EP0641414B1 - Control system for metering the fuel supply to an internal combustion engine - Google Patents

Control system for metering the fuel supply to an internal combustion engine Download PDF

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Publication number
EP0641414B1
EP0641414B1 EP94907495A EP94907495A EP0641414B1 EP 0641414 B1 EP0641414 B1 EP 0641414B1 EP 94907495 A EP94907495 A EP 94907495A EP 94907495 A EP94907495 A EP 94907495A EP 0641414 B1 EP0641414 B1 EP 0641414B1
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
temperature
control system
time
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EP94907495A
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German (de)
French (fr)
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EP0641414A1 (en
Inventor
Jürgen GRAS
Siegfried Hertzler
Jan-Tian Tjoa
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1486Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1488Inhibiting the regulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/04Introducing corrections for particular operating conditions
    • F02D41/06Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/061Introducing corrections for particular operating conditions for engine starting or warming up the corrections being time dependent
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/04Introducing corrections for particular operating conditions
    • F02D41/06Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/068Introducing corrections for particular operating conditions for engine starting or warming up for warming-up

Definitions

  • the invention is based on a control system for metering fuel an internal combustion engine according to the preamble of the main claim.
  • DE 30 24 also shows 606 Al a "control device for the composition of the in a Internal combustion engine coming for combustion ". This Document teaches lambda control at two different exhaust gas temperatures turn on depending on whether idle is given or not.
  • control system according to the invention with the features of the main claim has the advantage over the known systems in the frame an optimization with good driving behavior of the internal combustion engine Switching on the lambda control at a very early point in time and thereby further reduce pollutant emissions.
  • FIG. 1 shows an overview a control system of an internal combustion engine
  • Figure 2 is a flowchart to determine the switch-on point of the lambda control
  • Figure 3 shows an example of values in connection with the flow chart of Figure 2.
  • FIG. 1 shows an overview of the in connection with system components and operational parameters of the present invention.
  • the internal combustion engine itself is designated 10, her intake pipe with 11 and her exhaust pipe with 12.
  • In the intake pipe 11 lie one behind the other an air mass or Air quantity sensor 14, a throttle valve 15 and an injection valve 16.
  • a lambda probe 18 is attached, which in itself known manner after reaching their operating temperature on the occurrence reacted by oxygen in the exhaust gas.
  • an exhaust gas temperature sensor 25 be attached in the exhaust pipe.
  • the internal combustion engine 10 itself is also a speed sensor 19 as well assigned a temperature sensor 20.
  • a control unit 22 receives Input signals from one connected to the throttle valve 15 standing throttle sensor 24, the air flow sensor 14, the Lambda probe 18, the optionally available exhaust gas temperature sensor 25 and the two sensors 19 and 20 for speed and internal combustion engine temperature TMot. Both the exhaust gas temperature and the The temperature of the catalytic converter can also be modeled within the control unit calculated from other operating parameters of the internal combustion engine will.
  • the control unit 20 At least on the output side, the control unit 20 an injection signal for the at least one injection valve 16 and Ignition signals for the spark plugs of the internal combustion engine not specifically specified to disposal.
  • the structure of a control system for a Internal combustion engine is known, also its mode of operation.
  • Dependent load and speed as well as other operating parameters such as Engine temperature and throttle sensor 24 signal forms the control unit 22 pulse width modulated signals for the at least an injection valve 16 and the ignition signals for the individual Spark plugs.
  • the present invention now specifies measures, such as with regard to a Lambda control starting as quickly as possible in the sense of a possible Low-pollution exhaust measures are taken to the greatest extent possible to achieve optimal results. It is on the beginning mentioned prior art built.
  • Figure 2 shows a flow chart for the determination of the onset point the lambda control based on a control operation afterwards to a starting process.
  • the query is whether a start process is present, designated 30. If there is a starting process, then the following characteristic curves 31 each become two threshold values depending on the engine temperature prevailing at the start time TMot-Start (start temperature) read out.
  • the two threshold values are X0LL for idling (LL) and X0NLL (non-idle case). From a subsequent characteristic curve 32 a duration value TV0 is also dependent on that at the start time prevailing internal combustion engine temperature TMot-Start read out. The subsequent query 33 determines whether since the start time the predetermined period of time TV0 has expired.
  • the mode of operation of the flow chart according to FIG. 2 is explained expediently on the basis of the signal curves shown in FIG. 3.
  • the internal combustion engine temperature is there over the abscissa plotted at the time of the start (start temperature, TMot start).
  • the ordinates form time period TV and a value XO.
  • dashed lines Line are given duration values in their course.
  • two curves are drawn with solid lines, where X0LL for is a temperature curve when idling and X0NLL for one Temperature curve in the case of non-idling.
  • the time duration values TV0 shown in FIG. 3 correspondingly become read from the characteristic curve 32 of the flow chart of FIG. 2. It can be seen that the predeterminable time period increases with increasing Temperature of the internal combustion engine selected to be lower at the start time becomes.
  • a look at Figure 2 illustrates in connection with the curves of Figure 3, the operation of the control system according to the invention.
  • block 31 becomes two characteristic curves the value for the given start temperature Idle case (X0LL) and the value for the non-idle case (X0LL) read out.
  • the readout then takes place in accordance with block 32 a value for a period of time TVO, which also depends on the start temperature is dependent.
  • Query 34 clarifies the question of whether at the time of the corresponding Program run idle case or not.
  • Block 41 of FIG. 2 illustrates various appropriate measures during control operation (block 38). So has turned out to be special expediently highlighted the idle speed setpoint in the warm-up phase to increase a certain delta, further - alternatively or in addition - the reinsertion speed to release the Fuel supply after fuel cut-off in push mode to raise or adjust the ignition late.
  • Block 42 in the flow chart according to FIG. 2 illustrates the possibility of when the control mode is switched on or during the delay its effectiveness a warm-up enrichment factor WL time and / or dependent on the ignition via a ramp or alternatively or additionally in the case of the possibility of adding secondary air, this First switch off the secondary air supply and only then with selectable delay the regulation in block 39 come into effect to let.

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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)
  • Exhaust Gas After Treatment (AREA)

Abstract

The proposal is for a control system for metering the fuel supply to an internal combustion engine. Depending on the starting temperature, time values TVO and threshold values are predetermined preferably for the engine temperature when idling (XOLL) and when non-idling (XONLL). In a preferred embodiment, after a time depending on the starting temperature, an interrogation is made whether the engine temperature has already reached values which correspond to the stored threshold values for idling and non-idling and, depending upon the response, a changeover is made from control to regulation operation of the lambda regulator.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Steuersystem für die Kraftstoffzumessung einer Brennkraftmaschine nach der Gattung des Hauptanspruchs. Bekannt ist aus der DE 28 05 805 C2 ein Verfahren sowie eine Einrichtung zum Betrieb einer Kraftstoffversorgungsanlage mit Lambda-Regelung. Dort ist vorgesehen, die Lambda-Regelung dann einzuschalten, wenn neben der Betriebsbereitschaft der Sonde auch eine bestimmte Brennkraftmaschinentemperatur erreicht worden ist. Die Größe dieser Temperatur ist mit "vorzugsweise 50 bis 85°"angegeben. Ferner zeigt die DE 30 24 606 Al eine "Regeleinrichtung für die Zusammensetzung des in einer Brennkraftmaschine zur Verbrennung kommenden Betriebsgemisches". Dieses Dokument lehrt die Lambda-Regelung bei zwei unterschiedlichen Abgastemperaturen einzuschalten und zwar abhängig davon, ob Leerlauffall gegeben ist oder nicht.The invention is based on a control system for metering fuel an internal combustion engine according to the preamble of the main claim. Known is a method and a device from DE 28 05 805 C2 for operating a fuel supply system with lambda control. There it is provided to switch on the lambda control when next to the operational readiness of the probe also a certain internal combustion engine temperature has been achieved. The size of this temperature is indicated with "preferably 50 to 85 °". DE 30 24 also shows 606 Al a "control device for the composition of the in a Internal combustion engine coming for combustion ". This Document teaches lambda control at two different exhaust gas temperatures turn on depending on whether idle is given or not.

Abhängigkeiten der Umschaltschwelle zwischen Steuerung und Regelung und der Starttemperatur werden auch in der US 4,930,480 und im Abstract der JP 580 726 28 offenbart. Nach dem Abstract wird die Temperatur der Brennkraftmaschine beim Start festgestellt, dann wird ein vorbestimmter Wert hinzuaddiert und es wird dann von Steuerung auf Regelung umgeschaltet, wenn die gemessene Brennkraftmaschinentemperatur die Summe aus Starttemperatur und hinzuaddiertem Wert überschreitet.Dependencies of the switching threshold between control and Regulation and the start temperature are also in the US 4,930,480 and in the abstract of JP 580 726 28. After the abstract, the temperature of the internal combustion engine determined at start, then a predetermined value added and it is then switched from control to regulation, if the measured engine temperature exceeds the sum of the start temperature and the added value.

Es hat sich nun gezeigt, daß diese bekannten Verfahren nicht in allen Betriebszuständen optimal zu arbeiten vermögen. Aufgabe der Erfindung ist es deshalb, ausgehend von diesem Stand der Technik ein Steuersystem für die Kraftstoffzumessung einer Brennkraftmaschine zu schaffen, das vor allem flexibler ist im Vergleich zu den bisher bekannten. It has now been shown that these known methods are not in all Operating conditions are able to work optimally. Object of the invention it is therefore, based on this state of the art, a control system for the fuel metering of an internal combustion engine, which is above all more flexible compared to the previously known.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Steuersystem mit den Merkmalen des Hauptanspruchs hat gegenüber den bekannten Systemen den Vorteil, im Rahmen einer Optimierung bei gutem Fahrverhalten der Brennkraftmaschine die Lambda-Regelung bereits zu einem sehr frühen Zeitpunkt einzuschalten und dadurch die Schadstoffemission weiter zu verringern.The control system according to the invention with the features of the main claim has the advantage over the known systems in the frame an optimization with good driving behavior of the internal combustion engine Switching on the lambda control at a very early point in time and thereby further reduce pollutant emissions.

Weitere Vorteile der Erfindung ergeben sich in Verbindung mit den Unteransprüchen aus der nachfolgenden Beschreibung eines Ausführungsbeispiels.Further advantages of the invention result in connection with the Subclaims from the following description of an embodiment.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung (mit Alternativlösungen) ist in der Zeichnung dargestellt und wird im nachfolgenden näher beschrieben und erläutert. Es zeigen Figur 1 eine Übersichtsdarstellung eines Steuersystems einer Brennkraftmaschine, Figur 2 ein Flußdiagramm zur Bestimmung des Einschaltpunktes der Lambda-Regelung und Figur 3 ein Beispiel für Werte in Verbindung mit dem Flußdiagramm von Figur 2.An embodiment of the invention (with alternative solutions) is shown in the drawing and is described in more detail below and explained. FIG. 1 shows an overview a control system of an internal combustion engine, Figure 2 is a flowchart to determine the switch-on point of the lambda control and Figure 3 shows an example of values in connection with the flow chart of Figure 2.

Beschreibung des AusführungsbeispielesDescription of the embodiment

Figur 1 zeigt in einer Übersichtsdarstellung die im Zusammenhang mit der vorliegenden Erfindung wesentlichen Systemkomponenten und Betriebskenngrößen. Dabei ist die Brennkraftmaschine selbst mit 10 bezeichnet, ihr Ansaugrohr mit 11 und ihr Abgasrohr mit 12. Im Ansaugrohr 11 liegen in Flußrichtung hintereinander ein Luftmassen- oder Luftmengensensor 14, eine Drosselklappe 15 sowie ein Einspritzventil 16. Im Abgasrohr ist eine Lambda-Sonde 18 angebracht, die in an sich bekannter Weise nach Erreichen ihrer Betriebstemperatur auf das Vorkommen von Sauerstoff im Abgas reagiert. Zusätzlich kann ein Abgastemperatursensor 25 im Abgasrohr angebracht sein. Figure 1 shows an overview of the in connection with system components and operational parameters of the present invention. The internal combustion engine itself is designated 10, her intake pipe with 11 and her exhaust pipe with 12. In the intake pipe 11 lie one behind the other an air mass or Air quantity sensor 14, a throttle valve 15 and an injection valve 16. In the exhaust pipe, a lambda probe 18 is attached, which in itself known manner after reaching their operating temperature on the occurrence reacted by oxygen in the exhaust gas. In addition, an exhaust gas temperature sensor 25 be attached in the exhaust pipe.

Der Brennkraftmaschine 10 selbst ist noch ein Drehzahlsensor 19 sowie ein Temperatursensor 20 zugeordnet. Ein Steuergerät 22 erhält Eingangssignale von einem mit der Drosselklappe 15 in Verbindung stehendem Drosselklappensensor 24, dem Luftmengensensor 14, der Lambda-Sonde 18, dem optional vorhandenen Abgastemperatursensor 25 sowie den beiden Sensoren 19 und 20 für Drehzahl und Brennkraftmaschinentemperatur TMot. Sowohl die Abgastemperatur als auch die Temperatur des Katalysators kann auch innerhalb des Steuergeräts modellhaft aus anderen Betriebskenngrößen der Brennkraftmaschine berechnet werden. Ausgangseitig stellt das Steuergerät 20 wenigstens ein Einspritzsignal für das wenigstens eine Einspritzventil 16 sowie Zündsignale für die nicht speziell angegebenen Zündkerzen der Brennkraftmaschine zur Verfügung.The internal combustion engine 10 itself is also a speed sensor 19 as well assigned a temperature sensor 20. A control unit 22 receives Input signals from one connected to the throttle valve 15 standing throttle sensor 24, the air flow sensor 14, the Lambda probe 18, the optionally available exhaust gas temperature sensor 25 and the two sensors 19 and 20 for speed and internal combustion engine temperature TMot. Both the exhaust gas temperature and the The temperature of the catalytic converter can also be modeled within the control unit calculated from other operating parameters of the internal combustion engine will. At least on the output side, the control unit 20 an injection signal for the at least one injection valve 16 and Ignition signals for the spark plugs of the internal combustion engine not specifically specified to disposal.

Die in Figur 1 dargestellte Struktur eines Steuersystems für eine Brennkraftmaschine ist bekannt, ebenfalls ihre Wirkungsweise. Abhängig von Last und Drehzahl sowie weiteren Betriebskenngrößen wie Brennkraftmaschinentemperatur und Signal vom Drosselklappensensor 24 bildet das Steuergerät 22 pulsweitenmodulierte Signale für das wenigstens eine Einspritzventil 16 sowie die Zündsignale für die einzelnen Zündkerzen. Im betriebswarmen Zustand von Brennkraftmaschine und Lambda-Sonde findet eine Regelung der Kraftstoffzumessung auf einen bestimmten Lambda-Wert statt, vorzugsweise Lambda = 1. Die vorliegende Erfindung gibt nun Maßnahmen an, wie im Hinblick auf eine möglichst schnell einsetzende Lambda-Regelung im Sinne eines möglichst schadstoffarmen Abgases Maßnahmen getroffen werden, um möglichst optimale Ergebnisse zu erzielen. Dabei wird auf dem eingangs erwähnten Stand der Technik aufgebaut.The structure of a control system for a Internal combustion engine is known, also its mode of operation. Dependent load and speed as well as other operating parameters such as Engine temperature and throttle sensor 24 signal forms the control unit 22 pulse width modulated signals for the at least an injection valve 16 and the ignition signals for the individual Spark plugs. In the warm operating state of the internal combustion engine and the lambda sensor detects a regulation of the fuel metering a certain lambda value instead, preferably lambda = 1 The present invention now specifies measures, such as with regard to a Lambda control starting as quickly as possible in the sense of a possible Low-pollution exhaust measures are taken to the greatest extent possible to achieve optimal results. It is on the beginning mentioned prior art built.

Figur 2 zeigt ein Flußdiagramm für die Bestimmung des Einsetzpunktes der Lambda-Regelung ausgehend von einem Steuerungsbetrieb im Anschluß an einen Startvorgang. Dabei ist die Abfrage, ob ein Startvorgang vorliegt, mit 30 bezeichnet. Liegt ein Startvorgang vor, dann werden aus nachfolgenden Kennlinien 31 jeweils zwei Schwellwerte abhängig von der zum Startzeitpunkt herrschenden Brennkraftmaschinentemperatur TMot-Start (Starttemperatur) ausgelesen.Figure 2 shows a flow chart for the determination of the onset point the lambda control based on a control operation afterwards to a starting process. The query is whether a start process is present, designated 30. If there is a starting process, then the following characteristic curves 31 each become two threshold values depending on the engine temperature prevailing at the start time TMot-Start (start temperature) read out.

Die beiden Schwellwerte sind X0LL für den Leerlauffall (LL) und X0NLL (Nicht-Leerlauffall). Aus einer nachfolgenden Kennlinie 32 wird ein Zeitdauerwert TV0 ebenfalls abhängig von der zum Startzeitpunkt herrschenden Brennkraftmaschinentemperatur TMot-Start ausgelesen. Die nachfolgende Abfrage 33 bestimmt, ob seit dem Startzeitpunkt die vorgegebene Zeitdauer TV0 abgelaufen ist.The two threshold values are X0LL for idling (LL) and X0NLL (non-idle case). From a subsequent characteristic curve 32 a duration value TV0 is also dependent on that at the start time prevailing internal combustion engine temperature TMot-Start read out. The subsequent query 33 determines whether since the start time the predetermined period of time TV0 has expired.

Ist dies der Fall, wird im folgenden eine Aussage darüber getroffen, ob Leerlauf gegeben ist oder nicht (Abfrage 34). Im Falle eines Leerlaufbetriebs kommt die nachfolgende Abfrage 35 zum Tragen, wo ermittelt wird, ob ein bestimmter Wert X den aus der Kennlinie 31 ausgelesenen Schwellwert X0LL bereits erreicht hat oder nicht. Entsprechend ist eine Abfrage 36 vorgesehen, bei der im Falle des Fahrbetriebs, d. h. Nicht-Leerlaufbetrieb, der Wert X auf das Erreichen des Schwellwerts X0NLL festgestellt wird. Wurden die Schwellwerte in einer der beiden Abfragen 35 und 36 noch nicht erreicht, befindet sich das System weiterhin im Steuerbetrieb (Block 38), andernfalls wird auf Regelungsbetrieb (Block 39) übergegangen. Auf die weiteren Blöcke 41 und 42 wird später noch eingegangen werden.If this is the case, a statement is made below about whether there is idle or not (query 34). in case of an In idle mode, the following query 35 comes into play where it is determined whether a certain value X is from the characteristic curve 31 read threshold value X0LL has already reached or not. Corresponding a query 36 is provided in which, in the case of driving, d. H. Non-idle operation, the value X on reaching of the threshold value X0NLL is determined. Were the thresholds in one of the two queries 35 and 36 has not yet been reached the system is still in control mode (block 38), otherwise is switched to control mode (block 39). To the others Blocks 41 and 42 will be discussed later.

Im Rahmen einer vereinfachten Ausführungsform der Erfindung ist es auch möglich, lediglich einen lastunabhängigen Schwellwert anstelle der beiden Schwellwerte X0LL oder X0NLL zu verwenden. Es ist auch möglich, die vorgebbare Zeitdauer zusammen oder alternativ mit dem wenigstens einen Schwellwert einer die Betriebsdauer der Brennkraftmaschine charakterisierenden Größe als Einschaltkriterium für die Lambdaregelung zu benutzen. It is within the scope of a simplified embodiment of the invention also possible, just a load-independent threshold instead of the two threshold values X0LL or X0NLL. It is also possible, the predeterminable period of time together or alternatively with the at least one threshold of the operating time of the internal combustion engine characterizing variable as a switch-on criterion for the Lambda control to use.

Weiterhin ist es auch möglich, eine die Betriebstemperatur des Katalysators kennzeichnende Größe, die modellhaft aus Betriebsgrößen der Brennkraftmaschine berechnet werden kann, als Einschaltkriterium zu verwenden.Furthermore, it is also possible to adjust the operating temperature of the Catalyst characteristic size, which is modeled from company sizes the internal combustion engine can be calculated as a switch-on criterion to use.

Erläutert wird die Wirkungsweise des Flußdiagramms nach Figur 2 zweckmaßigerweise anhand der in Figur 3 dargestellten Signalverläufe. Dort ist über der Abszisse die Brennnkraftmaschinentemperatur zum Zeitpunkt des Starts aufgetragen (Starttemperatur, TMot-Start). Die Ordinate bilden Zeitdauer TV und ein Wert XO. In gestrichelter Linie sind Zeitdauerwerte in ihrem Verlauf angegeben. Ferner sind zwei Kurven mit ausgezogenen Linien eingetragen, wobei X0LL für einen Temperaturverlauf im Leerlauffall steht und X0NLL für einen Temperaturverlauf im Nicht-Leerlauffall.The mode of operation of the flow chart according to FIG. 2 is explained expediently on the basis of the signal curves shown in FIG. 3. The internal combustion engine temperature is there over the abscissa plotted at the time of the start (start temperature, TMot start). The ordinates form time period TV and a value XO. In dashed lines Line are given duration values in their course. Furthermore are two curves are drawn with solid lines, where X0LL for is a temperature curve when idling and X0NLL for one Temperature curve in the case of non-idling.

Es sei betont, daß die angegebenen Kurvenverläufe nur als Beispiel dienen und sich die Werte im speziellen System an zweckmäßigen Werten bei einem bestimmten Brennkraftmaschinentyp zu orientieren haben.It should be emphasized that the given curves are only an example serve and the values in the special system at appropriate values have to orientate themselves with a certain type of internal combustion engine.

Als wesentliche Aussage von Figur 3 bleibt festzuhalten, daß zu einzelnen Temperaturwerten zum Startzeitpunkt der Brennkraftmaschine (TMot-Start) unterschiedliche Brennkraftmaschinentemperaturen X0 für die Fälle Leerlauf (LL) und Nicht-Leerlauf (NLL) erreicht werden müssen, um die Lambda-Regelung zu aktivieren. Die Werte der beiden Kurven X0LL und X0NLL entstammen dabei den Kennlinien in Block 31 des Flußdiagrammes von Figur 2.As an essential statement of Figure 3 it should be noted that to individual Temperature values at the start time of the internal combustion engine (TMot-Start) different internal combustion engine temperatures X0 for the cases of idling (LL) and non-idling (NLL) can be achieved to activate the lambda control. The values of the two Curves X0LL and X0NLL originate from the characteristic curves in block 31 of the flow chart of Figure 2.

Entsprechend werden die aus Figur 3 ersichtlichen Zeitdauerwerte TV0 aus der Kennlinie 32 des Flußdiagramms von Figur 2 ausgelesen. Dabei ist ersichtlich, daß die vorgebbare Zeitdauer mit steigender Temperatur der Brennkraftmaschine zum Startzeitpunkt geringer gewählt wird. The time duration values TV0 shown in FIG. 3 correspondingly become read from the characteristic curve 32 of the flow chart of FIG. 2. It can be seen that the predeterminable time period increases with increasing Temperature of the internal combustion engine selected to be lower at the start time becomes.

Ein Blick auf Figur 2 verdeutlicht in Verbindung mit den Kurvenverläufen von Figur 3 die Wirkungsweise des erfindungsgemäßen Steuersystems.A look at Figure 2 illustrates in connection with the curves of Figure 3, the operation of the control system according to the invention.

Liegt Startfall vor, dann wird entsprechend Block 31 aus zwei Kennlinien der für eine bestimmte Starttemperatur geltende Wert für den Leerlauffall (X0LL) sowie der Wert für den Nicht-Leerlauffall (X0LL) ausgelesen. Anschließend erfolgt entsprechend Block 32 das Auslesen eines Wertes für eine Zeitdauer TVO, die ebenfalls von der Start-temperatur abhängig ist. Nach Ablauf dieser Zeitendauer erfolgt mit der Abfrage 34 eine Klärung der Frage, ob zum Zeitpunkt des entsprechenden Programmdurchlaufs Leerlauffall gegeben ist oder nicht.If there is a start, block 31 becomes two characteristic curves the value for the given start temperature Idle case (X0LL) and the value for the non-idle case (X0LL) read out. The readout then takes place in accordance with block 32 a value for a period of time TVO, which also depends on the start temperature is dependent. After this time has elapsed, Query 34 clarifies the question of whether at the time of the corresponding Program run idle case or not.

Liegt Leerlauf vor, doch ist ein Schwellwert XOLL noch nicht erfüllt, bleibt der Steuerungsbetrieb nach Block 38 erhalten. Entsprechend verhält es sich, wenn im Nicht-Leerlauffall ein Schwellwert XONLL noch nicht erreicht worden ist. Andernfalls wird auf Regelung mittels des Blocks 39 übergegangen.If there is idle, but a threshold value XOLL has not yet been met, The control operation after block 38 is retained. Corresponding it behaves when there is a threshold in the non-idle state XONLL has not yet been reached. Otherwise, the regulation by means of block 39.

Mit der Angabe X im Zusammenhang mit den Kennfeldwerten X0LL und X0NLL soll deutlich gemacht werden, daß für diese Werte unterschiedliche Größen einsetzbar sind. Als wesentlichste Größe ist hier die Temperatur zu nennen. Dies bedeutet, daß aus Block 31 über der Start-Temperatur Temperaturschwellwerte für den Leerlauffall und den Nicht-Leerlauffall auslesbar sind und in den Abfragen 35 und 36 ermittelt wird, der momentane Temperaturmeßwert die beiden Schwellwerte für den Leerlaufbetrieb und den Nicht-Leerlaufbetrieb bereits erreicht hat. Erst beim Überschreiten dieser Schwellwerte im Leerlauf- bzw. Nicht-Leerlauffall wird von Steuerung auf Regelung übergegangen. With the specification X in connection with the map values X0LL and X0NLL should be made clear that different values exist for these values Sizes can be used. The most important size here is Temperature. This means that from block 31 above the Start temperature Temperature threshold values for idling and Non-idle case are readable and determined in queries 35 and 36 the current temperature measured value the two threshold values already reached for the idle mode and the non-idle mode Has. Only when these threshold values are exceeded in idle or non-idling case is switched from control to regulation.

Als weitere zu messende Größe statt Tmot kann ein Signal dienen, das mittelbar
oder unmittelbar den Energieumsatz in der Brennkraftmaschine seit dem Start wiedergibt. Dies bedeutet, daß mittelbar oder unmittelbar wenigstens eine der folgenden Größen erfaßt werden kann:

  • Anzahl der seit dem Start erfolgten Zündungen,
  • Summe der seit Start angesaugten Luftmasse, bzw. Luftmasse,
  • Summe der seit Start zugeführten Kraftstoffmasse, insbesondere Summe der ausgegebenen Einspritzzeiten,
  • Integral über dem Drosselklappenwinkel, was ebenfalls einem summierten Lastsignal entspricht.
  • die Katalysatortemperatur, die bspw. aus Betriebskenngrößen der Brennkraftmaschine modellhaft berechnet werden kann. Auch mit Hilfe der Abgastemperatur, die bspw. mit Hilfe des Abgastemperatursensors 25 gemessen oder in bekannter Weise aus dem Innenwiderstand der Lambdasonde 18 ableitbar ist, kann modellhaft auf die Katalysatortemperatur und damit auf die Betriebsbereitschaft des Katalysators geschlossen werden.
A signal that is indirect can serve as a further variable to be measured instead of Tmot
or immediately represents the energy turnover in the internal combustion engine since the start. This means that at least one of the following variables can be recorded directly or indirectly:
  • Number of ignitions since start,
  • Sum of the air mass sucked in since the start, or air mass,
  • Sum of the fuel mass supplied since the start, in particular sum of the injection times issued,
  • Integral over the throttle valve angle, which also corresponds to a summed load signal.
  • the catalyst temperature, which can be calculated, for example, from operating parameters of the internal combustion engine. With the help of the exhaust gas temperature, which is measured, for example, with the aid of the exhaust gas temperature sensor 25 or can be derived in a known manner from the internal resistance of the lambda probe 18, the catalytic converter temperature and thus the operational readiness of the catalytic converter can be inferred as a model.

Block 41 von Figur 2 verdeutlicht verschiedene zweckmäßige Maßnahmen während des Steuerbetriebes (Block 38). So hat sich als besonders zweckmäßig herausgestellt, den Leerlaufdrehzahlsollwert in der Warmlaufphase um ein bestimmtes Delta zu erhöhen, ferner - jeweils alternativ oder ergänzend - die Wiedereinsetzdrehzahl zur Freigabe der Kraftstoffzufuhr nach der Kraftstoffabschaltung im Schiebebetrieb anzuheben bzw. die Zündung nach spät zu verstellen.Block 41 of FIG. 2 illustrates various appropriate measures during control operation (block 38). So has turned out to be special expediently highlighted the idle speed setpoint in the warm-up phase to increase a certain delta, further - alternatively or in addition - the reinsertion speed to release the Fuel supply after fuel cut-off in push mode to raise or adjust the ignition late.

Block 42 im Flußdiagramm nach Figur 2 verdeutlich die Möglichkeit, beim Einschalten des Regelungsbetriebs oder während der Verzögerung seiner Wirksamkeit einen Warmlaufanreicherungsfaktor WL zeitund/oder zündungsabhängig über eine Rampe abzuregeln bzw. alternativ oder ergänzend im Falle der Möglichkeit einer Sekundärluftzugabe diese Sekundärluftzugabe zuerst abzuschalten und erst anschließend mit wählbarer Verzögerung die Regelung in Block 39 zur Wirkung kommen zu lassen.Block 42 in the flow chart according to FIG. 2 illustrates the possibility of when the control mode is switched on or during the delay its effectiveness a warm-up enrichment factor WL time and / or dependent on the ignition via a ramp or alternatively or additionally in the case of the possibility of adding secondary air, this First switch off the secondary air supply and only then with selectable delay the regulation in block 39 come into effect to let.

Claims (5)

  1. Control system of an internal combustion engine for metering fuel as a function of characteristic operating variables such as load, rotational speed and temperature, having means for regulating the metering of fuel as a function of the output signal of a probe located in the exhaust gas manifold of the internal combustion engine and having means for switching over between open-loop and closed-loop control mode as a function of a characteristic operating variable which is set to the start time as a function of the temperature of the internal combustion engine, characterized in that the characteristic operating variable is a time period, and/or in that the characteristic operating variable is a threshold value for at least one of the following variables:
    the number of ignitions which have taken place since the start,
    the sum of the mass air flow rate or a volume air flow rate sucked in since the start,
    the sum of the fuel mass fed in since the start, in particular the sum of the injection times which have been output,
    the integral of the throttle-valve angle,
    the integral of the intake manifold pressure,
    the value of the exhaust gas temperature,
    the value of the temperature of the catalytic converter.
  2. Control system according to Claim 1, characterized in that up to the time when the closed-loop control mode is switched on, at least one of the following measures is taken:
    the reference idling speed is increased,
    the resumption speed for the enabling of the fuel supply after the fuel is switched off under overrun conditions is increased,
    the ignition is adjusted in the late direction.
  3. Control system according to at least one of Claims 1 - 2, characterized in that in conjunction with the transition to closed-loop control mode, at least one of the following measures comes into effect:
    the warming-up enrichment factor is reduced over a ramp as a function of time and/or ignition,
    the start of closed-loop control is delayed until the secondary air supply is switched off.
  4. Control system according to at least one of Claims 1 - 3, characterized in that the prescribable time period is selected to be smaller as the temperature of the internal combustion engine rises up to the start time.
  5. Control system according to at least one of Claims 1 - 4, characterized in that different threshold values at least for two different load states are selected for the variable characterizing the operating period of the internal combustion engine, and in that, in addition, the system is switched over from open-loop control to closed-loop control if the characterizing variable in the load state at that time has reached the load-dependent threshold value and/or the prescribable time period has expired.
EP94907495A 1993-03-19 1994-02-19 Control system for metering the fuel supply to an internal combustion engine Expired - Lifetime EP0641414B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4308813 1993-03-19
DE4308813A DE4308813A1 (en) 1993-03-19 1993-03-19 Control system for the fuel metering of an internal combustion engine
PCT/DE1994/000175 WO1994021909A1 (en) 1993-03-19 1994-02-19 Control system for metering the fuel supply to an internal combustion engine

Publications (2)

Publication Number Publication Date
EP0641414A1 EP0641414A1 (en) 1995-03-08
EP0641414B1 true EP0641414B1 (en) 1998-06-03

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EP94907495A Expired - Lifetime EP0641414B1 (en) 1993-03-19 1994-02-19 Control system for metering the fuel supply to an internal combustion engine

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US (1) US5533491A (en)
EP (1) EP0641414B1 (en)
JP (1) JP3466192B2 (en)
DE (2) DE4308813A1 (en)
WO (1) WO1994021909A1 (en)

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Publication number Priority date Publication date Assignee Title
DE4435419A1 (en) * 1994-10-04 1996-04-11 Bosch Gmbh Robert Control system for the fuel metering of an internal combustion engine
DE19545418C2 (en) * 1995-12-06 1997-09-18 Bosch Gmbh Robert Electronic control device for metering fuel in an internal combustion engine
TW340067B (en) * 1996-11-13 1998-09-11 Ishikawajima Harima Heavy Ind Rolled strip joining device and a hot strip mill having such a device
DE19728926C1 (en) * 1997-07-07 1999-01-21 Bosch Gmbh Robert Method of lambda-controlled after-start delay in an internal combustion engine with lambda control
FR2765914B1 (en) * 1997-07-08 1999-09-03 Renault METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE
US6226981B1 (en) 1999-02-02 2001-05-08 Caterpillar Inc. Air to fuel ratio control for gas engine and method of operation
DE10101006A1 (en) * 2001-01-11 2002-07-18 Volkswagen Ag Controlling quantity of fuel delivered during starting of internal combustion engine comprises increasing quantity of fuel delivered by starting quantity increasing factor
JP4321647B2 (en) * 2007-09-21 2009-08-26 トヨタ自動車株式会社 Internal combustion engine abnormal output limit device

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US3918257A (en) * 1970-12-30 1975-11-11 Toyo Kogyo Co Exhaust gas purifying device for an internal combustion engine
DE2522283C3 (en) * 1975-05-20 1981-02-19 Robert Bosch Gmbh, 7000 Stuttgart Device for starting and / or post-starting enrichment of the fuel-air mixture fed to an internal combustion engine and formed by means of an electric fuel injection system
DE2805805C2 (en) * 1978-02-11 1989-07-20 Robert Bosch Gmbh, 7000 Stuttgart Method and device for operating a fuel supply system with lambda control
DE3024606A1 (en) * 1980-06-28 1982-01-28 Robert Bosch Gmbh, 7000 Stuttgart CONTROL DEVICE FOR THE COMPOSITION OF THE OPERATING MIXTURE COMING INTO AN INTERNAL COMBUSTION ENGINE
JPS5827844A (en) * 1981-08-13 1983-02-18 Toyota Motor Corp Method and device for controlling fuel supply for internal combustion engine
JPS5872628A (en) * 1981-10-26 1983-04-30 Toyota Motor Corp Feedback control method of air-fuel ratio in electronically controlled engine
JPS59196932A (en) * 1983-04-25 1984-11-08 Nissan Motor Co Ltd Air-fuel ratio controlling apparatus for internal-combustion engine
JPS60259743A (en) * 1984-06-05 1985-12-21 Honda Motor Co Ltd Idling control for internal-combustion engine
JPS6456953A (en) * 1987-08-25 1989-03-03 Fuji Heavy Ind Ltd Trouble diagnosing device for exhaust gas recirculation device
JPH01280651A (en) * 1988-04-30 1989-11-10 Suzuki Motor Co Ltd Air-fuel ratio control device
DE3929746A1 (en) * 1989-09-07 1991-03-14 Bosch Gmbh Robert METHOD AND DEVICE FOR CONTROLLING AND REGULATING A SELF-IGNITIONING INTERNAL COMBUSTION ENGINE

Also Published As

Publication number Publication date
DE4308813A1 (en) 1994-09-22
DE59406118D1 (en) 1998-07-09
US5533491A (en) 1996-07-09
JPH07506886A (en) 1995-07-27
JP3466192B2 (en) 2003-11-10
WO1994021909A1 (en) 1994-09-29
EP0641414A1 (en) 1995-03-08

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