EP0811116A1 - Process and device for monitoring a fuel metering system of an internal combustion engine - Google Patents

Process and device for monitoring a fuel metering system of an internal combustion engine

Info

Publication number
EP0811116A1
EP0811116A1 EP96926997A EP96926997A EP0811116A1 EP 0811116 A1 EP0811116 A1 EP 0811116A1 EP 96926997 A EP96926997 A EP 96926997A EP 96926997 A EP96926997 A EP 96926997A EP 0811116 A1 EP0811116 A1 EP 0811116A1
Authority
EP
European Patent Office
Prior art keywords
pressure
internal combustion
combustion engine
expected value
pressure signal
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.)
Granted
Application number
EP96926997A
Other languages
German (de)
French (fr)
Other versions
EP0811116B1 (en
Inventor
Detlev Straub
Jürgen Biester
Martin Grosser
Claus Hinrichsen
Wilhelm Eyberg
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 EP0811116A1 publication Critical patent/EP0811116A1/en
Application granted granted Critical
Publication of EP0811116B1 publication Critical patent/EP0811116B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • 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
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off

Definitions

  • the invention relates to a method and a device for monitoring a fuel metering system of an internal combustion engine according to the preambles of the independent claims.
  • Preliminary pump fuel from a low pressure area m a high pressure area. From there, the fuel is metered to the individual combustion chambers of the internal combustion engine by means of controllable injectors.
  • the injectors are controlled depending on the operating state of the internal combustion engine.
  • a sensor detects the pressure in the high-pressure range, which is taken into account in the control.A precise fuel metering is only possible if the exact value of the Pressure in the high pressure range is known.
  • the pressure In common rail systems, the pressure is in the range between a few 100 to approx. 2000 bar Range, the pressure sensor must reliably provide a signal. A failure of the pressure sensor or a faulty signal from the pressure sensor leads to an inaccurate fuel metering.
  • the invention has for its object to improve the accuracy of the fuel metering in a method and a device of the type mentioned. This object is achieved by the features characterized in the independent claims.
  • DE-OS 43 35 700 discloses a device and a method in which a drift of the output signal of a position sensor is reliably detected.
  • the measured variable is recorded in certain operating states in which the position of an actuator is approximately known and compared with the expected value. Based on this comparison, a drift or an error of the position sensor can be recognized.
  • FIG. 1 shows a block diagram of a common rail system
  • FIG. 2 shows a flow diagram of the method according to the invention
  • a controller is designated by 100.
  • a pressure controller 101 which controls em switching means 102 and is acted upon by the output signals of a current measuring means 103.
  • Current control 101 also processes the output signal of a pressure sensor 110 and the output signals of further sensors 105.
  • the first input of switching means 102 is connected to battery voltage via current measuring means 103.
  • the second connection of the switching means 102 is in contact with a coil 115, the second input of which is connected to ground.
  • the further sensors 105 are sensors which detect various operating states of the internal combustion engine and of the vehicle driven by the internal combustion engine. These are, for example, the engine speed N and the accelerator pedal position, which characterize the driver's request.
  • the pressure sensor 110 detects the pressure in a rail 112, which is assigned to the high-pressure region of the fuel metering system.
  • the Rail 112 is in contact with various injectors 111 m.
  • the rail 112 is connected to a high-pressure pump 125 via a high-pressure line 122.
  • the high-pressure line 122 is also connected to a via a pressure control valve 120 Return line 121 in contact.
  • the high-pressure pump 125 is connected to a prefeed pump 127 and a filter 129 to a tank.
  • the return line 121 is also connected to the tank.
  • the prefeed pump 127 conveys the fuel via the filter 129 from the tank to the high-pressure pump 125. This area is referred to as the low-pressure area.
  • the high-pressure pump 125 delivers the fuel under high pressure via the
  • the pressure in the rail 112 and thus in the high-pressure area is detected by means of the pressure sensor 110 and fed to the controller 100.
  • the controller 100 applies control signals to the injectors 111, which control the fuel metering.
  • High-pressure line 122 and thus in rail 112 are set to predeterminable values.
  • the pressure control valve 120 is designed in such a way that it releases the connection to the return line 121 at a predeterminable pressure in the high-pressure region and thus the pressure is reduced until it drops below the predeterminable pressure value.
  • the pressure value at which the pressure control valve 120 enables the connection can be set by means of the coil 115. Depending on the current I flowing through the coil 115, different pressure values are set in the high pressure range.
  • a step 200 it is checked whether there is a defined operating state. If this is the case, m
  • Step 210 detects the actual pressure PI from the pressure sensor 110.
  • an expected value PS for the pressure is determined on the basis of various quantities, which are detected by sensors 225.
  • the value PS is preferably dependent on suitable sizes from one
  • Map memory read out.
  • the two pressure values PI and PS are checked for plausibility.
  • step 200 If the measured pressure value PI is plausible, the program continues with step 200. If query 230 recognizes that the values are not plausible, the measured values PI are corrected in step 250 or an error is recognized.
  • errors are recognized in the case of implausible pressure values. This is displayed in step 250. This can be done using a
  • drift is recognized and corrected.
  • the difference between the expected value PS and the measured value PI is determined in step 250.
  • a correction value for the measured value PI can then be determined on the basis of this difference.
  • the measured value is continuously corrected with this correction value.
  • it is checked in step 200 whether there is overrun operation. No fuel is usually injected in overrun mode. If the overrun mode is recognized, the pressure control valve 120 is activated such that it remains in its open position. The pressure value PS which now arises has only a relatively small scatter. According to the invention, the value PS expected for this operating state is stored as a function of the speed N in a map. If the measured pressure PI deviates from the speed-dependent value PS by more than a predefinable threshold value, an error is recognized in step 250.
  • the check is carried out before the internal combustion engine starts or after the internal combustion engine is switched off.
  • the pressure control valve 120 is usually controlled so that the pressure is reduced.
  • the pressure usually decreases to atmospheric pressure or decreases to a predetermined value. This predetermined value depends on the design of the pressure control valve. According to the invention, it is therefore checked in query 200 whether the internal combustion engine is switched off, that is to say whether it is before the start or in the wake.
  • the program is automatically processed from step 210 before the start or after the shutdown.
  • the pressure PI is detected and with a predetermined value which depends on the pressure control valve 120 used. Is the pressure control valve designed so that it reduces the pressure to atmospheric pressure enables, an output signal of an atmospheric pressure sensor can be used as a comparison value PS.
  • the expected value PS and the measured value PI differ from one another by more than a permissible difference value, an error or drift is recognized. If an error is detected, the start of the internal combustion engine can be prevented.
  • the detected value PI of the pressure is compared with a value PS which depends on the current I which flows through the pressure control valve 115.
  • a value PS which depends on the current I which flows through the pressure control valve 115.
  • a setpoint PS is specified in step 220 for the setpoint value of the pressure.
  • the expected pressure value is preferably stored as a function of the current in a characteristic diagram. This procedure enables the correct functioning of the pressure sensor to be checked without the use of further sensors.

Abstract

The description relates to a process and a device for monitoring a fuel metering system of an internal combustion engine. The fuel is conveyed by a pump from a low-pressure to a high-pressure region and from there can be metered into the combustion chambers of the engine by means of injectors controllable in accordance with operative characteristics. A sensor provides a pressure signal characterising the pressure in the high-pressure region. The pressure signal is compared in predetermined operating conditions with an expected value and a faulty pressure signal is recognised depending on the comparison.

Description

Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer BrennkraftmaschineMethod and device for monitoring a fuel metering system of an internal combustion engine
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine gemäß den Oberbegriffen der unabhängigen Ansprüche.The invention relates to a method and a device for monitoring a fuel metering system of an internal combustion engine according to the preambles of the independent claims.
Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine sind bekannt. Bei einem Common-Rail-System fordert eineMethods and devices for monitoring a fuel metering system of an internal combustion engine are known. In a common rail system, one
Vorforderpumpe Kraftstoff von einem Niederdruckbereich m einen Hochdruckbereich. Von dort wird der Kraftstoff mittels steuerbarer Injektoren den einzelnen Brennräumen der Brennkraftmaschine zugemessen Die Ansteuerung der Injektoren erfolgt abhangig vom Betriebszustand der Brennkraftmaschine Ein Sensor erfaßt den Druck im Hochdruckbereich, der bei der Steuerung berücksichtigt wird Eine genaue Kraftstoffzumessung ist nur möglich, wenn der genaue Wert des Druckes im Hochdruckbereich bekannt ist .Preliminary pump fuel from a low pressure area m a high pressure area. From there, the fuel is metered to the individual combustion chambers of the internal combustion engine by means of controllable injectors.The injectors are controlled depending on the operating state of the internal combustion engine.A sensor detects the pressure in the high-pressure range, which is taken into account in the control.A precise fuel metering is only possible if the exact value of the Pressure in the high pressure range is known.
Bei üblichen Common-Railsystemen liegt der Druck im Bereich zwischen einigen 100 bis ca 2000 bar Innerhalb dieses Bereichs muß der Drucksensor zuverlässig ein Signal bereitstellen. Ein Ausfall des Drucksensors bzw. ein fehlerhaftes Signal des Drucksensors führt zu einer ungenauen Kraftstoffzumessung.In common rail systems, the pressure is in the range between a few 100 to approx. 2000 bar Range, the pressure sensor must reliably provide a signal. A failure of the pressure sensor or a faulty signal from the pressure sensor leads to an inaccurate fuel metering.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt die Aufgabe zugrunde, bei einem Verfahren und einer Vorrichtung der eingangs genannten Art die Genauigkeit der Kraftstoffzumessung zu verbessern. Diese Aufgabe wird durch die in den unabhängigen Ansprüchen gekennzeichneten Merkmale gelöst.The invention has for its object to improve the accuracy of the fuel metering in a method and a device of the type mentioned. This object is achieved by the features characterized in the independent claims.
Aus der DE-OS 43 35 700 ist eine Einrichtung und ein Verfahren bekannt, bei der eine Drift des Ausgangsεignals eines Poεitionssensors sicher erkannt wird. Hierzu wird in bestimmten Betriebszuständen, in denen die Position eines Stellers annähernd bekannt ist, die Meßgröße erfaßt und mit dem erwarteten Wert verglichen. Ausgehend von diesem Vergleich läßt sich eine Drift oder ein Fehler des Positionssensors erkennen.DE-OS 43 35 700 discloses a device and a method in which a drift of the output signal of a position sensor is reliably detected. For this purpose, the measured variable is recorded in certain operating states in which the position of an actuator is approximately known and compared with the expected value. Based on this comparison, a drift or an error of the position sensor can be recognized.
Vorteile der ErfindungAdvantages of the invention
Mit der erfindungsgemäßen Vorgehensweise ist eine genaueWith the procedure according to the invention is an exact
Kraftstoffzumessung möglich. Drifterscheinungen und Fehler des Drucksensors eines Common-RailSystems können sicher erkannt und ggf. kompensiert werden.Fuel metering possible. Drift phenomena and errors in the pressure sensor of a common rail system can be reliably detected and, if necessary, compensated.
Vorteilhafte und zweckmäßige Ausgestaltungen undAdvantageous and expedient configurations and
Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet . ZeichnungDevelopments of the invention are characterized in the subclaims. drawing
Die Erfindung wird nachstehend anhand der in der Zeichnung dargestellten Ausführungsformen erläutert Es zeigen Figur 1 em Blockdiagramm eines Common-Railsystems, Figur 2 em Flußdiagramm des erfindungsgemaßen VerfahrensThe invention is explained below with reference to the embodiments shown in the drawing. FIG. 1 shows a block diagram of a common rail system, FIG. 2 shows a flow diagram of the method according to the invention
Beschreibung der AusführungsbeispieleDescription of the embodiments
In Figur 1 ist ein Common-Railsystem als Blockdiagramm dargestellt. Mit 100 ist eine Steuerung bezeichnet Diese umfaßt u.a. eine Drucksteuerung 101, die em Schaltmittel 102 ansteuert und mit den Ausgangssignalen eines Strommeßmittels 103 beaufschlagt wird Die Stromsteuerung 101 verarbeitet ferner das Ausgangssignal eines Drucksensors 110 sowie die Ausgangssignale von weiteren Sensoren 105 Der erste Eingang des Schaltmittels 102 ist über das Strommeßmittel 103 mit BatterieSpannung verbunden. Der zweite Anschluß des Schaltmittels 102 steht mit einer Spule 115 in Kontakt, deren zweiter Eingang mit Masse in Verbindung steht.A common rail system is shown as a block diagram in FIG. A controller is designated by 100. a pressure controller 101, which controls em switching means 102 and is acted upon by the output signals of a current measuring means 103. Current control 101 also processes the output signal of a pressure sensor 110 and the output signals of further sensors 105. The first input of switching means 102 is connected to battery voltage via current measuring means 103. The second connection of the switching means 102 is in contact with a coil 115, the second input of which is connected to ground.
Bei den weiteren Sensoren 105 handelt es sich um Sensoren, die verschiedene Betriebszustände der Brennkraftmaschine und des von der Brennkraftmaschine angetriebenen Fahrzeugs erfassen. Hierbei handelt es sich beispielsweise um die Drehzahl N der Brennkraftmaschine und die Fahrpedalstellung, die den Fahrerwunsch kennzeichnen.The further sensors 105 are sensors which detect various operating states of the internal combustion engine and of the vehicle driven by the internal combustion engine. These are, for example, the engine speed N and the accelerator pedal position, which characterize the driver's request.
Der Drucksensor 110 erfaßt den Druck m einem Rail 112, das dem Hochdruckbereich des Kraftstoffzumeßsystems zugeordnet ist. Das Rail 112 steht mit verschiedenen Injektoren 111 m Kontakt. Das Rail 112 ist über eme Hochdruckleitung 122 mit einer Hochdruckpumpe 125 verbunden. Die Hochdruckleitung 122 steht ferner über ein Druckregelventil 120 mit einer Rückführleitung 121 in Kontakt. Die Hochdruckpumpe 125 steht mit einer Vorförderpumpe 127 und einem Filter 129 mit einem Tank in Verbindung. Mit dem Tank steht auch die Rückführleitung 121 in Verbindung.The pressure sensor 110 detects the pressure in a rail 112, which is assigned to the high-pressure region of the fuel metering system. The Rail 112 is in contact with various injectors 111 m. The rail 112 is connected to a high-pressure pump 125 via a high-pressure line 122. The high-pressure line 122 is also connected to a via a pressure control valve 120 Return line 121 in contact. The high-pressure pump 125 is connected to a prefeed pump 127 and a filter 129 to a tank. The return line 121 is also connected to the tank.
Diese Einrichtung arbeitet nun wie folgt. Die Vorförderpumpe 127 fördert den Kraftstoff über daε Filter 129 aus dem Tank zur Hochruckpumpe 125. Dieser Bereich wird als Niederdruckbereich bezeichnet . Die Hochdruckpumpe 125 fördert den Kraftstoff unter hohem Druck über dieThis facility now works as follows. The prefeed pump 127 conveys the fuel via the filter 129 from the tank to the high-pressure pump 125. This area is referred to as the low-pressure area. The high-pressure pump 125 delivers the fuel under high pressure via the
Hochdruckleitung 122 in das Rail 112. Der Druck im Rail 112 und damit im Hochdruckbereich wird mittels des Druckεensors 110 erfaßt und der Steuerung 100 zugeleitet.High-pressure line 122 into the rail 112. The pressure in the rail 112 and thus in the high-pressure area is detected by means of the pressure sensor 110 and fed to the controller 100.
Abhängig von dem Drucksignal P, das der Drucksensor 110 bereitstellt, sowie den Ausgangssignalen der weiteren Sensoren beaufschlagt die Steuerung 100 die Injektoren 111 mit Ansteuersignalen, die die Kraftstoffzumessung steuern.Depending on the pressure signal P, which the pressure sensor 110 provides, and the output signals of the further sensors, the controller 100 applies control signals to the injectors 111, which control the fuel metering.
Mittels des Druckregelventils 120 kann der Druck in derThe pressure in the
Hochdruckleitung 122 und damit im Rail 112 auf vorgebbare Werte eingestellt werden. Das Druckregelventil 120 ist so ausgebildet, daß es bei einem vorgebbaren Druck im Hochdruckbereich die Verbindung zur Rückführleitung 121 freigibt und damit der Druck abgebaut wird, bis er unter dem vorgebbaren Druckwert abfällt. Der Druckwert, bei dem das Druckregelventil 120 die Verbindung freigibt, kann mittels der Spule 115 eingestellt werden. Abhängig von dem Strom I, der durch die Spule 115 fließt, stellen sich unterschiedliche Druckwerte im Hochdruckbereich ein.High-pressure line 122 and thus in rail 112 are set to predeterminable values. The pressure control valve 120 is designed in such a way that it releases the connection to the return line 121 at a predeterminable pressure in the high-pressure region and thus the pressure is reduced until it drops below the predeterminable pressure value. The pressure value at which the pressure control valve 120 enables the connection can be set by means of the coil 115. Depending on the current I flowing through the coil 115, different pressure values are set in the high pressure range.
Da der Druck P des Kraftstoffes im Rail 112 einen großen Einfluß auf die Genauigkeit der Kraftstoffzumessung hat, ist es wichtig, das Ausgangsignal P des Drucksensors 110 auf Fehler und Drift zu überwachen. Hierzu wird wie m Figur 2 dargestellt, vorgegangen.Since the pressure P of the fuel in the rail 112 has a great influence on the accuracy of the fuel metering, it is important to set the output signal P of the pressure sensor 110 on Monitor errors and drift. To do this, proceed as shown in FIG. 2.
In einem Schritt 200 wird überprüft, ob ein definierter Betriebszustand vorliegt. Liegt dieser vor, so wird mIn a step 200 it is checked whether there is a defined operating state. If this is the case, m
Schritt 210 der tatsächliche Druck PI vom Drucksensor 110 erfaßt. Im Schritt 220 wird ausgehend von verschiedenen Größen, die mittels Sensoren 225 erfaßt werden, em erwarteter Wert PS für den Druck ermittelt. Der Wert PS wird vorzugsweise abhängig von geeigneten Größen aus einemStep 210 detects the actual pressure PI from the pressure sensor 110. In step 220, an expected value PS for the pressure is determined on the basis of various quantities, which are detected by sensors 225. The value PS is preferably dependent on suitable sizes from one
Kennfeldspeicher ausgelesen. Im anschließenden Schritt 230 werden die beiden Druckwerte PI und PS auf Plausibilität überprüft .Map memory read out. In the subsequent step 230, the two pressure values PI and PS are checked for plausibility.
Zur Prüfung auf Plausibilität wird überprüft, ob der Betrag der Abweichung zwischen dem gemessenen Druck PI und einem erwarteten Druck PS größer als em Schwellwert S ist.To check for plausibility, it is checked whether the amount of the deviation between the measured pressure PI and an expected pressure PS is greater than the threshold value S.
Ist der gemessene Druckwert PI plausibel, so setzt das Programm mit Schritt 200 fort. Erkennt die Abfrage 230, daß die Werte nicht plausibel sind, so werden in Schritt 250 die Meßwerte PI korrigiert bzw. es wird auf Fehler erkannt.If the measured pressure value PI is plausible, the program continues with step 200. If query 230 recognizes that the values are not plausible, the measured values PI are corrected in step 250 or an error is recognized.
Bei einer Ausgestaltung der Erfindung wird bei unplausiblen Druckwerten auf Fehler erkannt. Dieser wird in Schritt 250 angezeigt. Dies kann zum einen mittels einerIn one embodiment of the invention, errors are recognized in the case of implausible pressure values. This is displayed in step 250. This can be done using a
Anzeigeeinrichtung erfolgen. Andrerseits ist es auch möglich in diesem Fall em Notfahrbetrieb einzuleiten.Display device take place. On the other hand, it is also possible to initiate emergency operation in this case.
Bei einer anderen Ausgestaltung wird auf Drift erkannt und diese korrigiert. Hierzu wird in Schritt 250 die Differenz zwischen dem erwarteten Wert PS und dem gemessenen Wert PI bestimmt. Ausgehend von dieser Differenz läßt sich dann ein Korrekturwert für den Meßwert PI bestimmen. Mit diesem Korrekturwert wird der Meßwert laufend korrigiert. Bei einer ersten Ausgestaltung der Erfindung wird in Schritt 200 überprüft, ob ein Schubbetrieb vorliegt. Im Schubbetrieb wird üblicherweise kein Kraftstoff eingespritzt . Wird der Schubbetrieb erkannt, so wird das Druckregelventil 120 derart angesteuert, daß es in seiner geöffneten Stellung verbleibt. Der sich nun einstellende Druckwert PS weist nur noch eine relativ geringe Streuung auf. Erfindungsgemäß wird der für diesen Betriebszustand erwartete Wert PS abhängig von der Drehzahl N in einem Kennfeld abgelegt. Weicht der gemessene Druck PI von dem drehzahlabhängigen Wert PS um mehr als einen vorgebbaren Schwellwert ab, so wird in Schritt 250 auf Fehler erkannt.In another embodiment, drift is recognized and corrected. For this purpose, the difference between the expected value PS and the measured value PI is determined in step 250. A correction value for the measured value PI can then be determined on the basis of this difference. The measured value is continuously corrected with this correction value. In a first embodiment of the invention, it is checked in step 200 whether there is overrun operation. No fuel is usually injected in overrun mode. If the overrun mode is recognized, the pressure control valve 120 is activated such that it remains in its open position. The pressure value PS which now arises has only a relatively small scatter. According to the invention, the value PS expected for this operating state is stored as a function of the speed N in a map. If the measured pressure PI deviates from the speed-dependent value PS by more than a predefinable threshold value, an error is recognized in step 250.
Bei einer weiteren Ausgestaltung der Erfindung erfolgt die Überprüfung vor dem Start der Brennkraftmaschine bzw. nach dem Abstellen der Brennkraftmaschine. Beim Abstellen der Brennkraftmaschine wird üblicherweise das Druckregelventil 120 so angesteuert, daß sich der Druck abbaut. Üblicherweise baut sich der Druck auf Atmosphärendruck ab bzw. er baut sich auf einen vorgegebenen Wert ab. Dieser vorgegebene Wert hängt von der Ausgestaltung des Druckregelventils ab. Erfindungsgemäß wird daher in der Abfrage 200 überprüft, ob die Brennkraftmaschine abgestellt ist, das heißt, ob sie sich vor dem Start bzw. im Nachlauf befindet.In a further embodiment of the invention, the check is carried out before the internal combustion engine starts or after the internal combustion engine is switched off. When the internal combustion engine is switched off, the pressure control valve 120 is usually controlled so that the pressure is reduced. The pressure usually decreases to atmospheric pressure or decreases to a predetermined value. This predetermined value depends on the design of the pressure control valve. According to the invention, it is therefore checked in query 200 whether the internal combustion engine is switched off, that is to say whether it is before the start or in the wake.
Alternativ kann auch vorgesehen sein, daß das Programm ab Schritt 210 jeweils vor dem Start oder nach dem Abstellen automatisch abgearbeitet wird.Alternatively, it can also be provided that the program is automatically processed from step 210 before the start or after the shutdown.
Befindet sich die Brennkraftmaschine vor dem Start bzw. im Nachlauf, so wird der Druck PI erfaßt und mit einem vorgegebenen Wert, der von dem verwendeten Druckregelventil 120 abhängt. Ist das Druckregelventil so ausgestaltet, daß es einen Abbau des Drucks biε auf Atmosphärendruck ermöglicht, so kann ein Ausgangssignal eines Atmosphärendruckfühlers als Vergleichswert PS verwendet werden.If the internal combustion engine is before starting or after-running, the pressure PI is detected and with a predetermined value which depends on the pressure control valve 120 used. Is the pressure control valve designed so that it reduces the pressure to atmospheric pressure enables, an output signal of an atmospheric pressure sensor can be used as a comparison value PS.
Weichen der erwartete Wert PS und der gemessene Wert PI um mehr als ein zulässiger Differenzwert voneinander ab, so wird auf Fehler oder Drift erkannt. Bei einem erkannten Fehler kann der Start der Brennkraftmaschine unterbunden werden.If the expected value PS and the measured value PI differ from one another by more than a permissible difference value, an error or drift is recognized. If an error is detected, the start of the internal combustion engine can be prevented.
Bei einer weiteren Ausgestaltung der Erfindung wird der erfaßte Wert PI des Drucks mit einem Wert PS verglichen, der vom Strom I, der durch das Druckregelventil 115 fließt, abhängt. Erfindungsgemaß wurde erkannt, daß es einen definierten Zusammenhang zwischen dem Druck P und dem durch das Druckregelventil I fließenden Strom gibt. Abhängig vom Strom I wird im Schritt 220 ein Sollwert PS für den Sollwert des Druckes vorgegeben. Vorzugsweise ist der erwartete Druckwert als Funktion vom Strom in einem Kennfeld abgelegt . Mittels dieser Vorgehensweise ist die Überprüfung der korrekten Funktion des Drucksensors ohne Verwendung weiterer Sensoren möglich. In a further embodiment of the invention, the detected value PI of the pressure is compared with a value PS which depends on the current I which flows through the pressure control valve 115. According to the invention it was recognized that there is a defined relationship between the pressure P and the current flowing through the pressure control valve I. Depending on the current I, a setpoint PS is specified in step 220 for the setpoint value of the pressure. The expected pressure value is preferably stored as a function of the current in a characteristic diagram. This procedure enables the correct functioning of the pressure sensor to be checked without the use of further sensors.

Claims

Ansprüche Expectations
1. Verfahren zur Überwachung eines Kraftstoffzumeßsystems emer Brennkraftmaschine, be] dem der Kraftstoff mittels einer Pumpe von einem Niederdruckbereich m emen Hochdruckbereich gefordert wird, und von dort mittels betriebskenngroßenabhängig steuerbarer Injektoren den Brennraumen der Brennkraftmaschine zumeßbar ist, wobei em Sensor em Drucksignal bereitstellt, das den Druck im Hochdruckbereich charakterisiert, dadurch gekennzeichnet, daß m vorgegebenen Betriebszuständen das Drucksignal mit einem erwarteten Wert verglichen wird und abhangig von dem Vergleich em fehlerhaftes Drucksignal erkannt wird.1. Method for monitoring a fuel metering system in an internal combustion engine, in which the fuel is required by means of a pump from a low-pressure area to a high-pressure area, and from there by means of injectors which can be controlled according to the operating parameters, the combustion chambers of the internal combustion engine can be measured, the sensor providing a pressure signal which provides the Characterized pressure in the high pressure range, characterized in that in the predetermined operating states, the pressure signal is compared with an expected value and, depending on the comparison, a faulty pressure signal is recognized.
2 Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein Druckregelventil derart ansteuerbar ist, daß der Druck im Hochdruckbereich auf einen vorgegebenen Wert abfallt, und überprüft wird, ob das Drucksignal auf den erwarteten Wert abfällt.2 The method according to claim 1, characterized in that a pressure control valve can be controlled such that the pressure in the high pressure area drops to a predetermined value, and it is checked whether the pressure signal drops to the expected value.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der erwartete Wert abhängig von der Drehzahl vorgebbar ist3. The method according to claim 2, characterized in that the expected value can be predetermined depending on the speed
4 Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der erwartet Wert von einem Athmospharendrucksensor bereitgestellt wird. 4 The method according to claim 2, characterized in that the expected value is provided by an atmospheric pressure sensor.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, ein Druckregelventil mit einem vorgebbaren Strom beaufschlagbar ist, und überprüft wird, ob das Drucksignal auf den erwarteten Wert abfällt.5. The method according to claim 1, characterized in that a preselectable current can be applied to a pressure control valve, and it is checked whether the pressure signal drops to the expected value.
6. Verfahren nach Anεpruch 5, dadurch gekennzeichnet, daß der erwartete Wert abhängig vom Strom, der durch das Druckregelventil fließt, vorgebbar ist.6. The method according to Anεpruch 5, characterized in that the expected value depending on the current flowing through the pressure control valve, can be predetermined.
7. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Überprüfung im Nachlauf, im Schubbetrieb und/oder vor dem Start erfolgt .7. The method according to any one of the preceding claims, characterized in that the check is carried out in the wake, in overrun mode and / or before the start.
8. Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine, bei dem der Kraftstoff mittels einer Pumpe von einem Niederdruckbereich in einen Hochdruckbereich gefördert wird, und von dort mittels betriebskenngrößenabhängig steuerbarer Injektoren den Brennräumen der Brennkraftmaschine zumeßbar ist, wobei ein Sensor ein Drucksignal bereitstellt, das den Druck im8.Device for monitoring a fuel metering system of an internal combustion engine, in which the fuel is conveyed from a low-pressure area to a high-pressure area by means of a pump, and from there by means of injectors which can be controlled as a function of the operating parameters, the combustion chambers of the internal combustion engine can be measured, with a sensor providing a pressure signal which measures the pressure in the
Hochdruckbereich charakterisiert, dadurch gekennzeichnet, daß Mittel vorgesehen sind, die in vorgegebenen Betriebεzuεtänden das Drucksignal mit einem erwarteten Wert vergleichen und abhängig von dem Vergleich ein fehlerhafteε Druckεignal erkennen. High-pressure area characterized, characterized in that means are provided which compare the pressure signal with an expected value in predetermined operating states and, depending on the comparison, recognize a faulty pressure signal.
EP96926997A 1995-12-20 1996-07-18 Process and device for monitoring a fuel metering system of an internal combustion engine Expired - Lifetime EP0811116B1 (en)

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DE19547647 1995-12-20
DE19547647A DE19547647A1 (en) 1995-12-20 1995-12-20 Method and device for monitoring a fuel metering system of an internal combustion engine
PCT/DE1996/001349 WO1997022791A1 (en) 1995-12-20 1996-07-18 Process and device for monitoring a fuel metering system of an internal combustion engine

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JP4073485B2 (en) 2008-04-09
KR100413305B1 (en) 2004-05-10
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WO1997022791A1 (en) 1997-06-26
DE19547647A1 (en) 1997-06-26
JPH11506813A (en) 1999-06-15
EP0811116B1 (en) 2000-04-26
DE59605057D1 (en) 2000-05-31

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