EP2184473A2 - Procédé et dispositif de vérification d'un capteur de pression d'un dispositif d'injection de carburant - Google Patents

Procédé et dispositif de vérification d'un capteur de pression d'un dispositif d'injection de carburant Download PDF

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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Withdrawn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)
English (en)
Other versions
EP2184473A3 (fr
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/fr
Publication of EP2184473A3 publication Critical patent/EP2184473A3/fr
Withdrawn legal-status Critical Current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
    • 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)
  • Fuel-Injection Apparatus (AREA)
  • Measuring Fluid Pressure (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP09170017.9A 2008-11-10 2009-09-11 Procédé et dispositif de vérification d'un capteur de pression d'un dispositif d'injection de carburant Withdrawn EP2184473A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008043592A DE102008043592A1 (de) 2008-11-10 2008-11-10 Verfahren und Vorrichtung zur Überprüfung eines Drucksensors einer Kraftstoffeinspritzeinrichtung

Publications (2)

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

Family

ID=41560384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09170017.9A Withdrawn EP2184473A3 (fr) 2008-11-10 2009-09-11 Procédé et dispositif de vérification d'un capteur de pression d'un dispositif d'injection de carburant

Country Status (3)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016155986A1 (fr) * 2015-04-01 2016-10-06 Robert Bosch Gmbh Procédé et dispositif de détermination d'une valeur de correction pour un ensemble d'injection de carburant

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028900B4 (de) * 2007-06-22 2013-06-27 Continental Automotive Gmbh Verfahren und Vorrichtung zur Diagnose eines mit einer Kraftstoffverteilerleiste in Verbindung stehenden Einspritzventils einer Brennkraftmaschine
JP5182337B2 (ja) * 2010-08-18 2013-04-17 株式会社デンソー 燃圧センサの検出ずれ判定装置
US9200975B2 (en) * 2011-11-15 2015-12-01 GM Global Technology Operations LLC Pressure diagnostic system and method
DE102012218176A1 (de) 2012-10-05 2014-04-10 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzsystems
DE102017208080A1 (de) * 2017-05-12 2018-04-12 Continental Automotive Gmbh Verfahren zum Betreiben eines Kraftstoffhochdrucksystems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH112148A (ja) * 1997-06-11 1999-01-06 Toyota Motor Corp 内燃機関の運転制御装置
DE19757655A1 (de) * 1997-12-23 1999-08-26 Siemens Ag Verfahren und Vorrichtung zur Funktionsüberwachung eines Drucksensors
EP1526269A2 (fr) * 2003-10-20 2005-04-27 Siemens Aktiengesellschaft Méthode et dispositif de surveillance d'un capteur de pression de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028891A1 (de) 2004-06-15 2006-01-05 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH112148A (ja) * 1997-06-11 1999-01-06 Toyota Motor Corp 内燃機関の運転制御装置
DE19757655A1 (de) * 1997-12-23 1999-08-26 Siemens Ag Verfahren und Vorrichtung zur Funktionsüberwachung eines Drucksensors
EP1526269A2 (fr) * 2003-10-20 2005-04-27 Siemens Aktiengesellschaft Méthode et dispositif de surveillance d'un capteur de pression de carburant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016155986A1 (fr) * 2015-04-01 2016-10-06 Robert Bosch Gmbh Procédé et dispositif de détermination d'une valeur de correction pour un ensemble d'injection de carburant
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
US20100121600A1 (en) 2010-05-13
EP2184473A3 (fr) 2014-01-29
DE102008043592A1 (de) 2010-05-12

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