DE102007052476A1 - Internal-combustion engine i.e. diesel engine, operating method for motor vehicle, involves selecting amount of exhaust gas and fresh air such that desired predetermined value for thermal capacity of mixture of air and gas is obtained - Google Patents
Internal-combustion engine i.e. diesel engine, operating method for motor vehicle, involves selecting amount of exhaust gas and fresh air such that desired predetermined value for thermal capacity of mixture of air and gas is obtained Download PDFInfo
- Publication number
- DE102007052476A1 DE102007052476A1 DE102007052476A DE102007052476A DE102007052476A1 DE 102007052476 A1 DE102007052476 A1 DE 102007052476A1 DE 102007052476 A DE102007052476 A DE 102007052476A DE 102007052476 A DE102007052476 A DE 102007052476A DE 102007052476 A1 DE102007052476 A1 DE 102007052476A1
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- Germany
- Prior art keywords
- exhaust gas
- fresh air
- mixture
- combustion engine
- air
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/006—Controlling exhaust gas recirculation [EGR] using internal EGR
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
- F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
-
- 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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Betreiben einer Brennkraftmaschine, insbesondere Dieselmotor, insbesondere eines Kraftfahrzeugs, wobei wenigstens einem Brennraum der Brennkraftmaschine jeweils Frischluft und rückgeführtes Abgas zugeführt wird, gemäß dem Oberbegriff des Patentanspruchs 1.The The invention relates to a method for operating an internal combustion engine, in particular diesel engine, in particular a motor vehicle, wherein at least a combustion chamber of the internal combustion engine each fresh air and recirculated Exhaust gas is supplied, according to the preamble of claim 1
Es
ist beispielsweise aus der
Bei
der
Aus
der
Aus
der
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der o. g. Art hinsichtlich der Druckverlaufsregelung bei Brennkraftmaschinen, insbesondere bei Dieselmotoren, zu verbessern.Of the Invention is based on the object, a method of o. G. kind with regard to the pressure variation control in internal combustion engines, especially in diesel engines to improve.
Diese Aufgabe wird erfindungsgemäß durch ein Verfahren der o. g. Art mit den in Anspruch 1 gekennzeichneten Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den weiteren Ansprüchen beschrieben.These The object is achieved by a method the o. g. Art solved with the features characterized in claim 1. Advantageous embodiments of the invention are in the other Claims described.
Dazu ist es bei einem Verfahren der o. g. Art erfindungsgemäß vorgesehen, dass ein gewünschter Wert für die Wärmekapazität c des Gemisches aus Frischluft und Abgas bestimmt wird und dass die Menge des rückgeführtem Abgases sowie die Menge der Frischluft derart gewählt wird, dass sich der gewünschte vorbestimmter Wert für die Wärmekapazität c des Gemisches aus Frischluft und Abgas ergibt.To it is in a method of o. g. Art provided according to the invention, that a desired value for the heat capacity c of the mixture of fresh air and exhaust gas is determined and that the amount of recirculated exhaust gas and the Amount of fresh air is chosen such that the desired predetermined value for the heat capacity c of the mixture of fresh air and exhaust gas results.
Dies hat den Vorteil, dass eine unabhängig von Last, Drehzahl, Abgasrückführ(EGR)-Rate und Ladedruck regelbarer Zylinderdruckverlauf zur direkten Beeinflussung des Emissionsverhaltens und der Verbrennungsakustik zur Verfügung steht. Dies ermöglicht eine von Verbrauchs-, Emissions- sowie Dynamikaspekten unabhängige Optimierung der Verbrennungscharakteristik und der maximalen Zylindertemperaturen und Drücke.This has the advantage that a cylinder pressure curve that can be controlled independently of load, speed, exhaust gas recirculation (EGR) rate and boost pressure is available for directly influencing the emission behavior and the combustion acoustics. This he enables optimization of the combustion characteristics and the maximum cylinder temperatures and pressures independent of consumption, emission and dynamic aspects.
Zweckmäßigerweise wird der gewünschte Wert für die Wärmekapazität c des Gemisches aus Frischluft und Abgas derart bestimmt, dass sich ein vorbestimmter Verlauf des Zylinderinnendruckes über den Kurbelwinkel ergibt.Conveniently, becomes the desired value for the heat capacity c of the mixture of fresh air and exhaust gas determined so that a predetermined course of the cylinder internal pressure over gives the crank angle.
Eine unabhängig vom Ladedruck wählbare Ansaugmasse der Frischluft erzielt man über ein veränderbares Schluckverhalten dadurch, dass die Menge der Frischluft und/oder die Menge des rückgeführten Abgases mittels eines variablen Ventiltriebes eingestellt wird. Dies ermöglicht eine Entkopplung von Dichteveränderung (Ladedruck) und Zusammensetzung der Frischladung (EGR-Rate). Die an der Verbrennung beteiligte Wärmekapazität kann unabhängig von anderen Parametern geregelt werden.A Independent of the boost pressure selectable intake the fresh air is achieved via a variable Swallowing behavior in that the amount of fresh air and / or the amount of recirculated exhaust gas by means of a variable valve train is adjusted. this makes possible a decoupling of density change (boost pressure) and Composition of fresh charge (EGR rate). The burning involved heat capacity can be independent be controlled by other parameters.
Die Erfindung wird im Folgenden anhand der Zeichnung näher erläutert. Diese zeigt in der einzigen Fig. einen Verlauf des Zylinderdruckes über den Kurbelwinkel.The The invention will be explained in more detail below with reference to the drawing explained. This shows in the only Fig. A course the cylinder pressure over the crank angle.
In
der einzigen Fig. ist auf einer horizontalen Achse
Der
resultierende Zylinderdruckgradient ist aufgeteilt in die beiden
Anteile β1
Der Lastzustand der Brennkraftmaschine ist gekennzeichnet durch die zu verbrennende Kraftstoffmenge Q. Diese bestimmt den Mindestsauerstoffmassenbedarf (λ = 1) für eine russfreie (russarme) Verbrennung. Die besonders interessante NOx arme Verbrennung erfordert Luftverhältnisse von λ < 1,5. Zur Einstellung des Luftverhältnisses werden verschiedene Arten von EGR-Systemen verwendet, um beispielsweise den dieseltypischen hohen Luftüberschuss (in Teillastpunkten λ > 3) durch Ersatz von Frischluft durch sauerstoffärmeres Abgas zu reduzieren. Insbesondere bei höheren Lasten setzt der Mindestluftbedarf hier Grenzen. Durch angepasste Aufladung kann diese Grenze zu höheren Lasten hin verschoben werden. Zunehmende Ladungswechselverluste verursachen dabei jedoch zunehmend Probleme durch Kraftstoffverbrauchsverschlechterungen.The load state of the internal combustion engine is characterized by the amount of fuel Q to be combusted. This determines the minimum oxygen mass requirement (λ = 1) for a soot-free (low-emission) combustion. The particularly interesting NO x poor combustion requires air ratios of λ <1.5. To adjust the air ratio, various types of EGR systems are used, for example, to reduce the diesel-typical high excess air (in partial load points λ> 3) by replacing fresh air with oxygen-poor exhaust gas. Especially at higher loads, the minimum air requirement sets limits here. With custom charging, this limit can be shifted to higher loads. Increasing charge cycle losses, however, are increasingly causing fuel economy degradation problems.
Ein alternativer Weg führt über das mittels variablen Ventiltrieb (VVT) veränderte Schluckverhalten der Brennkraftmaschine. Hierbei wird das Luftverhältnis ohne Zugabe von Abgas reduziert. Damit gewinnt man einen Freiheitsgrad, der den Ansatzpunkt für die Zylinderdruckverlaufsregelung liefert. Hierbei spielt die Wärmekapazität c des rückgeführten Abgases eine wesentliche Rolle. Bei einem konventionellen System (ohne variablen Ventiltrieb VVT) wird Abgas benötigt, um das Luftverhältnis abzusenken bzw. einzustellen, wobei sich automatisch die Wärmekapazität c der Frischladung verändert oder umgekehrt wird die Wärmekapazität verändert, wobei sich automatisch das Luftverhältnis ergibt. Über das Zusammenspiel von Schluckcharakteristik, ggf. Aufladegrad und Abgasrückführung werden unabhängig voneinander das Luftverhältnis und die an der Verbrennung teilnehmende Abgasmasse im Sinne einer Wärmekapazität verändert. Nutzt man nun beispielsweise den variablen Ventiltrieb VVT, um das Luftverhältnis einzustellen, kann man die Wärmekapazität c des Gasgemisches im Arbeitszylinder davon nahezu unabhängig über die Abgasmenge variieren und damit den Zylinderdruckgradienten regeln.One alternative way leads over that by means of variable Valve train (VVT) changed the engine's absorption behavior. Here, the air ratio is reduced without the addition of exhaust gas. This gives you a degree of freedom that is the starting point for the cylinder pressure control supplies. This plays the heat capacity c of the recirculated exhaust gas is an essential role. In a conventional system (without variable valve train VVT) is Exhaust gas needed to lower the air ratio or to adjust, whereby automatically the heat capacity c changes the fresh charge or vice versa, the heat capacity changed, whereby automatically the air ratio results. About the interaction of swallowing characteristics, Charge level and exhaust gas recirculation may become independent each other the air ratio and the combustion Participating exhaust mass in terms of heat capacity changed. If one uses now, for example, the variable valve train VVT, to adjust the air ratio, you can adjust the heat capacity c of the gas mixture in the working cylinder thereof almost independently over vary the amount of exhaust gas and thus regulate the cylinder pressure gradient.
Für die Bestimmung des Zylinderdruckes ist ein Zylinderdrucksensor oder alternativ eine Brennverlaufsberechnung vorgesehen, welche die Zylinderdruckmessung ersetzt. In einem Maximalkonzept für minimale Regelungsabweichungen und optimale Dynamik sind sowohl die Zylinderdruckmessung mittels Zylinderdrucksensor als auch eine parallele, zweckmäßigerweise schneller als die reale Verbrennung ablaufende, Vorausberechnung enthalten, die weitere Vorteile insbesondere im Instationärbetrieb bieten.For the determination of the cylinder pressure, a cylinder pressure sensor or alternatively a combustion curve calculation is provided which replaces the cylinder pressure measurement. In a maximum concept for minimal control deviations and optimal dynamics, both the cylinder pressure measurement with Contain cylinder pressure sensor as well as a parallel, expediently faster than the real combustion running, precalculation, which offer further advantages, especially in transient operation.
Das
Bezugszeichen
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 19749816 A1 [0002, 0003] DE 19749816 A1 [0002, 0003]
- - DE 4341796 [0002] - DE 4341796 [0002]
- - DE 10316113 A1 [0004] DE 10316113 A1 [0004]
- - DE 10159017 A1 [0005, 0005] - DE 10159017 A1 [0005, 0005]
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102007052476.7A DE102007052476B4 (en) | 2007-11-02 | 2007-11-02 | Method for operating an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102007052476.7A DE102007052476B4 (en) | 2007-11-02 | 2007-11-02 | Method for operating an internal combustion engine |
Publications (2)
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DE102007052476A1 true DE102007052476A1 (en) | 2009-05-07 |
DE102007052476B4 DE102007052476B4 (en) | 2020-03-26 |
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DE102007052476.7A Expired - Fee Related DE102007052476B4 (en) | 2007-11-02 | 2007-11-02 | Method for operating an internal combustion engine |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2910755A1 (en) * | 2014-02-20 | 2015-08-26 | GE Jenbacher GmbH & Co OG | Method for operating a combustion engine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4341796A1 (en) | 1993-12-08 | 1995-09-14 | Bosch Gmbh Robert | Method for controlling the combustion in the combustion chamber of an internal combustion engine |
DE19749816A1 (en) | 1997-11-11 | 1999-05-12 | Bosch Gmbh Robert | Procedure for determining a form factor for energy conversion |
DE10159017A1 (en) | 2001-12-01 | 2003-06-18 | Bosch Gmbh Robert | Method and device for controlling an internal combustion engine |
DE10316113A1 (en) | 2003-04-09 | 2004-10-28 | Daimlerchrysler Ag | Method for operating an internal combustion engine with auto-ignition |
WO2005028833A2 (en) * | 2003-09-19 | 2005-03-31 | U.S. Environmental Protection Agency | Methods for low emission, controlled temperature combustion in engines which utilize late direct cylinder injection of fuel |
US20060000457A1 (en) * | 2002-12-23 | 2006-01-05 | Shenquiang Huang | Method of modifying exhaust valve timing to improve engine performance |
-
2007
- 2007-11-02 DE DE102007052476.7A patent/DE102007052476B4/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4341796A1 (en) | 1993-12-08 | 1995-09-14 | Bosch Gmbh Robert | Method for controlling the combustion in the combustion chamber of an internal combustion engine |
DE19749816A1 (en) | 1997-11-11 | 1999-05-12 | Bosch Gmbh Robert | Procedure for determining a form factor for energy conversion |
DE10159017A1 (en) | 2001-12-01 | 2003-06-18 | Bosch Gmbh Robert | Method and device for controlling an internal combustion engine |
US20060000457A1 (en) * | 2002-12-23 | 2006-01-05 | Shenquiang Huang | Method of modifying exhaust valve timing to improve engine performance |
DE10316113A1 (en) | 2003-04-09 | 2004-10-28 | Daimlerchrysler Ag | Method for operating an internal combustion engine with auto-ignition |
WO2005028833A2 (en) * | 2003-09-19 | 2005-03-31 | U.S. Environmental Protection Agency | Methods for low emission, controlled temperature combustion in engines which utilize late direct cylinder injection of fuel |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2910755A1 (en) * | 2014-02-20 | 2015-08-26 | GE Jenbacher GmbH & Co OG | Method for operating a combustion engine |
KR20150098580A (en) * | 2014-02-20 | 2015-08-28 | 게 옌바허 게엠베하 운트 콤파니 오게 | Method of operating an internal combustion engine |
US10161320B2 (en) | 2014-02-20 | 2018-12-25 | Ge Jenbacher Gmbh & Co Og | Method of operating an internal combustion engine |
KR102234973B1 (en) | 2014-02-20 | 2021-04-01 | 게 옌바허 게엠베하 운트 콤파니 오게 | Method of operating an internal combustion engine |
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DE102007052476B4 (en) | 2020-03-26 |
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