EP0780559B1 - Method and apparatus for controlling an internal combustion engine - Google Patents

Method and apparatus for controlling an internal combustion engine Download PDF

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Publication number
EP0780559B1
EP0780559B1 EP96111144A EP96111144A EP0780559B1 EP 0780559 B1 EP0780559 B1 EP 0780559B1 EP 96111144 A EP96111144 A EP 96111144A EP 96111144 A EP96111144 A EP 96111144A EP 0780559 B1 EP0780559 B1 EP 0780559B1
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EP
European Patent Office
Prior art keywords
pressure
fuel
region
pressure region
low
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EP96111144A
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German (de)
French (fr)
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EP0780559A2 (en
EP0780559A3 (en
Inventor
Jürgen Ing. Biester
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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
    • F02D41/30—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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/021—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by locking pump pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/227—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the invention is based on a method and one Device for controlling an internal combustion engine according to the Genus of claim 1 and 5 respectively.
  • the Fuel from an electric fuel pump Fuel tank promoted and via fuel lines fed to the injectors.
  • internal combustion engines with High pressure injection especially in internal combustion engines with auto ignition, joins the Electric fuel pump another pump that a very high pressure in a high pressure area of the Fuel supply generated with the injectors communicates.
  • pressure control valve provided, with the help of the pressure in the high pressure range is adjustable. This pressure control valve is not working properly, the case may arise that the pressure in the High pressure range increases to inadmissible values.
  • a controller is a Internal combustion engine with a high pressure injection and one Common rail system known in which the fuel from at least one pump from a low pressure area into one High pressure area is promoted.
  • the fuel pressure in the High pressure area is recorded with a pressure sensor and with a pressure control to predeterminable values.
  • At a Defect in the area of the pressure control is switched off the internal combustion engine, causing the high pressure pump is switched off.
  • the disadvantage is that with one corresponding defect, the internal combustion engine is switched off becomes. Emergency operation is not possible in this case.
  • the invention is based, with one Method of a device for controlling a Internal combustion engine even with a defective pressure control valve to be able to maintain emergency operation. This task is by the in the independent claims marked features solved.
  • FIG. 1 shows a block diagram of the device according to the invention
  • Figure 2 is a flow diagram of the method according to the invention.
  • FIG. 1 are those for understanding the invention required components of a Fuel supply system of an internal combustion engine with High pressure injection shown.
  • the system shown is commonly referred to as a common rail system.
  • With 10 is called a fuel tank. This stands via a fuel supply line with a filter 15, one Pre-feed pump 20, a shut-off valve 25, one High-pressure feed pump 30 in connection with a rail 35.
  • a pressure control valve 40 or a pressure relief valve arranged in the fuel supply line is between the High pressure feed pump 30 and the rail 35 .
  • a pressure control valve 40 or a pressure relief valve arranged in the fuel supply line is between the High pressure feed pump 30 and the rail 35 .
  • the pressure control valve connects the high pressure area with a low pressure area.
  • the fuel returns via the return line 45 the tank 10.
  • the shut-off valve 25 can be actuated by means of a coil 26.
  • the valve 40 is correspondingly by means of a coil 41 controllable.
  • a sensor 50 is arranged on the rail 35. at this sensor 50 is preferably one Pressure sensor that provides a signal that the Fuel pressure in the rail and thus the pressure in the High pressure area corresponds.
  • the rail 35 is connected to the individual injectors 61 to 66 in connection.
  • the injectors comprise solenoid valves 71 to 76 by means of which the Fuel flow is controllable through the injectors. Of the injectors each have a connection with the return line 45 in connection.
  • the output signal of the pressure sensor 50 and the Output signals of further sensors 80 reach one Control unit 100 which in turn solenoid valves 71 to 76, the coil 26 of the pre-feed pump, the coil 41 of the Pressure control valve 40 and the high pressure feed pump controls.
  • the pre-feed pump 20 that as an electric fuel pump or mechanical pump can be carried, promotes the fuel that is in the Fuel reservoir 10 is located via a filter 15 to the high pressure feed pump 30.
  • the high pressure feed pump 30 feeds the fuel into the rail 35 and builds one there Pressure that is between about 100 and 2000 bar.
  • shut-off valve 25 is arranged that of the Control unit 100 can be controlled in order to increase the fuel flow interrupt.
  • Control unit 100 determines control signals Actuation of the solenoid valves 71 to 76 of the injectors 61 to 66. By opening and closing the solenoid valves 71 to 76 becomes the beginning and end of fuel injection controlled in the internal combustion engine.
  • the pressure of the fuel is measured by means of the pressure sensor 50 detected in the rail 35 and thus in the high pressure area. outgoing
  • the control unit 100 calculates a signal from this value to act on the pressure control valve 40.
  • the pressure is increased by actuating the pressure control valve 40 regulated a predeterminable value, which among other things from Operating conditions of the internal combustion engine depends on that can be detected by means of the sensors 80.
  • the pressure control valve remains in due to a fault in its closed or in a partially closed Position, the pressure rises in the high pressure area, particularly strong in Rail 35.
  • the shut-off valve 25 and / or the feed pump 20 are switched off, or by means of Shut-off valve 25 and / or the pre-feed pump 20 a simplified pressure control takes place.
  • a setpoint PS for the pressure is generated in the rail as a function F of the speed N and the fuel quantity to be injected QK determined. It can if necessary, further variables for determining the Setpoint PS are used. With a simplified Embodiment, this value PS can be a fixed value be specified.
  • the actual value PI is determined using the Sensor 50 detected.

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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)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren und einer Vorrichtung zur Steuerung einer Brennkraftmaschine nach der Gattung des Anspruchs 1 bzw. 5.The invention is based on a method and one Device for controlling an internal combustion engine according to the Genus of claim 1 and 5 respectively.

Bei Kraftfahrzeugen mit einer Brennkraftmaschine wird der Kraftstoff mit Hilfe einer Elektrokraftstoffpumpe aus einem Kraftstoffbehälter gefördert und über Kraftstoffleitungen den Einspritzventilen zugeführt. Bei Brennkraftmaschinen mit Hochdruckeinspritzung, insbesondere bei Brennkraftmaschinen mit Selbstzündung, schließt sich an die Elektrokraftstoffpumpe eine weitere Pumpe an, die einen sehr hohen Druck in einen Hochdruckbereich der Kraftstoffversorgung erzeugt, der mit den Einspritzventilen in Verbindung steht. Des weiteren ist ein Druckregelventil vorgesehen, mit dessen Hilfe der Druck im Hochdruckbereich regelbar ist. Arbeitet dieses Druckregelventil nicht ordnungsgemäß, kann der Fall eintreten, daß der Druck im Hochdruckbereich auf unzulässige Werte ansteigt.In motor vehicles with an internal combustion engine, the Fuel from an electric fuel pump Fuel tank promoted and via fuel lines fed to the injectors. With internal combustion engines with High pressure injection, especially in internal combustion engines with auto ignition, joins the Electric fuel pump another pump that a very high pressure in a high pressure area of the Fuel supply generated with the injectors communicates. There is also a pressure control valve provided, with the help of the pressure in the high pressure range is adjustable. This pressure control valve is not working properly, the case may arise that the pressure in the High pressure range increases to inadmissible values.

Aus der EP-A-0501 459 ist eine Steuerung einer Brennkraftmaschine mit einer Hochdruckeinspritzung und einem Common-Rail-System bekannt, bei dem der Kraftstoff von wenigstens einer Pumpe von einem Niederdruckbereich in einen Hochdruckbereich gefördert wird. Der Kraftstoffdruck im Hochdruckbereich wird mit einem Drucksensor erfasst und mit einer Druckregelung auf vorgebbare Werte geregelt. Bei einem Defekt im Bereich der Druckregelung erfolgt eine Abschaltung der Brennkraftmaschine, wodurch auf die Hochdruckpumpe abgeschaltet wird. Nachteilig ist es, dass bei einem entsprechenden Defekt die Brennkraftmaschine abgeschaltet wird. Ein Notfahrbetrieb ist in diesem Fall nicht möglich. From EP-A-0501 459 a controller is a Internal combustion engine with a high pressure injection and one Common rail system known in which the fuel from at least one pump from a low pressure area into one High pressure area is promoted. The fuel pressure in the High pressure area is recorded with a pressure sensor and with a pressure control to predeterminable values. At a Defect in the area of the pressure control is switched off the internal combustion engine, causing the high pressure pump is switched off. The disadvantage is that with one corresponding defect, the internal combustion engine is switched off becomes. Emergency operation is not possible in this case.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt die Aufgabe zugrunde, bei einem Verfahren einer Vorrichtung zur Steuerung einer Brennkraftmaschine auch bei einem defekten Druckregelventil ein Notfahrbetrieb aufrecht halten zu können. Diese Aufgabe wird durch die in den unabhängigen Ansprüchen gekennzeichneten Merkmale gelöst.The invention is based, with one Method of a device for controlling a Internal combustion engine even with a defective pressure control valve to be able to maintain emergency operation. This task is by the in the independent claims marked features solved.

Vorteile der ErfindungAdvantages of the invention

Mit der beschriebenen Vorgehensweise kann bei Ausfall des Druckregelventils ein eingeschränkter Betrieb sichergestellt werden ohne daß unzulässig hohe Drücke auftreten.With the described procedure, if the Pressure control valve ensures limited operation will occur without impermissibly high pressures.

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 characterized.

Zeichnungdrawing

Die Erfindung wird nachstehend anhand der in den Zeichnungen dargestellten Ausführungsformen erläutert. Es zeigen Figur 1 ein Blockdiagramm der erfindungsgemäßen Vorrichtung und Figur 2 ein Flußdiagramm des erfindungsgemäßen Verfahrens.The invention is described below with reference to the drawings illustrated embodiments explained. 1 shows a block diagram of the device according to the invention and Figure 2 is a flow diagram of the method according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur 1 sind die für das Verständnis der Erfindung erforderlichen Bestandteile eines Kraftstoffversorgungssystems einer Brennkraftmaschine mit Hochdruckeinspritzung dargestellt. Das dargestellte System wird üblicherweise als Common-Rail-System bezeichnet. Mit 10 ist ein Kraftstoffvorratsbehälter bezeichnet. Dieser steht über eine Kraftstoffzuführleitung mit einem Filter 15, einer Vorförderpumpe 20, einem Absperrventil 25, einer Hochdruckförderpumpe 30 mit einem Rail 35 in Verbindung.In Figure 1 are those for understanding the invention required components of a Fuel supply system of an internal combustion engine with High pressure injection shown. The system shown is commonly referred to as a common rail system. With 10 is called a fuel tank. This stands via a fuel supply line with a filter 15, one Pre-feed pump 20, a shut-off valve 25, one High-pressure feed pump 30 in connection with a rail 35.

In der Kraftstoffzuführleitung ist zwischen der Hochdruckförderpumpe 30 und dem Rail 35 ein Druckregelventil 40 bzw. ein Druckbegrenzungsventil angeordnet. Mittels dieses Ventils ist die Zuführleitung mit einer Rücklaufleitung 45 verbindbar. Das Druckregelventil verbindet den Hochdruckbereich mit einem Niederdruckbereich. Über die Rücklaufleitung 45 gelangt der Kraftstoff zurück in den Tank 10.In the fuel supply line is between the High pressure feed pump 30 and the rail 35 a pressure control valve 40 or a pressure relief valve arranged. through this valve is the supply line with a Return line 45 connectable. The pressure control valve connects the high pressure area with a low pressure area. The fuel returns via the return line 45 the tank 10.

Das Absperrventil 25 ist mittels einer Spule 26 betätigbar. Entsprechend ist das Ventil 40 mittels einer Spule 41 ansteuerbar. Am Rail 35 ist ein Sensor 50 angeordnet. Bei diesem Sensor 50 handelt es sich vorzugsweise um einen Drucksensor, der ein Signal bereitstellt, das dem Kraftstoffdruck im Rail und damit dem Druck im Hochdruckbereich entspricht.The shut-off valve 25 can be actuated by means of a coil 26. The valve 40 is correspondingly by means of a coil 41 controllable. A sensor 50 is arranged on the rail 35. at this sensor 50 is preferably one Pressure sensor that provides a signal that the Fuel pressure in the rail and thus the pressure in the High pressure area corresponds.

Das Rail 35 steht über jeweils eine Leitung mit den einzelnen Injektoren 61 bis 66 in Verbindung. Die Injektoren umfassen Magnetventile 71 bis 76 mittels denen der Kraftstofffluß durch die Injektoren steuerbar ist. Des weiteren stehen die Injektoren mit jeweils einem Anschluß mit der Rücklaufleitung 45 in Verbindung.The rail 35 is connected to the individual injectors 61 to 66 in connection. The injectors comprise solenoid valves 71 to 76 by means of which the Fuel flow is controllable through the injectors. Of the injectors each have a connection with the return line 45 in connection.

Das Ausgangssignal des Drucksensors 50 sowie die Ausgangssignale weiterer Sensoren 80 gelangen zu einer Steuereinheit 100 die wiederum die Magnetventile 71 bis 76, die Spule 26 der Vorförderpumpe, die Spule 41 des Druckregelventils 40 und die Hochdruckförderpumpe steuert.The output signal of the pressure sensor 50 and the Output signals of further sensors 80 reach one Control unit 100 which in turn solenoid valves 71 to 76, the coil 26 of the pre-feed pump, the coil 41 of the Pressure control valve 40 and the high pressure feed pump controls.

Diese Einrichtung arbeitet wie folgt. Die Vorförderpumpe 20, die als Elektrokraftstoffpumpe oder mechanische Pumpe ausgeführt sein kann, fördert den Kraftstoff, der sich im Kraftstoffvorratsbehälter 10 befindet über einen Filter 15 zur Hochdruckförderpumpe 30. Die Hochdruckförderpumpe 30 fördert den Kraftstoff in das Rail 35 und baut dort einen Druck auf, der zwischen zirka 100 und 2000 bar liegt.This facility works as follows. The pre-feed pump 20, that as an electric fuel pump or mechanical pump can be carried, promotes the fuel that is in the Fuel reservoir 10 is located via a filter 15 to the high pressure feed pump 30. The high pressure feed pump 30 feeds the fuel into the rail 35 and builds one there Pressure that is between about 100 and 2000 bar.

Zwischen der Hochdruckförderpumpe 30 und der Vorförderpumpe 20 ist ein Absperrventil 25 angeordnet, daß von der Steuereinheit 100 ansteuerbar ist, um den Kraftstofffluß zu unterbrechen.Between the high pressure feed pump 30 and the pre-feed pump 20 is a shut-off valve 25 is arranged that of the Control unit 100 can be controlled in order to increase the fuel flow interrupt.

Ausgehend von den Signalen verschiedener Sensoren 80 bestimmt die Steuereinheit 100 Steuersignale zur Beaufschlagung der Magnetventile 71 bis 76 der Injektoren 61 bis 66. Durch Öffnen und Schließen der Magnetventile 71 bis 76 wird der Beginn und das Ende der Kraftstoffeinspritzung in die Brennkraftmaschine gesteuert.Based on the signals from various sensors 80 Control unit 100 determines control signals Actuation of the solenoid valves 71 to 76 of the injectors 61 to 66. By opening and closing the solenoid valves 71 to 76 becomes the beginning and end of fuel injection controlled in the internal combustion engine.

Mittels des Drucksensors 50 wird der Druck des Kraftstoffes im Rail 35 und damit im Hochdruckbereich erfaßt. Ausgehend von diesem Wert berechnet die Steuereinheit 100 ein Signal zur Beaufschlagung des Druckregelventils 40. Vorzugsweise wird der Druck durch Ansteuern des Druckregelventils 40 auf einen vorgebbaren Wert geregelt, der unter anderem von Betriebsbedingungen der Brennkraftmaschine abhängt, die mittels der Sensoren 80 erfaßt werden.The pressure of the fuel is measured by means of the pressure sensor 50 detected in the rail 35 and thus in the high pressure area. outgoing The control unit 100 calculates a signal from this value to act on the pressure control valve 40. Preferably the pressure is increased by actuating the pressure control valve 40 regulated a predeterminable value, which among other things from Operating conditions of the internal combustion engine depends on that can be detected by means of the sensors 80.

Verbleibt das Druckregelventil bedingt durch einen Fehler in seiner geschlossenen bzw. in einer teilweise geschlossenen Stellung, so steigt der Druck im Hochdruckbereich, insbesondere im Rail 35 stark an. Erfindungsgemäß ist nun vorgesehen, daß in diesem Fall das Absperrventil 25 und/oder die Vorförderpumpe 20 abgeschaltet werden, bzw. mittels des Absperrventils 25 und/oder der Vorförderpumpe 20 eine vereinfachte Druckregelung erfolgt. The pressure control valve remains in due to a fault in its closed or in a partially closed Position, the pressure rises in the high pressure area, particularly strong in Rail 35. According to the invention is now provided that in this case the shut-off valve 25 and / or the feed pump 20 are switched off, or by means of Shut-off valve 25 and / or the pre-feed pump 20 a simplified pressure control takes place.

In Figur 2 ist eine Ausführungsform der erfindungsgemäßen Vorgehensweise anhand eines Flußdiagrammes dargestellt. In einem ersten Schritt 200 wird ein Sollwert PS für den Druck im Rail als Funktion F von der Drehzahl N und der einzuspritzenden Kraftstoffmenge QK ermittelt. Es können gegebenenfalls noch weitere Größen zur Ermittlung des Sollwertes PS herangezogen werden. Bei einer vereinfachten Ausführungsform kann dieser Wert PS als fester Wert vorgegeben werden.In Figure 2 is an embodiment of the invention The procedure is shown using a flow chart. In In a first step 200, a setpoint PS for the pressure is generated in the rail as a function F of the speed N and the fuel quantity to be injected QK determined. It can if necessary, further variables for determining the Setpoint PS are used. With a simplified Embodiment, this value PS can be a fixed value be specified.

In einem zweiten Schritt 210 wird der Istwert PI mittels des Sensors 50 erfaßt. Die sich anschließende Abfrage 220 überprüft, ob der Istwert größer als ein oberer Schwellwert ist. Dieser Schwellwert ergibt sich durch Summation des erwarteten Werts PS und eines Toleranzwertes Δ1. Für den Schwellwert S1 gilt die Beziehung S1 = PS + Δ1. Ist dies der Fall, so übersteigt der tatsächliche Druck PI im Rail den maximal zulässigen Raildruck und im Schritt 230 wird die Abstellvorrichtung, dies ist beispielsweise das Absperrventil 25 bzw. die Vorförderpumpe 20, so angesteuert, daß sie den Kraftstofffluß unterbinden.In a second step 210, the actual value PI is determined using the Sensor 50 detected. The subsequent query 220 checks whether the actual value is greater than an upper threshold is. This threshold is obtained by summing the expected value PS and a tolerance value Δ1. For the Threshold S1, the relationship S1 = PS + Δ1 applies. Is this the If so, the actual pressure PI in the rail exceeds maximum allowable rail pressure and in step 230 the Parking device, this is for example that Shut-off valve 25 or the pre-feed pump 20, controlled so that they stop the flow of fuel.

Erkennt die Abfrage 220 dagegen, daß der Wert PI des Raildruckes nicht größer als der maximal zulässige Raildruck ist, so erfolgt die Abfrage 240, die überprüft, ob der Istwert kleiner als ein unterer Schwellwert S2 ist. Dieser Schwellwert ergibt sich aus dem erwarteten Wert PS und einem Toleranzwert Δ2 gemäß der Beziehung S2 = PS - Δ2. Ist dies nicht der Fall so setzt das Programm mit dem Schritt 200 fort. Ist dies der Fall, so ist der minimal zulässige Raildruck unterschritten und die Abstellvorrichtung wird so angesteuert, daß der Kraftstofffluß möglich ist. In contrast, query 220 recognizes that the value PI of the Rail pressure not greater than the maximum permissible rail pressure the query 240 takes place, which checks whether the Actual value is less than a lower threshold value S2. This Threshold results from the expected value PS and one Tolerance value Δ2 according to the relationship S2 = PS - Δ2. Is this If not, the program continues with step 200 continued. If this is the case, the minimum is permissible Rail pressure falls below and the parking device is so controlled that the fuel flow is possible.

Bei der oben beschriebenen Vorgehensweise wird eine vereinfachte Druckregelung realisiert, bei dem der Regler als Zwei-Punkt-Regler ausgeführt ist. Erfindungsgemäß kann auch vorgesehen sein, daß nur überprüft wird, ob der Druck größer als der höchstzulässige Wert ist und in diesem Fall abgeschaltet und sobald er kleiner ist wieder eingeschaltet wird. In diesem Ausführungsbeispiel entfällt die Abfrage 240.In the procedure described above, a Simplified pressure control implemented in which the regulator is designed as a two-point controller. According to the invention also be provided that it is only checked whether the pressure is greater than the maximum permissible value and in this case switched off and switched on again as soon as it is smaller becomes. In this embodiment, the query is omitted 240th

Ist eine Regelung des Kraftstoffdrucks vorgesehen, so kann sowohl ein unzulässig hoher als auch ein unzulässig niederer Druckwert im Hochdruckbereich durch Maßnahmen im Niederdruckbereich kompensiert werden. Mit dieser Vorgehensweise ist bei fehlerhaft arbeitendem Druckregelventil 40 ein eingeschränkter Druckregelbetrieb sichergestellt.If regulation of the fuel pressure is provided, then both an impermissibly high and an impermissibly low Pressure value in the high pressure area through measures in the Low pressure range can be compensated. With this The procedure is for those who work incorrectly Pressure control valve 40 is a restricted pressure control operation ensured.

Claims (9)

  1. Method for controlling an internal combustion engine having high-pressure injection, in particular for an internal combustion engine having a common-rail system, the fuel being fed by at least one pump from a low-pressure region into a high-pressure region, the fuel pressure being sensed in the high-pressure region with a pressure sensor, and it being possible to regulate the fuel pressure with a pressure regulation means, characterized in that, when there is a defect in the pressure regulation region, it is possible, by influencing the flow of fuel in the low-pressure region, to adjust the fuel pressure, to a predefinable value with which restricted operation can be ensured.
  2. Method according to Claim 1, characterized in that the flow of fuel in the low-pressure region is interrupted if the pressure in the high-pressure region rises above a predefinable value.
  3. Method according to one of Claims 1 or 2,
    characterized in that the flow of fuel in the low-pressure region is released if the pressure in the high-pressure region drops below a second predefinable value.
  4. Method according to one of the preceding claims, characterized in that the first and second predefinable values for the pressure can be predefined as a function of at least the rotation speed (N) and/or the fuel quantity (QK) to be injected.
  5. Device for controlling an internal combustion engine with high-pressure injection, in particular for an internal combustion engine with a common-rail system, with at least one pump which feeds fuel from a low-pressure region into a high-pressure region, with a pressure sensor which senses the fuel pressure in the high-pressure region and with fuel pressure regulating means, characterized in that means are provided which, when there is a defect in the pressure regulating region, adjust the fuel pressure, by influencing the flow of fuel in the low-pressure region, to a predefinable value with which restricted operation can be ensured.
  6. Device according to Claim 5, characterized in that means are provided which interrupt the flow of fuel in the low-pressure region if the pressure in the high-pressure region rises above a predefinable value.
  7. Device according to one of Claims 5 or 6, characterized in that when there is a defect in the means for regulating pressure, pressure is regulated in the high-pressure region by interrupting the flow of fuel in the low-pressure region.
  8. Device according to one of Claims 5 to 7, characterized in that, in order to interrupt the flow of fuel in the low-pressure region, a shut-off valve (25) and/or a pre-delivery pump (20) is used.
  9. Device according to one of Claims 5 to 8, characterized in that pressure regulation is carried out by means of a two-point regulator.
EP96111144A 1995-12-22 1996-07-11 Method and apparatus for controlling an internal combustion engine Expired - Lifetime EP0780559B1 (en)

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DE19548280A DE19548280A1 (en) 1995-12-22 1995-12-22 Method and device for controlling an internal combustion engine
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DE59608539D1 (en) 2002-02-07
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DE19548280A1 (en) 1997-06-26
JPH09195834A (en) 1997-07-29
EP0780559A3 (en) 1998-03-11
JP3999298B2 (en) 2007-10-31

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