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DE102008033754A1 - Method for determining the mass of the injected fuel - Google Patents

Method for determining the mass of the injected fuel Download PDF

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Publication number
DE102008033754A1
DE102008033754A1 DE200810033754 DE102008033754A DE102008033754A1 DE 102008033754 A1 DE102008033754 A1 DE 102008033754A1 DE 200810033754 DE200810033754 DE 200810033754 DE 102008033754 A DE102008033754 A DE 102008033754A DE 102008033754 A1 DE102008033754 A1 DE 102008033754A1
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DE
Germany
Prior art keywords
mass
fuel
rail
pressure
injected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE200810033754
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German (de)
Inventor
Gianluca Dr. Caretta
Hui Li
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.)
Continental Automotive GmbH
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Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to DE200810033754 priority Critical patent/DE102008033754A1/en
Priority to PCT/EP2009/058596 priority patent/WO2010006960A1/en
Publication of DE102008033754A1 publication Critical patent/DE102008033754A1/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • F02D2200/0616—Actual fuel mass or fuel injection amount determined by estimation
    • 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
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

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

Abstract

Es wird ein Verfahren zum Ermitteln der Masse des in einen Zylinder eines Verbrennungsmotors eingespritzten Kraftstoffs bei Kraftfahrzeugen beschrieben, die mit einem Common-Rail-Einspritzsystem versehen sind. Bei dem Verfahren wird der Raildruck vor und nach einem Einspritzvorgang gemessen. Aus der ermittelten Druckdifferenz wird die Masse des eingespritzten Kraftstoffs errechnet. Dieses Verfahren lässt sich besonders einfach und kostengünstig ausführen.A method is described for determining the mass of the fuel injected into a cylinder of an internal combustion engine in motor vehicles provided with a common rail injection system. In the method, the rail pressure is measured before and after an injection process. From the determined pressure difference, the mass of the injected fuel is calculated. This method can be carried out particularly easily and inexpensively.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Ermitteln der Masse des in einen Zylinder eines Verbrennungsmotors eingespritzten Kraftstoffs bei Kraftfahrzeugen, die mit Common-Rail-Einspritzsystem versehen sind.The The present invention relates to a method for determining the mass of the fuel injected into a cylinder of an internal combustion engine Motor vehicles equipped with common rail injection system.

Derartige Common-Rail-Einspritzsysteme sind bekannt. Als Common-Rail wird hierbei ein gemeinsamer Kraftstoffhochdruckspeicher bezeichnet, über den die einzelnen Injektoren mit Kraftstoff beaufschlagt werden.such Common rail injection systems are known. As a common rail is Here, a common high-pressure fuel storage referred to, over the The individual injectors are supplied with fuel.

Es ist erwünscht, die Masse bzw. Gesamtmasse des von jedem Injektor eingespritzten Kraftstoffs zu ermitteln, um auf diese Weise eine Drehmomentüberwachung durchführen und/oder eine entsprechende Alterungskompensation ausführen zu können. Eine derartige Ermittlung der Masse bzw. Gesamtmasse des eingespritzten Kraftstoffs hat man bisher mit Hilfe eines zusätzlichen Chips durchgeführt, mit dem man über eine Messung des elektrischen Stromes für die Einspritzung die Kraftstoffmasse und das Drehmoment ermittelt hat.It is desired the mass of the injector injected by each injector Fuel to determine in this way a torque monitoring carry out and / or to be able to carry out a corresponding aging compensation. A Such determination of the mass or total mass of the injected Fuel has been done with the help of an additional chip, with you over a measurement of the electric current for the injection the fuel mass and has determined the torque.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, das sich auf besonders einfache und kostengünstige Art ausführen lässt.Of the The present invention is based on the object, a method of the type mentioned above, which is particularly simple and cost-effective Perform kind leaves.

Diese Aufgabe wird erfindungsgemäß bei einem Verfahren der angegebenen Art durch die folgenden Schritte gelöst:
Messen des Raildrucks p1 vor einem Einspritzvorgang;
Messen des Raildruck p2 nach dem Einspritzvorgang;
Ermitteln der Druckdifferenz Δp = p1 – p2; und
Berechnen der Masse des eingespritzten Kraftstoffs aus der ermittelten Druckdifferenz Δp.This object is achieved in a method of the type indicated by the following steps:
Measuring the rail pressure p 1 before an injection process;
Measuring the rail pressure p 2 after the injection process;
Determining the pressure difference Δp = p 1 - p 2 ; and
Calculating the mass of the injected fuel from the determined pressure difference Δp.

Bei dem erfindungsgemäßen Verfahren wird die Masse des eingespritzten Kraftstoffs unter Verwendung des Raildrucksignales ermittelt. Der Druck p im Rail kann wie folgt charakterisiert werden:

Figure 00020001
worin E der Kompressionsmodul des Kraftstoffs, V das Volumen des Rails, Qi der Volumenstrom in das Railvolumen oder aus dem Railvolumen und t die Zeit bedeuten.In the method according to the invention, the mass of the injected fuel is determined using the rail pressure signal. The pressure p in the rail can be characterized as follows:
Figure 00020001
where E is the compression modulus of the fuel, V is the volume of the rail, Q i is the volume flow into the rail volume or from the rail volume and t is the time.

Vor dem Beginn der Einspritzung ist der Raildruck konstant und liegt nahe am Sollwert. Während der Einspritzphase fällt der Druck unter Schwingungen ab. Sobald die Einspritzphase beendet wird, nehmen die Schwingungen rasch ab, und es wird ein mittleres Raildruckniveau erreicht, das einem geringeren Druck entspricht. Durch Messen der Druckdifferenz Δp vor und nach der Einspritzung kann daher die Masse bzw. Gesamtmasse des eingespritzten Kraftstoffs ermittelt werden.In front the beginning of the injection, the rail pressure is constant and is close to the setpoint. During the Injection phase falls the pressure decreases under vibrations. As soon as the injection phase ends the vibrations decrease rapidly, and it becomes a medium Rail pressure reached, which corresponds to a lower pressure. By measuring the pressure difference Δp Before and after injection, therefore, the mass or total mass of the injected fuel.

Δp lässt sich in der folgenden Weise ausdrücken:

Figure 00020002
worin MF_INJ die Masse des eingespritzten Kraftstoffs, ρ die Dichte des Kraftstoffs und k(p, T) ein experimentell ermittelter Korrekturwert, der vom Druck p und der Kraftstofftemperatur T im Rail abhängig ist, bedeuten.Δp can be expressed in the following way:
Figure 00020002
where MF_INJ is the mass of the injected fuel, ρ is the density of the fuel, and k (p, T) is an experimentally determined correction value that is dependent on the pressure p and the fuel temperature T in the rail.

Auf Basis von der obigen Gleichung kann MF_INJ wie folgt ermittelt (errechnet) werden: MF_INJ = (Δp ρ V k(p, T))/E Based on the above equation, MF_INJ can be calculated (calculated) as follows: MF_INJ = (Δp ρVk (p, T)) / E

Auf diese Weise lässt sich die Masse des eingespritzten Kraftstoffs einfach und kostengünstig ermitteln. Es ist hierfür kein zusätzlicher Chip erforderlich.On that way the mass of the injected fuel can be determined easily and inexpensively. It is for this no additional Chip required.

Das erfindungsgemäße Verfahren wird vorzugsweise zur Ermittlung der Gesamtmasse des von jedem Injektor eingespritzten Kraftstoffs verwendet. Auf der Basis der ermittelten Masse bzw. Gesamtmasse des eingespritzten Kraftstoffs wird es vorteilhafter Weise zur Drehmomentüberwachung eingesetzt.The inventive method is preferably used to determine the total mass of each injector injected fuel used. On the basis of the determined Mass or total mass of the injected fuel, it is more advantageous Way for torque monitoring used.

Zur besseren Erläuterung des erfindungsgemäßen Verfahrens dienen die beigefügten Figuren. Hiervon zeigen:to better explanation the method according to the invention serve the attached Characters. Hereof show:

1 den Verlauf des Raildrucks während einer Einspritzphase; und 1 the course of the rail pressure during an injection phase; and

2 ein Diagramm, das die Beziehung zwischen der Druckdifferenz und der Masse des gesamten eingespritzten Kraftstoff zeigt. 2 a diagram showing the relationship between the pressure difference and the mass of the total injected fuel.

Aus 1 kann man entnehmen, dass vor dem Beginn eines Einspritzvorgangs der Raildruck im Wesentlichen konstant ist und nahe am Sollwert liegt. Während der Einspritzphase fällt der Druck unter Schwingungen ab. Bei Beendigung der Ein spritzphase nehmen die Schwingungen rasch ab, und es wird ein Durchschnittswert des Raildrucks erreicht, der geringer ist als der Ausgangsdruck. Durch Ermittlung der Druckdifferenz p1 – p2 vor und nach dem Einspritzvorgang lässt sich somit die Masse bzw. die Gesamtmasse des eingespritzten Kraftstoffs errechnen.Out 1 It can be seen that before the start of an injection process, the rail pressure is substantially constant and close to the target value. During the injection phase, the pressure drops under vibrations. At the end of the injection phase, the vibrations decrease rapidly and an average value of the rail pressure which is lower than the output pressure is reached. By determining the pressure difference p 1 -p 2 before and after the injection process, the mass or the total mass of the injected fuel can thus be calculated.

2 zeigt in einem Diagramm die Beziehung zwischen der Druckdifferenz Δp und der Masse des gesamten eingespritzten Kraftstoffs aufgrund einer vollständigen experimentellen Ermittlung. 2 Fig. 2 is a graph showing the relationship between the pressure difference Δp and the mass of the total injected fuel due to ei full experimental investigation.

Claims (4)

Verfahren zum Ermitteln der Masse des in einen Zylinder eines Verbrennungsmotors eingespritzten Kraftstoffs bei Kraftfahrzeugen, die mit einem Common-Rail-Einspritzsystem versehen sind, gekennzeichnet durch die folgenden Schritte: Messen des Raildrucks p1 vor einem Einspritzvorgang; Messen des Raildrucks p2 nach dem Einspritzvorgang; Ermitteln der Druckdifferenz Δp = p1 – p2; und Berechnen der Masse des eingespritzten Kraftstoffs aus der ermittelten Druckdifferenz Δp.A method for determining the mass of the fuel injected into a cylinder of an internal combustion engine in motor vehicles, which are provided with a common rail injection system, characterized by the following steps: measuring the rail pressure p 1 before an injection process; Measuring the rail pressure p 2 after the injection process; Determining the pressure difference Δp = p 1 - p 2 ; and calculating the mass of the injected fuel from the determined pressure difference Δp. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Masse des eingespritzten Kraftstoffs nach der Gleichung MF_INJ = (Δp ρ V k(p, T))/E berechnet wird, worin bedeuten: MF_INJ = Masse des eingespritzten Kraftstoffs Δp = Differenz des Raildrucks vor und nach dem Einspritzvorgang ρ = Dichte des Kraftstoffs k(p, T) = experimentell ermittelter Korrekturwert, der vom Druck p und der Kraftstofftemperatur T im Rail abhängig ist E = Kompressionsmodul V = Volumen des Rail.Method according to claim 1, characterized in that that the mass of injected fuel according to the equation MF_INJ = (Δp ρVk (p, T)) / E is calculated, in which mean: MF_INJ = mass of the injected fuel Ap = Difference of the rail pressure before and after the injection process ρ = density of the fuel k (p, T) = experimentally determined correction value, which depends on the pressure p and the fuel temperature T in the rail e = Compression module V = volume of the rail. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es zur Ermittlung der Gesamtmasse des von jedem Injektor eingespritzten Kraftstoffs verwendet wird.Method according to claim 1 or 2, characterized that it is used to determine the total mass of injected from each injector Fuel is used. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass es auf der Basis der ermittelten Masse bzw. Gesamtmasse des eingespritzten Kraftstoffs zur Drehmomentüberwachung eingesetzt wird.Method according to one of the preceding claims, characterized characterized in that it is based on the determined mass or Total mass of injected fuel for torque monitoring is used.
DE200810033754 2008-07-18 2008-07-18 Method for determining the mass of the injected fuel Ceased DE102008033754A1 (en)

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DE200810033754 DE102008033754A1 (en) 2008-07-18 2008-07-18 Method for determining the mass of the injected fuel
PCT/EP2009/058596 WO2010006960A1 (en) 2008-07-18 2009-07-07 Method for determining the mass of the injected fuel

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011092042A1 (en) * 2010-01-29 2011-08-04 Robert Bosch Gmbh Process and device for testing a fuel injector
EP2518297A3 (en) * 2011-04-30 2014-03-05 Volkswagen Aktiengesellschaft Detection and reduction of an injection volume difference in a combustion engine with multiple cylinders
WO2016177504A1 (en) * 2015-05-06 2016-11-10 Continental Automotive Gmbh Determination method for determining an absolute value of an injected fuel mass
WO2023101700A1 (en) * 2021-11-30 2023-06-08 Cummins Inc. High pressure fuel system controls, diagnostics, and prognostics using fuel mass change estimates
DE102022209727A1 (en) 2022-09-16 2024-03-21 Vitesco Technologies GmbH Method for operating a fuel injection system of an internal combustion engine
DE102023202936A1 (en) 2023-03-30 2024-10-02 Vitesco Technologies GmbH Method and control device for operating a fuel injection system of an internal combustion engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19700738C1 (en) * 1997-01-11 1998-04-16 Daimler Benz Ag Fuel injection priming charge regulation method for IC engines
DE10357158B4 (en) * 2003-12-06 2013-02-07 Bayerische Motoren Werke Aktiengesellschaft Method for correcting the injection duration of an injector for an internal combustion engine
DE102005058445B3 (en) * 2005-12-07 2007-04-26 Siemens Ag Fuel amount reporting process for internal combustion engine cylinder involves detecting setting or movement signals at least when engine is switched off
WO2008092779A1 (en) * 2007-01-29 2008-08-07 Continental Automotive Gmbh Method and device for correcting fuel injection

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011092042A1 (en) * 2010-01-29 2011-08-04 Robert Bosch Gmbh Process and device for testing a fuel injector
US8646322B2 (en) 2010-01-29 2014-02-11 Robert Bosch Gmbh Method and device for testing a fuel injector
EP2518297A3 (en) * 2011-04-30 2014-03-05 Volkswagen Aktiengesellschaft Detection and reduction of an injection volume difference in a combustion engine with multiple cylinders
WO2016177504A1 (en) * 2015-05-06 2016-11-10 Continental Automotive Gmbh Determination method for determining an absolute value of an injected fuel mass
WO2023101700A1 (en) * 2021-11-30 2023-06-08 Cummins Inc. High pressure fuel system controls, diagnostics, and prognostics using fuel mass change estimates
DE102022209727A1 (en) 2022-09-16 2024-03-21 Vitesco Technologies GmbH Method for operating a fuel injection system of an internal combustion engine
DE102022209727B4 (en) 2022-09-16 2024-03-28 Vitesco Technologies GmbH Method for operating a fuel injection system of an internal combustion engine
DE102023202936A1 (en) 2023-03-30 2024-10-02 Vitesco Technologies GmbH Method and control device for operating a fuel injection system of an internal combustion engine

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Effective date: 20140506