EP1658425B1 - Fuel injection unit and method for injection of fuel - Google Patents
Fuel injection unit and method for injection of fuel Download PDFInfo
- Publication number
- EP1658425B1 EP1658425B1 EP04766519A EP04766519A EP1658425B1 EP 1658425 B1 EP1658425 B1 EP 1658425B1 EP 04766519 A EP04766519 A EP 04766519A EP 04766519 A EP04766519 A EP 04766519A EP 1658425 B1 EP1658425 B1 EP 1658425B1
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- EP
- European Patent Office
- Prior art keywords
- fuel
- fuel injection
- distributor line
- injection valve
- lance
- 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.)
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Classifications
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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
- 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
- F02M63/0275—Arrangement of common rails
- F02M63/0285—Arrangement of common rails having more than one common rail
- F02M63/029—Arrangement of common rails having more than one common rail per cylinder bank, e.g. storing different fuels or fuels at different pressure levels per cylinder bank
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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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
-
- 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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
- F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
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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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/007—Cleaning
- F02M65/008—Cleaning of injectors only
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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
- 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
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
- F02M2200/505—Adjusting spring tension by sliding spring seats
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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
- 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
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
-
- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/02—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means with fuel-heating means, e.g. for vaporising
Definitions
- the invention relates to a fuel injection system for injecting fuel into an internal combustion engine according to the preamble of claim 1 and to a method for injecting fuel according to claim 10.
- GB-A-1150 043 a fuel injection system for injecting fuel into an internal combustion engine according to the preamble of claim 1 and to a method for injecting fuel according to claim 10.
- a fuel injection system is for example from the DE 101 23 867 A1 known.
- the fuel injection valve comprises an auxiliary inlet, which communicates via a line with an interior of the fuel injection valve.
- a cleaning agent or a mixture of fuel and cleaning agent can be supplied to the injection openings of the fuel injection valve via the auxiliary feed.
- the cleaning agent can be used for flushing the fuel injection valve and the injection orifices for reducing deposits.
- the fuel injection system according to the invention with the characterizing features of claim 1 and the inventive method with the characterizing features of claim 10 have the advantage that stand on two fuel distribution lines, which are connected via a conventional terminal and a lance arranged therein with the fuel injection valves, different Fuels for different operating conditions of the internal combustion engine can be fed in a simple manner.
- the second fuel distributor line runs parallel to the first and is soldered thereto, for example.
- a check valve is provided in the lance, which is freely selectable for any pressure and prevents backflow of the starting fuel or the cleaning liquid.
- the lance penetrates the first fuel distributor line, whereby an additional evaporation of the lance flowing through the fuel can be avoided.
- the starting fuel may advantageously be composed so that the cold start characteristics of the internal combustion engine can be improved, the pollutant emissions can be reduced and the fuel injection valve can be kept free from deposits.
- a fuel injection valve 2 in the form of a low-pressure fuel injection valve is for injecting fuel into the intake pipe of a mixture-compression, spark-ignited internal combustion engine suitable.
- the fuel injection valve 2 is preferably installed in a series arrangement on a cylinder head, not shown, of the internal combustion engine and connected by means of a first fuel distributor line 3 with further fuel injection valves 2, not shown.
- the measures according to the invention relate to a second fuel distributor line 4, which may be arranged in particular parallel to the first fuel distributor line 3.
- the second fuel distribution line 4 serves to supply a starting fuel, which is designed in its properties with respect to evaporation and combustion so that the cold start properties improved, the hydrocarbon emissions in the cold running phase of the engine and the nitrogen oxide emissions can be reduced.
- the starting fuel may alternatively be replaced by a cleaning or rinsing liquid for cleaning the fuel injection valve 2 between the injection cycles. Deposits in the region of the fuel channels and the injection openings of the fuel injection valve 2 are thereby washed away and can no longer lead to malfunction of the fuel injection valve 2.
- the conception is chosen so that existing fuel injectors 2 without expensive modifications for use with the inventive measures are used, whereby the cost can be kept low.
- the second fuel distributor line 4 has a preferably tubular lance 5, which extends through the first fuel distributor line 3.
- the lance 5 opens into a supply pipe 6 of the fuel injection valve 2 in this one.
- a check valve 7 is arranged, which may be formed, for example, as a ball valve 7 with a spring 8.
- the check valve 7 ensures that the injection is terminated with starting fuel as soon as normal fuel is supplied via a feed line 9 from the first fuel distributor line 3. It is interchangeable and can be selected for any pressures, for example between 0.2 and 1 bar. A detailed description of the individual components and the mode of operation can be taken from the description of FIGS. 2A to 2C.
- the lance 5 and the second fuel distributor line 4 are preferably soldered to the first fuel distributor line 3.
- the diameter of the lance 5 is for example 4 mm in order to provide a sufficient Zumeßquerrough.
- the lance 5 can also be designed to be heated in order to heat the fuel.
- an improvement of the cold start properties can also be achieved by a better evaporation and a reduction of the hydrocarbons.
- the heating elements can be embodied in various forms such as spirals or in the form of heating pills.
- a tube may be provided in connection with an outer wall of the fuel injection valve 2, through which the starting fuel to the tip of the fuel injection valve 2 can be passed.
- a further advantageous embodiment combines the use of the lance 5 with the switching between starting and normal fuel through the use of two valves, whereby the fuel circuits can be completely decoupled from each other.
- the backwashing can be done via external channels.
- the fuel types are not subject to any restrictions with regard to the feed cross sections and the maximum possible flow rate.
- FIGS. 2A to 2C show a rinsing and injection cycle for a fuel injection system 1 configured in accordance with the invention in three steps.
- the fuel injection system 1 is shown in each case in a lateral, partially cutaway in the region of the fuel injection valve 2. Only the parts of a fuel injection valve 2 essential to the invention are referred to. Incidentally, the fuel injection valve 2 may be arbitrary. Identical components are provided in all figures with matching reference numerals.
- FIG. 2A shows the rinsing process as the first step of the injection cycle.
- starting fuel is passed through an interior 10 of the fuel injection valve 2 from the second fuel distributor line 4. Since no electrical actuation of the fuel injection valve 2 takes place at this time, the starting fuel is not injected, but flows through lateral channels 11, as indicated by the arrows 12, against a Abspritzraum back to the supply pipe 6 of the fuel injection valve 2.
- the check valve 7 prevents the backflow of the starting fuel into the second fuel distribution line 4.
- the aim of the flushing process is to obtain the combustion residues from the previous injection cycle in the range To solve the valve tip 13 and rinse so that the fuel injector 2 can inject consistent amounts of fuel into the combustion chamber of the internal combustion engine.
- Fig. 2B the next step, the injection of starting fuel in the direction of a combustion chamber of the internal combustion engine, is shown.
- the starting fuel is in this case supplied in the same manner as in the rinsing process shown in Fig. 2A, but is hosed by the simultaneous electrical actuation of the fuel injection valve 2 to the combustion chamber of the internal combustion engine. This is indicated by the arrows 14 in Fig. 2B.
- the starting fuel is adjusted so that, as already explained above, the cold start behavior of the internal combustion engine positively influenced and the exhaust emissions can be reduced.
- FIG. 2C shows the third step of the injection cycle in which normal fuel from the first fuel distributor line 3 is conducted via the inlet 9 and the lateral channels 10 to the valve tip 13 and is sprayed off to the combustion chamber of the internal combustion engine.
- the normal fuel flows through the fuel injection valve 2 along the path indicated by the arrows 15 and 14. Normal fuel is sprayed as soon as the internal combustion engine has reached its operating temperature, which can be measured by a suitable sensor.
- the normal fuel can be, for example, a fuel with higher energy density, which manages without the addition of cleaning agents.
- the invention is not limited to the illustrated embodiment and, for example, also suitable for fuel injection systems 1 of mixture-compressing, self-igniting internal combustion engines.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung geht aus von einer Brennstoffeinspritzanlage zum Einspritzen von Brennstoff in eine Brennkraftmaschine nach der Gattung des Anspruchs 1 und von einem Verfahren zum Einspritzen von Brennstoff gemäß Anspruch 10 (
Eine Brennstoffeinspritzanlage nach dem Oberbegriff des Anspruchs 1 ist beispielsweise aus der
Nachteilig an der in der obengenannten Druckschrift beschriebenen Anordnung ist insbesondere, daß jedes der Brennstoffeinspritzventile einer Brennkraftmaschine mit einem entsprechenden Zulauf versehen werden muß, welcher zudem dezentral vom Brennstoffzulauf der Brennstoffeinspritzventile angeordnet ist. Der Herstellungsaufwand ist somit sehr hoch. Zudem muß eine zweite Zuleitung, welche die Hilfszuläufe miteinander verbindet, verlegt werden, was zusätzlichen Aufwand an Bauteilen und Montagezeit kostet.A disadvantage of the arrangement described in the above publication is in particular that each of the fuel injection valves of an internal combustion engine must be provided with a corresponding inlet, which also decentralized from the fuel inlet Fuel injection valves is arranged. The production cost is therefore very high. In addition, a second supply line, which connects the auxiliary inlets with each other, must be laid, which costs additional expenditure of components and assembly time.
Die erfindungsgemäße Brennstoffeinspritzanlage mit den kennzeichnenden Merkmalen des Anspruchs 1 und das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Anspruchs 10 haben demgegenüber den Vorteil, daß über zwei Brennstoffverteilerleitungen, welche über einen konventionellen Anschluß und über eine darin angeordnete Lanze mit den Brennstoffeinspritzventilen in Verbindung stehen, verschiedene Brennstoffe für verschiedene Betriebszustände der Brennkraftmaschine auf einfache Weise zuleitbar sind.The fuel injection system according to the invention with the characterizing features of claim 1 and the inventive method with the characterizing features of
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Brennstoffeinspritzanlage möglich.The measures listed in the dependent claims advantageous refinements and improvements of claim 1 fuel injection system are possible.
Von Vorteil ist dabei insbesondere, daß die zweite Brennstoffverteilerleitung parallel zu der ersten verläuft und mit dieser beispielsweise verlötet ist.It is particularly advantageous in this case that the second fuel distributor line runs parallel to the first and is soldered thereto, for example.
Weiterhin ist von Vorteil, daß serienmäßige Brennstoffeinspritzventile ohne kostspielige Modifikationen mit der doppelten Brennstoffverteilerleitung verwendbar sind.It is also advantageous that standard fuel injectors can be used without costly modifications to the dual fuel rail.
Vorteilhafterweise ist in der Lanze ein Rückschlagventil vorgesehen, welches für einen beliebigen Druck frei wählbar ist und ein Rückströmen des Startbrennstoffs oder der Reinigungsflüssigkeit verhindert.Advantageously, a check valve is provided in the lance, which is freely selectable for any pressure and prevents backflow of the starting fuel or the cleaning liquid.
Zudem ist vorteilhaft, daß die Zuleitung des Startbrennstoffs auch über eine äußere Hülse außen am Brennstoffeinspritzventil oder durch eine von der Hauptzuleitung entkoppelte weitere Zuleitung erfolgen kann.In addition, it is advantageous that the supply of the starting fuel via an outer sleeve on the outside Fuel injection valve or can be done by a decoupled from the main supply further supply line.
Weiterhin ist vorteilhaft, daß die Lanze die ersten Brennstoffverteilerleitung durchgreift, wodurch eine zusätzliche Evaporation des die Lanze durchströmenden Brennstoffs vermieden werden kann.Furthermore, it is advantageous that the lance penetrates the first fuel distributor line, whereby an additional evaporation of the lance flowing through the fuel can be avoided.
Der Startbrennstoff kann vorteilhafterweise so zusammengesetzt sein, daß die Kaltstarteigenschaften der Brennkraftmaschine verbessert, die Schadstoffemission verringert und das Brennstoffeinspritzventil frei von Ablagerungen gehalten werden kann.The starting fuel may advantageously be composed so that the cold start characteristics of the internal combustion engine can be improved, the pollutant emissions can be reduced and the fuel injection valve can be kept free from deposits.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1
- einen schematischen Schnitt durch ein Ausführungsbeispiel einer erfindungsgemäßen Brennstoffeinspritzanlage in einer Gesamtdarstellung,
- Fig. 2A-C
- seitliche Ansichten durch ein teilgeschnittenes Brennstoffeinspritzventil der in Fig. 1 dargestellten Brennstoffeinspritzanlage in drei aufeinanderfolgenden Verfahrensschritten der Einspritzung.
- Fig. 1
- 3 shows a schematic section through an embodiment of a fuel injection system according to the invention in an overall representation,
- Fig. 2A-C
- side views through a partially sectional fuel injection valve of the fuel injection system shown in Fig. 1 in three successive steps of the injection.
Fig. 1 zeigt in einer schematischen Ansicht ein Ausführungsbeispiel einer erfindungsgemäß ausgestalteten Brennstoffeinspritzanlage 1. Ein Brennstoffeinspritzventil 2 in Form eines Niederdruck-Brennstoffeinspritzventils ist zum Einspritzen von Brennstoff in das Ansaugrohr einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine geeignet. Es werden im Folgenden nur diejenigen Bauteile erläutert, die in direktem Zusammenhang mit den erfindungsgemäßen Maßnahmen stehen.1 shows a schematic view of an exemplary embodiment of a fuel injection system 1 designed according to the invention. A
Das Brennstoffeinspritzventil 2 ist vorzugsweise in einer Reihenanordnung an einem nicht weiter dargestellten Zylinderkopf der Brennkraftmaschine eingebaut und mittels einer ersten Brennstoffverteilerleitung 3 mit weiteren, nicht dargestellten Brennstoffeinspritzventilen 2 verbunden. Die erfindungsgemäßen Maßnahmen beziehen sich auf eine zweite Brennstoffverteilerleitung 4, welche insbesondere parallel zu der ersten Brennstoffverteilerleitung 3 angeordnet sein kann.The
Die zweite Brennstoffverteilerleitung 4 dient dabei der Zufuhr eines Startbrennstoffes, welcher in seinen Eigenschaften bezüglich Verdampfung und Verbrennung so konzipiert ist, daß die Kaltstarteigenschaften verbessert, der Kohlenwasserstoffausstoß in der Kaltlaufphase der Brennkraftmaschine sowie die Stickoxydemission reduziert werden können. Der Startbrennstoff kann alternativ auch durch eine Reinigungs- oder Spülflüssigkeit zur Reinigung des Brennstoffeinspritzventils 2 zwischen den Einspritzzyklen ersetzt werden. Ablagerungen im Bereich der Brennstoffkanäle und der Abspritzöffnungen des Brennstoffeinspritzventils 2 werden dadurch weggespült und können nicht mehr zu Fehlfunktionen des Brennstoffeinspritzventils 2 führen.The second
Die Konzeptionierung ist dabei so gewählt, daß vorhandene Brennstoffeinspritzventile 2 ohne teure Modifikationen zur Anwendung mit den erfindungsgemäßen Maßnahmen verwendbar sind, wodurch die Kosten niedrig gehalten werden können.The conception is chosen so that existing
Die zweite Brennstoffverteilerleitung 4 weist zu diesem Zweck eine vorzugsweise rohrförmige Lanze 5 auf, welche sich durch die erste Brennstoffverteilerleitung 3 erstreckt. Die Lanze 5 mündet in einem Zuleitungsstutzen 6 des Brennstoffeinspritzventils 2 in dieses ein.For this purpose, the second
In der Lanze 5 ist ein Rückschlagventil 7 angeordnet, welches beispielsweise als Kugelventil 7 mit einer Feder 8 ausgebildet sein kann. Das Rückschlagventil 7 sorgt dafür, daß die Einspritzung mit Startbrennstoff beendet wird, sobald normaler Brennstoff über eine Zuleitung 9 aus der ersten Brennstoffverteilerleitung 3 zugeführt wird. Es ist auswechselbar und kann für beliebige Drücke beispielsweise zwischen 0,2 und 1 bar ausgewählt werden. Eine genaue Beschreibung der einzelnen Bauteile und der Funktionsweise ist der Beschreibung zu den Fig. 2A bis 2C zu entnehmen.In the
Die Lanze 5 und die zweite Brennstoffverteilerleitung 4 sind vorzugsweise mit der ersten Brennstoffverteilerleitung 3 verlötet. Der Durchmesser der Lanze 5 beträgt beispielsweise 4 mm, um einen ausreichenden Zumeßquerschnitt zu bieten.The
Durch die Durchführung der Lanze 5 durch die erste Brennstoffverteilerleitung 3 kann eine Zusatzevaporation des Startbrennstoffs vermieden werden.By carrying out the
Weiterhin kann die Lanze 5 auch beheizbar ausgeführt sein, um den Brennstoff zu erwärmen. Damit kann ebenfalls eine Verbesserung der Kaltstarteigenschaften durch eine bessere Verdampfung und eine Reduktion der Kohlenwasserstoffe erzielt werden. Die Heizelemente können dabei in verschiedenen Formen wie Spiralen oder in Form von Heizpillen ausgeführt sein.Furthermore, the
Anstelle der Lanze 5 kann auch ein Rohr in Verbindung mit einer Außenwand des Brennstoffeinspritzventils 2 vorgesehen sein, durch welches der Startbrennstoff zur Spitze des Brennstoffeinspritzventils 2 geleitet werden kann. Vorteil dabei ist, daß sich die Umschaltstelle zwischen Startbrennstoff und Normalbrennstoff im Bereich der Ventilspitze befindet und dort nach dem Umschalten nur ein geringes Restvolumen der anderen Brennstoffsorte vorliegt, wodurch sich die Startemissionen verbessern. Auch hier sind serienmäßig gefertigte Brennstoffeinspritzventile 2 mit geringfügigen Modifikationen verwendbar.Instead of the
Eine weitere vorteilhafte Ausgestaltung verbindet die Verwendung der Lanze 5 mit der Umschaltung zwischen Start-und Normalbrennstoff durch die Verwendung von zwei Ventilen, wodurch die Brennstoffkreisläufe vollständig voneinander entkoppelt werden können. Die Rückspülung kann über äußere Kanäle erfolgen. Die Brennstoffsorten unterliegen hierbei keinerlei Einschränkungen hinsichtlich der Zuführungsquerschnitte und der maximal möglichen Durchflußmenge.A further advantageous embodiment combines the use of the
Fig. 2A bis 2C zeigen einen Spül- und Einspritzzyklus für eine erfindungsgemäß ausgestaltete Brennstoffeinspritzanlage 1 in drei Schritten. Die Brennstoffeinspritzanlage 1 ist dabei jeweils in einer seitlichen, im Bereich des Brennstoffeinspritzventils 2 teilgeschnittenen Ansicht dargestellt. Es wird nur auf die für die Erfindung wesentlichen Teile eines Brennstoffeinspritzventils 2 Bezug genommen. Im übrigen kann das Brennstoffeinspritzventil 2 beliebig ausgeführt sein. Gleiche Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen.FIGS. 2A to 2C show a rinsing and injection cycle for a fuel injection system 1 configured in accordance with the invention in three steps. The fuel injection system 1 is shown in each case in a lateral, partially cutaway in the region of the
Fig. 2A zeigt als ersten Schritt des Einspritzzyklus den Spülvorgang. Hierbei wird aus der zweiten Brennstoffverteilerleitung 4 Startbrennstoff durch einen Innenraum 10 des Brennstoffeinspritzventils 2 geleitet. Da zu diesem Zeitpunkt keine elektrische Betätigung des Brennstoffeinspritzventils 2 erfolgt, wird der Startbrennstoff nicht eingespritzt, sondern fließt durch seitliche Kanäle 11, wie durch die Pfeile 12 angedeutet, entgegen einer Abspritzrichtung zurück zum Zuleitungsstutzen 6 des Brennstoffeinspritzventils 2. Das Rückschlagventil 7 verhindert dabei das Zurückströmen des Startbrennstoffs in die zweite Brennstoffverteilerleitung 4.FIG. 2A shows the rinsing process as the first step of the injection cycle. In this case, starting fuel is passed through an interior 10 of the
Ziel des Spülvorgangs ist es, die vom vorhergehenden Einspritzzyklus stammenden Verbrennungsrückstände im Bereich der Ventilspitze 13 zu lösen und auszuspülen, damit das Brennstoffeinspritzventil 2 gleichbleibende Brennstoffmengen in den Brennraum der Brennkraftmaschine einspritzen kann.The aim of the flushing process is to obtain the combustion residues from the previous injection cycle in the range To solve the
In Fig. 2B ist der nächste Schritt, das Einspritzen von Startbrennstoff in Richtung eines Brennraums der Brennkraftmaschine, dargestellt. Der Startbrennstoff wird hierbei in gleicher Weise zugeleitet wie bei dem in Fig. 2A dargestellten Spülvorgang, wird jedoch durch die gleichzeitige elektrische Betätigung des Brennstoffeinspritzventils 2 zum Brennraum der Brennkraftmaschine hin abgespritzt. Dies ist durch die Pfeile 14 in Fig. 2B angedeutet. Der Startbrennstoff ist dabei so abgestimmt, daß, wie weiter oben bereits erläutert, das Kaltstartverhalten der Brennkraftmaschine positiv beeinflußt und die Abgasemissionen vermindert werden können.In Fig. 2B, the next step, the injection of starting fuel in the direction of a combustion chamber of the internal combustion engine, is shown. The starting fuel is in this case supplied in the same manner as in the rinsing process shown in Fig. 2A, but is hosed by the simultaneous electrical actuation of the
Fig. 2C zeigt schließlich den dritten Schritt des Einspritzzyklus, bei welchem Normalbrennstoff aus der ersten Brennstoffverteilerleitung 3 über den Zulauf 9 und die seitlichen Kanäle 10 zur Ventilspitze 13 geleitet und zum Brennraum der Brennkraftmaschine hin abgespritzt wird. Der Normalbrennstoff durchfließt dabei das Brennstoffeinspritzventil 2 entlang des durch die Pfeile 15 und 14 gekennzeichneten Wegs. Normalbrennstoff wird abgespritzt, sobald die Brennkraftmaschine ihre Betriebstemperatur erreicht hat, was durch einen geeigneten Sensor gemessen werden kann. Der Normalbrennstoff kann dabei beispielsweise ein Brennstoff mit höherer Energiedichte sein, welcher dafür ohne den Zusatz von Reinigungsstoffen auskommt.Finally, FIG. 2C shows the third step of the injection cycle in which normal fuel from the first
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und beispielsweise auch für Brennstoffeinspritzanlagen 1 von gemischverdichtenden, selbstzündenden Brennkraftmaschinen geeignet.The invention is not limited to the illustrated embodiment and, for example, also suitable for fuel injection systems 1 of mixture-compressing, self-igniting internal combustion engines.
Claims (10)
- Fuel injection system (1) for injecting fuel into an internal combustion engine having at least one fuel injection valve (2), having a first fuel distributor line (3) which is connected to each fuel injection valve (2), and having a second fuel distributor line (4) which is connected to each of the fuel injection valves (2),
characterized
in that lances (5) for connecting to the fuel injection valves (2) are provided on the second fuel distributor line (4), and each lance (5) penetrates through the first fuel distributor line (3). - Fuel injection system according to Claim 1,
characterized
in that the second fuel distributor line (4) is arranged parallel to the first fuel distributor line (3). - Fuel injection system according to Claim 2,
characterized
in that the second fuel distributor line (4) is connected to the first fuel distributor line (3) by means of soldering. - Fuel injection system according to one of Claims 1 to 3,
characterized
in that each lance (5) is connected to the second fuel distributor line (4) by means of soldering. - Fuel injection system according to one of Claims 1 to 4,
characterized
in that each lance (5) extends into a feed line connector (6) of the fuel injection valve (2). - Fuel injection system according to one of Claims 1 to 5,
characterized
in that the lance (5) has a diameter of approximately 4 mm. - Fuel injection system according to one of Claims 1 to 6,
characterized
in that a non-return valve (7) is arranged in the lance (5). - Fuel injection system according to Claim 7,
characterized
in that the non-return valve (7) is embodied as a ball valve (7) with a spring (8). - Fuel injection system according to one of Claims 1 to 8,
characterized
in that the fuel injection valve (2) is connected to the first fuel distributor line (3) by means of an inflow (9). - Method for injecting fuel by means of a fuel injection system (1) into an internal combustion engine having at least one fuel injection valve (2) and a first fuel distributor line (3) which is connected to each fuel injection valve (2), and a second fuel distributor line (4) which is connected to each of the fuel injection valves (2),
characterized
in that the method comprises the following method steps:- feeding starting fuel into the fuel injection valve (2) via the second fuel distributor line (4) and a lance (5), which is provided on said second fuel distributor line (4) and penetrates through the first fuel distributor line (3), and flushing the fuel injection valve (2) ;- feeding starting fuel into the fuel injection valve (2) via the second fuel distributor line (4) and the lance (5) and simultaneously actuating the fuel injection valve (2) in order to inject the starting fuel into the combustion chamber of the internal combustion engine;- repeating the first two method steps until the operating temperature of the internal combustion engine is reached; and- feeding normal fuel into the fuel injection valve (2) via the first fuel distributor line (3) and an inflow (9) and simultaneously actuating the fuel injection valve (2) in order to inject the normal fuel into the combustion chamber of the internal combustion engine.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10337893A DE10337893A1 (en) | 2003-08-18 | 2003-08-18 | Fuel injection system and method for injecting fuel |
PCT/EP2004/051818 WO2005019636A1 (en) | 2003-08-18 | 2004-08-18 | Fuel injection unit and method for injection of fuel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1658425A1 EP1658425A1 (en) | 2006-05-24 |
EP1658425B1 true EP1658425B1 (en) | 2008-01-16 |
Family
ID=34201627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04766519A Expired - Fee Related EP1658425B1 (en) | 2003-08-18 | 2004-08-18 | Fuel injection unit and method for injection of fuel |
Country Status (5)
Country | Link |
---|---|
US (1) | US7523740B2 (en) |
EP (1) | EP1658425B1 (en) |
JP (1) | JP4550819B2 (en) |
DE (2) | DE10337893A1 (en) |
WO (1) | WO2005019636A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7861696B2 (en) * | 2005-11-26 | 2011-01-04 | Exen Holdings, Llc | Multi fuel co-injection system for internal combustion and turbine engines |
US8333171B2 (en) * | 2009-02-06 | 2012-12-18 | Exen Holdings, Llc | Homogenizing fuel enhancement system |
BRPI1005341B1 (en) | 2010-12-02 | 2016-12-20 | Bosch Do Brasil | plastic fuel tank with heating system |
US8596561B2 (en) | 2011-08-31 | 2013-12-03 | Caterpillar Inc. | Dual fuel injector with hydraulic lock seal |
JP6254403B2 (en) * | 2013-09-20 | 2017-12-27 | 株式会社デンソー | Fuel heating system and fuel rail using the same |
JP6274799B2 (en) * | 2013-09-20 | 2018-02-07 | 株式会社デンソー | Fuel heating system and fuel rail using the same |
EP3341605A4 (en) * | 2015-08-27 | 2019-05-08 | Westport Power Inc. | Deposit mitigation for gaseous fuel injectors |
US9771887B2 (en) * | 2015-11-23 | 2017-09-26 | Ford Global Technologies, Llc | Single rail combined fuel injection |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL36160C (en) | 1933-05-22 | |||
DE849325C (en) | 1940-09-19 | 1952-09-15 | Bosch Gmbh Robert | Injection valve for internal combustion engines |
DE969853C (en) | 1952-12-25 | 1958-07-24 | Maschf Augsburg Nuernberg Ag | Device for using different types and amounts of fuel in injection nozzles of internal combustion engines |
GB1150043A (en) * | 1967-03-13 | 1969-04-30 | Caterpillar Tractor Co | A Compression Ignition Engine Fuel System |
DE3243176A1 (en) * | 1982-11-23 | 1984-05-24 | Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln | INJECTION DEVICE FOR ALCOHOL FUELS, ESPECIALLY FOR DIRECT INJECTING DIESEL ENGINES |
JPH0323656U (en) * | 1989-07-18 | 1991-03-12 | ||
ES2117897T3 (en) * | 1996-02-16 | 1998-08-16 | Fiat Ricerche | INTERNAL COMBUSTION ENGINE WITH METHANE INJECTION SYSTEM. |
JP3778385B2 (en) * | 1996-10-03 | 2006-05-24 | 臼井国際産業株式会社 | Common rail |
US5887799A (en) * | 1997-09-11 | 1999-03-30 | Impco Technoligies, Inc. | Dual fuel injector |
DE19746491A1 (en) * | 1997-10-22 | 1999-04-29 | Bosch Gmbh Robert | Dual fluid injection system for diesel engine of vehicle |
US6604510B2 (en) * | 2000-10-04 | 2003-08-12 | Siemens Automotive Corporation | Fuel system including a fuel injector directly mounted to a fuel rail |
DE10123867A1 (en) | 2001-05-16 | 2002-11-28 | Bosch Gmbh Robert | Fuel injector |
JP2003056425A (en) * | 2001-08-21 | 2003-02-26 | Aisan Ind Co Ltd | Fuel injection system for internal combustion engine |
US6886537B2 (en) * | 2002-07-04 | 2005-05-03 | Denso Corporation | Accumulation type fuel injection system for engine |
US7077101B2 (en) * | 2002-08-14 | 2006-07-18 | Electro-Motive Diesel, Inc. | Hybrid fuel injection system |
JP4021838B2 (en) * | 2003-09-02 | 2007-12-12 | 株式会社日立製作所 | Fuel injection device |
-
2003
- 2003-08-18 DE DE10337893A patent/DE10337893A1/en not_active Withdrawn
-
2004
- 2004-08-18 JP JP2006523634A patent/JP4550819B2/en not_active Expired - Fee Related
- 2004-08-18 EP EP04766519A patent/EP1658425B1/en not_active Expired - Fee Related
- 2004-08-18 US US10/566,862 patent/US7523740B2/en not_active Expired - Fee Related
- 2004-08-18 WO PCT/EP2004/051818 patent/WO2005019636A1/en active IP Right Grant
- 2004-08-18 DE DE502004005973T patent/DE502004005973D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
US20070169749A1 (en) | 2007-07-26 |
DE502004005973D1 (en) | 2008-03-06 |
JP4550819B2 (en) | 2010-09-22 |
US7523740B2 (en) | 2009-04-28 |
DE10337893A1 (en) | 2005-03-17 |
JP2007502930A (en) | 2007-02-15 |
WO2005019636A1 (en) | 2005-03-03 |
EP1658425A1 (en) | 2006-05-24 |
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