EP2271833B1 - Method for determining an over-pressure in a fuel storage means of an injection system of an internal combustion engine - Google Patents

Method for determining an over-pressure in a fuel storage means of an injection system of an internal combustion engine Download PDF

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Publication number
EP2271833B1
EP2271833B1 EP08874101A EP08874101A EP2271833B1 EP 2271833 B1 EP2271833 B1 EP 2271833B1 EP 08874101 A EP08874101 A EP 08874101A EP 08874101 A EP08874101 A EP 08874101A EP 2271833 B1 EP2271833 B1 EP 2271833B1
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EP
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Prior art keywords
pressure
overpressure
fuel
storage means
detected
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German (de)
French (fr)
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EP2271833A1 (en
Inventor
Stefan Koidl
Matthias Siedentopf
Stefan Keller
Christian Kuhnert
Detlev Straub
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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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02M63/023—Means for varying pressure in common rails

Definitions

  • the present invention relates to a method for determining an overpressure in a fuel accumulator of an injection system of an internal combustion engine, a corresponding computer program and a corresponding computer program product.
  • FIG. 1 shows an injection system 100 for an internal combustion engine as the basis of the present invention.
  • the injection system 100 comprises a fuel tank 110, from which fuel is conveyed to a metering unit (ZME) 130 by means of an electric fuel pump 120 (EKP).
  • the metering unit 130 provides in response to a control signal z of a control unit 180 a certain amount of fuel for a downstream high-pressure pump 140 ready.
  • the high pressure pump 140 pumps the fuel into a common rail 150 in which the fuel is stored under high pressure to be available on demand for injection valves (injectors) 160.
  • the fuel reservoir 150 is equipped with a pressure sensor 170 (rail pressure sensor, RDS), which is used to determine the pressure in the fuel reservoir.
  • the pressure sensor 170 transmits the measured pressure in the fuel accumulator 150 in the form of a measurement signal p to the control unit 180 of the injection system 100.
  • the measurement signal can be digital or analog.
  • Conventional (rail) pressure sensors deliver a measuring signal at the output, which is proportional to the measured (rail) pressure.
  • pressure sensors are used, the one output the maximum measurement signal that corresponds to a pressure value that is approx. 200 bar above the normal operating pressure of an injection system. It is thus not possible for the connected control unit to determine pressures above the maximum outputable pressure value. Thus, the control unit is so far not able to detect overpressures or harmful pressures quickly enough. For this reason, in known injection systems additional elements such as pressure relief valves are used to avoid harmful pressures in the fuel tank
  • the high-pressure pump or the fuel accumulator may be equipped with a pressure regulating valve (DRV), which returns an excess flow to the fuel tank.
  • DVR pressure regulating valve
  • injectors are also used which have no such overpressure functionality or in which leakage takes place only at pressures that are already harmful to the system.
  • a pressure limiting valve DBV
  • this measure has the disadvantage that the injection system must be equipped with an additional pressure relief valve.
  • the invention offers the possibility of an injection system, in particular a common rail system as it is for example in FIG. 1 is shown to operate safely and quickly and reliably detect overpressure, without having to use, for example, a pressure control valve or a pressure relief valve. It is possible to determine an undesirable overpressure in injection systems which are equipped with a pressure sensor whose maximum signal value which can be output even, in particular, does not yet correspond to any undesired overpressure. In particular, in the method according to the invention, a pressure threshold value is used whose exceeding alone does not represent any overpressure. Thus, pressure sensors can be used which comprise a limited measuring range.
  • an overpressure in the fuel accumulator is detected only when the detected pressure exceeds the predetermined pressure threshold within a predetermined first period of time after the derivative of the detected pressure after the time has exceeded the predetermined gradient threshold for the last time.
  • the predetermined first time duration can be zero or arbitrarily small.
  • an overpressure is detected when the gradient threshold value is exceeded until the pressure threshold value is exceeded.
  • a time interval can be provided as harmless for the detection of overpressure.
  • an overpressure can also be detected during short-term (corresponding to the first time duration) falling below the gradient threshold value before exceeding the pressure threshold value.
  • an overpressure in the fuel accumulator is only detected if the detected pressure exceeds the predetermined pressure threshold value longer than a predetermined second one Time exceeds.
  • a short-term corresponding to the second period of time
  • harmless exceeding the pressure threshold can be accepted without a positive pressure.
  • an overpressure in the fuel accumulator is detected only if the derivative of the detected pressure after the time exceeds the predetermined gradient threshold value for longer than a predetermined third period of time.
  • the first, second and third time periods can be selected independently of one another, so that an advantageous combination of the time durations can be provided for the respective injection system to be treated.
  • An advantageous value for the second time period is, for example, 10 ms.
  • the pressure threshold must be exceeded min. 10 ms to determine an overpressure.
  • a fuel pump which provides the fuel of a metering unit and / or a high-pressure pump, which pumps the fuel into the fuel storage, are turned off when an overpressure is detected. This can reduce the likelihood of damage to the injection system.
  • fuel is discharged from the fuel storage when an overpressure is detected. This can preferably be done non-momentarily effective on the injectors, as well as in the DE 196 36 397 A1 is described. This further reduces the likelihood of damage to the injection system.
  • an error count is provided, which is increased, preferably by one, when an overpressure is detected.
  • a metering unit is not defective at the first occurrence of overpressure.
  • an error count threshold value can be provided, at which point a defect is detected. It is also possible to provide a component replacement after a defined number of error events.
  • the invention also relates to a control device for a motor vehicle, which is adapted to carry out a method according to the invention.
  • the invention also relates to a computer program with program code means which are suitable for carrying out a method according to the invention when the computer program is executed on a computer or a corresponding arithmetic unit, in particular a control unit according to the invention.
  • the computer program product provided according to the invention comprises program code means stored on a computer-readable data carrier which are suitable for carrying out a method according to the invention when the computer program is executed on a computer or a corresponding computing unit, in particular a control unit according to the invention.
  • Suitable data carriers are, in particular, floppy disks, hard disks, flash memories, EEPROMs, CD-ROMs, DVDs and the like. It is also possible to download a program via computer networks (Internet, intranet, etc.).
  • FIG. 2 the course of a measured signal 210 of a measured rail pressure against time in a diagram 200 is shown schematically.
  • the measurement signal is plotted as voltage value U in the diagram 200 on a first y-axis 202 against the time t on an x-axis 201.
  • a pressure value p is shown, which corresponds to the output voltage value.
  • a sensor can also output a digital measurement signal representing the pressure value.
  • the measurement signal 210 of the rail pressure increases over time until it becomes saturated at a time t0. At time t0, the maximum signal value which can be output by means of the exemplary rail pressure sensor is thus reached. In the example shown, this measured signal value corresponds to a rail pressure value of approximately 2000 bar.
  • overpressure i. in particular a harmful pressure
  • a predetermined slope value is shown schematically in the diagram 200 as a straight line 210.
  • the signal course 210 (depending on the configuration, either directly or temporally delayed) to exceed the threshold value 210 to exceed a signal threshold value 220.
  • a short circuit or other defect of the sensor usually delivers a signal value that is significantly above the maximum signal value that can be output under operating conditions.
  • an output value in the case of a sensor defect could be 5 V, for example.
  • FIG. 3 In FIG. 3 are shown in a diagram 300 time-dependent pressure curves 310, 320, 330 and 340.
  • the pressure profiles are shown as pressure values p on a y-axis 302 against the time t on an x-axis 301.
  • the pressure curve 310 corresponds to a rail pressure curve in the event of a fault in which the metering unit remains in the open state in the case of an adjuster system described above. It can be seen that the rail pressure curve 310 has a value of about 3800 bar for a long time, which usually leads to damage to the injection system.
  • Another pressure curve 330 shows the associated pressure curve in the low-pressure region, ie, for example, in the region in front of the high-pressure pump 340 according to FIG FIG. 1 ,
  • the rail pressure curve 320 corresponds to a pressure curve, in which the overpressure is detected using the method according to the invention, and then advantageously the electric fuel pump 120 is switched off. It can be seen that the rail pressure profile 320 drops back to a maximum at about 3600 bar and tapers to a value of about 3000 bar. Thus, the probability of damage to the injection system can already be reduced.
  • the rail pressure profile 320 is associated with the low-pressure profile 340.
  • FIG. 4 In FIG. 4 are shown in a diagram 400 time-dependent pressure curves 410, 430 and a time-dependent injection rate curve 440.
  • the pressure profiles are plotted as pressure values p on a first y-axis 402 against the time t on an x-axis 401.
  • the injection quantity course 440 is plotted as an injection quantity m on a second y-axis 403 against the time t on the x-axis 401.
  • FIG. 4 is a Raildruckverlauf 410 shown when non-momentary effective injections (emergency injections) are activated as an additional measure. It may be appropriate, instead of a large injection quantity per injector and cycle several small Injecting quantities per injector to control a larger amount of control into the low pressure. These ensure that the rail pressure does not rise above a permissible value when the fuel pump is switched off at the same time. Shutting down the fuel pump serves to limit the amount of fuel needed to reduce the pressure.
  • the rail pressure curve 410 is the low-pressure curve 430 associated.
  • the rail pressure curve 410 initially has a value of approximately 1850 bar. At a time t1, which is about 0.81 s, an error occurs in the metering unit of the injection system, so that the metering unit remains in an open state. As a result, the rail pressure increases sharply until it exceeds a threshold value 420 at a time t0. Furthermore, the slope of the rail pressure curve between the times t1 and t0 is above a predetermined gradient threshold. This in FIG. 4 The method used is preferably designed so that an overpressure is detected if, after exceeding the predetermined gradient threshold value, the predetermined pressure threshold is exceeded for longer than a predetermined period of time. In FIG. 4 this time period corresponds to the distance t0-t2 between the times t0 and t2.
  • the rail pressure progression 410 thus continues to exceed the predetermined pressure threshold value 420 after reaching the time t2, an overpressure is detected. After detection of the overpressure consequence becomes, as already in reference to FIG. 3 described, the fuel pump switched off. To improve the pressure reduction further non-momentary effective injection is performed, which is evident from the injection quantity curve 440. It can be seen that compared to FIG. 3 under the same conditions, the rail pressure can be limited below 2400 bar.
  • an existing exhaust gas recirculation valve In order to prevent unburned fuel, in particular diesel, from being returned to the combustion chamber after it has been expelled and combusted, an existing exhaust gas recirculation valve (EGR valve) should be closed. In order to inhibit the burning of the ejected fuel, it makes sense to reduce the amount of oxygen in the exhaust gas.
  • the throttle In order to inhibit the burning of the ejected fuel, it makes sense to reduce the amount of oxygen in the exhaust gas.
  • the throttle should be closed as far as possible. It should be noted that depending on the operating point of the engine in the air system, a significant negative pressure may occur. When the throttle valve is completely closed, the air intake tract can be destroyed and thus uncontrolled air intake, which is therefore to be avoided.
  • a harmful overpressure in an injection system of an internal combustion engine can be detected quickly and, as a consequence, can also be reduced rapidly.

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  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

A method for determining an overpressure in a fuel reservoir of an injection system of an internal combustion engine, in particular in a common rail of a common rail system, the pressure in the fuel reservoir being sensed, an overpressure in the fuel reservoir being identified if the derivative of the sensed pressure over time exceeds a predetermined slope threshold value and the sensed pressure then exceeds a predetermined pressure threshold value.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Bestimmen eines Überdrucks in einem Kraftstoffspeicher eines Einspritzsystems einer Brennkraftmaschine, ein entsprechendes Computerprogramm sowie ein entsprechendes Computerprogrammprodukt.The present invention relates to a method for determining an overpressure in a fuel accumulator of an injection system of an internal combustion engine, a corresponding computer program and a corresponding computer program product.

Stand der TechnikState of the art

Bei Dieselmotoren sind heutzutage Common-Rail-Systeme (CRS) zur Kraftstoffeinspritzung weit verbreitet. Ein bekanntes Common-Rail-System wird anhand Figur 1 erläutert. Figur 1 zeigt ein Einspritzsystem 100 für eine Brennkraftmaschine wie es der vorliegenden Erfindung zugrunde liegt. Das Einspritzsystem 100 umfasst einen Kraftstofftank 110, aus dem mittels einer elektrischen Kraftstoffpumpe 120 (EKP) Kraftstoff zu einer Zumesseinheit (ZME) 130 gefördert wird. Die Zumesseinheit 130 stellt in Reaktion auf ein Regelsignal z eines Steuergerätes 180 eine bestimmte Kraftstoffmenge für eine nachgeschaltete Hochdruckpumpe 140 bereit. Die Hochdruckpumpe 140 pumpt den Kraftstoff in einen Kraftstoffspeicher (Common-Rail) 150, in dem der Kraftstoff unter hohem Druck gespeichert wird, um auf Abruf für Einspritzventile (Injektoren) 160 zur Verfügung zu stehen. Der Kraftstoffspeicher 150 ist mit einem Drucksensor 170 (Raildrucksensor, RDS) ausgestattet, der zur Bestimmung des Druckes in dem Kraftstoffspeicher dient. Der Drucksensor 170 übermittelt den gemessenen Druck in dem Kraftstoffspeicher 150 in Form eines Messsignals p an das Steuergerät 180 des Einspritzsystems 100. Das Messsignal kann digital oder analog ausgebildet sein.In diesel engines common rail systems (CRS) are widely used today for fuel injection. A well-known common rail system is based FIG. 1 explained. FIG. 1 shows an injection system 100 for an internal combustion engine as the basis of the present invention. The injection system 100 comprises a fuel tank 110, from which fuel is conveyed to a metering unit (ZME) 130 by means of an electric fuel pump 120 (EKP). The metering unit 130 provides in response to a control signal z of a control unit 180 a certain amount of fuel for a downstream high-pressure pump 140 ready. The high pressure pump 140 pumps the fuel into a common rail 150 in which the fuel is stored under high pressure to be available on demand for injection valves (injectors) 160. The fuel reservoir 150 is equipped with a pressure sensor 170 (rail pressure sensor, RDS), which is used to determine the pressure in the fuel reservoir. The pressure sensor 170 transmits the measured pressure in the fuel accumulator 150 in the form of a measurement signal p to the control unit 180 of the injection system 100. The measurement signal can be digital or analog.

Herkömmliche (Rail-)Drucksensoren liefern ein Messsignal am Ausgang, das proportional zum gemessenen (Rail-)Druck ist. Herkömmlicherweise werden Drucksensoren eingesetzt, die ein maximales Messsignal ausgeben, das einem Druckwert entspricht, der ca. 200 bar über dem üblichen Betriebsdruck eines Einspritzsystems liegt. Es ist somit für das angeschlossene Steuergerät nicht möglich, Drücke oberhalb des maximal ausgebbaren Druckwertes zu bestimmen. Somit ist das Steuergerät bisher nicht in der Lage, Überdrücke bzw. schädliche Drücke schnell genug zu erkennen. Aus diesem Grund werden bei bekannten Einspritzsystemen zusätzliche Elemente wie beispielsweise Druckbegrenzungsventile eingesetzt, um schädliche Drücke im Kraftstoffspeicher zu vermeidenConventional (rail) pressure sensors deliver a measuring signal at the output, which is proportional to the measured (rail) pressure. Conventionally, pressure sensors are used, the one output the maximum measurement signal that corresponds to a pressure value that is approx. 200 bar above the normal operating pressure of an injection system. It is thus not possible for the connected control unit to determine pressures above the maximum outputable pressure value. Thus, the control unit is so far not able to detect overpressures or harmful pressures quickly enough. For this reason, in known injection systems additional elements such as pressure relief valves are used to avoid harmful pressures in the fuel tank

Es sind verschiedene Möglichkeiten bekannt, den Druck in dem zu regeln oder auf ungefährliche Werte zu begrenzen. Beispielsweise können die Hochdruckpumpe oder der Kraftstoffspeicher mit einem Druckregelventil (DRV) ausgestattet sein, das einen Fördermengenüberschuss zum Kraftstoffbehälter zurückführt.There are various ways known to regulate the pressure in the or to limit harmless values. For example, the high-pressure pump or the fuel accumulator may be equipped with a pressure regulating valve (DRV), which returns an excess flow to the fuel tank.

Um die Kosten eines Einspritzsystems zu reduzieren, ist es auch bekannt, sogenannte Einsteller-Systeme auszubilden, bei denen der Druck im Kraftstoffspeicher nur mittels der Zumesseinheit eingestellt wird, wodurch es möglich ist, auf das kostenintensive Druckregelventil zu verzichten. Um allerdings den Raildruck im Fehlerfall zu begrenzen, wenn beispielsweise ein Defekt der Zumesseinheit vorliegt, diese beispielsweise in einem offenen Zustand verbleibt (ZME klemmt offen), ist es üblich, Injektoren einzusetzen, die im Falle der Überschreitung eines Druckschwellwerts (beispielsweise 2500 bar) öffnen und ermöglichen, dass der Druck durch Leckage abgebaut wird.In order to reduce the cost of an injection system, it is also known to form so-called adjuster systems in which the pressure in the fuel reservoir is adjusted only by means of the metering unit, whereby it is possible to dispense with the costly pressure control valve. However, in order to limit the rail pressure in case of failure, for example, if a defect of the metering unit remains, for example, in an open state (ZME jams open), it is common to use injectors that open in the event of exceeding a pressure threshold (for example, 2500 bar) and allow the pressure to be relieved by leakage.

Es werden allerdings auch Injektoren verwendet, die keine derartige Überdruckfunktionalität aufweisen oder bei denen Leckage erst bei Drücken stattfindet, die für das System bereits schädigend sind. Bei Einsatz derartiger Injektoren ist es daher üblich, den Kraftstoffspeicher mit einem Druckbegrenzungsventil (DBV) auszustatten, das bei Überschreiten eines Druckschwellwerts öffnet und den Druck im Kraftstoffspeicher abbaut. Diese Maßnahme hat jedoch den Nachteil, dass das Einspritzsystem mit einem zusätzlichen Druckbegrenzungsventil ausgestattet werden muss.However, injectors are also used which have no such overpressure functionality or in which leakage takes place only at pressures that are already harmful to the system. When using such injectors, it is therefore customary to equip the fuel accumulator with a pressure limiting valve (DBV), which opens when a pressure threshold value is exceeded and reduces the pressure in the fuel accumulator. However, this measure has the disadvantage that the injection system must be equipped with an additional pressure relief valve.

Offenbarung der ErfindungDisclosure of the invention

Erfindungsgemäß werden daher ein Verfahren zum Bestimmen eines Überdrucks in einem Kraftstoffspeicher eines Einspritzsystems einer Brennkraftmaschine, insbesondere eines Common-Rail-Systems, ein entsprechendes Computerprogramm sowie ein entsprechendes Computerprogrammprodukt mit den Merkmalen der unabhängigen Patentansprüche vorgeschlagen, die diese Nachteile nicht aufweisen. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche sowie der nachfolgenden Beschreibung.According to the invention, therefore, a method for determining an overpressure in a fuel reservoir of an injection system of an internal combustion engine, in particular a common rail system, a corresponding computer program and a corresponding computer program product with the features of the independent claims are proposed, which do not have these disadvantages. Advantageous developments are the subject of the dependent claims and the following description.

Mit der erfindungsgemäßen Lösung ist es möglich, unter Verwendung herkömmlicher Drucksensoren einen Überdruck in einem Kraftstoffspeicher zu bestimmen und in der Folge Maßnahmen zur Druckreduzierung einzuleiten, ohne zusätzliche, insbesondere kostenintensive, Bauteile vorsehen zu müssen. Die Erfindung bietet die Möglichkeit, ein Einspritzsystem, insbesondere ein Common-Rail-System wie es beispielsweise in Figur 1 dargestellt ist, sicher zu betreiben und einen Überdruck schnell und sicher zu erkennen, ohne beispielsweise ein Druckregelventil oder ein Druckbegrenzungsventil einsetzten zu müssen. Es ist möglich einen unerwünschten Überdruck bei Einspritzsystemen zu bestimmen, die mit einem Drucksensor ausgestattet sind, dessen maximal ausgebbarer Signalwert selbst insbesondere noch keinem unerwünschten Überdruck entspricht. Insbesondere wird bei dem erfindungsgemäßen Verfahren ein Druckschwellwert verwendet, dessen Überschreiten alleine noch keinen Überdruck darstellt. Somit können Drucksensoren verwendet werden, die einen beschränkten Messbereich umfassen.With the solution according to the invention, it is possible to determine an overpressure in a fuel reservoir using conventional pressure sensors and to initiate measures for pressure reduction as a result, without having to provide additional, in particular cost-intensive, components. The invention offers the possibility of an injection system, in particular a common rail system as it is for example in FIG. 1 is shown to operate safely and quickly and reliably detect overpressure, without having to use, for example, a pressure control valve or a pressure relief valve. It is possible to determine an undesirable overpressure in injection systems which are equipped with a pressure sensor whose maximum signal value which can be output even, in particular, does not yet correspond to any undesired overpressure. In particular, in the method according to the invention, a pressure threshold value is used whose exceeding alone does not represent any overpressure. Thus, pressure sensors can be used which comprise a limited measuring range.

Vorteilhafterweise wird ein Überdruck in dem Kraftstoffspeicher nur festgestellt, wenn der erfasste Druck den vorbestimmten Druckschwellwert innerhalb einer vorbestimmten ersten Zeitdauer überschreitet, nachdem die Ableitung des erfassten Drucks nach der Zeit den vorbestimmten Steigungsschwellwert letztmalig überschritten hat. Die vorbestimmte erste Zeitdauer kann Null bzw. beliebig klein sein. Somit wird bspw. ein Überdruck festgestellt, wenn der Steigungsschwellwert bis zum Überschreiten des Druckschwellwerts überschritten bleibt. Ebenso kann ein zeitlicher Abstand als unschädlich für das Erkennen eines Überdrucks vorgesehen werden. Somit kann ein Überdruck auch bei kurzzeitigem (entsprechend der ersten Zeitdauer) Unterschreiten des Steigungsschwellwertes vor dem Überschreiten des Druckschwellwertes festgestellt werden.Advantageously, an overpressure in the fuel accumulator is detected only when the detected pressure exceeds the predetermined pressure threshold within a predetermined first period of time after the derivative of the detected pressure after the time has exceeded the predetermined gradient threshold for the last time. The predetermined first time duration can be zero or arbitrarily small. Thus, for example, an overpressure is detected when the gradient threshold value is exceeded until the pressure threshold value is exceeded. Likewise, a time interval can be provided as harmless for the detection of overpressure. Thus, an overpressure can also be detected during short-term (corresponding to the first time duration) falling below the gradient threshold value before exceeding the pressure threshold value.

Zweckmäßigerweise wird ein Überdruck in dem Kraftstoffspeicher nur festgestellt, wenn der erfasste Druck den vorbestimmten Druckschwellwert länger als eine vorbestimmte zweite Zeitdauer überschreitet. Somit kann ein kurzzeitiges (entsprechend der zweiten Zeitdauer) und somit unschädliches Überschreiten des Druckschwellwertes akzeptiert werden, ohne einen Überdruck festzustellen.Conveniently, an overpressure in the fuel accumulator is only detected if the detected pressure exceeds the predetermined pressure threshold value longer than a predetermined second one Time exceeds. Thus, a short-term (corresponding to the second period of time) and thus harmless exceeding the pressure threshold can be accepted without a positive pressure.

Es ist von Vorteil, wenn ein Überdruck in dem Kraftstoffspeicher nur festgestellt wird, wenn die Ableitung des erfassten Drucks nach der Zeit den vorbestimmten Steigungsschwellwert länger als eine vorbestimmte dritte Zeitdauer überschreitet.It is advantageous if an overpressure in the fuel accumulator is detected only if the derivative of the detected pressure after the time exceeds the predetermined gradient threshold value for longer than a predetermined third period of time.

Die erste, zweite und dritte Zeitdauer können unabhängig voneinander gewählt werden, so dass eine vorteilhafte Kombination der Zeitdauern für das jeweils zu behandelnde Einspritzsystem bereitstellbar ist. Ein vorteilhafter Wert für die zweite Zeitdauer ist bspw. 10 ms. Somit muss der Druckschwellwert mind. 10 ms überschritten werden, um einen Überdruck festzustellen. Mit den beschriebenen Parametern (Zeitdauern und Schwellwerte) kann das Verfahren optimal auf unterschiedliche Einspritzsysteme abgestimmt werden.The first, second and third time periods can be selected independently of one another, so that an advantageous combination of the time durations can be provided for the respective injection system to be treated. An advantageous value for the second time period is, for example, 10 ms. Thus, the pressure threshold must be exceeded min. 10 ms to determine an overpressure. With the described parameters (time periods and threshold values), the process can be optimally adapted to different injection systems.

Es ist besonders vorteilhaft, wenn eine Kraftstoffpumpe, welche den Kraftstoff einer Zumesseinheit bereitstellt und/oder eine Hochdruckpumpe, welche den Kraftstoff in den Kraftstoffspeicher pumpt, abgeschaltet werden, wenn ein Überdruck festgestellt wird. Damit kann die Wahrscheinlichkeit einer Beschädigung des Einspritzsystems vermindert werden.It is particularly advantageous if a fuel pump, which provides the fuel of a metering unit and / or a high-pressure pump, which pumps the fuel into the fuel storage, are turned off when an overpressure is detected. This can reduce the likelihood of damage to the injection system.

Gemäß einer besonders bevorzugten Ausgestaltung der Erfindung wird Kraftstoff aus dem Kraftstoffspeicher abgegeben, wenn ein Überdruck festgestellt wird. Dies kann vorzugsweise nicht-momentenwirksam über die Injektoren erfolgen, wie es auch in der DE 196 36 397 A1 beschrieben ist. Damit lässt sich die Wahrscheinlichkeit einer Beschädigung des Einspritzsystems weiter vermindern.According to a particularly preferred embodiment of the invention, fuel is discharged from the fuel storage when an overpressure is detected. This can preferably be done non-momentarily effective on the injectors, as well as in the DE 196 36 397 A1 is described. This further reduces the likelihood of damage to the injection system.

Zweckmäßigerweise wird ein Fehlerzählwert vorgesehen, der, vorzugsweise um eins, erhöht wird, wenn ein Überdruck festgestellt wird. Beispielsweise ist eine Zumesseinheit nicht beim ersten Auftreten eines Überdrucks defekt. Es kann bspw. ein Fehlerzählschwellwert vorgesehen werden, bei dessen Überschreiten ein Defekt festgestellt wird. Es besteht weiterhin die Möglichkeit, einen Komponentenaustausch nach einer definierten Anzahl von Fehlerereignissen vorzusehen.Conveniently, an error count is provided, which is increased, preferably by one, when an overpressure is detected. For example, a metering unit is not defective at the first occurrence of overpressure. For example, an error count threshold value can be provided, at which point a defect is detected. It is also possible to provide a component replacement after a defined number of error events.

Die Erfindung betrifft zudem ein Steuergerät für ein Kraftfahrzeug, das dazu eingerichtet ist, ein erfindungsgemäßes Verfahren auszuführen.The invention also relates to a control device for a motor vehicle, which is adapted to carry out a method according to the invention.

Die Erfindung betrifft zudem ein Computerprogramm mit Programmcodemitteln, die geeignet sind, ein erfindungsgemäßes Verfahren auszuführen, wenn das Computerprogramm auf einem Computer oder einer entsprechenden Recheneinheit, insbesondere einem erfindungsgemäßen Steuergerät, ausgeführt wird.The invention also relates to a computer program with program code means which are suitable for carrying out a method according to the invention when the computer program is executed on a computer or a corresponding arithmetic unit, in particular a control unit according to the invention.

Das erfindungsgemäß vorgesehene Computerprogrammprodukt umfasst auf einem computerlesbaren Datenträger gespeicherte Programmcodemittel, die geeignet sind, ein erfindungsgemäßes Verfahren auszuführen, wenn das Computerprogramm auf einem Computer oder einer entsprechenden Recheneinheit, insbesondere einem erfindungsgemäßen Steuergerät, ausgeführt wird. Geeignete Datenträger sind insbesondere Disketten, Festplatten, Flash-Speicher, EEPROMs, CD-ROMs, DVDs u.a.m. Auch ein Download eines Programms über Computernetze (Internet, Intranet usw.) ist möglich.The computer program product provided according to the invention comprises program code means stored on a computer-readable data carrier which are suitable for carrying out a method according to the invention when the computer program is executed on a computer or a corresponding computing unit, in particular a control unit according to the invention. Suitable data carriers are, in particular, floppy disks, hard disks, flash memories, EEPROMs, CD-ROMs, DVDs and the like. It is also possible to download a program via computer networks (Internet, intranet, etc.).

Weitere Vorteile und Ausgestaltungen der Erfindung ergeben sich aus der Beschreibung und der beiliegenden Zeichnung.Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Kurze Beschreibung der Zeichnungen

Figur 1
zeigt in schematischer Darstellung ein Einspritzsystem für eine Brennkraftmaschine.
Figur 2
zeigt schematisch eine Abhängigkeit eines gemessenen Raildrucks von der Zeit.
Figur 3
zeigt schematisch eine Abhängigkeit eines Raildrucks sowie eines Niederdrucks von der Zeit.
Figur 4
zeigt schematisch eine Abhängigkeit eines Raildrucks, eines Niederdrucks sowie einer Einspritzmenge von der Zeit.
Brief description of the drawings
FIG. 1
shows a schematic representation of an injection system for an internal combustion engine.
FIG. 2
schematically shows a dependence of a measured rail pressure on time.
FIG. 3
schematically shows a dependence of a rail pressure and a low pressure of time.
FIG. 4
schematically shows a dependence of a rail pressure, a low pressure and an injection amount of the time.

Ausführungsformen der ErfindungEmbodiments of the invention

Die Erfindung ist anhand eines Ausführungsbeispiels in der Zeichnung schematisch dargestellt und wird im folgenden unter Bezugnahme auf die Zeichnung ausführlich beschrieben.The invention is illustrated schematically with reference to an embodiment in the drawing and will be described below in detail with reference to the drawings.

In Figur 2 ist der Verlauf eines Messsignals 210 eines gemessenen Raildrucks gegen die Zeit in einem Diagramm 200 schematisch dargestellt. Das Messsignal ist als Spannungswert U in dem Diagramm 200 auf einer ersten y-Achse 202 gegen die Zeit t auf einer x-Achse 201 aufgetragen. Auf einer zweiten y-Achse 203 ist ein Druckwert p dargestellt, der dem ausgegebenen Spannungswert entspricht. Es versteht sich, dass ein Sensor ebenso ein digitales Messsignal ausgeben kann, das den Druckwert darstellt. Das Messsignal 210 des Raildrucks steigt über die Zeit an, bis es bei einem Zeitpunkt t0 in eine Sättigung übergeht. Zum Zeitpunkt t0 ist somit der mit dem beispielhaft gewählten Raildrucksensor maximal ausgebbare Messsignalwert erreicht. Dieser Messsignalwert entspricht im gezeigten Beispiel einem Raildruckwert von ca. 2000 bar.In FIG. 2 the course of a measured signal 210 of a measured rail pressure against time in a diagram 200 is shown schematically. The measurement signal is plotted as voltage value U in the diagram 200 on a first y-axis 202 against the time t on an x-axis 201. On a second y-axis 203, a pressure value p is shown, which corresponds to the output voltage value. It is understood that a sensor can also output a digital measurement signal representing the pressure value. The measurement signal 210 of the rail pressure increases over time until it becomes saturated at a time t0. At time t0, the maximum signal value which can be output by means of the exemplary rail pressure sensor is thus reached. In the example shown, this measured signal value corresponds to a rail pressure value of approximately 2000 bar.

Allerdings ist bei Erreichen dieses Raildrucks noch kein für das System schädlicher Druck erreicht. Die in der Beschreibungseinleitung genannten Druckbegrenzungsventile sind beispielsweise auf Drücke von ca. 2500 bar ausgelegt. Durch das erfindungsgemäße Verfahren ist es nun möglich, schädliche und unschädliche Drücke zu unterscheiden, wie es nachfolgend beschrieben wird.However, when this rail pressure is reached, no harmful pressure on the system has yet been reached. The pressure relief valves mentioned in the introduction are designed, for example, to pressures of about 2500 bar. The inventive method, it is now possible to distinguish harmful and harmless pressures, as described below.

Bei der dargestellten Ausführungsform wird ein Überdruck, d.h. insbesondere ein schädlicher Druck, festgestellt, wenn der zeitabhängige Signalverlauf 210 zunächst einen vorbestimmten Steigungswert überschreitet. Dieser vorbestimmte Steigungswert ist in dem Diagramm 200 schematisch als Gerade 210 dargestellt. Weiterhin ist es notwendig, dass der Signalverlauf 210 im Anschluss (je nach Ausgestaltung unmittelbar oder zeitlich verzögert) an das Übersteigen des Steigungswertes 210 einen Signalschwellwert 220 überschreitet.In the illustrated embodiment, overpressure, i. in particular a harmful pressure, determined when the time-dependent waveform 210 initially exceeds a predetermined slope value. This predetermined slope value is shown schematically in the diagram 200 as a straight line 210. Furthermore, it is necessary for the signal course 210 (depending on the configuration, either directly or temporally delayed) to exceed the threshold value 210 to exceed a signal threshold value 220.

Ein Kurzschluss oder anderer Defekt des Sensors liefert üblicherweise einen Signalwert, der deutlich über dem unter Betriebsbedingungen maximal ausgebbaren Signalwert liegt. In der dargestellten Abbildung könnte ein Ausgabewert im Falle eines Sensordefektes beispielsweise bei 5 V liegen.A short circuit or other defect of the sensor usually delivers a signal value that is significantly above the maximum signal value that can be output under operating conditions. In the For example, an output value in the case of a sensor defect could be 5 V, for example.

In Figur 3 sind in einem Diagramm 300 zeitabhängige Druckverläufe 310, 320, 330 und 340 abgebildet. Die Druckverläufe sind als Druckwerte p auf einer y-Achse 302 gegen die Zeit t auf einer x-Achse 301 dargestellt. Der Druckverlauf 310 entspricht einem Raildruckverlauf in einem Fehlerfall, in dem bei einem oben beschriebenen Einsteller-System die Zumesseinheit in offenem Zustand verbleibt. Es ist erkennbar, dass der Raildruckverlauf 310 längere Zeit einen Wert von ca. 3800 bar besitzt, was üblicherweise zu einer Beschädigung des Einspritzsystems führt. Ein weiterer Druckverlauf 330 zeigt den zugehörigen Druckverlauf im Niederdruckbereich, d.h. bspw. im Bereich vor der Hochdruckpumpe 340 gemäß Figur 1.In FIG. 3 are shown in a diagram 300 time-dependent pressure curves 310, 320, 330 and 340. The pressure profiles are shown as pressure values p on a y-axis 302 against the time t on an x-axis 301. The pressure curve 310 corresponds to a rail pressure curve in the event of a fault in which the metering unit remains in the open state in the case of an adjuster system described above. It can be seen that the rail pressure curve 310 has a value of about 3800 bar for a long time, which usually leads to damage to the injection system. Another pressure curve 330 shows the associated pressure curve in the low-pressure region, ie, for example, in the region in front of the high-pressure pump 340 according to FIG FIG. 1 ,

Demgegenüber entspricht der Raildruckverlauf 320 einem Druckverlauf, bei dem unter Anwendung des erfindungsgemäßen Verfahrens der Überdruck erkannt wird und danach vorteilhafterweise die elektrische Kraftstoffpumpe 120 abgeschaltet wird. Man erkennt, dass der Raildruckverlauf 320 nach einem Maximum bei ca. 3600 bar wieder abfällt und auf einen Wert von ca. 3000 bar zuläuft. Damit kann die Wahrscheinlichkeit einer Schädigung des Einspritzsystems bereits verringert werden. Dem Raildruckverlauf 320 ist der Niederdruckverlauf 340 zugehörig.In contrast, the rail pressure curve 320 corresponds to a pressure curve, in which the overpressure is detected using the method according to the invention, and then advantageously the electric fuel pump 120 is switched off. It can be seen that the rail pressure profile 320 drops back to a maximum at about 3600 bar and tapers to a value of about 3000 bar. Thus, the probability of damage to the injection system can already be reduced. The rail pressure profile 320 is associated with the low-pressure profile 340.

Zur Verbesserung des Druckabbaus ist es möglich, den Druck im Kraftstoffspeicher bei Feststellen eines Überdrucks durch Verwendung des erfindungsgemäß Verfahrens über die Injektoren 160 zusätzlich abzubauen. Ein entsprechender Druckverlauf ist in Figur 4 abgebildet.To improve the pressure reduction, it is possible to additionally reduce the pressure in the fuel reservoir when detecting an overpressure by using the method according to the invention via the injectors 160. A corresponding pressure curve is in FIG. 4 displayed.

In Figur 4 sind in einem Diagramm 400 zeitabhängige Druckverläufe 410, 430 sowie ein zeitabhängiger Einspritzmengenverlauf 440 dargestellt. Die Druckverläufe sind als Druckwerte p auf einer ersten y-Achse 402 gegen die Zeit t auf einer x-Achse 401 aufgetragen. Der Einspritzmengenverlauf 440 ist als Einspritzmenge m auf einer zweiten y-Achse 403 gegen die Zeit t auf der x-Achse 401 aufgetragen.In FIG. 4 are shown in a diagram 400 time-dependent pressure curves 410, 430 and a time-dependent injection rate curve 440. The pressure profiles are plotted as pressure values p on a first y-axis 402 against the time t on an x-axis 401. The injection quantity course 440 is plotted as an injection quantity m on a second y-axis 403 against the time t on the x-axis 401.

In Figur 4 ist ein Raildruckverlauf 410 dargestellt, wenn als zusätzliche Maßnahme nicht-momentenwirksame Einspritzungen (Noteinspritzungen) aktiviert werden. Hierbei kann es zweckmäßig sein, anstelle einer großen Einspritzmenge pro Injektor und Zyklus mehrere kleine Mengen pro Injektor einzuspritzen, um eine größere Steuermenge in den Niederdruck abzusteuern. Diese sorgen mit gleichzeitigem Abschalten der Kraftstoffpumpe dafür, dass der Raildruck nicht über einen zulässigen Wert ansteigt. Das Abschalten der Kraftstoffpumpe dient dazu, die zum Druckabbau notwendige einzuspritzende Menge zu begrenzen. Dem Raildruckverlauf 410 ist der Niederdruckverlauf 430 zugehörig.In FIG. 4 is a Raildruckverlauf 410 shown when non-momentary effective injections (emergency injections) are activated as an additional measure. It may be appropriate, instead of a large injection quantity per injector and cycle several small Injecting quantities per injector to control a larger amount of control into the low pressure. These ensure that the rail pressure does not rise above a permissible value when the fuel pump is switched off at the same time. Shutting down the fuel pump serves to limit the amount of fuel needed to reduce the pressure. The rail pressure curve 410 is the low-pressure curve 430 associated.

Der Raildruckverlauf 410 weist anfänglich einen Wert von ca. 1850 bar auf. Zu einem Zeitpunkt t1, der bei ca. 0,81 s liegt, tritt ein Fehler in der Zumesseinheit des Einspritzsystems auf, so dass die Zumesseinheit in einem offenen Zustand verbleibt. In der Folge steigt der Raildruck stark an, bis er zu einem Zeitpunkt t0 einen Schwellwert 420 überschreitet. Weiterhin liegt die Steigung des Raildruckverlaufs zwischen den Zeitpunkten t1 und t0 über einem vorbestimmten Steigungsschwellwert. Das in Figur 4 verwendete Verfahren ist bevorzugterweise so ausgestaltet, dass ein Überdruck erkannt wird, wenn nach Überschreiten des vorbestimmten Steigungsschwellwertes der vorbestimmte Druckschwellwert länger als eine vorbestimmte Zeitdauer überschritten wird. In Figur 4 entspricht diese Zeitdauer dem Abstand t0-t2 zwischen den Zeitpunkten t0 und t2. Da der Raildruckverlauf 410 somit nach Erreichen des Zeitpunktes t2 weiterhin den vorbestimmten Druckschwellwert 420 überschritten hat, wird ein Überdruck festgestellt. Nach Feststellung des Überdrucks Folge wird, wie bereits in Bezugnahme auf Figur 3 beschrieben, die Kraftstoffpumpe abgeschaltet. Zur Verbesserung des Druckabbaus wird weiterhin eine nicht-momentenwirksame Einspritzung durchgeführt, was anhand des Einspritzmengenverlaufs 440 ersichtlich ist. Es ist erkennbar, dass im Vergleich zu Figur 3 bei gleichen Randbedingungen der Raildruck unterhalb von 2400 bar begrenzt werden kann.The rail pressure curve 410 initially has a value of approximately 1850 bar. At a time t1, which is about 0.81 s, an error occurs in the metering unit of the injection system, so that the metering unit remains in an open state. As a result, the rail pressure increases sharply until it exceeds a threshold value 420 at a time t0. Furthermore, the slope of the rail pressure curve between the times t1 and t0 is above a predetermined gradient threshold. This in FIG. 4 The method used is preferably designed so that an overpressure is detected if, after exceeding the predetermined gradient threshold value, the predetermined pressure threshold is exceeded for longer than a predetermined period of time. In FIG. 4 this time period corresponds to the distance t0-t2 between the times t0 and t2. Since the rail pressure progression 410 thus continues to exceed the predetermined pressure threshold value 420 after reaching the time t2, an overpressure is detected. After detection of the overpressure consequence becomes, as already in reference to FIG. 3 described, the fuel pump switched off. To improve the pressure reduction further non-momentary effective injection is performed, which is evident from the injection quantity curve 440. It can be seen that compared to FIG. 3 under the same conditions, the rail pressure can be limited below 2400 bar.

Um zu verhindern, dass nicht verbrannter Kraftstoff, insbesondere Diesel, nach dem Ausstoßen aus dem Brennraum diesem wieder zugeführt wird und verbrennt, sollte ein vorhandenes Abgasrückführventil (AGR-Ventil) geschlossen werden. Um das Verbrennen des ausgestoßenen Kraftstoffes zu hemmen, ist es sinnvoll die Sauerstoffmenge im Abgas zu reduzieren. Hierfür sollte die Drosselklappe möglichst weit geschlossen werden. Dabei ist zu beachten, dass je nach Betriebspunkt des Motors im Luftsystem ein nennenswerter Unterdruck entstehen kann. Bei völlig geschlossener Drosselklappe kann es zur Zerstörung des Luftansaugtraktes und damit zur unkontrollierten Luftansaugung kommen, was daher zu vermeiden ist.In order to prevent unburned fuel, in particular diesel, from being returned to the combustion chamber after it has been expelled and combusted, an existing exhaust gas recirculation valve (EGR valve) should be closed. In order to inhibit the burning of the ejected fuel, it makes sense to reduce the amount of oxygen in the exhaust gas. For this purpose, the throttle should be closed as far as possible. It should be noted that depending on the operating point of the engine in the air system, a significant negative pressure may occur. When the throttle valve is completely closed, the air intake tract can be destroyed and thus uncontrolled air intake, which is therefore to be avoided.

Durch das erfindungsgemäß Verfahren kann ein schädlicher Überdruck in einem Einspritzsystem einer Brennkraftmaschine schnell erkannt und in der Folge auch bevorzugterweise schnell abgebaut werden.By the method according to the invention, a harmful overpressure in an injection system of an internal combustion engine can be detected quickly and, as a consequence, can also be reduced rapidly.

Es versteht sich, dass in den dargestellten Figuren nur eine besonders bevorzugte Ausführungsform der Erfindung dargestellt ist. Daneben ist jede andere Ausführungsform denkbar.It is understood that in the illustrated figures, only a particularly preferred embodiment of the invention is shown. In addition, any other embodiment is conceivable.

Claims (10)

  1. Method for determining an overpressure in a fuel storage means (150) of an injection system (100) of an internal combustion engine, in particular in a common rail of a common rail system,
    wherein the pressure in the fuel storage means (150) is sensed,
    wherein an overpressure in the fuel storage means (150) is detected if the derivative of the sensed pressure (210; 410) over time (t) exceeds a predetermined gradient threshold value (215), and the sensed pressure (210; 410) subsequently exceeds a predetermined pressure threshold value (220; 420).
  2. Method according to Claim 1, wherein an overpressure in the fuel storage means (150) is detected only if the sensed pressure (210; 410) exceeds the predetermined pressure threshold value (220; 420) within a predetermined first time period after the derivative of the sensed pressure (210; 410) over time (t) has exceeded the predetermined gradient threshold value (215) for the last time.
  3. Method according to Claim 1 or 2, wherein an overpressure in the fuel storage means (150) is detected only if the sensed pressure (210; 410) exceeds the predetermined pressure threshold value (220; 420) for longer than a predetermined second time period (t2-t0).
  4. Method according to one of the preceding claims, wherein an overpressure in the fuel storage means (150) is detected only if the derivative of the sensed pressure (210; 410) over time (t) exceeds the predetermined gradient threshold value (215) for longer than a predetermined third time period.
  5. Method according to one of the preceding claims, wherein a fuel pump (120) which makes the fuel available to a metering unit (130) and/or a high pressure pump (140) which pumps the fuel into the fuel storage means (150) are switched off if an overpressure is detected.
  6. Method according to one of the preceding claims, wherein fuel is discharged from the fuel storage means (150) if an overpressure is detected.
  7. Method according to one of the preceding claims, wherein a fault counting value is provided which is incremented if an overpressure is detected.
  8. Control unit (180) for a motor vehicle which is configured to carry out a method according to one of Claims 1 to 7.
  9. Computer program with program code means which carry out a method according to one of Claims 1 to 7, when the computer program is run on a computer or a corresponding computer unit, in particular a control unit according to Claim 8.
  10. Computer program product comprising program code means which are stored on a computer-readable data carrier and which carry out a method according to one of Claims 1 to 7 when the computer program is run on a computer or a corresponding computer unit, in particular a control unit according to Claim 8.
EP08874101A 2008-04-29 2008-12-18 Method for determining an over-pressure in a fuel storage means of an injection system of an internal combustion engine Active EP2271833B1 (en)

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DE102008001444A DE102008001444A1 (en) 2008-04-29 2008-04-29 Method for determining an overpressure in a fuel accumulator of an injection system of an internal combustion engine
PCT/EP2008/067912 WO2009132721A1 (en) 2008-04-29 2008-12-18 Method for determining an over-pressure in a fuel storage means of an injection system of an internal combustion engine

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WO2009132721A1 (en) 2009-11-05
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