EP0229793A1 - Method for operating an internal combustion engine. - Google Patents

Method for operating an internal combustion engine.

Info

Publication number
EP0229793A1
EP0229793A1 EP86904141A EP86904141A EP0229793A1 EP 0229793 A1 EP0229793 A1 EP 0229793A1 EP 86904141 A EP86904141 A EP 86904141A EP 86904141 A EP86904141 A EP 86904141A EP 0229793 A1 EP0229793 A1 EP 0229793A1
Authority
EP
European Patent Office
Prior art keywords
time
gas exchange
coil
computer
exchange valve
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.)
Granted
Application number
EP86904141A
Other languages
German (de)
French (fr)
Other versions
EP0229793B1 (en
Inventor
Andreas Fleck
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.)
CESSIONE;AUDI AG
Original Assignee
Andreas Fleck
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 Andreas Fleck filed Critical Andreas Fleck
Publication of EP0229793A1 publication Critical patent/EP0229793A1/en
Application granted granted Critical
Publication of EP0229793B1 publication Critical patent/EP0229793B1/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means

Definitions

  • the invention relates to a method for operating an internal combustion engine according to the preamble of claim 1.
  • Such an internal combustion engine is in DE-OS 302. 109 disclosed.
  • the object of the invention is to provide a method with which a generic internal combustion engine can be operated with the highest possible efficiency.
  • crankshaft angle-controlled system is characterized by good accuracy; it is superior to the time-controlled ignition systems which are simpler in structure.
  • the timed Systems determine the respective crankshaft angle position based on a time base and the speed.
  • crankshaft angle-controlled system When transferring a crankshaft angle-controlled system to the arrangement for controlling the gas exchange valves in an internal combustion engine of the generic type, however, it turns out that the accuracy inherent in the crankshaft angle-controlled system is not readily usable for compliance with the opening and closing times of the gas exchange valves.
  • crankshaft angle information is evaluated at the same time in order to determine speed changes.
  • the figure shows the time course of the current flowing through the coil, in particular during the time of the change of position of the gas exchange valve.
  • the gas exchange valve As long as the gas exchange valve remains in its one rest position, the open or closed position, the armature of the gas exchange valve is in the vicinity of a coil through which current flows, the current flow through this coil exerting holding force on the armature of the gas exchange valve. If the current flow through the coil is switched off, the holding force breaks down.
  • a spring system acts on the gas exchange valve and accelerates it towards the other rest position. As described in DE-OS 3024 109, the central position of this spring system is between the two rest positions, so that the spring system acts on the gas exchange valve in such a way that it is moved beyond its rest position to approximately the other working position.
  • the coil assigned to the other working position is excited so that the armature, when it comes into the vicinity of the coil core, is caught by the latter and is held in its other working position by the current flow through the coil.
  • coil 1 represents the current profile in the coil which is responsible for the closed position of the gas exchange valve. If the gas exchange valve is to open, the current through the coil 1 is switched off at time t, so that the armature is pressed into the open position of the gas exchange valve by the spring force.
  • the computer Since the computer calculated the time t beforehand, the computer knows at the same time when the armature of the gas exchange valve will hit the pole faces of the coil core, which serves to hold the gas exchange valve in the open position. In order to have built up a sufficiently high current when the armature strikes the pole faces, which ensures sufficient force to catch the armature, the current in the coil 2 is switched on in good time beforehand at a time t Q. At time t 2 , the armature hits the pole face of coil 2, which is in the course of the current
  • the computer is now switched over to a time base in order to, starting at time t. , at a point in time t ,, which is somewhat later than the expected impact time, to switch off the capture current in coil 2, so that the current running through the coil 2 gradually decreases again due to a freewheeling circuit, in order to subsequently switch into a clocked one Hold phase to go.
  • the period between t 1 and t is a certain safety space in order to guarantee that the gas exchange valve has actually been caught by the coil 2 and that the gas exchange valve is accordingly kept in its full open position.

Abstract

Dans le procédé ci-décrit, les soupapes à deux voies de gaz sont maintenues en position d'ouverture ou de fermeture par l'injection de courant provenant d'électro-aimants. Ces derniers sont commandés par l'intermédiaire d'un ordinateur, lequel est piloté en fonction de l'angle du vilebrequin et est cependant commuté sur une temporisation pendant la phase de marche de la soupape.In the method described above, the two-way gas valves are maintained in the open or closed position by the injection of current from electromagnets. These are controlled by means of a computer, which is controlled as a function of the angle of the crankshaft and is however switched to a time delay during the operating phase of the valve.

Description

Verfahren zum Betreiben einer Brennkraftmaschine Method for operating an internal combustion engine
Die Erfindung betrifft ein Verfahren zum Betreiben einer Brennkraft¬ maschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for operating an internal combustion engine according to the preamble of claim 1.
Eine derartige Brennkraftmaschine ist in der DE-OS 302 . 109 offen¬ bart.Such an internal combustion engine is in DE-OS 302. 109 disclosed.
Zur Funktionsfähigkeit und Optimierung einer derartigen Brennkraft¬ maschine ist es notwendig, die 'Offnungs- und SchlieΘzeitpunkte der Gaswechselventile möglichst genau festzulegen und einzuhalten.To the functioning and optimization of such Brennkraft¬ machine it is necessary to closely as possible to set and adhere to the 'opening and SchlieΘzeitpunkte the gas exchange valves.
Aufgabe der Erfindung ist es, ein Verfahren anzugeben, mit dem ei¬ ne gattungsgemäße Brennkraftmaschine mit möglichst hohem Wirkungs¬ grad betrieben werden kann.The object of the invention is to provide a method with which a generic internal combustion engine can be operated with the highest possible efficiency.
Die Aufgabe wird gelöst durch die Maßnahmen nach Anspruch 1.The object is achieved by the measures according to claim 1.
Es sind Berechnungen von Zündzeitpunkten bekannt, bei denen mit Hilfe von Signalen, die an einem mit der Kurbelwelle synchron dre¬ henden Bauteil abgenommen werden, Referenzimpulse zum Takten der Schaltung erzeugt werden. Da somit im Rechnersystem zu jedem Zeit¬ punkt die Information über die Stellung der Kurbelwelle vorliegt, kann auf die Drehzahlinformation zum Festlegen des Zeitpunktes ver¬ zichtet werden. Unberührt davon kann natürlich die Drehzahl als Parameter in den Berechnungsabläufen Eingang finden.Calculations of ignition times are known, in which reference pulses for clocking the circuit are generated with the aid of signals which are taken from a component which rotates synchronously with the crankshaft. Since the information about the position of the crankshaft is thus available at all times in the computer system, the speed information for determining the time can be dispensed with. Unaffected by this, the speed can of course be used as a parameter in the calculation processes.
Ein derartiges kurbelwellenwinkelgesteuertes System zeichnet sich durch eine gute Genauigkeit aus, es ist den vom Aufbau her einfa¬ cheren zeitgesteuerten Zündsystemen überlegen. Die zeitgesteuerten Systeme ermitteln aufgrund einer Zeitbasis und der Drehzahl die jeweilige Kurbelwellenwinkelstellung.Such a crankshaft angle-controlled system is characterized by good accuracy; it is superior to the time-controlled ignition systems which are simpler in structure. The timed Systems determine the respective crankshaft angle position based on a time base and the speed.
Bei der Übertragung eines kurbelwellenwinkelgesteuerten Systems auf die Anordnung zur Ansteuerung der Gaswechselventile bei einer gattungsgemäßen Brennkraftmaschine stellt sich jedoch heraus, daß die den kurbelwellenwinkelgesteuerten) System innewohnende Genauig¬ keit nicht ohne weiteres für die Einhaltung der Offnungs- und Schlie߬ zeitpunkte der Gaswechselventile nutzbar ist.When transferring a crankshaft angle-controlled system to the arrangement for controlling the gas exchange valves in an internal combustion engine of the generic type, however, it turns out that the accuracy inherent in the crankshaft angle-controlled system is not readily usable for compliance with the opening and closing times of the gas exchange valves.
Zur Überwindung dieser Schwierigkeiten wird vorgesehen, daß in be¬ stimmten Betriebszuständen der gattungsgemäßen Brennkraftmaschine umgeschaltet wird von einem kUrbelwellenwinkelbezogenen System zur Festlegung von O'ffnungs- und Schließzeitpunkten für die Gaswech¬ selventile auf ein zeitbasisbezogenes.To overcome these difficulties in that be¬ certain operating states of the generic internal combustion engine is switched from a crankshaft angle-related system establishing O 'opening and closing, time points for the gas exchange selventile on a time basis related is provided.
In einer bevorzugten Ausführung der Erfindung ist vorgesehen, daß während der Intervalle, während denen der Rechner über die Zeit- baεis gesteuert wird, gleichzeitig die Kurbelwellenwinkelinforma- tion ausgewertet wird, um Drehzahl nderungen zu ermitteln.In a preferred embodiment of the invention, it is provided that during the intervals during which the computer is controlled via the time base, the crankshaft angle information is evaluated at the same time in order to determine speed changes.
Im folgenden wird das erfindungsgemäße Verfahren anhand der Figur beschrieben.The method according to the invention is described below with reference to the figure.
Die Figur zeigt den zeitlichen Verlauf des durch die Spule fließen¬ den Stromes, insbesondere während der Zeit des Stellungswechsels des Gaswechselventils.The figure shows the time course of the current flowing through the coil, in particular during the time of the change of position of the gas exchange valve.
Solange das Gaswechselventil in seiner einen Ruhestellung, der Off¬ nungs- oder Schließstellung, verharrt, liegt der Anker des Gaswech- seiventils in der Nähe einer stro durchflossenen Spule, wobei der Stromdurchfluß durch diese Spule Haltekraft auf den Anker des Gas¬ wechselventils ausübt. Wird nun der Stromdurchfl.uß durch die Spu- le abgeschaltet, bricht die Haltekraft zusammen. Ein Federsystem wirkt auf das Gaswechselventil ein und beschleunigt es in Richtung der anderen Ruhestellung. Wie in der DE-OS 3024 109 beschrieben, ist die Mittellage dieses Federsystems zwischen den beiden Ruhe¬ stellungen, so daß das Federsystem das Gaswechselventil derart be¬ aufschlagt, daß es über seine Ruhelage hinaus etwa bis in die ande¬ re Arbeitsstellung bewegt wird.As long as the gas exchange valve remains in its one rest position, the open or closed position, the armature of the gas exchange valve is in the vicinity of a coil through which current flows, the current flow through this coil exerting holding force on the armature of the gas exchange valve. If the current flow through the coil is switched off, the holding force breaks down. A spring system acts on the gas exchange valve and accelerates it towards the other rest position. As described in DE-OS 3024 109, the central position of this spring system is between the two rest positions, so that the spring system acts on the gas exchange valve in such a way that it is moved beyond its rest position to approximately the other working position.
Dabei ist die der anderen Arbeitsstellung zugeordnete Spule erregt, so daß der Anker, wenn er in die Nähe des Spulenkerns gerät, von diesem eingefangen wird und durch den Stromdurchfluß durch die Spu¬ le in seiner anderen Arbeitsstellung gehalten wird.The coil assigned to the other working position is excited so that the armature, when it comes into the vicinity of the coil core, is caught by the latter and is held in its other working position by the current flow through the coil.
Es sei nun angenommen, daß der mit Spule 1 bezeichnete Stromverlauf den Stromverlauf in der Spule wiedergibt, der für die Schließstel¬ lung des Gaswechselventils verantwortlich ist. Soll das Gaswechsel¬ ventil öffnen, wird zum Zeitpunkt t, der Strom durch die Spule 1 abgeschaltet, so daß der Anker durch die Federkraft in die Öffnungs¬ stellung des Gaswechselventils gedrückt wird.It is now assumed that the current profile denoted by coil 1 represents the current profile in the coil which is responsible for the closed position of the gas exchange valve. If the gas exchange valve is to open, the current through the coil 1 is switched off at time t, so that the armature is pressed into the open position of the gas exchange valve by the spring force.
Da der Rechner den Zeitpunkt t.vorher berechnet hat, weiß der Rech¬ ner gleichzeitig, wann der Anker des Gaswechselventils an den Pol¬ flächen des Spulenkerns auftreffen wird, der dazu dient, das Gas¬ wechselventil in der geöffneten Stellung zu halten. Um bei dem Auf¬ treffen des Ankers auf den Polflächen einen genügend hohen Strom aufgebaut zu haben, der eine ausreichende Kraft zum Einfangen des Ankers sicherstellt, wird rechtzeitig vorher zu einem Zeitpunkt tQ der Strom in der Spule 2 eingeschaltet. Zum Zeitpunkt t2 trifft der Anker auf der Polfläche der Spule 2 auf, was im StromverlaufSince the computer calculated the time t beforehand, the computer knows at the same time when the armature of the gas exchange valve will hit the pole faces of the coil core, which serves to hold the gas exchange valve in the open position. In order to have built up a sufficiently high current when the armature strikes the pole faces, which ensures sufficient force to catch the armature, the current in the coil 2 is switched on in good time beforehand at a time t Q. At time t 2 , the armature hits the pole face of coil 2, which is in the course of the current
_- durch einen entsprechenden kleinen Einschnitt erkennbar ist._- is recognizable by a corresponding small incision.
Während die Zeitpunkte tQ, zu denen der Stromanstieg eingeleitet wird, und der Zeitpunkt t,, zu dem die Spule 1 abschaltet, über den Kurbelwellenwinkel gesteuert werden, ist der Zeitraum zwischen den Zeitpunkten t, und t„, also die Flugphase des Gaswechselventils, in der der Anker von der Berührung der einen Polfläche zur Berüh¬ rung der anderen Polfläche kommt, unabhängig vom Kurbelwellenwinkel und unabhängig von der Drehzahl. Dieser Zeitraum t„ - t, hängt ab von der Klebzeit des Ankers an der Polfläche, bevor er sich löst, und von der reinen Flugzeit, die im wesentlichen- beeinflußt wird von der Kraft der Federn, die auf das Gaswechselventil einwirken.While the times t Q , at which the current rise is initiated, and the time t 1, at which the coil 1 switches off, are controlled via the crankshaft angle, the time period between the times t 1 and t 1, that is to say the flight phase of the gas exchange valve, in which the armature comes from the contact of one pole face to the other pole face, regardless of the crankshaft angle and regardless of the speed. This period t "- t depends on the sticking time of the armature on the pole face before it comes loose and on the pure flight time, which is essentially influenced by the force of the springs which act on the gas exchange valve.
Erfindungsgemäß wird nun der Rechner.auf eine Zeitbasis umgeschal¬ tet, um, beginnend mit dem Zeitpunkt t. , zu einem Zeitpunkt t,, der zeitlich etwas später als der erwartete Auftreffzeitpuπkt liegt, den Fangstrom in Spule 2 abzuschalten, so daß der durch die Spule 2 verlaufende Strom, bedingt durch eine FreilaufSchaltung, allmäh¬ lich wieder abnimmt, um anschließend in eine getaktete Haltephase zu gehen.According to the invention, the computer is now switched over to a time base in order to, starting at time t. , at a point in time t ,, which is somewhat later than the expected impact time, to switch off the capture current in coil 2, so that the current running through the coil 2 gradually decreases again due to a freewheeling circuit, in order to subsequently switch into a clocked one Hold phase to go.
Der Zeitraum zwischen t„ und t, ist dabei ein gewisser Sicherheits¬ raum, um zu garantieren, daß das Gaswechselventil von der Spule 2 auch tatsächlich eingefangen wurde und das Gaswechselventil dem¬ entsprechend in seiner vollen Öffnungsstellung gehalten wird.The period between t 1 and t is a certain safety space in order to guarantee that the gas exchange valve has actually been caught by the coil 2 and that the gas exchange valve is accordingly kept in its full open position.
Zum Zeitpunkt t, wird wieder auf Kurbelwelleninformation umgeschal¬ tet, da jetzt das Ende der getakteten Haltephase, das dem Zeitpunkt t, der Spule 1 entspricht, möglichst genau, abhängig von der Kur¬ belwellenstellung festgelegt werden soll, um den Wirkungsgrad der Brennkraftmaschine zu optimieren. At time t, the system switches back to crankshaft information, since the end of the clocked holding phase, which corresponds to time t, of coil 1, should now be determined as precisely as possible, depending on the crankshaft position, in order to optimize the efficiency of the internal combustion engine .

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zum Betreiben einer Brennkraftmaschine mit mindestens einem Gaswechselventil, das in seiner geöffneten Stellung durch die Erregung einer ersten Magnetspule gehalten wird, das in sei¬ ner Schließstellung durch die Erregung einer zweiten Magnetspu¬ le gehalten wird, und das mit Federkraft beaufschlagt von der geöffneten Stellung in die Schließstellung durch Abschalten der ersten Magnetspule und von der Schließstellung in die geöffnete Stellung durch Abschalten der zweiten Spule bewegt wird, d a ¬ d u r c h g e k e n n z e i c h n e t , daß die Festlegung des Zeitpunktes des Abschaltens durch einen Rechner erfolgt, daß bis zum Zeitpunkt des Abschaltens der Rechner den Zeitpunkt auf der Basis von Kurbelwellenwinkelinformationen ermittelt, und daß zumindest während der anschließenden Bewegung des Gas¬ wechselventils der Rechner durch eine Zeitbasis gesteuert wird.1. Method for operating an internal combustion engine with at least one gas exchange valve, which is held in its open position by the excitation of a first magnet coil, which is held in its closed position by the excitation of a second magnet coil, and which is acted upon by spring force Open position is moved to the closed position by switching off the first solenoid and from the closed position to the open position by switching off the second coil, since ¬ characterized in that the determination of the time of switching off takes place by a computer that until the time of switching off the computer determines the point in time on the basis of crankshaft angle information, and that the computer is controlled by a time base, at least during the subsequent movement of the gas exchange valve.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n ¬ z e i c h n e t , daß während der Steuerung des Rechners durch die Zeitbasis die Kurbelwellenwinkelinformation ausgewertet wer¬ den, um Drehzahländerungen zu ermitteln. 2. The method of claim 1, d a d u r c h g e k e n n ¬ z e i c h n e t that the crankshaft angle information are evaluated during the control of the computer by the time base to determine speed changes.
EP86904141A 1985-07-05 1986-06-25 Method for operating an internal combustion engine Expired EP0229793B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3524025 1985-07-05
DE19853524025 DE3524025A1 (en) 1985-07-05 1985-07-05 METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE

Publications (2)

Publication Number Publication Date
EP0229793A1 true EP0229793A1 (en) 1987-07-29
EP0229793B1 EP0229793B1 (en) 1988-08-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904141A Expired EP0229793B1 (en) 1985-07-05 1986-06-25 Method for operating an internal combustion engine

Country Status (4)

Country Link
EP (1) EP0229793B1 (en)
JP (1) JPH07111127B2 (en)
DE (2) DE3524025A1 (en)
WO (1) WO1987000240A1 (en)

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Publication number Priority date Publication date Assignee Title
ES2018226B3 (en) * 1986-10-13 1991-04-01 Audi Ag PROCEDURE FOR THE WORK OF AN INTERNAL COMBUSTION ENGINE
JPH0635812B2 (en) * 1988-10-31 1994-05-11 いすゞ自動車株式会社 Electromagnetically driven valve controller
JPH0617642B2 (en) * 1988-10-31 1994-03-09 いすゞ自動車株式会社 Electromagnetically driven valve controller
DE3923477A1 (en) * 1989-07-15 1991-01-24 Fev Motorentech Gmbh & Co Kg METHOD FOR CONTROLLING THE ANCHOR MOTION OF SHIFTING MAGNETS
JPH04259614A (en) * 1991-02-12 1992-09-16 Hideo Yoshikawa Valve system of internal combustion engine
DE19741570A1 (en) * 1997-09-20 1999-03-25 Heinz Leiber Electromagnetic actuator for controlling valve
DE19756342C2 (en) * 1997-12-18 2003-02-13 Conti Temic Microelectronic Method for controlling an internal combustion engine
JP3487216B2 (en) 1999-05-11 2004-01-13 トヨタ自動車株式会社 Solenoid driven valve
US6405693B2 (en) * 2000-02-28 2002-06-18 Toyota Jidosha Kabushiki Kaisha Internal combustion engine and method for controlling valve of internal combustion engine

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US1471861A (en) * 1921-09-07 1923-10-23 Perrault Oscar Louis Valve-actuating mechanism for internal-combustion engines
DE2343905C2 (en) * 1973-08-31 1982-10-07 Daimler-Benz Ag, 7000 Stuttgart Device for digital-electronic control of the inlet, outlet and injection valves as well as the ignition in internal combustion engines
JPS5952111B2 (en) * 1976-04-09 1984-12-18 キユーピー株式会社 Quantitative filling device
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Also Published As

Publication number Publication date
DE3524025A1 (en) 1987-01-15
WO1987000240A1 (en) 1987-01-15
JPS62503182A (en) 1987-12-17
JPH07111127B2 (en) 1995-11-29
EP0229793B1 (en) 1988-08-17
DE3660558D1 (en) 1988-09-22

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