DE19853799A1 - Mixture formation process for fuel injection engine, producing load-dependent fuel-air mixture by combination if induction pipe injection and direct injection - Google Patents

Mixture formation process for fuel injection engine, producing load-dependent fuel-air mixture by combination if induction pipe injection and direct injection

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Publication number
DE19853799A1
DE19853799A1 DE1998153799 DE19853799A DE19853799A1 DE 19853799 A1 DE19853799 A1 DE 19853799A1 DE 1998153799 DE1998153799 DE 1998153799 DE 19853799 A DE19853799 A DE 19853799A DE 19853799 A1 DE19853799 A1 DE 19853799A1
Authority
DE
Germany
Prior art keywords
injection
fuel
mixture
combination
direct injection
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Withdrawn
Application number
DE1998153799
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German (de)
Inventor
Stephan Rubbert
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE1998153799 priority Critical patent/DE19853799A1/en
Publication of DE19853799A1 publication Critical patent/DE19853799A1/en
Withdrawn legal-status Critical Current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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • 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
    • F02B15/00—Engines characterised by the method of introducing liquid fuel into cylinders and not otherwise provided for

Abstract

The mixture formation process is for a mixture-sealed external-ignition fuel injection engine. The mixture is formed by a combination of induction pipe injection and direct injection, injecting partial injection amounts controlled or regulated in dependence on the load. A higher proportion of fuel is supplied for idling and partial load.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Gemischbildung bei einer gemisch­ verdichtenden, fremdgezündeten Brennkraftmaschine mit Kraftstoffeinspritzung.The invention relates to a method for mixture formation in a mixture compression-ignition, spark-ignition internal combustion engine with fuel injection.

Bei derzeit eingesetzten Benzin-Direkteinspritzverfahren wird der Kraftstoff aus­ schließlich direkt in den Brennraum eingespritzt. Mit der Lage des Einspritzbeginns wird die Zusammensetzung des Kraftstoff-Luft-Gemisches gesteuert. Bei einem späten Einspritzbeginn gegen Ende der Verdichtungsphase wird ein inhomogenes Gemisch mit einer starken Schichtung realisiert und dabei eine stabile Verbrennung auch bei hohen Luftverhältnissen erreicht. Ein demgegenüber früherer Einspritz­ beginn zu Beginn der Ansaugphase bewirkt ein homogenes Gemisch.In the gasoline direct injection process currently used, the fuel is out finally injected directly into the combustion chamber. With the location of the start of injection the composition of the fuel-air mixture is controlled. At a late start of injection towards the end of the compression phase becomes an inhomogeneous one Mixture realized with a strong stratification and thereby a stable combustion achieved even in high air conditions. In contrast, an earlier injection Beginning at the beginning of the suction phase results in a homogeneous mixture.

Das mögliche Zeitintervall für die Einspritzung ist bei der Direkteinspritzung gegen­ über der Saugrohreinspritzung in nachteiliger Weise erheblich verkürzt, da die Ein­ spritzung frühestens nach dem Schließen des Auslaßventils beginnen kann und vor der Zündung abgeschlossen sein muß. Eine bei der Saugrohreinspritzung mögliche Kraftstoff-Vorlagerung (während der Kompressions- und Verbrennungsphase) ist nicht möglich und somit die Gemischaufbereitung bei der Direkteinspritzung schlechter. Dies führt in nachteiliger Weise zu höheren HC-, CO- und Ruß-Emissio­ nen. Als weiterer Nachteil ist zu nennen, daß speziell bei der homogenen Direkt­ einspritzung während der Ansaugphase ein Teil des Einspritzstrahls auf die Einlaßventil-Teller trifft und der Kraftstoff darüber hinaus teilweise an den Brenn­ raumwänden abgelagert wird. Dies führt auf den Einlaßventilen und am Einspritz­ ventil zu Ablagerungen, die den Kraftstoffstrahl auch im geschichteten Betrieb be­ einflussen und die gewünschte Schichtung verhindern.The possible time interval for the injection is opposed to the direct injection disadvantageously shortened significantly over the intake manifold injection, since the Ein spraying can begin at the earliest after closing the exhaust valve and before the ignition must be completed. One possible with intake manifold injection Fuel pre-storage (during the compression and combustion phase) not possible and therefore the mixture preparation with direct injection worse. This leads disadvantageously to higher HC, CO and soot emissions  nen. Another disadvantage is that especially with the homogeneous direct injection during the intake phase a part of the injection jet on the Intake valve plate hits and the fuel also partially on the burner room walls is deposited. This leads to the intake valves and the injection valve to deposits that be the fuel jet even in stratified operation influence and prevent the desired layering.

Der Erfindung liegt die Aufgabe zugrunde, für eine gemischverdichtende, fremd­ gezündete Brennkraftmaschine mit Kraftstoffeinspritzung ein verbessertes Verfahren zur Gemischbildung aufzuzeigen.The invention is based, for a mixture-compressing, foreign task ignited internal combustion engine with fuel injection an improved method to show the mixture formation.

Diese Aufgabe ist mit dem Patentanspruch 1 dadurch gelöst, daß mittels einer Kom­ bination einer Saugrohreinspritzung mit einer Direkteinspritzung durch jeweilige, lastabhängig gesteuerte/geregelte Teil-Einspritzmengen ein jeweiliges Kraftstoff- Luft-Gemisch gebildet wird.This object is achieved with claim 1 in that by means of a comm combination of an intake manifold injection with a direct injection by respective load-dependent controlled / regulated partial injection quantities a respective fuel Air mixture is formed.

Mit der erfindungsgemäß kombinierten Einspritzung ist es in vorteilhafter Weise möglich, die Nachteile der Direkteinspritzung im geschichteten Betrieb mit den rela­ tiv hohen Schadstoffemissionen und der unvollständigen Verbrennung zu vermei­ den. Gegenüber der ausschließlichen Saugrohreinspritzung eröffnet sich in vorteil­ hafter Weise die Möglichkeit, eine stabile Verbrennung mit gutem Wirkungsgrad und niedrigen Schadstoffemissionen auch bei höheren Luftverhältnissen und Rest­ gasanteilen zu erreichen.With the injection combined according to the invention, it is advantageous possible, the disadvantages of direct injection in stratified operation with the rela Avoid high pollutant emissions and incomplete combustion the. Compared to the exclusive intake manifold injection, this opens up an advantage the possibility of stable combustion with good efficiency and low pollutant emissions even with higher air conditions and rest to reach gas fractions.

Die Erfindung ist im folgenden unter Einbeziehung vorteilhafter Ausgestaltungen beschrieben.The invention is in the following including advantageous configurations described.

Ein Verfahren zur Gemischbildung bei einer gemischverdichtenden, fremdgezünde­ ten Brennkraftmaschine mit Kraftstoffeinspritzung ist erfindungsgemäß dadurch ver­ bessert, daß mittels einer Kombination einer Saugrohreinspritzung mit einer Di­ rekteinspritzung durch jeweilige, lastabhängig gesteuerte/geregelte Teil-Einspritz­ mengen ein jeweiliges Kraftstoff-Luft-Gemisch gebildet wird. A process for mixture formation in a mixture-compressing, spark-ignited th internal combustion engine with fuel injection is thereby ver improves that by means of a combination of an intake manifold injection with a Di direct injection through respective, load-dependent controlled / regulated partial injection a respective fuel-air mixture is formed.  

In Ausgestaltung des erfindungsgemäßen Verfahrens wird im Leerlauf- und Teillast­ bereich über die Saugrohreinspritzung gegenüber der Direkteinspritzung der größere Kraftstoffanteil am Gemisch abgespritzt. Mit dem in diesem Lastbereich direkt eingespritzten Kraftstoff wird ein zündfähiges Gemisch in der Nähe der Zünd­ kerze erzielt und damit eine zuverlässige Entflammung des mageren Gemisches im gesamten Brennraum ermöglicht.In one embodiment of the method according to the invention, the engine is idle and part load area over the intake manifold injection compared to the direct injection of the Hosed larger proportion of fuel in the mixture. With that in this load range Directly injected fuel becomes an ignitable mixture near the ignition achieved candle and thus a reliable ignition of the lean mixture in the entire combustion chamber.

Demgegenüber kann im Vollastbereich der Brennkraftmaschine der Kraftstoffanteil am Gemisch überwiegend bis ganz über die Direkteinspritzung abgespritzt werden, womit die mit der Direkteinspritzung gegebenen Vorteile bezüglich der Zylinder­ füllung und der Klopfgrenze uneingeschränkt auszunützen sind.In contrast, in the full-load range of the internal combustion engine, the fuel percentage are mainly sprayed on the mixture up to completely via direct injection, with which the direct injection advantages regarding the cylinders filling and the knock limit are to be used without restriction.

Um den baulichen Aufwand zur Durchführung des erfindungsgemäßen Verfahrens der kombinierten Einspritzung gering zu gestalten, kennzeichnet sich das erfin­ dungsgemäße Verfahren durch die Verwendung einer Zentraleinspritzung im Be­ reich eines Luftsammlers als Saugrohreinspritzung. Hierbei können die bekannten Nachteile der Zentraleinspritzung im Instationärbetrieb und im Warmlauf sowie die schlechte Gemisch-Gleichverteilung in vorteilhafter Weise durch die kombinierte Direkteinspritzung korrigiert werden.To the structural effort to carry out the method according to the invention The invention is characterized by making the combined injection low method according to the invention by using a central injection in the loading rich of an air collector as an intake manifold injection. Here, the known Disadvantages of the central injection in non-stationary operation and in warm-up as well as the bad mixture uniform distribution advantageously due to the combined Direct injection can be corrected.

Claims (4)

1. Verfahren zur Gemischbildung bei einer gemischverdichtenden, fremd­ gezündeten Brennkraftmaschine mit Kraftstoffeinspritzung, dadurch gekennzeichnet,
  • - daß mittels einer Kombination einer Saugrohreinspritzung mit einer Direkteinspritzung durch jeweilige, lastabhängig gesteuerte/geregelte Teil-Einspritzmengen ein jeweiliges Kraftstoff-Luft-Gemisch gebildet wird.
1. Method for mixture formation in a mixture-compressing, externally ignited internal combustion engine with fuel injection, characterized in that
  • - That a respective fuel-air mixture is formed by means of a combination of an intake manifold injection with a direct injection by respective, load-dependent controlled / regulated partial injection quantities.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß im Leerlauf- und Teillast-Bereich über die Saugrohreinspritzung gegenüber der Direkt­ einspritzung der größere Kraftstoffanteil am Gemisch abgespritzt wird.2. The method according to claim 1, characterized in that at idle and Part load range via the intake manifold injection compared to the direct injection the greater proportion of fuel in the mixture is injected. 3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß im Vollastbereich der Kraftstoffanteil am Gemisch überwiegend bis ganz über die Direkteinspritzung abgespritzt wird.3. The method according to claim 1 and 2, characterized in that in Full load range, the proportion of fuel in the mixture is predominantly up to completely the direct injection is hosed down. 4. Verfahren nach den Ansprüchen 1 bis 3, gekennzeichnet durch die Ver­ wendung einer Zentraleinspritzung im Bereich eines Luftsammlers als Saug­ rohreinspritzung.4. The method according to claims 1 to 3, characterized by the Ver Use of a central injection in the area of an air collector as a suction pipe injection.
DE1998153799 1998-11-21 1998-11-21 Mixture formation process for fuel injection engine, producing load-dependent fuel-air mixture by combination if induction pipe injection and direct injection Withdrawn DE19853799A1 (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006013688A1 (en) * 2004-08-02 2006-02-09 Toyota Jidosha Kabushiki Kaisha Device and method for controlling internal combustion engine
WO2006051924A1 (en) * 2004-11-11 2006-05-18 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
WO2006082694A1 (en) * 2005-02-04 2006-08-10 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
DE102009044160A1 (en) 2008-10-02 2010-04-08 Avl List Gmbh Method for operating a spark-ignited internal combustion engine
DE102011121100A1 (en) * 2011-12-14 2013-06-20 Audi Ag Method for operating internal combustion engine e.g. gasoline engine of motor car, involves injecting second partial quantity of fuel based on cooling effect of amount of air supplied to suction tube
US9920705B2 (en) 2015-12-16 2018-03-20 Robert Bosch, Llc Fuel injection system and method
DE102008001111B4 (en) 2008-04-10 2019-03-28 Robert Bosch Gmbh Method and device for operating an internal combustion engine and internal combustion engine
DE102018002164A1 (en) 2018-03-16 2019-09-19 Daimler Ag Internal combustion engine for a motor vehicle, in particular for motor vehicles
DE102018002165A1 (en) 2018-03-16 2019-09-19 Daimler Ag Internal combustion engine for a motor vehicle
US10619580B2 (en) 2004-11-18 2020-04-14 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US10711712B2 (en) 2004-11-18 2020-07-14 Massachusetts Institute Of Technology Fuel management system for variable ethanol octane enhancement of gasoline engines
DE102008042615B4 (en) 2008-10-06 2023-09-21 Robert Bosch Gmbh Method for introducing fuel into a combustion chamber of an internal combustion engine

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US3154059A (en) * 1962-10-25 1964-10-27 Southwest Res Inst Stratified spark ignition internal combustion engine
DE3444356A1 (en) * 1983-12-05 1985-06-13 Toyota Jidosha K.K., Toyota, Aichi INTERNAL COMBUSTION ENGINE WITH TWO INLET VALVES
US5357925A (en) * 1991-09-13 1994-10-25 Toyota Jidosha Kabushika Kaisha Internal combustion engine
DE4415073A1 (en) * 1994-04-29 1995-11-02 Fev Motorentech Gmbh & Co Kg IC engine using alcohol-based fuel with spark ignition and direct fuel injection
DE19731735C1 (en) * 1997-07-23 1998-10-29 Sergiu Valentin Lipcan Pressure casting method for cylinder head of internal combustion engine
DE19853375A1 (en) * 1997-11-20 1999-06-02 Avl List Gmbh Flue for IC engine with external ignition

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154059A (en) * 1962-10-25 1964-10-27 Southwest Res Inst Stratified spark ignition internal combustion engine
DE3444356A1 (en) * 1983-12-05 1985-06-13 Toyota Jidosha K.K., Toyota, Aichi INTERNAL COMBUSTION ENGINE WITH TWO INLET VALVES
US5357925A (en) * 1991-09-13 1994-10-25 Toyota Jidosha Kabushika Kaisha Internal combustion engine
DE4415073A1 (en) * 1994-04-29 1995-11-02 Fev Motorentech Gmbh & Co Kg IC engine using alcohol-based fuel with spark ignition and direct fuel injection
DE19731735C1 (en) * 1997-07-23 1998-10-29 Sergiu Valentin Lipcan Pressure casting method for cylinder head of internal combustion engine
DE19853375A1 (en) * 1997-11-20 1999-06-02 Avl List Gmbh Flue for IC engine with external ignition

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006013688A1 (en) * 2004-08-02 2006-02-09 Toyota Jidosha Kabushiki Kaisha Device and method for controlling internal combustion engine
US7207315B2 (en) 2004-08-02 2007-04-24 Toyota Jidosha Kabushiki Kaisha Device and method for controlling internal combustion engine
EP1914413A1 (en) 2004-08-02 2008-04-23 Toyota Jidosha Kabushiki Kaisha Device and method for controlling an internal combustion engine
KR100881877B1 (en) 2004-11-11 2009-02-06 도요타 지도샤（주） Control apparatus for internal combustion engine
WO2006051924A1 (en) * 2004-11-11 2006-05-18 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
AU2005302987B2 (en) * 2004-11-11 2010-12-16 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
US7302928B2 (en) 2004-11-11 2007-12-04 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
US10619580B2 (en) 2004-11-18 2020-04-14 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US11067012B2 (en) 2004-11-18 2021-07-20 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US10781760B2 (en) 2004-11-18 2020-09-22 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US10711712B2 (en) 2004-11-18 2020-07-14 Massachusetts Institute Of Technology Fuel management system for variable ethanol octane enhancement of gasoline engines
US11053870B2 (en) 2004-11-18 2021-07-06 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US11168625B2 (en) 2004-11-18 2021-11-09 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US11643985B2 (en) 2004-11-18 2023-05-09 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
US11359559B2 (en) 2004-11-18 2022-06-14 Massachusetts Institute Of Technology Optimized fuel management system for direct injection ethanol enhancement of gasoline engines
KR100879485B1 (en) 2005-02-04 2009-01-20 도요타 지도샤（주） Control apparatus for internal combustion engine
WO2006082694A1 (en) * 2005-02-04 2006-08-10 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
US7185633B2 (en) 2005-02-04 2007-03-06 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
DE102008001111B4 (en) 2008-04-10 2019-03-28 Robert Bosch Gmbh Method and device for operating an internal combustion engine and internal combustion engine
DE102009044160A1 (en) 2008-10-02 2010-04-08 Avl List Gmbh Method for operating a spark-ignited internal combustion engine
DE102008042615B4 (en) 2008-10-06 2023-09-21 Robert Bosch Gmbh Method for introducing fuel into a combustion chamber of an internal combustion engine
DE102011121100B4 (en) * 2011-12-14 2017-10-12 Audi Ag A method of operating an internal combustion engine with a fuel injection system having at least two injectors
DE102011121100A1 (en) * 2011-12-14 2013-06-20 Audi Ag Method for operating internal combustion engine e.g. gasoline engine of motor car, involves injecting second partial quantity of fuel based on cooling effect of amount of air supplied to suction tube
DE102016224919B4 (en) 2015-12-16 2018-09-27 Robert Bosch Gmbh Fuel injection system, fuel injection control device and method
US9920705B2 (en) 2015-12-16 2018-03-20 Robert Bosch, Llc Fuel injection system and method
DE102018002165A1 (en) 2018-03-16 2019-09-19 Daimler Ag Internal combustion engine for a motor vehicle
DE102018002164A1 (en) 2018-03-16 2019-09-19 Daimler Ag Internal combustion engine for a motor vehicle, in particular for motor vehicles

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