Die DE 10 2008 043 165 A1 beschreibt beispielsweise ein Verfahren zur Be- Stimmung der Voreinspritzungsmenge im gefeuerten Betrieb einer Verbrennungskraftmaschine. Bei einem solchen Verfahren wird auf einem Zylinder abwechselnd eine Einfacheinspritzung, das heißt nur eine Haupteinspritzung, und eine Zweifacheinspritzung, das heißt eine Voreinspritzung und eine Haupteinspritzung, abgesetzt. Die Ansteuerdauer der Voreinspritzung wird bei einem sol- chen Verfahren so lange verändert, bis die Wirkung auf bestimmte Frequenzen eines Drehzahlsignals des Motors Null wird. Die Wirkung wird durch Betrag und Phase einer in den Frequenzbereich transformierten Drehzahlinformation ermittelt. Berücksichtigt werden dabei die halben Nockenwellen und drei Halbe der Nockenwellenfrequenz. Dieses Verfahren ist allerdings mit einem gravierenden Nachteil verbunden. Dieser besteht darin, dass beim bekannten Verfahren derFor example, DE 10 2008 043 165 A1 describes a method for determining the pre-injection quantity in the fired operation of an internal combustion engine. In such a method, a single injection, that is, only a main injection and a double injection, that is, a pilot injection and a main injection, are alternately set down on a cylinder. In such a method, the activation duration of the pilot injection is changed until the effect on certain frequencies of a speed signal of the motor becomes zero. The effect is determined by the magnitude and phase of a speed information transformed into the frequency domain. It takes into account half the camshafts and three halves of the camshaft frequency. However, this method is associated with a serious disadvantage. This is that in the known method of
Druckwelleneinfluss der Voreinspritzung auf die Haupteinspritzung kompensiert werden muss, wenn er in einer Voreinspritzung vorhanden ist. Diese Kompensation stellt einen hohen Applikationsaufwand da und ist mit hohen Toleranzen behaftet, da nicht alle Betriebspunkte und Randbedingungen in der Bedatung be- rücksichtigt sind. Pressure wave influence of the pilot injection on the main injection must be compensated if it is present in a pilot injection. This compensation is a high application cost and is subject to high tolerances, since not all operating points and boundary conditions are taken into account in the calculation.
Offenbarung der Erfindung Disclosure of the invention
Im erfindungsgemäßen Verfahren zum Betreiben eines Common-Rail- Einspritzsystems einer Verbrennungskraftmaschine geht jeder Kraftstoff-In the method according to the invention for operating a common rail injection system of an internal combustion engine, each fuel
Haupteinspritzung mindestens eine Voreinspritzungsansteuerung voran, und mindestens eine Voreinspritzungsansteuerung erfolgt über einen so kurzen Zeitraum, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils des Common-Rail-Einspritzsystems führt. Durch Variation der Voreinspritzungsmen- ge bei gleichzeitiger Beobachtung des Druckwelleneinflusses lässt sich feststellen, dass bereits bei kleinen Voreinspntzungsansteuerdauern, die noch gar nicht zur Einspritzung einer Kraftstoff menge führen, ein Druckwelleneinfluss auf die Haupteinspritzung zu beobachten ist. Dies liegt daran, dass durch Leeren und Wiederbefüllen des Steuerraums eines Injektors eines Common-Rail- Einspritzsystems bereits eine Menge aus dem Rail des Common-Rail-Main injection at least one pilot injection drive ahead, and at least one Voreinspritzungsansteuerung takes place over such a short period of time that it does not lead to an opening and closing of an injector of the common rail injection system. By varying the pre-injection quantity while observing the influence of the pressure wave, it can be established that a pressure wave influence on the main injection can already be observed even at small pre-activation drive durations which do not even lead to the injection of a fuel quantity. This is due to the fact that emptying and refilling the control chamber of an injector of a common-rail injection system already generates a large amount from the rail of the common-rail injection system.
Einspritzsystems entnommen wird, und dadurch eine Druckwelle ausgelöst wird. Der Einfluss der Druckwelle auf die Haupteinspritzung ist im Wesentlichen unabhängig von der Ansteuerdauer der Voreinspritzung. Es ist allerdings erfindungsgemäß bevorzugt, dass die mindestens eine Voreinspritzungsansteuerung, die über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils des Common-Rail-Einspritzsystems führt, mindestens über einen so langen Zeitraum erfolgt, dass sie zum Öffnen und Schließen eines Steuerventils eines Injektors des Common-Rail-Einspritzsystems führt. Dies ermöglicht das Leeren und Wiederbefüllen des Steuerraums des Injektors. Um mit dem erfindungsgemäßen Verfahren ein herkömmliches Einspritzmuster zu ersetzen ist es bevorzugt, dass jeder zweiten Kraftstoffhaupteinspritzung eine Voreinspritzungsansteuerung vorangeht, die über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils des Common-Rail-Einspritzsystems führt. Um ein herkömmliches Einspritzmuster zu ersetzen, in dem abwechselnd eine Einfacheinspritzung und eine Zweifacheinspritzung abgesetzt wird, wie es beispielsweise in der DE 10 2008 043 165 A1 beschrieben wird, ist es erfindungsgemäß bevorzugt, dass jeder Kraftstoff- Haupteinspritzung genau eine Voreinspritzungsansteuerung vorangeht. Es ist allerdings auch möglich, dass jeder Kraftstoff-Haupteinspritzung mehrere Vorein- spritzungsansteuerungen vorangehen, wobei mindestens eine Voreinspritzungsansteuerung, welche einer anderen Voreinspritzungsansteuerung vorangeht, über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils des Common-Rail-Einspritzsystems führt. Dabei ist besonders bevorzugt, dass jeder Kraftstoff-Haupteinspritzung zwei Vorein- spritzungsansteuerungen vorangehen. Auf diese Weise kann das erfindungsgemäße Verfahren ein aus dem Stand der Technik bekanntes Einspritzmuster ersetzen, welches abwechselnd aus einer Zweifacheinspritzung, das heißt einer Haupteinspritzung mit einer Voreinspritzung, und einer Dreifacheinspritzung, das heißt einer Haupteinspritzung mit zwei Voreinspritzungen besteht, und das zu ei- ner besonders geringen Geräuschentwicklung der Verbrennungskraftmaschine führt. Injection system is removed, and thereby a pressure wave is triggered. The influence of the pressure wave on the main injection is essentially independent of the activation duration of the pre-injection. However, it is preferred according to the invention that the at least one pilot injection control, which takes place over such a short period of time that it does not lead to opening and closing of an injector valve of the common rail injection system, takes place for at least such a long period of time that it is open and closing a control valve of an injector of the common rail injection system leads. This allows the emptying and refilling of the control space of the injector. In order to replace a conventional injection pattern with the method according to the invention, it is preferable for every second main fuel injection to be preceded by a pilot injection, which takes place for such a short period of time that it does not lead to opening and closing of an injector valve of the common rail injection system. In order to replace a conventional injection pattern in which a single injection and a dual injection are alternately discontinued, as described for example in DE 10 2008 043 165 A1, it is preferred according to the invention that each main fuel injection precedes exactly one pilot injection drive. However, it is also possible that each main fuel injection precedes a plurality of pre-injection actuations, wherein at least one pre-injection actuation, which precedes another pre-injection actuation, takes place over such a short period of time that it does not lead to opening and closing of an injector valve of the common-rail system. Injection system leads. It is particularly preferred that each main fuel injection precedes two pre-injection drives. In this way, the method according to the invention can replace an injection pattern known from the prior art, which alternately consists of a double injection, that is, a main injection with a pilot injection, and a triple injection, that is, a main injection with two pilot injections, and that to one especially low noise emission of the internal combustion engine leads.
Ein Einspritzmuster, das die Haupteinspritzungen und die Voreinspritzungsan- steuerungen umfasst, wird bevorzugt während einer Kalibrierung, insbesondere einer Nulmengenkalibrierung, ermittelt. Durch Anwendung des erfindungsgemäßen Verfahrens kann die Bedatung einer Druckwellenkompensation entfallen. Dadurch wird der Applikationsaufwand des Verfahrens erheblich verringert. Weiterhin ist die Genauigkeit der Einlernung des erfindungsgemäßen Verfahrens ge genüber einem herkömmlichen Verfahren zum Betreiben eines Common-Rail- Einspritzsystems erhöht, da sich Toleranzen in der Applikation von Druckwellen nicht mehr auf den Lernwert auswirken. An injection pattern comprising the main injections and the pilot injections is preferably determined during a calibration, in particular a zero-quantity calibration. By applying the method according to the invention, the definition of a pressure wave compensation can be dispensed with. As a result, the application cost of the process is significantly reduced. Furthermore, the accuracy of learning the method according to the invention compared to a conventional method for operating a common rail injection system is increased because tolerances in the application of pressure waves no longer affect the learning value.
Das erfindungsgemäße Computerprogramm führt alle Schritte des erfindungsgemäßen Verfahrens aus, wenn es auf einem Rechengerät oder Steuergerät ab läuft. Dies ermöglicht die Implementierung des erfindungsgemäßen Verfahrens in einem vorhandenen Common-Rail-Einspritzsystem, ohne daran bauliche Veränderungen vornehmen zu müssen. Hierzu ist das erfindungsgemäße Computerprogrammprodukt mit Programmcode auf einem maschinenlesbaren Träger gespeichert und dient zur Durchführung des erfindungsgemäßen Verfahrens wenn das Programm auf einem Computer oder Steuergerät ausgeführt wird. The computer program according to the invention performs all the steps of the method according to the invention when it runs on a computing device or control unit. This allows the implementation of the method according to the invention in an existing common-rail injection system, without having to make structural changes. For this purpose, the computer program product according to the invention with program code is stored on a machine-readable carrier and serves to carry out the method according to the invention when the program is executed on a computer or control unit.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Ausführungsbeispiele der Erfindungen sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert. Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.
Figur 1 zeigt ein Common-Rail-Einspritzsystem gemäß dem Stand der Technik. Figure 1 shows a common rail injection system according to the prior art.
Figur 2 zeigt einen Injektor des Common-Rail-Einspritzsystems gemäß Figur 1. FIG. 2 shows an injector of the common-rail injection system according to FIG. 1.
Figur 3 stellt den Ablauf eines bekannten Einspritzmusters dar, in dem auf einem Zylinder abwechselnd eine Einfacheinspritzung und eine Zweifacheinspritzung abgesetzt werden. FIG. 3 shows the sequence of a known injection pattern in which a single injection and a double injection are alternately deposited on a cylinder.
Figur 4 zeigt schematisch eine Ausführungsform eines Verfahrens gemäß der Erfindung. FIG. 4 shows schematically an embodiment of a method according to the invention.
Figur 5 zeigt schematisch den Ablauf eines Verfahrens gemäß einer anderen Ausführungsform der Erfindung. FIG. 5 schematically shows the sequence of a method according to another embodiment of the invention.
Ausführungsformen der Erfindung Das erfindungsgemäße Verfahren kann zum Betreiben eines bekannten Com- mon-Rail-Einspritzsystems verwendet werden, wie es in Figur 1 dargestellt ist. Dieses umfasst einen Kraftstofftank 1 1 , in dem eine Kraftstoffleitung mit einem Kraftstofffilter 1 1 1 endet, die zu einer Kraftstoffförderpumpe 1 12 führt. Die Kraft- stoffförderpumpe 1 12 fördert Kraftstoff durch einen Filter 12 zu einer Hochdruckkolbenpumpe 13. Diese transportiert Kraftstoff durch eine Hochdruckzuleitung 14 zu einem Rail 15. Zur Versorgung einer Vierzylinderverbrennungskraftmaschine weist das Rail 15 vier Stichleitungen 16 auf, die jeweils in einem Injektor 17 enden. Jeder Injektor 17 ist mit einer Kraftstoffrückleitung 18 verbunden, die im Kraftstofftank 1 1 endet. Die Steuerung der Hochdruckförderpumpe 13 und der Injektoren 17 erfolgt durch ein Steuergerät 19. Embodiments of the invention The method according to the invention can be used for operating a known common rail injection system, as shown in FIG. This includes a fuel tank 1 1, in which a fuel line with a fuel filter 1 1 1 ends, which leads to a fuel pump 1 12. The fuel pump 1 12 conveys fuel through a filter 12 to a high pressure piston pump 13. This transports fuel through a high pressure feed line 14 to a rail 15. To supply a four-cylinder internal combustion engine, the rail 15 four stubs 16, each ending in an injector 17. Each injector 17 is connected to a fuel return line 18 which terminates in the fuel tank 11. The control of the high-pressure pump 13 and the injectors 17 is effected by a control unit 19.
Der Aufbau eines Injektors 17 ist schematisch in Figur 2 dargestellt. Der Injektor weist ein Steuerventil 171 auf, welches in einem Ventilraum 172 angeordnet ist. Im Falle eines Piezo- Injektors wird ein piezoelektrischer Steller (nicht gezeigt) durch Anlegen von elektrischer Spannung verformt und es kommt zu einem gewissen Hub, der über einen hydraulischen Koppler vergrößert und an das Steuerventil 171 weitergegeben wird. Der Ventilraum 172 ist über einen Auslass 173 mit einem Steuervolumen 174 verbunden, welches über einen Einlass 175 mit einem Ventilraum 176 eines Injektorventils verbunden ist, welches eine Ventilnadel 177 aufweist und der Kraftstoffinjektion in einem Zylinder der Verbrennungskraftmaschine dient. Ein Bypass 178 verbindet die beiden Ventilräume 172, 176. Das Steuerventil 172 kann den Bypass 178 verschließen, sodass der Druck im Steuervolumen 174 fällt. Die Düsennadel 177 wird dann über den Druck im Rail 15 nach innen gedrückt und die Lochdüse des Ventilraums 176 ist nicht mehr über die Düsennadel 177 verschlossen. Es kommt zu einer Einspritzung. Wird die elektrische Spannung nun wieder vom Aktivator genommen, wird der Bypass 178 wieder über das Steuerventil 172 geöffnet. Im Steuervolumen 174 baut sich Druck auf und die Düsennadel 177 wird nach unten geschoben. Die Düse ist wieder über die Düsennadel 177 verschlossen und die Einspritzung wurde gestoppt. The construction of an injector 17 is shown schematically in FIG. The injector has a control valve 171, which is arranged in a valve chamber 172. In the case of a piezo injector, a piezoelectric actuator (not shown) is deformed by application of electrical voltage and there is a certain stroke, which is increased by a hydraulic coupler and passed to the control valve 171. The valve space 172 is connected via an outlet 173 to a control volume 174, which is connected via an inlet 175 to a valve chamber 176 of an injector valve, which has a valve needle 177 and the fuel injection in a cylinder of the internal combustion engine is used. A bypass 178 connects the two valve chambers 172, 176. The control valve 172 can close the bypass 178, so that the pressure in the control volume 174 falls. The nozzle needle 177 is then pressed inwards via the pressure in the rail 15 and the hole nozzle of the valve chamber 176 is no longer closed by the nozzle needle 177. It comes to an injection. If the electrical voltage is now taken back from the activator, the bypass 178 is opened again via the control valve 172. In the control volume 174 pressure builds up and the nozzle needle 177 is pushed down. The nozzle is closed again via the nozzle needle 177 and the injection was stopped.
In einem herkömmlichen Verfahren zum Betreiben eines Common-Rail- Einspritzsystems gemäß den Figuren 1 und 2, wie es aus der DE 10 2008 043 165 A1 bekannt ist, erfolgt abwechselnd eine Einfacheinspritzung, die aus einerIn a conventional method for operating a common rail injection system according to Figures 1 and 2, as is known from DE 10 2008 043 165 A1, takes place alternately a single injection, which consists of a
Haupteinspritzung 21 1 besteht, und eine Zweifacheinspritzung, welche aus einer Voreinspritzung 221 und einer Haupteinspritzung 212 besteht. Zur Kompensation des Druckeinflusses der Voreinspritzung 221 ist die Haupteinspritzung 212 um einen Betrag 212a verlängert. Dies ist in Figur 3 gezeigt. Main injection 21 1, and a double injection, which consists of a Pre-injection 221 and a main injection 212 is. To compensate for the pressure influence of the pilot injection 221, the main injection 212 is extended by an amount 212a. This is shown in FIG.
Figur 4 zeigt eine Ausführungsform des erfindungsgemäßen Verfahrens zum Betreiben eines Common-Rail-Einspritzsystems 1 . Abwechselnd erfolgen eine herkömmliche Voreinspritzungsansteuerung 321 , auf die eine Haupteinspritzung 31 1 folgt, sowie eine Voreinspritzungsansteuerung 331 über einen so kurzen Zeitraum, dass sie nicht zu einem Öffnen und Schließen des Injektorventils 176, 177 führt, die jedoch lang genug ist, um zum Öffnen und Schließen des Steuerventils 171 des Injektors 17 zu führen. Dieser wird ebenfalls von einer Haupteinspritzung 312 gefolgt. In dieser Ausführungsform des erfindungsgemäßen Verfahrens ist der Druckeinfluss der beiden Voreinspritzungsansteuerungen 321 , 331 auf die beiden Haupteinspritzungen 31 1 , 312 gleich, sodass keine Kompensation des Druckwelleneinflusses erfolgen muss. FIG. 4 shows an embodiment of the method according to the invention for operating a common-rail injection system 1. Alternately, a conventional pilot injection 321 followed by a main injection 31 1 and a pilot injection 331 for such a short period of time that it does not open and close the injector valve 176, 177 but is long enough to open and Close the control valve 171 of the injector 17 to lead. This is also followed by a main injection 312. In this embodiment of the method according to the invention, the pressure influence of the two pilot injections 321, 331 on the two main injections 31 1, 312 is equal, so that no compensation of the pressure wave influence has to take place.
Figur 5 zeigt den Ablauf einer anderen Ausführungsform des erfindungsgemäßen Verfahrens. Abwechselnd gehen einer ersten Haupteinspritzung 333 zwei herkömmliche Voreinspritzungsansteuerungen 322, 323 voran, und einer zweiten Haupteinspritzung 334 geht eine herkömmliche Voreinspritzung 324 voran, welcher eine Voreinspritzungsansteuerung 332 vorangeht, die über einen so kurzen Zeitraum erfolgt, dass sie nicht zum Öffnen und Schließen des Injektorventils 176, 177 führt, allerdings ausreichend, um ein Öffnen und Schließen des Steuerventils 171 des Injektors 17 auszulösen. Auch in dieser Ausführungsform des erfindungsgemäßen Verfahrens ist der Druckwelleneinfluss auf die beiden Haupteinspritzungen 333, 334 identisch, sodass keine Kompensation des Druckwelleneinflusses notwendig ist. Die Ausführung dieser Ausführungsform des erfindungsgemäßen Verfahrens mit jeweils zwei Voreinspritzungsansteuerungen führt zu einer sehr geringen Geräuschentwicklung der Verbrennungskraftmaschine. FIG. 5 shows the sequence of another embodiment of the method according to the invention. Alternately, a first main injection 333 is preceded by two conventional pilot injections 322, 323, and a second main injection 334 is preceded by a conventional pilot injection 324, which is preceded by a pilot injection 332 that occurs for such a short period of time not to open and close the injector valve 176 , 177, but sufficient to trigger opening and closing of the control valve 171 of the injector 17. Also in this embodiment of the method according to the invention, the pressure wave influence on the two main injections 333, 334 is identical, so that no compensation of the pressure wave influence is necessary. The execution of this embodiment of the method according to the invention, each with two pilot injections leads to a very low noise level of the internal combustion engine.
Indem im erfindungsgemäßen Verfahren eine Bedatung der Druckwellenkompensation entfallen kann, kann dieses einfach als Computerprogramm im Steuergerät 19 appliziert werden. By eliminating the pressure wave compensation in the method according to the invention, this can be simply applied as a computer program in the control unit 19.

Claims

Ansprüche Expectations
1 . Verfahren zum Betreiben eines Common-Rail-Einspritzsystems (1 ) einer Verbrennungskraftmaschine, wobei jeder Kraftstoff-Haupteinspritzung (31 1 , 312, 333, 334) mindestens eine Voreinspntzungsansteuerung (321 , 322, 323, 324, 331 , 332) vorangeht und mindestens eine Voreinspntzungsansteuerung (331 , 332) über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils (176, 177) des Common-Rail-Einspritzsystems (1 ) führt. 1 . Method for operating a common rail injection system (1) of an internal combustion engine, each main fuel injection (31 1, 312, 333, 334) being preceded by at least one pre-injection control (321, 322, 323, 324, 331, 332) and at least one Pre-injection control (331, 332) takes place over such a short period of time that it does not lead to an injector valve (176, 177) of the common rail injection system (1) being opened and closed.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die mindestens eine Voreinspntzungsansteuerung (331 , 332), die über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines 2. The method according to claim 1, characterized in that the at least one pre-injection control (331, 332), which takes place over such a short period of time that it does not lead to an opening and closing
Injektorventils (176, 177) des Common-Rail-Einspritzsystems (1 ) führt, mindestens über einen so langen Zeitraum erfolgt, dass sie zum Öffnen und Schließen eines Steuerventils (171 ) eines Injektors (17) der Verbrennungskraftmaschine führt. Injector valve (176, 177) of the common rail injection system (1), takes place at least over such a long period of time that it leads to the opening and closing of a control valve (171) of an injector (17) of the internal combustion engine.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass jeder zweiten Kraftstoff-Haupteinspritzung (312, 314) eine Voreinspntzungsansteuerung (331 , 332) vorangeht, die über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils (176, 177) des Common-Rail-Einspritzsystems (1 ) führt. 3. The method according to claim 1 or 2, characterized in that every second main fuel injection (312, 314) is preceded by a pre-injection control (331, 332), which takes place over such a short period of time that it does not cause an injector valve to open and close (176, 177) of the common rail injection system (1).
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jeder Kraftstoffhaupteinspritzung (31 1 , 312, 333, 334) eine Voreinspntzungsansteuerung (321 , 322, 323, 324, 331 , 332) vorangeht. 4. The method according to one of claims 1 to 3, characterized in that each main fuel injection (31 1, 312, 333, 334) is preceded by a pre-injection control (321, 322, 323, 324, 331, 332).
5. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jeder Kraftstoffhaupteinspritzung (333, 334) mehrere Voreinspritzungsan- steuerungen (322, 323, 324, 332) vorangehen und mindestens eine Voreinspntzungsansteuerung (332), welche einer anderen Voreinspritzungsan- Steuerung (324) vorangeht, über einen so kurzen Zeitraum erfolgt, dass sie nicht zu einem Öffnen und Schließen eines Injektorventils (176, 177) des Common-Rail-Einspritzsystems (1 ) führt. 5. The method according to one of claims 1 to 3, characterized in that each main fuel injection (333, 334) is preceded by several pre-injection controls (322, 323, 324, 332) and at least one pre-injection control (332), which is assigned to another pre-injection control. Control (324) precedes, takes place over such a short period of time that it does not lead to an opening and closing of an injector valve (176, 177) of the common rail injection system (1).
Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass jeder Kraftstoffhaupteinspritzung (333, 334) zwei Voreinspntzungsansteuerungen (322, 323, 324, 332) vorangehen. Method according to claim 5, characterized in that each main fuel injection (333, 334) is preceded by two pre-injection controls (322, 323, 324, 332).
Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass während einer Kalibrierung ein Einspritzmuster ermittelt wird, das die Haupteinspritzungen (31 1 , 312, 333, 334) und die Voreinspntzungsansteuerungen (321 , 322, 323, 324, 331 , 332) umfasst. Method according to one of claims 1 to 6, characterized in that an injection pattern is determined during calibration which contains the main injections (31 1, 312, 333, 334) and the pre-injection controls (321, 322, 323, 324, 331, 332). includes.
Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass es sich bei der Kalibrierung um eine Nullmengenkalibrierung handelt. Method according to claim 7, characterized in that the calibration is a zero quantity calibration.
9. Computerprogramm, das alle Schritte eines Verfahrens nach einem der Ansprüche 1 bis 8 ausführt, wenn es auf einem Rechengerät oder Steuergerät (19) abläuft. 9. Computer program that carries out all the steps of a method according to one of claims 1 to 8 when it runs on a computing device or control device (19).
10. Computerprogrammprodukt mit Programmcode, der auf einem maschinenlesbaren Träger gespeichert ist, zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 8, wenn das Programm auf einem Computer oder Steuergerät (19) ausgeführt wird. 10. Computer program product with program code which is stored on a machine-readable carrier for carrying out the method according to one of claims 1 to 8 when the program is executed on a computer or control device (19).
PCT/EP2013/060499 2012-06-22 2013-05-22 Method for operating a common rail injection system WO2013189682A1 (en)

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CN201380032321.3A CN104364505B (en) 2012-06-22 2013-05-22 Method for running common-rail injection system
IN7784DEN2014 IN2014DN07784A (en) 2012-06-22 2013-05-22

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JP6056895B2 (en) * 2015-03-23 2017-01-11 マツダ株式会社 Fuel injection control device for direct injection engine
DE102016217308A1 (en) * 2016-09-12 2018-03-15 Robert Bosch Gmbh Method for controlling multiple injections in an injection system

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EP1365135A2 (en) * 2002-05-21 2003-11-26 Toyota Jidosha Kabushiki Kaisha A fuel injection control device
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DE102008043575A1 (en) * 2008-11-07 2010-05-12 Robert Bosch Gmbh Method for calibrating injection amount of partial injection in fuel injection system under operating condition of internal-combustion engine, involves carrying single fuel injection and multiple fuel injections at individual cylinder

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FR2833654A1 (en) * 2001-12-17 2003-06-20 Renault Fuel injection control procedure especially for engine with common manifold by creating oscillations in feed pipe to give increased pressure
EP1365135A2 (en) * 2002-05-21 2003-11-26 Toyota Jidosha Kabushiki Kaisha A fuel injection control device
DE102006037170A1 (en) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Automotive fuel injection system for vehicles with electrically-operated servo-valves has two overlapping injection phases per injection cycle
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DE102008043165A1 (en) 2008-10-24 2010-04-29 Robert Bosch Gmbh Method for calibrating amount of partial fuel injection into fuel injection system of internal combustion engine of motor vehicle, involves determining correction value for fuel injection by stimulating pattern and by changing vibration
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CN104364505B (en) 2017-06-13

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