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EP1442212A1 - Injection system comprising an emergency operation function and a corresponding emergency method - Google Patents

Injection system comprising an emergency operation function and a corresponding emergency method

Info

Publication number
EP1442212A1
EP1442212A1 EP02776875A EP02776875A EP1442212A1 EP 1442212 A1 EP1442212 A1 EP 1442212A1 EP 02776875 A EP02776875 A EP 02776875A EP 02776875 A EP02776875 A EP 02776875A EP 1442212 A1 EP1442212 A1 EP 1442212A1
Authority
EP
European Patent Office
Prior art keywords
pressure
control valve
control
pressure accumulator
injection system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02776875A
Other languages
German (de)
French (fr)
Other versions
EP1442212B1 (en
Inventor
Sebastian PÖTZEL
Gerhard Eser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1442212A1 publication Critical patent/EP1442212A1/en
Application granted granted Critical
Publication of EP1442212B1 publication Critical patent/EP1442212B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • 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
    • F02D41/22—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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the 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
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F02D2200/0604—Estimation of fuel pressure

Definitions

  • the present invention relates to an injection system for internal combustion engines with an emergency operation function and a method for maintaining emergency operation of such an injection system.
  • valve can branch off part of the fuel flow conveyed by the high-pressure pump and return it to a low-pressure area of the injection system when the desired fuel pressure is reached or exceeded.
  • the valve forwards the entire fuel flow delivered by the high-pressure pump to the pressure accumulator in order to achieve the desired pressure level in the pressure accumulator again as quickly as possible.
  • the valve arranged between the high-pressure pump and the pressure accumulator thus enables the fuel pressure prevailing in the pressure accumulator to be set, so that this valve is controlled by a control unit in accordance with the quantity of fuel to be injected.
  • the injection system according to the invention for an internal combustion engine comprises a pump, a pressure accumulator, a sensor for detecting the pressure in the pressure accumulator, a control valve arranged between the pump and the pressure accumulator, and a control unit.
  • the control valve can open or close a connection to a low pressure area.
  • the pressure in the pressure accumulator is regulated.
  • the control valve remains closed when the pressure in the pressure accumulator has not yet reached the desired value or the control valve is opened when the pressure 0 in the pressure accumulator exceeds a predetermined threshold value in order to discharge fuel from the high pressure area to the low pressure area.
  • the control or regulating unit is designed in such a way that when a fault occurs in the regulating circuit for regulating the pressure level in the pressure accumulator 5, it opens the regulating valve and thereby ensures an emergency operation function of the injection system. During the emergency operation, the pump continues to operate, which thereby continues Feeds fuel into the pressure accumulator. Despite the control valve opened in emergency operation and thus a connection to the low-pressure area, this quantity delivered is large enough to enable emergency operation of the internal combustion engine, since the opened control valve acts as a throttle. Thus, the invention takes place according to a control of the pump even in the presence of an error in the control loop for the pressure levels ⁇ control.
  • the control valve is preferably designed as an electrically operated volume control valve.
  • a coil of the electrical volume control valve is particularly preferably de-energized so that the volume control valve is open.
  • a valve closing body of the control valve is advantageously designed in such a way that it opens a passage in the direction of the pressure accumulator starting from a low pressure area.
  • the valve closing body is moved to open the passage in the suction direction when the pump draws the fuel through the control valve.
  • control valve In emergency operation mode, the control valve is preferably brought into its open position in the event of a sensor failure or a short circuit or an open circuit or a short circuit.
  • a non-return valve is arranged in the accumulator and fuel is sucked in through the control valve.
  • the pump is thus arranged in the fluid path between the control valve and the check valve.
  • the actuation of the control valve is also synchronized with the piston stroke of a pump designed as a single piston pump.
  • a separate inlet check valve is preferably provided, which is connected in parallel with the control valve, so that fuel is drawn in from the low-pressure region through the inlet check valve or both valves.
  • a control valve which can release or close a connection between an outlet-side area of a pump and a low-pressure area is opened by a control or control unit open if an error occurs in the pressure control of the pressure level in the pressure accumulator. This opening of the control valve when a fault occurs in the control circuit for regulating the pressure level in a pressure accumulator.
  • a fault in the control loop enables emergency operation, since the pump continues to be actuated so that it continues to deliver fuel to the pressure accumulator.
  • a certain fuel pressure can be built up in the pressure accumulator because the opened control valve acts as a throttle and the volume flow supplied by the pump is up to a certain pressure level greater than the volume flow flowing out through the opened control valve.
  • the pressure level of the pressure built up in emergency operation in the pressure accumulator depends on the amount of fuel injected by the injectors and on the engine speed. It is thus possible according to the invention that, for example, if a fault occurs, a vehicle can continue to drive into a workshop under its own power in emergency operation.
  • the method according to the invention is preferably carried out when an error occurs as a result of a short circuit, a line Interruption or a short circuit of a valve coil, the control valve is preferably designed as a volume-controlled solenoid valve.
  • An emergency operation function according to the invention is also possible if the error is a failure of a sensor for determining the pressure in the pressure accumulator.
  • a value of the pressure in the pressure accumulator is preferably determined from a map as a function of the engine speed and the amount of fuel injected.
  • a pressure value can be obtained even if the pressure sensor fails and in the control or. Control unit are processed.
  • power and speed limitation is advantageously active even during emergency operation, which can prevent misfires.
  • Figure 1 is a schematic representation of an injection system according to an embodiment of the present invention.
  • Figure 2 is a schematic representation of a map during emergency operation.
  • FIG. 1 shows a schematic structure of an injection system according to an exemplary embodiment of the present invention.
  • the injection system comprises a volume flow-controlled high-pressure pump 1, which is designed as a single-piston pump. Furthermore, a pressure accumulator 3 is provided, in which fuel is at a high level
  • Pressure is stored and passed to individual injectors 4, via which an injection of Fuel takes place in the combustion chambers of an internal combustion engine.
  • a control valve 2 is provided, which is designed as an electrically actuable volume control valve.
  • a pressure sensor 7 is provided on the pressure accumulator 3 for recording the pressure actually prevailing in the pressure accumulator 3.
  • the injection system includes a control or Control unit 8, which controls the control valve 2 in particular.
  • the control valve 2 is arranged between a low-pressure region 6 and the pressure accumulator 3, it being connected to the pressure accumulator 3 via a line 11.
  • a check valve 5 is arranged in front of the pressure accumulator 3 to prevent fuel from flowing back from the pressure accumulator 3 into the line 11.
  • the pump 1 is hydraulically arranged via a branch line 9 between the control valve 2 and the check valve 5 (see FIG. 1) and draws fuel from the low-pressure line ⁇ through the control valve 2. Pump 1 thus works as a plunger pump.
  • the control valve 2 is designed as an outward opening valve, i.e. The stroke of the control valve 2 takes place starting from the closed valve in the direction of the line 11, and closes or opens a passage 10 between the low-pressure line 6 and the line 11. That the direction of the opening stroke of the control valve 2 is equal to the direction of flow of the fuel during the intake through the control valve.
  • the function of the injection system according to the invention is described below.
  • the high-pressure pump 1 draws fuel from the low-pressure line 6 through the passage 10, which is opened by the control valve 2. Since the high-pressure pump is a single-piston pump, the control of the control valve 2 is synchronized with the piston stroke in order to have the lowest possible losses. If the
  • the control valve 2 closes the passage 10 so that fuel is fed into the pressure accumulator 3 via the check valve 5.
  • the fuel is guided in a known manner from the pressure accumulator 3 to injectors 4, which inject the fuel into combustion chambers of the internal combustion engine.
  • a predetermined pressure should always be present in the pressure accumulator 3. This is detected by means of the pressure sensor 7, which emits corresponding signals to the control or regulating unit 8.
  • fuel delivery by the piston pump is reduced (e.g. by reducing the drive speed) or prevented or the control valve 2 is controlled accordingly and also opened during the pressure stroke of the pump 1, so that fuel from the line 11 back to the low pressure area flows.
  • control or regulating unit 8 is designed such that if a fault occurs in the regulating circuit, the regulating valve 2 is actuated in such a way that it is constantly open, so that a permanent connection between the line 11 and the Low pressure area 6 is present. Since the control valve 2 is designed as an electric valve, the open position can be achieved simply by de-energizing the coil of the valve 2.
  • control valve 2 is designed as an outward opening valve, the valve closing body can move freely when the coil is de-energized, so that after the suction stroke of the piston pump 1 has been completed, the passage 10 is closed due to the pressure build-up in the line 11 and
  • Fuel can be fed into the pressure accumulator 3 (see FIG. 1).
  • the pressure build-up in the pressure accumulator 3 during emergency operation is supported by the freely movable valve closing body 13 by closing the passage 10 during the pressure stroke, as a result of which higher pressures in the pressure accumulator 3 are possible.
  • the error in the control circuit can be in particular in the area of the control valve 2, such as, for example, due to a short circuit, an open circuit or a turn of the valve coil, or an error in the pressure sensor 7, so that no signals from the pressure sensor 7 Control unit 8 can be supplied.
  • the pressure prevailing in emergency operation in the pressure accumulator 3 can be determined, for example, from a map as shown schematically in FIG. 2 as a function of the engine speed and the amount of fuel injected by the injectors 4. The value obtained in this way can therefore be processed further by the control unit 8. For this purpose, such a map only has to be stored in advance in a memory for the control unit.
  • an injection system with a simply constructed emergency operation is thus provided.
  • the limp-home operation can be maintained by designing the control and regulating unit 8, which is designed such that it opens the regulating valve 2 when a fault occurs in the regulating circuit for regulating the pressure level in the pressure accumulator 3.
  • the pump 1 can still convey a volume flow into the pressure accumulator 3 and even build up a low pressure there, which enables emergency operation of the internal combustion engine.
  • FIG. 1 A further variant of the injection system according to the invention is also shown in broken lines in FIG.
  • an inlet check valve 12 can be provided parallel to the control valve 2, via which the piston pump sucks in fuel from the low-pressure region 6.
  • the control valve 2 can also be designed as a valve opening in the direction of the low-pressure region.
  • the high-pressure pump can not only be designed as a single-piston pump, but that multi-piston pumps can also be used.
  • the present invention thus relates to an injection system for an internal combustion engine with a pump 1, a pressure accumulator 3, a sensor 7 for detecting the pressure in the pressure accumulator 3, a control valve 2 and a control or regulating unit 8.
  • the control or regulating unit 8 regulates the pressure in the pressure accumulator 3 by releasing or closing a connection to a low-pressure area 6.
  • the Steuer max. The control unit has an emergency operation control in such a way that the control valve is set to its open position when an error occurs in the control circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to an injection system for an internal combustion engine comprising a pump (1), a pressure accumulator (3), a sensor (7) for detecting the pressure in the pressure accumulator (3), a control valve (2) and a control or regulation unit (8). Said control or regulation unit controls the pressure in the pressure accumulator (3) by opening or closing a connection to a low-pressure area (6). The control or regulation unit has an emergency operation function, which operates in such a way that when an error occurs in the regulator circuit, the control valve adopts the open position.

Description

Beschreibungdescription

Einspritzanlage mit Notlauffunktion sowie zugehöriges Not¬ laufverfahrenContinuous process injection system with emergency function and associated distress ¬

Die vorliegende Erfindung betrifft eine Einspritzanlage für Brennkraftmaschinen mit einer Notlauffunktion sowie ein Verfahren zur Aufrechterhaltung eines Notlaufbetriebes einer derartigen Einspritzanlage.The present invention relates to an injection system for internal combustion engines with an emergency operation function and a method for maintaining emergency operation of such an injection system.

Bei modernen Brennkraftmaschinen werden häufig Speichereinspritzanlagen verwendet, welche zur Speicherung eines unter Druck stehenden Kraftstoffes einen Druckspeicher aufweisen. Aus diesem Druckspeicher werden die den einzelnen Brennräumen der Brennkraftmaschine zugeordneten Injektoren mit Kraftstoff versorgt. Die Kraftstoffzufuhr zu dem Druckspeicher erfolgt dabei über eine Hochdruckpumpe, die über ein steuerbares Ventil mit dem Druckspeicher verbunden ist, wobei das zwischen der Hochdruckpumpe und dem Druckspeicher angeordnete Ventil eine Einstellung des in dem Druckspeicher herrschenden Kraftstoffdrucks ermöglicht. So kann das Ventil beispielsweise ein Teil des von der Hochdruckpumpe geförderten KraftstoffStroms abzweigen und in einen Niederdruckbereich der Einspritzanlage zurückführen, wenn der gewünschte Kraftstoffdruck erreicht oder überschritten ist. Bei einem Unterschreiten des gewünschten Kraftstoffdrucks im Druckspeicher leitet das Ventil dagegen den gesamten von der Hochdruckpumpe geförderten Kraftstoffstrom zum Druckspeicher weiter, um möglichst schnell wieder das gewünschte Druckniveau im Druckspeicher zu erreichen. Das zwischen der Hochdruckpumpe und dem Druckspeicher angeordnete Ventil ermöglicht somit eine Einstellung des im Druckspeicher herrschenden Kraftstoffdrucks, so dass dieses Ventil von einer Steuereinheit entsprechend der einzuspritzenden Kraftstoffmenge angesteuert wird.In modern internal combustion engines, storage injection systems are often used which have a pressure accumulator for storing a fuel under pressure. The injectors assigned to the individual combustion chambers of the internal combustion engine are supplied with fuel from this pressure accumulator. The fuel supply to the pressure accumulator takes place via a high-pressure pump, which is connected to the pressure accumulator via a controllable valve, the valve arranged between the high-pressure pump and the pressure accumulator making it possible to adjust the fuel pressure prevailing in the pressure accumulator. For example, the valve can branch off part of the fuel flow conveyed by the high-pressure pump and return it to a low-pressure area of the injection system when the desired fuel pressure is reached or exceeded. If the desired fuel pressure in the pressure accumulator is not reached, the valve, on the other hand, forwards the entire fuel flow delivered by the high-pressure pump to the pressure accumulator in order to achieve the desired pressure level in the pressure accumulator again as quickly as possible. The valve arranged between the high-pressure pump and the pressure accumulator thus enables the fuel pressure prevailing in the pressure accumulator to be set, so that this valve is controlled by a control unit in accordance with the quantity of fuel to be injected.

Bei den bisher bekannten Einspritzanlagen wird bei Auftreten eines Fehlers im Regelkreis zur Regelung der Druckhöhe im Druckspeicher die Kraftstoffförderung ausgesetzt und der Betrieb der Brennkraftmaschine beendet. Es wäre jedoch wünschenswert, wenn eine Notlauffunktion vorhanden wäre, um einen Notbetrieb der Brennkraftmaschine auch bei Auftreten ei- 5. nes Fehlers im Regelkreis der Druckhöhenregelung im Druckspeicher fortführen zu können.In the injection systems known hitherto, when an error occurs in the control circuit for regulating the pressure level in the Pressure accumulator suspended the fuel delivery and the operation of the internal combustion engine ended. However, it would be desirable if an emergency operation function were available in order to be able to continue an emergency operation of the internal combustion engine even if an error occurred in the 5. control loop of the pressure level control in the pressure accumulator.

Es ist daher Aufgabe der vorliegenden Erfindung, eine Einspritzanlage für eine Brennkraftmaschine bereitzustellen, 0 welche einen Notlaufbetrieb ermöglicht sowie ein Verfahren zur Aufrechterhaltung eines Notlaufbetriebes bereitstellt.It is therefore an object of the present invention to provide an injection system for an internal combustion engine which enables emergency operation and provides a method for maintaining emergency operation.

Diese Aufgabe wird durch eine Einspritzanlage mit den Merkmalen des Patentanspruchs 1 bzw. ein Verfahren mit den Merk- 5 malen des Patentanspruchs 9 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind jeweils in den Unteransprüchen angegeben.This object is achieved by an injection system with the features of patent claim 1 or a method with the features of patent claim 9. Advantageous developments of the invention are specified in the subclaims.

Die erfindungsgemäße Einspritzanlage für eine Brennkraft- 0 maschine umfasst eine Pumpe, einen Druckspeicher, einen Sensor zur Erfassung des Druckes im Druckspeicher, ein zwischen der Pumpe und dem Druckspeicher angeordnetes Regelventil und eine Steuer- bzw. Regeleinheit. Das Regelventil kann eine Verbindung zu einem Niederdruckbereich freigeben bzw. ver- 5 schließen. Durch Ansteuern des Regelventils mittels der Steuer- bzw. Regeleinheit wird somit der Druck im Druckspeicher geregelt. Dabei bleibt das Regelventil geschlossen, wenn der Druck im Druckspeicher noch nicht den gewünschten Wert erreicht hat bzw. das Regelventil wird geöffnet, wenn der Druck 0 im Druckspeicher einen vorgegebenen Schwellenwert überschreitet, um Kraftstoff aus dem Hochdruckbereich in den Niederdruckbereich abzulassen. Die Steuer- bzw. Regeleinheit ist dabei derart ausgebildet, dass sie bei Auftreten eines Fehlers im Regelkreis zur Druckhöhenregelung im Druckspeicher 5 das Regelventil öffnet und dadurch eine Notlauffunktion der Einspritzanlage sicherstellt. Während des Notlaufbetriebes wird dabei die Pumpe weiter betrieben, welche dadurch weiter Kraftstoff in den Druckspeicher fördert. Diese geförderte Menge ist trotz des im Notlaufbetrieb geöffneten Regelventils und damit einer Verbindung zum Niederdruckbereich groß genug, um einen Notlaufbetrieb der Brennkraftmaschine zu er ög- liehen, da das geöffnete Regelventil als Drossel wirkt. Somit erfolgt erfindungsgemäß eine Ansteuerung der Pumpe auch bei Vorhandensein eines Fehlers im Regelkreis zur Druckhöhen¬ regelung.The injection system according to the invention for an internal combustion engine comprises a pump, a pressure accumulator, a sensor for detecting the pressure in the pressure accumulator, a control valve arranged between the pump and the pressure accumulator, and a control unit. The control valve can open or close a connection to a low pressure area. By controlling the control valve by means of the control or regulating unit, the pressure in the pressure accumulator is regulated. The control valve remains closed when the pressure in the pressure accumulator has not yet reached the desired value or the control valve is opened when the pressure 0 in the pressure accumulator exceeds a predetermined threshold value in order to discharge fuel from the high pressure area to the low pressure area. The control or regulating unit is designed in such a way that when a fault occurs in the regulating circuit for regulating the pressure level in the pressure accumulator 5, it opens the regulating valve and thereby ensures an emergency operation function of the injection system. During the emergency operation, the pump continues to operate, which thereby continues Feeds fuel into the pressure accumulator. Despite the control valve opened in emergency operation and thus a connection to the low-pressure area, this quantity delivered is large enough to enable emergency operation of the internal combustion engine, since the opened control valve acts as a throttle. Thus, the invention takes place according to a control of the pump even in the presence of an error in the control loop for the pressure levels ¬ control.

Vorzugsweise ist das Regelventil als ein elektrisch betriebenes Volumensteuerventil ausgebildet. Besonders bevorzugt wird dabei bei Auftreten eines Fehlers eine Spule des elektrischen Volumensteuerventils stromlos geschaltet, so dass das Volumensteuerventil geöffnet ist.The control valve is preferably designed as an electrically operated volume control valve. When a fault occurs, a coil of the electrical volume control valve is particularly preferably de-energized so that the volume control valve is open.

Um einen möglichst hohen Druck im Notlaufbetrieb zu erreichen, ist vorteilhaft ein Ventilschließkörper des Regelventils derart ausgebildet, dass er ausgehend von einem Niederdruckbereich einen Durchlass in Richtung des Druck- Speichers öffnet. Mit anderen Worten wird der Ventilschließkörper zur Öffnung des Durchlasses in Ansaugrichtung bewegt, wenn die Pumpe den Kraftstoff durch das Regelventil ansaugt.In order to achieve the highest possible pressure in emergency operation, a valve closing body of the control valve is advantageously designed in such a way that it opens a passage in the direction of the pressure accumulator starting from a low pressure area. In other words, the valve closing body is moved to open the passage in the suction direction when the pump draws the fuel through the control valve.

Vorzugsweise wird das Regelventil im Notlaufbetrieb bei Auf- treten eines Ausfalls des Sensors oder eines Kurzschlusses oder einer Leitungsunterbrechung oder eines Windungsschlusses in seine Offenstellung gebracht.In emergency operation mode, the control valve is preferably brought into its open position in the event of a sensor failure or a short circuit or an open circuit or a short circuit.

Um einen möglichst: einfachen und kompakten Aufbau der Ein- Spritzanlage zu gewährleisten, ist vorzugsweise vor demIn order to ensure that the injection system is simple and compact, it is preferable to use the

Druckspeicher ein Rückschlagventil angeordnet und eine Ansaugung von Kraftstoff erfolgt dabei durch das Regelventil. Somit ist die Pumpe im Fluidweg zwischen dem Regelventil und dem Rückschlagventil angeordnet. Vorzugsweise ist weiterhin die Betätigung des Regelventils mit dem Kolbenhub einer als Einkolbenpu pe ausgebildeten Pumpe synchronisiert.A non-return valve is arranged in the accumulator and fuel is sucked in through the control valve. The pump is thus arranged in the fluid path between the control valve and the check valve. Preferably, the actuation of the control valve is also synchronized with the piston stroke of a pump designed as a single piston pump.

Gemäß einer bevorzugten Ausgestaltung der vorliegenden Erfindung ist vorzugsweise ein separates Einlassrückschlagventil vorhanden, welches zum Regelventil parallel geschaltet ist, so dass eine Ansaugung von Kraftstoff aus dem Niederdruckbereich durch das Einlassrückschlagventil oder beide Ventile erfolgt.According to a preferred embodiment of the present invention, a separate inlet check valve is preferably provided, which is connected in parallel with the control valve, so that fuel is drawn in from the low-pressure region through the inlet check valve or both valves.

Gemäß dem erfindungsgemäßen Verfahren zur Aufrechterhaltung eines Notlaufbetriebs einer Brennkraftmaschine wird bei Auftreten eines Fehlers im Regelkreis zur Regelung der- Druckhöhe in einem Druckspeicher ein Regelventil, welches eine Verbindung zwischen einem ausgangsseitigen Bereich einer Pumpe und einem Niederdruckbereich freigeben bzw. verschließen kann, durch eine Steuer- bzw. Regeleinheit geöffnet, wenn ein Fehler bei der Druckregelung der Druckhöhe im Druckspeicher auf- tritt. Dieses Öffnen des Regelventils bei Auftreten einesAccording to the method according to the invention for maintaining emergency operation of an internal combustion engine, if a fault occurs in the control circuit for regulating the pressure level in a pressure accumulator, a control valve which can release or close a connection between an outlet-side area of a pump and a low-pressure area is opened by a control or control unit open if an error occurs in the pressure control of the pressure level in the pressure accumulator. This opening of the control valve when a

Fehlers im Regelkreis ermöglicht einen Notbetrieb, da dabei die Pumpe weiter angesteuert wird, so dass sie weiter Kraftstoff in den Druckspeicher fördert. Dabei kann ein gewisser Kraftstoffdruck im Druckspeicher aufgebaut werden, da das ge- öffnete Regelventil als Drossel wirkt und der durch die Pumpe zugeführte Volumenstrom bis zu einem bestimmten Druckniveau größer ist als der durch das geöffnete Regelventil abströmende Volumenstrom. Die Druckhöhe des im Notlaufbetrieb aufgebauten Druckes im Druckspeicher hängt dabei von der durch die Injektoren eingespritzen Kraftstoffmenge und von der Motordrehzahl ab. Somit ist es erfindungsgemäß möglich, dass beispielsweise ein Fahrzeug bei Auftreten eines Fehlers aus eigener Kraft im Notlaufbetrieb in eine Werkstatt weiterfahren kann.A fault in the control loop enables emergency operation, since the pump continues to be actuated so that it continues to deliver fuel to the pressure accumulator. A certain fuel pressure can be built up in the pressure accumulator because the opened control valve acts as a throttle and the volume flow supplied by the pump is up to a certain pressure level greater than the volume flow flowing out through the opened control valve. The pressure level of the pressure built up in emergency operation in the pressure accumulator depends on the amount of fuel injected by the injectors and on the engine speed. It is thus possible according to the invention that, for example, if a fault occurs, a vehicle can continue to drive into a workshop under its own power in emergency operation.

Das erfindungsgemäße Verfahren wird vorzugsweise bei Auftreten eines Fehlers infolge eines Kurzschlusses, einer Lei- tungsunterbrechung oder eines Windungsschlusses einer Ventilspule ausgeführt, wobei das Regelventil bevorzugt als volumengesteuertes Elektroventil ausgebildet ist.The method according to the invention is preferably carried out when an error occurs as a result of a short circuit, a line Interruption or a short circuit of a valve coil, the control valve is preferably designed as a volume-controlled solenoid valve.

Eine erfindungsgemäße Notlauffunktion ist ebenfalls möglich, wenn der Fehler ein Ausfall eines Sensors zur Bestimmung des Druckes im Druckspeicher ist.An emergency operation function according to the invention is also possible if the error is a failure of a sensor for determining the pressure in the pressure accumulator.

Weiterhin wird bei dem erfindungsgemäßen Verfahren vorzugs- weise ein Wert des Drucks im Druckspeicher aus einem Kennfeld in Abhängigkeit von der Motordrehzahl und der eingespritzten Kraftstoffmenge bestimmt. Somit kann ein Druckwert auch bei Ausfall des Drucksensors erhalten werden und in der Steuerbzw. Regeleinheit verarbeitet werden. Insbesondere ist dabei vorteilhaft eine Leistungs- und Drehzahlbegrenzung auch während des Notlaufbetriebes aktiv, wodurch Zündaussetzer verhindert werden können.Furthermore, in the method according to the invention, a value of the pressure in the pressure accumulator is preferably determined from a map as a function of the engine speed and the amount of fuel injected. Thus, a pressure value can be obtained even if the pressure sensor fails and in the control or. Control unit are processed. In particular, power and speed limitation is advantageously active even during emergency operation, which can prevent misfires.

Nachfolgend wird die Erfindung anhand eines bevorzugten Aus- führungsbeispiels in Verbindung mit der Zeichnung beschrieben. In der Zeichnung ist:The invention is described below on the basis of a preferred exemplary embodiment in conjunction with the drawing. In the drawing is:

Figur 1 eine schematische Darstellung einer Einspritzanlage gemäß einem Ausführungsbeispiel der vorliegenden Erfindung undFigure 1 is a schematic representation of an injection system according to an embodiment of the present invention and

Figur 2 eine schematische Darstellung eines Kennfelds während eines Notlaufbetriebs .Figure 2 is a schematic representation of a map during emergency operation.

In Figur 1 ist ein schematischer Aufbau einer Einspritzanlage gemäß einem Ausführungsbeispiel der vorliegenden Erfindung dargestellt ..Wie in Figur 1 gezeigt, umfasst die Einspritz- • anläge eine volumenstromgesteuerte Hochdruckpumpe 1, welche als Einkolbenpumpe ausgebildet ist. Weiterhin ist ein Druck- Speicher 3 vorgesehen, in welchem Kraftstoff unter hohemFIG. 1 shows a schematic structure of an injection system according to an exemplary embodiment of the present invention. As shown in FIG. 1, the injection system comprises a volume flow-controlled high-pressure pump 1, which is designed as a single-piston pump. Furthermore, a pressure accumulator 3 is provided, in which fuel is at a high level

Druck gespeichert wird und zu einzelnen Injektoren 4 geleitet wird, über welche in bekannter Weise eine Einspritzung von Kraftstoff in Brennräume einer Brennkraftmaschine erfolgt. Weiterhin ist ein Regelventil 2 vorgesehen, welches als e- lektrisch betätigbares Volumensteuerventil ausgebildet ist. Am Druckspeicher 3 ist ein Drucksensor 7 zur Aufnahme des tatsächlich herrschenden Druckes im Druckspeicher 3 vorgesehen. Weiterhin umfasst die Einspritzanlage eine Steuerbzw. Regeleinheit 8, welche insbesondere das Regelventil 2 steuert.Pressure is stored and passed to individual injectors 4, via which an injection of Fuel takes place in the combustion chambers of an internal combustion engine. Furthermore, a control valve 2 is provided, which is designed as an electrically actuable volume control valve. A pressure sensor 7 is provided on the pressure accumulator 3 for recording the pressure actually prevailing in the pressure accumulator 3. Furthermore, the injection system includes a control or Control unit 8, which controls the control valve 2 in particular.

Das Regelventil 2 ist zwischen einem Niederdruckbereich 6 und dem Druckspeicher 3 angeordnet, wobei es mit dem Druckspeicher 3 über eine Leitung 11 verbunden ist. In dieser Leitung 11 ist vor dem Druckspeicher 3 noch ein Rückschlagventil 5 zur Verhinderung eines Rückflusses von Kraftstoff aus dem Druckspeicher 3 in die Leitung 11 angeordnet. Die Pumpe 1 ist über eine Abzweigleitung 9 hydraulisch zwischen dem Regelventil 2 und dem Rückschlagventil 5 angeordnet (vgl. Figur 1) und saugt Kraftstoff aus der Niederdruckleitung β durch das Regelventil 2 an. Somit arbeitet die Pumpe 1 als Plungerpum- pe. Das Regelventil 2 ist als nach außen öffnendes Ventil ausgebildet, d.h. der Hub des Regelventils 2 erfolgt ausgehend vom geschlossenen Ventil in Richtung der Leitung 11, und verschließt bzw. gibt einen Durchlass 10 zwischen der Niederdruckleitung 6 und der Leitung 11 frei. D.h. die Richtung des Offnungshubs des Regelventils 2 ist gleich der Strömungsrichtung des Kraftstoffs während der Ansaugung durch das Regelventil.The control valve 2 is arranged between a low-pressure region 6 and the pressure accumulator 3, it being connected to the pressure accumulator 3 via a line 11. In this line 11, a check valve 5 is arranged in front of the pressure accumulator 3 to prevent fuel from flowing back from the pressure accumulator 3 into the line 11. The pump 1 is hydraulically arranged via a branch line 9 between the control valve 2 and the check valve 5 (see FIG. 1) and draws fuel from the low-pressure line β through the control valve 2. Pump 1 thus works as a plunger pump. The control valve 2 is designed as an outward opening valve, i.e. The stroke of the control valve 2 takes place starting from the closed valve in the direction of the line 11, and closes or opens a passage 10 between the low-pressure line 6 and the line 11. That the direction of the opening stroke of the control valve 2 is equal to the direction of flow of the fuel during the intake through the control valve.

Nachfolgend wird die Funktion der erfindungsgemäßen Ein- Spritzanlage beschrieben. Die Hochdruckpumpe 1 saugt Kraftstoff aus der Niederdruckleitung 6 durch den Durchlass 10, welcher vom Regelventil 2 geöffnet ist, an. Da es sich bei der Hochdruckpumpe um eine Einkolbenpumpe handelt, ist die Ansteuerung des Regelventils 2 mit dem Kolbenhub synchroni- siert, um möglichst geringe Verluste aufzuweisen. Wenn dieThe function of the injection system according to the invention is described below. The high-pressure pump 1 draws fuel from the low-pressure line 6 through the passage 10, which is opened by the control valve 2. Since the high-pressure pump is a single-piston pump, the control of the control valve 2 is synchronized with the piston stroke in order to have the lowest possible losses. If the

Ansaugung beendet ist und sich die Bewegungsrichtung des Kolbens der Kolbenpumpe 1 umkehrt, schließt das Regelventil 2 den Durchlass 10, so dass Kraftstoff über das Rückschlagventil 5 in den Druckspeicher 3 geführt wird. Vom Druckspeicher 3 wird der Kraftstoff in bekannter Weise zu Injektoren 4 geführt, welche den Kraftstoff in Brennräume der Brennkraftmaschine einspritzen. Dabei soll ein vorbestimmter Druck im Druckspeicher 3 ständig vorhanden sein. Dies wird mittels des Drucksensors 7 erfasst, welcher entsprechende Signale an die Steuer- bzw. Regeleinheit 8 abgibt. Entsprechend dem im Druckspeicher 3 herrschenden Druckniveau wird eine Kraftstoffförderung durch die Kolbenpumpe vermindert (z.B. durch Reduzierung der Antriebsdrehzahl) oder unterbunden bzw. das Regelventil 2 entsprechend angesteuert und auch während des Druckhubes der Pumpe 1 geöffnet, so dass Kraftstoff von der Leitung 11 zurück zum Niederdruckbereich strömt.Suction is ended and the direction of movement of the piston of the piston pump 1 reverses, the control valve 2 closes the passage 10 so that fuel is fed into the pressure accumulator 3 via the check valve 5. The fuel is guided in a known manner from the pressure accumulator 3 to injectors 4, which inject the fuel into combustion chambers of the internal combustion engine. A predetermined pressure should always be present in the pressure accumulator 3. This is detected by means of the pressure sensor 7, which emits corresponding signals to the control or regulating unit 8. According to the pressure level prevailing in the pressure accumulator 3, fuel delivery by the piston pump is reduced (e.g. by reducing the drive speed) or prevented or the control valve 2 is controlled accordingly and also opened during the pressure stroke of the pump 1, so that fuel from the line 11 back to the low pressure area flows.

Um einen Notlaufbetrieb der Einspritzanlage zu ermöglichen, ist die Steuer- bzw. Regeleinheit 8 derart ausgebildet, dass bei Auftreten eines Fehlers im Regelkreis das Regelventil 2 derart angesteuert wird, dass es ständig geöffnet ist, so dass eine ständige Verbindung zwischen der Leitung 11 und dem Niederdruckbereich 6 vorhanden ist. Da das Regelventil 2 als Elektroventil ausgebildet ist, kann die Offenstellung einfach durch Stromlosstellen der Spule des Ventils 2 erreicht werden.In order to enable emergency operation of the injection system, the control or regulating unit 8 is designed such that if a fault occurs in the regulating circuit, the regulating valve 2 is actuated in such a way that it is constantly open, so that a permanent connection between the line 11 and the Low pressure area 6 is present. Since the control valve 2 is designed as an electric valve, the open position can be achieved simply by de-energizing the coil of the valve 2.

Da weiterhin das Regelventil 2 als nach außen öffnendes Ventil ausgebildet ist, ist bei stromlos gestellter Spule der Ventilschließkörper frei beweglich, so dass nach Abschluss des Ansaughubes der Kolbenpumpe 1 der Durchlass 10 infolge des Druckaufbaus in der Leitung 11 verschlossen wird undFurthermore, since the control valve 2 is designed as an outward opening valve, the valve closing body can move freely when the coil is de-energized, so that after the suction stroke of the piston pump 1 has been completed, the passage 10 is closed due to the pressure build-up in the line 11 and

Kraftstoff in den Druckspeicher 3 gefördert werden kann (vgl. Figur 1) . Somit wird der Druckaufbau im Druckspeicher 3 während des Notlaufbetriebs durch den frei beweglichen Ventilschließkörper 13 durch Verschließen des Durchlasses 10 wäh- rend des Druckhubes noch unterstützt, wodurch höhere Drücke im Druckspeicher 3 möglich sind. Es sei angemerkt, dass der Fehler im Regelkreis insbesondere im Bereich des Regelventils 2 sein kann, wie beispielsweise durch einen Kurzschluss, eine Leitungsunterbrechung oder einen Windungsschluss der Ventilspule, oder in einem Fehler im Drucksensor 7 liegen kann, so dass keine Signale vom Drucksensor 7 zur Steuer- bzw. Regeleinheit 8 geliefert werden können.Fuel can be fed into the pressure accumulator 3 (see FIG. 1). Thus, the pressure build-up in the pressure accumulator 3 during emergency operation is supported by the freely movable valve closing body 13 by closing the passage 10 during the pressure stroke, as a result of which higher pressures in the pressure accumulator 3 are possible. It should be noted that the error in the control circuit can be in particular in the area of the control valve 2, such as, for example, due to a short circuit, an open circuit or a turn of the valve coil, or an error in the pressure sensor 7, so that no signals from the pressure sensor 7 Control unit 8 can be supplied.

Bei Ausfall des Drucksensors 7 kann der im Notlaufbetrieb herrschende Druck im Druckspeicher 3 beispielsweise aus einem wie in Figur 2 schematisch dargestellten Kennfeld abhängig von der Motordrehzahl und der durch die Injektoren 4 eingespritzten Kraftstoffmenge bestimmt werden. Der so erhaltene Wert kann von der Steuer- bzw. Regeleinheit 8 demnach weiter verarbeitet werden. Hierzu muß ein derartiges Kennfeld nur in einem Speicher für die Steuer- bzw. Regeleinheit im Voraus' abgespeichert sein.If the pressure sensor 7 fails, the pressure prevailing in emergency operation in the pressure accumulator 3 can be determined, for example, from a map as shown schematically in FIG. 2 as a function of the engine speed and the amount of fuel injected by the injectors 4. The value obtained in this way can therefore be processed further by the control unit 8. For this purpose, such a map only has to be stored in advance in a memory for the control unit.

Erfindungsgemäß wird somit eine Einspritzanlage mit einem einfach aufgebauten Notlaufbetrieb bereitgestellt. Der Notlaufbetrieb kann durch Ausbilden der Steuerungs- und Regeleinheit 8 aufrechterhalten werden, welche derart ausgebildet ist, dass sie das Regelventil 2 bei Auftreten einer Störung im Regelkreis zur Druckhöhenregelung im Druckspeicher 3 öff- net. Dadurch kann die Pumpe 1 trotzdem einen Volumenstrom in den Druckspeicher 3 fördern und dort sogar einen geringen Druck aufbauen, welcher einen Notbetrieb der Brennkraftmaschine ermöglicht.According to the invention, an injection system with a simply constructed emergency operation is thus provided. The limp-home operation can be maintained by designing the control and regulating unit 8, which is designed such that it opens the regulating valve 2 when a fault occurs in the regulating circuit for regulating the pressure level in the pressure accumulator 3. As a result, the pump 1 can still convey a volume flow into the pressure accumulator 3 and even build up a low pressure there, which enables emergency operation of the internal combustion engine.

In Figur 1 ist mit gestrichelten Linien auch eine weitere Variante der erfindungsgemäßen Einspritzanlage dargestellt. Wie in Figur 1 gezeigt, kann parallel zum Regelventil 2 ein Einlassrückschlagventil 12 vorgesehen sein, über welches die Kolbenpumpe Kraftstoff aus dem Niederdruckbereich 6 ansaugt. Somit muss eine Ansaugung nicht mehr durch das Regelventil 2 erfolgen. Demnach kann das Regelventil 2 auch als in Richtung des Niederdruckbereichs öffnendes Ventil ausgebildet sein. Weiterhin sei angemerkt, dass die Hochdruckpumpe nicht nur als Einkolbenpumpe ausgebildet sein kann, sondern dass auch Mehrkolbenpumpen verwendet werden können.A further variant of the injection system according to the invention is also shown in broken lines in FIG. As shown in FIG. 1, an inlet check valve 12 can be provided parallel to the control valve 2, via which the piston pump sucks in fuel from the low-pressure region 6. This means that control valve 2 no longer needs to be sucked in. Accordingly, the control valve 2 can also be designed as a valve opening in the direction of the low-pressure region. Furthermore, it should be noted that the high-pressure pump can not only be designed as a single-piston pump, but that multi-piston pumps can also be used.

Somit betrifft die vorliegende Erfindung eine Einspritzanlage für ein Brennkraftmaschine mit einer Pumpe 1, einem Druckspeicher 3, einem Sensor 7 zur Erfassung des Druckes im Druckspeicher 3, einem Regelventil 2 und einer Steuer- bzw. Regeleinheit 8. Die Steuer- bzw. Regeleinheit 8 regelt den Druck im Druckspeicher 3 durch Freigeben bzw. Verschließen einer Verbindung zu einem Niederdruckbereich 6. Die Steuerbzw. Regeleinheit weist dabei eine Notlaufsteuerung derart auf, dass bei Auftreten eines Fehlers im Regelkreis das Re- gelventil in seine Offenstellung gestellt wird.The present invention thus relates to an injection system for an internal combustion engine with a pump 1, a pressure accumulator 3, a sensor 7 for detecting the pressure in the pressure accumulator 3, a control valve 2 and a control or regulating unit 8. The control or regulating unit 8 regulates the pressure in the pressure accumulator 3 by releasing or closing a connection to a low-pressure area 6. The Steuerbzw. The control unit has an emergency operation control in such a way that the control valve is set to its open position when an error occurs in the control circuit.

Die vorliegende Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt. Es können verschiedene Abweichungen und Änderungen ausgeführt werden, ohne den Erfin- dungsumfang zu verlassen. The present invention is not limited to the exemplary embodiment shown. Various deviations and changes can be carried out without leaving the scope of the invention.

Claims

Patentansprüche claims 1. Einspritzanlage für eine Brennkraftmaschine mit einer1. Injection system for an internal combustion engine with one Pumpe (1), einem Druckspeicher (3), einem Sensor (7) zur Erfassung des Drucks im Druckspeicher (3) , einem Regelventil (2) und einer Steuer- bzw. Regeleinheit (8), wobei die Steuer- bzw. Regeleinheit (8) den Druck im Druckspeicher (3) durch Freigeben bzw. Verschließen eines Durchlasses (10) zu einem Niederdruckbereich mittels des Regelventils (2) regelt, und die Steuer- bzw. Regeleinheit (8) für einen Notlaufbetrieb bei Auftreten eines Fehlers im Regelkreis zur Regelung des Drucks im Druckspeicher das Regelventil (2) öffnet.Pump (1), a pressure accumulator (3), a sensor (7) for detecting the pressure in the pressure accumulator (3), a control valve (2) and a control or regulating unit (8), the control or regulating unit ( 8) regulates the pressure in the pressure accumulator (3) by releasing or closing a passage (10) to a low-pressure area by means of the control valve (2), and the control or regulating unit (8) for emergency operation when an error occurs in the control circuit Regulation of the pressure in the pressure accumulator opens the control valve (2). 2. Einspritzanlage nach Anspruch 1, dadurch gekennzeichnet, dass das Regelventil (2) ein elektrisch angetriebenes Volumensteuerventil ist.2. Injection system according to claim 1, characterized in that the control valve (2) is an electrically driven volume control valve. 3. Einspritzanlage nach Anspruch 2 , dadurch gekenn- zeichnet, dass. die Steuer- und Regeleinrichtung (8) bei Auftreten eines Fehlers eine Spule des elektrischen Volumensteuerventils stromlos schaltet.3. Injection system according to claim 2, characterized in that the control and regulating device (8) switches a coil of the electrical volume control valve currentless when an error occurs. 4. Einspritzanlage nach einem der vorhergehenden Ansprüche, dadurch- gekennzeichnet, dass ein Ventilschließkörper (13) des Regelventils (2) ausgehend von einem Niederdruckbereich einen Durchlass (10) in Richtung des Druckspeichers (3) öffnet.4. Injection system according to one of the preceding claims, characterized in that a valve closing body (13) of the control valve (2) opens a passage (10) in the direction of the pressure accumulator (3) starting from a low pressure region. 5. Einspritzanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei Auftreten eines Ausfalls des Sensors (7) oder eines Kurzschlusses o- der einer Leitungsunterbrechung oder eines Windungsschlusses das Regelventil (2) für den Notlaufbetrieb in seine Offenstellung gebracht wird. 5. Injection system according to one of the preceding claims, characterized in that in the event of a failure of the sensor (7) or a short circuit or an open circuit or a short circuit, the control valve (2) is brought into its open position for emergency operation. 6. Einspritzanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in Strömungsrichtung vor dem Druckspeicher (3) ein Rückschlagventil (5) angeordnet ist und eine Ansaugung von Kraftstoff durch das Regelventil (2) erfolgt.6. Injection system according to one of the preceding claims, characterized in that a check valve (5) is arranged in the flow direction upstream of the pressure accumulator (3) and fuel is sucked in through the control valve (2). 7. Einspritzanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Betätigung des Regelventils (2) mit dem Kolbenhub einer als Einkol- benpumpe ausgebildeten Pumpe (1) synchronisiert ist.7. Injection system according to one of the preceding claims, characterized in that the actuation of the control valve (2) is synchronized with the piston stroke of a pump (1) designed as a single-piston pump. 8. Einspritzanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein separates Einlassrückschlagventil (12) vorgesehen ist, welches zum Regelventil (2) parallel geschaltet ist.8. Injection system according to one of the preceding claims, characterized in that a separate inlet check valve (12) is provided, which is connected in parallel to the control valve (2). 9. Verfahren zur Aufrechterhaltung eines Notlaufbetriebes einer Brennkraftmaschine mit einer Steuer- bzw. Regeleinheit und einem Regelventil (2) zur Regelung einer Druckhöhe in einem Druckspeicher (3) , wobei bei Auftreten eines Fehlers im Regelkreis zur Regelung der Druckhöhe im Druckspeicher (3) das Regelventil (2) geöffnet wird.9.Method for maintaining emergency operation of an internal combustion engine with a control or regulating unit and a regulating valve (2) for regulating a pressure level in a pressure accumulator (3), wherein when an error occurs in the control circuit for regulating the pressure level in the pressure accumulator (3) Control valve (2) is opened. 10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass das Regelventil (2) als elektrisch angetriebenes Volumensteuerventil ausgebildet ist.10. The method according to claim 9, characterized in that the control valve (2) is designed as an electrically driven volume control valve. 11. Verfahren nach einem der Ansprüche 9 oder 10, da- durch gekennzeichnet, dass der Wert des Druckes im Druckspeicher (3) bei einem fehlenden Druckhöhensignal des Sensors (7) aus einem Kennfeld in-..Abhängigkeit von der Motordrehzahl und der eingespritzten Kraftstoffmenge bestimmt wird. 11. The method according to any one of claims 9 or 10, characterized in that the value of the pressure in the pressure accumulator (3) in the absence of a pressure signal from the sensor (7) from a map in - .. Depending on the engine speed and the amount of fuel injected is determined. 2. Verfahren nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass eine Leistungs- und Drehzahlbegrenzung auch im Notlaufbetrieb durchgeführt wird. 2. The method according to any one of claims 9 to 11, characterized in that a power and speed limitation is also carried out in emergency operation.
EP02776875A 2001-11-09 2002-11-06 Injection system comprising an emergency operation function and a corresponding emergency method Expired - Lifetime EP1442212B1 (en)

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DE10155247 2001-11-09
DE10155247A DE10155247B4 (en) 2001-11-09 2001-11-09 Injection system with emergency function
PCT/DE2002/004115 WO2003040548A1 (en) 2001-11-09 2002-11-06 Injection system comprising an emergency operation function and a corresponding emergency method

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DE50202300D1 (en) 2005-03-24
WO2003040548A1 (en) 2003-05-15
DE10155247B4 (en) 2006-08-24
US6948480B2 (en) 2005-09-27
DE10155247A1 (en) 2003-05-28
US20040200456A1 (en) 2004-10-14
EP1442212B1 (en) 2005-02-16

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