EP0947692B1 - Start-aiding system for compression ignition type engine - Google Patents

Start-aiding system for compression ignition type engine Download PDF

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Publication number
EP0947692B1
EP0947692B1 EP99106964A EP99106964A EP0947692B1 EP 0947692 B1 EP0947692 B1 EP 0947692B1 EP 99106964 A EP99106964 A EP 99106964A EP 99106964 A EP99106964 A EP 99106964A EP 0947692 B1 EP0947692 B1 EP 0947692B1
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EP
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Prior art keywords
valve
fuel
valve body
internal combustion
combustion engine
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EP99106964A
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German (de)
French (fr)
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EP0947692A1 (en
Inventor
Frank Lantermann
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Deutz AG
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Deutz AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00Starting aids for combustion engines, not otherwise provided for
    • F02N19/02Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F02N19/06Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of combustion-air by flame generating means, e.g. flame glow-plugs

Definitions

  • the invention relates to a self-igniting internal combustion engine a crankcase in which a crankshaft is rotatably supported, to which at least one connecting rod carrying a piston is articulated, the piston being formed in one of a cylinder head a cylinder covered work space is movable and the work space fuel delivered by an injection pump via a Injection line and an injection valve as well as an intake air system Combustion air can be supplied, the intake air system Preheater, consisting of a flame glow plug with a assigned constant throttle and a metering device, the additional to the assigned constant throttle without fuel return turned on in the fuel supply line to the flame glow plug is.
  • Such an internal combustion engine is known from EP 08 16 673 A1.
  • a metering device is in the fuel supply line to the flame glow plug, which is designed as a solenoid valve.
  • This solenoid valve is made by controlled an elaborate control unit in the form that the the amount of fuel to be supplied to the flame glow plug by a corresponding Clocking is set or dosed.
  • This control is prone to failure on the one hand, and on the other hand is subject to the solenoid valve because of the constant opening and closing of one insignificant wear.
  • the invention has for its object such a system further training, so that this system in all operating states the internal combustion engine works reliably.
  • the metering device is a pressure regulating shut-off valve
  • the shut-off valve is designed as an on / off solenoid valve
  • the solenoid-operated Interacting valve body after its release with a valve body the self-regulating pressure regulating valve in the form that the valve body forms one with a fuel supply opening constriction interacting in the valve body which, in turn, has a constriction in the valve body with the valve body seat that has a fuel discharge opening to the fuel supply line, in Flow connection is established.
  • This training puts the knowledge based on that for reliable operation of the preheater This one is related to time in the respective operating states constant amount of fuel must be supplied. However, this means that the fuel pressure must be constant.
  • a valve body is in the valve body with a valve body seat surface against a compression spring a valve seat pressable and by a solenoid valve in this position is noticeable.
  • This is a simple design with this Pressure regulating shut-off valve first a conventional shut-off valve created to turn off the preheater is needed.
  • This solenoid valve is a simple on / off solenoid valve trained so that none of its functional scope big demands are made.
  • the injection system is a High-pressure injection system, the rest with caseless single injection pump elements can be equipped. These single injection pump elements are directly in the crankcase Internal combustion engine used and with short injection lines connected to the injectors. Especially in such a system is the system pressure during the starting phase of the internal combustion engine, which is built up by a fuel feed pump, strong fluctuating, the pressure fluctuations being of the order of magnitude of approx. 5 bar (1 bar system pressure during the start phase and 6 bar System pressure during the normal operating phase).
  • the high pressure injection system of a self-igniting internal combustion engine is according to the embodiment for a four-cylinder Engine designed.
  • a fuel feed pump 1 sucks the fuel from a fuel tank 2 and promotes this a fuel filter 3 via a fuel supply line 4a four single injection pump elements 5, which are housed in the crankcase the internal combustion engine are used.
  • the fuel supply line 4a is also in the crankcase integrated.
  • the single injection pump elements 5 are via short injection lines 6 connected to injectors 7, which in the Cylinder head (part) assigned to each cylinder or work area the internal combustion engine are used and that of the single injection pump elements 5 delivered fuel into the work area inject.
  • Each of the injection valves 7 has a leakage oil line 8 connected, which open into a common manifold 9.
  • This manifold 9 in turn opens into the fuel tank 2. Furthermore, an overflow line opens into the collecting line 9 10, the continuation of the fuel supply line 4a behind represents the last single injection pump 5 and in the overflow line a throttle 11 and, in parallel, an overflow valve 12 are switched on.
  • the throttle 11 ensures that the fuel supply line 4a always from a small amount of fuel is flowed through, so that, for example, a uniform temperature prevails in the entire fuel supply line 4a.
  • the throttle 11 ensures a counter-pressure fuel system at the start of the internal combustion engine. This is an improved one Suction of the fuel pump 1 allows. conditioned the high-pressure injection system prevails in the fuel supply line 4a is a fuel pressure that depends on the operating state the internal combustion engine in the range from approx. 1 bar to approx. 6 bar fluctuates.
  • the flame glow plug 14 is on the air inlet side in the Intake air system of the internal combustion engine is used and serves in particular when the engine is cold started as a preheating device for the combustion air to be supplied to the combustion chambers. Doing so the preheating device until a predeterminable operating temperature is reached the internal combustion engine operated.
  • the Flame glow plug 14 consists essentially of one Glow plug in a mixing chamber for mixing fuel and air is used. The fuel is transferred to this mixing chamber a constant choke integrated into the flame glow plug 14 from the Fuel supply line 4b is supplied while the air is the intake air system is removed.
  • the pressure regulating shut-off valve 13 has the following according to FIG. 2 Structure on:
  • a valve body 15 has a cylindrical recess in which a valve body 16 is movably inserted.
  • the Valve body 16 has a valve body seat surface 17, which by a Compression spring 18 which engages the valve body 16 against a valve seat 19 is pressed.
  • the fuel flow is from a fuel supply opening 20 to a fuel discharge opening 21, which in the Fuel supply line 4b are turned on, interrupted.
  • On the valve body 16 does not engage via an actuating element 22 shown solenoid valve, which the valve body 16 in the illustrated Determines position or releases.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)

Abstract

The diesel engine has a flame glow plug and a dosing device for preheating the air intake by combustion of fuel. The dosing device has a pressure-regulating blocking valve (13) inserted in the fuel supply line to the flame glow plug, without using a fuel feedback line. An Independent claim for a method of operating a preheating device for the air intake for a diesel engine is also included.

Description

Die Erfindung betrifft eine selbstzündende Brennkraftmaschine mit einem Kurbelgehäuse, in dem eine Kurbelwelle drehbar gelagert ist, an der zumindest ein einen Kolben tragendes Pleuel angelenkt ist, wobei der Kolben in einem von einem Zylinderkopf unter Bildung eines Arbeitsraums abgedeckten Zylinder bewegbar ist und dem Arbeitsraum von einer Einspritzpumpe geförderter Kraftstoff über eine Einspritzleitung und ein Einspritzventil sowie über ein Ansaugluftsystem Brennluft zuführbar sind, wobei das Ansaugluftsystem eine Vorwärmeinrichtung, bestehend aus einer Flammglühkerze mit einer zugeordneten Konstantdrossel und einer Dosiereinrichtung, die zusätzlich zu der zugeordneten Konstantdrossel kraftstoffrückleitungslos in die Kraftstoffversorgungsleitung zu der Flammglühkerze eingeschaltet ist, aufweist.The invention relates to a self-igniting internal combustion engine a crankcase in which a crankshaft is rotatably supported, to which at least one connecting rod carrying a piston is articulated, the piston being formed in one of a cylinder head a cylinder covered work space is movable and the work space fuel delivered by an injection pump via a Injection line and an injection valve as well as an intake air system Combustion air can be supplied, the intake air system Preheater, consisting of a flame glow plug with a assigned constant throttle and a metering device, the additional to the assigned constant throttle without fuel return turned on in the fuel supply line to the flame glow plug is.

Eine derartige Brennkraftmaschine ist aus der EP 08 16 673 A1 bekannt. Bei dieser Brennkraftmaschine ist eine Dosiereinrichtung in der Kraftstoffversorgungsleitung zu der Flammglühkerze eingesetzt, die als Magnetventil ausgebildet ist. Dieses Magnetventil wird von einem aufwendigen Steuergerät in der Form angesteuert, dass die der Flammglühkerze zuzuführende Kraftstoffmenge durch eine entsprechende Taktung eingestellt bzw. dosiert wird. Diese Steuerung ist einerseits störanfällig, andererseits unterliegt das Magnetventil durch das dauernde vollständige Öffnen und Schließen einem nicht unerheblichen Verschleiß. Such an internal combustion engine is known from EP 08 16 673 A1. In this internal combustion engine, a metering device is in the fuel supply line to the flame glow plug, which is designed as a solenoid valve. This solenoid valve is made by controlled an elaborate control unit in the form that the the amount of fuel to be supplied to the flame glow plug by a corresponding Clocking is set or dosed. This control is prone to failure on the one hand, and on the other hand is subject to the solenoid valve because of the constant opening and closing of one insignificant wear.

Der Erfindung liegt die Aufgabe zugrunde, ein derartiges System weiterzubilden, so dass dieses System bei allen Betriebszuständen der Brennkraftmaschine zuverlässig arbeitet.The invention has for its object such a system further training, so that this system in all operating states the internal combustion engine works reliably.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Dosiereinrichtung ein Druckregulier-Absperrventil ist, wobei das Absperrventil als Ein-/Aus-Magnetventil ausgebildet ist, dessen magnetbetätigter Ventilkörper nach dessen Freigabe zusammenwirkend mit einem Ventilgrundkörper das selbstregulierende Druckregulierventil in der Form bildet, dass der Ventilkörper eine mit einer Kraftstoffzuführöffnung in dem Ventilgrundkörper zusammenwirkende Einschnürung aufweist, die ihrerseits über eine Gegeneinschnürung in dem Ventilgrundkörper mit der Ventilkörpersitzfläche, die eine Kraftstoffabgabeöffnung zu der Kraftstoffversorgungsleitung beherrscht, in Strömungsverbindung steht. Dieser Ausbildung legt die Erkenntnis zugrunde, dass für einen zuverlässigen Betrieb der Vorwärmeinrichtung dieser bei den jeweiligen Betriebszuständen eine zeitlich bezogen möglichst konstante Kraftstoffmenge zugeführt werden muss. Das heißt aber, dass der Kraftstoffdruck konstant sein muss. Insbesondere beim Startvorgang einer Brennkraftmaschine ist aber der Systemdruck in dem Kraftstoffsystem zu der Einspritzeinrichtung, von dem bekanntermaßen der Kraftstoff für die Vorwärmeinrichtung entnommen wird, abweichend von dem späteren Betriebsdruck. Durch das Druckregulier-Absperrventil und die Konstantdrossel wird der Kraftstoffdruck vor der Flammglühkerze auf einen angenähert konstanten Wert gehalten, so dass ein sicherer und störungsfreier Betrieb der Brennkraftmaschine sichergestellt ist. Dies wirkt sich positiv für den gesamten Betrieb einschließlich der Abgasemissionen der Brennkraftmaschine aus. Dabei ist von besonderem Vorteil, dass die erfindungsgemäße Ausgestaltung kraftstoffrückleitungslos ausgestaltet ist und somit die Verlegung von Leitungen in diesem Bereich der Brennkraftmaschine auf das technisch mögliche Minimum beschränkt ist. Dies hat weitere Vorteile bezüglich des Montageaufwands, der Betriebssicherheit und auch des äußeren Erscheinungsbildes der Brennkraftmaschine. Weiterhin ist durch die angegebene konstruktive Ausgestaltung in Verbindung mit der Konstantdrossel die selbstregulierende Kraftstoffdruckeinstellung ermöglicht, indem nach dem Start des Systems durch Freigabe des Ventilkörpers zunächst aufgrund des Kraftstoffdrucks in der Kraftstoffzuführöffnung der Ventilkörper von dem Ventilsitz abhebt. Somit fließt der Kraftstoff zur Flammglühkerze. Beim weiteren Hochlauf der Brennkraftmaschine steigt der Kraftstoffdruck, bis der Ventilkörper mit einer Steuerkante den Kraftstofffluss unterbricht. Der Druck vor der Flammglühkerze wird nun über die Konstantdrossel abgebaut, bis das Druckregulier-Absperrventil wieder öffnet. Folglich wird Kraftstoff nachgefördert, so dass der Druck vor der Flammglühkerze wieder ansteigt, bis die Steuerkante die Nachförderung erneut unterbricht. Dadurch wird aber der Kraftstoffdruck hinter der Konstantdrossel auf einem konstanten Niveau gehalten.This object is achieved in that the metering device is a pressure regulating shut-off valve, the shut-off valve is designed as an on / off solenoid valve, the solenoid-operated Interacting valve body after its release with a valve body the self-regulating pressure regulating valve in the form that the valve body forms one with a fuel supply opening constriction interacting in the valve body which, in turn, has a constriction in the valve body with the valve body seat that has a fuel discharge opening to the fuel supply line, in Flow connection is established. This training puts the knowledge based on that for reliable operation of the preheater This one is related to time in the respective operating states constant amount of fuel must be supplied. However, this means that the fuel pressure must be constant. In particular when starting an internal combustion engine is the System pressure in the fuel system to the injector, from known to take the fuel for the preheater will differ from the later operating pressure. By the pressure regulating shut-off valve and the constant throttle become the Fuel pressure in front of the flame glow plug to an approximately constant Value kept so that safe and trouble-free operation the internal combustion engine is ensured. This has a positive effect for the entire operation including the exhaust emissions of the Internal combustion engine. It is particularly advantageous that the Design according to the invention designed without fuel return and therefore the laying of cables in this area the internal combustion engine is limited to the technically possible minimum is. This has further advantages in terms of assembly effort, operational safety and also the external appearance the internal combustion engine. Furthermore is indicated by the constructive design in connection with the constant throttle allows the self-regulating fuel pressure setting by after starting the system by releasing the valve body first due to the fuel pressure in the fuel supply opening the valve body lifts off the valve seat. The fuel therefore flows to the flame glow plug. When the internal combustion engine starts up again the fuel pressure rises until the valve body with a control edge interrupts the fuel flow. The pressure in front of the flame glow plug is now reduced via the constant throttle until the Pressure regulating shut-off valve opens again. Consequently, fuel conveyed so that the pressure in front of the flame glow plug rises again, until the control edge interrupts the re-feeding. Thereby but the fuel pressure behind the constant throttle on one kept constant.

In Weiterbildung der Erfindung ist in dem Ventilgrundkörper ein Ventilkörper mit einer Ventilkörpersitzfläche von einer Druckfeder gegen einen Ventilsitz pressbar und von einem Magnetventil in dieser Stellung feststellbar ist. Dadurch ist in einfacher Ausgestaltung mit diesem Druckregulier-Absperrventil zunächst ein konventionelles Absperrventil geschaffen, das zum Abstellen der Vorwärmeinrichtung benötigt wird. Dabei ist dieses Magnetventil als einfaches Ein-/Aus-Magnetventil ausgebildet, so dass an dessen Funktionsumfang keine großen Anforderungen gestellt sind.In a development of the invention, a valve body is in the valve body with a valve body seat surface against a compression spring a valve seat pressable and by a solenoid valve in this position is noticeable. This is a simple design with this Pressure regulating shut-off valve first a conventional shut-off valve created to turn off the preheater is needed. This solenoid valve is a simple on / off solenoid valve trained so that none of its functional scope big demands are made.

In weiterer Ausgestaltung der Erfindung ist das Einspritzsystem ein Hochdruck-Einspritzsystem, das im übrigen mit gehäuselosen Einzeleinspritzpumpenelementen ausgestattet sein kann. Diese Einzeleinspritzpumpenelemente sind direkt in das Kurbelgehäuse der Brennkraftmaschine eingesetzt und über kurze Einspritzleitungen mit den Einspritzventilen verbunden. Gerade in einem derartigen System ist während der Startphase der Brennkraftmaschine der Systemdruck, der von einer Kraftstoffförderpumpe aufgebaut wird, stark schwankend, wobei die Druckschwankungen in der Größenordnung von ca. 5 bar (1 bar Systemdruck während der Startphase und 6 bar Systemdruck während der normalen Betriebsphase) liegen können.In a further embodiment of the invention, the injection system is a High-pressure injection system, the rest with caseless single injection pump elements can be equipped. These single injection pump elements are directly in the crankcase Internal combustion engine used and with short injection lines connected to the injectors. Especially in such a system is the system pressure during the starting phase of the internal combustion engine, which is built up by a fuel feed pump, strong fluctuating, the pressure fluctuations being of the order of magnitude of approx. 5 bar (1 bar system pressure during the start phase and 6 bar System pressure during the normal operating phase).

Vorteilhafte Weiterbildungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Advantageous developments of the invention are the description of the drawing can be seen in which a shown in the figures Embodiment of the invention is described in more detail.

Es zeigen:

Fig. 1:
ein Gesamtschaltschema des Kraftstoffversorgungssystems für die Einspritzvorrichtung und die Vorwärmeinrichtung und
Fig. 2:
einen Schnitt durch das Druckregulier-Absperrventil.
Show it:
Fig. 1:
an overall circuit diagram of the fuel supply system for the injector and the preheater and
Fig. 2:
a section through the pressure regulating shut-off valve.

Das Hochdruck-Einspritzsystem einer selbstzündenden Brennkraftmaschine ist gemäß dem Ausführungsbeispiel für eine vierzylindrige Brennkraftmaschine ausgelegt. Eine Kraftstofförderpumpe 1 saugt den Kraftstoff aus einem Kraftstofftank 2 an und fördert diesen durch einen Kraftstoffilter 3 über eine Kraftstoffversorgungsleitung 4a zu vier Einzeleinspritzpumpenelementen 5, die gehäuselos in das Kurbelgehäuse der Brennkraftmaschine eingesetzt sind. Die Kraftstoffversorgungsleitung 4a ist im übrigen ebenfalls in das Kurbelgehäuse integriert. Die Einzeleinspritzpumpenelemente 5 sind über kurze Einspritzleitungen 6 mit Einspritzventilen 7 verbunden, die in dem dem jeweiligen Zylinder bzw. Arbeitsraum zugeordneten Zylinderkopf-(teil) der Brennkraftmaschine eingesetzt sind und die den von den Einzeleinspritzpumpenelementen 5 geförderten Kraftstoff in den Arbeitsraum einspritzen. Jedes der Einspritzventile 7 ist mit einer Leckölleitung 8 verbunden, die in eine gemeinsame Sammelleitung 9 einmünden. Diese Sammelleitung 9 mündet wiederum in den Kraftstofftank 2. Weiterhin mündet in die Sammelleitung 9 eine Überströmleitung 10, die die Weiterführung der Kraftstoffversorgungsleitung 4a hinter der letzten Einzeleinspritzpumpe 5 darstellt und wobei in die Überströmleitung eine Drossel 11 sowie parallel dazu ein Überströmventil 12 eingeschaltet sind. Die Drossel 11 gewährleistet, daß die Kraftstoffversorgungsleitung 4a immer von einer kleinen Kraftstoffmenge durchströmt wird, so daß beispielsweise eine gleichmäßige Temperatur in der gesamten Kraftstoffversorgungsleitung 4a herrscht. Insbesondere sorgt die Drossel 11 für ein gegendruckloses Kraftstoffsystem beim Start der Brennkraftmaschine. Dadurch ist ein verbessertes Ansaugen der Kraftstofförderpumpe 1 ermöglicht. Bedingt durch das Hochdruck-Einspritzsystem herrscht in der Kraftstoffversorgungsleitung 4a ein Kraftstoffdruck, der je nach Betriebszustand der Brennkraftmaschine im Bereich von ca. 1 bar bis ca. 6 bar schwankt. The high pressure injection system of a self-igniting internal combustion engine is according to the embodiment for a four-cylinder Engine designed. A fuel feed pump 1 sucks the fuel from a fuel tank 2 and promotes this a fuel filter 3 via a fuel supply line 4a four single injection pump elements 5, which are housed in the crankcase the internal combustion engine are used. The fuel supply line 4a is also in the crankcase integrated. The single injection pump elements 5 are via short injection lines 6 connected to injectors 7, which in the Cylinder head (part) assigned to each cylinder or work area the internal combustion engine are used and that of the single injection pump elements 5 delivered fuel into the work area inject. Each of the injection valves 7 has a leakage oil line 8 connected, which open into a common manifold 9. This manifold 9 in turn opens into the fuel tank 2. Furthermore, an overflow line opens into the collecting line 9 10, the continuation of the fuel supply line 4a behind represents the last single injection pump 5 and in the overflow line a throttle 11 and, in parallel, an overflow valve 12 are switched on. The throttle 11 ensures that the fuel supply line 4a always from a small amount of fuel is flowed through, so that, for example, a uniform temperature prevails in the entire fuel supply line 4a. In particular The throttle 11 ensures a counter-pressure fuel system at the start of the internal combustion engine. This is an improved one Suction of the fuel pump 1 allows. conditioned the high-pressure injection system prevails in the fuel supply line 4a is a fuel pressure that depends on the operating state the internal combustion engine in the range from approx. 1 bar to approx. 6 bar fluctuates.

Von der Kraftstoffversorgungsleitung 4a zweigt hinter dem Kraftstoffilter 3 die Kraftstoffversorgungsleitung 4b ab, wobei diese über ein Druckregulier-Absperrventil 13 mit einer Flammglühkerze 14 verbunden ist. Die Flammglühkerze 14 ist auf der Lufteintrittsseite in das Ansaugluftsystem der Brennkraftmaschine eingesetzt und dient insbesondere beim Kaltstart der Brennkraftmaschine als Vorwärmeinrichtung für die den Brennräumen zuzuführende Brennluft. Dabei wird die Vorwärmeinrichtung bis zum Erreichen einer vorgebbaren Betriebstemperatur der Brennkraftmaschine betrieben. Die Flammglühkerze 14 besteht im übrigen im wesentlichen aus einem Glühstift, der in einer Mischkammer zur Vermischung von Kraftstoff und Luft eingesetzt ist. Der Kraftstoff wird dieser Mischkammer über eine in die Flammglühkerze 14 integrierte Konstantdrossel von der Kraftstoffversorgungsleitung 4b zugeführt, während die Luft dem Ansaugluftsystem entnommen wird.From the fuel supply line 4a branches behind the fuel filter 3 from the fuel supply line 4b, this over a pressure regulating shut-off valve 13 is connected to a flame glow plug 14 is. The flame glow plug 14 is on the air inlet side in the Intake air system of the internal combustion engine is used and serves in particular when the engine is cold started as a preheating device for the combustion air to be supplied to the combustion chambers. Doing so the preheating device until a predeterminable operating temperature is reached the internal combustion engine operated. The Flame glow plug 14 consists essentially of one Glow plug in a mixing chamber for mixing fuel and air is used. The fuel is transferred to this mixing chamber a constant choke integrated into the flame glow plug 14 from the Fuel supply line 4b is supplied while the air is the intake air system is removed.

Das Druckregulier-Absperrventil 13 weist gemäß Fig. 2 folgenden Aufbau auf: Ein Ventilgrundkörper 15 weist eine zylindrische Ausnehmung auf, in die ein Ventilkörper 16 bewegbar eingesetzt ist. Der Ventilkörper 16 weist eine Ventilkörpersitzfläche 17 auf, die von einer Druckfeder 18, die an den Ventilkörper 16 angreift, gegen einen Ventilsitz 19 gedrückt wird. Dadurch ist der Kraftstofffluß von einer Kraftstoffzuführöffnung 20 zu einer Kraftstoffabgabeöffnung 21, die in die Kraftstoffversorgungsleitung 4b eingeschaltet sind, unterbrochen. An den Ventilkörper 16 greift über ein Betätigungselement 22 ein nicht dargestelltes Magnetventil an, das den Ventilkörper 16 in der dargestellten Position feststellt oder aber freigibt. Ist der Ventilkörper 16 freigegeben, kann er gegen die Druckfeder 18 von dem Ventilsitz 19 abheben und den Kraftstofffluß von der Kraftstoffzuführöffnung 20 zu der Kraftstoffabgabeöffnung 21 freigeben. Dies geschieht in der Art, daß der Kraftstoff von der Kraftstoffzuführöffnung 20 über eine Einschnürung 23 in dem Ventilkörper 16 zu einer Gegeneinschnürung 24 in dem Ventilgrundkörper 15 geleitet wird. Der so geführte Kraftstoff übt eine Kraft auf den Ringbereich 25 der Ventilkörpersitzfläche 17 aus, so daß diese von dem Ventilsitz 19 abhebt. Wenn der Ventilkörper 16 von dem Ventilsitz 19 genügend weit abgehoben hat, beendet eine Steuerkante 26 zusammenwirkend mit einer Steuerkante 26a an dem Ventilgrundkörper 15 den weiteren Kraftstofffluß zu der Kraftstoffabgabeöffnung 21. Zusammen mit der Konstantdrossel in der Flammglühkerze 14 ist dieses System so abgestimmt, daß dadurch ein konstanter Druck beispielsweise von 0,8 bar eingestellt wird, unter dem Kraftstoff der Mischkammer der Flammglühkerze zugeführt wird.The pressure regulating shut-off valve 13 has the following according to FIG. 2 Structure on: A valve body 15 has a cylindrical recess in which a valve body 16 is movably inserted. The Valve body 16 has a valve body seat surface 17, which by a Compression spring 18 which engages the valve body 16 against a valve seat 19 is pressed. As a result, the fuel flow is from a fuel supply opening 20 to a fuel discharge opening 21, which in the Fuel supply line 4b are turned on, interrupted. On the valve body 16 does not engage via an actuating element 22 shown solenoid valve, which the valve body 16 in the illustrated Determines position or releases. Is the valve body 16 released, he can against the compression spring 18 from the valve seat 19th lift off and the fuel flow from the fuel supply opening 20 to the fuel discharge opening 21. This happens in the way that the fuel from the fuel supply opening 20 via a constriction 23 in the valve body 16 to a constriction 24 is passed in the valve body 15. The fuel run in this way exerts a force on the ring region 25 of the valve body seat surface 17 so that it lifts off the valve seat 19. If the valve body 16 has lifted sufficiently far from the valve seat 19 a control edge 26 cooperating with a control edge 26a the valve body 15 the further fuel flow to the fuel discharge opening 21. Together with the constant throttle in the Flame glow plug 14, this system is tuned so that a constant pressure of, for example, 0.8 bar is set, fed under the fuel of the mixing chamber of the flame glow plug becomes.

Claims (3)

  1. Auto-ignition internal combustion engine, with a crank case, in which is mounted rotatably a crankshaft on which at least one connecting rod carrying a piston is articulated, the piston being movable in a cylinder, covered by a cylinder head so as to form a working space, and fuel conveyed by an injection pump (5) being capable of being supplied to the working space via an injection line (6) and an injection valve (7) and combustion air being capable of being supplied to the said working space via an intake-air system, the intake-air system having a preheating device consisting of a flame-type heater plug (14) with an assigned constant throttle and of a metering device which, in addition to the assigned constant throttle, is connected, without fuel return, into the fuel supply line (4b) to the flame-type heater plug (14), characterized in that the metering device is a pressure-regulating shut-off valve (13), the shut-off valve being designed as an on/off solenoid valve, the magnet-actuated valve body (16) of which, after its release, constitutes, in cooperation with a basic valve body (15), the self-regulating pressure-regulating valve, in a form such that the valve body (16) has a contraction (23) which cooperates with a fuel supply orifice (20) in the basic valve body (15) and which is itself flow-connected, via a countercontraction (24) in the basic valve body (15), to a valve-body seat surface (17) which controls a fuel discharge orifice (21) to the fuel supply line (4b).
  2. Auto-ignition internal combustion engine according to Claim 1, characterized in that, in the basic valve body (15), a valve body (16) can be pressed with a valve-body seat surface (17) against the valve seat (19) by a compression spring (18) and can be fixed in this position by a solenoid valve.
  3. Auto-ignition internal combustion engine according to one of the preceding claims, characterized in that the injection system is a high-pressure injection system.
EP99106964A 1998-04-03 1999-03-31 Start-aiding system for compression ignition type engine Expired - Lifetime EP0947692B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19815042A DE19815042A1 (en) 1998-04-03 1998-04-03 Jump start system for a self-igniting internal combustion engine
DE19815042 1998-04-03

Publications (2)

Publication Number Publication Date
EP0947692A1 EP0947692A1 (en) 1999-10-06
EP0947692B1 true EP0947692B1 (en) 2004-09-29

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Application Number Title Priority Date Filing Date
EP99106964A Expired - Lifetime EP0947692B1 (en) 1998-04-03 1999-03-31 Start-aiding system for compression ignition type engine

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EP (1) EP0947692B1 (en)
AT (1) ATE278103T1 (en)
DE (2) DE19815042A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10335016B4 (en) * 2003-07-31 2012-11-29 Robert Bosch Gmbh Method for starting a multi-cylinder internal combustion engine
DE102020002684A1 (en) 2020-05-05 2021-11-11 Felix Schiefer Injection nozzle and device for loading a fuel with gas
DE202020001914U1 (en) 2020-05-05 2020-06-15 Hartmut Schiefer Injection nozzle and device for loading a fuel with gas

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2324841A1 (en) * 1973-05-17 1974-12-12 Bosch Gmbh Robert FLAME STARTING SYSTEM FOR COMBUSTION MACHINERY
DE4032758A1 (en) * 1990-10-16 1992-04-30 Daimler Benz Ag Intake air heater for IC engine flame starting - supplies metered fuel vol., controlled by detected engine operating parameters
DE19629928A1 (en) * 1996-07-24 1998-01-29 Beru Werk Ruprecht Gmbh Co A Method for operating a flame start system for an internal combustion engine and flame start system for an internal combustion engine

Also Published As

Publication number Publication date
ATE278103T1 (en) 2004-10-15
DE59910618D1 (en) 2004-11-04
DE19815042A1 (en) 1999-10-07
EP0947692A1 (en) 1999-10-06

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