EP1826385A1 - Method for operating an injection system for a combustion engine - Google Patents

Method for operating an injection system for a combustion engine Download PDF

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Publication number
EP1826385A1
EP1826385A1 EP07100580A EP07100580A EP1826385A1 EP 1826385 A1 EP1826385 A1 EP 1826385A1 EP 07100580 A EP07100580 A EP 07100580A EP 07100580 A EP07100580 A EP 07100580A EP 1826385 A1 EP1826385 A1 EP 1826385A1
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EP
European Patent Office
Prior art keywords
combustion engine
internal combustion
accelerator pedal
speed
pressure
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Granted
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EP07100580A
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German (de)
French (fr)
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EP1826385B1 (en
Inventor
Thomas Dingler
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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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • 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
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • 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 invention relates to a method for operating an injection system of an internal combustion engine according to the preamble of claim 1.
  • a method and a device with a fuel metering system in which the fuel is conveyed by means of a pump in a memory, for example, from EP 0 976 921 B1 known. From the memory, the fuel passes through controllable injectors into the combustion chambers of the internal combustion engine. A sensor provides a pressure signal that characterizes the pressure in the memory. The pressure in the reservoir is taken into account when controlling the injectors. Accurate metering of fuel is only possible if accurate values of pressure in the reservoir are known. In common rail systems, the pressure is in the range between a few 100 bar to about 2000 bar. Within this range, the pressure sensor must reliably provide a signal. A failure of the pressure sensor or a faulty signal of the pressure sensor lead to an inaccurate fuel metering. In internal combustion engines in which a pressure control with a pressure control valve is not possible, the internal combustion engine is switched off in this case.
  • the object of the invention is to develop a generic method for operating an injection system of an internal combustion engine to the effect that even in systems where a pressure control with a pressure control valve is not possible, in the event of failure of the pressure sensor emergency operation of the vehicle is possible, so as to achieve a safe parking or a service operation.
  • the basic idea of the invention is to provide a replacement control loop which, in the event of a failure of the pressure sensor, permits limited emergency operation of the vehicle.
  • This is achieved according to the invention in that, in the event of a failure of the pressure sensor, the control duration of the injectors and the setpoint speed are kept constant as a function of the operating point. In this way, the amount injected by injectors depends solely on the pressure in the pressure accumulator, the so-called rail. If the speed increases, the pressure is too high. If the speed drops, the pressure is too low.
  • the control deviation of the speed is now used as input for the pressure regulator and the speed of the internal combustion engine is controlled by a manipulated variable of the metering unit to a constant value. Due to this closed control loop, an excessive rail pressure leads to an increased speed and thus in the rail pressure regulator to close the metering unit. This results in a reduced pump delivery. This in turn results in a reduced rail pressure, resulting in a reduced injection quantity and thus in turn a lower speed. By contrast, too small a rail pressure leads to a decrease in the speed and thus to the opening of the metering unit. This leads to an increased pump delivery, resulting in an increased rail pressure, which in turn results in an increased injection quantity and this in turn leads to a higher speed. By means of these measures, the rail pressure can be maintained in a range permissible for the system and an emergency running program can be realized with the constant speed.
  • Another advantageous embodiment of the method in which an increased quantity requirement is detected, for example, during start-up, provides that the activation duration is switched to a greater value as a function of signals indicating the position of a clutch and / or a transmission and / or the speed of the vehicle and / or the position of the accelerator pedal.
  • the activation duration is preferably changed in stages, specifically as a function of the accelerator pedal position. There are preferably three stages provided, i. it only reacts to big changes of the gas pedal. In a first stage, the activation duration is extended if an accelerator operation characterizing an acceleration process of the vehicle is present. In a second stage, the driving time is not changed when there is an accelerator pedal position characterizing a constant speed of the vehicle. And in a third position, the drive duration is reduced at a throttle speed characterizing accelerator pedal position.
  • a rapid adaptation of the metering unit may be provided, for example, upon detection of critical operating points, e.g. the clutch pedal is pressed. In this case, an increased fuel delivery amount from the metering unit - e.g. to start - to be set.
  • FIG. 1 a block diagram of an injection system of an internal combustion engine for explaining the method according to the invention is shown schematically.
  • an embodiment of an injection system of an internal combustion engine 310 is shown schematically.
  • the internal combustion engine 310 has controllable injectors 321, 322, 323, 324, by means of which fuel is injected into the combustion chambers 331, 332, 333, 334 of the internal combustion engine 310.
  • the fuel is injected under high pressure into the combustion chambers 331, 332, 333, 334.
  • a memory 300 is provided, a so-called rail, in which the fuel is stored under high pressure. All injectors 321, 322, 323, 324 are powered by this memory 300.
  • the pressure in the reservoir 300 is generated by a feed pump 210 whose feed is controlled by a metering unit 200.
  • a pressure sensor 305 is arranged, the output signal of which is supplied to a rail pressure regulator 110, which is part of a control unit 400.
  • the rail pressure controller 110 determines a manipulated variable 120 of the metering unit 200, which is determined as a function of a rail pressure control deviation.
  • the rail pressure regulator 110 is supplied with a selection of input variables, for example a signal characterizing the gas pedal travel, a signal characterizing the clutch position, a signal characterizing the engaged gear of a transmission, as in FIG the figure schematically indicated by a block 130.
  • the drive duration of the injectors 321, 322, 323, 324 is also calculated.
  • the rotational speed of the internal combustion engine is regulated by a manipulated variable of the metering unit 200 to a constant value in the manner described below.
  • a target speed 150 is specified depending on the accelerator pedal position.
  • the desired speed 150 is subtracted from the currently prevailing speed 140 in a computing element 160 that is part of the controller 400. In the rail pressure controller 110, this difference (control deviation) is now regulated to the value 0, so that the current speed 140 corresponds to the setpoint speed 150.
  • one or more constant values are stored in the control unit, which values are predefined as a function of the operating state.
  • the current speed 140 is therefore kept constant only by a change in the pressure in the rail 300, which is changed by the position of the metering unit 200.
  • a longer actuation duration is predetermined.
  • an operating state which can be concluded with an unchanged accelerator pedal position on an unchanged speed of the vehicle.
  • the driving time is maintained.
  • an operating state of the motor vehicle which is indicative of a reduction in the speed, that is, when the accelerator pedal is operated so that the accelerator pedal travel is reduced - ie "gas taken away" -, the driving time is reduced by the metering unit 200.
  • a change in the activation duration can also be carried out as a function of the clutch pedal travel or of the transmission information as well as directly on the driving speed. For example, when the vehicle speed is increased or the transmission ratio is changed to a longer driving time, e.g. be switched by means of a ramp.

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

Abstract

The method involves injecting fuel into combustion chambers (331-334) of an internal combustion engine (310) by controllable injectors (321-324). A pressure sensor (305) provides a pressure signal which characterizes pressure in an accumulator (300). Control duration of the injectors is kept constant in case of malfunction of the pressure sensor, and a rotational speed of the internal combustion engine is regulated to a constant value by a control variable of a dosing unit (200).

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren zum Betreiben eines Einspritzsystems einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for operating an injection system of an internal combustion engine according to the preamble of claim 1.

Ein Verfahren und eine Vorrichtung mit einem Kraftstoffzumesssystem, bei dem der Kraftstoff mittels einer Pumpe in einen Speicher gefördert wird, ist beispielsweise aus der EP 0 976 921 B1 bekannt geworden. Vom Speicher gelangt der Kraftstoff über steuerbare Injektoren in die Brennräume der Brennkraftmaschine. Ein Sensor stellt ein Drucksignal bereit, das den Druck im Speicher charakterisiert. Der Druck im Speicher wird bei der Steuerung der Injektoren berücksichtigt. Eine genaue Kraftstoffzumessung ist nur möglich, wenn genaue Werte des Druckes im Speicher bekannt sind. Bei Common-Rail-Systemen liegt der Druck im Bereich zwischen einigen 100 bar bis ca. 2000 bar. Innerhalb dieses Bereichs muss der Drucksensor zuverlässig ein Signal bereitstellen. Ein Ausfall des Drucksensors bzw. ein fehlerhaftes Signal des Drucksensors führen zu einer ungenauen Kraftstoffzumessung. Bei Brennkraftmaschinen, bei denen eine Drucksteuerung mit einem Druckregelventil nicht möglich ist, wird in diesem Falle die Brennkraftmaschine abgeschaltet.A method and a device with a fuel metering system in which the fuel is conveyed by means of a pump in a memory, for example, from EP 0 976 921 B1 known. From the memory, the fuel passes through controllable injectors into the combustion chambers of the internal combustion engine. A sensor provides a pressure signal that characterizes the pressure in the memory. The pressure in the reservoir is taken into account when controlling the injectors. Accurate metering of fuel is only possible if accurate values of pressure in the reservoir are known. In common rail systems, the pressure is in the range between a few 100 bar to about 2000 bar. Within this range, the pressure sensor must reliably provide a signal. A failure of the pressure sensor or a faulty signal of the pressure sensor lead to an inaccurate fuel metering. In internal combustion engines in which a pressure control with a pressure control valve is not possible, the internal combustion engine is switched off in this case.

Aufgabe der Erfindung ist es, ein gattungsgemäßes Verfahren zum Betreiben eines Einspritzsystems einer Brennkraftmaschine dahingehend weiterzubilden, dass auch bei Systemen, bei denen eine Drucksteuerung mit einem Druckregelventil nicht möglich ist, im Falle eines Ausfalls des Drucksensors ein Notbetrieb des Fahrzeugs möglich ist, um so noch einen sicheren Parkplatz oder einen Servicebetrieb zu erreichen.The object of the invention is to develop a generic method for operating an injection system of an internal combustion engine to the effect that even in systems where a pressure control with a pressure control valve is not possible, in the event of failure of the pressure sensor emergency operation of the vehicle is possible, so as to achieve a safe parking or a service operation.

Darstellung und Vorteile der ErfindungPresentation and advantages of the invention

Diese Aufgabe wird bei einem Verfahren zum Betreiben eines Einspritzsystems einer Brennkraftmaschine der eingangs genannten Art mit den Merkmalen des Anspruchs 1 gelöst. Grundidee der Erfindung ist es, einen Ersatzregelkreis zur Verfügung zu stellen, welcher bei einem Ausfall des Drucksensors einen eingeschränkten Notbetrieb des Fahrzeugs ermöglicht. Dies wird erfindungsgemäß dadurch erreicht, dass bei einem Ausfall des Drucksensors die Ansteuerdauer der Injektoren und die Solldrehzahl betriebspunktabhängig konstant gehalten werden. Auf diese Weise hängt die durch Injektoren eingespritzte Menge alleine vom Druck in dem Druckspeicher, dem sogenannten Rail, ab. Steigt demnach die Drehzahl an, so ist der Druck zu groß. Fällt die Drehzahl ab, so ist der Druck zu klein. Die Regelabweichung der Drehzahl wird nun als Eingang für den Druckregler verwendet und die Drehzahl der Brennkraftmaschine durch eine Stellgröße der Zumesseinheit auf einen konstanten Wert geregelt. Aufgrund dieses geschlossenen Regelkreises führt ein zu großer Raildruck zu einer erhöhten Drehzahl und somit im Raildruckregler zum Schließen der Zumesseinheit. Hieraus resultiert eine reduzierte Pumpenförderung. Hieraus wiederum ein reduzierter Raildruck, daraus eine reduzierte Einspritzmenge und so wiederum im Ergebnis eine kleinere Drehzahl. Ein zu kleiner Raildruck führt dagegen zu einem Abfall der Drehzahl und damit zum Öffnen der Zumesseinheit. Dies führt zu einer erhöhten Pumpenförderung, hieraus resultiert ein erhöhter Raildruck, daraus wiederum eine erhöhte Einspritzmenge und dies führt wiederum zu einer größeren Drehzahl. Durch diese Maßnahmen kann der Raildruck in einem für das System zulässigen Bereich gehalten werden und mit der konstanten Drehzahl ein Notfahrprogramm realisiert werden.This object is achieved in a method for operating an injection system of an internal combustion engine of the aforementioned type with the features of claim 1. The basic idea of the invention is to provide a replacement control loop which, in the event of a failure of the pressure sensor, permits limited emergency operation of the vehicle. This is achieved according to the invention in that, in the event of a failure of the pressure sensor, the control duration of the injectors and the setpoint speed are kept constant as a function of the operating point. In this way, the amount injected by injectors depends solely on the pressure in the pressure accumulator, the so-called rail. If the speed increases, the pressure is too high. If the speed drops, the pressure is too low. The control deviation of the speed is now used as input for the pressure regulator and the speed of the internal combustion engine is controlled by a manipulated variable of the metering unit to a constant value. Due to this closed control loop, an excessive rail pressure leads to an increased speed and thus in the rail pressure regulator to close the metering unit. This results in a reduced pump delivery. This in turn results in a reduced rail pressure, resulting in a reduced injection quantity and thus in turn a lower speed. By contrast, too small a rail pressure leads to a decrease in the speed and thus to the opening of the metering unit. This leads to an increased pump delivery, resulting in an increased rail pressure, which in turn results in an increased injection quantity and this in turn leads to a higher speed. By means of these measures, the rail pressure can be maintained in a range permissible for the system and an emergency running program can be realized with the constant speed.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind Gegenstand der auf Anspruch 1 rückbezogenen Unteransprüche. So sieht eine vorteilhafte Ausgestaltung vor, die Ansteuerdauer der Injektoren abhängig vom Betriebszustand der Brennkraftmaschine und/oder des Fahrzeugs, welches die Brennkraftmaschine antreibt, zu verändern.Further advantageous embodiments of the method according to the invention are the subject of the dependent claims on claim 1. That's what one sees advantageous embodiment, the driving duration of the injectors depending on the operating condition of the internal combustion engine and / or the vehicle, which drives the internal combustion engine to change.

Eine andere vorteilhafte Ausgestaltung des Verfahrens, bei der ein erhöhter Mengenbedarf beispielsweise beim Anfahren erkannt wird, sieht vor, dass die Ansteuerdauer auf einen größeren Wert umgeschaltet wird in Abhängigkeit von Signalen, welche die Stellung einer Kupplung und/oder eines Getriebes und/oder der Geschwindigkeit des Fahrzeugs und/oder der Stellung des Gaspedals charakterisiert.Another advantageous embodiment of the method, in which an increased quantity requirement is detected, for example, during start-up, provides that the activation duration is switched to a greater value as a function of signals indicating the position of a clutch and / or a transmission and / or the speed of the vehicle and / or the position of the accelerator pedal.

Bevorzugt wird die Ansteuerdauer in Stufen und zwar in Abhängigkeit von der Gaspedalstellung verändert. Dabei sind vorzugsweise drei Stufen vorgesehen, d.h. es wird nur auf große Änderungen des Gaspedals reagiert. In einer ersten Stufe wird die Ansteuerdauer verlängert, wenn eine einen Beschleunigungsvorgang des Fahrzeugs charakterisierende Gaspedalstellung vorliegt. Bei einer zweiten Stufe wird die Ansteuerdauer nicht verändert, wenn eine eine konstante Geschwindigkeit des Fahrzeugs charakterisierende Gaspedalstellung vorliegt. Und in einer dritten Stellung wird die Ansteuerdauer reduziert bei einer eine Verringerung der Geschwindigkeit charakterisierenden Gaspedalstellung.The activation duration is preferably changed in stages, specifically as a function of the accelerator pedal position. There are preferably three stages provided, i. it only reacts to big changes of the gas pedal. In a first stage, the activation duration is extended if an accelerator operation characterizing an acceleration process of the vehicle is present. In a second stage, the driving time is not changed when there is an accelerator pedal position characterizing a constant speed of the vehicle. And in a third position, the drive duration is reduced at a throttle speed characterizing accelerator pedal position.

Darüber hinaus kann eine schnelle Anpassung der Zumesseinheit vorgesehen sein, beispielsweise bei Erkennung von kritischen Betriebspunkten, wenn z.B. das Kupplungspedal betätigt wird. In diesem Falle kann eine erhöhte Kraftstofffördermenge von der Zumesseinheit - z.B. zum Anfahren - eingestellt werden.In addition, a rapid adaptation of the metering unit may be provided, for example, upon detection of critical operating points, e.g. the clutch pedal is pressed. In this case, an increased fuel delivery amount from the metering unit - e.g. to start - to be set.

Weitere Vorteile und Merkmale der Erfindung sind Gegenstand der nachfolgenden Beschreibung sowie der zeichnerischen Darstellung eines Ausführungsbeispiels der Erfindung.Further advantages and features of the invention are the subject of the following description and the drawings of an embodiment of the invention.

Zeichnungdrawing

In der Figur ist schematisch ein Blockschaltbild eines Einspritzsystems einer Brennkraftmaschine zur Erläuterung des erfindungsgemäßen Verfahrens dargestellt.In the figure, a block diagram of an injection system of an internal combustion engine for explaining the method according to the invention is shown schematically.

Beschreibung von AusführungsbeispielenDescription of exemplary embodiments

In der Figur ist schematisch ein Ausführungsbeispiel eines Einspritzsystems einer Brennkraftmaschine 310 dargestellt. Die Brennkraftmaschine 310 weist steuerbare Injektoren 321, 322, 323, 324 auf, mittels denen Kraftstoff in die Brennräume 331, 332, 333, 334 der Brennkraftmaschine 310 eingespritzt wird. Der Kraftstoff wird unter hohem Druck in die Brennräume 331, 332, 333, 334 eingespritzt. Hierzu ist ein Speicher 300 vorgesehen, ein sogenanntes Rail, in welchem der Kraftstoff unter hohem Druck gespeichert ist. Sämtliche Einspritzventile 321, 322, 323, 324 werden von diesem Speicher 300 gespeist. Der Druck in dem Speicher 300 wird von einer Förderpumpe 210 erzeugt, deren Zulauf von einer Zumesseinheit 200 gesteuert wird. In dem Speicher 300 ist ein Drucksensor 305 angeordnet, dessen Ausgangssignal einem Raildruckregler 110, der Teil eines Steuergeräts 400 ist, zugeführt wird. Der Raildruckregler 110 ermittelt eine Stellgröße 120 der Zumesseinheit 200, welche abhängig von einer Raildruckregelabweichung ermittelt wird.In the figure, an embodiment of an injection system of an internal combustion engine 310 is shown schematically. The internal combustion engine 310 has controllable injectors 321, 322, 323, 324, by means of which fuel is injected into the combustion chambers 331, 332, 333, 334 of the internal combustion engine 310. The fuel is injected under high pressure into the combustion chambers 331, 332, 333, 334. For this purpose, a memory 300 is provided, a so-called rail, in which the fuel is stored under high pressure. All injectors 321, 322, 323, 324 are powered by this memory 300. The pressure in the reservoir 300 is generated by a feed pump 210 whose feed is controlled by a metering unit 200. In the memory 300, a pressure sensor 305 is arranged, the output signal of which is supplied to a rail pressure regulator 110, which is part of a control unit 400. The rail pressure controller 110 determines a manipulated variable 120 of the metering unit 200, which is determined as a function of a rail pressure control deviation.

Um nun einen Notlaufbetrieb der Brennkraftmaschine 310 bei einem Ausfall des Drucksensors 305 zu gewährleisten, werden dem Raildruckregler 110 eine Auswahl von Eingangsgrößen, beispielsweise ein den Gaspedalweg charakterisierendes Signal, ein die Kupplungsstellung charakterisierendes Signal, ein den eingelegten Gang eines Getriebes charakterisierendes Signal zugeführt, wie in der Figur schematisch durch einen Block 130 angedeutet.In order to ensure emergency operation of the internal combustion engine 310 in the event of failure of the pressure sensor 305, the rail pressure regulator 110 is supplied with a selection of input variables, for example a signal characterizing the gas pedal travel, a signal characterizing the clutch position, a signal characterizing the engaged gear of a transmission, as in FIG the figure schematically indicated by a block 130.

In einem Modul 410 des Steuergeräts 400 wird ferner die Ansteuerdauer der Injektoren 321, 322, 323, 324 berechnet.In a module 410 of the control device 400, the drive duration of the injectors 321, 322, 323, 324 is also calculated.

Bei einem Ausfall des Drucksensors 305, der im Steuergerät 400 erfasst wird, wird nun die Ansteuerdauer der Injektoren 321, 322, 323, 324 auf dem zu diesem Zeitpunkt herrschenden Wert der Ansteuerdauern konstant gehalten, oder es wird wahlweise auf eine für das Notfahren sinnvolle Ansteuerdauer umgeschaltet. Gleichzeitig wird die Drehzahl der Brennkraftmaschine durch eine Stellgröße der Zumesseinheit 200 auf einen konstanten Wert auf nachfolgend beschriebene Weise geregelt. Hierzu wird abhängig von der Gaspedalstellung eine Solldrehzahl 150 vorgegeben. Die Solldrehzahl 150 wird in einem Rechenglied 160, das Teil des Steuergeräts 400 ist, von der aktuell herrschenden Drehzahl 140 subtrahiert. Im Raildruckregler 110 wird nun diese Differenz (Regelabweichung) auf den Wert 0 geregelt, sodass die aktuelle Drehzahl 140 der Solldrehzahl 150 entspricht. Für die Solldrehzahl 150 für den Notfahrbetrieb sind in dem Steuergerät eine oder mehrere konstante Werte hinterlegt, die in Abhängigkeit von dem Betriebszustand vorgegeben werden. Die aktuelle Drehzahl 140 wird also nur durch eine Veränderung des Druckes im Rail 300 konstant gehalten, welcher über die Stellung der Zumesseinheit 200 verändert wird.In case of failure of the pressure sensor 305, which is detected in the control unit 400, now the drive duration of the injectors 321, 322, 323, 324 on the for this Time prevailing value of Ansteuerdauern kept constant, or it is optionally switched to a meaningful for the emergency driving time. At the same time, the rotational speed of the internal combustion engine is regulated by a manipulated variable of the metering unit 200 to a constant value in the manner described below. For this purpose, a target speed 150 is specified depending on the accelerator pedal position. The desired speed 150 is subtracted from the currently prevailing speed 140 in a computing element 160 that is part of the controller 400. In the rail pressure controller 110, this difference (control deviation) is now regulated to the value 0, so that the current speed 140 corresponds to the setpoint speed 150. For the setpoint speed 150 for the emergency driving operation, one or more constant values are stored in the control unit, which values are predefined as a function of the operating state. The current speed 140 is therefore kept constant only by a change in the pressure in the rail 300, which is changed by the position of the metering unit 200.

In einer ersten Stufe, die auf ein Beschleunigen des Fahrzeugs schließen lässt, beispielsweise bei einer Betätigung des Gaspedals im Sinne einer Vergrößerung des Gaspedalwegs, wird eine längere Ansteuerdauer vorgegeben. Bei einem Betriebszustand, der bei unveränderter Gaspedalstellung auf eine unveränderte Geschwindigkeit des Fahrzeugs schließen lässt, wird die Ansteuerdauer beibehalten. Im Falle eines Betriebszustands des Kraftfahrzeugs, welcher auf eine Verringerung der Geschwindigkeit schließen lässt, wenn also das Gaspedal derart betätigt wird, dass der Gaspedalweg verkleinert wird - also "Gas weggenommen" wird -, wird die Ansteuerdauer durch die Zumesseinheit 200 verringert.In a first stage, which is indicative of an acceleration of the vehicle, for example during an actuation of the accelerator pedal in the sense of increasing the accelerator pedal travel, a longer actuation duration is predetermined. In an operating state, which can be concluded with an unchanged accelerator pedal position on an unchanged speed of the vehicle, the driving time is maintained. In the case of an operating state of the motor vehicle, which is indicative of a reduction in the speed, that is, when the accelerator pedal is operated so that the accelerator pedal travel is reduced - ie "gas taken away" -, the driving time is reduced by the metering unit 200.

Eine Änderung der Ansteuerdauer kann auch in Abhängigkeit vom Kupplungspedalweg oder von der Getriebeinformation sowie unmittelbar von der Fahrgeschwindigkeit vorgenommen werden. So kann beispielsweise bei einer Erhöhung der Fahrgeschwindigkeit oder bei einer Änderung der Getriebeübersetzung auf eine größere Ansteuerdauer z.B. mittels einer Rampe umgeschaltet werden.A change in the activation duration can also be carried out as a function of the clutch pedal travel or of the transmission information as well as directly on the driving speed. For example, when the vehicle speed is increased or the transmission ratio is changed to a longer driving time, e.g. be switched by means of a ramp.

Claims (7)

Verfahren zum Betreiben eines Einspritzsystems einer Brennkraftmaschine, bei dem Kraftstoff mittels einer Pumpe, deren Zulauf von einer Zumesseinheit (200) gesteuert wird, in einen Speicher (300) gefördert wird und von dort mittels steuerbarer Injektoren (321, 322, 323, 324) in Brennräume (331, 332, 333, 334) der Brennkraftmaschine (310) eingespritzt wird, wobei ein Drucksensor (305) ein Drucksignal bereitstellt, das den Druck im Speicher (300) charakterisiert, dadurch gekennzeichnet, dass bei einem Ausfall des Drucksensors (305) die Ansteuerdauer der Injektoren (321, 322, 323, 324) konstant gehalten wird und die Drehzahl der Brennkraftmaschine (310) durch eine Stellgröße der Zumesseinheit (200) auf einen konstanten Wert geregelt wird.A method for operating an injection system of an internal combustion engine, wherein the fuel is conveyed by means of a pump whose feed is controlled by a metering unit (200) in a memory (300) and from there by means of controllable injectors (321, 322, 323, 324) in Combustion chambers (331, 332, 333, 334) of the internal combustion engine (310) is injected, wherein a pressure sensor (305) provides a pressure signal, which characterizes the pressure in the memory (300), characterized in that in case of failure of the pressure sensor (305) the control duration of the injectors (321, 322, 323, 324) is kept constant and the speed of the internal combustion engine (310) is controlled by a manipulated variable of the metering unit (200) to a constant value. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Ansteuerdauer der Injektoren (321, 322, 323, 324) abhängig vom Betriebszustand der Brennkraftmaschine (310) und/oder des Fahrzeugs, welches die Brennkraftmaschine (310) antreibt, verändert wird.A method according to claim 1, characterized in that the activation duration of the injectors (321, 322, 323, 324) depending on the operating state of the internal combustion engine (310) and / or of the vehicle, which drives the internal combustion engine (310) is changed. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Ansteuerdauer auf einen größeren Wert umgeschaltet wird in Abhängigkeit von Signalen, welche die Stellung einer Kupplung und/oder eines Getriebes und/oder der Geschwindigkeit des Fahrzeugs und/oder der Stellung des Gaspedals charakterisieren.A method according to claim 2, characterized in that the drive time is switched to a larger value in response to signals which characterize the position of a clutch and / or a transmission and / or the speed of the vehicle and / or the position of the accelerator pedal. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Ansteuerdauer in Stufen in Abhängigkeit von der Gaspedalstellung verändert wird.A method according to claim 3, characterized in that the driving time is varied in stages in dependence on the accelerator pedal position. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Ansteuerdauer in Abhängigkeit von der Gaspedalstellung in drei Stufen geändert wird derart, dass die Ansteuerdauer verlängert wird, wenn eine einen Beschleunigungsvorgang des Fahrzeugs charakterisierende Gaspedalstellung vorliegt, die Ansteuerdauer nicht verändert wird bei einer eine konstante Geschwindigkeit des Fahrzeugs charakterisierenden Gaspedalstellung und die Ansteuerdauer reduziert wird bei einer eine Verringerung der Geschwindigkeit charakterisierenden Gaspedalstellung.A method according to claim 4, characterized in that the driving time is changed depending on the accelerator pedal position in three stages such that the driving time is extended when an accelerating operation of the vehicle characterizing accelerator pedal position, the driving time is not changed at a constant speed of Vehicle characterizing accelerator pedal position and the driving time is reduced at a speed reduction characterizing accelerator pedal position. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Zumesseinheit (200) steuerbar ist in Abhängigkeit von Betriebspunkten der Brennkraftmaschine (310).Method according to one of the preceding claims, characterized in that the metering unit (200) is controllable in dependence on operating points of the internal combustion engine (310). Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass eine erhöhte Kraftstofffördermenge von der Zumesseinheit (200) eingestellt wird im Falle einer Kupplungsbetätigung.A method according to claim 6, characterized in that an increased fuel delivery amount of the metering unit (200) is set in the case of a clutch operation.
EP20070100580 2006-02-28 2007-01-16 Method for operating an injection system for a combustion engine Expired - Fee Related EP1826385B1 (en)

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