EP0764777A2 - 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
EP0764777A2
EP0764777A2 EP96110218A EP96110218A EP0764777A2 EP 0764777 A2 EP0764777 A2 EP 0764777A2 EP 96110218 A EP96110218 A EP 96110218A EP 96110218 A EP96110218 A EP 96110218A EP 0764777 A2 EP0764777 A2 EP 0764777A2
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EP
European Patent Office
Prior art keywords
fuel
internal combustion
combustion engine
metering
fault
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Granted
Application number
EP96110218A
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German (de)
French (fr)
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EP0764777A3 (en
EP0764777B1 (en
Inventor
Jürgen Biester
Martin Dipl.-Ing. Grosser
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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

Definitions

  • the invention relates to a method and a device for controlling an internal combustion engine according to the preambles of the independent claims.
  • a safety shut-off valve is usually provided to ensure a safety shutdown in the event of a fault.
  • Such a safety shut-off valve is called ELAB in diesel internal combustion engines.
  • the object of the invention is to ensure a safety shutdown in a method and a device for controlling an internal combustion engine of the type mentioned at the outset, which ensures shutdown as quickly as possible.
  • the procedure according to the invention has the advantage that rapid shutdown in the event of a fault is also possible with so-called common rail systems. At the same time, the pressure in the high-pressure section is quickly released in the event of a fault.
  • the usual shut-off valve and its control can be omitted, which means a considerable saving in costs. A test of the facility is not necessary as this is ensured by normal operation.
  • FIG. 1 shows an injection system according to the invention and FIG. 2 shows various injection pulses plotted over time.
  • the device according to the invention is illustrated below using the example of a self-igniting internal combustion engine in which the fuel metering is controlled by means of a solenoid valve.
  • the embodiment shown in Figure 1 relates to a so-called common rail system.
  • the procedure according to the invention is not restricted to these systems.
  • 100 denotes an internal combustion engine which is supplied with fresh air via an intake line 105 and emits exhaust gases via an exhaust line 110.
  • the internal combustion engine shown is a four-cylinder internal combustion engine.
  • An injector 120, 121, 122 and 123 is assigned to each cylinder of the internal combustion engine.
  • Fuel is metered into the injectors via solenoid valves 130, 131, 132 and 133.
  • the fuel passes from a so-called rail 135 via the injectors 120, 121, 122 and 123 into the cylinders of the internal combustion engine 100.
  • the fuel in the rail 135 is brought to an adjustable pressure by a high-pressure pump 145.
  • the high-pressure pump 145 is connected to a fuel delivery pump 155 via a solenoid valve 150.
  • the fuel delivery pump 155 is connected to a fuel reservoir 160.
  • the valve 150 comprises a coil 152.
  • the solenoid valves 130, 131, 132 and 133 contain coils 140, 141, 142 and 143 which can be supplied with current by means of an output stage 175.
  • the output stage 175 is preferably arranged in a control unit 170, which controls the coil 152 accordingly.
  • a sensor 177 is provided, which detects the pressure in the rail 135 and sends a corresponding signal to the control unit 170.
  • An error detection 176 evaluates various signals and, in the event of an error, applies a corresponding signal to the output stage 175 and the valve 152.
  • a flow limiter 180, 181, 182 and 183 is arranged between the rail 135 and the injectors 120 to 123.
  • the injector and the flow limiter preferably form a structural unit.
  • the flow limiter can also be arranged between the solenoid valve and the rail or between the solenoid valve and the respective injector.
  • the flow restrictors are designed such that they interrupt the connection between the rail 135 and the injectors if more than a predetermined amount of fuel flows through this line.
  • the flow limiter closes when a certain amount of fuel is metered. This quantity is selected so that it is larger than the largest quantity that occurs during error-free operation. It is therefore larger than the full load quantity or the starting quantity.
  • the amount is also selected so that it is smaller than the amount at which the internal combustion engine is damaged.
  • the fuel feed pump 155 conveys the fuel from the reservoir via the valve 150 to the high-pressure pump 145.
  • the high-pressure pump 145 builds up a predeterminable pressure in the rail 135. Pressure values of approximately 30 to 100 bar are usually achieved in the rail 135 in systems for spark-ignited internal combustion engines and pressure values of approximately 1000 to 2000 bar in the case of self-igniting internal combustion engines.
  • the corresponding solenoid valves 130 to 133 are activated.
  • the control signals for the coils determine the start of injection and the end of injection of the fuel by injectors 120 to 123.
  • an error occurs in such a system, this may be, for example, a defect in the area of the control unit 170, the high-pressure part and / or the injection valves, it must be ensured that the internal combustion engine comes to a safe standstill.
  • the high-pressure pump 145 In particular, in systems in which the high-pressure pump 145 is driven directly by the internal combustion engine, and thus the high-pressure pump 145 continues to deliver while the internal combustion engine is running, the high-pressure pump 145 cannot be switched off. Therefore, other measures must be taken to ensure that the pressure in the high-pressure section is quickly reduced and the fuel supply is cut off.
  • the procedure according to the invention is now as follows. If the error monitor 175 detects an error, the error monitor 175 switches over to an emergency drive program. This means that the valve 150 is brought into its closed state. This ensures that no further fuel is provided by the pump 115.
  • the solenoid valves 140, 141, 142 and 143 are controlled such that they release the fuel metering in an angular position of the crankshaft, in which the injection makes no contribution to the torque of the internal combustion engine. It is particularly advantageous if the fuel metering is released in the area of the bottom dead center. This means that the fuel is metered immediately before the exhaust valves of the internal combustion engine are opened.
  • the valve can be saved.
  • the fuel is metered in the largest possible angular range so that the injected quantity assumes a larger value than the quantity that the high-pressure pump 145 delivers.
  • this measure rapidly reduces the pressure in the high-pressure part, in particular in the rail 135, and at the same time the internal combustion engine comes to a standstill.
  • FIG. 2a the angular ranges at which fuel metering is usually carried out are plotted using crankshaft degrees.
  • the fuel is usually metered in the area of the top dead center TDC of the respective cylinder.
  • the duration of the metering is between 0 ° and 40 ° crankshaft.
  • FIG. 2b The situation in the event of a fault is plotted in FIG. 2b.
  • the injection now takes place in the area of the bottom dead center UT, the duration of the injection being considerably longer than in normal operation.
  • the duration of the injection is chosen so that the injection flowing fuel quantity assumes such a value that the flow limiters respond and thereby prevent further fuel supply to the cylinders.
  • the amount at which the flow limiters respond should be selected so that no damage to the internal combustion engine occurs with this amount.
  • the injection for emergency shutdown is preferably carried out outside the compression stroke, that is, between 0 degrees crankshaft and 270 degrees crankshaft.
  • the angular range of approximately 100 ° to 200 ° crankshaft after top dead center was recognized as particularly favorable.

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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)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

Fuel is supplied by a pump into a high pressure part, and fuel feed to cylinders is controlled by solenoid valves. In the case of failure, fuel is supplied in an angled sector, in which the supply does not influence the torque. This is in the lower dead centre area of the cylinder concerned. The supplied fuel volume causes a pressure drop in the high pressure part. The volume of fuel supplied causes a flow limiter in the part to stop the fuel flow. This applies only to the faulty cylinder. Supply is within an angled sector of 100 degrees and 200 degrees crankshaft after the upper dead centre of the cylinder concerned.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Steuerung einer Brennkraftmaschine gemäß den Oberbegriffen der unabhängigen Ansprüche.The invention relates to a method and a device for controlling an internal combustion engine according to the preambles of the independent claims.

Ein solches Verfahren und eine solche Vorrichtung zur Steuerung einer Brennkraftmaschine sind bekannt. Üblicherweise ist ein Sicherheitsabschaltventil vorgesehen, daß im Fehlerfall eine Sicherheitsabschaltung gewährleistet. Ein solches Sicherheitsabschaltventil wird bei Dieselbrennkraftmaschinen als ELAB bezeichnet.Such a method and such a device for controlling an internal combustion engine are known. A safety shut-off valve is usually provided to ensure a safety shutdown in the event of a fault. Such a safety shut-off valve is called ELAB in diesel internal combustion engines.

Bei bestimmten Einspritzsystemen, insbesondere bei sogenannten Common-Rail-Systemen ist die Verwendung eines solchen Sicherheitsabschaltventils problematisch, da ein großes Volumen an Kraftstoff, das sich unter hohem Druck befindet, zwischen dem Sicherheitsventil und den Einspritzdüsen vorhanden ist. Nach der Betätigung des Abschaltventils läuft daher der Motor noch für eine gewisse Zeit weiter, bzw. bei einem Leck tritt eine erhebliche Menge an Kraftstoff unter hohem Druck aus.In certain injection systems, in particular in so-called common rail systems, the use of such a safety shut-off valve is problematic since a large volume of fuel, which is under high pressure, is present between the safety valve and the injection nozzles. After the shut-off valve has been actuated, the engine therefore continues to run for a certain time, or if there is a leak, a considerable amount of fuel escapes under high pressure.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt die Aufgabe zugrunde, bei einem Verfahren und einer Vorrichtung zur Steuerung einer Brennkraftmaschine der eingangs genannten Art eine Sicherheitsabschaltung zu gewährleisten, die ein möglichst schnelles Abschalten gewährleistet. Diese Aufgabe wird durch die in den unabhängigen Ansprüchen gekennzeichneten Merkmale gelöst.The object of the invention is to ensure a safety shutdown in a method and a device for controlling an internal combustion engine of the type mentioned at the outset, which ensures shutdown as quickly as possible. This object is achieved by the features characterized in the independent claims.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorgehensweise bietet den Vorteil, daß auch bei sogenannten Common-Rail-Systemen eine schnelle Abschaltung im Fehlerfall möglich ist. Gleichzeitig wird der Druck im Hochdruckteil im Fehlerfall schnell abgebaut. Das übliche Abschaltventil sowie dessen Ansteuerung kann entfallen, was eine erhebliche Einsparung an Kosten bedeutet. Ein Test der Einrichtung ist nicht erforderlich, da dieser durch den Normalbetrieb sichergestellt ist.The procedure according to the invention has the advantage that rapid shutdown in the event of a fault is also possible with so-called common rail systems. At the same time, the pressure in the high-pressure section is quickly released in the event of a fault. The usual shut-off valve and its control can be omitted, which means a considerable saving in costs. A test of the facility is not necessary as this is ensured by normal operation.

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

Zeichnungdrawing

Die Erfindung wird nachstehend anhand der in der Zeichnung dargestellten Ausführungsformen erläutert. Es zeigen Figur 1 ein erfindungsgemäßes Einspritzsystem und Figur 2 verschiedene über der Zeit aufgetragene Einspritzimpulse.The invention is explained below with reference to the embodiments shown in the drawing. FIG. 1 shows an injection system according to the invention and FIG. 2 shows various injection pulses plotted over time.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Im folgenden wird die erfindungsgemäße Vorrichtung am Beispiel einer selbstzündenden Brennkraftmaschine dargestellt, bei der die Kraftstoffzumessung mittels eines Magnetventils gesteuert wird. Die in Figur 1 dargestellte Ausführungsform betrifft ein sogenanntes Common-Rail-System. Die erfindungsgemäße Vorgehensweise ist aber nicht auf diese Systeme beschränkt.The device according to the invention is illustrated below using the example of a self-igniting internal combustion engine in which the fuel metering is controlled by means of a solenoid valve. The embodiment shown in Figure 1 relates to a so-called common rail system. However, the procedure according to the invention is not restricted to these systems.

Mit 100 ist eine Brennkraftmaschine bezeichnet, die über einen Ansaugleitung 105 Frischluft zugeführt bekommt und über eine Abgasleitung 110 Abgase abgibt.100 denotes an internal combustion engine which is supplied with fresh air via an intake line 105 and emits exhaust gases via an exhaust line 110.

Bei der dargestellten Brennkraftmaschine handelt es sich um eine Vierzylinderbrennkraftmaschine. Jedem Zylinder der Brennkraftmaschine ist ein Injektor 120, 121, 122 und 123 zugeordnet. Den Injektoren wird über Magnetventile 130, 131, 132 und 133 Kraftstoff zugemessen. Der Kraftstoff gelangt von einem sogenannten Rail 135 über die Injektoren 120, 121, 122 und 123 in die Zylinder der Brennkraftmaschine 100.The internal combustion engine shown is a four-cylinder internal combustion engine. An injector 120, 121, 122 and 123 is assigned to each cylinder of the internal combustion engine. Fuel is metered into the injectors via solenoid valves 130, 131, 132 and 133. The fuel passes from a so-called rail 135 via the injectors 120, 121, 122 and 123 into the cylinders of the internal combustion engine 100.

Der Kraftstoff in dem Rail 135 wird von einer Hochdruckpumpe 145 auf einen einstellbaren Druck gebracht. Die Hochdruckpumpe 145 ist über ein Magnetventil 150 mit einer Kraftstofförderpumpe 155 verbunden. Die Kraftstofförderpumpe 155 steht mit einem Kraftstoffvorratsbehälter 160 in Verbindung.The fuel in the rail 135 is brought to an adjustable pressure by a high-pressure pump 145. The high-pressure pump 145 is connected to a fuel delivery pump 155 via a solenoid valve 150. The fuel delivery pump 155 is connected to a fuel reservoir 160.

Das Ventil 150 umfaßt eine Spule 152. Die Magnetventile 130, 131, 132 und 133 enthalten Spulen 140, 141, 142 und 143, die mittels einer Endstufe 175 mit Strom beaufschlagt werden können. Die Endstufe 175 ist vorzugsweise in einem Steuergerät 170 angeordnet, das entsprechend die Spule 152 ansteuert.The valve 150 comprises a coil 152. The solenoid valves 130, 131, 132 and 133 contain coils 140, 141, 142 and 143 which can be supplied with current by means of an output stage 175. The output stage 175 is preferably arranged in a control unit 170, which controls the coil 152 accordingly.

Desweiteren ist ein Sensor 177 vorgesehen, der den Druck im Rail 135 erfaßt und ein entsprechendes Signal an das Steuergerät 170 leitet.Furthermore, a sensor 177 is provided, which detects the pressure in the rail 135 and sends a corresponding signal to the control unit 170.

Eine Fehlererkennung 176 wertet verschiedene Signale aus und beaufschlagt im Fehlerfall die Endstufe 175 sowie das Ventil 152 mit einem entsprechenden Signal.An error detection 176 evaluates various signals and, in the event of an error, applies a corresponding signal to the output stage 175 and the valve 152.

Bei einer bevorzugten Ausgestaltung ist zwischen dem Rail 135 und den Injektoren 120 bis 123 jeweils ein Durchflußbegrenzer 180, 181, 182 und 183 angeordnet. Vorzugsweise bilden der Injektor und der Durchflußbegrenzer eine bauliche Einheit. Der Durchflußbegrenzer kann aber auch jeweils zwischen dem Magnetventil und dem Rail oder zwischen dem Magnetventil und dem jeweiligen Injektor angeordnet sein. Die Durchflußbegrenzer sind derart ausgestaltet, daß sie die Verbindung zwischen dem Rail 135 und dem Injektoren unterbrechen, wenn durch diese Leitung mehr als eine vorgegebene Kraftstoffmenge fließt. Je nach Ausgestaltung schließt der Durchflußbegrenzer, wenn eine bestimmte Kraftstoffmenge zugemessen würde. Diese Menge ist so gewählt, daß sie größer ist als die größte beim fehlerfreien Betrieb auftretende Menge. Sie ist daher größer als die Vollastmenge bzw. die Startmenge. Die Menge ist ferner so gewählt, daß sie kleiner ist, als die Menge, bei der die Brennkraftmaschine beschädigt wird.In a preferred embodiment, a flow limiter 180, 181, 182 and 183 is arranged between the rail 135 and the injectors 120 to 123. The injector and the flow limiter preferably form a structural unit. The flow limiter can also be arranged between the solenoid valve and the rail or between the solenoid valve and the respective injector. The flow restrictors are designed such that they interrupt the connection between the rail 135 and the injectors if more than a predetermined amount of fuel flows through this line. Depending on the design, the flow limiter closes when a certain amount of fuel is metered. This quantity is selected so that it is larger than the largest quantity that occurs during error-free operation. It is therefore larger than the full load quantity or the starting quantity. The amount is also selected so that it is smaller than the amount at which the internal combustion engine is damaged.

Dies Einrichtung arbeitet nun wie folgt. Die Kraftstofförderpumpe 155 fördert den Kraftstoff aus dem Vorratsbehälter über das Ventil 150 zur Hochdruckpumpe 145. Die Hochdruckpumpe 145 baut in dem Rail 135 einen vorgebbaren Druck auf. Üblicherweise werden im Rail 135 bei Systemen für fremdgezündete Brennkraftmaschinen Druckwerte von etwa 30 bis 100 bar und bei selbstzündenden Brennkraftmaschinen Druckwerte von etwa 1000 bis 2000 bar erzielt.This facility now works as follows. The fuel feed pump 155 conveys the fuel from the reservoir via the valve 150 to the high-pressure pump 145. The high-pressure pump 145 builds up a predeterminable pressure in the rail 135. Pressure values of approximately 30 to 100 bar are usually achieved in the rail 135 in systems for spark-ignited internal combustion engines and pressure values of approximately 1000 to 2000 bar in the case of self-igniting internal combustion engines.

Durch Bestromen der Spulen 140 bis 143 werden die entsprechenden Magnetventile 130 bis 133 angesteuert. Die Ansteuersignale für die Spulen legen dabei den Einspritzbeginn und das Einspritzende des Kraftstoffs durch die Injektoren 120 bis 123 fest.By energizing the coils 140 to 143, the corresponding solenoid valves 130 to 133 are activated. The control signals for the coils determine the start of injection and the end of injection of the fuel by injectors 120 to 123.

Tritt bei einem solchen System ein Fehler auf, hierbei kann es sich beispielsweise um einen Defekt im Bereich der Steuereinheit 170, des Hochdruckteils und/oder der Einspritzventile handeln, so muß gewährleistet werden, daß die Brennkraftmaschine sicher zum Stehen kommt.If an error occurs in such a system, this may be, for example, a defect in the area of the control unit 170, the high-pressure part and / or the injection valves, it must be ensured that the internal combustion engine comes to a safe standstill.

Insbesondere bei Systemen, bei denen die Hochdruckpumpe 145 unmittelbar von der Brennkraftmaschine angetrieben wird, und damit die Hochdruckpumpe 145 bei laufender Brennkraftmaschine ständig weiterfördert, ist eine Abschaltung der Hochdruckpumpe 145 nicht möglich. Daher muß durch andere Maßnahmen gewährleistet werden, daß der Druck im Hochdruckteil schnell abgebaut und die Kraftstoffzufuhr unterbunden wird.In particular, in systems in which the high-pressure pump 145 is driven directly by the internal combustion engine, and thus the high-pressure pump 145 continues to deliver while the internal combustion engine is running, the high-pressure pump 145 cannot be switched off. Therefore, other measures must be taken to ensure that the pressure in the high-pressure section is quickly reduced and the fuel supply is cut off.

Insbesondere ist dies erforderlich, wenn im Hochdruckteil ein Leck auftritt und der Kraftstoff mit hohem Druck in den Motorraum austritt bzw. wenn Kraftstoff durch einen defekten Injektor mit hohem Druck permanent in einen Zylinder gelangt. In diesen Fällen muß der Druck im Hochdruckteil rasch abgebaut werden.This is particularly necessary if there is a leak in the high-pressure part and the fuel escapes into the engine compartment at high pressure or if fuel permanently enters a cylinder through a defective injector at high pressure. In these cases, the pressure in the high-pressure section must be released quickly.

Erfindungsgemäß wird nun wie folgt vorgegangen. Erkennt die Fehlerüberwachung 175 einen Fehler, so schaltet die Fehlerüberwachung 175 auf ein Notfahrprogramm um. Dies bedeutet, daß das Ventil 150 in seinen geschlossenen Zustand gebracht wird. Damit wird gewährleistet, daß kein weiterer Kraftstoff von der Pumpe 115 bereitgestellt wird. Als weitere bzw. als alternative Maßnahme werden die Magnetventile 140, 141, 142 und 143 derart angesteuert, daß sie die Kraftstoffzumessung in einer winkelstellung der Kurbelwelle freigeben, in der die Einspritzung keinen Beitrag zum Drehmoment der Brennkraftmaschine liefert. Besonders vorteilhaft ist es, wenn die Kraftstoffzumessung im Bereich des unteren Totpunktes freigegeben wird. Dies bedeutet die Kraftstoffzumessung erfolgt unmittelbar vor dem Öffnen der Auslaßventile der Brennkraftmaschine.The procedure according to the invention is now as follows. If the error monitor 175 detects an error, the error monitor 175 switches over to an emergency drive program. This means that the valve 150 is brought into its closed state. This ensures that no further fuel is provided by the pump 115. As further or as alternative measure, the solenoid valves 140, 141, 142 and 143 are controlled such that they release the fuel metering in an angular position of the crankshaft, in which the injection makes no contribution to the torque of the internal combustion engine. It is particularly advantageous if the fuel metering is released in the area of the bottom dead center. This means that the fuel is metered immediately before the exhaust valves of the internal combustion engine are opened.

Bei einer Ausgestaltung der Erfindung ist vorgesehen, daß lediglich die zweite Maßnahme durchgeführt wird. Bei dieser Ausführungsform kann das Ventil eingespart werden.In one embodiment of the invention it is provided that only the second measure is carried out. In this embodiment, the valve can be saved.

Die Kraftstoffzumessung erfolgt in einem möglichst großen Winkelbereich, damit die eingespritzte Menge einen größeren Wert annimmt als die Menge, die die Hochdruckpumpe 145 fördert. Durch diese Maßnahme wird zum einen der Druck im Hochdruckteil, insbesondere im Rail 135 rasch abgebaut und gleichzeitig kommt die Brennkraftmaschine zum stehen.The fuel is metered in the largest possible angular range so that the injected quantity assumes a larger value than the quantity that the high-pressure pump 145 delivers. On the one hand, this measure rapidly reduces the pressure in the high-pressure part, in particular in the rail 135, and at the same time the internal combustion engine comes to a standstill.

In Figur 2a sind die Winkelbereiche, bei denen die Kraftstoffzumessung üblicherweise erfolgt, über Grad Kurbelwelle aufgetragen. Üblicherweise erfolgt die Kraftstoffzumessung im Bereich des oberen Totpunktes OT des jeweiligen Zylinders. Die Dauer der Zumessung beträgt dabei zwischen 0° und 40° Kurbelwelle.In FIG. 2a, the angular ranges at which fuel metering is usually carried out are plotted using crankshaft degrees. The fuel is usually metered in the area of the top dead center TDC of the respective cylinder. The duration of the metering is between 0 ° and 40 ° crankshaft.

In Figur 2b sind die Verhältnisse im Fehlerfall aufgetragen. Die Einspritzung erfolgt nun im Bereich des unteren Totpunktes UT, wobei die Dauer der Einspritzung wesentlich länger ist als im Normalbetrieb.The situation in the event of a fault is plotted in FIG. 2b. The injection now takes place in the area of the bottom dead center UT, the duration of the injection being considerably longer than in normal operation.

Besonders vorteilhaft ist es, wenn im Fehlerfall die Dauer der Einspritzung so gewählt wird, daß die durch den Injektor strömende Kraftstoffmenge einen solchen Wert annimmt, daß die Durchflußbegrenzer ansprechen und dadurch die weitere Kraftstoffzufuhr zu den Zylindern unterbinden. Dabei ist die Menge, bei der die Durchflußbegrenzer ansprechen so zu wählen, daß bei dieser Menge keine Beschädigung der Brennkraftmaschine auftritt.It is particularly advantageous if, in the event of a fault, the duration of the injection is chosen so that the injection flowing fuel quantity assumes such a value that the flow limiters respond and thereby prevent further fuel supply to the cylinders. The amount at which the flow limiters respond should be selected so that no damage to the internal combustion engine occurs with this amount.

Besonders vorteilhaft ist es, daß wenn lediglich ein Injektor als defekt erkannt wurde, nur dieser Injektor derart angesteuert wird, das der diesem Injektor zugeordnete Durchflußbegrenzer den Kraftstofffluß unterbindet.It is particularly advantageous that if only one injector was identified as defective, only this injector is activated in such a way that the flow limiter assigned to this injector prevents the fuel flow.

Die Einspritzung zur Notabschaltung erfolgt vorzugsweise außerhalb des Verdichtungstaktes, das heißt, zwischen 0 Grad Kurbelwelle und 270 Grad Kurbelwelle. Als besonders günstig wurde der Winkelbereich von ca. 100° bis 200° Kurbelwelle nach dem oberen Totpunkt erkannt.The injection for emergency shutdown is preferably carried out outside the compression stroke, that is, between 0 degrees crankshaft and 270 degrees crankshaft. The angular range of approximately 100 ° to 200 ° crankshaft after top dead center was recognized as particularly favorable.

Claims (8)

Verfahren zur Steuerung einer Brennkraftmaschine, bei dem Kraftstoff von einer Pumpe in ein Hochdruckteil gefördert wird und die Zumessung von Kraftstoff in die einzelnen Zylinder mittels Magnetventilen steuerbar ist, dadurch gekennzeichnet, daß im Fehlerfall Kraftstoff in einem Winkelbereich zugemessen wird, in dem die Zumessung keinen Beitrag zum Drehmoment liefert.Method for controlling an internal combustion engine, in which fuel is pumped from a pump into a high-pressure part and the metering of fuel into the individual cylinders can be controlled by means of solenoid valves, characterized in that, in the event of a fault, fuel is metered in an angular range in which the metering makes no contribution to the torque. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß im Fehlerfall die Zumessung im Bereich des unteren Totpunktes des jeweiligen Zylinders erfolgt.Method according to Claim 1, characterized in that, in the event of a fault, the metering takes place in the region of the bottom dead center of the respective cylinder. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine solche Menge von Kraftstoff zugemessen wird, die einen Druckabfall im Hochdruckteil zur Folge hat.Method according to Claim 1 or 2, characterized in that an amount of fuel is metered in which results in a pressure drop in the high-pressure part. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine solche Menge von Kraftstoff zugemessen wird, bei der ein Durchflußbegrenzer im Hochdruckteil den Kraftstofffluß unterbindet.Method according to claim 1 or 2, characterized in that a quantity of fuel is metered in which a flow limiter in the high-pressure part prevents the fuel flow. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß lediglich dem Zylinder, dem ein Fehler zugeordnet wurde eine solche Menge von Kraftstoff zugemessen wird, bei der der Durchflußbegrenzer den Kraftstofffluß unterbindet.Method according to Claim 4, characterized in that only the cylinder to which a fault has been assigned is metered with such a quantity of fuel in which the flow restrictor prevents the fuel from flowing. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß im Fehlerfall eine längere Ansteuerdauer gewählt wird, als im Normalbetrieb.Method according to one of the preceding claims, characterized in that in the event of a fault, a longer activation period is selected than in normal operation. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Zumessung in einem Winkelbereich zwischen 100° und 200° Kurbelwelle nach dem oberen Totpunkt des jeweiligen Zylinders erfolgt.Method according to one of the preceding claims, characterized in that the metering takes place in an angular range between 100 ° and 200 ° crankshaft after the top dead center of the respective cylinder. Vorrichtung zur Steuerung einer Brennkraftmaschine, bei dem eine Pumpe Kraftstoff in einen Hochdruckteil fördert und das Magnetventile die Zumessung von Kraftstoff in die einzelnen Zylinder steuern, dadurch gekennzeichnet, daß Mittel vorgesehen sind, die im Fehlerfall Kraftstoff in einem Winkelbereich zumessen, in dem die Zumessung keinen Beitrag zum Drehmoment liefern.Device for controlling an internal combustion engine, in which a pump delivers fuel to a high-pressure part and the solenoid valves control the metering of fuel into the individual cylinders, characterized in that means are provided which, in the event of a fault, meter fuel in an angular range in which the metering does not Contribute to torque.
EP96110218A 1995-09-23 1996-06-25 Method and apparatus for controlling an internal combustion engine Expired - Lifetime EP0764777B1 (en)

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DE19535418 1995-09-23
DE19535418 1995-09-23
DE19605417 1996-02-14
DE19605417 1996-02-14

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EP0764777A3 EP0764777A3 (en) 1998-12-23
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JP (1) JP4071838B2 (en)
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FR2762358A1 (en) * 1997-04-16 1998-10-23 Peugeot Control of operation of diesel engine fitted to motor vehicle
EP0899443A2 (en) * 1997-08-29 1999-03-03 Isuzu Motors Limited A method and device for fuel injection for engines
EP1087121A2 (en) * 1999-09-22 2001-03-28 Adam Opel Ag Fuel injection control method for direct injection diesel engine
EP2071167A1 (en) * 2007-12-10 2009-06-17 Hitachi Ltd. High-pressure fuel supply apparatus and control apparatus for internal combustion engine
EP2123890A1 (en) * 2008-05-21 2009-11-25 GM Global Technology Operations, Inc. A method and system for controlling operating pressure in a common-rail fuel injection system, particularly for a diesel engine
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CN103052784A (en) * 2011-05-13 2013-04-17 丰田自动车株式会社 Internal combustion engine control apparatus

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FR2762358A1 (en) * 1997-04-16 1998-10-23 Peugeot Control of operation of diesel engine fitted to motor vehicle
EP0899443A2 (en) * 1997-08-29 1999-03-03 Isuzu Motors Limited A method and device for fuel injection for engines
EP0899443A3 (en) * 1997-08-29 2000-11-08 Isuzu Motors Limited A method and device for fuel injection for engines
EP1087121A2 (en) * 1999-09-22 2001-03-28 Adam Opel Ag Fuel injection control method for direct injection diesel engine
EP1087121A3 (en) * 1999-09-22 2003-05-02 Adam Opel Ag Fuel injection control method for direct injection diesel engine
US7735472B2 (en) 2007-12-10 2010-06-15 Hitachi, Ltd. High-pressure fuel supply apparatus and control apparatus for internal combustion engine
EP2071167A1 (en) * 2007-12-10 2009-06-17 Hitachi Ltd. High-pressure fuel supply apparatus and control apparatus for internal combustion engine
EP2123890A1 (en) * 2008-05-21 2009-11-25 GM Global Technology Operations, Inc. A method and system for controlling operating pressure in a common-rail fuel injection system, particularly for a diesel engine
US7891342B2 (en) 2008-05-21 2011-02-22 GM Global Technology Operations LLC Method and system for controlling operating pressure in a common-rail fuel injection system, particularly for a diesel engine
EP2187029A1 (en) * 2008-11-14 2010-05-19 Hitachi Automotive Systems Ltd. Control apparatus for internal combustion engine
CN101737185A (en) * 2008-11-14 2010-06-16 日立汽车系统株式会社 Control apparatus for internal combustion engine
US8240290B2 (en) 2008-11-14 2012-08-14 Hitachi Automotive Systems, Ltd. Control apparatus for internal combustion engine
CN101737185B (en) * 2008-11-14 2013-05-22 日立汽车系统株式会社 Control apparatus for internal combustion engine
CN103052784A (en) * 2011-05-13 2013-04-17 丰田自动车株式会社 Internal combustion engine control apparatus
CN103052784B (en) * 2011-05-13 2015-09-30 丰田自动车株式会社 The control gear of internal-combustion engine

Also Published As

Publication number Publication date
JPH09112319A (en) 1997-04-28
DE59610232D1 (en) 2003-04-24
JP4071838B2 (en) 2008-04-02
KR100413711B1 (en) 2004-03-30
EP0764777A3 (en) 1998-12-23
KR970016070A (en) 1997-04-28
EP0764777B1 (en) 2003-03-19
DE19636397A1 (en) 1997-03-27

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