EP0465613B1 - Fuel-injection system for internal-combustion engines - Google Patents

Fuel-injection system for internal-combustion engines Download PDF

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Publication number
EP0465613B1
EP0465613B1 EP91901681A EP91901681A EP0465613B1 EP 0465613 B1 EP0465613 B1 EP 0465613B1 EP 91901681 A EP91901681 A EP 91901681A EP 91901681 A EP91901681 A EP 91901681A EP 0465613 B1 EP0465613 B1 EP 0465613B1
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EP
European Patent Office
Prior art keywords
fuel injection
fuel
inlet
plug
sockets
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
EP91901681A
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German (de)
French (fr)
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EP0465613A1 (en
Inventor
Udo Hafner
Ferdinand Reiter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0465613A1 publication Critical patent/EP0465613A1/en
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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 system for internal combustion engines of the type defined in the preamble of claim 1.
  • a fuel injection system US-A-4 570 601
  • the electromagnetically controlled fuel injection valves are controlled by an electronic control unit as a function of operating parameters of the internal combustion engine, such as intake air quantity, load, temperature, etc., which bring about a corresponding metering of the fuel injection quantity.
  • the electrical connections connected to the electromagnets of the fuel injection valves in the form of plug-in elements which protrude laterally on the valve housing are contacted when the fuel injector inlet connecting piece is inserted into connecting pieces of a fuel distributor with plug-in elements arranged on the connecting piece and thus connected to the control unit.
  • the lateral arrangement of the plug-in elements on the fuel injection valve and fuel distributor leads to an asymmetrical design requiring additional installation space.
  • the fuel injection system according to the invention with the features of claim 1 has the advantage that even in fuel injection systems with so-called top-feed valves, in which the plug-in elements protrude laterally from the valve housing due to the fuel supply at the end, fuel distributors and fuel injection valves form a compact unit which requires little installation space can be summarized.
  • FIG. 1 shows a perspective illustration of a fuel distributor with fuel injection valves of a fuel injection system for an internal combustion engine inserted therein
  • FIG. 2 shows a detail of a side view of a fuel distributor
  • FIG. 3 shows a detail of a bottom view of the fuel distributor in FIG. 2
  • FIG. 4 shows a section along the line IV-IV in FIG 2 with fuel injection valves inserted in the fuel distributor
  • FIG. 5 shows the same representation as in FIG. 4 of a modified fuel distributor.
  • the fuel injection system for an internal combustion engine which is only partially shown in FIG. 1, has a fuel distributor 110, in the plastic housing 111 of which a distributor channel 112 (FIGS. 4 and 5) is formed, which at the ends of the plastic housing 111 in a connecting mouthpiece 13 for the fuel supply and in one Connection mouthpiece 14 opens for the fuel drain.
  • the connection mouthpiece 13 is connected via a fuel supply line to a fuel pump (not shown) which delivers fuel from a fuel tank.
  • the mouthpiece 14 is connected to the fuel tank via a return line, also not shown.
  • a pressure control valve 15 is arranged, which regulates the fuel pressure in the distributor channel 112 to a predetermined value.
  • the plastic housing 111 carries on its underside four connecting pieces 116, each with one Mouth opening 117 ( Figure 4) are connected to the distribution channel 112.
  • the number of connecting pieces 116 corresponds to the number of combustion cylinders of the internal combustion engine.
  • the fuel injection system also has - corresponding to the number of combustion cylinders of the internal combustion engine - four fuel injection valves 118 of the so-called top-feed type.
  • Each of these electromagnetically actuated fuel injection valves 118 has a valve housing 119 with an inlet connection 120 (FIGS. 4 and 5) formed at one end, which has a fuel inlet opening opening at its free end.
  • inlet connection 120 With this inlet connection 120, each fuel injection valve 118 is inserted in a connection stub 116 on the underside of the fuel distributor 110 in a liquid-tight manner, the fuel inlet opening in the inlet connection 120 being connected to the distribution channel 112 via the opening 117 in the connection stub 116.
  • the fuel injection valves 118 each have an electromagnet (not shown here), the power supply of which is provided via two electrical plug-in elements 121, 122 (FIGS. 4 and 5) which project laterally on the valve housing 119 near the inlet connector 120.
  • the plug elements 121, 122 have a rectangular cross section.
  • a number of electrical plug sockets 126, 127 are integrated in the plastic housing 111 of the fuel distributor 110 and are designed to accommodate the plug elements 121, 122 in a corresponding manner.
  • Each two sockets 126, 127 are spatially assigned to a connecting piece 116 so that when inserting the inlet piece 120 of a fuel injector 118 into the connecting piece 116, the plug elements 121, 122 simultaneously penetrate into the associated sockets 126, 127.
  • All sockets 126, 127 are individually connected to a multi-pin connector 30, which is attached to one end face of the plastic housing 111, via electrical connecting cables running in the plastic housing 111 of the fuel distributor 110.
  • the electronic control unit for controlling the fuel injection valves 118 is connected to the connector 30 via a multi-wheel cable.
  • the electronic control unit for controlling the fuel injection valves 118 is connected to the connector 30 via a multi-wheel cable.
  • the fuel distributor 110 with the fuel injection valves 118 inserted therein can be assembled on the internal combustion engine as a completely prefabricated and final-checked structural unit, the injection orifices 32 of the fuel injection valves 118 each protruding into an intake pipe of the internal combustion engine.
  • FIGS. 2 to 4 An exemplary embodiment of a fuel distributor 110 is shown in FIGS. 2 to 4.
  • the distribution channel 112 is formed in the plastic housing 111 and communicates with a plurality of connecting pieces 116 via outlet openings 117.
  • the rotationally symmetrical connecting pieces 116 are integrally formed on the elongated box-shaped plastic housing 111 and protrude on the underside thereof (FIGS. 2 and 3).
  • Ears 134 formed on the plastic housing 111 with fastening holes 135 serve to fasten the completely pre-assembled fuel distributor 110 to the internal combustion engine.
  • each connector 116 near the insertion opening 136 for the inlet 120 of the fuel injection valves 118 two diametrically arranged pockets 137, 138 are provided, which run through the connector 116 and the plastic housing 111 and are open towards the top of the plastic housing 111 facing away from the connector 116.
  • the pockets 137, 138 are each provided with a slot 139, 140 which is designed such that an electrical plug element 121 or 122 on the fuel injection valve 118 can pass through.
  • a plug socket 126, 127 is inserted coaxially to the slot 139 or 140 in each pocket 137 or 138 and secured against axial displacement in the lower part of the pocket by a catch.
  • the connector socket 126 or 127 has on one rear side a spring tongue 141 or 142 which engages behind a latching lug 143 or 144 in the pocket 137, 138.
  • the end of the plug socket 126 or 127 facing away from the slot 139 or 140 is connected to a connecting line 145 or 146 which leads to a connector provided on the side of the plastic housing 111.
  • the pockets 137 and 138 are covered by a cover rail 147, which is clipped into the plastic housing 111 by means of catches 148 provided on the top of the pockets on the plastic housing 111.
  • Each catch 148 consists of two mutually opposite catch ribs 149, 150 which project from lateral webs 168, 169 of the cover rail 147 projecting into the pockets 137, 138 and each have an insertion bevel 151 and a catch projection 152 in the usual manner. With this latching projection 152, the latching ribs 149, 150 engage behind corresponding projections 153 on the opposite pocket wall.
  • a groove 154 is provided in each longitudinal web 168, 169 of the cover rail 147, in which each contains a seal 155.
  • Each connecting piece 116 has at its end having the insertion opening 136 for the inlet connection 120 of the fuel injection valves 118 an axially projecting locking collar 156 for mechanically locking the fuel injection valve 118 inserted into the insertion opening 136.
  • each electromagnetic fuel injection valve 118 of the so-called top-feed type has a valve housing 119 with an inlet connection 120 formed at the end, which has a fuel inlet opening 157 opening at its free end.
  • a plastic hood 158 which coaxially surrounds the inlet connection 120 with a hub-like projection 161 and carries a radially protruding locking flange 159, is firmly attached to the front end of the valve housing 119.
  • the two plug-in elements 121, 122 emerge freely from the annular surface 160 of the locking flange 159 facing the inlet connection 120 and extend diametrically to one another parallel to and at a distance from the inlet connection 120.
  • each plug-in element 121, 122 is electrically conductively connected to a winding end of an excitation winding of an electromagnet for valve actuation .
  • the fuel injection valve 118 with its inlet connection 120 and the hub-like projection 161 of the plastic hood 158 surrounding it is pushed into the insertion opening 136 in the connection nozzle 116, the two plug elements 121, 122 through the slots 139, 140 in the annular surface 162 surrounding the insertion opening 136 on the connection nozzle 116 step through and insert into the assigned sockets 126, 127.
  • the locking collar 156 snaps behind the locking flange 159 and secures this through Plug-in elements 121, 122 and sockets 126, 127 rotatably held in the connecting piece 116 fuel injector 118 against unwanted axial displacement.
  • an annular flat seal 163 is inserted between the annular surface 160 on the locking flange 159 and the annular surface 162 on the connecting piece 116.
  • An O-ring seal 164 which lies on the end face of the hub-like projection 161 of the plastic hood 158 and surrounds the inlet connector 120, prevents fuel from escaping from the connector 116.
  • a filter basket 165 is inserted in each inlet connector 120.
  • the modified fuel distributor 110 shown in cross section in FIG. 5 differs from the fuel distributor 110 shown in FIG. 4 and described above only in that a filter duct 166 is arranged toward the distributor duct 112, in which a filter 167 is interchangeably inserted. This eliminates the need to insert filter baskets 165 into each individual inlet connection 120 of the fuel injection valves 118. Otherwise, all of the components of the fuel distributor 110 in FIG. 5 match the components of the fuel distributor 110 according to FIG. 4.

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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)

Abstract

The fuel-injection system described has a multiplicity of valves (18) of the top-feed type and a fuel distributor (10) with a channel (12) inside a plastic housing (11) and with a connection piece (16) designed to hold at the end a feed connection (20) on the injection valve (18). To simplify manufacture and assembly of the valves (18), and to protect them against torsional distortion, electrical sockets (26, 27) designed to accommodate matching electrical plug elements (21, 22) on the valves (18) are integrated in the fuel distributor housing (11). Two sockets (26, 27) are associated with each connection (16) such that, when the valve (18) is inserted in the connection piece (16), the plug elements (21, 22) penetrate at the same time into their associated plug sockets (26, 27). All the plug sockets (26, 27) are electrically connected to a multipole plug (30) mounted on the fuel distributor (10), the multipole plug being connected to the electrical valve-control unit.

Description

Die Erfindung betrifft ein Kraftstoffeinspritzsystem für Brennkraftmaschinen der im Oberbegriff des Patentanspruchs 1 definierten Gattung. Bei einem solchen bekannten Kraftstoffeinspritzsystem (US-A-4 570 601) werden die elektromagnetisch gesteuerten Kraftstoffeinspritzventile von einem elektronischen Steuergerät in Abhängigkeit von Betriebskenngrößen der Brennkraftmaschine, wie Ansaugluftmenge, Last, Temperatur etc. gesteuert, die eine entsprechende Dosierung der Kraftstoffeinspritzmenge bewirken. Hierzu werden die mit den Elektromagneten der Kraftstoffeinspritzventile verbundenen elektrischen Anschlüsse in Form von Steckelementen, die am Ventilgehäuse seitlich vorstehen, beim Einschieben der Kraftstoffeinspritzventil-Zulaufstutzen in Anschlußstutzen eines Kraftstoffverteilers zugleich mit an dem Anschlußstutzen angeordneten Steckelementen kontaktiert und damit an das Steuergerät angeschlossen. Die seitliche Anordnung der Steckelemente am Kraftstoffeinspritzventil und Kraftstoffverteiler führt zu einer asymmetrischen zusätzlichen Bauraum benötigenden Ausbildung.The invention relates to a fuel injection system for internal combustion engines of the type defined in the preamble of claim 1. In such a known fuel injection system (US-A-4 570 601), the electromagnetically controlled fuel injection valves are controlled by an electronic control unit as a function of operating parameters of the internal combustion engine, such as intake air quantity, load, temperature, etc., which bring about a corresponding metering of the fuel injection quantity. For this purpose, the electrical connections connected to the electromagnets of the fuel injection valves in the form of plug-in elements which protrude laterally on the valve housing are contacted when the fuel injector inlet connecting piece is inserted into connecting pieces of a fuel distributor with plug-in elements arranged on the connecting piece and thus connected to the control unit. The lateral arrangement of the plug-in elements on the fuel injection valve and fuel distributor leads to an asymmetrical design requiring additional installation space.

Das erfindungsgemäße Kraftstoffeinspritzsystem mit den Merkmalen des Patentanspruchs 1 hat den Vorteil, daß auch bei Kraftstoffeinspritzsystemen mit sog. top-feed-Ventilen, bei welchen die Steckelemente wegen der stirnseitigen Kraftstoffversorgung seitlich vom Ventilgehäuse wegstehen, Kraftstoffverteiler und Kraftstoffeinspritzventile zu einer kompakten und geringen Bauraum benötigenden Baueinheit zusammengefaßt werden können.The fuel injection system according to the invention with the features of claim 1 has the advantage that even in fuel injection systems with so-called top-feed valves, in which the plug-in elements protrude laterally from the valve housing due to the fuel supply at the end, fuel distributors and fuel injection valves form a compact unit which requires little installation space can be summarized.

Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Patentanspruch 1 angegebenen Kraftstoffeinspritzsystems möglich.Advantageous further developments and improvements of the fuel injection system specified in claim 1 are possible through the measures listed in the further claims.

Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine perspektivische Darstellung eines Kraftstoffverteilers mit darin eingesetzten Kraftstoffeinspritzventilen eines Kraftstoffeinspritzsystems für eine Brennkraftmaschine, Figur 2 ausschnittweise eine Seitenansicht eines Kraftstoffverteilers, Figur 3 ausschnittweise eine Unteransicht des Kraftstoffverteilers in Figur 2, Figur 4 einen Schnitt längs der Linie IV-IV in Figur 2 bei in den Kraftstoffverteiler eingesetzten Kraftstoffeinspritzventilen, Figur 5 eine gleiche Darstellung wie in Figur 4 eines modifizierten Kraftstoffverteilers.The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawing. FIG. 1 shows a perspective illustration of a fuel distributor with fuel injection valves of a fuel injection system for an internal combustion engine inserted therein, FIG. 2 shows a detail of a side view of a fuel distributor, FIG. 3 shows a detail of a bottom view of the fuel distributor in FIG. 2, and FIG. 4 shows a section along the line IV-IV in FIG 2 with fuel injection valves inserted in the fuel distributor, FIG. 5 shows the same representation as in FIG. 4 of a modified fuel distributor.

Das in Figur 1 nur teilweise dargestellte Kraftstoffeinspritzsystem für eine Brennkraftmaschine weist einen Kraftstoffverteiler 110 auf, in dessen Kunststoffgehäuse 111 ein Verteilerkanal 112 (Figur 4 und 5) ausgebildet ist, der an den Enden des Kunststoffgehäuses 111 in einem Anschlußmundstück 13 für den Kraftstoffzulauf und in einem Anschlußmundstück 14 für den Kraftstoffabfluß mündet. Das Anschlußmundstück 13 ist über eine Kraftstoffversorgungsleitung an einer Kraftstoffpumpe (nicht dargestellt) angeschlossen, die aus einem Kraftstofftank Kraftstoff fördert. Das Mundstück 14 ist über eine ebenfalls nicht dargestellte Rücklaufleitung mit dem Kraftstofftank verbunden. Zwischen dem Anschlußmundstück 14 und der Mündung des Verteilerkanals 112 in dem Anschlußmundstück 14 ist ein Druckregelventil 15 angeordnet, das den Kraftstoffdruck in dem Verteilerkanal 112 auf einen vorgegebenen Wert einregelt. Das Kunststoffgehäuse 111 trägt auf seiner Unterseite vier Anschlußstutzen 116, die über jeweils eine Mündungsöffnung 117 (Figur 4) mit dem Verteilerkanal 112 in Verbindung stehen. Die Anzahl der Anschlußstutzen 116 entspricht der Zahl der Verbrennungszylinder der Brennkraftmaschine.The fuel injection system for an internal combustion engine, which is only partially shown in FIG. 1, has a fuel distributor 110, in the plastic housing 111 of which a distributor channel 112 (FIGS. 4 and 5) is formed, which at the ends of the plastic housing 111 in a connecting mouthpiece 13 for the fuel supply and in one Connection mouthpiece 14 opens for the fuel drain. The connection mouthpiece 13 is connected via a fuel supply line to a fuel pump (not shown) which delivers fuel from a fuel tank. The mouthpiece 14 is connected to the fuel tank via a return line, also not shown. Between the connection mouthpiece 14 and the mouth of the distributor channel 112 in the connection mouthpiece 14, a pressure control valve 15 is arranged, which regulates the fuel pressure in the distributor channel 112 to a predetermined value. The plastic housing 111 carries on its underside four connecting pieces 116, each with one Mouth opening 117 (Figure 4) are connected to the distribution channel 112. The number of connecting pieces 116 corresponds to the number of combustion cylinders of the internal combustion engine.

Das Kraftstoffeinspritzsystem weist ferner - entsprechend der Anzahl der Verbrennungszylinder der Brennkraftmaschine - vier Kraftstoffeinspritzventile 118 der sog. top-feed-Bauart auf. Jedes dieser elektromagnetisch betätigbaren Kraftstoffeinspritzventile 118 hat ein Ventilgehäuse 119 mit einem an einem Ende ausgebildeten Zulaufstutzen 120 (Figur 4 und 5), der eine an seinem freien Stirnende mündende Kraftstoffzulauföffnung aufweist. Mit diesem Zulaufstutzen 120 ist jedes Kraftstoffeinspritzventil 118 in einem Anschlußstutzen 116 an der Unterseite des Kraftstoffverteilers 110 flüssigkeitsdicht eingesetzt, wobei die Kraftstoffzulauföffnung im Zulaufstutzen 120 über die Mündungsöffnung 117 im Anschlußstutzen 116 mit dem Verteilerkanal 112 in Verbindung steht. Zur Ventilbetätigung weisen die Kraftstoffeinspritzventile 118 jeweils einen hier nicht zu sehenden Elektromagneten auf, dessen Stromversorgung über zwei elektrische Steckelemente 121, 122 (Figur 4 und 5) erfolgt, die am Ventilgehäuse 119 nahe des Zulaufstutzens 120 seitlich vorstehen. Die Steckelemente 121, 122 weisen einen rechteckförmigen Querschnitt auf.The fuel injection system also has - corresponding to the number of combustion cylinders of the internal combustion engine - four fuel injection valves 118 of the so-called top-feed type. Each of these electromagnetically actuated fuel injection valves 118 has a valve housing 119 with an inlet connection 120 (FIGS. 4 and 5) formed at one end, which has a fuel inlet opening opening at its free end. With this inlet connection 120, each fuel injection valve 118 is inserted in a connection stub 116 on the underside of the fuel distributor 110 in a liquid-tight manner, the fuel inlet opening in the inlet connection 120 being connected to the distribution channel 112 via the opening 117 in the connection stub 116. For valve actuation, the fuel injection valves 118 each have an electromagnet (not shown here), the power supply of which is provided via two electrical plug-in elements 121, 122 (FIGS. 4 and 5) which project laterally on the valve housing 119 near the inlet connector 120. The plug elements 121, 122 have a rectangular cross section.

Im Kunststoffgehäuse 111 des Kraftstoffverteilers 110 ist eine Anzahl von elektrischen Steckerbuchsen 126, 127 (Figur 4 und 5) integriert, die zur korrespondierenden Aufnahme der Steckelemente 121, 122 ausgebildet sind. Jeweils zwei Steckerbuchsen 126, 127 sind räumlich einem Anschlußstutzen 116 so zugeordnet, daß beim Einschieben des Zulaufstutzens 120 eines Kraftstoffeinspritzventils 118 in den Anschlußstutzen 116 die Steckelemente 121, 122 zugleich in die zugeordneten Steckerbuchsen 126, 127 eindringen.A number of electrical plug sockets 126, 127 (FIGS. 4 and 5) are integrated in the plastic housing 111 of the fuel distributor 110 and are designed to accommodate the plug elements 121, 122 in a corresponding manner. Each two sockets 126, 127 are spatially assigned to a connecting piece 116 so that when inserting the inlet piece 120 of a fuel injector 118 into the connecting piece 116, the plug elements 121, 122 simultaneously penetrate into the associated sockets 126, 127.

Alle Steckerbuchsen 126, 127 sind einzeln über im Kunststoffgehäuse 111 des Kraftstoffverteilers 110 verlaufende elektrische Verbindungskabel mit einem mehrpoligen Anschlußstecker 30 verbunden, der an der einen Stirnseite des Kunststoffgehäuses 111 befestigt ist.All sockets 126, 127 are individually connected to a multi-pin connector 30, which is attached to one end face of the plastic housing 111, via electrical connecting cables running in the plastic housing 111 of the fuel distributor 110.

An den Anschlußstecker 30 wird das elektronische Steuergerät zur Steuerung der Kraftstoffeinspritzventile 118 über ein mehrradriges Kabel angeschlossen. Es gibt zwei Möglichkeiten der Ansteuerung der Kraftstoffeinspritzventile 118. Im ersten Fall wird jedes Kraftstoffeinspritzventil 118 individuell von der Steuerelektronik angesteuert, so daß über den Anschlußstecker 30 eine entsprechende Anzahl von elektrischen Steuerleitungen zwischen dem Steuergerät und den vier Kraftstoffeinspritzventilen 118 geführt sind. Im zweiten Fall werden alle Kraftstoffeinspritzventile 118 gleichzeitig angesteuert. Damit werden nur zwei elektrische Steuerleitungen benötigt.The electronic control unit for controlling the fuel injection valves 118 is connected to the connector 30 via a multi-wheel cable. There are two ways of controlling the fuel injection valves 118. In the first case, each fuel injection valve 118 is individually controlled by the control electronics, so that a corresponding number of electrical control lines are routed between the control device and the four fuel injection valves 118 via the connector 30. In the second case, all fuel injection valves 118 are activated simultaneously. This means that only two electrical control lines are required.

Der Kraftstoffverteiler 110 mit den darin eingesetzten Kraftstoffeinspritzventilen 118 kann als komplett vorgefertigt und endgeprüfte Baueinheit an der Brennkraftmaschine montiert werden, wobei die Einspritzmündungen 32 der Kraftstoffeinspritzventile 118 in jeweils ein Ansaugrohr der Brennkraftmaschine hineinragen.The fuel distributor 110 with the fuel injection valves 118 inserted therein can be assembled on the internal combustion engine as a completely prefabricated and final-checked structural unit, the injection orifices 32 of the fuel injection valves 118 each protruding into an intake pipe of the internal combustion engine.

In Figur 2 bis 4 ist ein Ausführungsbeispiel eines Kraftstoffverteilers 110 dargestellt. Im Kunststoffgehäuse 111 ist der Verteilerkanal 112 ausgebildet, der über Mündungsöffnungen 117 mit mehreren Anschlußstutzen 116 in Verbindung steht. Die rotationssymmetrischen Anschlußstutzen 116 sind einstückig an das langgestreckte kastenförmige Kunststoffgehäuse 111 angeformt und stehen an dessen Unterseite vor (Figur 2 und 3). Am Kunststoffgehäuse 111 angeformte Ohren 134 mit Befestigungslöchern 135 dienen zur Befestigung des komplett vormontierten Kraftstoffverteilers 110 an der Brennkraftmaschine.An exemplary embodiment of a fuel distributor 110 is shown in FIGS. 2 to 4. The distribution channel 112 is formed in the plastic housing 111 and communicates with a plurality of connecting pieces 116 via outlet openings 117. The rotationally symmetrical connecting pieces 116 are integrally formed on the elongated box-shaped plastic housing 111 and protrude on the underside thereof (FIGS. 2 and 3). Ears 134 formed on the plastic housing 111 with fastening holes 135 serve to fasten the completely pre-assembled fuel distributor 110 to the internal combustion engine.

In jedem Anschlußstutzen 116 sind nahe der Einstecköffnung 136 für die Zulaufstutzen 120 der Kraftstoffeinspritzventile 118 zwei zueinander diametral angeordnete Taschen 137,138 vorgesehen, die den Anschlußstutzen 116 und das Kunststoffgehäuse 111 durchziehen und zu der von den Anschlußstutzen 116 abgekehrten Oberseite des Kunststoffgehäuses 111 hin offen sind. Auf der der Einstecköffnung 136 für die Zulaufstutzen 120 zugekehrten Unterseite sind die Taschen 137,138 mit jeweils einem Schlitz 139,140 versehen, der so ausgebildet ist, daß ein elektrisches Steckelement 121 bzw. 122 am Kraftstoffeinspritzventil 118 hindurchtreten kann. In jeder Tasche 137 bzw. 138 ist eine Steckerbuchse 126,127 koaxial zu dem Schlitz 139 bzw. 140 eingeschoben und im unteren Teil der Tasche durch eine Verrastung gegen Axialverschiebung gesichert. Hierzu weist die Steckerbuchse 126 zw. 127 an ihrer einen Rückseite eine Federzunge 141 bzw. 142 auf, die hinter einer Rastnase 143 bzw. 144 in der Tasche 137,138 greift. Das von dem Schlitz 139 bzw. 140 abgekehrte Ende der Steckerbuchse 126 bzw. 127 ist mit einer Verbindungsleitung 145 bzw. 146 verbunden, die zu einem seitlich an dem Kunststoffgehäuse 111 vorgesehenen Anschlußstecker führt. Auf der Oberseite sind die Taschen 137 bzw. 138 durch eine Deckelschiene 147 abgedeckt, die mittels an der Oberseite der Taschen am Kunststoffgehäuse 111 vorgesehenen Rastungen 148 in dem Kunststoffgehäuse 111 eingeklipst ist. Jede Rastung 148 besteht aus zwei einander gegenüberliegenden Rastrippen 149,150 die von in die Taschen 137,138 hineinragenden seitlichen Stegen 168,169 der Deckelschiene 147 vorspringen und in üblicher Weise jeweils eine Einsteckschräge 151 und einen Rastvorsprung 152 aufweisen. Mit diesem Rastvorsprung 152 greifen die Rastrippen 149,150 hinter entsprehenden Vorsprüngen 153 an der gegenüberliegenden Taschenwand. Für Spritzwasserschutz ist in jedem längs verlaufenden Steg 168,169 der Deckelschiene 147 eine Nut 154 vorgesehen, in welcher jeweils eine Dichtung 155 einliegt.In each connector 116 near the insertion opening 136 for the inlet 120 of the fuel injection valves 118 two diametrically arranged pockets 137, 138 are provided, which run through the connector 116 and the plastic housing 111 and are open towards the top of the plastic housing 111 facing away from the connector 116. On the underside facing the insertion opening 136 for the inlet connection 120, the pockets 137, 138 are each provided with a slot 139, 140 which is designed such that an electrical plug element 121 or 122 on the fuel injection valve 118 can pass through. A plug socket 126, 127 is inserted coaxially to the slot 139 or 140 in each pocket 137 or 138 and secured against axial displacement in the lower part of the pocket by a catch. For this purpose, the connector socket 126 or 127 has on one rear side a spring tongue 141 or 142 which engages behind a latching lug 143 or 144 in the pocket 137, 138. The end of the plug socket 126 or 127 facing away from the slot 139 or 140 is connected to a connecting line 145 or 146 which leads to a connector provided on the side of the plastic housing 111. On the top, the pockets 137 and 138 are covered by a cover rail 147, which is clipped into the plastic housing 111 by means of catches 148 provided on the top of the pockets on the plastic housing 111. Each catch 148 consists of two mutually opposite catch ribs 149, 150 which project from lateral webs 168, 169 of the cover rail 147 projecting into the pockets 137, 138 and each have an insertion bevel 151 and a catch projection 152 in the usual manner. With this latching projection 152, the latching ribs 149, 150 engage behind corresponding projections 153 on the opposite pocket wall. For splash protection, a groove 154 is provided in each longitudinal web 168, 169 of the cover rail 147, in which each contains a seal 155.

Jeder Anschlußstutzen 116 trägt an seinem die Einstecköffnung 136 für die Zulaufstutzen 120 der Kraftstoffeinspritzventile 118 aufweisenden Ende einen axial vorspringenden Rastbund 156 zur mechanischen Verriegelung des in die Einstecköffnung 136 eingesetzten Kraftstoffeinspritzventils 118.Each connecting piece 116 has at its end having the insertion opening 136 for the inlet connection 120 of the fuel injection valves 118 an axially projecting locking collar 156 for mechanically locking the fuel injection valve 118 inserted into the insertion opening 136.

Jedes elektromagnetische Kraftstoffeinspritzventil 118 der sog. top-feed-Bauart hat wie üblich ein Ventilgehäuse 119 mit einem endseitig ausgebildeten Zulaufstutzen 120, der eine an seinem freien Stirnende mündende Kraftstoffzulauföffnung 157 aufweist. Auf das Stirnende des Ventilgehäuses 119 ist eine den Zulaufstutzen 120 mit einem nabenartigen Vorsprung 161 koaxial umschließende Kunststoffhaube 158 fest aufgesetzt, die einen radial überstehenden Verriegelungsflansch 159 trägt. Aus der dem Zulaufstutzen 120 zugekehrten Ringfläche 160 des Verriegelungsflansches 159 treten die beiden Steckelemente 121,122 frei aus und erstrecken sich diametral zueinander parallel zum und im Abstand vom Zulaufstutzen 120. Jedes Steckelement 121,122 ist wie üblich mit einem Wicklungsende einer Erregerwicklung eines Elektromagneten zur Ventilbetätigung elektrisch leitend verbunden. Bei der Montage wird das Kraftstoffeinspritzventil 118 mit seinem Zulaufstutzen 120 und dem diesen umgebenden nabenartigen Vorsprung 161 der Kunststoffhaube 158 in die Einstecköffnung 136 im Anschlußstutzen 116 eingeschoben, wobei die beiden Steckelemente 121,122 durch die Schlitze 139,140 in der die Einstecköffnung 136 umschließenden Ringfläche 162 am Anschlußstutzen 116 hindurchtreten und sich in die zugeordneten Steckerbuchsen 126,127 einschieben. Am Ende der Einschiebebewegung rastet der Rastbund 156 hinter den Verriegelungsflansch 159 und sichert das durch die Steckelemente 121,122 und Steckerbuchsen 126,127 drehfest im Anschlußstutzen 116 gehaltene Kraftstoffeinspritzventil 118 gegen ungewollte axiale Verschiebung. Zum Spritzwasserschutz ist zwischen der Ringläche 160 am Verriegelungsflansch 159 und der Ringfläche 162 am Anschlußstutzen 116 eine ringförmige Flachdichtung 163 eingelegt. Eine auf der Stirnseite des nabenartigen Vorsprungs 161 der Kunststoffhaube 158 aufliegende, den Zulaufstutzen 120 umschließende O-Ring-Dichtung 164 verhindert Kraftstoffaustritt aus dem Anschlußstutzen 116. Zum Schutze der Kraftstoffeinspritzventile 118 vor Schmutzpartikeln im Kraftstoff ist in jedem Zulaufstutzen 120 ein Filterkorb 165 eingesetzt.As is customary, each electromagnetic fuel injection valve 118 of the so-called top-feed type has a valve housing 119 with an inlet connection 120 formed at the end, which has a fuel inlet opening 157 opening at its free end. A plastic hood 158, which coaxially surrounds the inlet connection 120 with a hub-like projection 161 and carries a radially protruding locking flange 159, is firmly attached to the front end of the valve housing 119. The two plug-in elements 121, 122 emerge freely from the annular surface 160 of the locking flange 159 facing the inlet connection 120 and extend diametrically to one another parallel to and at a distance from the inlet connection 120. As usual, each plug-in element 121, 122 is electrically conductively connected to a winding end of an excitation winding of an electromagnet for valve actuation . During assembly, the fuel injection valve 118 with its inlet connection 120 and the hub-like projection 161 of the plastic hood 158 surrounding it is pushed into the insertion opening 136 in the connection nozzle 116, the two plug elements 121, 122 through the slots 139, 140 in the annular surface 162 surrounding the insertion opening 136 on the connection nozzle 116 step through and insert into the assigned sockets 126, 127. At the end of the insertion movement, the locking collar 156 snaps behind the locking flange 159 and secures this through Plug-in elements 121, 122 and sockets 126, 127 rotatably held in the connecting piece 116 fuel injector 118 against unwanted axial displacement. For splash water protection, an annular flat seal 163 is inserted between the annular surface 160 on the locking flange 159 and the annular surface 162 on the connecting piece 116. An O-ring seal 164, which lies on the end face of the hub-like projection 161 of the plastic hood 158 and surrounds the inlet connector 120, prevents fuel from escaping from the connector 116. To protect the fuel injection valves 118 from dirt particles in the fuel, a filter basket 165 is inserted in each inlet connector 120.

Der in Fig. 5 im Querschnitt dargestellte modifizierte Kraftstoffverteiler 110 unterscheidet sich von dem in Fig. 4 dargestellten und vorstehend beschriebenen Kraftstoffverteiler 110 nur dadurch, daß zu dem Verteilerkanal 112 hin ein Filterkanal 166 angeordnet ist, in dem ein Filter 167 auswechselbar einliegt. Damit entfällt das Einsetzen von Filterkörben 165 in jeden einzelnen Zulaufstutzen 120 der Kraftstoffeinspritzventile 118. Im übrigen stimmen alle Bauteile des Kraftstoffverteilers 110 in Fig. 5 mit den Bauteilen des Kraftstoffverteilers 110 gemäß Fig. 4 überein.The modified fuel distributor 110 shown in cross section in FIG. 5 differs from the fuel distributor 110 shown in FIG. 4 and described above only in that a filter duct 166 is arranged toward the distributor duct 112, in which a filter 167 is interchangeably inserted. This eliminates the need to insert filter baskets 165 into each individual inlet connection 120 of the fuel injection valves 118. Otherwise, all of the components of the fuel distributor 110 in FIG. 5 match the components of the fuel distributor 110 according to FIG. 4.

Claims (8)

  1. Fuel injection system for internal combustion engines, with a plurality of electromagnetically actuable fuel injection valves (118) of the top-feed type, which have a valve housing (119) with an inlet stub (120) having a fuel inlet opening (157) at the end and two electrical plug-in elements (121, 122) for controlling the valve which project from the valve housing (119), and with a fuel distributor (110) which has a distributor duct (112), formed in a plastic housing (111) and ending in a fuel inlet (13) and outlet (14), and a number, corresponding to the number of fuel injection valves (118), of connecting branches (116) which are integral with the plastic housing (111), are connected to the distributor duct (112) via outlet openings (117) and in which the fuel injection valves (118) are inserted fluid tightly by their inlet stubs (120), characterized in that integrated into the plastic housing (111) are electrical sockets (126, 127) which are designed to accept the plug-in elements (121, 122), and in that two of the sockets (126, 127) in each case are associated in such a way with a connecting branch (116) in the plastic housing (111) that, when the inlet stub (120) is pushed into the connecting branch (116), the plug-in elements (121, 122) simultaneously penetrate into the associated sockets (126, 127) and the two plug-in elements (121, 122) of each fuel injection valve (118) project axially from the valve housing (119) and extend parallel to and at a distance from the inlet stub (120), and in that accommodated in each of two pockets (137, 138) arranged in the connecting branch (116) near to an insertion opening (136) for the inlet stubs (120) of the fuel injection valves (118) is a respective socket (126, 126) which is connected to a connecting line (145, 146).
  2. System according to Claim 1, characterized in that, on their underside, which faces the insertion opening (136) for the inlet stubs (120), the pockets (137, 138) each have a slot (139, 140) for the passage of a plug-in element (121, 122) and pass through the plastic housing (111) transversely to the longitudinal axis of the fuel distributor (110), are open towards the upper side, facing away from the connecting branches (116) of the housing, and are sealed off by a longitudinally continuous cover rail (147) clipped onto the plastic housing (111).
  3. System according to Claim 2, characterized in that, to lock the sockets (126, 127) against axial displacement, the sockets (126, 127) have spring tongues (141, 142) which, after the sockets (126, 127) have been inserted, engage behind latching noses (143, 144) provided in the pockets (137, 138).
  4. System according to Claim 2 or 3, characterized in that a seal (155) rests between the side walls of the plastic housing (111) and latching webs (168, 169) of the cover rail (147) which enter the plastic housing (111).
  5. System according to one of Claims 1 to 4, characterized in that on its end having the insertion opening (136) for the inlet stubs (120) of the fuel injection valves (118), each connecting branch (116) bears an axially projecting latching collar (156) which is capable of latching behind a locking flange (159) on the inlet stub (120) of the fuel injection valves (118).
  6. System according to Claim 5, characterized in that a flat annular gasket (163) rests between the frontal annular surface (160) of the locking flange (159) and the annular surface (162) of the connecting branch (116), which annular surface has the slots (139, 140) and concentrically surrounds the insertion opening (136) for the inlet stubs (120).
  7. System according to one of Claims 1 to 6, characterized in that a dirt filter cage (165) is inserted in each inlet stub (120) of the fuel injection valves (118).
  8. System according to one of Claims 1 to 7, characterized in that extending between the distributor duct (112) and the outlet openings (117) of the connecting branches (116) is a longitudinally continuous filter passage (166) connected to both, and in that a filter (167) is arranged replaceably in the filter passage (166).
EP91901681A 1990-01-27 1991-01-10 Fuel-injection system for internal-combustion engines Expired - Lifetime EP0465613B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002393 1990-01-27
DE4002393A DE4002393A1 (en) 1990-01-27 1990-01-27 FUEL INJECTION SYSTEM FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0465613A1 EP0465613A1 (en) 1992-01-15
EP0465613B1 true EP0465613B1 (en) 1994-03-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901681A Expired - Lifetime EP0465613B1 (en) 1990-01-27 1991-01-10 Fuel-injection system for internal-combustion engines

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US (1) US5203304A (en)
EP (1) EP0465613B1 (en)
JP (1) JP3150692B2 (en)
KR (1) KR100195819B1 (en)
BR (1) BR9105240A (en)
DE (2) DE4002393A1 (en)
ES (1) ES2051585T3 (en)
WO (1) WO1991011608A1 (en)

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Also Published As

Publication number Publication date
JPH04505202A (en) 1992-09-10
DE4002393A1 (en) 1991-08-01
DE59101223D1 (en) 1994-04-28
ES2051585T3 (en) 1994-06-16
US5203304A (en) 1993-04-20
BR9105240A (en) 1992-08-04
KR920701661A (en) 1992-08-12
WO1991011608A1 (en) 1991-08-08
EP0465613A1 (en) 1992-01-15
KR100195819B1 (en) 1999-06-15
JP3150692B2 (en) 2001-03-26

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