EP1005609B1 - Method for controlling exhaust gas recirculation in an internal combustion engine - Google Patents

Method for controlling exhaust gas recirculation in an internal combustion engine Download PDF

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Publication number
EP1005609B1
EP1005609B1 EP98933582A EP98933582A EP1005609B1 EP 1005609 B1 EP1005609 B1 EP 1005609B1 EP 98933582 A EP98933582 A EP 98933582A EP 98933582 A EP98933582 A EP 98933582A EP 1005609 B1 EP1005609 B1 EP 1005609B1
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Prior art keywords
signal
correction
engine
basic
vehicle
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EP98933582A
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German (de)
French (fr)
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EP1005609A1 (en
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Bernd Hülsmann
Martin Lutat
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Deutz AG
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Deutz AG
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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
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of 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
    • F02D41/02—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
    • F02D41/1402—Adaptive control
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M2026/001—Arrangements; Control features; Details
    • F02M2026/004—EGR valve controlled by a temperature signal or an air/fuel ratio (lambda) signal

Definitions

  • the invention relates to a method and a device for controlling the exhaust gas recirculation in a self-igniting internal combustion engine in particular, which has a crankcase, at least one cylinder and a cylinder head with an intake line and an exhaust gas line, which can be connected via an exhaust gas recirculation line, the exhaust gas recirculation rate from a control device is controlled as a function of operating parameters of the internal combustion engine, the control device having a basic map with the parameters engine speed n e and the amount of fuel delivered f f per work cycle, a vehicle acceleration correction device also emitting a vehicle acceleration correction signal and the basic signals of the basic map being emitted by correction signals further correction devices that can be activated as required can be influenced.
  • Such a method for controlling the exhaust gas recirculation is off DE-A 196 31 112 known. It is according to this document provide a control device for an internal combustion engine so that when a change in the operating conditions of the Engine or acceleration of the fuel injection timing control is predicted. For this, from a basic map based on the speed and fuel quantity is spanned, with corrections depending on the acceleration / dynamics of the coolant temperature and / or the speed are provided. These corrections are as multiplicative or additive corrections are provided. Furthermore is a arbitrarily adapted factor provided for the circumstances. In Agreement with a difference between an actual Fuel injection timing and the predicted target fuel injection timing a target exhaust gas recirculation area, i. H. a Exhaust gas recirculation quantity or rate, corrected.
  • a target exhaust gas recirculation area i. H. a Exhaust gas recirculation quantity or rate
  • the invention is based, a method and a task Device for controlling the exhaust gas recirculation in an internal combustion engine to provide the most diverse operating conditions an internal combustion engine can take into account.
  • a use correction device which outputs a usage correction signal that corresponds to the basic signal is applied multiplicatively.
  • This usage correction device generally takes into account the intended purpose the internal combustion engine and sets corrective signals for this with which the basic signals are superimposed. Possible Uses are, for example, the use of the internal combustion engine in a vehicle, an agricultural machine a construction vehicle or device.
  • a further development of the invention is an internal combustion engine acceptance correction device provided that also corresponding Issues correction signals.
  • this correction device are consequently during the acceptance run of the internal combustion engine after its manufacture and assembly stored basic correction values that especially on the respective acceptance run of the internal combustion engine are tailored. These include basic values too understand the type and design of the internal combustion engine.
  • a vehicle data correction device is also provided. In This can then be relevant vehicle data, such as Vehicle data and area of application can be saved.
  • An ambient pressure correction device is also provided, which in particular when using the internal combustion engine or the vehicle is used in the mountains.
  • a coolant temperature correction device provided the coolant temperature of the internal combustion engine taken into account when controlling exhaust gas recirculation.
  • a dynamic correction device that takes into account the driving style of the driver of a vehicle.
  • this dynamic correction signal go the speed of the internal combustion engine and the amount of fuel supplied per cycle, where it is determined from both whether there is a stationary driving state or an extreme driving style (accelerator pedal change between Zero position and full load position). If this facility The existence of dynamic operation is determined, the difference a correction value for the previous signals with this device added to the basic signal.
  • each individual point of the characteristic curve defines a specific exhaust gas recirculation rate. This respective point is determined by the input variables “speed of the internal combustion engine n e ” and “fuel quantity m f supplied to the internal combustion engine per work cycle”.
  • the quantity of fuel supplied m f per work cycle is defined as the quantity of fuel supplied per stroke of one of the injection pump elements of the internal combustion engine.
  • the basic output signal from this basic characteristic diagram 1 determines the exhaust gas recirculation quantity as a function of the input variables mentioned.
  • This basic signal can be influenced by the correction devices explained below, which emit corresponding correction signals, and thus the actual exhaust gas recirculation rate can be adapted to the given operating conditions of the internal combustion engine.
  • an adjustment is made by three correction devices, the basic parameters when operating the internal combustion engine and take into account the multiplicative of the basic signal become.
  • This is initially an engine usage correction device 2, according to the performance group and / or the intended use of the internal combustion engine, for example in a commercial vehicle, in an agricultural one Machine, in a construction vehicle or device, a corresponding Engine use correction signal.
  • This corresponding signal can be in a central electronics control device, in which the entire system can be integrated become.
  • an internal combustion engine acceptance correction device 3 which has a corresponding correction signal, that created during the acceptance run of the internal combustion engine will give up.
  • this correction signal u. a. in particular Engine-specific data, such as the number of cylinders, Art the injector, etc., find influence.
  • Vehicle data correction device 4 is provided, which is a vehicle-specific Issues correction signal.
  • this Correction device can contain relevant vehicle-specific data, such as the special intake and exhaust system, but possibly also vehicle weight, gear ratios and area of application (e.g. construction site, local or long-distance traffic), Find influence.
  • An ambient pressure correction device 5 is also provided, in which a correction curve dependent on the measured ambient pressure p a is stored. This takes into account, in particular, the ambient pressure p a falling with increasing height, which has a direct influence on the filling of the internal combustion engine and thus the combustion.
  • a vehicle acceleration correction device 6 which processes various input signals explained below and ultimately emits a corresponding correction signal, which represents an acceleration evaluation.
  • Two comparators 7a, 7b are provided at the input of the vehicle acceleration correction device, the comparator 7a receiving a measured value m s for the accelerator pedal position, which is compared with an injection pump regulator preset value m d , which represents a torque limit, and emits an output signal when exceeded.
  • the injection pump regulator default value m d is directly input into the comparator 7b, this value being compared here with a regulator default value m r , which corresponds to a smoke limit value, and if a limit value is exceeded, an output signal is also output from the comparator 7b.
  • the output signals of the two comparators 7a, 7b are combined in an AND element 8, the AND element emitting a switching signal from both comparators 7a and 7b in the presence of a disturbance variable, corresponding to an output signal.
  • This switching signal is fed to an actuating element 9, the actuating element 9 connecting the output of the actuating element 9 to an input 0, the input signal of which is described below, when an output signal from the AND element 8 is present.
  • the input of the actuator 9 is connected to the input 1, so that no vehicle acceleration correction signal is delivered.
  • This evaluation device 10 has a characteristic curve which determines the extent of the closing of the exhaust gas recirculation as a function of the incoming signal.
  • the output signal of the evaluation device 10 is - as stated above - applied as a vehicle acceleration correction signal to the output signals of the basic map 1 via the actuator 9.
  • an internal combustion engine coolant temperature correction device 11 is provided, into which the current coolant temperature t w is input and which determines and emits a correction signal from a correction curve. In this case, it can also be determined whether the internal combustion engine is in the warm-up phase after a cold start.
  • a dynamic correction device 12 which likewise emits a correction signal, but which, in contrast to the previous signals, is added to the basic signal.
  • This correction value is determined from the speed n e of the internal combustion engine and the supplied fuel mass m f per work cycle, the speed n e of the internal combustion engine being fed to a speed-dependent correction characteristic curve 13 and the supplied fuel mass m f to a damped differentiator 14.
  • the output signal of the damped differentiating element 14 is forwarded to a minimum / maximum limiter 15, values between 0 and 1 being output as output values.
  • the value 0 represents a stationary driving state and the value 1 an extreme driving state.
  • the value 0 can be compared with a quiet driving style with a constant accelerator pedal position, while the value 1 can be compared with a very restless driving style with a constantly moving accelerator pedal leaves. All values between 0 and 1 are permissible and are processed.
  • a device 16 which takes into account whether the engine brake is on or off or whether it is on Start process is present. Is the engine brake switched on or is it engaged? Engine start before, the switch 17 is switched to input 0, so that the exhaust gas recirculation during these operating states is also out of order.

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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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Steuerung der Abgasrückführung bei einer insbesondere selbstzündenden Brennkraftmaschine, die ein Kurbelgehäuse, zumindest einen Zylinder und einen Zylinderkopf mit einer Ansaugleitung und einer Abgasleitung, die über eine Abgasrückführleitung verbindbar sind, aufweist, wobei die Abgasrückführrate von einer Steuereinrichtung in Abhängigkeit von Betriebsparametern der Brennkraftmaschine gesteuert wird, wobei die Steuereinrichtung ein Grundkennfeld mit den Parametern Brennkraftmaschinen-Drehzahl ne und je Arbeitsspiel geförderte Kraftstoffmenge mf aufweist, weiterhin eine Fahrzeugbeschleunigungs-Korrektureinrichtung ein Fahrzeugbeschleunigungs-Korrektursignal abgibt und wobei die Grundsignale des Grundkennfeldes durch Korrektursignale abgebende weitere bedarfsmäßig zuschaltbare Korrektureinrichtungen beeinflußbar sind.The invention relates to a method and a device for controlling the exhaust gas recirculation in a self-igniting internal combustion engine in particular, which has a crankcase, at least one cylinder and a cylinder head with an intake line and an exhaust gas line, which can be connected via an exhaust gas recirculation line, the exhaust gas recirculation rate from a control device is controlled as a function of operating parameters of the internal combustion engine, the control device having a basic map with the parameters engine speed n e and the amount of fuel delivered f f per work cycle, a vehicle acceleration correction device also emitting a vehicle acceleration correction signal and the basic signals of the basic map being emitted by correction signals further correction devices that can be activated as required can be influenced.

Ein derartiges Verfahren zur Steuerung der Abgasrückführung ist aus der DE-A 196 31 112 bekannt. Dabei ist gemäß diesem Dokument eine Steuervorrichtung für einen Verbrennungsmotor so beschaffen, daß bei Erfassung einer Veränderung der Betriebsbedingungen des Motors oder bei einer Beschleunigung eine Verzögerung der Kraftstoffeinspritzzeitpunkt-Steuerung vorhergesagt wird. Hierzu wird von einem Grundkennfeld ausgegangen, das in Abhängigkeit von Drehzahl und Kraftstoffmenge aufgespannt ist, wobei Korrekturen in Abhängigkeit von der Beschieunigung/Dynamik der Kühlmitteltemperatur und/oder der Drehzahl vorgesehen sind. Diese Korrekturen sind als multiplikative oder additive Korrekturen vorgesehen. Weiterhin ist ein willkürlich den Gegebenheiten angepasster Faktor vorgesehen. In Übereinstimmung mit einer Differenz zwischen einem tatsächlichen Kraftstoffeinspritzzeitpunkt und dem vorhergesagten Soll-Kraftstoffeinspritzzeitpunkt wird ein Soll-Abgasrückführungs-Bereich, d. h. eine Abgasrückführungs-Menge oder -Rate, korrigiert. Such a method for controlling the exhaust gas recirculation is off DE-A 196 31 112 known. It is according to this document provide a control device for an internal combustion engine so that when a change in the operating conditions of the Engine or acceleration of the fuel injection timing control is predicted. For this, from a basic map based on the speed and fuel quantity is spanned, with corrections depending on the acceleration / dynamics of the coolant temperature and / or the speed are provided. These corrections are as multiplicative or additive corrections are provided. Furthermore is a arbitrarily adapted factor provided for the circumstances. In Agreement with a difference between an actual Fuel injection timing and the predicted target fuel injection timing a target exhaust gas recirculation area, i. H. a Exhaust gas recirculation quantity or rate, corrected.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Steuerung der Abgasrückführung bei einer Brennkraftmaschine bereitzustellen, das/die die verschiedensten Einsatzbedingungen einer Brennkraftmaschine berücksichtigen kann.The invention is based, a method and a task Device for controlling the exhaust gas recirculation in an internal combustion engine to provide the most diverse operating conditions an internal combustion engine can take into account.

Diese Aufgabe wird dadurch gelöst, daß das Fahrzeugbeschleunigungs-Korrektursignal dem Grundsignal muttiplikativ aufgeschaltet wird, daß die Fahrzeugbeschleunigungs-Korrektureinrichtung die Parameter:

  • a) Einspritzpumpenreglervorgabe,
  • b) Gaspedalstellung,
  • c) Reglervorgabe entsprechend der Rauchgrenze
    • berücksichtigt, und daß dann, wenn b) > a) und a) > c) ist, eine Störgröße vorliegt, die entsprechend den bewerteten Parametern a) und c) berücksichtigt wird. In dem Grundkennfeld sind über den zuvor genannten Parametern Kennlinien abgelegt, die die Grundsignale festlegen. Schon mit diesen Grundsignalen kann zumindest bei bestimmten Einsätzen der Brennkraftmaschine die Abgasrückführung gesteuert werden, wobei auch vorgesehen ist, daß beispielsweise bei einem Störfall durch beispielsweise defekte Sensoren für eine oder mehrere Korrektureinrichtungen ein "Notprogramm" nach den Grundsignalen gefahren wird. In den meisten Anwendungsfällen der Brennkraftmaschine wird gemäß der vorliegenden Erfindung das Grundkennfeld durch Korrektursignale abgebende Korrektureinrichtungen bedarfsmäßig beeinflußt. So ist es vorteilhaft vorgesehen, in dem Grundkennfeld die Abgasrückführwerte allgemein für verschiedene Brennkraftmaschinen abzulegen, wobei dann diese Grundsignale je nach Bauart und Ausführung der Brennkraftmaschine (Zylinderzahl, eingestellte Leistung usw.) und den nachfolgend beschriebenen sonstigen Korrektureinrichtungen beeinflußbar sind. Durch diese Ausbildung kann immer die gleiche Vorrichtung verwendet werden und die Teilevielfalt gering gehalten werden. Immer ist eine Fahrzeugbeschleunigungs-Korrektureinrichtung vorgesehen, die die Parameter: Einspritzpumpenreglervorgabe, Gaspedalstellung und Rauchgrenze berücksichtigt. Hierbei werden dann in jeweils einem Komperator die aktuelle Gaspedalstellung mit der Einspritzpumpenreglervorgabe und die Rauchgrenze mit der Einspritzpumpenreglervorgabe verglichen. Wenn bei dem Vergleich in beiden Komperatoren festgestellt wird, daß vorgebbare Einstellungen überschritten werden, wird das Ausgangssignal jeweils als Störgröße erfaßt, wobei die beiden Ausgangsstörgrößen in einem Und-Glied zusammengefaßt werden. D. h., nur wenn bei beiden Komperatoren eine Störgröße vorliegt, wird hinter dem Und-Glied ein weiterer Schalter betätigt. Gleichzeitig werden die Einspritzpumpenreglervorgabe und die Rauchgrenze in einem Divisor zusammengeführt und entsprechend dem sich ergebenden Wert wird aus einer nachfolgenden Bewertungskurve ein Wert für das Maß der Schließung der Abgasrückführung entnommen. Dieser Wert wird dann multiplikativ auf das Grundsignal aufgeschaltet, wenn dem zuvor erläuterten Schalter das Vorliegen einer Störgröße signalisiert wird.This object is achieved in that the vehicle acceleration correction signal is applied in a multiplicative manner to the basic signal, and in that the vehicle acceleration correction device has the parameters:
  • a) Injection pump regulator specification,
  • b) accelerator pedal position,
  • c) Controller specification according to the smoke limit
    • taken into account, and that when b)> a) and a)> c) there is a disturbance variable which is taken into account in accordance with the evaluated parameters a) and c). In the basic map, characteristic curves are stored above the parameters mentioned above, which define the basic signals. Even with these basic signals, the exhaust gas recirculation can be controlled at least for certain uses of the internal combustion engine, it also being provided that, for example in the event of a malfunction, for example defective sensors for one or more correction devices, an "emergency program" is run according to the basic signals. In most applications of the internal combustion engine, the basic map is influenced as required by correction devices emitting correction signals. For example, it is advantageously provided that the exhaust gas recirculation values are generally stored in the basic characteristic diagram for various internal combustion engines, these basic signals then being able to be influenced depending on the type and design of the internal combustion engine (number of cylinders, set output, etc.) and the other correction devices described below. With this design, the same device can always be used and the number of parts can be kept low. A vehicle acceleration correction device is always provided, which takes into account the parameters: injection pump controller specification, accelerator pedal position and smoke limit. The current accelerator pedal position is then compared with the injection pump regulator specification and the smoke limit with the injection pump regulator specification in a comparator. If it is determined in the comparison in both comparators that predeterminable settings are exceeded, the output signal is in each case detected as a disturbance variable, the two output disturbance variables being combined in an AND element. In other words, only if there is a disturbance variable in both comparators is a further switch operated behind the AND gate. At the same time, the injection pump regulator specification and the smoke limit are combined in a divisor and, according to the resulting value, a value for the degree of closure of the exhaust gas recirculation is taken from a subsequent evaluation curve. This value is then applied multiplicatively to the basic signal when the presence of a disturbance variable is signaled to the previously explained switch.

    In Weiterbildung ist eine Verwendungs-Korrektureinrichtung vorgesehen, die ein Verwendungs-Korrektursignal abgibt, das dem Grundsignal multiplikativ aufgeschaltet wird. Diese Verwendungs-Korrektureinrichtung berücksichtigt also ganz allgemein den vorgegebenen Verwendungszweck der Brennkraftmaschine und legt hierfür korrektursignale fest, mit denen die Grundsignale überfagert werden. Mögliche Verwendungszwecke sind beispielsweise der Einsatz der Brennkraftmaschine in einem Fahrzeug, einer landwirtschaftlichen Maschine einem Baufahrzeug oder einem Gerät.In a further development, a use correction device is provided, which outputs a usage correction signal that corresponds to the basic signal is applied multiplicatively. This usage correction device generally takes into account the intended purpose the internal combustion engine and sets corrective signals for this with which the basic signals are superimposed. Possible Uses are, for example, the use of the internal combustion engine in a vehicle, an agricultural machine a construction vehicle or device.

    In Weiterbildung der Erfindung ist eine Brennkraftmaschinen-Abnahme-Korrektureinrichtung vorgesehen, die ebenfalls entsprechende Korrektursignale abgibt. In diese Korrektureinrichtung werden folglich bei dem Abnahmelauf der Brennkraftmaschine nach deren Herstellung und Montage grundlegende Korrekturwerte eingespeichert, die ganz speziell auf den jeweiligen Abnahmelauf der Brennkraftmaschine zugeschnitten sind. Darunter sind auch grundlegende Werte zu dem Typ und der Ausführung der Brennkraftmaschine zu verstehen.A further development of the invention is an internal combustion engine acceptance correction device provided that also corresponding Issues correction signals. In this correction device are consequently during the acceptance run of the internal combustion engine after its manufacture and assembly stored basic correction values that especially on the respective acceptance run of the internal combustion engine are tailored. These include basic values too understand the type and design of the internal combustion engine.

    Weiterhin ist eine Fahrzeugdaten-Korrektureinrichtung vorgesehen. In dieser können dann relevante Fahrzeugdaten, wie beispielsweise Fahrzeugdaten und Einsatzgebiet, abgespeichert werden.A vehicle data correction device is also provided. In This can then be relevant vehicle data, such as Vehicle data and area of application can be saved.

    Weiterhin ist eine Umgebungsdruck-Korrektureinrichtung vorgesehen, die insbesondere bei Einsatz der Brennkraftmaschine bzw. des Fahrzeugs im Gebirge zum Einsatz kommt.An ambient pressure correction device is also provided, which in particular when using the internal combustion engine or the vehicle is used in the mountains.

    In Weiterbildung der Erfindung ist eine Kühlmitteltemperatur-Korrektureinrichtung vorgesehen, die die Kühlmitteltemperatur der Brennkraftmaschine bei der Steuerung der Abgasrückführung berücksichtigt.In a further development of the invention is a coolant temperature correction device provided the coolant temperature of the internal combustion engine taken into account when controlling exhaust gas recirculation.

    Darüber hinaus ist eine Dynamik-Korrektureinrichtung vorgesehen, die die Fahrweise des Fahrers eines Fahrzeuges berücksichtigt. In dieses Dynamik-Korrektursignal gehen die Drehzahl der Brennkraftmaschine und die zugeführte Kraftstoffmenge je Arbeitsspiel ein, wobei aus beiden ermittelt wird, ob ein stationärer Fahrzustand vorliegt oder eine extreme Fahrweise (Gaspedalwechsel andauernd zwischen Nullstellung und Vollaststellung). Wenn bei dieser Einrichtung das Vorliegen eines dynamischen Betriebs ermittelt wird, wird im Unterschied zu den bisherigen Signalen bei dieser Einrichtung ein Korrekturwert auf das Grundsignal aufaddiert.In addition, a dynamic correction device is provided, that takes into account the driving style of the driver of a vehicle. In this dynamic correction signal go the speed of the internal combustion engine and the amount of fuel supplied per cycle, where it is determined from both whether there is a stationary driving state or an extreme driving style (accelerator pedal change between Zero position and full load position). If this facility The existence of dynamic operation is determined, the difference a correction value for the previous signals with this device added to the basic signal.

    Allen diesen Korrektureinrichtungen ist eine Einrichtung nachgeschaltet, die überprüft, ob die Motorbremse des Fahrzeuges eingeschaltet ist. Sofern dies der Fall ist, wird die Abgasrückführung automatisch auf null reduziert bzw. ganz ausgeschaltet. Ebenfalls wird während des Startvorgangs die Abgasrückführung abgeschaltet. All these correction devices are followed by a device which checks whether the engine brake of the vehicle is switched on is. If this is the case, the exhaust gas recirculation becomes automatic reduced to zero or completely switched off. Also will the exhaust gas recirculation switched off during the starting process.

    Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein Ausführungsbeispiel der Erfindung näher beschrieben ist.Further advantageous embodiments of the invention are the description of the drawing can be seen in the an embodiment of the Invention is described in more detail.

    In dem Grundkennfeld 1 sind verschiedene Kennlinien abgespeichert, von denen jeder einzelne Punkt der Kennlinie eine bestimmte Abgasrückführrate festlegt. Dabei wird dieser jeweilige Punkt bestimmt durch die Eingangsgrößen "Drehzahl der Brennkraftmaschine ne" und "der Brennkraftmaschine je Arbeitsspiel zugeführte Kraftstoffmenge mf". Dabei ist im vorliegenden Fall die zugeführte Kraftstoffmenge mf je Arbeitsspiel definiert als zugeführte Kraftstoffmenge je Hub eines der Einspritzpumpenelemente der Brennkraftmaschine. Das Ausgangs-Grundsignal aus diesem Grundkennfeld 1 bestimmt in Abhängigkeit von den genannten Eingangsgrößen die Abgasrückführmenge. Dieses Grundsignal kann durch die nachfolgend erläuterten Korrektureinrichtungen, die entsprechende Korrektursignale abgeben, beeinflußt werden und somit die tatsächliche Abgasrückführrate an gegebene Betriebsbedingungen der Brennkraftmaschine angepaßt werden.Various characteristic curves are stored in the basic characteristic diagram 1, of which each individual point of the characteristic curve defines a specific exhaust gas recirculation rate. This respective point is determined by the input variables “speed of the internal combustion engine n e ” and “fuel quantity m f supplied to the internal combustion engine per work cycle”. In the present case, the quantity of fuel supplied m f per work cycle is defined as the quantity of fuel supplied per stroke of one of the injection pump elements of the internal combustion engine. The basic output signal from this basic characteristic diagram 1 determines the exhaust gas recirculation quantity as a function of the input variables mentioned. This basic signal can be influenced by the correction devices explained below, which emit corresponding correction signals, and thus the actual exhaust gas recirculation rate can be adapted to the given operating conditions of the internal combustion engine.

    Hierbei erfolgt zunächst eine Anpassung durch drei Korrektureinrichtungen, die grundlegende Parameter beim Betrieb der Brennkraftmaschine berücksichtigen und die dem Grundsignal multiplikativ aufgeschaltet werden. Dies ist zunächst eine Brennkraftmaschinen-Verwendungs-Korrektureinrichtung 2, die entsprechend der Leistungsgruppe und/oder dem Verwendungszweck der Brennkraftmaschine, beispielsweise in einem Nutzfahrzeug, in einer landwirtschaftlichen Maschine, in einem Baufahrzeug oder einem Gerät, ein entsprechendes Brennkraftmaschinen-Verwendungs-Korrektursignal abgibt. Dieses entsprechende Signal kann in einer zentralen Elektronik-Steuereinrichtung, in der das gesamte System integriert sein kann, gespeichert werden. Gleiches gilt für eine Brennkraftmaschinen-Abnahme-Korrektureinrichtung 3, die ein entsprechendes Korrektursignal, das bei dem Abnahmelauf der Brennkraftmaschine erstellt wird, abgibt. In diesem Korrektursignal können u. a. insbesondere brennkraftmaschinenspezifische Daten, wie Anzahl der Zylinder, Art der Einspritzvorrichtung usw., Einfluß finden. Weiterhin erfolgt hiermit ein Toleranzausgleich des Abgasrückführsystems. Das entsprechende Korrektursignal wird ebenfalls multiplikativ dem Ausgangssignal des Grundkennfeldes aufgeschaltet. Schließlich ist eine Fahrzeugdaten-Korrektureinrichtung 4 vorgesehen, die ein fahrzeugspezifisches Korrektursignal abgibt. In dieser Korrektureinrichtung können relevante fahrzeugspezifische Daten, wie beispielsweise zu dem speziellen Ansaug- und Abgassystem, aber gegebenenfalls auch Fahrzeuggewicht, Getriebeübersetzungen und Einsatzgebiet (beispielsweise Baustellen-, Nah- oder Fern-Verkehr), Einfluß finden.First, an adjustment is made by three correction devices, the basic parameters when operating the internal combustion engine and take into account the multiplicative of the basic signal become. This is initially an engine usage correction device 2, according to the performance group and / or the intended use of the internal combustion engine, for example in a commercial vehicle, in an agricultural one Machine, in a construction vehicle or device, a corresponding Engine use correction signal. This corresponding signal can be in a central electronics control device, in which the entire system can be integrated become. The same applies to an internal combustion engine acceptance correction device 3, which has a corresponding correction signal, that created during the acceptance run of the internal combustion engine will give up. In this correction signal u. a. in particular Engine-specific data, such as the number of cylinders, Art the injector, etc., find influence. Furthermore, this is done tolerance compensation of the exhaust gas recirculation system. The corresponding The correction signal is also multiplied by the output signal of the basic map. After all, one is Vehicle data correction device 4 is provided, which is a vehicle-specific Issues correction signal. In this Correction device can contain relevant vehicle-specific data, such as the special intake and exhaust system, but possibly also vehicle weight, gear ratios and area of application (e.g. construction site, local or long-distance traffic), Find influence.

    Weiterhin ist eine Umgebungsdruck-Korrektureinrichtung 5 vorgesehen, in der eine vom gemessenen Umgebungsdruck pa abhängige Korrekturkurve abgespeichert ist. Hiermit wird insbesondere der mit zunehmender Höhe abfallende Umgebungsdruck pa, der einen direkten Einfluß auf die Füllung der Brennkraftmaschine und damit die Verbrennung hat, berücksichtigt.An ambient pressure correction device 5 is also provided, in which a correction curve dependent on the measured ambient pressure p a is stored. This takes into account, in particular, the ambient pressure p a falling with increasing height, which has a direct influence on the filling of the internal combustion engine and thus the combustion.

    Darüberhinaus ist eine Fahrzeug-Beschleunigungs-Korrektureinrichtung 6 vorgesehen, die verschiedene nachfolgend erläuterte Eingangssignale verarbeitet und letztendlich ein entsprechendes Korrektursignal, das eine Beschleunigungsbewertung darstellt, abgibt. Eingangs der Fahrzeug-Beschleunigungs-Korrektureinrichtung sind zwei Komperatoren 7a, 7b vorgesehen, wobei in den Komperator 7a ein Messwert ms für die Gaspedalstellung eingeht, der mit einem Einspritzpumpenreglervorgabewert md, der ein Drehmomentlimit darstellt, verglichen wird und bei Überschreiten ein Ausgangssignal abgibt. In dem Komperator 7b geht direkt der Einspritzpumpenreglervorgabewert md ein, wobei dieser Wert hier mit einem Reglervorgabewert mr, der einem Rauchgrenzwert entspricht, verglichen wird und bei Überschreiten eines Grenzwertes ein Ausgangssignal auch aus dem Komperator 7b abgegeben wird. Die Ausgangssignale der beiden Komperatoren 7a, 7b werden in einem Und-Glied 8 zusammengeführt, wobei das Und-Glied beim Vorliegen einer Störgröße - entsprechend einem Ausgangssignal - aus beiden Komperatoren 7a und 7b ein Schaltsignal abgibt. Dieses Schaltsignal wird einem Stell-Glied 9 zugeführt, wobei das Stell-Glied 9 bei Vorliegen eines Ausgangssignals aus dem Und-Glied 8 den Ausgang des Stell-Glieds 9 mit einem Eingang 0, dessen Eingangssignal nachfolgend beschrieben wird, verbindet. Für den Fall, daß keiner oder nur einer der Komperatoren 7a, 7b ein Störsignal abgibt und entsprechend das Und-Glied 8 keine Störgröße meldet, ist der Eingang des Stell-Gliedes 9 auf den Eingang 1 geschaltet, so daß kein Fahrzeug-Beschleunigungs-Korrektursignal abgegeben wird. Für den Fall, daß ein Korrektursignal abgegeben wird, ermittelt sich dieses aus dem Einspritzpumpenreglervorgabewert md und dem Reglervorgabewert mr die beide durch einen Divisor 18 miteinander verbunden werden und in eine Bewertungseinrichtung 10 eingehen. Diese Bewertungseinrichtung 10 weist eine Kennlinie auf, die in Abhängigkeit des eingehenden Signals den Umfang des Schließens der Abgasrückführung festlegt. Das Ausgangssignal der Bewertungseinrichtung 10 wird - wie zuvor ausgeführt - als Fahrzeugbeschleunigungs-Korrektursignal über das Stell-Glied 9 multiplikativ auf die Ausgangssignale des Grundkennfeldes 1 aufgeschaltet. In addition, a vehicle acceleration correction device 6 is provided, which processes various input signals explained below and ultimately emits a corresponding correction signal, which represents an acceleration evaluation. Two comparators 7a, 7b are provided at the input of the vehicle acceleration correction device, the comparator 7a receiving a measured value m s for the accelerator pedal position, which is compared with an injection pump regulator preset value m d , which represents a torque limit, and emits an output signal when exceeded. The injection pump regulator default value m d is directly input into the comparator 7b, this value being compared here with a regulator default value m r , which corresponds to a smoke limit value, and if a limit value is exceeded, an output signal is also output from the comparator 7b. The output signals of the two comparators 7a, 7b are combined in an AND element 8, the AND element emitting a switching signal from both comparators 7a and 7b in the presence of a disturbance variable, corresponding to an output signal. This switching signal is fed to an actuating element 9, the actuating element 9 connecting the output of the actuating element 9 to an input 0, the input signal of which is described below, when an output signal from the AND element 8 is present. In the event that none or only one of the comparators 7a, 7b emits an interference signal and, accordingly, the AND element 8 does not report an interference variable, the input of the actuator 9 is connected to the input 1, so that no vehicle acceleration correction signal is delivered. In the event that a correction signal is emitted, this is determined from the injection pump regulator preset value m d and the regulator preset value m r, which are both connected to one another by a divisor 18 and are received in an evaluation device 10. This evaluation device 10 has a characteristic curve which determines the extent of the closing of the exhaust gas recirculation as a function of the incoming signal. The output signal of the evaluation device 10 is - as stated above - applied as a vehicle acceleration correction signal to the output signals of the basic map 1 via the actuator 9.

    Weiterhin ist eine Brennkraftmaschinen-Kühlmittel-Temperatur-Korrektureinrichtung 11 vorgesehen, in die die aktuelle Kühlmitteltemperatur tw eingeht und aus einer Korrekturkurve ein Korrektursignal bestimmt und abgibt. Hierbei kann dann auch ggf. auch noch festgestellt werden, ob sich die Brennkraftmaschine in der Phase des Warmlaufens nach einem Kaltstart befindet.Furthermore, an internal combustion engine coolant temperature correction device 11 is provided, into which the current coolant temperature t w is input and which determines and emits a correction signal from a correction curve. In this case, it can also be determined whether the internal combustion engine is in the warm-up phase after a cold start.

    Schließlich ist eine Dynamik-Korrektureinrichtung 12 vorgesehen, die ebenfalls ein Korrektursignal abgibt, das aber dem Grundsignal im Unterschied zu den bisherigen Signalen additiv aufgeschaltet wird. Dieser Korrekturwert wird aus der Drehzahl ne der Brennkraftmaschine und der zugeführten Kraftstoffmasse mf je Arbeitsspiel ermittelt, wobei die Drehzahl ne der Brennkraftmaschine einer drehzahlabhängigen Korrekturkennlinie 13 und die zugeführte Kraftstoffmasse mf einem gedämpften Differenzierglied 14 zugeführt wird. Das Ausgangssignal des gedämpften Differenziergliedes 14 wird in einen Minimum/Maximum-Begrenzer 15 weitergeleitet, wobei als Ausgangswerte Werte zwischen 0 und 1 abgegeben werden. Dabei stellt der Wert 0 einen stationären Fahrzustand und der Wert 1 einen extremen Fahrzustand dar. Der Wert 0 läßt sich mit einer ruhigen Fahrweise mit einer konstanten Gaspedal-Stellung vergleichen, während der Wert 1 sich mit einer sehr unruhigen Fahrweise mit einem dauernd bewegten Fahrpedal vergleichen läßt. Alle Werte zwischen 0 und 1 sind zulässig und werden verarbeitet.Finally, a dynamic correction device 12 is provided, which likewise emits a correction signal, but which, in contrast to the previous signals, is added to the basic signal. This correction value is determined from the speed n e of the internal combustion engine and the supplied fuel mass m f per work cycle, the speed n e of the internal combustion engine being fed to a speed-dependent correction characteristic curve 13 and the supplied fuel mass m f to a damped differentiator 14. The output signal of the damped differentiating element 14 is forwarded to a minimum / maximum limiter 15, values between 0 and 1 being output as output values. The value 0 represents a stationary driving state and the value 1 an extreme driving state. The value 0 can be compared with a quiet driving style with a constant accelerator pedal position, while the value 1 can be compared with a very restless driving style with a constantly moving accelerator pedal leaves. All values between 0 and 1 are permissible and are processed.

    Letztendlich ist noch eine Vorrichtung 16 vorgesehen, die berücksichtigt, ob die Motorbremse ein- oder ausgeschaltet ist oder ob ein Startvorgang vorliegt. Ist die Motorbremse eingeschaltet oder liegt ein Motorstart vor, wird der Umschalter 17 auf den Eingang 0 geschaltet, so daß während dieser Betriebszustände die Abgasrückführung ebenfalls außer Betrieb ist.Finally, a device 16 is also provided, which takes into account whether the engine brake is on or off or whether it is on Start process is present. Is the engine brake switched on or is it engaged? Engine start before, the switch 17 is switched to input 0, so that the exhaust gas recirculation during these operating states is also out of order.

    Claims (9)

    1. Method for controlling exhaust-gas recirculation in an internal combustion engine, in particular a compression-ignition engine, which has a crankcase, at least one cylinder and a cylinder head with an intake line and an exhaust line, which can be connected via an exhaust-gas recirculation line, the exhaust-gas recirculation rate being controlled by a control device as a function of operating parameters of the internal combustion engine, the control device having a basic characteristic map incorporating the parameters of engine speed ne and the amount of fuel mf delivered per operating cycle, and a vehicle-acceleration correction device furthermore outputting a vehicle-acceleration correction signal, and it being possible to influence the basic signals of the basic characteristic map by means of further correction devices, which output correction signals and can be connected up as required, characterized in that the vehicle-acceleration correction signal is applied to the basic signal by multiplication, in that the vehicle-acceleration correction device (6) takes account of the following parameters:
      a) injection-pump governor preset,
      b) position of the accelerator pedal,
      c) governor preset in accordance with the smoke limit
      and in that if b) > a) and a) > c), there is a disturbance variable, which is taken into account in accordance with the assessed parameters a) and c).
    2. Method according to Claim 1, characterized in that an engine-use correction device (2) outputs an engine-use correction signal, which is applied to the basic signal by multiplication.
    3. Method according to Claim 1 or 2, characterized in that an engine-acceptance correction device (3) outputs an engine-acceptance correction signal, which is applied to the basic signal by multiplication.
    4. Method according to one of the preceding claims, characterized in that a vehicle-data correction device (4) outputs a vehicle-data correction signal, which is applied to the basic signal by multiplication.
    5. Method according to one of the preceding claims, characterized in that an ambient-pressure correction device (5) outputs an ambient-pressure correction signal, which is applied to the basic signal by multiplication.
    6. Method according to one of the preceding claims, characterized in that an engine coolant-temperature correction device (11) outputs an engine coolant-temperature correction signal, which is applied to the basic signal by multiplication.
    7. Method according to one of the preceding claims, characterized in that a dynamic correction device (12) outputs a dynamic correction signal, which is applied to an engine-speed signal by multiplication, and this dynamic engine-speed correction signal is applied to the basic signal by addition.
    8. Method according to one of the preceding claims, characterized in that exhaust-gas recirculation is stopped when the engine brake is active and during the starting process.
    9. Apparatus for controlling exhaust-gas recirculation in an internal combustion engine, in particular a compression-ignition engine, which has a crankcase, at least one cylinder and a cylinder head with an intake line and an exhaust line, which can be connected via an exhaust-gas recirculation line controlled by a control device as a function of operating parameters of the internal combustion engine, the control device having a basic characteristic map incorporating the parameters of engine speed ne and the amount of fuel mf delivered per operating cycle, and there furthermore being a vehicle-acceleration correction device, which outputs a vehicle-acceleration correction signal, and it being possible to influence the basic signals of the basic characteristic map by means of further correction devices, which output correction signals and can be connected up as required, characterized in that the vehicle-acceleration correction signal, which takes account of the following parameters:
      a) injection-pump governor preset,
      b) position of the accelerator pedal,
      c) governor preset in accordance with the smoke limit,
      is applied to the basic signal by multiplication, and in that if b) > a) and a) > c), there is a disturbance variable, which is taken into account in accordance with the assessed parameters a) and c).
    EP98933582A 1997-08-22 1998-05-30 Method for controlling exhaust gas recirculation in an internal combustion engine Expired - Lifetime EP1005609B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19736522 1997-08-22
    DE19736522A DE19736522A1 (en) 1997-08-22 1997-08-22 Control system for IC engine
    PCT/EP1998/003254 WO1999010644A1 (en) 1997-08-22 1998-05-30 Method for controlling exhaust gas recirculation in an internal combustion engine

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    EP1005609A1 EP1005609A1 (en) 2000-06-07
    EP1005609B1 true EP1005609B1 (en) 2002-09-18

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    EP (1) EP1005609B1 (en)
    JP (1) JP2001514357A (en)
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    JP2001514357A (en) 2001-09-11
    EP1005609A1 (en) 2000-06-07
    WO1999010644A1 (en) 1999-03-04
    CN1267359A (en) 2000-09-20
    US6283101B1 (en) 2001-09-04
    DE19736522A1 (en) 1999-02-25
    CN1088152C (en) 2002-07-24

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