Nothing Special   »   [go: up one dir, main page]

EP2184473A2 - Method and device for testing a pressure sensor of a fuel injection device - Google Patents

Method and device for testing a pressure sensor of a fuel injection device Download PDF

Info

Publication number
EP2184473A2
EP2184473A2 EP09170017A EP09170017A EP2184473A2 EP 2184473 A2 EP2184473 A2 EP 2184473A2 EP 09170017 A EP09170017 A EP 09170017A EP 09170017 A EP09170017 A EP 09170017A EP 2184473 A2 EP2184473 A2 EP 2184473A2
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
pressure sensor
injection
difference
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.)
Withdrawn
Application number
EP09170017A
Other languages
German (de)
French (fr)
Other versions
EP2184473A3 (en
Inventor
Rene Zieher
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 EP2184473A2 publication Critical patent/EP2184473A2/en
Publication of EP2184473A3 publication Critical patent/EP2184473A3/en
Withdrawn legal-status Critical Current

Links

Images

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
    • F02D41/3836—Controlling the fuel pressure
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure sensors

Definitions

  • the present invention relates to a method for checking a pressure sensor of a fuel injection device, in particular of a motor vehicle, wherein the fuel injection device has a pressure accumulator, which is associated with the pressure sensor and an injection valve, wherein the method, an amount of fuel is injected under pressure from the injection valve.
  • the invention relates to a device for checking a pressure sensor of a fuel injection device, in particular of a motor vehicle, wherein the fuel injection device has a pressure accumulator, which is associated with the pressure sensor and an injection valve, wherein an amount of fuel can be injected under pressure from the injection valve.
  • the current legislation requires the monitoring of components of the injection system. This includes the pressure sensor. This must be monitored for its signal.
  • the publication DE 10 2004 028 891 A1 describes a method for operating an internal combustion engine, in particular a motor vehicle, in which the pressure sensor measures the pressure acting on the fuel to be injected and inaccuracies and deviations of the measured from the actual pressure are determined and corrected. At this time, fuel is injected under an actual pressure from an injector, and a pressure from the pressure sensor is measured. A difference signal is determined which represents a deviation of the pressure measured by the pressure sensor from the actual pressure. On the basis of the difference signal, a correction of the signal measured by the pressure sensor can be made.
  • the present invention has for its object to improve the detection of inaccuracies and malfunctions of the pressure sensor.
  • no other components in particular no further pressure sensor, are used to verify the pressure measured by the pressure sensor.
  • the pressure difference is compared with a pressure difference detected by measuring the pressure, in particular by a targeted scanning of the pressure, and the pressure sensor is evaluated as a function of this.
  • the pressure sensor is evaluated as a function of this.
  • the device comprises means for determining a pressure difference, which is caused by a pressure drop due to the injection process, in dependence on the pressure and the amount of fuel ,
  • the pressure drop can thus be determined by means of only two factors, the steady-state adjusted pressure and the injected fuel quantity.
  • the device comprises means for comparing the pressure difference with a pressure difference detected by measuring the pressure, in particular by a targeted scanning of the pressure, and means for evaluating the pressure sensor as a function of the comparison.
  • the means comprise an electrical control device.
  • the means comprise a computer program executable on a computing device, in particular a processor. A computer program is easily changeable and interchangeable.
  • FIG. 1 a fuel supply system 1 of an internal combustion engine is shown in simplified form.
  • the fuel supply system 1 is usually also referred to as a common rail system and is suitable for the direct injection of fuel into the combustion chambers of the internal combustion engine under high pressure.
  • the fuel passes from a fuel tank 3 via various controlled by a controller D aid 5 to a high-pressure pump 7.
  • the high-pressure pump 7 is connected to a fuel reservoir 9, which is often referred to as a rail.
  • the fuel reservoir 9 is connected via fuel lines with injection valves 11 in contact. About the injectors 11, the fuel is injected into the combustion chambers of the internal combustion engine.
  • Connected to the fuel accumulator 9 is a pressure regulating valve 15, which is coupled on the output side to the fuel tank 3.
  • the pressure in the fuel accumulator 9 is measured with a pressure sensor S, in accordance with the measurement data, for example, to control the pressure regulating valve 15 with the control unit D accordingly.
  • An in FIG. 2a illustrated characteristic 25 shows an example of the injection process.
  • the ordinate indicates the opening state of the injection valve 11 and thus the injection rate and the abscissa the time.
  • An in FIG. 2b characteristic curve 27 shows the pressure curve in the fuel accumulator 9, which at the same time to the in FIG. 2a shown injection process results.
  • the ordinate represents the current pressure in the fuel accumulator 9 and the abscissa represents the time.
  • FIG. 2b also shows two measurement times 29 and 31, each representing an observation time at which the clocked measured pressure is detected.
  • the measuring time 29 represents the detection of the steady-state pressure p1 before the beginning of the injection process, the measuring time 31 the measured pressure p1 after the injection. It is based on the characteristic 27 in FIG. 2b recognizable that the pressure p1 in the context of in FIG. 2a decreases injection process shown decreases.
  • FIG. 3 shows a block diagram of the inventive solution for checking the signal of the pressure sensor S.
  • the detected by the pressure sensor S pressure p1 in the fuel reservoir 9 is measured continuously clocked and fed the measurement signal to the control unit D.
  • the control unit D determines from the pressure difference in the fuel storage at the beginning and at the end of the injection process, the difference value corresponding to a real pressure drop ⁇ p2.
  • the pressure signal p1 is supplied to a modeling M together with a signal Q representing the injection quantity.
  • the modeling M determines a target pressure difference ⁇ p1, which corresponds to the real pressure drop ⁇ p2 in the fuel accumulator 9 due to such an injection process, on the basis of the pressure p1 and the injection quantity Q, which are adjusted in a stationary manner at the beginning of the injection process, by a mathematical simulation of the injection process. From the two pressure differences .DELTA.p1 and .DELTA.p2, a difference signal e is generated, which provides information on whether and to what extent a deviation of the measured by sampling, real pressure difference .DELTA.p2 of the determined by means of modeling M target pressure difference .DELTA.p1 is present. For example, due to a correspondingly high deviation, an error can be deduced.
  • the invention thus makes it possible to observe and monitor the pressure profile due to a known stationary adjusted injection pressure and a known injection quantity, wherein in particular no further pressure sensor and no additional function variables for legally compliant checking are required.

Landscapes

  • 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)
  • Fuel-Injection Apparatus (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The method involves assigning a pressure accumulator of a fuel injection device to a pressure sensor (S) and an injection valve. A fuel amount (Q) is injected into the injection valve below a stationary adjustable pressure (p1) in the pressure accumulator. A pressure difference (deltap1), which is developed by a pressure drop based on the injection process, is determined depending on the stationary adjustable pressure and the injected fuel amount. An independent claim is also included for a device for testing a pressure sensor of a fuel injection device of a motor vehicle.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft ein Verfahren zur Überprüfung eines Drucksensors einer Kraftstoffeinspritzeinrichtung, insbesondere eines Kraftfahrzeugs, wobei die Kraftstoffeinspritzeinrichtung einen Druckspeicher aufweist, dem der Drucksensor und ein Einspritzventil zugeordnet ist, wobei bei dem Verfahren eine Kraftstoffmenge unter einem Druck von dem Einspritzventil eingespritzt wird. Außerdem betrifft die Erfindung eine Vorrichtung zur Überprüfung eines Drucksensors einer Kraftstoffeinspritzeinrichtung, insbesondere eines Kraftfahrzeugs, wobei die Kraftstoffeinspritzeinrichtung einen Druckspeicher aufweist, dem der Drucksensor und ein Einspritzventil zugeordnet ist, wobei eine Kraftstoffmenge unter einem Druck von dem Einspritzventil einspritzbar ist.The present invention relates to a method for checking a pressure sensor of a fuel injection device, in particular of a motor vehicle, wherein the fuel injection device has a pressure accumulator, which is associated with the pressure sensor and an injection valve, wherein the method, an amount of fuel is injected under pressure from the injection valve. Moreover, the invention relates to a device for checking a pressure sensor of a fuel injection device, in particular of a motor vehicle, wherein the fuel injection device has a pressure accumulator, which is associated with the pressure sensor and an injection valve, wherein an amount of fuel can be injected under pressure from the injection valve.

Die aktuelle Gesetzgebung fordert die Überwachung von Komponenten des Einspritzsystems. Hierunter fällt auch der Drucksensor. Dieser muss hinsichtlich seines Signals überwacht werden.The current legislation requires the monitoring of components of the injection system. This includes the pressure sensor. This must be monitored for its signal.

Eine Möglichkeit, mit der ein solcher Drucksensor überwacht werden kann, ist im Stand der Technik bereits beschrieben. Die Druckschrift DE 10 2004 028 891 A1 beschreibt ein Verfahren zum Betreiben einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, bei dem der Drucksensor den auf den einzuspritzenden Kraftstoff einwirkenden Druck misst und Ungenauigkeiten und Abweichungen des gemessenen vom tatsächlichen Druck ermittelt und korrigiert werden. Dabei wird Kraftstoff unter einem tatsächlichen Druck von einem Einspritzventil eingespritzt, und ein Druck von dem Drucksensor gemessen. Es wird ein Differenzsignal ermittelt, das eine Abweichung des von dem Drucksensor gemessenen Drucks von dem tatsächlichen Druck repräsentiert. Auf der Grundlage des Differenzsignals kann eine Korrektur des von dem Drucksensor gemessenen Signals vorgenommen werden.One way in which such a pressure sensor can be monitored has already been described in the prior art. The publication DE 10 2004 028 891 A1 describes a method for operating an internal combustion engine, in particular a motor vehicle, in which the pressure sensor measures the pressure acting on the fuel to be injected and inaccuracies and deviations of the measured from the actual pressure are determined and corrected. At this time, fuel is injected under an actual pressure from an injector, and a pressure from the pressure sensor is measured. A difference signal is determined which represents a deviation of the pressure measured by the pressure sensor from the actual pressure. On the basis of the difference signal, a correction of the signal measured by the pressure sensor can be made.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Erfassung von Ungenauigkeiten und Fehlfunktionen des Drucksensors zu verbessern. Dabei sollen keine anderen Komponenten, insbesondere kein weiterer Drucksensor, zum Einsatz kommen, um den von dem Drucksensor gemessenen Druck zu verifizieren.The present invention has for its object to improve the detection of inaccuracies and malfunctions of the pressure sensor. In this case, no other components, in particular no further pressure sensor, are used to verify the pressure measured by the pressure sensor.

Zur Lösung dieser Aufgabe wird, ausgehend von dem Verfahren der eingangs genannten Art, vorgeschlagen, dass eine Druckdifferenz die durch einen Druckeinbruch aufgrund des Einspritzvorgangs entsteht, in Abhängigkeit von dem Druck und der Kraftstoffmenge ermittelt wird. Erfiindungsgemäß ist erkannt worden, dass aufgrund der bekannten eingespritzten Kraftstoffmenge und des bekannten stationär eingeregelten Drucks der tatsächliche Druckverlauf beobachtet und überwacht werden kann.To solve this problem, it is proposed, starting from the method of the type mentioned above, that a pressure difference caused by a pressure drop due to the injection process, is determined in dependence on the pressure and the fuel quantity. Erfiindungsgemäß it has been recognized that due to the known injected fuel quantity and the known stationary regulated pressure, the actual pressure profile can be observed and monitored.

Gemäß einer vorteilhaften Ausführungsform der Erfindung wird vorgeschlagen, dass die Druckdifferenz mit einer durch Messung des Drucks, insbesondere durch ein gezieltes Abtasten des Drucks, erfassten Druckdifferenz verglichen und in Abhängigkeit davon der Drucksensor beurteilt wird. Somit reicht zur Ermittlung einer korrekten oder fehlerhaften Funktionsweise des Drucksensors ein Vergleich der beiden Druckdifferenzen und aus, wobei nur ein einziger Drucksensor zur Messung des Drucks eingesetzt werden muss.According to an advantageous embodiment of the invention, it is proposed that the pressure difference is compared with a pressure difference detected by measuring the pressure, in particular by a targeted scanning of the pressure, and the pressure sensor is evaluated as a function of this. Thus, to determine a correct or incorrect operation of the pressure sensor, a comparison of the two pressure differences and sufficient, with only a single pressure sensor must be used to measure the pressure.

Als eine weitere Lösung der Aufgabe der vorliegenden Erfindung wird, ausgehend von der Vorrichtung gemäß Oberbegriff des Anspruchs 3, vorgeschlagen, dass die Vorrichtung Mittel zur Ermittlung einer Druckdifferenz, die durch einen Druckeinbruch aufgrund des Einspritzvorgangs entsteht, in Abhängigkeit von dem Druck und der Kraftstoffmenge aufweist. Der Druckeinbruch kann somit mittels nur zwei Faktoren, dem stationär eingeregelten Druck und der eingespritzten Kraftstoffmenge, ermittelt werden.As a further solution of the object of the present invention is proposed, starting from the device according to the preamble of claim 3, that the device comprises means for determining a pressure difference, which is caused by a pressure drop due to the injection process, in dependence on the pressure and the amount of fuel , The pressure drop can thus be determined by means of only two factors, the steady-state adjusted pressure and the injected fuel quantity.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung wird vorgeschlagen, dass die Vorrichtung Mittel zum Vergleichen der Druckdifferenz mit einer durch Messung des Drucks, insbesondere durch ein gezieltes Abtasten des Drucks, erfassten Druckdifferenz und Mittel zur Beurteilung des Drucksensors in Abhängigkeit von dem Vergleich aufweist. Gemäß einer bevorzugten Ausführungsform der Erfindung wird vorgeschlagen, dass die Mittel ein elektrisches Steuergerät umfassen. Vorzugsweise umfassen die Mittel ein Computerprogramm, das auf einem Rechengerät, insbesondere einem Prozessor, ablauffähig ist. Ein Computerprogramm ist auf einfache Weise flexibel änderbar und austauschbar.According to an advantageous embodiment of the invention it is proposed that the device comprises means for comparing the pressure difference with a pressure difference detected by measuring the pressure, in particular by a targeted scanning of the pressure, and means for evaluating the pressure sensor as a function of the comparison. According to a preferred embodiment of the invention, it is proposed that the means comprise an electrical control device. Preferably, the means comprise a computer program executable on a computing device, in particular a processor. A computer program is easily changeable and interchangeable.

Offenbarung der ErfindungDisclosure of the invention

Ein bevorzugtes Ausführungsbeispiel der vorliegenden Erfindung wird nachfolgend anhand der Figuren näher erläutert. Es zeigen:

Figur 1
ein schematisches Blockschaltbild eines Ausführungsbeispiels einer Brennkraftmaschine für ein Kraftfahrzeug,
Figur 2a
die Kennlinie eines Einspritzvorgangs,
Figur 2b
den Raildruckverlauf, insbesondere während des Einspritzvorgangs,
Figur 3
ein schematisches Blockschaltbild zur Ermittlung eines Differenzsignals.
A preferred embodiment of the present invention will be explained in more detail with reference to FIGS. Show it:
FIG. 1
FIG. 2 shows a schematic block diagram of an exemplary embodiment of an internal combustion engine for a motor vehicle, FIG.
FIG. 2a
the characteristic of an injection process,
FIG. 2b
the rail pressure course, in particular during the injection process,
FIG. 3
a schematic block diagram for determining a difference signal.

In Figur 1 ist ein Kraftstoffversorgungssystem 1 einer Brennkraftmaschine vereinfacht dargestellt. Das Kraftstoffversorgungssystem 1 wird üblicherweise auch als Common-Rail-System bezeichnet und ist zur direkten Einspritzung von Kraftstoff in die Brennräume der Brennkraftmaschine unter Hochdruck geeignet. Dabei gelangt der Kraftstoff aus einem Kraftstofftank 3 über verschiedene von einem Steuergerät D gesteuerte Hilfsmittel 5 zu einer Hochdruckpumpe 7. Die Hochdruckpumpe 7 ist mit einem Kraftstoffspeicher 9 verbunden, der häufig auch als Rail bezeichnet wird. Der Kraftstoffspeicher 9 steht über Kraftstoffleitungen mit Einspritzventilen 11 in Kontakt. Über die Einspritzventile 11 wird der Kraftstoff in die Brennräume der Brennkraftmaschine eingespritzt. Mit dem Kraftstoffspeicher 9 ist ein Druckregelventil 15 verbunden, das ausgangsseitig mit dem Kraftstofftank 3 gekoppelt ist.In FIG. 1 a fuel supply system 1 of an internal combustion engine is shown in simplified form. The fuel supply system 1 is usually also referred to as a common rail system and is suitable for the direct injection of fuel into the combustion chambers of the internal combustion engine under high pressure. In this case, the fuel passes from a fuel tank 3 via various controlled by a controller D aid 5 to a high-pressure pump 7. The high-pressure pump 7 is connected to a fuel reservoir 9, which is often referred to as a rail. The fuel reservoir 9 is connected via fuel lines with injection valves 11 in contact. About the injectors 11, the fuel is injected into the combustion chambers of the internal combustion engine. Connected to the fuel accumulator 9 is a pressure regulating valve 15, which is coupled on the output side to the fuel tank 3.

Bei der Einspritzung von Kraftstoff über die Einspritzventile 11 in den Brennraum erfolgt eine Kraftstoffentnahme aus dem Kraftstoffspeicher 9, die eine Reduzierung des Drucks in dem Kraftstoffspeicher 9 zur Folge hat.During the injection of fuel via the injection valves 11 into the combustion chamber, fuel is taken from the fuel accumulator 9, which results in a reduction of the pressure in the fuel accumulator 9.

Um die einzuspritzende Kraftstoffmenge beeinflussen zu können, ist es notwendig, den Druck im Kraftstoffspeicher 9 zu regeln und/oder zu steuern. Hierzu wird mit einem Drucksensor S der Druck im Kraftstoffspeicher 9 gemessen, um gemäß den Messdaten beispielsweise das Druckregelventil 15 mit dem Steuergerät D entsprechend anzusteuern.In order to influence the amount of fuel to be injected, it is necessary to regulate and / or control the pressure in the fuel accumulator 9. For this purpose, the pressure in the fuel accumulator 9 is measured with a pressure sensor S, in accordance with the measurement data, for example, to control the pressure regulating valve 15 with the control unit D accordingly.

Dies setzt eine korrekte Funktionsweise des Drucksensors S voraus. Ungenauigkeiten, Alterungsvorgänge oder Fehlfunktionen des Drucksensors S können dazu führen, dass die von dem Einspritzventil 11 eingespritzte Kraftstoffmenge nicht korrekt ist oder dass gar kein Kraftstoff eingespritzt wird. Abweichungen des tatsächlichen Drucks vom gemessenen Druck müssen daher ermittelt und korrigiert werden.This requires a correct functioning of the pressure sensor S. Inaccuracies, aging processes or malfunctions of the pressure sensor S can lead to the fuel quantity injected by the injection valve 11 being incorrect or not occurring at all Fuel is injected. Deviations of the actual pressure from the measured pressure must therefore be determined and corrected.

Eine in Figur 2a dargestellte Kennlinie 25 zeigt beispielhaft den Einspritzvorgang. Die Ordinate gibt dabei den Öffnungszustand des Einspritzventils 11 und damit die Einspritzrate wieder und die Abszisse den Zeitablauf. Eine in Figur 2b dargestellte Kennlinie 27 zeigt den Druckverlauf im Kraftstoffspeicher 9, der sich gleichzeitig zu dem in Figur 2a dargestellten Einspritzvorgang ergibt. Dabei stellt die Ordinate den aktuellen Druck im Kraftstoffspeicher 9 und die Abszisse die Zeit dar. Figur 2b zeigt zudem zwei Messzeitpunkte 29 und 31, die jeweils einen Beobachtungszeitpunkt darstellen, zu dem der getaktet gemessene Druck erfasst wird. Der Messzeitpunkt 29 repräsentiert die Erfassung des stationären Drucks p1 vor Beginn des Einspritzvorgangs, der Messzeitpunkt 31 den gemessenen Druck p1 nach der Einspritzung. Es ist anhand der Kennlinie 27 in Figur 2b erkennbar, dass der Druck p1 im Rahmen des in Figur 2a dargestellten Einspritzvorgangs abnimmt.An in FIG. 2a illustrated characteristic 25 shows an example of the injection process. The ordinate indicates the opening state of the injection valve 11 and thus the injection rate and the abscissa the time. An in FIG. 2b characteristic curve 27 shows the pressure curve in the fuel accumulator 9, which at the same time to the in FIG. 2a shown injection process results. The ordinate represents the current pressure in the fuel accumulator 9 and the abscissa represents the time. FIG. 2b also shows two measurement times 29 and 31, each representing an observation time at which the clocked measured pressure is detected. The measuring time 29 represents the detection of the steady-state pressure p1 before the beginning of the injection process, the measuring time 31 the measured pressure p1 after the injection. It is based on the characteristic 27 in FIG. 2b recognizable that the pressure p1 in the context of in FIG. 2a decreases injection process shown decreases.

Figur 3 zeigt ein Blockschaltbild der erfindungsgemäßen Lösung zur Überprüfung des Signals des Drucksensors S. Der vom Drucksensor S erfasste Druck p1 im Kraftstoffspeicher 9 wird kontinuierlich getaktet gemessen und das Messsignal dem Steuergerät D zugeleitet. Das Steuergerät D ermittelt aus der Druckdifferenz im Kraftstoffspeicher zu Beginn und am Ende des Einspritzvorgangs den Differenzwert, der einem realen Druckabfall Δp2 entspricht. Außerdem wird das Drucksignal p1 zusammen mit einem Signal Q, welches die Einspritzmenge wiedergibt, einer Modellierung M zugeführt. Die Modellierung M ermittelt auf der Basis des zu Beginn des Einspritzvorgangs stationär eingeregelten Drucks p1 und der Einspritzmenge Q durch eine rechnerische Nachbildung des Einspritzvorgangs eine Soll-Druckdifferenz Δp1, die dem realen Druckabfall Δp2 im Kraftstoffspeicher 9 aufgrund eines solchen Einspritzvorgangs entspricht. Aus den beiden Druckdifferenzen Δp1 und Δp2 wird ein Differenzsignal e erzeugt, welches Auskunft darüber gibt, ob und inwieweit eine Abweichung der durch Abtasten gemessenen, realen Druckdifferenz Δp2 von der mittels der Modellierung M ermittelten Soll-Druckdifferenz Δp1 vorliegt. Zum Beispiel kann aufgrund einer entsprechend hohen Abweichung auf einen Fehler geschlossen werden. FIG. 3 shows a block diagram of the inventive solution for checking the signal of the pressure sensor S. The detected by the pressure sensor S pressure p1 in the fuel reservoir 9 is measured continuously clocked and fed the measurement signal to the control unit D. The control unit D determines from the pressure difference in the fuel storage at the beginning and at the end of the injection process, the difference value corresponding to a real pressure drop Δp2. In addition, the pressure signal p1 is supplied to a modeling M together with a signal Q representing the injection quantity. The modeling M determines a target pressure difference Δp1, which corresponds to the real pressure drop Δp2 in the fuel accumulator 9 due to such an injection process, on the basis of the pressure p1 and the injection quantity Q, which are adjusted in a stationary manner at the beginning of the injection process, by a mathematical simulation of the injection process. From the two pressure differences .DELTA.p1 and .DELTA.p2, a difference signal e is generated, which provides information on whether and to what extent a deviation of the measured by sampling, real pressure difference .DELTA.p2 of the determined by means of modeling M target pressure difference .DELTA.p1 is present. For example, due to a correspondingly high deviation, an error can be deduced.

Die Erfindung ermöglicht es somit, den Druckverlauf aufgrund eines bekannten stationär eingeregelten Einspritzdrucks und einer bekannten Einspritzmenge zu beobachten und zu überwachen, wobei insbesondere kein weiterer Drucksensor und keine zusätzlichen Funktionsgrößen zur gesetzeskonformen Überprüfung erforderlich sind.The invention thus makes it possible to observe and monitor the pressure profile due to a known stationary adjusted injection pressure and a known injection quantity, wherein in particular no further pressure sensor and no additional function variables for legally compliant checking are required.

Claims (6)

Verfahren zur Überprüfung eines Drucksensors (S) einer Kraftstoffeinspritzeinrichtung, insbesondere eines Kraftfahrzeugs, wobei die Kraftstoffeinspritzeinrichtung einen Druckspeicher (9) aufweist, dem der Drucksensor (S) und ein Einspritzventil (11) zugeordnet ist, wobei bei dem Verfahren eine Kraftstoffmenge (Q) unter einem Druck (p1) von dem Einspritzventil (11) eingespritzt wird, dadurch gekennzeichnet, dass eine Druckdifferenz (Δp1), die durch einen Druckeinbruch auf Grund des Einspritzvorgangs entsteht, in Abhängigkeit von dem Druck (p1) und der Kraftstoffmenge (Q) ermittelt wird.A method for checking a pressure sensor (S) of a fuel injection device, in particular of a motor vehicle, wherein the fuel injection device has a pressure accumulator (9) to which the pressure sensor (S) and an injection valve (11) is assigned, wherein in the method a fuel quantity (Q) below a pressure (p1) is injected from the injection valve (11), characterized in that a pressure difference (Δp1), which results from a pressure drop due to the injection process, in dependence on the pressure (p1) and the fuel quantity (Q) is determined , Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Druckdifferenz (Δp1) mit einer durch Messung des Drucks (p1), insbesondere durch ein Abtasten des Drucks (p1), erfassten Druckdifferenz (Δp2) verglichen und in Abhängigkeit davon der Drucksensor (S) beurteilt wird.Method according to Claim 1, characterized in that the pressure difference (Δp1) is compared with a pressure difference (Δp2) detected by measuring the pressure (p1), in particular by sensing the pressure (p1), and the pressure sensor (S) is evaluated as a function thereof becomes. Vorrichtung zur Überprüfung eines Drucksensors (S) einer Kraftstoffeinspritzeinrichtung, insbesondere eines Kraftfahrzeugs, wobei die Kraftstoffeinspritzeinrichtung einen Druckspeicher (9) aufweist, dem der Drucksensor (S) und ein Einspritzventil (11) zugeordnet ist, wobei eine Kraftstoffmenge (Q) unter einem Druck (p1) von dem Einspritzventil (11) einspritzbar ist, dadurch gekennzeichnet, dass das System Mittel zur Ermittlung einer Druckdifferenz (Δp1), die durch einen Druckeinbruch auf Grund des Einspritzvorgangs entsteht, in Abhängigkeit von dem Druck (p1) und der Kraftstoffmenge (Q) aufweist.Device for checking a pressure sensor (S) of a fuel injection device, in particular of a motor vehicle, wherein the fuel injection device has a pressure accumulator (9) to which the pressure sensor (S) and an injection valve (11) are assigned, wherein a fuel quantity (Q) is below a pressure ( p1) can be injected by the injection valve (11), characterized in that the system comprises means for determining a pressure difference (Δp1) arising from a pressure drop due to the injection process as a function of the pressure (p1) and the fuel quantity (Q) having. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass das System Mittel zum Vergleichen der Druckdifferenz (Δp1) mit einer durch Messung des Drucks (p1), insbesondere durch ein Abtasten des Drucks (p1), erfassten Druckdifferenz (Δp2) und Mittel zur Beurteilung des Drucksensors (S) in Abhängigkeit von dem Vergleich aufweist.Device according to claim 3, characterized in that the system comprises means for comparing the pressure difference (Δp1) with a pressure difference (Δp2) detected by measuring the pressure (p1), in particular by sensing the pressure (p1), and means for evaluating the pressure sensor (S) depending on the comparison. Vorrichtung nach einem der Ansprüche 3 bis 4, dadurch gekennzeichnet, dass die Mittel ein elektrisches Steuergerät (D) umfassen.Device according to one of claims 3 to 4, characterized in that the means comprise an electrical control device (D). Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Mittel ein Computerprogramm umfassen, das auf einem Rechengerät, insbesondere einem Prozessor, ablauffähig ist.Device according to one of claims 3 to 5, characterized in that the means comprise a computer program which is executable on a computing device, in particular a processor.
EP09170017.9A 2008-11-10 2009-09-11 Method and device for testing a pressure sensor of a fuel injection device Withdrawn EP2184473A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008043592A DE102008043592A1 (en) 2008-11-10 2008-11-10 Method and device for checking a pressure sensor of a fuel injection device

Publications (2)

Publication Number Publication Date
EP2184473A2 true EP2184473A2 (en) 2010-05-12
EP2184473A3 EP2184473A3 (en) 2014-01-29

Family

ID=41560384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09170017.9A Withdrawn EP2184473A3 (en) 2008-11-10 2009-09-11 Method and device for testing a pressure sensor of a fuel injection device

Country Status (3)

Country Link
US (1) US20100121600A1 (en)
EP (1) EP2184473A3 (en)
DE (1) DE102008043592A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016155986A1 (en) * 2015-04-01 2016-10-06 Robert Bosch Gmbh Method and device for determining a correction value for a fuel injection amount

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028900B4 (en) * 2007-06-22 2013-06-27 Continental Automotive Gmbh Method and device for diagnosing an injection valve of an internal combustion engine that is in communication with a fuel rail
JP5182337B2 (en) * 2010-08-18 2013-04-17 株式会社デンソー Detection deviation judgment device of fuel pressure sensor
US9200975B2 (en) * 2011-11-15 2015-12-01 GM Global Technology Operations LLC Pressure diagnostic system and method
DE102012218176A1 (en) 2012-10-05 2014-04-10 Robert Bosch Gmbh Method for operating a fuel injection system
DE102017208080A1 (en) * 2017-05-12 2018-04-12 Continental Automotive Gmbh Method for operating a high-pressure fuel system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH112148A (en) * 1997-06-11 1999-01-06 Toyota Motor Corp Operation controller for internal combustion engine
DE19757655A1 (en) * 1997-12-23 1999-08-26 Siemens Ag Method and device for monitoring the function of a pressure sensor
EP1526269A2 (en) * 2003-10-20 2005-04-27 Siemens Aktiengesellschaft Method and device for monitoring a fuel pressure sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028891A1 (en) 2004-06-15 2006-01-05 Robert Bosch Gmbh Method for running of internal combustion engine of especially motor vehicle entails determining difference signal which represents deviation of pressure measured by pressure sensor from specific pressure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH112148A (en) * 1997-06-11 1999-01-06 Toyota Motor Corp Operation controller for internal combustion engine
DE19757655A1 (en) * 1997-12-23 1999-08-26 Siemens Ag Method and device for monitoring the function of a pressure sensor
EP1526269A2 (en) * 2003-10-20 2005-04-27 Siemens Aktiengesellschaft Method and device for monitoring a fuel pressure sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016155986A1 (en) * 2015-04-01 2016-10-06 Robert Bosch Gmbh Method and device for determining a correction value for a fuel injection amount
US10378474B2 (en) 2015-04-01 2019-08-13 Robert Bosch Gmbh Method and device for ascertaining a correction value for a fuel injection quantity

Also Published As

Publication number Publication date
EP2184473A3 (en) 2014-01-29
DE102008043592A1 (en) 2010-05-12
US20100121600A1 (en) 2010-05-13

Similar Documents

Publication Publication Date Title
EP1711704B1 (en) Method for monitoring the operability of a fuel injection system
EP1809884B1 (en) Device and method for correction of the injection behaviour of an injector
EP1815120B1 (en) Method and device for leak testing a fuel injecting valve for an internal combustion engine
EP0811116B1 (en) Process and device for monitoring a fuel metering system of an internal combustion engine
EP1573188B1 (en) Device and method for identifying defects in a fuel injection system
DE102013216255B3 (en) Method for injector-specific diagnosis of a fuel injection device and internal combustion engine with a fuel injection device
EP2184473A2 (en) Method and device for testing a pressure sensor of a fuel injection device
WO2011054633A1 (en) Method and device for monitoring a high-pressure fuel system
DE102016211551A1 (en) Method for determining a correction value for a fuel metering of a fuel injector
EP2670965A1 (en) Method for determining a control volume of an injector
DE102007057311B3 (en) Method and device for fault detection in emission-relevant control devices in a vehicle
EP3234328B1 (en) Method and apparatus for diagnosing a fuel supply system
DE102008024545A1 (en) Method for determining cause of defect in low pressure area of fuel injection system of internal combustion engine of motor vehicle, involves determining actual cause of defect by monitoring reaction of injection system to load step
DE10309720A1 (en) Motor vehicle internal combustion engine fuel injection control uses fuel feed measurement at injector with pressure variations compared to stored values
EP2029875B1 (en) Method of testing the functioning of a component of a fuel injection system
DE102016200991A1 (en) Method for fault diagnosis for the pressure sensor and common rail fuel injection control device
DE102017200482A1 (en) METHOD AND DEVICE FOR DETECTING AND CHARACTERIZING FUEL LEAKAGE AND VEHICLE
DE102017222559B4 (en) Method and device for predicting the point in time of failure of the pressure relief valve of a high-pressure fuel pump of a motor vehicle
DE10031066C2 (en) Injection system for an internal combustion engine and method for operating an injection system
DE102006015968B3 (en) Adaptation method and adaptation device of an injection system of an internal combustion engine
DE102005028137A1 (en) Fuel injection quantity measuring method for internal combustion engine in motor vehicle, involves comparing pressure drop rates of valves in built-in condition, or with absolute threshold value for determining quantity of valves
DE102013210909A1 (en) Method for checking the plausibility of a rail pressure sensor
DE102010027677B4 (en) A method for detecting a malfunction in the low-pressure system of an electronically controlled fuel injection system of an internal combustion engine by evaluating a stimulated pressure behavior
EP3642472B1 (en) Device and method for return pressure adjustment for an injector
WO2018215181A1 (en) Method for monitoring a cylinder pressure sensor

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

RIC1 Information provided on ipc code assigned before grant

Ipc: F02D 41/22 20060101AFI20131220BHEP

Ipc: F02D 41/38 20060101ALI20131220BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140730