EP1926900B1 - Procede et dispositif de surveillance d'un systeme de dosage de carburant - Google Patents

Procede et dispositif de surveillance d'un systeme de dosage de carburant Download PDF

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Publication number
EP1926900B1
EP1926900B1 EP06793414.1A EP06793414A EP1926900B1 EP 1926900 B1 EP1926900 B1 EP 1926900B1 EP 06793414 A EP06793414 A EP 06793414A EP 1926900 B1 EP1926900 B1 EP 1926900B1
Authority
EP
European Patent Office
Prior art keywords
pressure
error
fuel
rail
exponent
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.)
Expired - Fee Related
Application number
EP06793414.1A
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German (de)
English (en)
Other versions
EP1926900A1 (fr
Inventor
Hans Georg Bossemeyer
Michael Hackner
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
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1926900A1 publication Critical patent/EP1926900A1/fr
Application granted granted Critical
Publication of EP1926900B1 publication Critical patent/EP1926900B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • 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
    • 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
    • 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
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/003—Measuring variation of fuel pressure in high pressure line
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1423—Identification of model or controller parameters
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection

Definitions

  • the invention is based on a method and a device for monitoring a Kraftstoffzumesssystems according to the preamble of the main claims.
  • From the DE 195 20 300 is a device for detecting a leak in a fuel supply system in an internal combustion engine, in particular a self-igniting internal combustion engine known.
  • the fuel is conveyed from at least one fuel pump under pressure from a fuel tank into a so-called high-pressure area.
  • injectors which are commonly referred to as injectors, enters the individual combustion chambers of the internal combustion engine.
  • the pressure in the high pressure region is detected by means of a pressure sensor.
  • This pressure sensor is usually used to adjust or regulate the pressure in the high pressure range.
  • the pressure is evaluated so that the pressure curve is detected and compared with an expected pressure curve. In the event of a deviation between an expected pressure curve and the actual pressure curve, the device detects a leak.
  • the EP 0974826 A2 describes a method for monitoring a fuel metering system, commonly referred to as a common rail system. Depending on the steepness of the pressure drop, a distinction is made between a large and a small leak. An assignment of the error to a component is not provided.
  • the DE 197 24 794 C1 describes a method and an apparatus for monitoring a common rail system. It is checked whether the pressure drop remains within a tolerance band by an expected value. If this is not the case, the device recognizes errors.
  • FIG. 12 shows a method that detects a defective component due to a deviation of the rail pressure from an expected value.
  • FIG. 1 In the FIG. 1 are exemplary essential elements of a Kraftstoffzumesssystems, in particular a diesel engine, shown.
  • 100 is the Internal combustion engine referred.
  • This fuel is supplied via a first injector 110 and a second injector 120.
  • the injectors 110 and 120 are connected via fuel lines with a rail 130 in connection.
  • At least one sensor 140 which emits a pressure variable p which characterizes the pressure in the high-pressure region, is arranged on the rail.
  • This print size is also referred to as rail pressure in the following.
  • other variables characterizing the rail pressure can be evaluated accordingly.
  • the rail 130 is acted upon by a high-pressure pump 150 with fuel.
  • This high pressure pump is associated with an actuating element 160, with which the amount of fuel delivered by the high pressure pump 150 and thus the rail pressure can be controlled.
  • This control element 160 and the injectors 110 and 120 are acted upon by a control unit 170 with drive signals.
  • the control unit also processes the output signal p of the sensor 140.
  • the rail and the line between the high-pressure pump 150 and the injectors as high-pressure region and the area before the high-pressure pump is referred to as low-pressure region.
  • the procedure is applicable to any number of injectors. For clarity, only two injectors are shown. It can also be provided more adjusting elements.
  • a further adjusting element can be provided by means of which the rail pressure can be controlled.
  • Such an actuating element is designed, for example, as a solenoid valve which connects the high-pressure region with the low-pressure region.
  • the control unit evaluates the signals of further sensors or controls further control elements for controlling the internal combustion engine 100.
  • the approach is not limited to systems with a rail. It can also be used on systems with multiple rails or even on systems without a rail. Instead of the rail pressure then a size corresponding to the rail pressure is evaluated.
  • the high-pressure pump 150 conveys the fuel from the low-pressure region, which in particular comprises the tank, into a high-pressure region, which in particular includes the rail 130.
  • the amount of fuel delivered and thus the rail pressure can be adjusted by means of the first control element 160.
  • this is done by a control that is part of the control unit 170.
  • the control unit 170 detects the rail pressure p via the sensor 140 and compares it with a desired value and controls the actuating element 160 as a function of the deviation between the setpoint and the actual value. From the high pressure region of the fuel passes through the injectors 110 and 120 in the internal combustion engine.
  • the injectors essentially include an actuator that can be designed as a solenoid valve or a piezoelectric actuator.
  • the control unit 170 acts on the Injectors 110 and 120 with such signals that the fuel is supplied at a predetermined time or to the predetermined angular position of the crankshaft of the internal combustion engine in a predetermined amount.
  • the pressure profile is evaluated and compared with different, in particular stored, pressure profiles.
  • the leakage is reliably detected and, on the other hand, the leakage is assigned to a specific component.
  • step 200 it is checked whether an operating state exists in which a check is possible. If this is not the case, query 200 takes place after a waiting time has elapsed. If query 200 recognizes that a check is possible, then in step 210 specific conditions are brought about which are necessary for the check. Thus, inter alia, in step 210, the high-pressure region is subjected to a test pressure. Furthermore, it is ensured by controlling the adjusting elements for regulating the rail pressure, in particular of the actuating element 160 and by controlling the injectors 110 and 120, that no further fuel is conveyed into the rail or removed from the rail. If additional actuators are provided, these must also be controlled accordingly.
  • step 220 the pressure curve over time or over the rotation of the crankshaft is then recorded. Subsequently, in step 230, the exponent of the pressure drop curve is determined.
  • the pressure-dependent leakage flow rates and pressure change rates have power functions to follow the pressure.
  • the pressure drop over time or over the angular position of the crankshaft approximately follows a so-called hyperbolic function with exponent.
  • the query 240 then checks which of these stored values the measured exponent comes closest to and assigns a stored value to the exponent.
  • the corresponding error can then be read from the table based on the stored exponent. In this case, usually a certain range of values of the exponent will be assigned to a type of error.
  • FIG. 3 For example, two curves of the rail pressure with and without pressure-dependent leakage gap widening over time are plotted. It can be seen from this figure that when the pressure value is monitored at a specific point in time t1, the pressure at different pressure curves has fallen to the same value. By means of an evaluation of the pressure at one or a few points in time, an assignment of the error to a component or a type of error is not always possible.

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

Claims (3)

  1. Procédé de surveillance d'un système de dosage de carburant, dans lequel du carburant est refoulé d'une zone basse pression à une zone haute pression, une grandeur de pression caractérisant la pression dans la zone haute pression étant détectée et, à partir de la courbe de la grandeur de pression, une erreur étant reconnue, caractérisé en ce qu'à partir de la courbe de la grandeur de pression, le type d'erreur est reconnu, la courbe de la grandeur de pression étant approximée en fonction du temps avec une fonction hyperbolique, une exponentielle de la fonction hyperbolique étant déterminée et, à partir de l'exponentielle de la fonction hyperbolique, le type d'erreur étant reconnu.
  2. Procédé selon la revendication 1, caractérisé en ce qu'à partir de la courbe de la grandeur de pression, le composant défectueux est reconnu.
  3. Dispositif de surveillance d'un système de dosage de carburant, dans lequel du carburant est refoulé d'une zone basse pression à une zone haute pression, comprenant des moyens qui détectent une grandeur de pression caractérisant la pression dans la zone haute pression et qui, à partir de la courbe de la grandeur de pression, reconnaissent une erreur, caractérisé en ce que des moyens sont prévus pour approximer la courbe de la grandeur de pression en fonction du temps par une fonction hyperbolique, pour déterminer une exponentielle de la fonction hyperbolique et, à partir de l'exponentielle de la fonction hyperbolique, reconnaître le type d'erreur.
EP06793414.1A 2005-09-15 2006-09-11 Procede et dispositif de surveillance d'un systeme de dosage de carburant Expired - Fee Related EP1926900B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005043971A DE102005043971A1 (de) 2005-09-15 2005-09-15 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumesssystems
PCT/EP2006/066234 WO2007031492A1 (fr) 2005-09-15 2006-09-11 Procede et dispositif de surveillance d'un systeme de dosage de carburant

Publications (2)

Publication Number Publication Date
EP1926900A1 EP1926900A1 (fr) 2008-06-04
EP1926900B1 true EP1926900B1 (fr) 2016-06-29

Family

ID=37487575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06793414.1A Expired - Fee Related EP1926900B1 (fr) 2005-09-15 2006-09-11 Procede et dispositif de surveillance d'un systeme de dosage de carburant

Country Status (7)

Country Link
US (1) US8191411B2 (fr)
EP (1) EP1926900B1 (fr)
JP (1) JP4646261B2 (fr)
KR (1) KR101046825B1 (fr)
CN (1) CN101263291B (fr)
DE (1) DE102005043971A1 (fr)
WO (1) WO2007031492A1 (fr)

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ITTO20070128A1 (it) * 2007-02-23 2008-08-24 Derossi Massimo S R L Apparato di diagnosi multiuso per un motore a iniezione diretta benzina o diesel, preferibilmente con tecnologia a collettore comune (common rail).
DE102009002619A1 (de) 2009-04-24 2010-10-28 Robert Bosch Gmbh Verfahren zur Überwachung eines Druckspeichers
CN101598073A (zh) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 一种油轨压力信号的采集及监测方法
EP2333290B1 (fr) * 2009-12-14 2013-05-15 Volvo Car Corporation Procédé et système pour détecter une fuite dans un réservoir de carburant de véhicule
DE102010013602B4 (de) * 2010-03-31 2015-09-17 Continental Automotive Gmbh Verfahren zur Erkennung eines Fehlverhaltens eines elektronisch geregelten Kraftstoffeinspritzsystems eines Verbrennungsmotors
DE102012208465A1 (de) 2012-05-21 2013-11-21 Robert Bosch Gmbh Kraftstoffeinspritzsystem mit einer hochdruckfesten Drosselvorrichtung zur Einstellung der Durchflussmenge und der Strömungsform
US20140238352A1 (en) * 2013-02-22 2014-08-28 Caterpillar, Inc. Fault Diagnostic Strategy For Common Rail Fuel System
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DE102017200482B4 (de) * 2017-01-13 2022-08-18 Bayerische Motoren Werke Aktiengesellschaft Verfahren und vorrichtung zur detektion und charakterisierung von kraftstoffleckage sowie fahrzeug
DE102021201907A1 (de) 2021-03-01 2022-09-01 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Erkennen einer Leckage in einem Hochdruckbereich eines Kraftstoffversorgungssystems

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Also Published As

Publication number Publication date
KR101046825B1 (ko) 2011-07-06
DE102005043971A1 (de) 2007-03-22
US8191411B2 (en) 2012-06-05
KR20080055832A (ko) 2008-06-19
CN101263291A (zh) 2008-09-10
WO2007031492A1 (fr) 2007-03-22
EP1926900A1 (fr) 2008-06-04
JP2009508054A (ja) 2009-02-26
CN101263291B (zh) 2012-04-25
US20090199627A1 (en) 2009-08-13
JP4646261B2 (ja) 2011-03-09

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