EP1262659A2 - Fuel system for an internal combustion engine - Google Patents

Fuel system for an internal combustion engine Download PDF

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Publication number
EP1262659A2
EP1262659A2 EP02011016A EP02011016A EP1262659A2 EP 1262659 A2 EP1262659 A2 EP 1262659A2 EP 02011016 A EP02011016 A EP 02011016A EP 02011016 A EP02011016 A EP 02011016A EP 1262659 A2 EP1262659 A2 EP 1262659A2
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EP
European Patent Office
Prior art keywords
fuel
pressure
internal combustion
combustion engine
valve device
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.)
Granted
Application number
EP02011016A
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German (de)
French (fr)
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EP1262659B1 (en
EP1262659A3 (en
Inventor
Helmut Rembold
Winfried Moser
Uwe Mueller
Harald Lang
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1262659A2 publication Critical patent/EP1262659A2/en
Publication of EP1262659A3 publication Critical patent/EP1262659A3/en
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Publication of EP1262659B1 publication Critical patent/EP1262659B1/en
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Classifications

    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves
    • F02M63/0052—Pressure relief valves with means for adjusting the opening pressure, e.g. electrically controlled
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/02—Fuel evaporation in fuel rails, e.g. in common rails
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/60—Fuel-injection apparatus having means for facilitating the starting of engines, e.g. with valves or fuel passages for keeping residual pressure in common rails

Definitions

  • the invention first relates to a fuel system for an internal combustion engine, with a fuel tank, with at least one fuel pump, with a fuel manifold, which is fed by the fuel pump, with a valve device with which the pressure in the Fuel rail can be controlled and with at least one fuel injector through which the fuel into a combustion chamber of the internal combustion engine can reach.
  • Such a fuel system is known from DE 195 39 883 A1 known.
  • two connected in series Pump the fuel from a fuel tank into one Fuel manifold, which is commonly referred to as a "rail" referred to as.
  • the Fuel stored under relatively high pressure.
  • To the Fuel manifolds are injectors connected that directly into the fuel Inject combustion chambers.
  • the pressure in the fuel rail is indicated by a Pressure valve controlled.
  • fuel from the fuel rail via a Return line returned to the fuel tank. at the known fuel system is switched off after the Pressure in the fuel rail reduced. by virtue of from heat conduction from the engine block, however, it can in the one in the fuel rail Fuel to form vapor bubbles which are the Difficult to restart the engine.
  • the disadvantage is in the known Fuel system when starting the internal combustion engine Pressure of the first of the two fuel pumps delivered fuel increased to, if necessary existing vapor bubbles as quickly as possible Eliminate fuel system. However, this requires one certain time.
  • the present invention has the task of a Fuel system of the type mentioned above train that one with the fuel system operated internal combustion engine as quickly as possible also in hot state can be started.
  • This task is the beginning of a fuel system mentioned type in that the valve device so is trained that at least in normal Operating pressure in the fuel rail in the not actuated state is closed.
  • the method according to the invention has the advantage that Vapor bubbles cannot form at all because the pressure in the fuel rail at a high level too is held when the internal combustion engine is switched off. Consequently no action is required to take before Possible restarting a hot internal combustion engine Remove vapor bubbles from the fuel system.
  • Valve device is designed so that it is not in your actuated hibernation is closed, so none Connection back from the fuel rail for example to the fuel tank exists. On such unactuated state is generally anyway with the internal combustion engine turned off.
  • Valve device is operated electrically and in de-energized state at least at normal pressure in the Fuel rail is closed.
  • electrical actuated valve devices are very simple and inexpensive to manufacture.
  • a de-energized state is in parked internal combustion engine also easy realizable.
  • valve device it is also possible for the valve device to have a Preloading device which comprises a valve element in Closing direction applied.
  • a biasing device can be, for example, a spring include. The valve element is thus actuated against the force of the pretensioner.
  • Such Valve device is simple to build and works reliably.
  • the pretensioning device can be selected so that the valve device opens when not actuated, when the pressure in the fuel rail is one exceeds a certain value. This measure will ensures that the pressure in the fuel rail with the internal combustion engine turned off cannot exceed the maximum value. This will make the Functional reliability of the fuel rail and connected components guaranteed because of heating of the trapped in the fuel rail Fuel, for example, due to the heat conduction of the internal combustion engine and the associated Expansion of the enclosed fuel not to one Damage to the Krafttoff manifold or included components.
  • the opening pressure the valve device in the non-actuated state lower is the maximum permissible functional pressure Fuel injector.
  • This training of fuel system according to the invention bears the fact Bill that the usual fuel injectors from a certain pressure in the Fuel manifold can no longer be operated safely can. There is also a risk that if exceeded the maximum permissible functional pressure the fuel injector no longer closes securely and therefore Fuel with the internal combustion engine stopped Combustion chamber of the internal combustion engine arrives. Through the Further development according to the invention prevents all of this.
  • the opening pressure of the Valve device at high engine speed is higher than at low engine speed. Because of this measure, the fact becomes Taken into account that it is for a consumption and Low-emission operation of the internal combustion engine cheap is when the pressure of the fuel at the fuel injector at low speed the Internal combustion engine is rather low and at high speed the internal combustion engine is rather high.
  • the opening pressure of the Valve device ensures that each one Operating state of the internal combustion engine corresponding pressure in the fuel rail.
  • the invention also relates to an internal combustion engine, especially for motor vehicles, which a Fuel system includes with a fuel tank, with at least one fuel pump, with a fuel manifold, which is fed by the fuel pump, with a valve device with which the pressure in the Fuel rail can be controlled and with at least one fuel injector through which the fuel into a combustion chamber of the internal combustion engine can reach.
  • a Fuel system includes with a fuel tank, with at least one fuel pump, with a fuel manifold, which is fed by the fuel pump, with a valve device with which the pressure in the Fuel rail can be controlled and with at least one fuel injector through which the fuel into a combustion chamber of the internal combustion engine can reach.
  • Valve device of the fuel system is designed that they are at least at normal pressure in the fuel rail is closed in the unconfirmed state.
  • the invention further relates to a method for operating an internal combustion engine, in particular for motor vehicles, where the fuel comes from a fuel tank at least one fuel pump in a fuel rail and from there via a fuel injector into a combustion chamber of the Internal combustion engine is promoted and in which the pressure in the fuel rail via a valve device is controlled.
  • Valve device at least at normal pressure in the Fuel manifold when not operated closed is.
  • an internal combustion engine carries this overall Reference numeral 10. It is in the present Embodiment only symbolically by a dash-dotted line indicated.
  • the internal combustion engine 10 in turn comprises a fuel system 12.
  • the high pressure fuel pump 22 compresses that of the electric fuel pump 16 pre-compressed fuel and feeds it into a fuel rail 26.
  • This is commonly referred to as "rail".
  • rail In it is the fuel during the operation of the internal combustion engine 10 under very high pressure, up to about 120 bar, saved.
  • To the fuel rail 26 are multiple fuel injectors 28 connected. These are injectors, which the fuel directly into corresponding combustion chambers 30 inject.
  • Fuel can be petrol act just like diesel.
  • the pressure in the fuel rail 26 is one Pressure sensor 32 detected. This delivers signals to Control and regulating device 34.
  • the fuel rail 26 is via a fuel connection 36 with the Fuel connection 18 connected.
  • a pressure valve 38 is arranged, the exact design of which is explained below.
  • the pressure valve 38 is controlled by the control and regulating device 34 driven.
  • the pressure valve 38 is constructed in detail as follows (see Fig. 2):
  • Fig. 2 shows a cylindrical valve body 40 which in Installation position in a cylindrical recess of one in FIG. 2 not shown receiving part used and on this is attached. On this recording part are also Connections for the fuel connection 36 are present.
  • the between the pressure valve 38 and the high pressure fuel pump 22 lying area of The fuel connection bears the reference symbol 36a, whereas the one pointing to the fuel connection 18 Area bears the reference symbol 36b.
  • the valve body 40 is constructed in two parts.
  • lower part 42 is a coaxial to valve body 40 Through hole 44 is present, which is shown in Fig. 2 flared at the top.
  • the conical extension (without Reference number) forms a valve seat for a valve ball 46.
  • the upper part 48 of the valve body 40 in FIG. 2 one also coaxial to the valve body 40 Through hole 50 is present, two of which are radial Branch the running bores 52.
  • the through hole 44 in the lower part 42 of the valve body 40 is with the Inlet of the pressure valve 38 and thus in the installed position with the Line 36a connected, whereas the radial bores 52nd to an outlet of the pressure valve 38 and thus in Lead installation position to line 36b.
  • Valve tappet 54 In the central through bore 50 is a Valve tappet 54 arranged on the upper in Fig. 2 End portion of a magnetic armature 56 is attached.
  • the Valve tappet 54 is in the area of the through bore 50 in a sliding bushing (not shown).
  • a sleeve 58 on the outer lateral surface of the upper part 48 attached, in turn with its upper area in Fig. 3 is connected to a housing body 60.
  • a in Fig. 2 open down blind hole 62 is present.
  • a guide ring 64 is used at the bottom in Fig. 2 .
  • the top one End 66 of the valve lifter 54 slidably.
  • the top End 66 of valve lifter 54 is supported by a compression spring 68 acted on at the base of the blind hole 62 in Housing body 60 supports.
  • About the compression spring 68 and the Valve tappet 54 is ultimately the valve ball 46 against the Valve seat in the through bore 44 in the lower part 42 of the valve body 40 pressed.
  • a retaining ring 70 is attached to the outside of the housing body 60.
  • the retaining ring 70 protrudes radially from the housing body 60 and is coaxial with it overall.
  • On the radially outer one The edge region of the retaining ring 70 is two bracket elements 72 attached, which encompass a magnetic winding 74.
  • the upper Area of the housing body 60, the retaining ring 70 and the Strap elements 72 are extrusion-coated with plastic 76.
  • the Valve ball 46 If no current flows through the magnetic winding 74, the Valve ball 46 with the full force of the compression spring 68 against pressed the valve seat. So in this case it is Pressure valve 38 closed.
  • the compression spring 68 is however dimensioned such that the valve ball 46 against the Force of the compression spring 68 lifts off the valve seat when the Pressure in the fuel rail 26 a maximum permissible value exceeds. That way ensures that if the magnet winding 74 is not can be energized more because, for example, the Power supply is interrupted by a defect that Pressure in the fuel rail 26 a maximum permissible value does not exceed.
  • a variable energization of the magnet winding 74 makes it possible to adapt the opening pressure of the pressure valve 38 to the speed of the internal combustion engine 10. For reasons of emissions and fuel consumption, it is desirable that the fuel pressure applied to the fuel injection devices 28 be lower at low engine speeds 10 than at high speeds. This is normally achieved by energizing the magnetic winding 74 accordingly. If the power supply to the magnet winding 74 is interrupted, for example due to a dropped connector, the opening of the pressure valve 38 can be realized by designing the geometry of the valve seat 46 accordingly, as shown in FIG. 3. The opening pressure PO of the pressure valve 38 increases with the speed n. In any case, it is ensured that the opening pressure PO of the pressure valve 38 is lower than the maximum permissible functional pressure PV max of the fuel injection devices 28.

Abstract

The fuel injection system has a fuel tank (14), at least one fuel pump (16,22) and a fuel collection line (26) for the fuel injectors (28), supplied by the fuel pump. The pressure within the fuel collection line is controlled via a valve device (38) which remains closed upon normal pressure within the fuel collection line. Also included are Independent claims for the following:- (a) an engine for an automobile provided with a direct fuel injection system; (b) an operating method for an engine with a direct fuel injection system.

Description

Stand der TechnikState of the art

Die Erfindung betrifft zunächst ein Kraftstoffsystem für eine Brennkraftmaschine, mit einem Kraftstoffbehälter, mit mindestens einer Kraftstoffpumpe, mit einer Kraftstoff-Sammelleitung, die von der Kraftstoffpumpe gespeist wird, mit einer Ventileinrichtung, mit der der Druck in der Kraftstoff-Sammelleitung gesteuert werden kann, und mit mindestens einer Kraftstoff-Einspritzvorrichtung, über die der Kraftstoff in einen Brennraum der Brennkraftmaschine gelangen kann.The invention first relates to a fuel system for an internal combustion engine, with a fuel tank, with at least one fuel pump, with a fuel manifold, which is fed by the fuel pump, with a valve device with which the pressure in the Fuel rail can be controlled and with at least one fuel injector through which the fuel into a combustion chamber of the internal combustion engine can reach.

Ein solches Kraftstoffsystem ist aus der DE 195 39 883 A1 bekannt. Bei dieser fördern zwei in Reihe geschaltete Pumpen den Kraftstoff aus einem Kraftstoffbehälter in eine Kraftstoff-Sammelleitung, welche gemeinhin auch als "Rail" bezeichnet wird. In der Kraftstoff-Sammelleitung wird der Kraftstoff unter relativ hohem Druck gespeichert. An die Kraftstoff-Sammelleitung sind Einspritzventile angeschlossen, die den Kraftstoff direkt in entsprechende Brennräume einspritzen.Such a fuel system is known from DE 195 39 883 A1 known. In this promote two connected in series Pump the fuel from a fuel tank into one Fuel manifold, which is commonly referred to as a "rail" referred to as. In the fuel rail, the Fuel stored under relatively high pressure. To the Fuel manifolds are injectors connected that directly into the fuel Inject combustion chambers.

Der Druck in der Kraftstoff-Sammelleitung wird durch ein Druckventil gesteuert. Je nach Ansteuerung des Druckventils wird Kraftstoff aus der Kraftstoff-Sammelleitung über eine Rückleitung in den Kraftstoffbehälter zurückgeleitet. Bei dem bekannten Kraftstoffsystem wird nach dem Abstellen der Druck in der Kraftstoff-Sammelleitung abgebaut. Aufgrund von Wärmeleitung vom Motorblock her kann es allerdings dann in dem in der Kraftstoff-Sammelleitung vorhandenen Kraftstoff zur Bildung von Dampfblasen kommen, welche das Wiederanlassen der Brennkraftmaschine erschweren. Um diesen Nachteil zu beseitigen, wird bei dem bekannten Kraftstoffsystem beim Anlassen der Brennkraftmaschine der Druck des von der ersten der beiden Kraftstoffpumpen geförderten Kraftstoffes erhöht, um gegebenenfalls vorhandene Dampfblasen möglichst schnell aus dem Kraftstoffsystem zu eliminieren. Dies benötigt jedoch eine gewisse Zeit.The pressure in the fuel rail is indicated by a Pressure valve controlled. Depending on the control of the pressure valve fuel from the fuel rail via a Return line returned to the fuel tank. at the known fuel system is switched off after the Pressure in the fuel rail reduced. by virtue of from heat conduction from the engine block, however, it can in the one in the fuel rail Fuel to form vapor bubbles which are the Difficult to restart the engine. To this Eliminating the disadvantage is in the known Fuel system when starting the internal combustion engine Pressure of the first of the two fuel pumps delivered fuel increased to, if necessary existing vapor bubbles as quickly as possible Eliminate fuel system. However, this requires one certain time.

Die vorliegende Erfindung hat die Aufgabe, ein Kraftstoffsystem der eingangs genannten Art so weiterzubilden, dass eine mit dem Kraftstoffsystem betriebene Brennkraftmaschine möglichst schnell auch im heißen Zustand gestartet werden kann.The present invention has the task of a Fuel system of the type mentioned above train that one with the fuel system operated internal combustion engine as quickly as possible also in hot state can be started.

Diese Aufgabe wird bei einem Kraftstoffsystem der eingangs genannten Art dadurch gelöst, dass die Ventileinrichtung so ausgebildet ist, dass sie mindestens beim normalen Betriebsdruck in der Kraftstoff-Sammelleitung im nicht betätigten Zustand geschlossen ist.This task is the beginning of a fuel system mentioned type in that the valve device so is trained that at least in normal Operating pressure in the fuel rail in the not actuated state is closed.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren hat den Vorteil, dass sich Dampfblasen gar nicht erst bilden können, da der Druck in der Kraftstoff-Sammelleitung auf einem hohen Niveau auch bei abgestellter Brennkraftmaschine gehalten wird. Somit sind keine Maßnahmen erforderlich, um vor dem Wiederanlassen einer heißen Brennkraftmaschine eventuelle Dampfblasen aus dem Kraftstoffsystem zu entfernen. Das Anlassen einer Brennkraftmaschine, welche mit dem erfindungsgemäßen Kraftstoffsystem ausgerüstet ist, erfolgt daher sehr schnell.The method according to the invention has the advantage that Vapor bubbles cannot form at all because the pressure in the fuel rail at a high level too is held when the internal combustion engine is switched off. Consequently no action is required to take before Possible restarting a hot internal combustion engine Remove vapor bubbles from the fuel system. The Starting an internal combustion engine, which with the The fuel system according to the invention is equipped therefore very quickly.

Das Beibehalten des relativ hohen Drucks in der Kraftstoff-Sammelleitung ist bei dem erfindungsgemäßen Kraftstoffsystem sehr einfach möglich: Die Ventileinrichtung ist so aufgebaut, dass sie in ihrem nicht betätigten Ruhezustand geschlossen ist, also keine Verbindung von der Kraftstoff-Sammelleitung zurück beispielsweise zum Kraftstoffbehälter existiert. Ein solcher nicht betätigter Zustand liegt im Allgemeinen ohnehin bei abgestellter Brennkraftmaschine vor.Maintaining the relatively high pressure in the fuel rail is in the invention Very simple fuel system possible: The Valve device is designed so that it is not in your actuated hibernation is closed, so none Connection back from the fuel rail for example to the fuel tank exists. On such unactuated state is generally anyway with the internal combustion engine turned off.

Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.Advantageous developments of the invention are in Subclaims specified.

In einer ersten Weiterbildung wird vorgeschlagen, dass die Ventileinrichtung elektrisch betätigt wird und im stromlosen Zustand mindestens bei normalem Druck in der Kraftstoff-Sammelleitung geschlossen ist. Elektrisch betätigte Ventileinrichtungen sind sehr einfach und preiswert herzustellen. Ein stromloser Zustand ist bei abgestellter Brennkraftmaschine darüber hinaus leicht realisierbar.In a first further training it is proposed that the Valve device is operated electrically and in de-energized state at least at normal pressure in the Fuel rail is closed. electrical actuated valve devices are very simple and inexpensive to manufacture. A de-energized state is in parked internal combustion engine also easy realizable.

Ferner ist es möglich, dass die Ventileinrichtung eine Vorspanneinrichtung umfasst, welche ein Ventilelement in Schließrichtung beaufschlagt. Eine solche Vorspanneinrichtung kann beispielsweise eine Feder umfassen. Die Betätigung des Ventilelements erfolgt also gegen die Kraft der Vorspanneinrichtung. Eine solche Ventileinrichtung baut einfach und arbeitet zuverlässig.It is also possible for the valve device to have a Preloading device which comprises a valve element in Closing direction applied. Such A biasing device can be, for example, a spring include. The valve element is thus actuated against the force of the pretensioner. Such Valve device is simple to build and works reliably.

Dabei kann die Vorspanneinrichtung so gewählt werden, dass die Ventileinrichtung im nicht betätigten Zustand öffnet, wenn der Druck in der Kraftstoff-Sammelleitung einen bestimmten Wert überschreitet. Durch diese Maßnahme wird sichergestellt, dass der Druck in der Kraftstoff-Sammelleitung bei abgestellter Brennkraftmaschine einen maximalen Wert nicht überschreiten kann. Hierdurch wird die Funktionssicherheit der Kraftstoff-Sammelleitung und angeschlossener Komponenten garantiert, da eine Erwärmung des in der Kraftstoff-Sammelleitung eingeschlossenen Kraftstoffs beispielsweise aufgrund von Wärmeleitung von der Brennkraftmaschine her und die damit verbundene Ausdehnung des eingeschlossenen Kraftstoffes nicht zu einer Beschädigung der Krafttoff-Sammelleitung oder eingeschlossener Komponenten führen kann.The pretensioning device can be selected so that the valve device opens when not actuated, when the pressure in the fuel rail is one exceeds a certain value. This measure will ensures that the pressure in the fuel rail with the internal combustion engine turned off cannot exceed the maximum value. This will make the Functional reliability of the fuel rail and connected components guaranteed because of heating of the trapped in the fuel rail Fuel, for example, due to the heat conduction of the internal combustion engine and the associated Expansion of the enclosed fuel not to one Damage to the Krafttoff manifold or included components.

Dabei ist es besonders vorteilhaft, wenn der Öffnungsdruck der Ventileinrichtung im nicht betätigten Zustand niedriger ist als der maximal zulässige Funktionsdruck der Kraftstoff-Einspritzvorrichtung. Diese Weiterbildung des erfindungsgemäßen Kraftstoffsystems trägt der Tatsache Rechnung, dass die üblichen Kraftstoff-Einspritzvorrichtungen ab einem bestimmten Druck in der Kraftstoff-Sammelleitung nicht mehr sicher betätigt werden können. Außerdem besteht die Gefahr, dass bei Überschreiten des maximal zulässigen Funktionsdruckes die Kraftstoff-Einspritzvorrichtung nicht mehr sicher schließt und somit Kraftstoff bei stehender Brennkraftmaschine in den Brennraum der Brennkraftmaschine gelangt. Durch die erfindungsgemäße Weiterbildung wird all dies verhindert.It is particularly advantageous if the opening pressure the valve device in the non-actuated state lower is the maximum permissible functional pressure Fuel injector. This training of fuel system according to the invention bears the fact Bill that the usual fuel injectors from a certain pressure in the Fuel manifold can no longer be operated safely can. There is also a risk that if exceeded the maximum permissible functional pressure the fuel injector no longer closes securely and therefore Fuel with the internal combustion engine stopped Combustion chamber of the internal combustion engine arrives. Through the Further development according to the invention prevents all of this.

Denkbar ist auch, dass der Öffnungsdruck der Ventileinrichtung bei hoher Drehzahl der Brennkraftmaschine höher ist als bei geringer Drehzahl der Brennkraftmaschine. Aufgrund dieser Maßnahme wird wiederum der Tatsache Rechnung getragen, dass es für einen verbrauchs- und emissionsoptimalen Betrieb der Brennkraftmaschine günstig ist, wenn der Druck des Kraftstoffes an der Kraftstoff-Einspritzvorrichtung bei geringer Drehzahl der Brennkraftmaschine eher niedrig ist und bei hoher Drehzahl der Brennkraftmaschine eher hoch ist. Der Öffnungsdruck der Ventileinrichtung sorgt so für einen dem jeweiligen Betriebszustand der Brennkraftmaschine entsprechenden Druck in der Kraftstoff-Sammelleitung.It is also conceivable that the opening pressure of the Valve device at high engine speed is higher than at low engine speed. Because of this measure, the fact becomes Taken into account that it is for a consumption and Low-emission operation of the internal combustion engine cheap is when the pressure of the fuel at the fuel injector at low speed the Internal combustion engine is rather low and at high speed the internal combustion engine is rather high. The opening pressure of the Valve device ensures that each one Operating state of the internal combustion engine corresponding pressure in the fuel rail.

Die Erfindung betrifft auch eine Brennkraftmaschine, insbesondere für Kraftfahrzeuge, welche ein Kraftstoffsystem umfasst mit einem Kraftstoffbehälter, mit mindestens einer Kraftstoffpumpe, mit einer Kraftstoff-Sammelleitung, die von der Kraftstoffpumpe gespeist wird, mit einer Ventileinrichtung, mit der der Druck in der Kraftstoff-Sammelleitung gesteuert werden kann, und mit mindestens einer Kraftstoff-Einspritzvorrichtung, über die der Kraftstoff in einen Brennraum der Brennkraftmaschine gelangen kann.The invention also relates to an internal combustion engine, especially for motor vehicles, which a Fuel system includes with a fuel tank, with at least one fuel pump, with a fuel manifold, which is fed by the fuel pump, with a valve device with which the pressure in the Fuel rail can be controlled and with at least one fuel injector through which the fuel into a combustion chamber of the internal combustion engine can reach.

Um bei einer solchen Brennkraftmaschine den Heißstart, also das Wiederanlassen der heißen Brennkraftmaschine, zu beschleunigen, wird vorgeschlagen, dass die Ventileinrichtung des Kraftstoffsystems so ausgebildet ist, dass sie mindestens bei normalem Druck in der Kraftstoff-Sammelleitung im nicht bestätigten Zustand geschlossen ist. Im Hinblick auf die Vorteile einer solchen Brennkraftmaschine wird auf die obigen Ausführungen verwiesen.To get the hot start in such an internal combustion engine, that is restarting the hot engine, too accelerate, it is suggested that the Valve device of the fuel system is designed that they are at least at normal pressure in the fuel rail is closed in the unconfirmed state. With regard to the advantages of such Internal combustion engine is based on the above directed.

Die Erfindung betrifft ferner ein Verfahren zum Betreiben einer Brennkraftmaschine insbesondere für Kraftfahrzeuge, bei dem der Kraftstoff aus einem Kraftstoffbehälter über mindestens eine Kraftstoffpumpe in eine Kraftstoff-Sammelleitung und von dort über eine Kraftstoff-Einspritzvorrichtung in einen Brennraum der Brennkraftmaschine gefördert wird und bei dem der Druck in der Kraftstoff-Sammelleitung über eine Ventileinrichtung gesteuert wird.The invention further relates to a method for operating an internal combustion engine, in particular for motor vehicles, where the fuel comes from a fuel tank at least one fuel pump in a fuel rail and from there via a fuel injector into a combustion chamber of the Internal combustion engine is promoted and in which the pressure in the fuel rail via a valve device is controlled.

Um bei einem solchen Verfahren sicherzustellen, dass die Brennkraftmaschine auch im heißen Zustand möglichst schnell angelassen werden kann, wird vorgeschlagen, dass die Ventileinrichtung mindestens bei normalem Druck in der Kraftstoff-Sammelleitung im nicht betätigten Zustand geschlossen ist. Auch hier wird im Hinblick auf die Vorteile auf die obigen Ausführungen verwiesen.In order to ensure that the Internal combustion engine as quickly as possible, even when hot can be started, it is suggested that the Valve device at least at normal pressure in the Fuel manifold when not operated closed is. Again, with regard to the Advantages referred to the above explanations.

Zeichnungdrawing

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung unter Bezugnahme auf die beiliegende Zeichnung im Detail erläutert. In der Zeichnung zeigen:

Fig. 1:
ein Blockschaltbild einer Brennkraftmaschine mit einem Kraftstoffsystem mit einer Ventileinrichtung;
Fig. 2:
einen teilweisen Schnitt durch die Ventileinrichtung von Fig. 1; und
Fig. 3:
ein Diagramm, in dem der Öffnungsdruck der Ventileinrichtung von Fig. 2 über der Drehzahl der Brennkraftmaschine aufgetragen ist.
A preferred exemplary embodiment of the invention is explained in detail below with reference to the accompanying drawing. The drawing shows:
Fig. 1:
a block diagram of an internal combustion engine with a fuel system with a valve device;
Fig. 2:
a partial section through the valve device of Fig. 1; and
Fig. 3:
a diagram in which the opening pressure of the valve device of Fig. 2 is plotted against the speed of the internal combustion engine.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Fig. 1 trägt eine Brennkraftmaschine insgesamt das Bezugszeichen 10. Sie ist im vorliegenden Ausführungsbeispiel nur symbolhaft durch eine strichpunktierte Linie angedeutet. Die Brennkraftmaschine 10 umfasst wiederum ein Kraftstoffsystem 12. In Fig. 1, an internal combustion engine carries this overall Reference numeral 10. It is in the present Embodiment only symbolically by a dash-dotted line indicated. The internal combustion engine 10 in turn comprises a fuel system 12.

Zu diesem gehört ein Kraftstoffbehälter 14, aus dem eine elektrische Kraftstoffpumpe 16 Kraftstoff in eine Kraftstoffverbindung 18 fördert. Über einen Filter 20 gelangt der Kraftstoff zu einer Hochdruck-Kraftstoffpumpe 22. Diese wird auf hier nicht näher dargestellte Art und Weise direkt von einer Kurbelwelle der Brennkraftmaschine 10 angetrieben. Der Druck in der Kraftstoffverbindung 18 wird durch einen Niederdruckregler 24 eingestellt.This includes a fuel tank 14 from which one electric fuel pump 16 fuel into one Fuel connection 18 promotes. Via a filter 20 the fuel reaches a high pressure fuel pump 22. This is in a manner not shown here and Way directly from a crankshaft of the internal combustion engine 10 driven. The pressure in the fuel connection 18 is set by a low pressure regulator 24.

Die Hochdruck-Kraftstoffpumpe 22 komprimiert den von der elektrischen Kraftstoffpumpe 16 vorverdichteten Kraftstoff weiter und fördert ihn in eine Kraftstoff-Sammelleitung 26. Diese wird gemeinhin auch als "Rail" bezeichnet. In ihr ist der Kraftstoff während des Betriebs der Brennkraftmaschine 10 unter sehr hohem Druck, bis ungefähr 120 bar, gespeichert. An die Kraftstoff-Sammelleitung 26 sind mehrere Kraftstoff-Einspritzvorrichtungen 28 angeschlossen. Bei diesen handelt es sich vorliegend um Injektoren, welche den Kraftstoff direkt in entsprechende Brennräume 30 einspritzen. Bei der dargestellten Brennkraftmaschine 10 handelt es sich also um eine solche mit Kraftstoff-Direkteinspritzung. Beim Kraftstoff kann es sich um Benzin ebenso wie um Diesel handeln.The high pressure fuel pump 22 compresses that of the electric fuel pump 16 pre-compressed fuel and feeds it into a fuel rail 26. This is commonly referred to as "rail". In it is the fuel during the operation of the internal combustion engine 10 under very high pressure, up to about 120 bar, saved. To the fuel rail 26 are multiple fuel injectors 28 connected. These are injectors, which the fuel directly into corresponding combustion chambers 30 inject. In the illustrated internal combustion engine 10 So it is one with direct fuel injection. Fuel can be petrol act just like diesel.

Der Druck in der Kraftstoff-Sammelleitung 26 wird von einem Drucksensor 32 erfasst. Dieser liefert Signale an ein Steuer- und Regelgerät 34. Die Kraftstoff-Sammelleitung 26 ist über eine Kraftstoffverbindung 36 mit der Kraftstoffverbindung 18 verbunden. In der Kraftstoffverbindung 36 ist ein Druckventil 38 angeordnet, dessen genaue Ausgestaltung weiter unten erläutert wird. Das Druckventil 38 wird vom Steuer- und Regelgerät 34 angesteuert.The pressure in the fuel rail 26 is one Pressure sensor 32 detected. This delivers signals to Control and regulating device 34. The fuel rail 26 is via a fuel connection 36 with the Fuel connection 18 connected. In the Fuel connection 36, a pressure valve 38 is arranged, the exact design of which is explained below. The pressure valve 38 is controlled by the control and regulating device 34 driven.

Das Druckventil 38 ist im Einzelnen wie folgt aufgebaut (vgl. Fig. 2): The pressure valve 38 is constructed in detail as follows (see Fig. 2):

Fig. 2 zeigt einen zylindrischen Ventilkörper 40, der in Einbaulage in eine zylindrische Ausnehmung eines in Fig. 2 nicht dargestellten Aufnahmeteils eingesetzt und an diesem befestigt ist. An diesem Aufnahmeteil sind auch die Anschlüsse für die Kraftstoffverbindung 36 vorhanden. Der zwischen dem Druckventil 38 und der Hochdruck-Kraftstoffpumpe 22 liegende Bereich der Kraftstoffverbindung trägt dabei das Bezugszeichen 36a, wohingegen der zur Kraftstoffverbindung 18 hin zeigende Bereich das Bezugszeichen 36b trägt.Fig. 2 shows a cylindrical valve body 40 which in Installation position in a cylindrical recess of one in FIG. 2 not shown receiving part used and on this is attached. On this recording part are also Connections for the fuel connection 36 are present. The between the pressure valve 38 and the high pressure fuel pump 22 lying area of The fuel connection bears the reference symbol 36a, whereas the one pointing to the fuel connection 18 Area bears the reference symbol 36b.

Der Ventilkörper 40 ist zweiteilig aufgebaut. Im in Fig. 2 unteren Teil 42 ist eine zum Ventilkörper 40 koaxiale Durchgangsbohrung 44 vorhanden, die sich in Fig. 2 nach oben hin konisch erweitert. Die konische Erweiterung (ohne Bezugszeichen) bildet einen Ventilsitz für eine Ventilkugel 46. Im in Fig. 2 oberen Teil 48 des Ventilkörpers 40 ist eine ebenfalls zum Ventilkörper 40 koaxiale Durchgangsbohrung 50 vorhanden, von der zwei radial verlaufende Bohrungen 52 abzweigen. Die Durchgangsbohrung 44 im unteren Teil 42 des Ventilkörpers 40 ist mit dem Einlass des Druckventils 38 und somit in Einbaulage mit der Leitung 36a verbunden, wohingegen die radialen Bohrungen 52 zu einem Auslass des Druckventils 38 und somit in Einbaulage zur Leitung 36b führen.The valve body 40 is constructed in two parts. In Fig. 2 lower part 42 is a coaxial to valve body 40 Through hole 44 is present, which is shown in Fig. 2 flared at the top. The conical extension (without Reference number) forms a valve seat for a valve ball 46. In the upper part 48 of the valve body 40 in FIG. 2 one also coaxial to the valve body 40 Through hole 50 is present, two of which are radial Branch the running bores 52. The through hole 44 in the lower part 42 of the valve body 40 is with the Inlet of the pressure valve 38 and thus in the installed position with the Line 36a connected, whereas the radial bores 52nd to an outlet of the pressure valve 38 and thus in Lead installation position to line 36b.

In der zentrischen Durchgangsbohrung 50 ist ein Ventilstößel 54 angeordnet, an dessen in Fig. 2 oberem Endabschnitt ein Magnetanker 56 befestigt ist. Der Ventilstößel 54 ist im Bereich der Durchgangsbohrung 50 in einer Gleitbuchse (nicht dargestellt) geführt. Im oberen Bereich des oberen Teils 48 des Ventilkörpers 40 ist auf der äußeren Mantelfläche des oberen Teils 48 eine Hülse 58 befestigt, die mit ihrem in Fig. 3 oberen Bereich wiederum mit einem Gehäusekörper 60 verbunden ist. In diesem ist ein in Fig. 2 nach unten offenes Sackloch 62 vorhanden. In the central through bore 50 is a Valve tappet 54 arranged on the upper in Fig. 2 End portion of a magnetic armature 56 is attached. The Valve tappet 54 is in the area of the through bore 50 in a sliding bushing (not shown). At the top The area of the upper part 48 of the valve body 40 is open a sleeve 58 on the outer lateral surface of the upper part 48 attached, in turn with its upper area in Fig. 3 is connected to a housing body 60. In this is a in Fig. 2 open down blind hole 62 is present.

Am in Fig. 2 unteren Ende des Sacklochs 62 ist in dieses ein Führungsring 64 eingesetzt. In diesem ist das obere Ende 66 des Ventilstößels 54 gleitend geführt. Das obere Ende 66 des Ventilstößels 54 wird von einer Druckfeder 68 beaufschlagt, die sich an der Basis des Sacklochs 62 im Gehäusekörper 60 abstützt. Über die Druckfeder 68 und den Ventilstößel 54 wird letztlich die Ventilkugel 46 gegen den Ventilsitz in der Durchgangsbohrung 44 im unteren Teil 42 des Ventilkörpers 40 gedrückt.At the bottom in Fig. 2 the blind hole 62 is in this a guide ring 64 is used. In this is the top one End 66 of the valve lifter 54 slidably. The top End 66 of valve lifter 54 is supported by a compression spring 68 acted on at the base of the blind hole 62 in Housing body 60 supports. About the compression spring 68 and the Valve tappet 54 is ultimately the valve ball 46 against the Valve seat in the through bore 44 in the lower part 42 of the valve body 40 pressed.

Am Gehäusekörper 60 ist außen ein Haltering 70 befestigt. Der Haltering 70 ragt radial vom Gehäusekörper 60 ab und ist insgesamt koaxial zu diesem. An dem radial äußeren Randbereich des Halterings 70 sind zwei Bügelelemente 72 befestigt, die eine Magnetwicklung 74 umgreifen. Der obere Bereich des Gehäusekörpers 60, der Haltering 70 und die Bügelelemente 72 sind mit Kunststoff 76 umspritzt.A retaining ring 70 is attached to the outside of the housing body 60. The retaining ring 70 protrudes radially from the housing body 60 and is coaxial with it overall. On the radially outer one The edge region of the retaining ring 70 is two bracket elements 72 attached, which encompass a magnetic winding 74. The upper Area of the housing body 60, the retaining ring 70 and the Strap elements 72 are extrusion-coated with plastic 76.

Wenn die Brennkraftmaschine 10 eingeschaltet ist, wird der Druck in der Kraftstoff-Sammelleitung 26 vom Drucksensor 32 erfasst und über das Steuer- und Regelgerät 34 das Druckventil 38 so angesteuert, dass in der Kraftstoff-Sammelleitung 26 ein gewünschter Druck herrscht. Dabei führt eine Bestromung der Magnetwicklung 74 zu einer auf den Magnetanker 56 in Richtung des Pfeiles 78 wirkenden Kraft. Diese wird der Schließkraft der Druckfeder 68 überlagert. Somit wird die Ventilkugel 46 bei einer Bestromung der Magnetwicklung 74 mit geringerer Kraft gegen den Ventilsitz gedrückt, wodurch der Öffnungsdruck des Druckventils 38 variiert werden kann.When the engine 10 is turned on, the Pressure in the fuel rail 26 from the pressure sensor 32 detected and the control device 34 Pressure valve 38 controlled so that in the fuel rail 26 there is a desired pressure. there leads a current to the magnetic winding 74 to one the armature 56 acting in the direction of arrow 78 Force. This becomes the closing force of the compression spring 68 superimposed. Thus, the valve ball 46 at one Current supply to the magnet winding 74 with less force pressed the valve seat, causing the opening pressure of the Pressure valve 38 can be varied.

Fließt kein Strom durch die Magnetwicklung 74, wird die Ventilkugel 46 mit der vollen Kraft der Druckfeder 68 gegen den Ventilsitz gedrückt. In diesem Fall ist also das Druckventil 38 geschlossen. Die Druckfeder 68 ist allerdings so bemessen, dass die Ventilkugel 46 gegen die Kraft der Druckfeder 68 vom Ventilsitz abhebt, wenn der Druck in der Kraftstoff-Sammelleitung 26 einen maximal zulässigen Wert überschreitet. Auf diese Weise wird sichergestellt, dass dann, wenn die Magnetwicklung 74 nicht mehr bestromt werden kann, weil beispielsweise die Stromversorgung durch einen Defekt unterbrochen ist, der Druck in der Kraftstoff-Sammelleitung 26 einen maximal zulässigen Wert nicht überschreitet.If no current flows through the magnetic winding 74, the Valve ball 46 with the full force of the compression spring 68 against pressed the valve seat. So in this case it is Pressure valve 38 closed. The compression spring 68 is however dimensioned such that the valve ball 46 against the Force of the compression spring 68 lifts off the valve seat when the Pressure in the fuel rail 26 a maximum permissible value exceeds. That way ensures that if the magnet winding 74 is not can be energized more because, for example, the Power supply is interrupted by a defect that Pressure in the fuel rail 26 a maximum permissible value does not exceed.

Somit wird die Funktionssicherheit der Kraftstoff-Einspritzvorrichtungen 28, welche nur bis zu einem bestimmten maximalen Druck sicher arbeiten können, gewährleistet. Ferner wird sichergestellt, dass es bei abgestellter Brennkraftmaschine in dem in der Kraftstoff-Sammelleitung 26 eingeschlossenen Kraftstoffvolumen aufgrund von Wärmeleitung innerhalb der Kraftstoff-Sammelleitung 26 nicht zu einem unzulässigen Druckanstieg kommen kann, welcher beispielsweise zu einer ungewollten Leckage der Kraftstoff-Einspritzvorrichtungen 28 in die Brennräume 30 hinein führen könnte.This ensures the functional reliability of the fuel injection devices 28, which only up to one certain maximum pressure can work safely guaranteed. It also ensures that parked internal combustion engine in the in the fuel manifold 26 enclosed fuel volume due to heat conduction within the fuel rail 26 does not lead to an impermissible increase in pressure can come, for example, to an unwanted Leakage of fuel injectors 28 in the Combustion chambers 30 could lead into it.

Bei abgestellter Brennkraftmaschine 10 ist die Magnetwicklung 74 stromlos. Wie bereits ausgeführt wurde, wird in diesem Fall die Ventilkugel 46 mit der maximalen Kraft der Druckfeder 68 gegen den Ventilsitz gedrückt. Das Druckventil 38 ist somit geschlossen und das in der Kraftstoff-Sammelleitung 26 vorhandene Kraftstoffvolumen nach außen hin abgeschlossen. Der in der Kraftstoff-Sammelleitung 26 vorhandene Druck wird somit bei abgestellter Brennkraftmaschine 10 nicht abgelassen, sondern beibehalten.When the internal combustion engine 10 is turned off Magnet winding 74 de-energized. As already stated, in this case, the valve ball 46 with the maximum Force of the compression spring 68 pressed against the valve seat. The Pressure valve 38 is thus closed and in the Fuel manifold 26 existing fuel volume completed on the outside. The one in the fuel rail 26 existing pressure is thus at parked internal combustion engine 10 not drained, but keep it.

Durch eine variable Bestromung der Magnetwicklung 74 ist es möglich, den Öffnungsdruck des Druckventils 38 an die Drehzahl der Brennkraftmaschine 10 anzupassen. Aus Emissions- und Verbrauchsgründen ist es gewünscht, dass der an den Kraftstoff-Einspritzvorrichtungen 28 anliegende Kraftstoffdruck bei niedrigen Drehzahlen der Brennkraftmaschine 10 niedriger ist als bei hohen Drehzahlen. Dies wird normalerweise durch eine entsprechende Bestromung der Magnetwicklung 74 erreicht. Ist die Stromversorgung zu der Magnetwicklung 74 beispielsweise aufgrund eines abgefallenen Steckers unterbrochen, kann durch eine entsprechende Gestaltung der Geometrie des Ventilsitzes der Ventilkugel 46 dennoch eine solche Öffnungscharakteristik des Druckventils 38 realisiert werden, wie sie in Fig. 3 dargestellt ist. Dabei steigt der Öffnungsdruck PO des Druckventils 38 mit der Drehzahl n. In jedem Falle ist dabei sichergestellt, dass der Öffnungsdruck PO des Druckventils 38 kleiner ist als der maximal zulässige Funktionsdruck PVmax der Kraftstoff-Einspritzvorrichtungen 28.A variable energization of the magnet winding 74 makes it possible to adapt the opening pressure of the pressure valve 38 to the speed of the internal combustion engine 10. For reasons of emissions and fuel consumption, it is desirable that the fuel pressure applied to the fuel injection devices 28 be lower at low engine speeds 10 than at high speeds. This is normally achieved by energizing the magnetic winding 74 accordingly. If the power supply to the magnet winding 74 is interrupted, for example due to a dropped connector, the opening of the pressure valve 38 can be realized by designing the geometry of the valve seat 46 accordingly, as shown in FIG. 3. The opening pressure PO of the pressure valve 38 increases with the speed n. In any case, it is ensured that the opening pressure PO of the pressure valve 38 is lower than the maximum permissible functional pressure PV max of the fuel injection devices 28.

Claims (8)

Kraftstoffsystem (12) für eine Brennkraftmaschine (10), mit einem Kraftstoffbehälter (14), mit mindestens einer Kraftstoffpumpe (16, 22), mit einer Kraftstoff-Sammelleitung (26), die von der Kraftstoffpumpe (22) gespeist wird, mit einer Ventileinrichtung (38), mit der der Druck in der Kraftstoff-Sammelleitung (26) gesteuert werden kann, und mit mindestens einer Kraftstoff-Einspritzvorrichtung (28), über die der Kraftstoff in einen Brennraum (30) der Brennkraftmaschine (10) gelangen kann, dadurch gekennzeichnet, dass die Ventileinrichtung (38) so ausgebildet ist, dass sie mindestens beim normalen Betriebsdruck in der Kraftstoff-Sammelleitung (26) im nicht betätigten Zustand geschlossen ist.Fuel system (12) for an internal combustion engine (10), with a fuel tank (14), with at least one fuel pump (16, 22), with a fuel manifold (26) which is fed by the fuel pump (22), with a valve device (38), with the pressure in the fuel collecting line can be controlled (26), and at least one fuel injection device (28) via which the fuel can pass into a combustion chamber (30) of the internal combustion engine (10), characterized characterized in that the valve device (38) is designed such that it is closed in the non-actuated state at least at normal operating pressure in the fuel collecting line (26). Kraftstoffsystem (12) nach Anspruch 1, dadurch gekennzeichnet, dass die Ventileinrichtung (38) elektrisch betätigt wird und im stromlosen Zustand mindestens bei normalem Druck in der Kraftstoff-Sammelleitung (26) geschlossen ist.Fuel system (12) according to claim 1, characterized in that the valve device (38) is actuated electrically and is closed in the de-energized state at least at normal pressure in the fuel collecting line (26). Kraftstoffsystem (12) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Ventileinrichtung (38) eine Vorspanneinrichtung (68) umfasst, welche ein Ventilelement (46) in Schließrichtung beaufschlagt. Fuel system (12) according to one of claims 1 or 2, characterized in that the valve device (38) comprises a pretensioning device (68) which acts on a valve element (46) in the closing direction. Kraftstoffsystem (12) nach Anspruch 3, dadurch gekennzeichnet, dass die Vorspanneinrichtung (68) so ausgebildet ist, dass die Ventileinrichtung (38) im nicht betätigten Zustand öffnet, wenn der Druck in der Kraftstoff-Sammelleitung (26) einen bestimmten Wert überschreitet.Fuel system (12) according to claim 3, characterized in that the pretensioning device (68) is designed such that the valve device (38) opens in the non-actuated state when the pressure in the fuel collecting line (26) exceeds a certain value. Kraftstoffsystem (12) nach Anspruch 4, dadurch gekennzeichnet, dass der Öffnungsdruck der Ventileinrichtung (38) im nicht betätigten Zustand niedriger ist als der maximal zulässige Funktionsdruck der Kraftstoff-Einspritzvorrichtung (28).Fuel system (12) according to Claim 4, characterized in that the opening pressure of the valve device (38) in the non-actuated state is lower than the maximum permissible functional pressure of the fuel injection device (28). Kraftstoffsystem (12) nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass der Öffnungsdruck der Ventileinrichtung (38) bei hoher Drehzahl der Brennkraftmaschine (10) höher ist als bei geringer Drehzahl der Brennkraftmaschine (10).Fuel system (12) according to one of claims 3 to 5, characterized in that the opening pressure of the valve device (38) at a high speed of the internal combustion engine (10) is higher than at a low speed of the internal combustion engine (10). Brennkraftmaschine (10), insbesondere für Kraftfahrzeuge, welche ein Kraftstoffsystem (12) umfasst mit einem Kraftstoffbehälter (14), mit mindestens einer Kraftstoffpumpe (16, 22), mit einer Kraftstoff-Sammelleitung (26), die von der Kraftstoffpumpe (22) gespeist wird, mit einer Ventileinrichtung (38), mit der der Druck in der Kraftstoff-Sammelleitung (26) gesteuert werden kann, und mit mindestens einer Kraftstoff-Einspritzvorrichtung (28), über die der Kraftstoff in einen Brennraum (30) der Brennkraftmaschine (10) gelangen kann, dadurch gekennzeichnet, dass die Ventileinrichtung (38) des Kraftstoffsystems (12) so ausgebildet ist, dass sie mindestens bei normalem Druck in der Kraftstoff-Sammelleitung (26) im nicht betätigten Zustand geschlossen ist. Internal combustion engine (10), in particular for motor vehicles, which comprises a fuel system (12) with a fuel tank (14), with at least one fuel pump (16, 22), with a fuel manifold (26) fed by the fuel pump (22) with a valve device (38), with which the pressure in the fuel collecting line (26) can be controlled, and with at least one fuel injection device (28), via which the fuel into a combustion chamber (30) of the internal combustion engine (10 ), characterized in that the valve device (38) of the fuel system (12) is designed such that it is closed in the non-actuated state at least at normal pressure in the fuel manifold (26). Verfahren zum Betreiben einer Brennkraftmaschine (10) insbesondere für Kraftfahrzeuge, bei dem der Kraftstoff aus einem Kraftstoffbehälter (14) über mindestens eine Kraftstoffpumpe (16, 22) in eine Kraftstoff-Sammelleitung (26) und von dort über eine Kraftstoff-Einspritzvorrichtung (28) in einen Brennraum (30) der Brennkraftmaschine (10) gefördert wird und bei dem der Druck in der Kraftstoff-Sammelleitung (26) über eine Ventileinrichtung (38) gesteuert wird, dadurch gekennzeichnet, dass die Ventileinrichtung (38) mindestens bei normalem Druck in der Kraftstoff-Sammelleitung (26) im nicht betätigten Zustand geschlossen ist.Method for operating an internal combustion engine (10), in particular for motor vehicles, in which the fuel from a fuel tank (14) via at least one fuel pump (16, 22) into a fuel collecting line (26) and from there via a fuel injection device (28) is fed into a combustion chamber (30) of the internal combustion engine (10) and in which the pressure in the fuel manifold (26) is controlled via a valve device (38), characterized in that the valve device (38) at least at normal pressure in the Fuel manifold (26) is closed in the non-actuated state.
EP20020011016 2001-05-29 2002-05-17 Fuel system for an internal combustion engine Expired - Lifetime EP1262659B1 (en)

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DE2001125982 DE10125982A1 (en) 2001-05-29 2001-05-29 Fuel system for an internal combustion engine, internal combustion engine, and method for operating an internal combustion engine

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WO2006100141A1 (en) * 2005-03-21 2006-09-28 Robert Bosch Gmbh Fuel injection device for an internal combusting engine

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EP1262659B1 (en) 2010-08-04
DE10125982A1 (en) 2002-12-12
JP2003028027A (en) 2003-01-29
DE50214563D1 (en) 2010-09-16
JP3836399B2 (en) 2006-10-25
EP1262659A3 (en) 2004-12-22

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