EP0811116B1 - 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 Download PDF

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Publication number
EP0811116B1
EP0811116B1 EP96926997A EP96926997A EP0811116B1 EP 0811116 B1 EP0811116 B1 EP 0811116B1 EP 96926997 A EP96926997 A EP 96926997A EP 96926997 A EP96926997 A EP 96926997A EP 0811116 B1 EP0811116 B1 EP 0811116B1
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EP
European Patent Office
Prior art keywords
pressure
pressure signal
internal combustion
combustion engine
value
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Expired - Lifetime
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EP96926997A
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German (de)
French (fr)
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EP0811116A1 (en
Inventor
Detlev Straub
Jürgen Biester
Martin Grosser
Claus Hinrichsen
Wilhelm Eyberg
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D41/22—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
    • 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
    • F02D41/22—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 to monitor a fuel metering system Internal combustion engine according to the generic terms of the independent Expectations.
  • Method and device for monitoring a Fuel metering system of an internal combustion engine known.
  • a Fuel metering system of an internal combustion engine known.
  • one supports Prefeed pump fuel from a low pressure range in a high pressure area.
  • the fuel is controllable injectors the individual combustion chambers of the Internal combustion engine metered.
  • a sensor detects the pressure in the High pressure range, which is taken into account in the control. Accurate fuel metering is only possible if the exact value of the pressure in the high pressure range is known.
  • the pressure is in the range between a few 100 to approx. 2000 bar. Within this The pressure sensor must reliably transmit a signal provide. A failure of the pressure sensor or a faulty signal from the pressure sensor leads to a inaccurate fuel metering.
  • the invention is based, with one Method and a device of the type mentioned improve the accuracy of fuel metering.
  • This Task is by the in the independent claims marked features solved.
  • WO / A-95/06814 discloses monitoring a Fuel metering system of an internal combustion engine, in which the Fuel from a low pressure area by means of a pump a high pressure area is promoted. From there by means of Fuel controllable depending on the operating parameters Injectors measurable the combustion chambers of the internal combustion engine. On Sensor provides a pressure signal that the pressure in the High pressure area characterized. In given Operating conditions, the pressure signal with an expected Value compared and, depending on the comparison, an incorrect one Pressure signal recognized.
  • the disadvantage of this device is that it cannot be distinguished whether there is a fault in the pressure sensor or from other components of the metering system.
  • DE-OS 43 35 700 is a device and a Method known in which a drift of the output signal of a position sensor is reliably detected. For this, in certain operating conditions in which the position of a Known approximately, the measured variable is recorded and with compared to the expected value. Starting from this Comparison can be a drift or an error of the Detect position sensor.
  • FIG. 1 shows a block diagram of a common rail system
  • Figure 2 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 the 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 rail 112 which assigned to the high pressure area of the fuel metering system is.
  • 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 into rail 112.
  • the pressure in 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 control valve 120 releases the connection by means of the coil 115 can be adjusted. Depending on the current I, that flows through the coil 115 turn up different pressure values in the high pressure range.
  • Step 200 it is checked whether a defined one Operating status is present. If this is the case, then in Step 210 the actual pressure PI from the pressure sensor 110 detected. In step 220, starting from various Quantities which are detected by means of sensors 225 expected value PS determined for the pressure. The value PS will preferably depending on suitable sizes from one Map memory read out. In the subsequent step 230 the two pressure values PI and PS are checked for plausibility checked.
  • step 200 If the measured pressure value PI is plausible, then this sets Program continues with step 200.
  • Query 230 recognizes that the values are not plausible, so in step 250 the Measured values PI corrected or an error is recognized.
  • implausible Pressure values detected for errors This is in step 250 displayed. This can be done using a Display device take place. On the other hand, it is also possible in this case to initiate an emergency operation.
  • drift is recognized and corrected this.
  • the difference becomes in step 250 between the expected value PS and the measured value PI certainly. Based on this difference, one can then Determine the correction value for the measured value PI. With this Correction value, the measured value is continuously corrected.
  • step 200 checks whether there is an overrun operation.
  • overrun mode no fuel is usually injected. Will the Thrust operation is recognized, so the pressure control valve 120 controlled so that it is in its open position remains.
  • the pressure value PS that now arises only shows still a relatively small spread.
  • the value PS expected for this operating state depends of the speed N stored in a map. Gives way to measured pressure PI from the speed-dependent value PS around more than a predefinable threshold value, then in Step 250 detected for errors.
  • the Check before starting the engine or after the shutdown of the internal combustion engine is usually the pressure control valve 120 controlled so that the pressure decreases. Usually the pressure decreases to atmospheric pressure or it builds up down to a predetermined value. This predetermined value depends on the design of the pressure control valve. According to the invention, query 200 therefore checks whether the engine is turned off, that is, whether it is before or after the start.
  • Step 210 the program starts Step 210 before starting or after turning off is processed automatically.
  • the pressure PI is recorded and with a predetermined value, that of the pressure control valve used 120 depends. Is the pressure control valve designed so that there is a decrease in pressure to atmospheric pressure enables, an output signal of a Atmospheric pressure sensor used as a comparison value PS become.
  • the detected value PI of the pressure compared with a value PS, the of the current I flowing through the pressure control valve 115 depends.
  • the pressure P it was recognized that there was a defined relationship between the pressure P and the the pressure control valve I gives flowing current.
  • the Current I becomes a setpoint PS for the setpoint in step 220 of the pressure.
  • the expected one Pressure value as a function of the current stored in a map. This procedure is used to check the correct function of the pressure sensor without using any other Sensors possible.

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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)

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

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 to monitor a fuel metering system Internal combustion engine according to the generic terms of the independent Expectations.

Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine sind bekannt. Bei einem Common-Rail-System fördert eine Vorförderpumpe Kraftstoff von einem Niederdruckbereich in einen Hochdruckbereich. Von dort wird der Kraftstoff mittels steuerbarer Injektoren den einzelnen Brennräumen der Brennkraftmaschine zugemessen. Die Ansteuerung der Injektoren erfolgt abhängig 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.Method and device for monitoring a Fuel metering system of an internal combustion engine known. In a common rail system, one supports Prefeed pump fuel from a low pressure range in a high pressure area. From there, the fuel is controllable injectors the individual combustion chambers of the Internal combustion engine metered. The control of the Depending on the operating state of the injectors Internal combustion engine. A sensor detects the pressure in the High pressure range, which is taken into account in the control. Accurate 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.With common rail systems, the pressure is in the range between a few 100 to approx. 2000 bar. Within this The pressure sensor must reliably transmit a signal provide. A failure of the pressure sensor or a faulty signal from the pressure sensor leads to a 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 is based, with one Method and a device of the type mentioned improve the accuracy of fuel metering. This Task is by the in the independent claims marked features solved.

Die WO/A-95/06814 offenbart eine Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine, bei dem der Kraftstoff mittels einer Pumpe von einem Niederdruckbereich in einen Hochdruckbereich gefördert wird. Von dort mittels ist der Kraftstoff mittels betriebskenngrößenabhängig steuerbarer Injektoren den Brennräumen der Brennkraftmaschine zumeßbar. Ein Sensor stellt ein Drucksignal bereit, daß den Druck im Hochdruckbereich charakterisiert. In vorgegebenen Betriebszuständen wird das Drucksignal mit einem erwarteten Wert verglichen und abhängig von dem Vergleich ein fehlerhaftes Drucksignal erkannt. Nachteilig bei dieser Einrichtung ist, daß nicht unterschieden werden kann, ob ein Fehler des Drucksensors oder von anderen Komponenten des Zumeßsystems vorliegt.WO / A-95/06814 discloses monitoring a Fuel metering system of an internal combustion engine, in which the Fuel from a low pressure area by means of a pump a high pressure area is promoted. From there by means of Fuel controllable depending on the operating parameters Injectors measurable the combustion chambers of the internal combustion engine. On Sensor provides a pressure signal that the pressure in the High pressure area characterized. In given Operating conditions, the pressure signal with an expected Value compared and, depending on the comparison, an incorrect one Pressure signal recognized. The disadvantage of this device is that it cannot be distinguished whether there is a fault in the pressure sensor or from other components of the metering system.

Aus der DE-OS 43 35 700 ist eine Einrichtung und ein Verfahren bekannt, bei der eine Drift des Ausgangssignals eines Positionssensors 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.From DE-OS 43 35 700 is a device and a Method known in which a drift of the output signal of a position sensor is reliably detected. For this, in certain operating conditions in which the position of a Known approximately, the measured variable is recorded and with compared to the expected value. Starting from this Comparison can be a drift or an error of the Detect position sensor.

Vorteile der ErfindungAdvantages of the invention

Mit der erfindungsgemäßen Vorgehensweise ist eine genaue Kraftstoffzumessung möglich. Drifterscheinungen und Fehler des Drucksensors eines Common-Railsystems können sicher erkannt und ggf. kompensiert werden.With the procedure according to the invention is an exact Fuel metering possible. Drift phenomena and errors the pressure sensor of a common rail system can safely recognized and compensated if necessary.

Vorteilhafte und zweckmäßige Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet. Advantageous and expedient configurations and Further developments of the invention are in the subclaims featured.

Zeichnungdrawing

Die Erfindung wird nachstehend anhand der in der Zeichnung dargestellten Ausführungsformen erläutert. Es zeigen Figur 1 ein Blockdiagramm eines Common-Railsystems, Figur 2 ein Flußdiagramm des erfindungsgemäßen Verfahrens.The invention is described below with reference to the drawing illustrated embodiments explained. 1 shows a block diagram of a common rail system, Figure 2 a Flow chart 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 ein 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.In Figure 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 the 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.

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 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.

Der Drucksensor 110 erfaßt den Druck in einem Rail 112, das dem Hochdruckbereich des Kraftstoffzumeßsystems zugeordnet ist. Das Rail 112 steht mit verschiedenen Injektoren 111 in Kontakt. Das Rail 112 ist über eine 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 assigned to the high pressure area of the fuel metering system is. 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.

Diese Einrichtung arbeitet nun wie folgt. Die Vorförderpumpe 127 fördert den Kraftstoff über das Filter 129 aus dem Tank zur Hochruckpumpe 125. Dieser Bereich wird als Niederdruckbereich bezeichnet. Die Hochdruckpumpe 125 fördert den Kraftstoff unter hohem Druck über die Hochdruckleitung 122 in das Rail 112. Der Druck im Rail 112 und damit im Hochdruckbereich wird mittels des Drucksensors 110 erfaßt und der Steuerung 100 zugeleitet.This facility now works as follows. 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 into rail 112. The pressure in rail 112 and thus in the high pressure area by means of the pressure sensor 110 detected 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 that the pressure sensor 110 provides, as well as the output signals of the others The controller 100 applies sensors to the injectors 111 with control signals that control the fuel metering.

Mittels des Druckregelventils 120 kann der Druck in der 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.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 control valve 120 releases the connection by means of the coil 115 can be adjusted. Depending on the current I, that flows through the coil 115 turn up different pressure values 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 in Figur 2 dargestellt, vorgegangen.Since the pressure P of the fuel in the rail 112 is large Has an influence on the accuracy of the fuel metering it is important to the output signal P of the pressure sensor 110 Monitor errors and drift. For this purpose, as in FIG. 2 represented, proceeded.

In einem Schritt 200 wird überprüft, ob ein definierter Betriebszustand vorliegt. Liegt dieser vor, so wird in Schritt 210 der tatsächliche Druck PI vom Drucksensor 110 erfaßt. Im Schritt 220 wird ausgehend von verschiedenen Größen, die mittels Sensoren 225 erfaßt werden, ein erwarteter Wert PS für den Druck ermittelt. Der Wert PS wird vorzugsweise abhängig von geeigneten Größen aus einem Kennfeldspeicher ausgelesen. Im anschließenden Schritt 230 werden die beiden Druckwerte PI und PS auf Plausibilität überprüft.In a step 200 it is checked whether a defined one Operating status is present. If this is the case, then in Step 210 the actual pressure PI from the pressure sensor 110 detected. In step 220, starting from various Quantities which are detected by means of sensors 225 expected value PS determined for the pressure. The value PS will preferably depending on suitable sizes from one Map memory read out. In the subsequent step 230 the two pressure values PI and PS are checked for plausibility checked.

Zur Prüfung auf Plausibilität wird überprüft, ob der Betrag der Abweichung zwischen dem gemessenen Druck PI und einem erwarteten Druck PS größer als ein Schwellwert S ist.To check for plausibility, it is checked whether the amount the deviation between the measured pressure PI and a expected pressure PS is greater than a 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, then this sets Program continues with step 200. Query 230 recognizes that the values are not plausible, so in step 250 the Measured values PI corrected 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 einer Anzeigeeinrichtung erfolgen. Andrerseits ist es auch möglich in diesem Fall ein Notfahrbetrieb einzuleiten.In one embodiment of the invention, implausible Pressure values detected for errors. This is in step 250 displayed. This can be done using a Display device take place. On the other hand, it is also possible in this case to initiate an emergency operation.

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. In another embodiment, drift is recognized and corrected this. For this purpose, the difference becomes in step 250 between the expected value PS and the measured value PI certainly. Based on this difference, one can then Determine the correction value for the measured value PI. With this Correction value, the measured value is continuously corrected.

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 a first embodiment of the invention, step 200 checks whether there is an overrun operation. In overrun mode no fuel is usually injected. Will the Thrust operation is recognized, so the pressure control valve 120 controlled so that it is in its open position remains. The pressure value PS that now arises only shows still a relatively small spread. According to the invention the value PS expected for this operating state depends of the speed N stored in a map. Gives way to measured pressure PI from the speed-dependent value PS around more than a predefinable threshold value, then in Step 250 detected for errors.

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 before starting the engine or after the shutdown of the internal combustion engine. When parking the The internal combustion engine is usually the pressure control valve 120 controlled so that the pressure decreases. Usually the pressure decreases to atmospheric pressure or it builds up down to a predetermined value. This predetermined value depends on the design of the pressure control valve. According to the invention, query 200 therefore checks whether the engine is turned off, that is, whether it is before or after the start.

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 starts Step 210 before starting or after turning off is processed automatically.

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 bis auf Atmosphärendruck ermöglicht, so kann ein Ausgangssignal eines Atmosphärendruckfühlers als Vergleichswert PS verwendet werden.Is the internal combustion engine before the start or in Caster, the pressure PI is recorded and with a predetermined value, that of the pressure control valve used 120 depends. Is the pressure control valve designed so that there is a decrease in pressure to atmospheric pressure enables, an output signal of a Atmospheric pressure sensor used as a comparison value PS become.

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.Switch the expected value PS and the measured value PI more than one permissible difference value from each other, so is recognized for errors or drift. With a recognized The start of the internal combustion engine can prevent errors become.

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. Erfindungsgemäß 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 compared with a value PS, the of the current I flowing through the pressure control valve 115 depends. According to the invention, it was recognized that there was a defined relationship between the pressure P and the the pressure control valve I gives flowing current. Depending on the Current I becomes a setpoint PS for the setpoint in step 220 of the pressure. Preferably the expected one Pressure value as a function of the current stored in a map. This procedure is used to check the correct function of the pressure sensor without using any other Sensors possible.

Claims (8)

  1. Process for monitoring a fuel metering system of an internal combustion engine, in which the fuel is fed, by means of a pump, from a low-pressure area into a high-pressure area and can be metered from there to the combustion spaces of the internal combustion engine by means of injectors which can be controlled as a function of operating characteristic variables, a sensor providing a pressure signal which characterizes the pressure in the high-pressure area, characterized in that during overrun conditions the pressure regulating valve is actuated in such a way that it remains in its open position, in that the pressure signal is compared with an anticipated value, and an incorrect pressure signal is detected if the pressure signal (PI) deviates from the anticipated value (PS) by more than a predefinable threshold value.
  2. Method for monitoring a fuel metering system of an internal combustion engine, in which the fuel is fed, by means of a pump, from a low-pressure area into a high-pressure area and can be metered from there to the combustion spaces of the internal combustion engine by means of injectors which can be controlled as a function of operating characteristic variables, a sensor providing a pressure signal which characterizes the pressure in the high-pressure area, characterized in that during running-on and/or before the engine starts, the pressure signal is compared with an anticipated value (PI) and an incorrect pressure signal is detected if the pressure signal (PI) deviates from the anticipated value (PF).
  3. Method according to Claim 1, characterized in that the anticipated value can be predefined as a function of the rotational speed.
  4. Method according to Claim 2, characterized in that the anticipated value is provided by an atmospheric pressure sensor.
  5. Method according to Claim 1 or 2, characterized in that a pressure regulating valve can be supplied with a predefinable current and it can be checked whether the pressure signal drops to the anticipated value.
  6. Method according to Claim 5, characterized in that the anticipated value can be predefined as a function of the current which flows through the pressure regulating value.
  7. Device for monitoring a fuel metering system of an internal combustion engine, in which the fuel is fed, by means of a pump, from a low-pressure area into a high-pressure area and can be metered from there to the combustion spaces of the internal combustion engine by means of injectors which can be controlled as a function of operating characteristic variables, a sensor providing a pressure signal which characterizes the pressure in the high-pressure area, characterized in that means are provided which actuate the pressure regulating valve during overrun conditions in such a way that it remains in its open position, and which compare the pressure signal with an anticipated value and detect an incorrect pressure signal if the pressure signal (PI) deviates from the anticipated value (PF) by more than a predefinable threshold value.
  8. Device for monitoring a fuel metering system of an internal combustion engine, in which the fuel is fed, by means of a pump, from a low-pressure area into a high-pressure area and can be metered from there to the combustion spaces of an internal combustion engine by means of injectors which can be controlled as a function of operating characteristic variables, a sensor providing a pressure signal which characterizes the pressure in the high-pressure area, characterized in that means are provided which, during running-on and/or before the engine starts, compare the pressure signal with an anticipated value and detect an incorrect pressure signal if the pressure signal (PI) deviates from the anticipated value (PS).
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)

Applications Claiming Priority (3)

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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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EP0811116B1 true EP0811116B1 (en) 2000-04-26

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JP (1) JP4073485B2 (en)
KR (1) KR100413305B1 (en)
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WO (1) WO1997022791A1 (en)

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WO1997022791A1 (en) 1997-06-26
DE59605057D1 (en) 2000-05-31
KR100413305B1 (en) 2004-05-10
JPH11506813A (en) 1999-06-15
DE19547647A1 (en) 1997-06-26
EP0811116A1 (en) 1997-12-10
JP4073485B2 (en) 2008-04-09
KR19980702318A (en) 1998-07-15

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