EP1159513A1 - Valve control for an internal combustion engine - Google Patents

Valve control for an internal combustion engine

Info

Publication number
EP1159513A1
EP1159513A1 EP00988608A EP00988608A EP1159513A1 EP 1159513 A1 EP1159513 A1 EP 1159513A1 EP 00988608 A EP00988608 A EP 00988608A EP 00988608 A EP00988608 A EP 00988608A EP 1159513 A1 EP1159513 A1 EP 1159513A1
Authority
EP
European Patent Office
Prior art keywords
gas exchange
opening
exchange valve
closing
delay time
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
EP00988608A
Other languages
German (de)
French (fr)
Other versions
EP1159513B1 (en
Inventor
Hermann Gaessler
Udo Diehl
Karsten Mischker
Rainer Walter
Stefan Franzl
Juergen Schiemann
Christian Grosse
Volker Beuche
Stefan Reimer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1159513A1 publication Critical patent/EP1159513A1/en
Application granted granted Critical
Publication of EP1159513B1 publication Critical patent/EP1159513B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation

Definitions

  • the invention relates to a method and a valve control for controlling a gas exchange valve for setting the output of an internal combustion engine by opening and closing the gas exchange valve, the opening and / or closing of the gas exchange valve taking place as a function of a delay in opening and / or closing the gas exchange valve,
  • the object is achieved according to the invention by a method according to claim 1 and by a valve control according to claim 12.
  • the power of an internal combustion engine is adjusted by opening and closing a gas exchange valve, the opening and / or closing of the gas exchange valve depending on a delay time when opening and / or closing the gas exchange valve, and the gas exchange valve determining the delay time for a predetermined adjustment time is adjusted and the opening and / or closing of the gas exchange valve is detected.
  • a signal for opening the gas exchange valve is formed as a function of an opening delay time between the start of the signal for opening the gas exchange valve and the opening of the gas exchange valve, and the signal for opening the gas exchange valve is output for the predetermined adjustment time.
  • Signal for closing the gas exchange valve depending on a closing delay time between the start of the signal for closing the gas exchange valve and the closing of the gas exchange valve formed and the signal for closing the gas exchange valve for a predetermined adjustment time output.
  • the adjustment time is extended if no opening and / or closing of the gas exchange valve is detected.
  • the adjustment time is extended until an opening and / or closing of the gas exchange valve is detected.
  • the opening delay time and / or the closing delay time is determined as a function of the adjustment time when an opening and / or closing of the gas exchange valve is detected.
  • the opening delay time and / or the closing delay time is set equal to the control time when an opening and / or closing of the gas exchange valve is detected.
  • the opening delay time and / or the closing delay time for the gas exchange valve is determined independently of the opening delay time and / or the closing delay time of other gas exchange valves of the internal combustion engine.
  • the opening delay time and / or the closing delay time for the gas exchange valve between operating phases of the internal combustion engine is determined.
  • Gas exchange valve for determining the opening delay time and / or the closing delay time independently of an adjustment of the necessary due to the operation of the internal combustion engine Gas exchange valve adjusted.
  • the opening and / or closing of the gas exchange valve is detected by structure-borne noise measurement, airborne noise measurement, air mass measurement, cylinder-specific air mass measurement, intake manifold pressure measurement and / or combustion chamber pressure measurement.
  • FIG. 3 shows a signal for an outflow valve
  • FIG. 4 shows a signal for an inflow valve
  • Fig. 7 shows a total air mass flow over time.
  • valve 1 shows a valve control 10 for controlling an inflow valve 3 and an outflow valve 4 for adjusting a gas exchange valve 1 of an internal combustion engine.
  • the gas exchange valve 1 is arranged in a cylinder head 5.
  • An opening 8 is opened or closed by means of the gas exchange valve 1 and thus an air mass flow m 1 is set through the opening 8 into a cylinder of the internal combustion engine.
  • a pump 6 is also provided for pumping hydraulic fluid.
  • the inflow or outflow of hydraulic fluid into a hydraulic actuator 2 is controlled by means of the inflow valve 3 and the outflow valve 4 and thus the gas exchange valve 1 is moved. If the inflow valve 3 is open and the outflow valve 4 is closed, hydraulic fluid flows into the hydraulic actuator 2 such that the valve moves in the direction z.
  • the inflow valve 3 is closed and the outflow valve 4 is open, hydraulic fluid flows out in this way the hydraulic actuator 2 that the gas exchange valve 1 moves in the direction -z.
  • a reservoir 7 for hydraulic fluid is provided for receiving hydraulic fluid flowing out through the outflow valve 4.
  • the inflow valve 3 and the outflow valve 4 are controlled by the valve control 10 by signals s3 and s4.
  • the valve control 10 is connected to a structure-borne noise sensor, airborne sound sensor, air mass sensor, intake manifold pressure sensor, cylinder-specific air mass sensors, intake manifold pressure sensors and / or combustion chamber pressure sensors, not shown.
  • FIG. 2 shows a flowchart for determining the opening delay time of the gas exchange valve 1, which is implemented on the valve control 10 in an exemplary embodiment.
  • Reference numeral 20 denotes the start of the process and reference symbol 32 the end of the process.
  • a query 21 follows whether there is a so-called thrust. Thrust is understood to mean that the kinetic energy of a vehicle that can be driven by the internal combustion engine moves the internal combustion engine without fuel being burned in the internal combustion engine. If there is no thrust, the program is ended. If, on the other hand, there is thrust, an initialization step 22 follows. In the initialization step 22, it is determined for which ith gas exchange valve of the internal combustion engine the opening delay time is to be determined.
  • Initialization step 22 is followed by a further query 23.
  • Query 23 is used to query whether overrun is present and whether overrun operation (advantageously, for example, with closed gas exchange valves) is permitted. If there is either no overrun or overrun is not permitted, the program is ended. If, on the other hand, there is overrun and overrun is permitted, a query 24 follows whether the air mass flow through opening 8 is greater than zero. Is the air mass flow ⁇ x through opening 8 greater than zero, query 23 in turn follows. If, however, the air mass flow ⁇ x through opening 8 is not greater than zero, step 25 follows.
  • the gas exchange valve is adjusted for an adjustment time T ⁇ -d).
  • the outflow valve 4 is first closed by output of the signal s4, as z. B. is shown in Fig. 3. Then the inflow valve 3 is opened by the signal s3 for a long time T M (i), as shown in FIG. 4. 3 and 4 show signals s4 and s3 over time t. After closing the inflow valve 3, the outflow valve 4 is opened again.
  • Step 25 is followed by a query 26, which corresponds to query 24. That is, the question follows whether the air mass flow m 1 through the opening 8 is greater than zero. Is the
  • a step 28 follows in which the adjustment time T ⁇ (i) is increased by a value ⁇ .
  • the gas exchange valve the adjustment time T ⁇ d) is adjusted in the manner as it is carried out with respect to step 25.
  • Step 28 is followed by a query 29 which corresponds to queries 24 and 26. That is, the question follows whether the air mass flow rr through the opening 8 is greater than zero. Is the
  • the query 30 corresponds to the query 23. If there is no overrun operation (more) or the overrun operation is no longer permissible, the program is ended. If, on the other hand, there is overrun and the overrun operation is permissible, step 28 follows again.
  • step 31 follows.
  • the opening delay time becomes equal to the current adjustment time T M (i) and then the adjustment time T M (i ) to its initialization value (as in initialization step 22).
  • the value i is increased by 1 in step 31. If this new value i is greater than the number of gas exchange valves for which the method described above is to be carried out, then i is set to 1.
  • Step 31 is followed by query 23.
  • the flow chart according to FIG. 2 can also be used in an analogous manner for determining the closing delay time of the gas exchange valve 1. The gas exchange valve is closed for a control time T M (i) from the open state.
  • the open state of the inflow valve 3 and the closed state of the outflow valve 4 are assumed for a defined time.
  • the inflow valve 3 is closed and then the outflow valve 4 is opened for an adjustment time T ⁇ Ci).
  • Queries 26 and 29 are to be replaced by the query whether m is zero.
  • FIG. 5 shows the position z of the gas exchange valve 1 over time t in response to the signals s4 and s3 according to FIGS. 3 and
  • Fig. 4. shows the air mass flow ri through the opening 8 in Fig. 1. By measuring this air mass flow t . B.
  • Measure gas exchange valves Such an air mass flow m is shown by way of example in FIG. 7, the air mass flow m being plotted over time t. Due to the distance between gas exchange valve 1 and a sensor for measuring the total air mass flow m, the effect of opening the
  • Gas exchange valve 1 in the total air mass flow is delayed by a dead time ⁇ .
  • the opening of the gas exchange valve 1 can thus be detected by evaluating the total air mass flow m.
  • the evaluation can e.g. B. take place such that the total air mass flow m in a time window in which a reaction in the total air mass flow m due to the opening of the
  • Gas exchange valve 1 is expected to be monitored. It is also possible to determine the integral of the total mass flow m or its

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a valve control for controlling a gas two-way valve provided for adjusting the output of an internal combustion engine by opening and closing the gas two-way valve. The invention also relates to a method for controlling the gas two-way valve, whereby the opening and/or closing of the gas two-way valve occurs according to a delay during the opening and/or closing of the gas two-way valve. In addition, the gas two-way valve alters a preset adjusting time over a long period of time in order to determine the delay time, and the opening and/or closing of the gas two-way valve is detected.

Description

Beschreibungdescription
Ventilsteuerung für einen VerbrennungsmotorValve control for an internal combustion engine
Die Erfindung betrifft ein Verfahren und eine Venrilsteuerung zum Ansteuern eines Gaswechselventils zur Einstellung der Leistung eines Verbrennungsmotors durch Öffnen und Schließen des Gaswechselventils, wobei das Öffnen und/oder Schließen des Gaswechselventils in Abhängigkeit einer Verzugszeit beim Öffnen und/oder Schließen des Gaswechselventils erfolgt,The invention relates to a method and a valve control for controlling a gas exchange valve for setting the output of an internal combustion engine by opening and closing the gas exchange valve, the opening and / or closing of the gas exchange valve taking place as a function of a delay in opening and / or closing the gas exchange valve,
Es ist Aufgabe der Erfindung, die Einstellung eines Gaswechselventils zu verbessern bzw. zu vereinfachen.It is an object of the invention to improve or simplify the setting of a gas exchange valve.
Die Aufgabe wird erfindungsgemäß durch ein Verfahren gemäß Anspruch 1 sowie durch eine Ventilsteuerung gemäß Anspruch 12 gelöst. Dabei erfolgt die Einstellung der Leistung eines Verbrennungsmotors durch Öffnen und Schließen eines Gaswechselventils, wobei das Öffnen und/oder Schließen des Gaswechselventils in Abhängigkeit einer Verzugszeit beim Öffnen und/oder Schließen des Gaswechselventils erfolgt, und wobei das Gaswechselventu zur Bestimmung der Verzugszeit eine vorgegebene Verstellzeit lang verstellt und das Öffnen und/oder das Schließen des Gaswechselventils detektiert wird.The object is achieved according to the invention by a method according to claim 1 and by a valve control according to claim 12. The power of an internal combustion engine is adjusted by opening and closing a gas exchange valve, the opening and / or closing of the gas exchange valve depending on a delay time when opening and / or closing the gas exchange valve, and the gas exchange valve determining the delay time for a predetermined adjustment time is adjusted and the opening and / or closing of the gas exchange valve is detected.
In vorteilhafter Ausgestaltung der Erfindung wird ein Signal zum Öffnen des Gaswechselventils in Abhängigkeit einer Öffnungs- Verzugszeit zwischen dem Beginn des Signals zum Öffnen des Gaswechselventils und dem Öffnen des Gaswechselventils gebildet und das Signal zum Öffnen des Gaswechselventils die vorgegebene Verstellzeit lang ausgegeben.In an advantageous embodiment of the invention, a signal for opening the gas exchange valve is formed as a function of an opening delay time between the start of the signal for opening the gas exchange valve and the opening of the gas exchange valve, and the signal for opening the gas exchange valve is output for the predetermined adjustment time.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird einIn a further advantageous embodiment of the invention, a
Signal zum Schließen des Gaswechselventils in Abhängigkeit einer Schließ-Verzugszeit zwischen dem Beginn des Signals zum Schließen des Gaswechselventils und dem Schließen des Gaswechselventils gebildet und das Signals zum Schließen des Gaswechselventils die vorgegebene Verstellzeit lang ausgegeben.Signal for closing the gas exchange valve depending on a closing delay time between the start of the signal for closing the gas exchange valve and the closing of the gas exchange valve formed and the signal for closing the gas exchange valve for a predetermined adjustment time output.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Verstellzeit verlängert, wenn kein Öffnen und/oder Schließen des Gaswechselventils detektiert wird.In a further advantageous embodiment of the invention, the adjustment time is extended if no opening and / or closing of the gas exchange valve is detected.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Verstellzeit so lange verlängert, bis ein Öffnen und/oder Schließen des Gaswechselventils detektiert wird.In a further advantageous embodiment of the invention, the adjustment time is extended until an opening and / or closing of the gas exchange valve is detected.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit in Abhängigkeit der Verstelltzeit ermittelt, wenn ein Öffnen und/oder Schließen des Gaswechselventils detektiert wird.In a further advantageous embodiment of the invention, the opening delay time and / or the closing delay time is determined as a function of the adjustment time when an opening and / or closing of the gas exchange valve is detected.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit gleich der VersteUzeit gesetzt, wenn ein Öffnen und/oder Schließen des Gaswechselventils detektiert wird.In a further advantageous embodiment of the invention, the opening delay time and / or the closing delay time is set equal to the control time when an opening and / or closing of the gas exchange valve is detected.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit für das Gaswechselventil unabhängig von der Öffnungs-Verzugszeit und/oder der Schließ-Verzugszeit anderer Gaswechselventile des Verbrennungsmotors bestimmt.In a further advantageous embodiment of the invention, the opening delay time and / or the closing delay time for the gas exchange valve is determined independently of the opening delay time and / or the closing delay time of other gas exchange valves of the internal combustion engine.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit für das Gaswechselventil zwischen Betriebsphasen des Verbrennungsmotors bestimmt .In a further advantageous embodiment of the invention, the opening delay time and / or the closing delay time for the gas exchange valve between operating phases of the internal combustion engine is determined.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird dasIn a further advantageous embodiment of the invention
Gaswechselventil zur Bestimmung der Öffnungs-Verzugszeit und/oder der Schließ-Verzugszeit unabhängig von einer durch den Betrieb des Verbrennungsmotors notwendigen Verstellung des Gaswechselventils verstellt.Gas exchange valve for determining the opening delay time and / or the closing delay time independently of an adjustment of the necessary due to the operation of the internal combustion engine Gas exchange valve adjusted.
In weiterhin vorteilhafter Ausgestaltung der Erfindung wird das Öffnen und/oder Schließen des Gaswechselventils durch Körperschallmessung, Luftschallmessung, Luftmassenmessung, zylinderindividuelle Luftmassenmessung, Saugrohrdruckmessung und/oder Brennraumdruckmessung detektiert.In a further advantageous embodiment of the invention, the opening and / or closing of the gas exchange valve is detected by structure-borne noise measurement, airborne noise measurement, air mass measurement, cylinder-specific air mass measurement, intake manifold pressure measurement and / or combustion chamber pressure measurement.
Weitere Vorteile und Einzelheiten ergeben sich aus nachfolgender Beschreibung von Ausführungsbeispielen. Im Einzelnen zeigen:Further advantages and details emerge from the following description of exemplary embodiments. Show in detail:
Fig. 1 eine Einrichtung zur Einstellung eines Gaswechselventils ,1 shows a device for setting a gas exchange valve,
Fig. 2 einen Ablaufplan zur Steuerung eines Gaswechselventils,2 shows a flow chart for controlling a gas exchange valve,
Fig. 3 ein Signal für ein Abströmventil, Fig. 4 ein Signal für ein Zuströmventil,3 shows a signal for an outflow valve, FIG. 4 shows a signal for an inflow valve,
Fig. 5 die Position eines Gaswechselventils über die Zeit,5 shows the position of a gas exchange valve over time,
Fig. 6 einen Luftmassenstrom über die Zeit,6 shows an air mass flow over time,
Fig. 7 einen Gesamtluftmassenstrom über die Zeit.Fig. 7 shows a total air mass flow over time.
Fig. 1 zeigt eine Ventilsteuerung 10 zur Steuerung eines Zuströmventils 3 und eines Abströmventils 4 zur Einstellung eines Gaswechselventils 1 eines Verbrennungsmotors. Das Gaswechselventil 1 ist einem Zylinderkopf 5 angeordnet. Mittels des Gaswechselventils 1 wird eine Öffnung 8 geöffnet oder geschlossen und somit ein Luftmassenstrom m1 durch die Öffnung 8 in einen Zylinder des Verbrennungsmotors eingestellt. Es ist zudem eine Pumpe 6 zum Pumpen von Hydraulikflüssigkeit vorgesehen. Mittels des Zuströmventils 3 und des Abströmventils 4 wird der Zu- bzw. der Abfluß von Hydraulikflüssigkeit in einen hydraulischen Steller 2 gesteuert und damit das Gaswechselventil 1 bewegt . Ist das Zuströmventil 3 geöffnet und das Abströmventil 4 geschlossen, so strömt Hydraulikflüssigkeit derart in den hydraulischen Steller 2, daß sich das Ventil in Richtung z bewegt. Ist dagegen das Zuströmventil 3 geschlossen und das Abströmventil 4 geöffnet, strömt Hydraulikflüssigkeit derart aus dem hydraulischen Steller 2, daß sich das Gaswechselventil 1 in Richtung -z bewege. Zur Aufnahme von durch das Abströmventil 4 abströmender Hydraulikflüssigkeit ist ein Speicher 7 für Hydraulikflüssigkeit vorgesehen. Das Zuströmventil 3 und das Abströmvenril 4 werden durch Signale s3 und s4 von der Ventilsteuerung 10 gesteuert. Dazu ist die Ventilsteuerung 10 mit einem nicht dargestellten Körperschallsensor, Luftschallsensor, Luftmassensensor, Saugrohrdrucksensor, zylinderindividuellen Luftmassensensoren, Saugrohrdrucksensoren und/oder Brennraumdrucksensoren verbunden.1 shows a valve control 10 for controlling an inflow valve 3 and an outflow valve 4 for adjusting a gas exchange valve 1 of an internal combustion engine. The gas exchange valve 1 is arranged in a cylinder head 5. An opening 8 is opened or closed by means of the gas exchange valve 1 and thus an air mass flow m 1 is set through the opening 8 into a cylinder of the internal combustion engine. A pump 6 is also provided for pumping hydraulic fluid. The inflow or outflow of hydraulic fluid into a hydraulic actuator 2 is controlled by means of the inflow valve 3 and the outflow valve 4 and thus the gas exchange valve 1 is moved. If the inflow valve 3 is open and the outflow valve 4 is closed, hydraulic fluid flows into the hydraulic actuator 2 such that the valve moves in the direction z. If, on the other hand, the inflow valve 3 is closed and the outflow valve 4 is open, hydraulic fluid flows out in this way the hydraulic actuator 2 that the gas exchange valve 1 moves in the direction -z. A reservoir 7 for hydraulic fluid is provided for receiving hydraulic fluid flowing out through the outflow valve 4. The inflow valve 3 and the outflow valve 4 are controlled by the valve control 10 by signals s3 and s4. For this purpose, the valve control 10 is connected to a structure-borne noise sensor, airborne sound sensor, air mass sensor, intake manifold pressure sensor, cylinder-specific air mass sensors, intake manifold pressure sensors and / or combustion chamber pressure sensors, not shown.
Fig. 2 zeigt einen Ablaufplan zur Bestimmung der Öffnungs- Verzugszeit des Gaswechselventils 1, der in beispielhafter Ausgestaltung auf der Ventilsteuerung 10 implementiert ist. Dabei bezeichnen Bezugszeichen 20 den Beginn des Ablaufs und Bezugszeichen 32 das Ende des Ablaufs. Nach Beginn 20 dieses Ablaufs folgt eine Abfrage 21, ob sogenannter Schub vorliegt. Unter Schub ist dabei zu verstehen, daß die Bewegungsenergie eines Fahrzeugs, das mit dem Verbrennungsmotor antreibar ist, den Verbrennungsmotor bewegt, ohne daß Kraftstoff im Verbrennungsmotor verbrannt wird. Liegt kein Schub vor, wird das Programm beendet. Liegt dagegen Schub vor, so folgt ein Initialisierungsschritt 22. Im Initialisierungsschritt 22 wird festgelegt, für welches i-te Gaswechselventil des Verbrennungsmotors die Öffnungs-Verzugszeit ermittelt werden soll.2 shows a flowchart for determining the opening delay time of the gas exchange valve 1, which is implemented on the valve control 10 in an exemplary embodiment. Reference numeral 20 denotes the start of the process and reference symbol 32 the end of the process. After the start 20 of this process, a query 21 follows whether there is a so-called thrust. Thrust is understood to mean that the kinetic energy of a vehicle that can be driven by the internal combustion engine moves the internal combustion engine without fuel being burned in the internal combustion engine. If there is no thrust, the program is ended. If, on the other hand, there is thrust, an initialization step 22 follows. In the initialization step 22, it is determined for which ith gas exchange valve of the internal combustion engine the opening delay time is to be determined.
Dem Initialisierungsschritt 22 folgt eine weitere Abfrage 23. Mittels der Abfrage 23 wird abgefragt, ob Schub vorliegt und ob Schubbetrieb (vorteilhaft z.B. mit geschlossenen Gaswechselventilen) zulässig ist. Liegt entweder kein Schub vor oder ist Schubbetrieb nicht zulässig, so wird das Programm beendet . Liegt dagegen Schub vor und ist der Schubbetrieb zulässig, so folgt eine Abfrage 24, ob der Luftmassenstrom durch die Öffnung 8 größer null ist. Ist der Luftmassenstrom τx durch die Öffnung 8 größer null, so folgt wiederum die Abfrage 23. Ist der Luftmassenstrom τ x durch die Öffnung 8 dagegen nicht größer null, so folgt ein Schritt 25.Initialization step 22 is followed by a further query 23. Query 23 is used to query whether overrun is present and whether overrun operation (advantageously, for example, with closed gas exchange valves) is permitted. If there is either no overrun or overrun is not permitted, the program is ended. If, on the other hand, there is overrun and overrun is permitted, a query 24 follows whether the air mass flow through opening 8 is greater than zero. Is the air mass flow τx through opening 8 greater than zero, query 23 in turn follows. If, however, the air mass flow τ x through opening 8 is not greater than zero, step 25 follows.
Im Schritt 25 wird für das i-te Gaswechselventil die Verzugszeit TM(i) gleich einem Wert x gesetzt: TM(i) = x. Zudem wird das Gaswechselventil eine Verstellzeit T^-d) lang verstellt. Dazu wird zunächst das Abströmventil 4 durch Ausgabe des Signals s4 geschlossen, wie dies z. B. in Fig. 3 gezeigt ist. Danach wird das Zuströmventil 3 durch das Signal s3 die Verstellzeit TM(i) lang geöffnet, wie dies Fig. 4 zeigt. In Fig. 3 und Fig. 4 sind dabei die Signale s4 und s3 über die Zeit t dargestellt. Nach Schließen des Zuströmvenrils 3 wird das Abströmventil 4 wieder geöffnet .In step 25, the delay time T M (i) is set to a value x for the i-th gas exchange valve: T M (i) = x. In addition, the gas exchange valve is adjusted for an adjustment time T ^ -d). For this purpose, the outflow valve 4 is first closed by output of the signal s4, as z. B. is shown in Fig. 3. Then the inflow valve 3 is opened by the signal s3 for a long time T M (i), as shown in FIG. 4. 3 and 4 show signals s4 and s3 over time t. After closing the inflow valve 3, the outflow valve 4 is opened again.
Dem Schritt 25 folgt eine Abfrage 26, die der Abfrage 24 entspricht. Das heißt, es folgt die Abfrage, ob der Luftmassenstrom m1 durch die Öffnung 8 größer null ist. Ist derStep 25 is followed by a query 26, which corresponds to query 24. That is, the question follows whether the air mass flow m 1 through the opening 8 is greater than zero. Is the
Luftmassenstrom iii, durch die Öffnung 8 größer null, so wird in einem Schritt 27 der Wert x um einen Wert n-Δ verkleinert, n ist dabei ein Zahlenwert, z.B. 3, und Δ eine Zeitdauer. Dem Schritt 27 folgt die Abfrage 23.Air mass flow iii, through the opening 8 greater than zero, the value x is reduced by a value n-Δ in a step 27, n being a numerical value, e.g. 3, and Δ a time period. Step 27 is followed by query 23.
Ergibt die Abfrage 26 dagegen, daß der Luftmassenstrom m. durch das Gaswechselventil 1 bzw. die Öffnung 8 nicht größer null ist, so folgt ein Schritt 28, in dem die Verstellzeit Tω(i) um einen Wert Δ erhöht wird. Zudem wird das Gaswechselventil die Verstellzeit T^d) lang in der Weise verstellt, wie es bezüglich Schritt 25 ausσeführt ist.On the other hand, query 26 reveals that the air mass flow m. through the gas exchange valve 1 or the opening 8 is not greater than zero, a step 28 follows in which the adjustment time T ω (i) is increased by a value Δ. In addition, the gas exchange valve the adjustment time T ^ d) is adjusted in the manner as it is carried out with respect to step 25.
Dem Schritt 28 folgt eine Abfrage 29, die den Abfragen 24 und 26 entspricht. Das heißt, es folgt die Abfrage, ob der Luftmassenstrom rr durch die Öffnung 8 größer null ist. Ist derStep 28 is followed by a query 29 which corresponds to queries 24 and 26. That is, the question follows whether the air mass flow rr through the opening 8 is greater than zero. Is the
Luftmassenstrom rh.. durch die Öffnung 8 nicht größer null, so folgt eine Abfrage 30, ob Schub vorliegt, und ob der Schubbetrieb zulässig ist. Die Abfrage 30 entspricht dabei der Abfrage 23. Liegt kein Schubbetrieb (mehr) vor oder ist der Schubbetrieb nicht (mehr) zulässig, so wird das Programm beendet. Liegt dagegen Schub vor, und ist der Schubbetrieb zulässig, so folgt wiederum der Schritt 28.Air mass flow rh. , through the opening 8 not greater than zero, so a query 30 follows as to whether there is overrun and whether overrun is permitted. The query 30 corresponds to the query 23. If there is no overrun operation (more) or the overrun operation is no longer permissible, the program is ended. If, on the other hand, there is overrun and the overrun operation is permissible, step 28 follows again.
Ergibt die Abfrage 29 dagegen, daß der Luftmassenstrom mα durch die Öffnung 8 größer null ist, so folgt ein Schritt 31. Im Schritt 31 wird die Öffnungs-Verzugszeit gleich der aktuellen Verstellzeit TM(i) sowie anschließend die Verstellzeit TM(i) auf ihren Initialisierungswert (wie im Initialisierungsschritt 22) gesetzt. Weiterhin wird im Schritt 31 der Wert i um 1 erhöht. Ist dieser neue Wert i größer als die Anzahl der Gaswechselventile, für die oben beschriebenes Verfahren durchgeführt werden soll, so wird i gleich 1 gesetzt. Dem Schritt 31 folgt die Abfrage 23. Der Ablaufplan gemäß Fig. 2 ist in analoger Weise auch für die Bestimmung der Schließ-Verzugszeit des Gaswechselventils 1 anwendbar. Dabei wird das Gaswechselventil eine VersteUzeit TM(i) lang vom geöffneten Zustand aus geschlossen. In bezug auf das Ausführungsbeispiel gemäß Fig. 1 wird dabei für eine definierte Zeit vom geöffneten Zustand des Zuströmventils 3 und vom geschlossenen Zustand des Abströmventils 4 ausgegangen. Es wird das Zuströmventil 3 geschlossen und anschließend das Abströmventil 4 eine Verstellzeit T^Ci) lang geöffnet. Die Abfragen 26 und 29 sind durch die Abfrage, ob m gleich null ist, zu ersetzen.On the other hand, if query 29 shows that the air mass flow m α through opening 8 is greater than zero, step 31 follows. In step 31, the opening delay time becomes equal to the current adjustment time T M (i) and then the adjustment time T M (i ) to its initialization value (as in initialization step 22). Furthermore, the value i is increased by 1 in step 31. If this new value i is greater than the number of gas exchange valves for which the method described above is to be carried out, then i is set to 1. Step 31 is followed by query 23. The flow chart according to FIG. 2 can also be used in an analogous manner for determining the closing delay time of the gas exchange valve 1. The gas exchange valve is closed for a control time T M (i) from the open state. With reference to the exemplary embodiment according to FIG. 1, the open state of the inflow valve 3 and the closed state of the outflow valve 4 are assumed for a defined time. The inflow valve 3 is closed and then the outflow valve 4 is opened for an adjustment time T ^ Ci). Queries 26 and 29 are to be replaced by the query whether m is zero.
Die Fig. 3 bis 7 verdeutlichen das Ausführungsbeispiel gemäß Fig. 2. Dabei zeigt Fig. 5 die Position z des Gaswechselventils 1 über die Zeit t in Reaktion auf die Signale s4 und s3 gemäß Fig. 3 und3 to 7 illustrate the exemplary embodiment according to FIG. 2. FIG. 5 shows the position z of the gas exchange valve 1 over time t in response to the signals s4 and s3 according to FIGS. 3 and
Fig. 4. Fig. 6 zeigt den Luftmassenstrom ri durch die Öffnung 8 in Fig. 1. Durch Messung dieses Luftmassenstroms t können z. B.Fig. 4. Fig. 6 shows the air mass flow ri through the opening 8 in Fig. 1. By measuring this air mass flow t . B.
Abfragen 24, 26 und 29 im Ablaufplan gemäß Fig. 2 erfolgen. Der Luftmassenstrom * durch die Öffnung 8 eines einzelnen Gaswechselventils 1 ist schwer meßbar. Es ist einfacher, den Gesamtluftmassenstrom m durch eine Luftversorgung für mehrereQueries 24, 26 and 29 take place in the flow chart according to FIG. 2. The air mass flow * through the opening 8 of an individual Gas exchange valve 1 is difficult to measure. It is easier to measure the total air mass flow m by one air supply for several
Gaswechselventile zu messen. Einen solchen Luftmassenstrom m zeigt beispielhaft Fig. 7, wobei der Luftmassenstrom m über der Zeit t aufgetragen ist . Bedingt durch die Distanz zwischen Gaswechselventil 1 und einem Sensor zur Messung des Gesamtluftmassenstroms m zeigt sich die Wirkung des Öffnens desMeasure gas exchange valves. Such an air mass flow m is shown by way of example in FIG. 7, the air mass flow m being plotted over time t. Due to the distance between gas exchange valve 1 and a sensor for measuring the total air mass flow m, the effect of opening the
Gaswechselventils 1 im Gesamtluftmassenstrom itt um eine Totzeit τ verzögert . Durch Auswertung des Gesamtluftmassenstroms m ist somit das Öffnen des Gaswechselventils 1 detektierbar . Die Auswertung kann z. B. derart erfolgen, daß der Gesamtluftmassenstrom m in einem Zeitfenster in dem eine Reaktion im Gesamtluftmassenstrom m auf Grund der Öffnung desGas exchange valve 1 in the total air mass flow is delayed by a dead time τ. The opening of the gas exchange valve 1 can thus be detected by evaluating the total air mass flow m. The evaluation can e.g. B. take place such that the total air mass flow m in a time window in which a reaction in the total air mass flow m due to the opening of the
Gaswechselventils 1 zu erwarten ist, überwacht wird. Ferner ist es möglich, das Integral des Gesamtmassenstroms m bzw. dessenGas exchange valve 1 is expected to be monitored. It is also possible to determine the integral of the total mass flow m or its
Mittelwert zu bilden und ein Ansteigen des Integrals bzw. des Mittelwerts beim Öffnen des Gaswechselventils 1 und damit des Luftmassenstroms ± durch die Öffnung 8 zu detektieren.To form the mean and to detect an increase in the integral or the mean when opening the gas exchange valve 1 and thus the air mass flow ± through the opening 8.
Es ist ferner möglich, das Öffnen und/oder Schließen des Gaswechselventils 1 durch KörperSchallmessung, Luftschallmessung, Saugrohrdruckmessung und/oder Brennraumdruckmessung zu detektieren. In diesem Fall sind die Abfragen 24, 26 und 29 im Ablaufplan gemäß Fig. 2 durch die Abfrage, ob das Gaswechselventil geöffnet ist, bzw. im Falle einer Körperschallmessung, ob das Gaswechselventil auf dem Ventilsitz aufgeschlagen ist, zu ersetzen. It is also possible to detect the opening and / or closing of the gas exchange valve 1 by means of body sound measurement, airborne sound measurement, intake manifold pressure measurement and / or combustion chamber pressure measurement. In this case, queries 24, 26 and 29 in the flowchart according to FIG. 2 are to be replaced by the query as to whether the gas exchange valve is open or, in the case of structure-borne noise measurement, whether the gas exchange valve is open on the valve seat.

Claims

Patentansprüche claims
1. Verfahren zum Ansteuern eines Gaswechselventils (1) zur Einstellung der Leistung eines Verbrennungsmotors durch Öffnen und Schließen des Gaswechselventils (1) , wobei das Öffnen und/oder Schließen des Gaswechselventils (1) in Abhängigkeit einer Verzugszeit beim Öffnen und/oder Schließen des Gaswechselventils (1) erfolgt, d a d u r c h g e k e n n z e i c h n e t, daß das Gaswechselventil (1) zur Bestimmung der Verzugszeit eine vorgegebene Verstellzeit (Tffl) lang verstellt und das Öffnen und/oder das Schließen des Gaswechselventils (1) detektiert wird.1. A method for controlling a gas exchange valve (1) for adjusting the performance of an internal combustion engine by opening and closing the gas exchange valve (1), the opening and / or closing of the gas exchange valve (1) depending on a delay time when opening and / or closing the gas exchange valve (1), characterized in that the gas exchange valve (1) is adjusted for determining the delay time for a predetermined adjustment time (T ffl ) and the opening and / or closing of the gas exchange valve (1) is detected.
2. Verfahren nach Anspruch 1, wobei ein Signal zum Öffnen des Gaswechselventils (1) in Abhängigkeit einer Öffnungs-Verzugszeit zwischen dem Beginn des Signals zum Öffnen des Gaswechselventils (1) und dem Öffnen des Gaswechselventils (1) gebildet wird, d a d u r c h g e k e n n z e i c h n e t, daß das Signal zum Öffnen des Gaswechselventils (1) die vorgegebene Verstellzeit (TM) lang ausgegeben wird.2. The method according to claim 1, wherein a signal for opening the gas exchange valve (1) is formed as a function of an opening delay time between the start of the signal for opening the gas exchange valve (1) and the opening of the gas exchange valve (1), characterized in that Signal for opening the gas exchange valve (1) for the specified adjustment time (T M ) is output.
3. Verfahren nach Anspruch 1 oder 2, wobei ein Signal zum Schließen des Gaswechselventils (1) in Abhängigkeit einer Schließ-Verzugszeit zwischen dem Beginn des Signals zum Schließen des Gaswechselventils (1) und dem Schließen des Gaswechselventils (1) gebildet wird, d a d u r c h g e k e n n z e i c h n e t, daß das Signal zum Schließen des Gaswechselventils (1) die vorgegebene Verstellzeit (TM) lang ausgegeben wird.3. The method according to claim 1 or 2, wherein a signal for closing the gas exchange valve (1) is formed depending on a closing delay time between the start of the signal for closing the gas exchange valve (1) and the closing of the gas exchange valve (1), characterized in that that the signal for closing the gas exchange valve (1) is output for a long time (T M ).
4. Verfahren nach Anspruch 1, 2 oder 3, d a d u r c h g e k e n n z e i c h n e t, daß die Verstellzeit verlängert wird, wenn kein Öffnen und/oder Schließen des Gaswechselventils (1) detektiert wird.4. The method according to claim 1, 2 or 3, characterized in that the adjustment time is extended if no opening and / or closing of the gas exchange valve (1) is detected.
5. Verfahren nach Anspruch 1 , 2 , 3 oder 4 , d a d u r c h g e k e n n z e i c h n e t, daß die Verstellzeit (TM) so lange verlängert wird, bis ein Öffnen und/oder Schließen des Gaswechselventils (1) detektiert wird.5. The method according to claim 1, 2, 3 or 4, characterized in that the adjustment time (T M ) is extended until an opening and / or closing of the gas exchange valve (1) is detected.
6. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit in Abhängigkeit der Verstellzeit ermittelt wird, wenn ein Öffnen und/oder Schließen des Gaswechselventils (1) detektiert wird.6. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the opening delay time and / or the closing delay time is determined depending on the adjustment time when an opening and / or closing of the gas exchange valve (1) is detected.
7. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit gleich der VersteUzeit gesetzt wird, wenn ein Öffnen und/oder Schließen des Gaswechselventils (1) detektiert wird.7. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the opening delay time and / or the closing delay time is set equal to the tax time when an opening and / or closing of the gas exchange valve (1) is detected.
8. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e , daß die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit für das Gaswechselventil (1) unabhängig von der Öffnungs-Verzugszeit und/oder der Schließ-Verzugszeit anderer Gaswechselventile des Verbrennungsmotors bestimmt wird.8. The method according to any one of the preceding claims, that the opening delay time and / or the closing delay time for the gas exchange valve (1) is determined independently of the opening delay time and / or the closing delay time of other gas exchange valves of the internal combustion engine.
9. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß die Öffnungs-Verzugszeit und/oder die Schließ-Verzugszeit für das Gaswechselventil (1) zwischen Betriebsphasen des Verbrennungsmotors bestimmt wird.9. The method according to any one of the preceding claims, that the opening delay time and / or the closing delay time for the gas exchange valve (1) is determined between operating phases of the internal combustion engine.
10. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß das Gaswechselventil (1) zur Bestimmung der Öffnungs- Verzugszeit und/oder der Schließ-Verzugszeit unabhängig von einer durch den Betrieb des Verbrennungsmotors notwendigen Verstellung des Gaswechselventils (1) verstellt wird. 10. The method according to any one of the preceding claims, characterized in that the gas exchange valve (1) for determining the opening delay time and / or the closing delay time is adjusted independently of an adjustment of the gas exchange valve (1) necessary by the operation of the internal combustion engine.
11. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß das Öffnen und/oder Schließen des Gaswechselventils (1) durch Körperschallmessung, Luftschallmessung, Luf massenmessung, Saugrohrdruckmessung, zylinderindividuelle Luf massenmessung, zylinderindividuelle Saugrohrdruckmessung und/oder zylinderindividuelle Brennraumdruckmessung detektiert wird.11. The method according to any one of the preceding claims, that the opening and / or closing of the gas exchange valve (1) by structure-borne noise measurement, airborne sound measurement, air mass measurement, intake manifold pressure measurement, cylinder-specific air mass measurement, cylinder-specific intake manifold pressure measurement and / or cylinder-individual combustion chamber measurement is performed.
12. Ventilsteuerung (10) zum Ansteuern eines Gaswechselventils (1) zur Einstellung der Leistung eines Verbrennungsmotors durch12. Valve control (10) for controlling a gas exchange valve (1) for adjusting the performance of an internal combustion engine
Öffnen und Schließen des Gaswechselventils (1) , insbesondere gemäß einem Verfahren nach einem der vorhergehenden Ansprüche, wobei das Öffnen und/oder Schließen des Gaswechselventils (1) in Abhängigkeit einer Verzugszeit beim Öffnen und/oder Schließen des Gaswechselventils (1) erfolgt, d a d u r c h g e k e n n z e i c h n e t, daß die Ventilsteuerung (10) das Gaswechselventil (1) zur Bestimmung der Öffnungs-Verzugszeit und/oder der Schließ- Verzugszeit eine vorgegebene Verstellzeit (T^) lang verstellt und das Öffnen und/oder das Schließen des Gaswechselventils (1) detektiert . Opening and closing the gas exchange valve (1), in particular according to a method according to one of the preceding claims, wherein the opening and / or closing of the gas exchange valve (1) takes place as a function of a delay in opening and / or closing the gas exchange valve (1), characterized in that that the valve control (10) adjusts the gas exchange valve (1) for determining the opening delay time and / or the closing delay time for a predetermined adjustment time (T ^) and detects the opening and / or closing of the gas exchange valve (1).
EP00988608A 1999-12-30 2000-11-10 Valve control for an internal combustion engine Expired - Lifetime EP1159513B1 (en)

Applications Claiming Priority (3)

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DE19963753 1999-12-30
DE19963753A DE19963753A1 (en) 1999-12-30 1999-12-30 Valve control for an internal combustion engine
PCT/DE2000/004014 WO2001049981A1 (en) 1999-12-30 2000-11-10 Valve control for an internal combustion engine

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DE50012453D1 (en) 2006-05-11

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