DE4140071A1 - Air-compressing fuel injection engine using methanol - has small pilot fuel volume injected shortly before main volume, while ignition assistance device is active - Google Patents

Air-compressing fuel injection engine using methanol - has small pilot fuel volume injected shortly before main volume, while ignition assistance device is active

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Publication number
DE4140071A1
DE4140071A1 DE4140071A DE4140071A DE4140071A1 DE 4140071 A1 DE4140071 A1 DE 4140071A1 DE 4140071 A DE4140071 A DE 4140071A DE 4140071 A DE4140071 A DE 4140071A DE 4140071 A1 DE4140071 A1 DE 4140071A1
Authority
DE
Germany
Prior art keywords
injection
methanol
ignition
fuel
internal combustion
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
DE4140071A
Other languages
German (de)
Inventor
Michael Dr.-Ing. 7311 Notzingen De Kraemer
Joachim Dr.-Ing. 7151 Allmersbach De Schommers
Egbert Dipl.-Ing. 7312 Kirchheim De Willig
Wilhelm Dipl.-Ing. 7000 Stuttgart De Mueller
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.)
Daimler Benz AG
Original Assignee
Mercedes Benz 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 Mercedes Benz AG filed Critical Mercedes Benz AG
Priority to DE4140071A priority Critical patent/DE4140071A1/en
Publication of DE4140071A1 publication Critical patent/DE4140071A1/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
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/12—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having means for strengthening spark during starting
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
    • 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
    • F02B3/10—Engines characterised by air compression and subsequent fuel addition with compression ignition with intermittent fuel introduction
    • F02B3/12—Methods of operating
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/045—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the combustion chamber
    • 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
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0654—Thermal treatments, e.g. with heating elements or local cooling
    • F02B23/0657—Thermal treatments, e.g. with heating elements or local cooling the spray interacting with one or more glow plugs
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B23/101—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts
    • 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
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/001—Arrangements thereof
    • 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 engine has a nozzle for injection of fuel, which is resistant to auto-ignition, esp. methanol, into a combustion chamber. It also has a device for ignition assistance, to ignite the methanol. A small pilot volume injection of fuel into the combustion chamber (3), takes place shortly before the main volume is injected, and while the ignition assistance device is active. The device consists of an electrical spark plug, which is active only for the pilot volume. It may consist of a heater plug (9), and the injected pilot volume jet touches it tangentially. USE/ADVANTAGE - Air-compressing fuel injection engine running on methanol gives stability of combustion, esp. at low RPM/load, and reduced energy requirements for ignition.

Description

Die Erfindung betrifft eine luftverdichtende Einspritzbrenn­ kraftmaschine mit einer Einspritzdüse zur direkten Einspritzung von selbstzündungsunwilligem Kraftstoff, insbesondere Methanol, nach den im Oberbegriff des Patentanspruchs 1 angegebenen Merkmalen.The invention relates to an air-compressing injection burner engine with an injection nozzle for direct injection of self-igniting fuel, especially methanol, according to the specified in the preamble of claim 1 Characteristics.

Die Maßnahme, eine serienmäßige luftverdichtende Einspritz­ brennkraftmaschine auf den Betrieb mit Methanol umzustellen, um die Abgasqualität von Straßenfahrzeugen weiter zu verbessern, ist allgemein bekannt. Da Methanol selbst nicht zündungsfähig ist, werden Zündstrahlverfahren eingesetzt (ATZ, Automobil­ technische Zeitschrift 81 (1979) 3, Seite 108). Über zwei Ein­ spritzanlagen wird Dieselkraftstoff und Methanol direkt in den Muldenbrennraum eingebracht, wobei beide Einspritzdüsen etwa zu gleicher Zeit zu spritzen beginnen, allerdings spritzt der Me­ thanolstrahl länger.The measure, a standard air-compression injection to convert the internal combustion engine to operation with methanol further improve the exhaust gas quality of road vehicles, is well known. Because methanol itself is not ignitable is, ignition blasting methods are used (ATZ, automobile technical journal 81 (1979) 3, page 108). About two one spraying equipment, diesel fuel and methanol is directly in the Trough combustion chamber introduced, with both injectors about start spraying at the same time, but the Me splashes thanol jet longer.

Eine Ausführung dieser Art ist mit erheblichem Aufwand verbun­ den, da der Einsatz zweier getrennter Einspritzsysteme sowie die Mitführung von zwei verschiedenen Kraftstoffen im Fahrzeug erforderlich ist.An execution of this type is associated with considerable effort that because the use of two separate injection systems as well carrying two different fuels in the vehicle is required.

Aus der MTZ Motortechnische Zeitschrift 42 (1981) 12, S. 495 ff ist ebenfalls der Einsatz eines alternativen Energieträgers bekannt. Als Alternativkraftstoff ist selbstzündungsunwilliges Äthanol oder Methanol angesprochen. Um diesen Kraftstoff trotz dessen Selbstzündungsunwilligkeit sicher entflammen zu können, ist neben einem möglichst hohen Verdichtungsverhältnis die Be­ nützung einer fremden Zündquelle in der Art einer Zündkerze notwendig.From MTZ Motortechnische Zeitschrift 42 (1981) 12, p. 495 ff is also the use of an alternative energy source  known. As an alternative fuel, auto-ignition is unwanted Ethanol or methanol addressed. To fuel this despite to be able to ignite his unwillingness to ignite safely, besides the highest possible compression ratio, the Be use of an external ignition source in the manner of a spark plug necessary.

Der Erfindung liegt die Aufgabe zugrunde, an einer luftverdichtenden Einspritzbrennkraftmaschine mit selbstzündungsunwilligem Kraftstoffbetrieb einfache Maßnahmen durchzuführen, die neben einer Stabilität des Verbrennungsab­ laufes im gesamten Betriebsbereich, insbesondere bei niederer Drehzahl und/oder Last, auch eine Reduzierung der für die Entflammung des Kraftstoffes notwendigen Energiezufuhr zu er­ möglichen.The invention is based on the object air compressing injection engine with Simple measures to prevent self-ignition fuel operation perform, in addition to a stability of the combustion running in the entire operating area, especially in the low Speed and / or load, also a reduction for that Inflammation of the fuel necessary energy supply to it possible.

Zur Lösung der erfindungsgemäßen Aufgabe dienen die im Kenn­ zeichen des Patentanspruchs 1 angegebenen Merkmale.To solve the problem of the invention are used in the characteristic Character of claim 1 specified features.

Die besondere Maßnahme, vor der eigentlichen Haupteinspritz­ menge eine kleine Piloteinspritzmenge mit dazwischenliegender Einspritzunterbrechung in den Brennraum einzuspritzen und le­ diglich diese relativ kleine Piloteinspritzmenge durch eine Zündunterstützungseinrichtung zu entflammen, führt zu einer beträchtlichen Reduzierung der zuzuführenden elektrischen Energie und zu einer wesentlich verbesserten Zündwilligkeit des Alternativkraftstoffes.The special measure, before the actual main injection quantity a small pilot injection quantity with intermediate Injection interruption in the combustion chamber and le diglich this relatively small pilot injection quantity by a Igniting ignition support device leads to a considerable reduction in the electrical supply Energy and a significantly improved ignitability of the Alternative fuel.

Aus der DE-PS 2 48 406 ist eine für Verbrennungskraftmaschinen vorgesehene Vorrichtung zum Einführen von Kraftstoff bekannt, durch die zwar ein Teil des Kraftstoffes als Zündkraftstoff verwendet wird, durch die aber der Zündkraftstoff beim Öffnen des Einspritzventiles durch den Druck einer auf ihm lastenden Hilfsluftmenge in den Brennraum gespritzt wird. Erst beim weiteren Anheben der Nadel wird Treibstoff durch die Wirkung der vorgelagerten Einblaseluft in den Brennraum eingebracht. Bei Verwendung von selbstzündungsunwilligen Kraftstoffen ist jedoch eine dieselmotorische Verbrennung nicht sichergestellt.From DE-PS 2 48 406 is one for internal combustion engines provided device for introducing fuel is known, through which part of the fuel is used as ignition fuel is used, but by which the ignition fuel when opening of the injection valve by the pressure of a load on it Amount of auxiliary air is injected into the combustion chamber. Not until  Further lifting of the needle will fuel the effect the upstream blowing air is introduced into the combustion chamber. When using auto-igniting fuels however, diesel engine combustion is not ensured.

In den Unteransprüchen sind noch vorteilhafte Weiterbildungen der Erfindung angegeben.Advantageous further developments are in the subclaims specified the invention.

Der Gegenstand der Erfindung ist in der Zeichnung dargestellt und im folgenden näher erläutert. Es zeigen:The object of the invention is shown in the drawing and explained in more detail below. Show it:

Fig. 1 eine magnetventilgesteuerte Einspritzvorrichtung für eine Einspritzbrennkraftmaschine mit einem als Mulde im Kolben angeordneten Brennraum und Fig. 1 shows a solenoid-controlled injection device for an injection internal combustion engine with a combustion chamber arranged as a trough in the piston and

Fig. 2 eine Ansicht auf den Kolben mit Kraftstoffein­ spritzung und Glühkerze. Fig. 2 is a view of the piston with fuel injection and glow plug.

Der Kolben 1 einer luftverdichtenden Einspritzbrennkraftma­ schine 2 mit magnetventilgesteuerter Direkteinspritzung enthält einen als Mulde ausgebildeten Brennraum 3, in den von einer zentral im Zylinderkopf 4 angeordneten Mehrlochdüse 5 der Al­ ternativkraftstoff Methanol sternförmig eingespritzt wird. Die Mehrlochdüse 5 ist mit einer Pumpe 6 über eine Kurzleitung 7 unter Zwischenschaltung eines Magnetventiles 8 verbunden. Im Zylinderkopf 4 ist eine schräggestellte elektrische Glühkerze 9 angeordnet, die in den Randbereich der Mulde tief hineinragt, derart, daß ein Kraftstoffstrahl die Glühkerze 9 zumindest tangential streift (Fig. 2).The piston 1 of an air-compressing injection internal combustion engine 2 with solenoid-controlled direct injection contains a combustion chamber 3 in the form of a trough, into which a multi-hole nozzle 5 arranged centrally in the cylinder head 4 of the alternative fuel methanol is injected in a star shape. The multi-hole nozzle 5 is connected to a pump 6 via a short line 7 with the interposition of a solenoid valve 8 . In the cylinder head 4 , an inclined electrical glow plug 9 is arranged, which protrudes deep into the edge region of the trough, such that a fuel jet grazes the glow plug 9 at least tangentially ( FIG. 2).

Die Methanoleinspritzung ist hier so getroffen, daß zunächst eine kleine Piloteinspritzmenge und dann nach einer zeitlichen Einspritzunterbrechung die eigentliche Haupteinspritzmenge eingespritzt wird, wobei der Anteil der Piloteinspritzmenge bei etwa 5% liegt.The methanol injection is made here so that initially a small pilot injection amount and then after a time Injection interruption is the actual main injection quantity  is injected, the proportion of the pilot injection quantity at is about 5%.

Der seither unvermeidbare Nachteil, daß selbst bei zugeführten hohen elektrischen Energien die Zündsicherheit nicht immer ge­ währleistet ist, was unter anderem an der hohen Verdämpfungswärme des zündunwilligen Methanol liegt, welche die Temperatur im Brennraum während jeder Einspritzung beträchtlich verringert, ist durch Splitting der Einspritzung während jeden Einspritzvorganges beseitigt, da die Einspritzung einer kleinen Pilotmenge zu vergleichsweise geringer Temperatureinbuße und nach der Umsetzung zu deutlichen Temperaturerhöhungen des Brennraumes führt. In die auf diese Weise erhitzte Brennraum­ ladung wird die Haupteinspritzmenge mit dem Effekt deutlich verbesserter Zündwilligkeit eingespritzt.The disadvantage that has been unavoidable since then is that even with fed high electrical energies do not always guarantee ignition safety what is guaranteed is, among other things, the high Heat of vaporization of the non-ignitable methanol lies which the Temperature in the combustion chamber is considerable during each injection is reduced by splitting the injection during each Injection process eliminated because the injection of a small Pilot amount at comparatively low temperature loss and after the implementation to significant temperature increases of the Leads combustion chamber. In the combustion chamber heated in this way charge, the main injection quantity becomes clear with the effect injected fuel is injected.

Bei den aufeinanderfolgenden Einspritzungen ist die Glühkerze 9 stets eingeschaltet, deren Energiemenge in Abhängigkeit von Betriebsparametern der Brennkraftmaschine, wie Brennraumdruck, Temperatur, Drehungleichförmigkeit usw. geregelt werden kann. Die Einleitung der Haupteinspritzmenge erfolgt frühestens zu einem Zeitpunkt, wenn die Voreinspritzmenge beginnt zu brennen. Die Glühkerze 9 ist nur eingeschaltet, wenn hierzu eine Not­ wendigkeit besteht. Bei Verlassen des unteren Lastbereiches und bei Vorliegen von Mindesttemperaturen im Brennraum, die bereits zum Entflammen des Methanols ohne externe Zündhilfe ausreichen, ist die Glühkerze 9 unwirksam, d. h. ausgeschaltet. Neben der Abschaltung der Glühkerze ist gegebenenfalls bei hoher Last und/oder Drehzahl bei entsprechenden zündfähigen Brennraumtem­ peraturen auch die Piloteinspritzmenge abschaltbar.During the successive injections, the glow plug 9 is always switched on, the amount of energy of which can be regulated as a function of operating parameters of the internal combustion engine, such as combustion chamber pressure, temperature, rotational irregularity, etc. The main injection quantity is initiated at the earliest when the pilot injection quantity starts to burn. The glow plug 9 is only switched on when there is an emergency. When leaving the lower load range and when there are minimum temperatures in the combustion chamber which are sufficient to ignite the methanol without external ignition aid, the glow plug 9 is ineffective, ie switched off. In addition to switching off the glow plug, the pilot injection quantity can also be switched off at high load and / or speed with appropriate ignitable combustion chamber temperatures.

Bei Verwendung einer Zündkerze kann diese in gesteuerter Weise nur beim Einspritzen der Piloteinspritzmenge wirksam sein, aber auch ähnlich wie bei dem Einsatz einer Glühkerze nur so lange, wie hierzu eine Notwendigkeit besteht, d. h., daß mit Über­ schreiten des unteren Lastbereiches und definierter Brenn­ raummindesttemperatur die Zündkerze ausgeschaltet sein kann.When using a spark plug, this can be done in a controlled manner only be effective when injecting the pilot injection quantity, however  similar to the use of a glow plug only for as long how there is a need for this, d. that is, with About the lower load range and defined firing minimum room temperature the spark plug can be switched off.

Claims (7)

1. Luftverdichtende Einspritzbrennkraftmaschine mit einer Ein­ spritzdüse zur Einspritzung von selbstzündungsunwilligem Kraftstoff, insbesondere Methanol, in einen Brennraum und mit einer Zündunterstützungseinrichtung zur Entflammung des zünd­ unwilligen Kraftstoffes, dadurch gekennzeichnet, daß zur Einspritzung des zündunwilligen Kraftstoffes vor einer Haupteinspritzmenge eine von dieser zeitlich getrennte kleine Piloteinspritzmenge bei wirksamer Zündunterstützungseinrichtung in den Brennraum (3) eingebracht wird.1. Air-compressing injection internal combustion engine with an injection nozzle for injecting self-igniting fuel, in particular methanol, into a combustion chamber and with an ignition support device for igniting the unwanted fuel, characterized in that for the injection of the unwanted fuel before a main injection quantity, a small pilot injection quantity separated from this is introduced into the combustion chamber ( 3 ) with an effective ignition support device. 2. Einspritzbrennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Zündunterstützungseinrichtung aus einer elektrischen Zündkerze besteht, die nur für die in den Brennraum einge­ brachte Piloteinspritzmenge wirksam ist.2. injection internal combustion engine according to claim 1, characterized, that the ignition support device from an electrical Spark plug exists, which is only used in the combustion chamber brought pilot injection quantity is effective. 3. Einspritzbrennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Zündunterstützungseinrichtung aus einer elektrischen Glühkerze (9) besteht. 3. Injection internal combustion engine according to claim 1, characterized in that the ignition support device consists of an electric glow plug ( 9 ). 4. Einspritzbrennkraftmaschine nach Anspruch 3, dadurch gekennzeichnet, daß ein Strahl der Piloteinspritzmenge die Glühkerze (9) zu­ mindest tangential streift.4. Injection internal combustion engine according to claim 3, characterized in that a jet of the pilot injection quantity touches the glow plug ( 9 ) at least tangentially. 5. Einspritzbrennkraftmaschine nach Anspruch 4, dadurch gekennzeichnet, daß die Glühkerze (9) lediglich im unteren Lastbereich wirksam ist.5. Injection internal combustion engine according to claim 4, characterized in that the glow plug ( 9 ) is effective only in the lower load range. 6. Einspritzbrennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Piloteinspritzmenge bei hoher Last und/oder Drehzahl abschaltbar ist.6. Injection internal combustion engine according to one of the preceding Expectations, characterized, that the pilot injection quantity at high load and / or speed can be switched off. 7. Einspritzbrennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Anteil der Piloteinspritzmenge bezogen auf die Gesamt­ einspritzmenge zwischen 2% und 25% beträgt.7. Injection internal combustion engine according to one of the preceding Expectations, characterized, that the proportion of the pilot injection quantity based on the total injection quantity is between 2% and 25%.
DE4140071A 1991-12-05 1991-12-05 Air-compressing fuel injection engine using methanol - has small pilot fuel volume injected shortly before main volume, while ignition assistance device is active Ceased DE4140071A1 (en)

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CN102425483A (en) * 2011-11-04 2012-04-25 天津理工大学 Method for improving natural gas engine compression ignition performance by adopting oxidizer

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