EP0668966B1 - Verfahren zur feststellung von störungen im hochdruckkreis eines hochdruck-kraftstoffeinspritz-systems einer brennkraftmaschine - Google Patents

Verfahren zur feststellung von störungen im hochdruckkreis eines hochdruck-kraftstoffeinspritz-systems einer brennkraftmaschine Download PDF

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Publication number
EP0668966B1
EP0668966B1 EP94927543A EP94927543A EP0668966B1 EP 0668966 B1 EP0668966 B1 EP 0668966B1 EP 94927543 A EP94927543 A EP 94927543A EP 94927543 A EP94927543 A EP 94927543A EP 0668966 B1 EP0668966 B1 EP 0668966B1
Authority
EP
European Patent Office
Prior art keywords
pressure
duty cycle
value
control cycles
pump
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 - Lifetime
Application number
EP94927543A
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English (en)
French (fr)
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EP0668966A1 (de
Inventor
Paolo Tubetti
Riccardo Buratti
Stefano Maria Borrione
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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Filing date
Publication date
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Publication of EP0668966A1 publication Critical patent/EP0668966A1/de
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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
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
    • 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
    • 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
    • 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
    • F02D2041/228—Warning displays
    • 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
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems

Definitions

  • the present invention relates to a method of diagnosing malfunctioning of the high-pressure circuit of internal combustion engine high-pressure injection systems.
  • the EP-A-501 459 describes a high-pressure injection system.
  • This system comprises a fuel tank, and a high-pressure injector supply circuit in turn comprising several pumps for supplying fuel at high pressure to a manifold in turn supplying a number of injectors.
  • the pump presents a pressure regulating solenoid valve for supplying fuel at a predetermined pressure.
  • a device serves to detect whether or not at least one of the pumps fails. Failure is detected when the pressure quantity patterns do not conform to a predetermined pattern.
  • the US-A-5 241 933 describes a high-pressure injection system. This document proposes the use of upper and lower pressure values for determining malfunction of the system. The upper and lower pressure values depend on the engine speed.
  • the FR-A-2 672 640 propose the use of upper and lower values for the control quantity for determining malfunction of a high pressure fuel supply system.
  • a method of diagnosing malfunctioning of the high-pressure circuit of internal combustion engine high-pressure injection systems comprising a high-pressure pump for supplying fuel at a pressure value controlled by means of control cycles; characterized in that it comprises the- steps of monitoring quantities correlated to the pressure generated by said pump in successive control cycles; comparing the pattern of said quantities in said successive control cycles with reference values; and generating fault signals in the event said pattern fails to present a predetermined relationship with said reference values.
  • FIG. 1 A general description will now be given, with reference to Figure 1, of a high-pressure injection system for internal combustion engines.
  • the system indicated by 1, comprises a tank 2 at atmospheric pressure, connected by a delivery line 5 to a radial-piston pump 6 presenting a pressure regulating solenoid valve (or pressure regulator) 7 connected by drain line 8 to tank 2.
  • a solenoid valve or pressure regulator
  • Manifold 10 feeds the fuel at high pressure along line 11 to a manifold 10 which provides for distributing the fuel to the injectors and damping any fluctuation in pressure caused by the action of the pump and opening of the injectors.
  • Manifold 10 consists of a steel body preferably in the form of a parallelepipedon and in which is formed a cylindrical cavity extending along the length of the manifold and connected to line 11 by a central hole 12.
  • Manifold 10 also presents four holes 13 spaced along the length of the manifold and connected to four high-pressure (up to 1500 bar) supply conduits 14 of four injectors 15 of an engine 16. Each injector 15 is also connected to a conduit 17 for recirculating the fuel (for operating the injector) into tank 2.
  • Manifold 10 is fitted at one end with a known pressure sensor 18.
  • Pressure regulator 7 is conveniently formed as shown in Figure 2, and comprises a body 20 defining a conical seat 21 for a spherical shutter 22.
  • shutter 22 is subjected to the combined force of a spring 24 and a solenoid 25 which cooperates with a core 26 integral with a rod 27 in -turn integral with push rod 23.
  • Shutter 22 separates an inlet conduit 28, connected to the body of pump 6, from an outlet conduit 29, connected to line 8; and varying the current supply to solenoid 25 regulates the force exerted on shutter 22 in the closing direction and, hence, the output pressure of pump 6.
  • Pressure is regulated by supplying solenoid 25 with a current whose duty cycle is modulated at a fixed oscillation frequency (PWM - Pulse Width Modulation - technique) and using a closed regulating loop which takes into account the actual pressure measured by pressure sensor 18, and the desired pressure value.
  • PWM Pulse Width Modulation - technique
  • the method according to the present invention provides for periodically checking operation of the system 1 components, and more specifically for determining: the ability of pump 6 to generate the required pressure; correct tightness of regulator 7; the absence of leakage in the circuit; the presence of injectors locked in the open position; correct operation of the electric circuit controlling regulator 7; and the sensitivity and correct operation of pressure sensor 18.
  • the maximum measured pressure test (block 30) consists in determining the pressure measured by sensor 18 in manifold 10 does not exceed a maximum permissible externally set value, e.g. 1600 bar, in a predetermined number of consecutive checks (e.g. five).
  • a pressure in excess of the maximum permissible value indicates the following types of fault: a shift in the setting of sensor 18 (measuring error); or regulator 7 locked in the closed position (a fault on the regulator preventing or greatly reducing pressurized fuel flow from conduit 28 to conduit 29 of regulator 7).
  • the minimum measured pressure test (block 31) consists in determining the measured pressure does not fall below a minimum permissible value in a predetermined number of consecutive checks, e.g. five.
  • the minimum permissible value varies according to engine speed, as shown by curve-B in Figure 4; and a pressure below the minimum permissible value indicates the following types of fault: an injector locked in the open position; a fault on the pump (fails to ensure the required fuel flow); leakage in the circuit; or a shift in the sensor setting.
  • the increase in the minimum permissible value alongside engine speed is important for detecting the presence of an injector locked in the open position, in that, at high engine speed, even with an injector locked in the open position, pressure may fail to fall below values which are acceptable and correspond to efficient operation at low engine speed.
  • Testing of the duty cycle controlling the pressure regulator consists in determining the duty cycle (percentage measurement) does not exceed a predetermined maximum value K2 (e.g. 97%) or fall below a predetermined minimum value K1 (e.g. 2%) in a predetermined number of consecutive checks (e.g. five for the maximum and 25 for the minimum value).
  • a duty cycle repeatedly in excess of the maximum value means the measured pressure in this period is permanently below the reference value of the system controlling the regulator, and indicates the same faults as the minimum pressure test as well as, possibly, malfunctioning of the electric circuit regulating the duty cycle.
  • a repeatedly low duty cycle value means the measured pressure is permanently in excess of the reference value of the system controlling the regulator, and indicates a shift in the setting of sensor 18 or overtightness of regulator 7.
  • Figures 5A, 5B and 5C show the pressure curve (dotted line) and duty cycle curve (continuous line) in three different conditions following locking of the injector at cycle 2 of the engine. More specifically, Figure 5A relates to a high-pressure condition, in which case, the fault is detected on the basis of the duty cycle remaining repeatedly in excess of the predetermined limit; Figure 5B relates to a medium-pressure condition, in which case, the fault is again detected on the basis of the excessively high duty cycle value, though more slowly than in Figure 5A; and Figure 5C relates to a low-pressure condition, in which case, the fault is detected by detecting too low a pressure value a given number of times.
  • the measured pressure/duty cycle congruency test exploits the relationship between the duty cycle (or more specifically the effective current supplied to regulator 7) and the pressure measured in manifold 10, which relationship is as shown by curve C in Figure 6 which shows reference pressure PR as a function of effective current. Since curve C varies within certain limits according to the regulator used, reference value PR is assigned an upper and lower tolerance value T (e.g. 300 bar) to give two curves D1, D2 defining a given acceptance range.
  • T e.g. 300 bar
  • the congruency test consists in determining the duty cycle value of the current supply to solenoid valve 7 according to conveniently proportional-integral algorithms and as a function of actual measured pressure and required pressure (the latter calculated as provided for, e.g. on the basis of engine parameters as described in a further patent application filed by the present Applicant).
  • the reference value PR corresponding to the determined duty cycle is determined; and a check is made to determine whether the value of the pressure measured by sensor 18 corresponds to reference value PR within the given tolerance (i.e. whether the measured pressure value falls within the given tolerance range).
  • a pressure value outside the given range in a given number of consecutive checks substantially indicates a shift in the setting of sensor 18 in that, the congruency test being slower than the others, other types of fault are generally detected earlier.
  • the method described thus provides, in a straightforward, reliable manner, for indicating otherwise undetectable faults in the hydraulic circuit - such as locking of an injector in the open position - by detecting extraneous factors unrelated to faults resulting in a transient variation in circuit control quantities.

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

Claims (7)

  1. Verfahren zur Feststellung von Störungen im Hochdruckkreis eins Hochdruckkraftstoffeinspritzsystems einer Brennkraftmaschine, wobei der Hochdruckkreis eine Hochdruckpumpe (6) zur Bereitstellung von Kraftstoff unter hohem Druck umfaßt, der in Regelzyklen geregelt wird, wobei das Verfahren die folgenden Schritt umfaßt:
    Überwachung einer Größe, die den Druck charakterisiert, der von der Hochdruckpumpe (6) in aufeinanderfolgenden Regelzyklen gebildet wird,
    Vergleichen des Verhaltens dieser Größe in aufeinanderfolgenden Regelzyklen mit Referenzwerten, Erzeugen eines Fehlersignals, wenn das Verhalten der Größe nicht in einem vorgegebenen Verhältnis zu dem Referenzwert steht,
    daß das Tastverhältnis des Stromes, mit dem das Regelventil (7) versorgt wird verändert wird,
    Messung des von der Hochdruckpumpe erzeugten Drucks, Berechnung des Tastverhältnises des Stromes auf der Basis der Abweichung zwischen dem Sollwert des Druckes und dem gemessenen Druck,
    Bestimmung eines Referenzdruckes auf Grundlage des Tastverhältnises,
    Vergleichen des gemessenen Druckes und des Referenzdruckes und Erzeugen eines Fehlersignales, wenn der gemessene Druck in einer vorgegebenen Anzahl von aufeinanderfolgenden Regelzyklen um mehr als ein Toleranzband von dem Referenzdruck abweicht.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Referenzdruck aus einem Kennfeld, in dem der Druckwert als Funktion des Tastverhältnises gespeichert ist, ausgelesen wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Druck, der von der Hochdruckpumpe (6) in einem Speicher (10) bereitgestellt wird, gemessen und der gemessene Druck mit einem maximalen Referenzdruck verglichen wird, und ein Fehlersignal gebildet wird, wenn der gemessene Druck den maximalen Referenzdruck in einer vorgegebenen Anzahl von aufeinanderfolgenden Regelzyklen überschreitet.
  4. Verfahren nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß der gemessene Druck mit einem minimalen Referenzdruck verglichen wird und daß ein Fehlersignal erzeugt wird, wenn der gemessene Druck den minimalen Referenzdruck in einer vorgegebenen Anzahl von aufeinanderfolgenden Regelzyklen unterschreitet.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der minimale Referenzdruck abhängig von der Drehzahl der Brennkraftmaschine vorgebbar ist.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Regelzyklen den Schritt umfaßt, daß das Tastverhältnis des Stroms, mit dem das Regelventil (7) der Hochdruckpumpe (6) versorgt wird, verändert wird, dadurch gekennzeichnet, daß der von der Hochdruckpumpe erzeugte Druck gemessen wird, daß das Tastverhältnisses des Stroms auf der Basis der Abweichung zwischen dem Sollwert des Druckes und dem gemessenen Druckes berechnet wird, das berechnete Tastverhältniss mit einem Minimalwert und einem Maximalwert verglichen wird, ein Fehlersignal erzeugt wird, wenn das Tastverhältnis in einer vorgegebenen Anzahl von aufeinanderfolgenden Regelzyklen nicht in ein Toleranzband fällt, das durch den Minimalwert und den Maximalwert definiert ist.
  7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Bestimmung des Referenzdruckes, der Referenzdruck aus einem Kennfeld ausgelesen wird, in dem Druckwert als Funktion des Tastverhältnisses abgespeichert ist.
EP94927543A 1993-09-03 1994-09-02 Verfahren zur feststellung von störungen im hochdruckkreis eines hochdruck-kraftstoffeinspritz-systems einer brennkraftmaschine Expired - Lifetime EP0668966B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITTO930646 1993-09-03
ITTO930646A IT1261575B (it) 1993-09-03 1993-09-03 Metodo di diagnosi di malfunzionamenti del circuito ad alta pressione di impianti di iniezione ad alta pressione per motori a combustione interna
PCT/EP1994/002922 WO1995006814A1 (en) 1993-09-03 1994-09-02 Method of diagnosing malfunctioning of the high-pressure circuit of internal combustion engine high-pressure injection systems

Publications (2)

Publication Number Publication Date
EP0668966A1 EP0668966A1 (de) 1995-08-30
EP0668966B1 true EP0668966B1 (de) 1998-03-25

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EP94927543A Expired - Lifetime EP0668966B1 (de) 1993-09-03 1994-09-02 Verfahren zur feststellung von störungen im hochdruckkreis eines hochdruck-kraftstoffeinspritz-systems einer brennkraftmaschine

Country Status (5)

Country Link
EP (1) EP0668966B1 (de)
JP (1) JP3727339B2 (de)
DE (1) DE69409222T2 (de)
IT (1) IT1261575B (de)
WO (1) WO1995006814A1 (de)

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WO2013089621A1 (en) * 2011-12-13 2013-06-20 Scania Cv Ab Device and method for fault detection in a fuel supply system of a motor vehicle
EP2791496A4 (de) * 2011-12-13 2015-12-02 Scania Cv Ab Vorrichtung und verfahren zur fehlererkennung in einem kraftstoffversorgungssystem eines kraftfahrzeugs

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DE19521791A1 (de) * 1995-06-15 1996-12-19 Daimler Benz Ag Verfahren zum Erkennen von Betriebsstörungen in einer Kraftstoffeinspritzanlage einer Brennkraftmaschine
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DE19548280A1 (de) * 1995-12-22 1997-06-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
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WO1997049909A1 (de) * 1996-06-26 1997-12-31 Robert Bosch Gmbh Verfahren zum betrieb einer kraftstoffeinspritzeinrichtung
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DE10031066C2 (de) * 2000-06-26 2002-05-02 Siemens Ag Einspritzanlage für eine Brennkraftmaschine sowie Verfahren zum Betrieb einer Einspritzanlage
IT1321068B1 (it) * 2000-11-14 2003-12-30 Fiat Ricerche Metodo di diagnosi di perdite in un impianto di iniezione a collettore comune di un motore a combustione interna.
DE10146474B4 (de) * 2001-09-21 2005-10-06 Robert Bosch Gmbh Verfahren und Vorrichtung zur Diagnose eines Druckdämpfers
DE10147189A1 (de) 2001-09-25 2003-04-24 Bosch Gmbh Robert Verfahren zum Betreiben eines Kraftstoffversorgungssystems für einen Verbrennungsmotor eines Kraftfahrzeugs
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DE10259797A1 (de) * 2002-12-19 2004-07-15 Siemens Ag Vorrichtung und Verfahren zum Erkennen von Fehlern in einem Kraftstoffeinspritzsystem
DE102004022115A1 (de) 2004-05-05 2005-11-24 Robert Bosch Gmbh Verfahren zum Einbringen eines Reagenzmittels in einen Abgaskanal einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens
DE102004037963A1 (de) 2004-08-05 2006-03-16 Robert Bosch Gmbh Prüfverfahren
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JP4746510B2 (ja) * 2006-02-21 2011-08-10 愛三工業株式会社 負荷駆動系の異常診断システムおよび燃料ポンプ制御システム
JP4591390B2 (ja) * 2006-03-27 2010-12-01 株式会社デンソー ポンプ故障診断装置
DE102008024955B3 (de) 2008-05-23 2009-12-24 Continental Automotive Gmbh Verfahren zur Erkennung einer Fehlfunktion eines Raildrucksensors bei einem Common Rail-Einspritzsystem
US8775052B2 (en) 2011-12-15 2014-07-08 GM Global Technology Operations LLC Sensors bias detection for electronic returnless fuel system
DE102016205481A1 (de) * 2016-04-04 2017-10-05 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Dichtheitsprüfung einer Kraftstoff-Hochdruck-Einspritzvorrichtung
DE102018217327B4 (de) * 2018-10-10 2023-10-12 Vitesco Technologies GmbH Verfahren und Vorrichtung zur Plausibilisierung der Funktionsfähigkeit eines Hochdrucksensors einer Hochdruckkraftstoffeinspritzvorrichtung eines Kraftfahrzeugs

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013089621A1 (en) * 2011-12-13 2013-06-20 Scania Cv Ab Device and method for fault detection in a fuel supply system of a motor vehicle
EP2791496A4 (de) * 2011-12-13 2015-12-02 Scania Cv Ab Vorrichtung und verfahren zur fehlererkennung in einem kraftstoffversorgungssystem eines kraftfahrzeugs

Also Published As

Publication number Publication date
ITTO930646A1 (it) 1995-03-03
IT1261575B (it) 1996-05-23
ITTO930646A0 (it) 1993-09-03
DE69409222D1 (de) 1998-04-30
WO1995006814A1 (en) 1995-03-09
JPH08503053A (ja) 1996-04-02
JP3727339B2 (ja) 2005-12-14
DE69409222T2 (de) 1998-07-16
EP0668966A1 (de) 1995-08-30

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