DE10107268A1 - Method for operating direct injection internal combustion engine, involves opening exhaust valve during cylinder induction cycle so previously ejected exhaust gas in exhaust tract is partly sucked back in - Google Patents

Method for operating direct injection internal combustion engine, involves opening exhaust valve during cylinder induction cycle so previously ejected exhaust gas in exhaust tract is partly sucked back in

Info

Publication number
DE10107268A1
DE10107268A1 DE2001107268 DE10107268A DE10107268A1 DE 10107268 A1 DE10107268 A1 DE 10107268A1 DE 2001107268 DE2001107268 DE 2001107268 DE 10107268 A DE10107268 A DE 10107268A DE 10107268 A1 DE10107268 A1 DE 10107268A1
Authority
DE
Germany
Prior art keywords
exhaust
cylinder
exhaust gas
internal combustion
combustion engine
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.)
Ceased
Application number
DE2001107268
Other languages
German (de)
Inventor
Winfried Oppermann
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE2001107268 priority Critical patent/DE10107268A1/en
Publication of DE10107268A1 publication Critical patent/DE10107268A1/en
Ceased legal-status Critical Current

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
    • F02D13/0273—Multiple actuations of a valve within an engine cycle
    • 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
    • F02D13/0242—Variable control of the exhaust valves only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • 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
    • F02M26/01—Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
    • 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
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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

Abstract

The method involves carrying out a charge replacement per working cylinder via cylinder-individual, with suitable control of the inlet and outlet valves. The corresponding exhaust valve is opened during the induction cycle of a cylinder so that a previously ejected exhaust gas in the exhaust tract is partly sucked back into the cylinder.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer direkteinspritzenden Brennkraftmaschine, insbesondere eines Ottomotors, wobei ein Ladungswechsel jeweiliger Arbeitszylinder über zylinderindividuelle, entsprechend gesteuerte Einlaß- und Auslaßventile durchgeführt wird, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for operating a direct injection Internal combustion engine, in particular an Otto engine, with a charge change respective working cylinder via cylinder-specific, appropriately controlled intake and Exhaust valves is carried out according to the preamble of claim 1.

Aus der DE 43 17 660 C1 ist ein direkteinspritzender Ottomotor bekannt, bei dem über Abgasrückführkanäle Abgas von einem Zylinder direkt in einen anderen Zylinder geleitet wird. Hierbei erfolgt die Abgaszuführung derart, daß eine geschichtete Ladung des Zylinders entsteht, wobei in einer zylinderförmigen Abgasmenge ein Frischgas-Kraftstoffgemisch derart erzeugt wird, daß in allen Betriebsphasen λ = 1 erzielt wird. Dies reduziert eine Schadstoffemission entsprechend.From DE 43 17 660 C1 a direct injection gasoline engine is known, in which over Exhaust gas recirculation channels Exhaust gas from one cylinder is directed directly into another cylinder becomes. Here, the exhaust gas is fed in such a way that a stratified charge of Cylinder arises, being in a cylindrical amount of exhaust gas Fresh gas / fuel mixture is generated in such a way that λ = 1 is achieved in all operating phases becomes. This reduces pollutant emissions accordingly.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine direkteinspritzende Brennkraftmaschine bzgl. Schadstoffemission und Kraftstoffverbrauch weiter zu optimieren.The present invention has for its object a direct injection Internal combustion engine with regard to pollutant emissions and fuel consumption optimize.

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 abhängigen Ansprüchen angegeben.This object is achieved according to the invention by a method of the above. Kind of with the in Characteristics characterized claim 1 solved. Advantageous embodiments of the Invention are specified in the dependent claims.

Dazu ist es erfindungsgemäß vorgesehen, daß im Ansaugtakt eines Zylinders das entsprechende Auslaßventil derart geöffnet wird, daß zuvor von diesem Zylinder in den Abgastrakt ausgestoßenes Abgas teilweise in den Zylinder zurück gesaugt wird.For this purpose, it is provided according to the invention that in the intake stroke of a cylinder corresponding exhaust valve is opened such that previously from this cylinder in the Exhaust gas exhaust gas is partially sucked back into the cylinder.

Dies hat den Vorteil, daß bei verminderter Schadstoffemission und vereinfachter Abgasrückführung eine Steigerung des innermotorischen Wirkungsgrades und damit ein reduzierter Kraftstoffverbrauch erzielt wird. Ferner ergibt sich eine Verringerung der Rohemission, insbesondere der HC- und NOx-Werte. This has the advantage that, with reduced pollutant emissions and simplified exhaust gas recirculation, an increase in the efficiency of the engine and thus a reduced fuel consumption is achieved. There is also a reduction in the raw emission, in particular the HC and NO x values.

Zweckmäßigerweise wird die Öffnungszeit und/oder die Öffnungscharakteristik des Auslaßventils im Ansaugtakt derart gewählt, daß sich eine zylinderförmige Abgaswolke im Arbeitszylinder ausbildet.The opening time and / or the opening characteristic of the Exhaust valve selected in the intake stroke such that there is a cylindrical exhaust gas cloud trained in the working cylinder.

Bevorzugt wird dem mit Abgas vorgefüllten Arbeitszylinder anschließend eine derartige Menge Frischluft und Kraftstoff in einer derartigen Weise zugeführt, daß sich eine geschichtete Ladung des Arbeitszylinder sowie ein Kraftstoff/Luft-Verhältnis von λ = 1 einstellt.The working cylinder pre-filled with exhaust gas is then preferred Amount of fresh air and fuel supplied in such a way that a stratified charge of the working cylinder and a fuel / air ratio of λ = 1 established.

Die Ventilsteuerung wird beispielsweise elektrisch, elektromagnetisch, mittels des Piezoeffektes oder hydraulisch durchgeführt.The valve control is, for example, electrical, electromagnetic, by means of the Piezo effect or performed hydraulically.

Zum Aufrechterhalten eines Wertes λ = 1 mit zunehmender Last wird die über das Einlaßventil zugeführte Frischgasmenge entsprechend dem zusätzlich eingespritzten Kraftstoff angepaßt geregelt.In order to maintain a value λ = 1 with increasing load, the over the The amount of fresh gas supplied to the inlet valve corresponds to that additionally injected Adjusted fuel adjusted.

Weitere Merkmale, Vorteile und vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen, sowie aus der nachstehenden Beschreibung der Erfindung.Further features, advantages and advantageous configurations of the invention result from the dependent claims, as well as from the following description of the Invention.

Erfindungsgemäß ist es vorgesehen, daß Abgas aus dem Abgastrakt bzw. im wesentlichen aus dem Abgaskrümmer über das Auslaßventil in denjenigen Brennraum eines Arbeitszylinders zurückgeführt wird, aus dem dieses Abgas zuvor ausgestoßen wurde. Hierzu wird im Ansaugtakt das Auslaßventil nochmals geöffnet, nachdem es im Ausschubtakt bereits wieder teilweise oder vollständig geschlossen war, so daß in der Abgasanlage befindliches Abgas in den Arbeitszylinder zurück gesaugt wird. Es entsteht eine zylinderförmige Abgaswolke in dem Arbeitszylinder. Bei einem Motor mit beispielsweise zwei Auslaßventilen wird zum Erreichen der "gerichteten" Rückströmung des Abgases nur ein Auslaßventil geöffnet.According to the invention it is provided that exhaust gas from the exhaust tract or in essentially from the exhaust manifold via the exhaust valve in that combustion chamber a working cylinder is returned from which this exhaust gas was previously ejected has been. For this purpose, the exhaust valve is opened again in the intake stroke after it is in the Extension stroke was already partially or completely closed, so that in the Exhaust system located exhaust gas is sucked back into the working cylinder. It arises a cylindrical exhaust gas cloud in the working cylinder. With an engine with For example, two exhaust valves are used to achieve the "directed" backflow of the exhaust gas only one exhaust valve opened.

Die Ventilsteuerung erfolgt beispielsweise elektrisch (elektromagnetisch/piezo), hydraulisch oder ähnlich. Das zündfähige Kraftstoff-Luft-Gemisch wird in einer Einspritzdüse mittels eines entsprechenden Einspritzsystems auf ca. λ = 1 gemischt und vor dem Zündzeitpunkt im Brennraum in den Bereich der Zündkerze "eingeblasen". Das Kraftstoff-Luft-Gemisch bleibt stabil im Brennraum stehen, so daß nur eine vernachlässigbare Vermischung an der Peripherie dieser Wolke mit dem vorhandenen Abgas erfolgt und somit eine stabile Entflammung sichergestellt ist. Die Abgasmenge wird über die Last geregelt.The valve control takes place, for example, electrically (electromagnetic / piezo), hydraulic or similar. The ignitable fuel-air mixture is in one Injector mixed to approx. Λ = 1 using a corresponding injection system and "blown" into the area of the spark plug before the ignition point in the combustion chamber. The The fuel-air mixture remains stable in the combustion chamber, so that only one negligible mixing on the periphery of this cloud with the existing one  Exhaust gas occurs and thus a stable ignition is ensured. The amount of exhaust gas is regulated by the load.

Bei zunehmender Last wird das Kraftstoff-Luft-Gemisch in der Einspritzdüse immer fetter, bedingt durch die entsprechend größer werdende Kraftstoffmenge. Damit ein Betrieb mit λ = 1 aufrecht erhalten wird, wird die Frischgasmenge über das Einlaßventil entsprechend geregelt.As the load increases, the fuel-air mixture in the injector always becomes richer, due to the correspondingly increasing amount of fuel. So that one Operation with λ = 1 is maintained, the amount of fresh gas through the inlet valve regulated accordingly.

Claims (5)

1. Verfahren zum Betreiben einer direkteinspritzenden Brennkraftmaschine, insbesondere eines Ottomotors, wobei ein Ladungswechsel jeweiliger Arbeitszylinder über zylinderindividuelle, entsprechend gesteuerte Einlaß- und Auslaßventile durchgeführt wird, dadurch gekennzeichnet, daß im Ansaugtakt eines Zylinders das entsprechende Auslaßventil derart geöffnet wird, daß ein zuvor von diesem Zylinder in den Abgastrakt ausgestoßenes Abgas teilweise in den Zylinder zurück gesaugt wird.1. A method for operating a direct-injection internal combustion engine, in particular a gasoline engine, wherein a charge change of the respective working cylinder is carried out via cylinder-specific, appropriately controlled intake and exhaust valves, characterized in that the corresponding exhaust valve is opened in the intake stroke of a cylinder in such a way that one of them previously Exhaust gas exhausted into the exhaust tract is partially sucked back into the cylinder. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Öffnungszeit und/oder die Öffnungcharakteristik des Auslaßventils im Ansaugtakt derart gewählt wird, daß sich eine zylinderförmige Abgaswolke im Arbeitszylinder ausbildet.2. The method according to claim 1, characterized in that the opening time and / or the opening characteristic of the exhaust valve selected in the intake stroke is that a cylindrical exhaust gas cloud forms in the working cylinder. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dem mit Abgas vorgefüllten Arbeitszylinder anschließend eine derartige Menge Frischluft und Kraftstoff in einer derartigen Weise zugeführt wird, daß sich eine geschichtete Ladung des Arbeitszylinder sowie ein Kraftstoff/Luft-Verhältnis von λ = 1 einstellt.3. The method according to claim 1 or 2, characterized in that the exhaust gas prefilled cylinder then such a quantity of fresh air and Fuel is supplied in such a way that there is a stratified Load the working cylinder and a fuel / air ratio of λ = 1. 4. Verfahren nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Ventilsteuerung elektrisch, elektromagnetisch, mittels des Piezoeffektes oder hydraulisch durchgeführt wird.4. The method according to at least one of the preceding claims, characterized characterized in that a valve control is electrical, electromagnetic, by means of of the piezo effect or hydraulically. 5. Verfahren nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mit zunehmender Last die über das Einlaßventil zugeführte Frischgasmenge entsprechend dem zusätzlich eingespritzten Kraftstoff derart geregelt wird, daß ein Wert λ = 1 aufrechterhalten wird.5. The method according to at least one of the preceding claims, characterized characterized in that with increasing load the supplied via the inlet valve Fresh gas amount corresponding to the additionally injected fuel it is regulated that a value λ = 1 is maintained.
DE2001107268 2001-02-16 2001-02-16 Method for operating direct injection internal combustion engine, involves opening exhaust valve during cylinder induction cycle so previously ejected exhaust gas in exhaust tract is partly sucked back in Ceased DE10107268A1 (en)

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Application Number Priority Date Filing Date Title
DE2001107268 DE10107268A1 (en) 2001-02-16 2001-02-16 Method for operating direct injection internal combustion engine, involves opening exhaust valve during cylinder induction cycle so previously ejected exhaust gas in exhaust tract is partly sucked back in

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Application Number Priority Date Filing Date Title
DE2001107268 DE10107268A1 (en) 2001-02-16 2001-02-16 Method for operating direct injection internal combustion engine, involves opening exhaust valve during cylinder induction cycle so previously ejected exhaust gas in exhaust tract is partly sucked back in

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10801430B2 (en) 2016-01-19 2020-10-13 Eaton Intelligent Power Limited In-cylinder EGR for air fuel ratio control
US11199162B2 (en) 2016-01-19 2021-12-14 Eaton Intelligent Power Limited In-cylinder EGR and VVA for aftertreatment temperature control

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5115790A (en) * 1989-10-31 1992-05-26 Isuzu Motors Limited Re-combustion control means for alcohol engine
US5203830A (en) * 1992-06-01 1993-04-20 Caterpillar Inc. Method and apparatus to reduce engine combustion noise utilizing unit valve actuation
DE19922697A1 (en) * 1999-05-18 2000-11-23 Man Nutzfahrzeuge Ag Process for internal exhaust gas recirculation in multi-cylinder internal combustion engines
EP1063427A2 (en) * 1999-06-23 2000-12-27 Hitachi, Ltd. Engine control system for controlling in-cylinder fuel injection engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5115790A (en) * 1989-10-31 1992-05-26 Isuzu Motors Limited Re-combustion control means for alcohol engine
US5203830A (en) * 1992-06-01 1993-04-20 Caterpillar Inc. Method and apparatus to reduce engine combustion noise utilizing unit valve actuation
DE19922697A1 (en) * 1999-05-18 2000-11-23 Man Nutzfahrzeuge Ag Process for internal exhaust gas recirculation in multi-cylinder internal combustion engines
EP1063427A2 (en) * 1999-06-23 2000-12-27 Hitachi, Ltd. Engine control system for controlling in-cylinder fuel injection engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10801430B2 (en) 2016-01-19 2020-10-13 Eaton Intelligent Power Limited In-cylinder EGR for air fuel ratio control
US11199162B2 (en) 2016-01-19 2021-12-14 Eaton Intelligent Power Limited In-cylinder EGR and VVA for aftertreatment temperature control

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Effective date: 20140315