EP2635791B1 - Fuel injection system of an internal combustion engine - Google Patents

Fuel injection system of an internal combustion engine Download PDF

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Publication number
EP2635791B1
EP2635791B1 EP11757896.3A EP11757896A EP2635791B1 EP 2635791 B1 EP2635791 B1 EP 2635791B1 EP 11757896 A EP11757896 A EP 11757896A EP 2635791 B1 EP2635791 B1 EP 2635791B1
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EP
European Patent Office
Prior art keywords
throttle
fuel injection
injection system
pump
return flow
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EP11757896.3A
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German (de)
French (fr)
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EP2635791A1 (en
Inventor
Achim Koehler
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system

Definitions

  • the invention relates to a fuel injection system of an internal combustion engine, such as from WO 2007/144227 known, with a tank, which is connected via a pre-pressure pump with a pump interior of a high-pressure pump, wherein the pump interior is connected via a metering unit with a pump working space and further the pump interior via an overflow valve, comprising a valve housing, a valve piston and arranged in a spring chamber valve spring , Is hydraulically connected to a return line.
  • Another fuel injection system of an internal combustion engine is from the DE 10 2008 042 089 A1 known.
  • the switched hydraulic space of the metering unit is connected via a fuel line with three pump working spaces of the high-pressure pump.
  • the overflow valve of this fuel injection system has a hollow-bore piston with an inserted throttle, which connects the spring chamber of this overflow valve with its inlet.
  • the invention has for its object to provide a fuel injection system in which the filling pressure of a pump working space is dependent on the flow rate adjustable.
  • the spring chamber is connected via a throttle circuit with the hydraulic space connected by the metering unit.
  • this throttle circuit which acts as a pressure divider, depending on the pressure, which controls the metering unit, a higher or lower pressure in the spring chamber of the overflow valve, which is more precisely a differential pressure control valve is set.
  • the pressure upstream of the overflow valve thus consists of the purely mechanical portion of the valve spring characteristic and the hydraulic pressure in the spring chamber. Since the pressure in the spring chamber can be varied, it is also possible to vary the pressure upstream of the overflow valve.
  • the throttle circuit is a line connection with a throttle on. Since the metering unit and the overflow valve are normally integrated directly into the pump housing of the high-pressure pump, the line connection may be formed, for example, as a connecting channel. In this case, the throttle is realized by a throttle element inserted into the connecting channel or by a diameter reduction in the manufacturing process of the line connection.
  • the spring chamber is connected to the return line, wherein in a further embodiment in the return line a remindströmdrossel is turned on.
  • the return line can also be connected to the line connection at any point behind the switched throttle, wherein the remindströmdrossel downstream of this connection point must be turned on in the return line.
  • the throttle has a lower throttle rate than the remindströmdrossel.
  • the flow cross section through the throttle is greater than that through the remindströmdrossel.
  • the throttle and / or the remindströmdrossel is a filter, which may be formed, for example, in a further development as a gap filter, upstream.
  • a filter or slit filter chokes are reliably protected from dirt particles.
  • the single figure shows a schematic representation of the interaction of the essential components of a fuel injection system according to the invention.
  • fuel is conveyed from a tank 2 via a filter device into a pump interior 3 of a high-pressure pump 5.
  • the high-pressure pump 5 has a pump housing, in which a pump camshaft is rotatably mounted in bearings 4a, 4b.
  • the bearing points 4a, 4b are fuel-lubricated and via Lagerschmierstoffab2020 Gustaven 6a, 6b of the bearing points 4a, 4b emerging from the pump interior 3 fuel in a return line 7, which opens into the tank 2, discharged.
  • the pump camshaft moves via a roller tappet a pump piston 8 at a rotational movement of the pump cam shaft translationally up and down.
  • the pump piston 8 cooperates with a pump working chamber 9 which can be connected to the pump interior 3 via a metering unit 10.
  • the amount of fuel to be supplied to the pump working chamber 9 is arbitrarily adjustable, for example, as a function of a pressure in a high-pressure accumulator.
  • the fuel introduced into the pump working chamber is conveyed via a high-pressure line 11 into the high-pressure accumulator.
  • a necessary for this flow suction valve for the introduced into the working space 9 fuel and a check valve for shutting off the high-pressure line 11 are inserted directly into a pump cylinder head 12 of the high-pressure pump 5.
  • the switched from the metering unit hydraulic space (shown by a connecting line 13 to the pump working chamber 9) is connected via a line connection 14 with a spring chamber of a spill valve 16 directly or indirectly.
  • the overflow valve 16 has a valve housing 17, in which a valve piston 18 can be adjusted against the force of a valve spring 19.
  • a valve control chamber 20 is also connected to the pump interior 3 (or the supply line to the metering unit 10) by switching on a filter.
  • the valve piston 18 With increasing fuel pressure in the pump interior 3 by a closed metering unit 10, the valve piston 18 is moved in the direction of the spring chamber 15 and releases a discharge opening, which is connected to a discharge line 21, which also opens into the return line 7.
  • this diversion line 21 for example, at a set zero delivery rate, the fuel conveyed by the admission pressure pump 1 and not required for bearing lubrication is deactivated.
  • the hydraulic space (connecting line 13) connected by the metering unit 10 is connected to the spring chamber 15 via a line connection 14.
  • a throttle 22 is turned on in the line connection 14.
  • the spring chamber 15 is connected to the return line 7, wherein in the return line 7 a return flow restrictor 23 is inserted near the spring. If the line connection 14 - as shown - connected via the return line 7 to the spring chamber 15, the remindströmdrossel 23 is arranged in each case downstream of the injection point.
  • the throttle diameter of the throttle 22 is greater than the throttle diameter of the remindströmdrossel 23 so that when the metering unit 10 is open, the pressure in the spring chamber 15 increases, while the pressure in the spring chamber 15 is continuously degraded with closed metering unit 10 to the pressure in the return line 7.
  • the throttle 22 and the remindströmdrossel 23 filters may be upstream in particular gap filter.

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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)

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, wie z.B. aus der WO 2007/144227 bekannt, mit einem Tank, der über eine Vordruckpumpe mit einem Pumpeninnenraum einer Hochdruckpumpe verschaltet ist, wobei der Pumpeninnenraum über eine Zumesseinheit mit einem Pumpenarbeitsraum verschaltet ist und weiterhin der Pumpeninnenraum über ein Überströmventil, aufweisend ein Ventilgehäuse, einen Ventilkolben und eine in einem Federraum angeordnete Ventilfeder, mit einer Rückströmleitung hydraulisch verbunden ist.The invention relates to a fuel injection system of an internal combustion engine, such as from WO 2007/144227 known, with a tank, which is connected via a pre-pressure pump with a pump interior of a high-pressure pump, wherein the pump interior is connected via a metering unit with a pump working space and further the pump interior via an overflow valve, comprising a valve housing, a valve piston and arranged in a spring chamber valve spring , Is hydraulically connected to a return line.

Ein weiteres Kraftstoffeinspritzsystem einer Brennkraftmaschine ist aus der DE 10 2008 042 089 A1 bekannt. Bei diesem Kraftstoffeinspritzsystem ist der geschaltete hydraulische Raum der Zumesseinheit über eine Kraftstoffleitung mit drei Pumpenarbeitsräumen der Hochdruckpumpe verschaltet. Das Überströmventil dieses Kraftstoffeinspritzsystems weist einen hohlgebohrten Kolben mit einer eingesetzten Drossel auf, der den Federraum dieses Überströmventils mit dessen Zulauf verschaltet. Durch diese Ausgestaltung soll der Vordruck am Eingang der Zumesseinheit ausgeglichener als bisher reguliert werden und es sollen Quietschgeräusche auch bei Verwendung von Anschlussleitungen aus Stahl zuverlässig vermieden werden.Another fuel injection system of an internal combustion engine is from the DE 10 2008 042 089 A1 known. In this fuel injection system, the switched hydraulic space of the metering unit is connected via a fuel line with three pump working spaces of the high-pressure pump. The overflow valve of this fuel injection system has a hollow-bore piston with an inserted throttle, which connects the spring chamber of this overflow valve with its inlet. By this configuration, the form at the entrance of the metering unit should be more balanced than previously regulated and squeaking noises should be reliably avoided even when using connecting cables made of steel.

Weiterhin ist es bekannt, den von der Zumesseinheit geschalteten hydraulischen Raum über eine sogenannte Nullförderdrossel mit dem Tank oder einer Zulaufleitung zu der Vordruckpumpe zu verschalten. Durch eine solche Nullförderdrossel soll eine eventuelle Leckage der Zumesseinheit bei einer eingestellten Nullförderung abgeführt werden.Furthermore, it is known to interconnect the hydraulic space connected by the metering unit via a so-called zero-feed throttle with the tank or a supply line to the admission-pressure pump. By means of such a zero-feed throttle, a possible leakage of the metering unit should be removed at a set zero delivery.

Der Erfindung liegt die Aufgabe zugrunde, ein Kraftstoffeinspritzsystem bereitzustellen, bei dem der Fülldruck eines Pumpenarbeitsraums fördermengenabhängig einstellbar ist.The invention has for its object to provide a fuel injection system in which the filling pressure of a pump working space is dependent on the flow rate adjustable.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Diese Aufgabe wird dadurch gelöst, dass der Federraum über eine Drosselschaltung mit dem von der Zumesseinheit geschalteten hydraulischen Raum verbunden ist. Durch diese Drosselschaltung, die als Druckteiler wirkt, wird abhängig vom Druck, den die Zumesseinheit steuert, ein höherer oder geringerer Druck in dem Federraum des Überströmventils, das genauer ein Differenzdruckregelventil ist, eingestellt. Der Druck vor dem Überströmventil setzt sich damit aus dem rein mechanischen Anteil der Ventilfederkennlinie und dem hydraulischen Druck im Federraum zusammen. Da der Druck im Federraum variiert werden kann, lässt sich damit auch der Druck vor dem Überströmventil variieren.This object is achieved in that the spring chamber is connected via a throttle circuit with the hydraulic space connected by the metering unit. By this throttle circuit, which acts as a pressure divider, depending on the pressure, which controls the metering unit, a higher or lower pressure in the spring chamber of the overflow valve, which is more precisely a differential pressure control valve is set. The pressure upstream of the overflow valve thus consists of the purely mechanical portion of the valve spring characteristic and the hydraulic pressure in the spring chamber. Since the pressure in the spring chamber can be varied, it is also possible to vary the pressure upstream of the overflow valve.

In Weiterbildung der Erfindung ist die Drosselschaltung eine Leitungsverbindung mit einer eingeschalteten Drossel. Da die Zumesseinheit und das Überströmventil normalerweise direkt in das Pumpengehäuse der Hochdruckpumpe integriert sind, kann die Leitungsverbindung beispielsweise als Verbindungskanal ausgebildet sein. Dabei wird die Drossel durch ein in den Verbindungskanal eingesetztes Drosselelement oder aber durch eine Durchmesserreduzierung bei dem Fertigungsvorgang der Leitungsverbindung realisiert.In a further development of the invention, the throttle circuit is a line connection with a throttle on. Since the metering unit and the overflow valve are normally integrated directly into the pump housing of the high-pressure pump, the line connection may be formed, for example, as a connecting channel. In this case, the throttle is realized by a throttle element inserted into the connecting channel or by a diameter reduction in the manufacturing process of the line connection.

In Weiterbildung der Erfindung ist der Federraum mit der Rückströmleitung verschaltet, wobei in weiterer Ausgestaltung in die Rückströmleitung eine Rückströmdrossel eingeschaltet ist. Dabei kann die Rückströmleitung auch mit der Leitungsverbindung an beliebiger Stelle hinter der eingeschalteten Drossel verbunden sein, wobei die Rückströmdrossel stromabwärts dieser Verbindungsstelle in die Rückströmleitung eingeschaltet sein muss.In a further development of the invention, the spring chamber is connected to the return line, wherein in a further embodiment in the return line a Rückströmdrossel is turned on. In this case, the return line can also be connected to the line connection at any point behind the switched throttle, wherein the Rückströmdrossel downstream of this connection point must be turned on in the return line.

In weiterer Ausgestaltung der Erfindung weist die Drossel eine niedrigere Drosselrate als die Rückströmdrossel auf. Mit anderen Worten ist der Strömungsquerschnitt durch die Drossel größer als der durch die Rückströmdrossel. Durch diese Abstimmung steigt bei offener Zumesseinheit der Druck im Federraum an, während bei geschlossener Zumesseinheit der Druck im Federraum allmählich auf ungefähr das Rücklaufdruckniveau abfällt. Über eine geeignete Abstimmung der Durchmesser der Drossel und der Rückströmdrossel kann die Druckdifferenz zwischen der offenen Stellung und der geschlossenen Stellung der Zumesseinheit fast beliebig eingestellt werden.In a further embodiment of the invention, the throttle has a lower throttle rate than the Rückströmdrossel. In other words, the flow cross section through the throttle is greater than that through the Rückströmdrossel. By this vote increases with open metering unit, the pressure in the spring chamber, while with the metering unit closed, the pressure in the spring chamber gradually drops to about the return pressure level. By appropriate adjustment of the diameter of the throttle and the Rückströmdrossel the pressure difference between the open position and the closed position of the metering unit can be set almost arbitrarily.

In Weiterbildung der Erfindung ist der Drossel und/oder der Rückströmdrossel ein Filter, der beispielsweise in Weiterbildung als Spaltfilter ausgebildet sein kann, vorgeschaltet. Durch einen solchen Filter bzw. Spaltfilter werden die Drosseln zuverlässig vor Schmutzpartikeln geschützt.In a further development of the invention, the throttle and / or the Rückströmdrossel is a filter, which may be formed, for example, in a further development as a gap filter, upstream. Through such a filter or slit filter chokes are reliably protected from dirt particles.

In weiterer Ausgestaltung der Erfindung ist eine Absteuerleitung des Überströmventils mit der Rückströmleitung verschaltet. Ebenso sind in weiterer Ausgestaltung Lagerschmierstoffabführleitungen der Hochdruckpumpe mit der Rückführleitung verschaltet. Durch diese Ausgestaltungen ist ein kompakter Aufbau des Kraftstoffeinspritzsystems im Bereich der Hochdruckpumpe möglich, indem schon in der Hochdruckpumpe alle entsprechenden Leitungen in die Rückströmleitung einmünden, die dann in geeigneter Weise über eine externe Leitungsverbindung mit dem Tank verschaltet ist.In a further embodiment of the invention, a Absteuerleitung the spill valve is connected to the return line. Likewise, in a further embodiment Lagerschmierstoffabführleitungen the high-pressure pump connected to the return line. Due to these refinements, a compact design of the fuel injection system in the region of the high-pressure pump is possible, in that all corresponding lines in the high-pressure pump open into the return line, which is then connected in a suitable manner to the tank via an external line connection.

Zusammenfassend wird durch die erfindungsgemäße Ausgestaltung Folgendes erreicht:

  • Ein fördermengenabhängiger Fülldruck wird appliziert, beispielsweise werden hohe Fülldrucke bei hohem Füllbedarf und geringe Fülldrücke, wenn nur kleine Kraftstoffmengen befördert werden müssen, eingestellt.
  • Es wird ein deutlich erweiterter Arbeitsbereich erzielt, das heißt, es können variable Druckniveaus stabil eingeregelt werden. Mit einem einzigen Überströmventil (mit nur einer Einstellung) können über Variation der Drosseldurchmesser der Drossel und der Rückströmdrossel unterschiedliche Druckniveaus erzielt werden.
  • Es wird eine geringe Bauteilbelastung vor allem der Ventilfeder erreicht.
  • Es wird eine Kostenreduktion wegen der Vermeidung von Variationen und der Vermeidung von Einsatz von hochwertigen Ventilfedern erreicht, wobei gleichzeitig die Regeldrücke höher als bei bekannten Lösungen einstellbar sind.
  • Es besteht ein geringerer Bauraumbedarf, da mit zunehmendem Regeldruck bei bekannten Ausgestaltungen auch die Federlänge der Ventilfeder zunimmt, insbesondere bei Auslegung einer ausreichenden Schwinglänge bei Druckpulsationen.
  • Bei sogenannten Ein-Steller-Systemen (Regeldruckregelung nur über die Zumesseinheit), kann die Drossel zusätzlich die Funktion einer Nullförderdrossel übernehmen.
  • Die Rückströmdrossel kann zusätzlich die Federraum-Dämpfungsdrossel übernehmen.
In summary, the following is achieved by the embodiment according to the invention:
  • A volume-dependent filling pressure is applied, for example, high filling pressures at high filling requirements and low filling pressures when only small amounts of fuel must be transported, set.
  • A significantly extended working range is achieved, that is, variable pressure levels can be stabilized in a stable manner. With a single overflow valve (with only one setting) different pressure levels can be achieved by varying the throttle diameters of the throttle and the backflow throttle.
  • It is achieved a low component load, especially the valve spring.
  • There is achieved a cost reduction because of the avoidance of variations and the avoidance of the use of high quality valve springs, at the same time the control pressures are higher than in known solutions adjustable.
  • There is a smaller space requirement, since with increasing control pressure in known embodiments, the spring length of the valve spring increases, especially when designing a sufficient vibration length at pressure pulsations.
  • In so-called single-actuator systems (control pressure control only via the metering unit), the throttle can also take over the function of a zero-feed throttle.
  • The Rückströmdrossel can additionally take over the spring chamber damping throttle.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figure embodiment of the invention is described in detail.

Kurze Beschreibung der ZeichnungShort description of the drawing Ausführungsform der ErfindungEmbodiment of the invention

Die einzige Figur zeigt in schematischer Darstellung das Zusammenwirken der wesentlichen Komponenten eines erfindungsgemäßen Kraftstoffeinspritzsystems. Von einer Vordruckpumpe 1 wird aus einem Tank 2 Kraftstoff über eine Filtereinrichtung in einen Pumpeninnenraum 3 einer Hochdruckpumpe 5 gefördert.The single figure shows a schematic representation of the interaction of the essential components of a fuel injection system according to the invention. From a pre-pressure pump 1, fuel is conveyed from a tank 2 via a filter device into a pump interior 3 of a high-pressure pump 5.

Die Hochdruckpumpe 5 weist ein Pumpengehäuse auf, in dem eine Pumpennockenwelle drehbar in Lagerstellen 4a, 4b gelagert ist. Die Lagerstellen 4a, 4b sind kraftstoffgeschmiert und über Lagerschmierstoffabführleitungen 6a, 6b wird der an den Lagerstellen 4a, 4b aus dem Pumpeninnenraum 3 austretende Kraftstoff in eine Rückführleitung 7, die in den Tank 2 einmündet, abgeführt. Die Pumpennockenwelle bewegt über einen Rollenstößel einen Pumpenkolben 8 bei einer Drehbewegung der Pumpennockenwelle translatorisch auf und ab. Der Pumpenkolben 8 wirkt mit einem Pumpenarbeitsraum 9 zusammen, der über eine Zumesseinheit 10 mit dem Pumpeninnenraum 3 verschaltbar ist. Mit der Zumesseinheit 10 ist die dem Pumpenarbeitsraum 9 zuzuführende Kraftstoffmenge beispielsweise in Abhängigkeit eines Drucks in einem Hochdruckspeicher beliebig einstellbar. Bei einer Aufwärtsbewegung des Pumpenkolbens 8 wird der in dem Pumpenarbeitsraum eingebrachte Kraftstoff über eine Hochdruckleitung 11 in den Hochdruckspeicher gefördert. Ein für diesen Fördergang notwendiges Saugventil für den in den Arbeitsraum 9 eingebrachten Kraftstoff und ein Rückschlagventil zur Absperrung der Hochdruckleitung 11 sind direkt in einen Pumpenzylinderkopf 12 der Hochdruckpumpe 5 eingesetzt.The high-pressure pump 5 has a pump housing, in which a pump camshaft is rotatably mounted in bearings 4a, 4b. The bearing points 4a, 4b are fuel-lubricated and via Lagerschmierstoffabführleitungen 6a, 6b of the bearing points 4a, 4b emerging from the pump interior 3 fuel in a return line 7, which opens into the tank 2, discharged. The pump camshaft moves via a roller tappet a pump piston 8 at a rotational movement of the pump cam shaft translationally up and down. The pump piston 8 cooperates with a pump working chamber 9 which can be connected to the pump interior 3 via a metering unit 10. With the metering unit 10, the amount of fuel to be supplied to the pump working chamber 9 is arbitrarily adjustable, for example, as a function of a pressure in a high-pressure accumulator. During an upward movement of the pump piston 8, the fuel introduced into the pump working chamber is conveyed via a high-pressure line 11 into the high-pressure accumulator. A necessary for this flow suction valve for the introduced into the working space 9 fuel and a check valve for shutting off the high-pressure line 11 are inserted directly into a pump cylinder head 12 of the high-pressure pump 5.

Der von der Zumesseinheit geschaltete hydraulische Raum (dargestellt durch eine Verbindungsleitung 13 zu dem Pumpenarbeitsraum 9) ist über eine Leitungsverbindung 14 mit einem Federraum eines Überströmventils 16 direkt oder indirekt verbunden. Das Überströmventil 16 weist ein Ventilgehäuse 17 auf, in dem ein Ventilkolben 18 gegen die Kraft einer Ventilfeder 19 verstellt werden kann. Ein Ventilsteuerraum 20 ist mit dem Pumpeninnenraum 3 (oder der Zuführleitung zu der Zumesseinheit 10) ebenfalls über Einschaltung eines Filters verschaltet. Bei steigendem Kraftstoffdruck in dem Pumpeninnenraum 3 durch eine geschlossene Zumesseinheit 10 wird der Ventilkolben 18 in Richtung zu dem Federraum 15 bewegt und gibt eine Absteueröffnung frei, die mit einer Absteuerleitung 21, die ebenfalls in die Rückführleitung 7 einmündet, verschaltet ist. Über diese Absteuerleitung 21 wird beispielsweise bei einer eingestellten Null-Förderung der von der Vordruckpumpe 1 geförderte und nicht zur Lagerschmierung benötigte Kraftstoff abgesteuert.The switched from the metering unit hydraulic space (shown by a connecting line 13 to the pump working chamber 9) is connected via a line connection 14 with a spring chamber of a spill valve 16 directly or indirectly. The overflow valve 16 has a valve housing 17, in which a valve piston 18 can be adjusted against the force of a valve spring 19. A valve control chamber 20 is also connected to the pump interior 3 (or the supply line to the metering unit 10) by switching on a filter. With increasing fuel pressure in the pump interior 3 by a closed metering unit 10, the valve piston 18 is moved in the direction of the spring chamber 15 and releases a discharge opening, which is connected to a discharge line 21, which also opens into the return line 7. By way of this diversion line 21, for example, at a set zero delivery rate, the fuel conveyed by the admission pressure pump 1 and not required for bearing lubrication is deactivated.

Wie ausgeführt, ist der von der Zumesseinheit 10 geschaltete hydraulische Raum (Verbindungsleitung 13) über eine Leitungsverbindung 14 mit dem Federraum 15 verschaltet. Dabei ist in die Leitungsverbindung 14 eine Drossel 22 eingeschaltet. Weiterhin ist der Federraum 15 mit der Rückströmleitung 7 verschaltet, wobei in die Rückströmleitung 7 federraumnah eine Rückströmdrossel 23 eingesetzt ist. Ist die Leitungsverbindung 14 - wie dargestellt - über die Rückströmleitung 7 mit dem Federraum 15 verschaltet, ist die Rückströmdrossel 23 in jedem Fall stromabwärts der Einmündestelle angeordnet. Der Drosseldurchmesser der Drossel 22 ist größer als der Drosseldurchmesser der Rückströmdrossel 23, so dass bei geöffneter Zumesseinheit 10 der Druck in dem Federraum 15 ansteigt, während der Druck in dem Federraum 15 bei geschlossener Zumesseinheit 10 kontinuierlich auf den Druck in der Rückströmleitung 7 abgebaut wird.As stated, the hydraulic space (connecting line 13) connected by the metering unit 10 is connected to the spring chamber 15 via a line connection 14. In this case, a throttle 22 is turned on in the line connection 14. Furthermore, the spring chamber 15 is connected to the return line 7, wherein in the return line 7 a return flow restrictor 23 is inserted near the spring. If the line connection 14 - as shown - connected via the return line 7 to the spring chamber 15, the Rückströmdrossel 23 is arranged in each case downstream of the injection point. The throttle diameter of the throttle 22 is greater than the throttle diameter of the Rückströmdrossel 23 so that when the metering unit 10 is open, the pressure in the spring chamber 15 increases, while the pressure in the spring chamber 15 is continuously degraded with closed metering unit 10 to the pressure in the return line 7.

Der Drossel 22 und der Rückströmdrossel 23 können Filter insbesondere Spaltfilter vorgeschaltet sein.The throttle 22 and the Rückströmdrossel 23 filters may be upstream in particular gap filter.

Claims (10)

  1. Fuel injection system of an internal combustion engine, with a tank (2) which is connected to a pump interior space (3) of a high-pressure pump (5) via a booster pump (1), wherein the pump interior space (3) is connected to a pump working space (9) via a metering unit (10) and, furthermore, the pump interior space (3) is hydraulically connected to a return flow line (7) via an overflow valve (16) having a valve housing (17), a valve piston (18) and a valve spring (19) arranged in a spring space (15), characterized in that the spring space (15) is connected via a throttle circuit to the hydraulic space connected by the metering unit (10).
  2. Fuel injection system according to Claim 1, characterized in that the throttle circuit is a line connection (14) with an inserted throttle (22).
  3. Fuel injection system according to either of the preceding claims, characterized in that the spring space (15) is connected to the return flow line (7).
  4. Fuel injection system according to Claim 3, characterized in that a return flow throttle (23) is inserted into the return flow line (7).
  5. Fuel injection system according to Claim 4, characterized in that the throttle (22) has a lower throttle rate than the return flow throttle (23).
  6. Fuel injection system according to one of the preceding claims, characterized in that a filter is connected upstream in each case of the throttle (22) and/or of the return flow throttle (23).
  7. Fuel injection system according to Claim 6, characterized in that the filter is a disc filter.
  8. Fuel injection system according to one of the preceding claims, characterized in that a spill line (21) of the overflow valve (16) is connected to the return flow line (7).
  9. Fuel injection system according to one of the preceding claims, characterized in that bearing lubricant removal lines (6a, 6b) of the high-pressure pump (5) are connected to the return flow line (7).
  10. Fuel injection system according to one of the preceding claims, characterized in that the return flow line (7) leads into the tank (2).
EP11757896.3A 2010-11-05 2011-09-21 Fuel injection system of an internal combustion engine Active EP2635791B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010043439A DE102010043439A1 (en) 2010-11-05 2010-11-05 Fuel injection system of an internal combustion engine
PCT/EP2011/066401 WO2012059267A1 (en) 2010-11-05 2011-09-21 Fuel injection system of an internal combustion engine

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EP2635791A1 EP2635791A1 (en) 2013-09-11
EP2635791B1 true EP2635791B1 (en) 2015-01-07

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EP (1) EP2635791B1 (en)
JP (1) JP5727617B2 (en)
KR (1) KR101900965B1 (en)
CN (1) CN103201495B (en)
DE (1) DE102010043439A1 (en)
RU (1) RU2573068C2 (en)
WO (1) WO2012059267A1 (en)

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Publication number Publication date
KR101900965B1 (en) 2018-09-20
WO2012059267A1 (en) 2012-05-10
RU2573068C2 (en) 2016-01-20
CN103201495A (en) 2013-07-10
KR20130126906A (en) 2013-11-21
RU2013125689A (en) 2014-12-10
JP2013545015A (en) 2013-12-19
JP5727617B2 (en) 2015-06-03
CN103201495B (en) 2016-08-17
DE102010043439A1 (en) 2012-05-10
EP2635791A1 (en) 2013-09-11

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