EP0771942A1 - Apparatus for the electronic control of an engine for motor vehicles with an injection valve - Google Patents

Apparatus for the electronic control of an engine for motor vehicles with an injection valve Download PDF

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Publication number
EP0771942A1
EP0771942A1 EP96114533A EP96114533A EP0771942A1 EP 0771942 A1 EP0771942 A1 EP 0771942A1 EP 96114533 A EP96114533 A EP 96114533A EP 96114533 A EP96114533 A EP 96114533A EP 0771942 A1 EP0771942 A1 EP 0771942A1
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EP
European Patent Office
Prior art keywords
electronic control
injection valve
injection
fuel quantity
stored
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96114533A
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German (de)
French (fr)
Inventor
Ulrich Munz
Wolfgang Fuchs
Erich Eichlinger
Bernhard Lechner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0771942A1 publication Critical patent/EP0771942A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2432—Methods of calibration

Definitions

  • the invention relates to a device for electronic control of the internal combustion engine in motor vehicles with an injection valve according to the preamble of claim 1.
  • the injection time assigned to the predetermined fuel quantity is stored in the form of a valve-adaptive characteristic curve for controlling the injection valve in the electronic control unit.
  • a characteristic curve that takes into account the non-linearity of an injection valve is stored in the electronic control unit with several support points.
  • the invention can also be expanded to a map in which operating parameters, such as. B. the battery voltage or the intake temperature are also taken into account.
  • the characteristic curve is stored in a reprogrammable data memory of the electronic control unit.
  • electronic control devices which differentiate between data and program memories.
  • the data memories of these control devices are usually only written to at the end of the line when all the components of the associated motor vehicle are fixed.
  • the injection valves could also be defined as components on which the programming of the data storage at the end of the line or in the workshop depends. This further development according to the invention not only facilitates handling at the end of the belt, but also enables the electronic control to be optimally adapted when replacing injection valves in the workshop.
  • the injection time t i is plotted on the abscissa and the fuel quantity V on the ordinate.
  • the dashed line C represents a linear assignment of the injection time t i to a predetermined fuel quantity V in the form of a multiplicative constant according to the prior art.
  • the injection time t i is, for example, the absolute time period within which the injection valve is opened for injecting fuel. This injection time t i can be specified, for example, by a pulse duty factor of a pulse-width-modulated control signal of the injection valve.
  • a characteristic curve K can, for example, for different Injector types are determined empirically and stored in the electronic control unit in accordance with the injection valves installed in the motor vehicle.
  • a characteristic curve can be used for the starting process of the internal combustion engine, which is continued in accordance with the dashed curve (the bold line) shown in the drawing by the extrapolation of the last two support points.
  • a mathematical algorithm is sufficient for this, further support points do not have to be saved.
  • the characteristic curve K is preferably stored in connection with the map programming at the end of the line.
  • the characteristic curve K is stored in a data memory which can be reprogrammed in the workshop, for example. This means that when using new injection valve types, the fuel quantity control can be optimally adjusted. Characteristic curve K compensates for the non-linearities caused by the component tolerances in the injection valve. A more precise fuel quantity injection is thus possible.
  • the device according to the invention is a further contribution to reducing the exhaust gas emissions.

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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 device controls an injection valve for injecting a predetermined fuel quantity into the combustion engine by adjusting an injection time corresponding to this fuel quantity. The injection time (ti) associated with the predetermined fuel quantity (V) is stored in the electronic control in form of a graph (K), adapted to the injection valve. The graph is pref. stored in re-programmable data memories, and additional parameter, such as battery level or in-take temperature, may also be considered for the adaptation of the graph.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur elektronischen Steuerung der Brennkraftmaschine in Kraftfahrzeugen mit einem Einspritzventil nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for electronic control of the internal combustion engine in motor vehicles with an injection valve according to the preamble of claim 1.

Es sind bereits Vorrichtungen zur elektronischen Steuerung der Brennkraffmaschine in Kraftfahrzeugen bekannt, durch die ein Einspritzventil mit einer einer vorgegebenen Kraftstoffmenge zugeordneten Einspritzzeit angesteuert wird. Bei derartigen bekannten Steuerungen ist die Zuordnung zwischen Einspritzzeit und Kraftstoffmenge in Form einer im elektronischen Steuergerät abgespeicherten Konstante lediglich als lineare Kennlinie festgelegt. Die Einspritzzeit entspricht der Zeit, innerhalb der das Einspritzventil zur Freigabe von Kraftstoff geöffnet wird. Bei einer linearen Zuordnung zwischen Kraftstoffmenge und Einspritzzeit treten jedoch Abweichungen zwischen der vorgegebenen Kraftstoffmenge und der tatsächlich eingespritzten Kraftstoffmenge auf, da das bauteilbedingte Verhältnis zwischen Kraftstoffmenge und Einspritzzeit aufgrund von Toleranzen bei der konstruktiven Ausgestaltung von Einspritzventilen nicht linear ist.Devices for electronically controlling the internal combustion engine in motor vehicles are already known, by means of which an injection valve is actuated with an injection time assigned to a predetermined fuel quantity. In such known controls, the association between injection time and fuel quantity in the form of a constant stored in the electronic control unit is only defined as a linear characteristic. The injection time corresponds to the time within which the injection valve is opened to release fuel. In the case of a linear association between the amount of fuel and the injection time, however, deviations occur between the predetermined amount of fuel and the amount of fuel actually injected, since the component-related relationship between amount of fuel and Injection time is not linear due to tolerances in the design of injection valves.

Es ist Aufgabe der Erfindung, eine Vorrichtung eingangs genannter Art derart zu verbessern, daß Bauteilfehler oder Bauteiltoleranzen von Einspritzventilen kompensiert werden.It is an object of the invention to improve a device of the type mentioned at the outset in such a way that component errors or component tolerances of injection valves are compensated for.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.
Erfindungsgemäß ist zur Ansteuerung des Einspritzventiles im elektronischen Steuergerät die der vorgegebenen Kraftstoffmenge zugeordnete Einspritzzeit in Form einer ventiladaptiven Kennlinie abgelegt.
Anstelle einer multiplikativen Konstante für die lineare Zuordnung einer Einspritzzeit zu einer vorgegebenen Kraftstoffmenge wird eine die Nichtlinearität eines Einspritzventils berücksichtigende Kennlinie mit mehreren Stützstellen im elektronischen Steuergerät abgespeichert. Die Erfindung kann bei Bedarf auch zu einem Kennfeld erweitert werden, bei dem Betriebsparameter, wie z. B. die Batteriespannung oder die Ansaugtemperatur, mitberücksichtigt werden.
Durch die erfindungsgemäße Verbesserung der Kraftstoffmengeneinspritzung kann die Abweichung zwischen tatsächlich eingespritzter und vorgegebener Kraftstoffmenge minimiert werden, wodurch insbesondere auch eine Reduzierung der Abgasemissionen erreicht wird.This object is achieved by the characterizing features of patent claim 1.
According to the invention, the injection time assigned to the predetermined fuel quantity is stored in the form of a valve-adaptive characteristic curve for controlling the injection valve in the electronic control unit.
Instead of a multiplicative constant for the linear assignment of an injection time to a predetermined fuel quantity, a characteristic curve that takes into account the non-linearity of an injection valve is stored in the electronic control unit with several support points. If necessary, the invention can also be expanded to a map in which operating parameters, such as. B. the battery voltage or the intake temperature are also taken into account.
The improvement in the fuel quantity injection according to the invention enables the deviation between the actually injected and the predetermined fuel quantity to be minimized, as a result of which in particular a reduction in the exhaust gas emissions is also achieved.

Eine vorteilhafte Ausgestaltung der Erfindung ist der Gegenstand des Patentanspruchs 2.
Erfindungsgemäß ist die Kennlinie in einem umprogrammierbaren Datenspeicher des elektronischen Steuergeräts abgelegt.An advantageous embodiment of the invention is the subject of claim 2.
According to the invention, the characteristic curve is stored in a reprogrammable data memory of the electronic control unit.

Es sind beispielsweise elektronische Steuergeräte bekannt, die zwischen Daten- und Programmspeichern unterscheiden. Die Datenspeicher dieser Steuergeräte werden üblicherweise erst am Bandende beschrieben, wenn sämtliche Komponenten des zugehörigen Kraftfahrzeuges feststehen. Auch könnten die Einspritzventile als Komponenten definiert werden, von denen die Programmierung der Datenspeicher am Bandende oder in der Werkstatt abhängen. Diese erfindungsgemäße Weiterbildung erleichtert nicht nur die Handhabung am Bandende, sondern ermöglicht auch eine optimale Anpassung der elektronischen Steuerung bei einem Austausch von Einspritzventilen in der Werkstatt.For example, electronic control devices are known which differentiate between data and program memories. The data memories of these control devices are usually only written to at the end of the line when all the components of the associated motor vehicle are fixed. The injection valves could also be defined as components on which the programming of the data storage at the end of the line or in the workshop depends. This further development according to the invention not only facilitates handling at the end of the belt, but also enables the electronic control to be optimally adapted when replacing injection valves in the workshop.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Sie zeigt eine erfindungsgemäße Kennlinie im Vergleich mit dem Stand der Technik.In the drawing, an embodiment of the invention is shown. It shows a characteristic curve according to the invention in comparison with the prior art.

In der Figur ist auf der Abszisse die Einspritzzeit ti und auf der Ordinate die Kraftstoffmenge V aufgetragen. Durch die gestrichelte Gerade C ist eine lineare Zuordnung der Einspritzzeit ti zu einer vorgegebenen Kraftstoffmenge V in Form einer multiplikativen Konstante nach dem Stand der Technik dargestellt. Die Einspritzzeit ti ist beispielsweise die absolute Zeitdauer, innerhalb der das Einspritzventil zum Einspritzen von Kraftstoff geöffnet wird. Diese Einspritzzeit ti kann beispielsweise durch ein Tastverhältnis eines pulsweitenmodulierten Ansteuersignals des Einspritzventils vorgegeben werden.In the figure, the injection time t i is plotted on the abscissa and the fuel quantity V on the ordinate. The dashed line C represents a linear assignment of the injection time t i to a predetermined fuel quantity V in the form of a multiplicative constant according to the prior art. The injection time t i is, for example, the absolute time period within which the injection valve is opened for injecting fuel. This injection time t i can be specified, for example, by a pulse duty factor of a pulse-width-modulated control signal of the injection valve.

Erfindungsgemäß wird für die Zuordnung der Einspritzzeit ti zu einer vorgegebenen Kraftstoffmenge V nicht eine lineare Kennlinie entsprechend der Geraden C sondern die nichtlineare Kennlinie K mit mehreren Stützstellen (Punkte) verwendet. Eine Kennlinie K kann beispielsweise für verschiedene Einspritzventil-Typen empirisch ermittelt und entsprechend den im Kraftfahrzeug verbauten Einspritzventilen im elektronischen Steuergerät abgespeichert werden.According to the invention, not a linear characteristic curve corresponding to the straight line C but the non-linear characteristic curve K with a plurality of support points (points) is used for assigning the injection time t i to a predetermined fuel quantity V. A characteristic curve K can, for example, for different Injector types are determined empirically and stored in the electronic control unit in accordance with the injection valves installed in the motor vehicle.

Optional kann für den Startvorgang der Brennkraftmaschine eine Kennlinie verwendet werden, die entsprechend dem in der Zeichnung dargestellten gestrichelten Verlauf (der fetten Linie) durch die Extrapolation der letzten beiden Stützstellen weitergeführt ist. Hierzu reicht ein mathematischer Algorithmus aus, weitere Stützstellen müssen nicht abgespeichert werden.Optionally, a characteristic curve can be used for the starting process of the internal combustion engine, which is continued in accordance with the dashed curve (the bold line) shown in the drawing by the extrapolation of the last two support points. A mathematical algorithm is sufficient for this, further support points do not have to be saved.

Die Speicherung der Kennlinie K findet vorzugsweise im Zusammenhang mit der Kennfeldprogrammierung am Bandende statt. Die Kennlinie K wird in einem Datenspeicher abgelegt, der beispielsweise in der Werkstatt umprogammierbar ist. Somit kann bei Verwendung neuer Einspritzventil-Typen eine optimale Anpassung der Kraftstoffmengensteuerung vorgenommen werden. Durch die Kennlinie K werden die durch die Bauteiltoleranzen im Einspritzventil verursachten Nichtlinaritäten kompensiert. Somit ist eine genauere Kraftstoffmengeneinspritzung möglich. Die erfindungsgemäße Vorrichtung ist ein weiterer Beitrag zur Reduzierung der Abgasemissionen.The characteristic curve K is preferably stored in connection with the map programming at the end of the line. The characteristic curve K is stored in a data memory which can be reprogrammed in the workshop, for example. This means that when using new injection valve types, the fuel quantity control can be optimally adjusted. Characteristic curve K compensates for the non-linearities caused by the component tolerances in the injection valve. A more precise fuel quantity injection is thus possible. The device according to the invention is a further contribution to reducing the exhaust gas emissions.

Claims (2)

Vorrichtung zur elektronischen Steuerung der Brennkraftmaschine in Kraftfahrzeugen mit einem Einspritzventil, das zum Einspritzen einer vorgegebenen Kraftstoffmenge durch ein elektronisches Steuergerät mit einer dieser Kraftstoffmenge zugeordneten Einspritzzeit angesteuert wird, dadurch gekennzeichnet, daß zur Ansteuerung des Einspritzventils im elektronischen Steuergerät die der vorgegebenen Kraftstoffmenge (V) zugeordnete Einspritzzeit (ti) in Form einer ventiladaptiven Kennlinie (K) abgelegt ist.Device for the electronic control of the internal combustion engine in motor vehicles with an injection valve, which is controlled by an electronic control unit with an injection time assigned to this quantity of fuel for injecting a predetermined quantity of fuel, characterized in that, in order to control the injection valve in the electronic control unit, the quantity assigned to the specified fuel quantity (V) Injection time (t i ) is stored in the form of a valve-adaptive characteristic (K). Vorrichtung nach Patentanspruch 1, dadurch gekennzeichnet, daß die Kennlinie (K) in einem umprogrammierbaren Datenspeicher des elektronischen Steuergeräts abgelegt ist.Device according to claim 1, characterized in that the characteristic curve (K) is stored in a reprogrammable data memory of the electronic control unit.
EP96114533A 1995-10-30 1996-09-11 Apparatus for the electronic control of an engine for motor vehicles with an injection valve Withdrawn EP0771942A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995140416 DE19540416A1 (en) 1995-10-30 1995-10-30 Device for the electronic control of the internal combustion engine in motor vehicles with an injection valve
DE19540416 1995-10-30

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EP0771942A1 true EP0771942A1 (en) 1997-05-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1691067A3 (en) * 2005-02-14 2006-10-04 Hitachi, Ltd. Electromagnetic actuator, fuel injection valve and method of driving the same
WO2011051783A1 (en) * 2009-10-28 2011-05-05 Eaton Corporation Method to characterize and control the flow rate of a pulse width modulating fuel injector
EP2336534A1 (en) * 2009-12-18 2011-06-22 Delphi Technologies, Inc. Method and system for the injector-individual adaptation of the injection time of motor vehicles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3871375B2 (en) * 1996-06-19 2007-01-24 株式会社日本自動車部品総合研究所 Fuel injection device for internal combustion engine
JP4061982B2 (en) 2002-06-19 2008-03-19 株式会社デンソー Fuel injection system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072025A2 (en) * 1981-08-10 1983-02-16 Mitsubishi Denki Kabushiki Kaisha An internal combustion engine and a fuel injection control system for an internal combustion engine
GB2118325A (en) * 1982-04-03 1983-10-26 Lucas Ind Plc Fuel supply system for an internal combustion engine
US4790277A (en) * 1987-06-03 1988-12-13 Ford Motor Company Self-adjusting fuel injection system
FR2688547A1 (en) * 1992-03-13 1993-09-17 Bosch Gmbh Robert System for controlling an internal combustion engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3224742A1 (en) * 1982-07-02 1984-01-05 Robert Bosch Gmbh, 7000 Stuttgart METHOD AND DEVICE FOR DETERMINING THE INJECTED FUEL AMOUNT IN INTERNAL COMBUSTION ENGINES
DE3403395A1 (en) * 1984-02-01 1985-08-08 Robert Bosch Gmbh, 7000 Stuttgart FUEL-AIR MIXING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
DE3730443A1 (en) * 1987-09-10 1989-03-23 Voest Alpine Automotive METHOD FOR CONTROLLING AND REGULATING AN INTERNAL COMBUSTION ENGINE AND ELECTRONIC FUEL INJECTION DEVICE FOR CARRYING OUT THE METHOD

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072025A2 (en) * 1981-08-10 1983-02-16 Mitsubishi Denki Kabushiki Kaisha An internal combustion engine and a fuel injection control system for an internal combustion engine
GB2118325A (en) * 1982-04-03 1983-10-26 Lucas Ind Plc Fuel supply system for an internal combustion engine
US4790277A (en) * 1987-06-03 1988-12-13 Ford Motor Company Self-adjusting fuel injection system
FR2688547A1 (en) * 1992-03-13 1993-09-17 Bosch Gmbh Robert System for controlling an internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1691067A3 (en) * 2005-02-14 2006-10-04 Hitachi, Ltd. Electromagnetic actuator, fuel injection valve and method of driving the same
US7357123B2 (en) 2005-02-14 2008-04-15 Hitachi, Ltd. Electromagnetic actuator, fuel injection valve, method of controlling fuel injection valve, and method of driving the same
WO2011051783A1 (en) * 2009-10-28 2011-05-05 Eaton Corporation Method to characterize and control the flow rate of a pulse width modulating fuel injector
EP2336534A1 (en) * 2009-12-18 2011-06-22 Delphi Technologies, Inc. Method and system for the injector-individual adaptation of the injection time of motor vehicles
WO2011073147A1 (en) * 2009-12-18 2011-06-23 Delphi Technologies, Inc. Method and system for installation of fuel injectors specific parameters

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Publication number Publication date
DE19540416A1 (en) 1997-05-07

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