EP0713968B1 - Fuel injection rail with collecting space for vapour bubbles - Google Patents

Fuel injection rail with collecting space for vapour bubbles Download PDF

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Publication number
EP0713968B1
EP0713968B1 EP95115187A EP95115187A EP0713968B1 EP 0713968 B1 EP0713968 B1 EP 0713968B1 EP 95115187 A EP95115187 A EP 95115187A EP 95115187 A EP95115187 A EP 95115187A EP 0713968 B1 EP0713968 B1 EP 0713968B1
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EP
European Patent Office
Prior art keywords
fuel
injection
line
collecting space
injection line
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.)
Expired - Lifetime
Application number
EP95115187A
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German (de)
French (fr)
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EP0713968A1 (en
Inventor
Albin Bergmann
Robert Mahler
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0713968A1 publication Critical patent/EP0713968A1/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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails

Definitions

  • the invention relates to a fuel injection rail of an internal combustion engine, which is connected to a collecting space for fuel vapor bubbles, which is connected to a fuel feed line via a line section.
  • a fuel injection rail for a return-free fuel supply system in particular a mixture-compressing internal combustion engine
  • EP 0 593 053 A1 is known from EP 0 593 053 A1.
  • the vapor bubbles are to pass into the collecting space via the line section branching off from the fuel supply line and are later to be fed again in small doses to the injection valves branching off from the injection rail via the other connection between the collecting space and the injection rail.
  • the invention Since in this known device, in particular, the removal of the fuel vapor bubbles accumulated in the collecting space has proven to be problematic, the invention has set itself the task of showing improvements in this regard. To solve this problem, it is provided that the line section branching off from the collecting space opens into the fuel feed line in the manner of a suction jet pump. Advantageous training and further training are included in the subclaims.
  • a fuel injection bar designated in its entirety by 1 supplies several fuel injectors as usual 2 a mixture-compressing internal combustion engine. This is via a fuel feed line 3 Injection bar 1 fuel supplied, one earlier still common return line is the one described here Injection bar 1 not provided.
  • the injection bar is installed to remedy this problem 1 with a collecting space 4 for fuel vapor bubbles in connection.
  • this collecting space 4 which is preferably geodetic lies above the injection bar 1, will Separate the resulting fuel vapor bubbles automatically.
  • the vapor bubbles can directly over the suction jet-like line section be dissipated, but actually these vapor bubbles largely through the ability of the fuel to both air and evaporated fuel up to absorb to some extent, degraded. Because about that Injection bar 1 always fresh fuel in the Arrives in collecting space 4, there is a relatively large transition area between the vapor bubbles as well as the liquid Fuel so that the vapor bubbles are largely absorbed can be.
  • EP 0 593 053 A1 is used in the present injection molding thus no gaseous fuel is drawn off, but liquid fuel saturated with vapor bubbles. The gas components in this are liquid, with vapor bubbles saturated fuel so low that no combustion problems may occur.
  • the collecting space 4 is in the essentially geodesically above the actual, the Injection valves 2 supplying injection rail section, to make sure that the vapor bubbles are due to their lower specific weight too actually get into this collecting space 4.
  • the collecting space 4 While at 1 the collecting space 4 as a separate one Volume in the supply line 3 opposite End region of the injection bar 1 is formed 2, the collecting space 4 structurally summarized with the injection bar 1. Only a partition provided with through openings 8 9 separates the collecting space 4 from the so-called supply section la.
  • the passage openings 8 are located in the partition 9 essentially directly above the branch points of the individual injection valves 2, however, this can as well further details, especially of a constructive nature designed differently from the exemplary embodiments shown be without leaving the content of the claims.

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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

Die Erfindung betrifft eine Kraftstoff-Einspritzleiste einer Brennkraftmaschine, die mit einem Sammelraum für Kraftstoff-Dampfblasen in Verbindung steht, der über einen Leitungsabschnitt mit einer Kraftstoff-Zulaufleitung verbunden ist.
Bekannt ist eine derartige Einspritzleiste für ein rücklauffreies Kraftstoff-Versorgungssystem insbesondere einer gemischverdichtenden Brennkraftmaschine aus der EP 0 593 053 Al. Bei dieser bekannten Einspritzleiste sollen die Dampfblasen über den von der Kraftstoff-Zulaufleitung abzweigenden Leitungsabschnitt in den Sammelraum gelangen und später in geringer Dosierung kontinuierlich über die andere Verbindung zwischen dem Sammelraum und der Einspritzleiste den von der Einspritzleiste abzweigenden Einspritzventilen wieder zugeführt werden.The invention relates to a fuel injection rail of an internal combustion engine, which is connected to a collecting space for fuel vapor bubbles, which is connected to a fuel feed line via a line section.
Such an injection rail for a return-free fuel supply system, in particular a mixture-compressing internal combustion engine, is known from EP 0 593 053 A1. In this known injection rail, the vapor bubbles are to pass into the collecting space via the line section branching off from the fuel supply line and are later to be fed again in small doses to the injection valves branching off from the injection rail via the other connection between the collecting space and the injection rail.

Da sich bei dieser bekannten Vorrichtung insbesondere die Abfuhr der im Sammelraum angesammelten Kraftstoff-Dampfblasen als problematisch herausgestellt hat, hat sich die Erfindung die Aufgabe gestellt, diesbezüglich Verbesserungen aufzuzeigen.
Zur Lösung dieser Aufgabe ist vorgesehen, daß der vom Sammelraum abzweigende Leitungsabschnitt saugstrahlpumpenartig in der Kraftstoff-Zulaufleitung mündet. Vorteilhafte Aus- und Weiterbildungen sind Inhalt der Unteransprüche.Since in this known device, in particular, the removal of the fuel vapor bubbles accumulated in the collecting space has proven to be problematic, the invention has set itself the task of showing improvements in this regard.
To solve this problem, it is provided that the line section branching off from the collecting space opens into the fuel feed line in the manner of a suction jet pump. Advantageous training and further training are included in the subclaims.

Näher erläutert wird die Erfindung anhand zweier lediglich prinzipiell dargestellter bevorzugter Ausführungsbeispiele. Dabei zeigen die Fig. 1, 2 Prinzipschnitte durch erfindungsgemäße Kraftstoff-Einspritzleisten.The invention is only explained in more detail with reference to two preferred embodiments shown in principle. 1, 2 show principle sections by fuel injection strips according to the invention.

Eine in ihrer Gesamtheit mit 1 bezeichnete Kraftstoff-Einspritzleiste versorgt wie üblich mehrere Kraftstoff-Einspritzventile 2 einer gemischverdichtenden Brennkraftmaschine. Über eine Kraftstoff-Zulaufleitung 3 wird dieser Einspritzleiste 1 Kraftstoff zugeführt, eine früher noch übliche Rücklaufleitung ist bei der hier beschriebenen Einspritzleiste 1 nicht vorgesehen.A fuel injection bar designated in its entirety by 1 supplies several fuel injectors as usual 2 a mixture-compressing internal combustion engine. This is via a fuel feed line 3 Injection bar 1 fuel supplied, one earlier still common return line is the one described here Injection bar 1 not provided.

Insbesondere in Stillstandsphasen der zugeordneten Brennkraftmaschine können sich innerhalb der Einspritzleiste 1 Kraftstoff-Dampfblasen bilden. Diese Dampfblasen wurden bei früheren Einspritzleisten mit Rücklaufleitungen bei Inbetriebnahme der Brennkraftmaschine über die Rücklaufleitung abgeführt und stellten daher kein Problem dar. Bei den neuerdings in Entwicklung stehenden Kraftstoff-Versorgungssystemen jedoch ist eine einfache Dampfblasen-Abfuhr nicht möglich, so daß diese Dampfblasen die Versorgung der Einspritzventile 2 bzw. der Brennkraftmaschine selbst mit Kraftstoff erheblich gefährden können.Particularly in the idle phases of the assigned internal combustion engine can within the injection bar 1 Form fuel vapor bubbles. These vapor bubbles were with previous injection strips with return lines Commissioning of the internal combustion engine via the return line dissipated and therefore posed no problem. In the fuel supply systems that have recently been developed however, is a simple vapor bubble removal not possible, so these steam bubbles supply of the injection valves 2 and the internal combustion engine can be at significant risk even with fuel.

Um dieser Problematik abzuhelfen, steht die Einspritzleiste 1 mit einem Sammelraum 4 für Kraftstoff-Dampfblasen in Verbindung. In diesen Sammelraum 4, der bevorzugt geodätisch oberhalb der Einspritzleiste 1 liegt, werden sich die entstehenden Kraftstoff-Dampfblasen selbsttätig absondern. The injection bar is installed to remedy this problem 1 with a collecting space 4 for fuel vapor bubbles in connection. In this collecting space 4, which is preferably geodetic lies above the injection bar 1, will Separate the resulting fuel vapor bubbles automatically.

Es ist jedoch erforderlich, beispielsweise anschließend an einen erfolgreichen Start der Brennkraftmaschine diese Dampfblasen kontinuierlich wieder aus dem Sammelraum 4 zu entfernen. Dies erfolgt erfindungsgemäß über einen vom Sammelraum 4 abzweigenden und in der Zulaufleitung 3 mündenden Leitungsabschnitt 5. Dieser Leitungsabschnitt 5 mündet saugstrahlpumpenartig in der Zulaufleitung 3, was zur Folge hat, daß der über die Zulaufleitung 3 in die Einspritzleiste 1 einströmende Kraftstoffstrom das sich im Sammelraum 4 befindende Kraftstoffvolumen - sei es in dampfförmiger oder flüssiger Form - quasi absaugt. Unter Zuhilfenahme des Saugstrahlpumpeneffektes, der wegen der Notwendigkeit des Heranführens von Kraftstoff über die Zulaufleitung 3 ohnehin vorhanden ist und nur genutzt werden braucht, kann somit in eleganter Weise der Sammelraum 4 kontinuierlich geleert werden, was zur Folge hat, daß die sich im Sammelraum befindenden Kraftstoff-Dampfblasen aufgelöst und abgeführt werden.However, it is required, for example afterwards to a successful start of the internal combustion engine Steam bubbles continuously again from the collecting space 4 remove. According to the invention, this takes place via a Branch 4 branch off and end in the feed line 3 Line section 5. This line section 5 opens into the inlet line 3 like a suction jet pump, what has the consequence that the via the feed line 3 in the Injection bar 1 inflowing fuel flow Fuel volume located in the collecting space 4 - be it in vapor or liquid form - quasi suction. Under Using the suction jet pump effect, which is due to the Need to introduce fuel over the Inlet line 3 is present anyway and only used the collection room can be elegantly used 4 are emptied continuously, which means that the fuel vapor bubbles in the collecting space be dissolved and dissipated.

Dabei können grundsätzlich die Dampfblasen direkt über den saugstrahlpumpenartig ausgebildeten Leitungsabschnitt abgeführt werden, tatsächlich jedoch werden diese Dampfblasen größtenteils durch die Fähigkeit des Kraftstoffes, sowohl Luft als auch ausgedampften Kraftstoff bis zu einem gewissen Grad zu absorbieren, abgebaut. Da über die Einspritzleiste 1 stets auch frischer Kraftstoff in den Sammelraum 4 gelangt, liegt eine relativ große übergangsfläche zwischen den Dampfblasen sowie dem flüssigen Kraftstoff vor, so daß die Dampfblasen größtenteils absorbiert werden können. Im Gegensatz zur eingangs zitierten EP 0 593 053 Al wird bei der vorliegenden Einspritzleiste somit kein gasförmiger Kraftstoff abgesaugt, sondern flüssiger, mit Dampfblasen gesättigter Kraftstoff. Dabei sind die Gasanteile in diesem flüssigen, mit Dampfblasen gesättigten Kraftstoff so niedrig, daß keine Verbrennungsprobleme auftreten können. In diesem Zusammenhang ist auch wesentlich, daß die Eintrittsöffnungen der Einspritzventile 2 bezüglich der Einspritzleiste 1 geodätisch möglichst tief liegen, um ein direktes Ansaugen von Dampfblasen und die damit verbundenen Gemischbildungsbzw. Verbrennungsprobleme zu verhindern.In principle, the vapor bubbles can directly over the suction jet-like line section be dissipated, but actually these vapor bubbles largely through the ability of the fuel to both air and evaporated fuel up to absorb to some extent, degraded. Because about that Injection bar 1 always fresh fuel in the Arrives in collecting space 4, there is a relatively large transition area between the vapor bubbles as well as the liquid Fuel so that the vapor bubbles are largely absorbed can be. In contrast to the above EP 0 593 053 A1 is used in the present injection molding thus no gaseous fuel is drawn off, but liquid fuel saturated with vapor bubbles. The gas components in this are liquid, with vapor bubbles saturated fuel so low that no combustion problems may occur. In this context it is also essential that the inlet openings of the Injectors 2 geodetically with respect to the injection bar 1 as low as possible to directly suck in Steam bubbles and the associated mixture formation or To prevent burn problems.

Um nicht unnötigerweise große Kraftstoffmengen kontinuierlich aus der Einspritzleiste 1 über den Sammelraum 4 sowie den Leitungsabschnitt 5 zurück in die Einspritzleiste 1 umzuwälzen, kann im Leitungsabschnitt 5 eine geeignet dimensionierte Dosierdüse 6 vorgesehen sein. Weiterhin kann in der Zulaufleitung 3 stromab der Mündungsstelle des Leitungsabschnittes 5 ein Zerstäubungsgitter 7 vorgesehen sein, an welchem möglicherweise doch mitgerissene Dampfblasen, die aus dem Sammelraum 4 abgeführt wurden, zerkleinert bzw. aufgelöst werden. Dieses Zerstäubungsgitter 7 verhindert somit bei laufender Brennkraftmaschine, daß in die Einspritzventile 2 unzulässig große Dampfblasen gelangen können.To avoid unnecessarily large amounts of fuel continuously from the injection bar 1 via the collecting space 4 and the line section 5 back into the injection bar 1, can be suitable in line section 5 Dimensioned dosing nozzle 6 may be provided. Farther can in the feed line 3 downstream of the mouth of the line section 5 an atomizing grid 7 be provided, on which possibly entrained Vapor bubbles that have been removed from the collecting space 4, crushed or dissolved. This atomizing grille 7 thus prevents the internal combustion engine from running, that in the injectors 2 impermissibly large Steam bubbles can get.

Die Fig. 1, 2 zeigen verschiedenartige Ausführungsformen einer erfindungsgemäßen Einspritzleiste 1. Bei beiden Ausführungsformen befindet sich der Sammelraum 4 im wesentlichen geodätisch oberhalb des eigentlichen, die Einspritzventile 2 versorgenden Einspritzleisten-Abschnittes, um sicherzustellen, daß die Dampfblasen aufgrund ihres geringeren spezifischen Gewichtes auch tatsächlich in diesen Sammelraum 4 gelangen. Während beim Ausführungsbeispiel nach Fig. 1 der Sammelraum 4 als separates Volumen im der Zulaufleitung 3 gegenüberliegenden Endbereich der Einspritzleiste 1 ausgebildet ist, ist beim Ausführungsbeispiel nach Fig. 2 der Sammelraum 4 baulich mit der Einspritzleiste 1 zusammengefaßt. Lediglich eine mit Durchtrittsöffnungen 8 versehene Trennwand 9 trennt den Sammelraum 4 vom sog. Versorgungs-Abschnitt la. Dabei liegen die Durchtrittsöffnungen 8 in der Trennwand 9 im wesentlichen direkt oberhalb der Abzweigstellen der einzelnen Einspritzventile 2, jedoch kann dies sowie weitere Details insbesondere konstruktiver Art durchaus abweichend von den gezeigten Ausführungsbeispielen gestaltet sein, ohne den Inhalt der Patentansprüche zu verlassen.1, 2 show different types of embodiments an injection bar according to the invention 1. In both Embodiments, the collecting space 4 is in the essentially geodesically above the actual, the Injection valves 2 supplying injection rail section, to make sure that the vapor bubbles are due to their lower specific weight too actually get into this collecting space 4. While at 1 the collecting space 4 as a separate one Volume in the supply line 3 opposite End region of the injection bar 1 is formed 2, the collecting space 4 structurally summarized with the injection bar 1. Only a partition provided with through openings 8 9 separates the collecting space 4 from the so-called supply section la. The passage openings 8 are located in the partition 9 essentially directly above the branch points of the individual injection valves 2, however, this can as well further details, especially of a constructive nature designed differently from the exemplary embodiments shown be without leaving the content of the claims.

Claims (4)

  1. A fuel injection line of an internal combustion engine for a return flowfree fuel supply system, whereby the injection line (1) from which the injection valves (2) are supplied with fuel, is in connection with a collecting space (4), geodetically above itself and additionally is connected via a line section (5) with a fuel supply line (3) supplying the injection line (1) with fuel,
    characterised in that the line section (5) opens into the fuel supply line (3) in the manner of a flow suction pump, so as to take back fuel vapour pockets present in the collecting space (4) through it into the injection line (1).
  2. An injection line according to Claim 1,
    characterised in that the line section (5) has a dosing nozzle (6).
  3. An injection line according to Claim 1 or Claim 2,
    characterised in that downstream from the opening of the line section (5) an atomising grid (7) is provided in the supply line (3).
  4. An injection line according to one of the foregoing claims,
    characterised in that the collecting space (4) is integrated constructionally with the injection line (1) and is separated from injection line section (1a) supplying the injection valves (2) branching off by a dividing wall (9) having a through opening (8).
EP95115187A 1994-11-24 1995-09-27 Fuel injection rail with collecting space for vapour bubbles Expired - Lifetime EP0713968B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4441858 1994-11-24
DE4441858 1994-11-24

Publications (2)

Publication Number Publication Date
EP0713968A1 EP0713968A1 (en) 1996-05-29
EP0713968B1 true EP0713968B1 (en) 1998-12-30

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Application Number Title Priority Date Filing Date
EP95115187A Expired - Lifetime EP0713968B1 (en) 1994-11-24 1995-09-27 Fuel injection rail with collecting space for vapour bubbles

Country Status (3)

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EP (1) EP0713968B1 (en)
DE (1) DE59504683D1 (en)
ES (1) ES2126827T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003012274A1 (en) 2001-07-31 2003-02-13 Volkswagen Aktiengesellschaft Circuit arrangement and method for controlling an electric fuel pump in a non-return fuel delivery system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3132432A1 (en) * 1981-08-17 1983-02-24 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION SYSTEM
US4601275A (en) * 1982-08-23 1986-07-22 General Motors Corporation Fuel rail
US4732131A (en) * 1986-08-26 1988-03-22 Brunswick Corporation Fuel line purging device
US4966120A (en) * 1987-07-29 1990-10-30 Aisan Kogyo Kabushiki Kaisha Fuel injection system assembly
DE4030490C2 (en) * 1989-09-29 1999-02-04 Denso Corp Device for supplying fuel in a multi-cylinder internal combustion engine
DE4115039A1 (en) * 1991-05-08 1992-11-12 Bosch Gmbh Robert FUEL DISTRIBUTOR
JP2812102B2 (en) 1992-10-15 1998-10-22 株式会社デンソー Fuel supply device for internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003012274A1 (en) 2001-07-31 2003-02-13 Volkswagen Aktiengesellschaft Circuit arrangement and method for controlling an electric fuel pump in a non-return fuel delivery system

Also Published As

Publication number Publication date
DE59504683D1 (en) 1999-02-11
EP0713968A1 (en) 1996-05-29
ES2126827T3 (en) 1999-04-01

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