EP0976921B1 - Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumesssystems - Google Patents

Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumesssystems Download PDF

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Publication number
EP0976921B1
EP0976921B1 EP99103561A EP99103561A EP0976921B1 EP 0976921 B1 EP0976921 B1 EP 0976921B1 EP 99103561 A EP99103561 A EP 99103561A EP 99103561 A EP99103561 A EP 99103561A EP 0976921 B1 EP0976921 B1 EP 0976921B1
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EP
European Patent Office
Prior art keywords
pressure
change
pressure signal
signal
value
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
EP99103561A
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German (de)
English (en)
French (fr)
Other versions
EP0976921A2 (de
EP0976921A3 (de
Inventor
Christof Hammel
Juergen Biester
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 EP0976921A2 publication Critical patent/EP0976921A2/de
Publication of EP0976921A3 publication Critical patent/EP0976921A3/de
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Publication of EP0976921B1 publication Critical patent/EP0976921B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
    • 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
    • F02D2200/0604—Estimation of fuel pressure

Definitions

  • the invention relates to a method and a device to monitor a fuel metering system Internal combustion engine according to the generic terms of independent Expectations.
  • the pressure is in the range between a few 100 bar to approx. 2000 bar. Within this Range, the pressure sensor must reliably give a signal provide. A failure of the pressure sensor or a faulty signal from the pressure sensor leads to an inaccurate Fuel metering.
  • the invention is based, with one Method and a device of the type mentioned the accuracy of the fuel metering, especially the Improve detection of the pressure signal. This task will by those characterized in the independent claims Features solved.
  • the control signal for a pressure influencing Actuator is used particularly advantageously as a size, which affects the pressure, since this size is already in Control unit is present.
  • FIG. 1 shows a block diagram of a common rail system
  • Figure 2 a Characteristic curve of a pressure sensor
  • Figure 3 is a flow chart of the method according to the invention.
  • FIG. 1 is a common rail system as a block diagram shown.
  • a control is designated by 100.
  • This includes a pressure controller 101, which is a switching means 102 controlled and with the output signals of a Current measuring means 103 is applied.
  • the current control 101 also processes the output signal of a pressure sensor 110 and the output signals from further sensors 105 first input of switching means 102 is via the Current measuring means 103 connected to battery voltage.
  • the second connection of the switching means 102 is with a coil 115 in contact, the second input of which is connected to ground in Connection is established.
  • the other sensors 105 are sensors, the different operating states of the internal combustion engine and of the vehicle driven by the internal combustion engine to capture. This is for example the Speed N of the internal combustion engine and the accelerator pedal position, that identify the driver request.
  • the pressure sensor 110 detects the pressure in a memory 112, which is also called a rail, and which the High pressure area of the fuel metering system is assigned.
  • the rail 112 has various injectors 111 in Contact.
  • the rail 112 is connected via a high-pressure line 122 a high pressure pump 125 connected.
  • the high pressure line 122 is also via a pressure control valve 120 with a Return line 121 in contact.
  • the high pressure pump 125 is stopped with a prefeed pump 127 and a filter 129 with a Tank in connection. With the tank there is also Return line 121 in connection.
  • the pre-feed pump 127 pumps the fuel out of the tank via the filter 129 to high pressure pump 125.
  • This area is called Designated low pressure range.
  • the high pressure pump 125 delivers the fuel under high pressure over the High pressure line 122 in the rail 112.
  • the pressure in the rail 112 and thus in the high pressure area by means of the pressure sensor 110 detected and fed to the controller 100.
  • the controller 100 applies sensors to the injectors 111 with control signals that control the fuel metering.
  • the pressure in the High-pressure line 122 and thus in the rail 112 to predeterminable Values can be set.
  • the pressure control valve 120 is like this trained that it at a predetermined pressure in High pressure area the connection to the return line 121 releases and thus the pressure is reduced until it is below the predeterminable pressure value drops.
  • the pressure value at which the Pressure regulating valve 120 releases the connection by means of the coil 115 can be set. Depending on the current I, that flows through the coil 115 and / or that on the coil applied voltage, pose different Pressure values in the high pressure range.
  • the pressure can also be regulated by other actuators respectively. As an alternative or in addition, it can be provided that that the pressure is also influenced by the high pressure pump 125 controlled and / or regulated.
  • FIG. 2 An example of a sensor characteristic, the dependency of the Pressure P from the control signal of the pressure control valve 120 is shown in Figure 2.
  • the ideal characteristic is marked with a solid line.
  • the real Characteristic curve has a hysteresis and is one dotted line. Due to measurement errors an error may occur in the signal that leads to a dash-dotted line can lead.
  • the measured values are checked for plausibility in terms of whether this at a certain current value I1 these errors must be taken into account. This means that the value of the pressure P is between the value P + ⁇ P and the value P- ⁇ P in an allowable range.
  • the pressure sensor can be monitored in that two values P- ⁇ P and P + ⁇ P for the minimum and maximum possible value of pressure at a certain current value is specified. With these values the pressure P, which is from Sensor is measured, compared. If the exceeds measured value is below the value P + ⁇ P measured value the value P- ⁇ P is recognized by the device faulty pressure sensor. It is particularly advantageous if the values P + ⁇ P and P- ⁇ P depending on the operating point, in particular depending on the speed of the internal combustion engine become. A disadvantage of this procedure is that due to numerous tolerances the value range between the values P- ⁇ P and P + ⁇ P must be chosen very large in order to rule out a misdiagnosis.
  • control signal of the pressure control valve is increased by one changed defined value and the change in pressure detected. With this method only differential quantities are used considered, this reduces the overall tolerance considerably. Instead of the control signal for the Pressure regulating valve can also be other size, the pressure influence, be changed.
  • a Operating state in which the check is carried out can exists, for example, when the engine is in a static Operating state in which the Only slightly change operating parameters over time.
  • step 310 a first value for the pressure P1, which is present in the control signal I1 for the pressure control valve, is detected in step 310.
  • the control system specifies a second value I2 for the control signal and the pressure P2 is detected with this control signal.
  • Block 340 gives the setpoint PLC for the slope depending on various operating parameters, such as for example the control signal for the pressure control valve in front.
  • the query 350 checks whether the amount of the deviation between the measured slope SP and the setpoint SPS for the slope is greater than a first threshold S1. is if this is not the case, query 300 occurs again this is the case, that is, the slope softens more than one first threshold value S1 from the expected PLC, so recognizes setting up for errors.
  • a subsequent query 360 checks whether the amount of discrepancy between the measured slope SP and the setpoint SPS for the slope is greater than a second threshold value S2.
  • step 380 emergency operation is preferably initiated in this way. It If further measures can also be provided, then for example, an error memory is also set and / or Error display can be activated.
  • the query recognizes that the amount of deviation is smaller than the second threshold value, the drift becomes the Pressure signal out. This means in step 370 appropriate measures are initiated.
  • two threshold values S1 and S2 are provided, wherein when a first is exceeded Threshold a drift of the sensor and when exceeded of the second threshold value S2 a defect of the sensor is recognized , the second threshold being an amount assumes a larger value than the first threshold value.
  • Threshold value S1 provided.
  • the sensor characteristic is a so-called offset error having.
  • the pressure signal with an expected value is compared.
  • a faulty pressure signal detected is detected.
  • This review is done preferably in operating conditions in which the fuel is completely relaxed in the rail. This is for example in the Initialization phase of the control unit before and / or at Start, in the wake or in overrun the case. Further this check can be done when the pressure control valve so controlled that it opens completely. The one in this State-setting pressure is known.
  • the actuator that affects the pressure such controlled that the lowest possible pressure is established.
  • the control is preferably carried out in such a way that the pressure corresponds to atmospheric pressure.
  • the pressure signal takes values that are much larger than the expected value the device recognizes a so-called offset error.
  • US corresponds to the control signal that is actually required is to adjust the pressure P.
  • This dependency will approximated by a straight line through the slope SP and the offset UDS is defined.
  • the slope SP becomes as above described determined. This is used to determine the offset Actuator 120 controlled so that the pressure is the value Assumes zero.
  • the control signal required for this is used as offset value UDS.
  • the pressure P is calculated using the nominal sensor characteristic curve based on the control signal AND in accordance with the following relationship.
  • P (UKOR - UDN) / PLC

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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)
  • Fuel-Injection Apparatus (AREA)
EP99103561A 1998-07-31 1999-02-24 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumesssystems Expired - Lifetime EP0976921B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19834660A DE19834660A1 (de) 1998-07-31 1998-07-31 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems
DE19834660 1998-07-31

Publications (3)

Publication Number Publication Date
EP0976921A2 EP0976921A2 (de) 2000-02-02
EP0976921A3 EP0976921A3 (de) 2001-03-07
EP0976921B1 true EP0976921B1 (de) 2004-06-30

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EP99103561A Expired - Lifetime EP0976921B1 (de) 1998-07-31 1999-02-24 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumesssystems

Country Status (3)

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EP (1) EP0976921B1 (ja)
JP (1) JP4313901B2 (ja)
DE (2) DE19834660A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013017420B3 (de) * 2013-10-19 2015-02-19 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Verfahren zur Diagnose eines Kraftstoffdrucksensors beim Betrieb einer Brennkraftmaschine
DE102013021925B3 (de) * 2013-12-20 2015-05-28 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Verfahren zur Diagnose eines Kraftstoffdrucksensors beim Betrieb einer Verbrennungskraftmaschine

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DE10030935A1 (de) * 2000-06-24 2002-01-03 Bosch Gmbh Robert Verfahren und Vorrichtung zum Kalibrieren eines Drucksensors in einem Kraftstoffzumesssystem
DE10031066C2 (de) * 2000-06-26 2002-05-02 Siemens Ag Einspritzanlage für eine Brennkraftmaschine sowie Verfahren zum Betrieb einer Einspritzanlage
DE10036154B4 (de) * 2000-07-25 2015-11-26 Volkswagen Ag Verfahren zum Überprüfen eines Kraftstoffdruckregelsystems
DE10147189A1 (de) 2001-09-25 2003-04-24 Bosch Gmbh Robert Verfahren zum Betreiben eines Kraftstoffversorgungssystems für einen Verbrennungsmotor eines Kraftfahrzeugs
JP2003328835A (ja) * 2002-05-14 2003-11-19 Mitsubishi Electric Corp 内燃機関制御装置のための燃圧センサ装置
US6947831B2 (en) * 2003-04-11 2005-09-20 Ford Global Technologies, Llc Pressure sensor diagnosis via a computer
JP4659648B2 (ja) * 2006-03-08 2011-03-30 本田技研工業株式会社 燃料供給系の異常判定装置
DE102007014325B4 (de) 2007-03-26 2017-06-08 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überwachung eines Drucksignals, insbesondere eines Raildrucksignals eines Common-Rails-Systems
DE102008024955B3 (de) * 2008-05-23 2009-12-24 Continental Automotive Gmbh Verfahren zur Erkennung einer Fehlfunktion eines Raildrucksensors bei einem Common Rail-Einspritzsystem
DE102008024956B4 (de) * 2008-05-23 2011-02-10 Continental Automotive Gmbh Verfahren zur Überprüfung eines Drucksensors einer Kraftstoffspeichervorrichtung
US8091532B2 (en) * 2009-04-22 2012-01-10 GM Global Technology Operations LLC Diagnostic systems and methods for a pressure sensor during driving conditions
DE102010015382B4 (de) 2009-04-22 2018-12-27 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Diagnosesysteme und -verfahren für einen Drucksensor bei Leerlaufbedingungen
DE102009051023B4 (de) * 2009-10-28 2015-01-15 Audi Ag Verfahren zum Betreiben eines Antriebsaggregats sowie Antriebsaggregat
US8511275B2 (en) * 2010-10-01 2013-08-20 General Electric Company Method and system for a common rail fuel system
DE102011101825A1 (de) * 2011-05-17 2012-11-22 Daimler Ag Kraftfahrzeugmotorsteuervorrichtung
DE102013201576A1 (de) 2013-01-31 2014-07-31 Robert Bosch Gmbh Verfahren zur Plausibilisierung eines Raildrucksensor-Wertes
US20160281627A1 (en) * 2013-11-15 2016-09-29 Daimler Ag Method and Device for Testing a Fuel Pressure System, Comprising a Fuel Pressure Sensor, of a Combustion Controlled Internal Combustion Engine of a Motor Vehicle
DE102016220123B4 (de) * 2016-10-14 2018-05-09 Continental Automotive Gmbh Verfahren und Vorrichtung zur Plausibilierung der Funktionsfähigkeit eines Hochdrucksensors eines Kraftstoffeinspritzsystems eines Kraftfahrzeugs
DE102017208080A1 (de) * 2017-05-12 2018-04-12 Continental Automotive Gmbh Verfahren zum Betreiben eines Kraftstoffhochdrucksystems
DE102018206838B4 (de) 2018-05-03 2024-06-13 Vitesco Technologies GmbH Verfahren und Vorrichtung zur Diagnose eines Hochdrucksensors eines Kraftfahrzeugs

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JPH0569374U (ja) * 1992-02-28 1993-09-21 富士重工業株式会社 筒内直噴式エンジンの異常警告装置
IT1261575B (it) * 1993-09-03 1996-05-23 Fiat Ricerche Metodo di diagnosi di malfunzionamenti del circuito ad alta pressione di impianti di iniezione ad alta pressione per motori a combustione interna
DE19547647A1 (de) 1995-12-20 1997-06-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine
JPH1054318A (ja) * 1996-08-09 1998-02-24 Denso Corp エンジン用蓄圧式燃料供給装置
US6024064A (en) * 1996-08-09 2000-02-15 Denso Corporation High pressure fuel injection system for internal combustion engine
JP3834918B2 (ja) * 1997-03-04 2006-10-18 いすゞ自動車株式会社 エンジンの燃料噴射方法及びその装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013017420B3 (de) * 2013-10-19 2015-02-19 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Verfahren zur Diagnose eines Kraftstoffdrucksensors beim Betrieb einer Brennkraftmaschine
DE102013021925B3 (de) * 2013-12-20 2015-05-28 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Verfahren zur Diagnose eines Kraftstoffdrucksensors beim Betrieb einer Verbrennungskraftmaschine

Also Published As

Publication number Publication date
EP0976921A2 (de) 2000-02-02
DE19834660A1 (de) 2000-02-03
JP2000054903A (ja) 2000-02-22
EP0976921A3 (de) 2001-03-07
DE59909841D1 (de) 2004-08-05
JP4313901B2 (ja) 2009-08-12

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