DE10256592A1 - Controlling combustion air feed to cylinder of internal combustion piston engine involves controlling inlet valve closing time point depending on current load acting on engine by varying inlet cam - Google Patents
Controlling combustion air feed to cylinder of internal combustion piston engine involves controlling inlet valve closing time point depending on current load acting on engine by varying inlet cam Download PDFInfo
- Publication number
- DE10256592A1 DE10256592A1 DE10256592A DE10256592A DE10256592A1 DE 10256592 A1 DE10256592 A1 DE 10256592A1 DE 10256592 A DE10256592 A DE 10256592A DE 10256592 A DE10256592 A DE 10256592A DE 10256592 A1 DE10256592 A1 DE 10256592A1
- Authority
- DE
- Germany
- Prior art keywords
- inlet
- cam
- valve
- controlling
- intake
- 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- Withdrawn
Links
Classifications
-
- 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
- F02D13/0223—Variable control of the intake valves only
- F02D13/0234—Variable control of the intake valves only changing the valve timing only
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0057—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by splittable or deformable cams
-
- 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
- F02D13/0269—Controlling the valves to perform a Miller-Atkinson cycle
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L2013/0089—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque with means for delaying valve closing
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
-
- 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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
-
- 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
- F02D13/0261—Controlling the valve overlap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Steuern der Zufuhr von Verbrennungsluft in den Zylinder einer Hubkolben-Brennkraftmaschine und auf ein variables Ventilsteuerungssystem nach dem Oberbegriff des Anspruches 1 bzw. 8.The invention relates to a Method for controlling the supply of combustion air into the cylinder a reciprocating internal combustion engine and to a variable valve timing system according to the preamble of claim 1 or 8.
Aus der Druckschrift
Von diesem Stand der Technik ausgehend liegt der Erfindung das Problem zugrunde, eine Ventilsteuerung mit hoher Variabi lität auszubilden. Mithilfe der Ventilsteuerung soll es insbesondere möglich sein, den Ansaugvorgang weitgehend drosselfrei zu gestalten und die Laststeuerung in einfacher Weise durchführen zu können.Starting from this state of the art The invention is based on the problem, a valve control with high Variability train. With the help of the valve control, it should be possible in particular to make the intake largely throttling and the load control in a simple manner to be able to.
Dieses Problem wird bei dem erfindungsgemäßen Verfahren mit den Merkmalen des Anspruches 1 und bei dem erfindungsgemäßen Ventilsteuerungssystem mit den Merkmalen des Anspruches 8 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This problem is in the inventive method with the features of claim 1 and in the valve control system according to the invention solved with the features of claim 8. The subclaims give appropriate training on.
Bei dem erfindungsgemäßen Verfahren wird die Zufuhr von Verbrennungsluft in den bzw. die Zylinder der Hubkolben-Brennkraftmaschine in der Weise gesteuert, dass der Schließzeitpunkt des Einlassventils durch Verstellen des Einlassnockens als Funktion der aktuell auf die Brennkraftmaschine wirkenden Last gesteuert wird. Hierbei wird in vorteilhafter Ausführung der Schließzeitpunkt mit abnehmender Last nach hinten verschoben, das heißt, das Einlassventil wird mit abnehmender Last zu einem späteren Zeitpunkt geschlossen. Der Öffnungszeitpunkt des Einlassventils kann dagegen konstant gehalten werden. Über eine Verstellung des Schließzeitpunktes des Einlassventils ist eine lastabhängige Steuerung realisierbar, bei der die Öffnungsdauer mit abnehmender Last verlängert wird; wobei der spätere Schließzeitpunkt des Einlassventiles über den unteren Totpunkt des Kolbens hinaus zu einem Rückschieben von Kraftstoff-Luft-Gemisch zurück in das Saugrohr führt und die Menge rückgeschobenen Gemisches über den Schließzeitpunkt einstellbar ist. Auf diese Weise kann die Menge und der Zeitpunkt des in den Zylinder eingeführten Kraftstoff-Luft-Gemisches über die Steuerung des Einlassventils reguliert werden, so dass die Drosselklappe zumindest über weite Betriebsbereiche der Brennkraftmaschine in Öffnungsstellung stehen kann, wodurch der Drosselwiderstand im Ansaugrohr minimiert ist. Ein Drosselorgan im Ansaugrohr wird üblicherweise nur zur Einstellung eines Unterdruckes in niedrigen Last- und Drehzahlbereichen benötigt. Gegebenenfalls kann auch vollständig auf ein Drosselorgan im Ansaugrohr verzichtet werden.In the method according to the invention is the supply of combustion air in the cylinder (s) of the Reciprocating internal combustion engine controlled in such a way that the closing time of the intake valve by adjusting the intake cam as a function of the current the internal combustion engine acting load is controlled. This is in an advantageous embodiment the closing time shifted with decreasing load to the rear, that is, the Intake valve will be with decreasing load at a later time closed. The opening time of the Inlet valve, however, can be kept constant. Over a Adjustment of the closing time the intake valve is a load-dependent control feasible at the opening time extended with decreasing load becomes; the later closing time of the inlet valve the bottom dead center of the piston out to a push back back from fuel-air mixture leads into the suction pipe and the crowd pushed back Mixture over the closing time is adjustable. In this way, the amount and timing of the inserted in the cylinder Fuel-air mixture over the control of the intake valve can be regulated so that the throttle at least for a long time Operating ranges of the internal combustion engine can be in the open position, whereby the throttle resistance in the intake pipe is minimized. A throttle body in the intake pipe is usually only for setting a negative pressure in low load and speed ranges needed. If necessary, it can also be complete to dispense with a throttle body in the intake manifold.
Zur Steuerung des Restgasgehaltes im Zylinder kann die Überschneidung von Auslassventil-Hubkurve und Einlassventil-Hubkurve veränderlich eingestellt werden. Insbesondere für den Fall, dass als Einlassnocken ein Einlass-Öffnet-Nocken und ein Einlass-Schließt-Nocken vorgesehen sind, kann die Hubkurvenüberschneidung durch Verstellung des Einlass-Öffnet-Nockens, gegebenenfalls aber auch zusätzlich oder alternativ durch Verstellung des Auslassnockens erfolgen, welcher für die Hubkurve des Auslassventiles verantwortlich ist. Bei einem größeren Überschneidungsbereich der Hubkurven von Einlassventil und Auslassventil wird aus dem Zylinder bereits ausgestoßenes Abgas, welches sich im Abgasstrang befindet, wieder in den Zylinder hineingesaugt. Auf diese Weise kann eine unmittelbare bzw. direkte Abgasrückführung erzielt werden, durch die insbesondere im Teillastbereich eine Emissionsreduzierung erzielt werden kann.For controlling the residual gas content in the cylinder, the overlap be set variably by exhaust valve lift curve and intake valve lift curve. Especially for the case that as an intake cam, an intake-open cam and an intake-close cam are provided, the Hubkurvenüberschneidung by adjustment the inlet-open cam, if necessary but also in addition or alternatively by adjusting the exhaust cam, which for the Lifting curve of the exhaust valve is responsible. For a larger overlap area The lift curves of intake valve and exhaust valve is already out of the cylinder expelled Exhaust gas, which is located in the exhaust line, back into the cylinder sucked. In this way, an immediate or direct Exhaust gas recirculation achieved be reduced by the particular in the partial load range, an emission reduction can be achieved.
Bei dem erfindungsgemäßen Ventilsteuerungssystem ist der Schließzeitpunkt des Einlassventils durch Veränderung der Phasenlage eines Einlassnockens einstellbar. Zweckmäßig sind zwei die Hubkurve des Einlassventils steuernde Einlassnocken vorgesehen: Ein Einlass-Öffnet-Nocken und ein Einlass-Schließt-Nocken, die vorteilhaft beide auf einer gemeinsamen Nockenwelle sitzen, wodurch eine sehr kompakte Anordnung erreicht wird. Durch eine Verstellung der Phasenlage zwischen den Nocken mithilfe einer Veränderung der Relativdrehlage kann die Hubkurve des Einlassventiles verändert werden. In bevorzugter Weiterbildung ist hierbei vorgesehen, dass der Einlass-Schließt-Nocken drehbar auf der Nockenwelle gelagert ist, wohingegen der Einlass-Öffnet-Nocken drehfest mit der Nockenwelle verbunden sein kann. Gegebenenfalls kann aber auch die Phasenlage des Einlass-Öffnet-Nockens relativ zur Nockenwelle verändert werden.In the valve control system according to the invention is the closing time of the intake valve by change the phase angle of an intake cam adjustable. Are useful two intake cam controlling the lift curve of the intake valve are provided: An inlet-open cam and an inlet-closing cam, which both sit advantageously on a common camshaft, whereby a very compact arrangement is achieved. By an adjustment the phase relationship between the cams by means of a change the relative rotational position, the lift curve of the intake valve can be changed. In preferred development is provided here that the inlet Schließt cam is rotatably supported on the camshaft, whereas the inlet-opening cam rotatably connected to the camshaft can be connected. Possibly but can also be the phase position of the intake-open cam relative to the camshaft changed become.
Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
Das in
Der Ansaugvorgang kann lastabhängig durch
eine Veränderung
der Relativposition von Einlass-Öffnet-Nocken
Aufgrund der überlagerten Bewegungsübertragung
der beiden Nocken
Zur Verstellung der Phasenlage zwischen den
Nocken
In
In
Das Schaubild gemäß
Die mit durchgezogenem Strich dargestellte Erhebungskurve E für das Einlassventil ist dem Volllastzustand der Brennkraftmaschine zugeordnet, die mit strichlierter Linie dargestellte Erhebungskurve E' ist dagegen dem Teillastbetrieb der Brennkraftmaschine zugeordnet. Die Erhebungskurve E' weist gegenüber der Erhebungskurve E einen nach hinten verschobenen Schließzeitpunkt auf, wodurch sich auch der Abschnitt in der Erhebungskurve mit maximalem Hub verlängert. Durch die Verschiebung gelangt der Schließzeitpunkt des Einlassventils in den Bereich, in welchem der Kolben das im Zylinder befindliche Kraftstoffluftgemisch bereits zu verdichten beginnt. Da das Einlassventil in der ersten Verdichtungsphase noch geöffnet ist, wird das im Zylinder befindliche Gemisch in das Saugrohr zurückgeschoben. Auf diese Weise kann die Füllung des Zylinders durch die Einstellung des Schließzeitpunktes des Einlassventiles eingestellt werden.The survey curve E for the intake valve shown in solid line is assigned to the full load state of the internal combustion engine, the survey curve E 'shown with a dashed line, however, is assigned to the partial load operation of the internal combustion engine. The survey curve E 'has with respect to the survey curve E to a rearwardly shifted closing time, which also extends the portion in the survey curve with maximum lift. As a result of the displacement, the closing point of the intake valve reaches the region in which the piston already begins to compress the fuel-air mixture in the cylinder. Since the inlet valve is still open in the first compression phase, the mixture in the cylinder is pushed back into the intake manifold. In this way, the filling of the cylinder by adjusting the closing time of the Inlet valve can be adjusted.
Gegebenenfalls kann auch der Bereich der Überschneidung der Erhebungskurve von Auslassventil und Einlassventil veränderlich eingestellt werden, wodurch der Restgasgehalt gesteuert wird. In dem Überschneidungsbereich bei OT der Erhebungskurven A und E wird bei noch geöffnetem Auslassventil und bereits beginnender Bewegung des Kolbens in Richtung UT ein Unterdruck im Zylinder erzeugt, über den bereits ausgestoßenes Restgas wieder in den Zylinder zurückgesaugt wird. Hierdurch ist eine unmittelbare, direkte Abgasrückführung realisierbar.If necessary, also the area the overlap the elevation curve of exhaust valve and inlet valve variable be adjusted, whereby the residual gas content is controlled. In the overlap area at OT of the elevation curves A and E is still open Exhaust valve and already starting movement of the piston in direction UT generates a negative pressure in the cylinder, over the already exhausted residual gas again sucked back into the cylinder becomes. As a result, a direct, direct exhaust gas recirculation can be realized.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10256592A DE10256592A1 (en) | 2002-12-04 | 2002-12-04 | Controlling combustion air feed to cylinder of internal combustion piston engine involves controlling inlet valve closing time point depending on current load acting on engine by varying inlet cam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10256592A DE10256592A1 (en) | 2002-12-04 | 2002-12-04 | Controlling combustion air feed to cylinder of internal combustion piston engine involves controlling inlet valve closing time point depending on current load acting on engine by varying inlet cam |
Publications (1)
Publication Number | Publication Date |
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DE10256592A1 true DE10256592A1 (en) | 2004-06-17 |
Family
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DE10256592A Withdrawn DE10256592A1 (en) | 2002-12-04 | 2002-12-04 | Controlling combustion air feed to cylinder of internal combustion piston engine involves controlling inlet valve closing time point depending on current load acting on engine by varying inlet cam |
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DE (1) | DE10256592A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011032632A1 (en) * | 2009-09-16 | 2011-03-24 | Thyssenkrupp Presta Teccenter Ag | Camshaft with variable valve opening period |
DE102013020923A1 (en) * | 2013-12-11 | 2015-06-11 | Daimler Ag | Piston engine and associated operating method |
DE102014225054A1 (en) * | 2014-12-05 | 2016-06-09 | Mahle International Gmbh | Adjustable camshaft |
WO2017140351A1 (en) * | 2016-02-16 | 2017-08-24 | Volvo Truck Corporation | A device for controlling at least one valve in an internal combustion engine |
DE102011051353B4 (en) * | 2010-12-06 | 2021-03-04 | Hyundai Motor Co. | Variable valve train device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2921645A1 (en) * | 1979-05-28 | 1980-12-11 | Karl Lehr | Variable timing camshaft for IC engine - has each lobe divided and movable on helix to change overall cam form |
DE2930266A1 (en) * | 1979-07-26 | 1981-02-12 | Volkswagenwerk Ag | CAMSHAFT ARRANGEMENT, IN PARTICULAR FOR AN INTERNAL COMBUSTION ENGINE |
DE4312205C2 (en) * | 1992-04-14 | 1996-06-20 | Mazda Motor | Control device for a loader engine |
DE19847851A1 (en) * | 1997-10-17 | 1999-04-22 | Hitachi Ltd | Valve control for fuel injected IC engine |
-
2002
- 2002-12-04 DE DE10256592A patent/DE10256592A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2921645A1 (en) * | 1979-05-28 | 1980-12-11 | Karl Lehr | Variable timing camshaft for IC engine - has each lobe divided and movable on helix to change overall cam form |
DE2930266A1 (en) * | 1979-07-26 | 1981-02-12 | Volkswagenwerk Ag | CAMSHAFT ARRANGEMENT, IN PARTICULAR FOR AN INTERNAL COMBUSTION ENGINE |
DE4312205C2 (en) * | 1992-04-14 | 1996-06-20 | Mazda Motor | Control device for a loader engine |
DE19847851A1 (en) * | 1997-10-17 | 1999-04-22 | Hitachi Ltd | Valve control for fuel injected IC engine |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011032632A1 (en) * | 2009-09-16 | 2011-03-24 | Thyssenkrupp Presta Teccenter Ag | Camshaft with variable valve opening period |
US8820281B2 (en) | 2009-09-16 | 2014-09-02 | Thyssenkrupp Presta Teccenter Ag | Camshaft with variable valve opening period |
DE102011051353B4 (en) * | 2010-12-06 | 2021-03-04 | Hyundai Motor Co. | Variable valve train device |
DE102013020923A1 (en) * | 2013-12-11 | 2015-06-11 | Daimler Ag | Piston engine and associated operating method |
DE102014225054A1 (en) * | 2014-12-05 | 2016-06-09 | Mahle International Gmbh | Adjustable camshaft |
US9903240B2 (en) | 2014-12-05 | 2018-02-27 | Mahle International Gmbh | Adjustable camshaft |
WO2017140351A1 (en) * | 2016-02-16 | 2017-08-24 | Volvo Truck Corporation | A device for controlling at least one valve in an internal combustion engine |
US10648373B2 (en) | 2016-02-16 | 2020-05-12 | Volvo Truck Corporation | Device for controlling at least one valve in an internal combustion engine |
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