EP0462116B1 - Storage fuel injection device - Google Patents

Storage fuel injection device Download PDF

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Publication number
EP0462116B1
EP0462116B1 EP90902999A EP90902999A EP0462116B1 EP 0462116 B1 EP0462116 B1 EP 0462116B1 EP 90902999 A EP90902999 A EP 90902999A EP 90902999 A EP90902999 A EP 90902999A EP 0462116 B1 EP0462116 B1 EP 0462116B1
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Prior art keywords
reservoir
injection
fuel injection
injection device
pressure
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EP90902999A
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German (de)
French (fr)
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EP0462116A1 (en
Inventor
Helmut Rembold
Ernst Linder
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0008—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using mechanically actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • the invention relates to a storage fuel injection device according to the preamble of claim 1.
  • storage fuel injection devices fuel is introduced under pressure from a continuously delivering charge pump into a pressure accumulator, a check valve being provided between the charge pump and the pressure accumulator in order to prevent fuel from being pressed back into the pump under pressure during the intake stroke of the pump.
  • Storage fuel injection devices subsequently require control devices which monitor the quantity and the time of the forwarding of the fuel under pressure to the injection nozzle, for which purpose, for example, rotating distributor shafts and / or valve arrangements, in particular solenoid valves, are used.
  • injection can take place directly into the combustion chamber of the engine, both during the suction stroke and in the compression stroke of a gasoline engine.
  • it has become known to subdivide the injection quantity into partial quantities, in particular a pre-injection quantity and a main injection quantity.
  • Such superimpositions of injection processes can subsequently lead to difficulties in the exact metering of the injection quantities and it is not readily possible to ensure defined injection quantities for different injection processes.
  • JP-A-57/212362 discloses a storage fuel injection device according to the preamble of claim 1.
  • the two memories one for storing the fuel injection quantity for the pre-injection and the other for storing the fuel injection quantity for a main injection serves, connected in parallel to each other with the pump workspace of the high pressure pump, each via an intermediate check valve.
  • This device has the disadvantage that the amount of fuel delivered by the high-pressure pump, which is designed as a piston pump, per pump piston stroke is divided between the two stores when filling the store, it being not certain which amount of fuel delivered by the high-pressure pump gets into which store.
  • the filling of the individual accumulators depends on various parameters, such as the flow resistance, the opening pressure of the check valves and the accumulator spring. This then results in a relatively large error in the pre-injection metered quantity, especially when the pre-injection quantity is usually kept very small.
  • the configuration according to the invention according to claim 1 of the storage fuel injection device has the advantage that a defined amount of fuel can be stored in advance by the stroke limitation of the movable wall of the first storage device, which amount can be used particularly advantageously for a pre-injection.
  • the accumulator piston is always in a defined starting position before the metering of the respective fuel injection quantity is controlled from this accumulator.
  • the stroke limitation ensures that the subsequent accumulator is filled securely and its movable wall is moved to a position defined by opening the overflow opening. There is thus a defined initial position of the movable wall at the time of metering, which increases the injection and fuel metering accuracy.
  • the design of the storage fuel injection device according to the invention also has the advantage that superimposition of injection processes, in particular when the injection process is divided into a pre-injection and a main injection process, and that it can be ensured at the same time that not only that for the pre-injection and the main injection predefined quantity but also a predefined pressure can be maintained.
  • a particularly simple construction can be realized in that the separate accumulators are arranged coaxially and have a compression spring common to both accumulator pistons. Even with such a design, it is readily possible to provide different pressure levels for pre-injection and main injection, for which the design can be made in a simple manner so that the pistons of the accumulators have different cross-sectional areas.
  • FIG. 1 shows a schematic illustration of a first embodiment of a storage fuel injection device according to the invention
  • FIG. 2 shows a modified embodiment of a storage device for use in a storage fuel injection device according to the invention.
  • a charge pump 1 delivers fuel from a tank 2 via check valves 3, 4 through a common fuel pressure line 5 into two pressure accumulators 6 and 7, the pistons 8, 9 of the accumulator being acted upon by springs 10 and 11, respectively.
  • the reservoir 6 used for a pre-injection has a stop 12 which limits the reservoir volume of the first reservoir 6.
  • the reservoir 7 used for a main injection has an overflow opening 13, so that when the maximum filling volume or the maximum filling pressure of the reservoir 7 is exceeded, the overflow opening 13 is released and fuel can flow under pressure into the tank or return, again indicated schematically by 2 .
  • the two pressure accumulators 6 and 7 are connected via pressure lines 14 and 15 as well as solenoid valves 16 and 17 arranged in these lines and a distributor shaft 18 connected into the pressure lines downstream of the solenoid valves 16, 17 in accordance with the rotational position of the distributor shaft 18 with injection nozzles (not shown in more detail) 1 shows a feed line to such an injection nozzle is designated 19.
  • a pre-injection can be carried out in a nozzle via the line 19 in the rotational position of the distributor shaft 18 shown via the line 19.
  • a main injection can also be carried out in the same injection nozzle with the corresponding switching of the solenoid valve 17 in the pressure line 15.
  • a pre-injection and a main injection can also be carried out in two different cylinders at the same time without the individual injection processes influencing one another. Since the pre-injection quantity is generally about 10 to 20% of the main injection quantity, the embodiment shown in FIG. 1 ensures that the piston 8 of the pressure accumulator 6 is always at the defined stop. The mutual influence of the two pressure accumulators 6 and 7 is prevented by the check valve 4. By appropriate dimensioning of the piston cross sections and the compression springs 10 and 11, different pressure levels can also be maintained in the two pressure accumulators.
  • the charge pump 1 delivers a largely pulsation-free flow and that in each case a sufficient amount of fuel is fed into the accumulators 6 and 7, so that emptying of the accumulators 6 and 7 is prevented in any case even at the highest speeds.
  • a control device (not shown in more detail) can be provided for load-dependent delivery of the charge pump.
  • the charge pump 1 delivers via check valves 3 and 4 into a reservoir 21 in which two reservoir pistons 22 and 23 are acted upon by a common compression spring 24.
  • Both storage pistons for the two separate pressure accumulators for the pre-injection and main injection are thus arranged coaxially to one another in a common housing, the storage piston 22 delimiting the storage space for the pre-injection and being connected to the pressure line 14, while the storage piston 23 is connected to the storage space limited for the main injection and is connected to the pressure line 15.
  • the storage piston 22 can in turn be moved against a stop 25, while the storage piston 23 interacts with an overflow opening 26 which, when the maximum storage volume is exceeded, releases an outflow cross section into the tank 2.
  • solenoid valves 16 and 17 and / or a distributor shaft 18 to the pressure lines 19 to the injection nozzles are arranged.
  • the different cross-sectional dimensions of the storage pistons 22 and 23 ensure that the pre-injection piston is in contact with the stop 25 when pressure fuel is applied, if no injection is carried out. Any possible influencing of the injection processes via the coupling of the accumulator pistons 22 and 23 via the common compression spring 24 can be neglected with a corresponding spring dimensioning with a small spring constant.

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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

In a storage fuel injection device, fuel may be taken under pressure by a compression pump (1) to two separate pressure stores (6 and 7) which are connected to injection nozzles via lines (14, 15, 19) and separate valve arrangements (16, 17). The separate stores (6, 7) make it possible to prevent preinjection and main injection processes from overlapping in different cylinders.

Description

Die Erfindung bezieht geht von einer Speicherkraftstoffeinspritzvorrichtung gemäß dem Oberbegriff des Patentanspruches 1 aus.The invention relates to a storage fuel injection device according to the preamble of claim 1.

Bei derartigen Speicherkraftstoffeinspritzvorrichtungen wird von einer kontinuierlich fördernden Ladepumpe Kraftstoff unter Druck in einen Druckspeicher eingebracht, wobei zwischen Ladepumpe und Druckspeicher ein Rückschlagventil vorgesehen ist, um zu verhindern, daß beim Ansaughub der Pumpe Kraftstoff unter Druck in die Pumpe zurück gepreßt wird. Speicherkraftstoffeinspritzvorrichtungen benötigen in der Folge Steuereinrichtungen, welche die Menge und den Zeitpunkt der Weiterleitung des Kraftstoffes unter Druck zur Einspritzdüse überwachen, wobei hiefür beispielsweise rotierende Verteilerwellen und/oder Ventilanordnungen, insbesondere Magnetventile, Verwendung finden. Bei üblichen Speicherkraftstoffeinsprichtzvorrichtungen der eingangs genannten Art erfolgt keine gesonderte Regulung der Ladepumpe und es wird lediglich dafür gesorgt, daß die Ladepumpe eine hinreichende Menge an Treibstoff in den Speicher fördert, welche verhindert, daß der Speicher insbesondere bei hohen Drehzahlen vollstäntig entleert werden kann.In such storage fuel injection devices, fuel is introduced under pressure from a continuously delivering charge pump into a pressure accumulator, a check valve being provided between the charge pump and the pressure accumulator in order to prevent fuel from being pressed back into the pump under pressure during the intake stroke of the pump. Storage fuel injection devices subsequently require control devices which monitor the quantity and the time of the forwarding of the fuel under pressure to the injection nozzle, for which purpose, for example, rotating distributor shafts and / or valve arrangements, in particular solenoid valves, are used. In conventional storage fuel injection devices of the type mentioned at the outset, there is no separate regulation of the charge pump and it is only ensured that the charge pump delivers a sufficient amount of fuel into the accumulator, which prevents the accumulator from being completely emptied, especially at high speeds.

Bei Speicherkraftstoffeinspritzvorrichtungen kann sowohl während des Saughubs als auch im Kompressionshub eines Ottomotors direkt in den Brennraum des Motors gespritzt werden. Zur Verbesserung des Emissionsverhaltens ist es hiebei bekannt geworden, die Einspritzmenge in Teilmengen, insbesondere eine Voreinspritzmenge und eine Haupteinspritzmenge zu unterteilen. Insbesondere bei Mehrzylindermotoren kann es hiebei zu Überschneidungen in der Kraftstoffentnahme aus einem derartigen Speicher kommen, wobei es zu Überlagerungen von Voreinspritz- und Haupteinspritzvorgängen in unterschiedlichen Zylindern kommen kann. Derartige Überlagerungen von Einspritzvorgängen Können in der Folge zu Schwierigkeiten bei der exakten Zumessung der Einspritzmengen führen und es ist nicht ohne weiteres möglich, definierte Einspritzmengen für unterschiedliche Einspritzvorgänge sicherzustellen.With storage fuel injection devices, injection can take place directly into the combustion chamber of the engine, both during the suction stroke and in the compression stroke of a gasoline engine. To improve the emission behavior, it has become known to subdivide the injection quantity into partial quantities, in particular a pre-injection quantity and a main injection quantity. In particular in the case of multi-cylinder engines, there may be overlaps in the fuel extraction from such an accumulator, with overlaps of pre-injection and main injection processes in different cylinders. Such superimpositions of injection processes can subsequently lead to difficulties in the exact metering of the injection quantities and it is not readily possible to ensure defined injection quantities for different injection processes.

Durch die JP-A-57/212362 ist eine Speicherkraftstoffeinspritzvorrichtung bekannt gemäß der Gattung des Patentanspruchs 1. Bei der bekannten Vorrichtung werden jedoch die beiden Speicher, von denen einer der Speicherung der Kraftstoffeinspritzmenge für die Voreinspritzung und der andere der Speichereung der Kraftstoffeinspritzmenge für eine Haupteinspritzung dient, parallel zueinander mit dem Pumpenarbeitsraum der Hochdruckpumpe verbunden jeweils über ein zwischengeschaltetes Rückschlagventil. Diese Einrichtung hat den Nachteil, daß beim Füllen der Speicher die von der Hochdruckpumpe, die als Kolbenpumpe ausgeführt ist, pro Pumpenkolbenhub geförderte Kraftstoffmenge auf beide Speicher aufgeteilt wird, wobei nicht gesichert ist, welche der von der Hochdruckpumpe geförderte Kraftstoffmenge in welchen Speicher gelangt. Die Füllung der einzelnen Speicher ist von verschiedenen Parameter, wie dem Strömungswiderstand, dem Öffnungsdruck der Rückschlagventile und der Speicherfeder abhängig. Daraus resultiert dann speziell bei einer üblicherweise sehr klein gehaltenen Voreinspritzmenge ein relativ großer Fehler der Voreinspritzzumeßmenge.JP-A-57/212362 discloses a storage fuel injection device according to the preamble of claim 1. In the known device, however, the two memories, one for storing the fuel injection quantity for the pre-injection and the other for storing the fuel injection quantity for a main injection serves, connected in parallel to each other with the pump workspace of the high pressure pump, each via an intermediate check valve. This device has the disadvantage that the amount of fuel delivered by the high-pressure pump, which is designed as a piston pump, per pump piston stroke is divided between the two stores when filling the store, it being not certain which amount of fuel delivered by the high-pressure pump gets into which store. The filling of the individual accumulators depends on various parameters, such as the flow resistance, the opening pressure of the check valves and the accumulator spring. This then results in a relatively large error in the pre-injection metered quantity, especially when the pre-injection quantity is usually kept very small.

Die erfindungsgemäße Ausgestaltung gemäß Patentanspruch 1 der Speicherkraftstoffeinspritzvorrichtung hat dagegen den Vorteil, daß durch die Hubbegrenzung der beweglichen Wand des ersten Speichers eine definierte Kraftstoffmenge vorgelagert werden kann, die insbesondere vorteilhaft für eine Voreinspritzung dienen kann. Für eine solche Einspritzung befindet sich der Speicherkolben immer in einer definierten Ausgangsstellung, bevor die Zumessung der jeweiligen Kraftstoffeinspritzmenge aus diesem Speicher gesteuert wird. Durch die Hubbegrenzung ist sichergestellt, daß der nachfolgende Speicher sicher gefüllt und dessen bewegliche Wand bis zu einer durch Aufsteuerung der Überströmöffnung definierten Stellung bewegt wird. Es liegt somit zum Zeitpunkt der Zumessung eine definierte Ausgangsstellung der beweglichen Wand vor, was die Einspritz- und Kraftstoffzumeßgenauigkeit erhöht.The configuration according to the invention according to claim 1 of the storage fuel injection device, on the other hand, has the advantage that a defined amount of fuel can be stored in advance by the stroke limitation of the movable wall of the first storage device, which amount can be used particularly advantageously for a pre-injection. For such an injection, the accumulator piston is always in a defined starting position before the metering of the respective fuel injection quantity is controlled from this accumulator. By the stroke limitation ensures that the subsequent accumulator is filled securely and its movable wall is moved to a position defined by opening the overflow opening. There is thus a defined initial position of the movable wall at the time of metering, which increases the injection and fuel metering accuracy.

Die erfindungsgemäße Ausbildung der Speicherkraftstoffeinspritzvorrichtung bringt weiterhin den Vorteil mit sich, daß Überlagerungen von Einspritzvorgängen, insbesondere bei Unterteïlung des Einspritzvorganges in einen Voreinspritz- und einen Haupteinspritzvorgang vermieden werden können, und daß gleichzeitig sichergestellt werden kann, daß für die Voreinspritzung und die Haupteinspritzung nicht nur die vordefinerte Menge sondern auch ein vordefinierter Druck eingehalten werden kann.The design of the storage fuel injection device according to the invention also has the advantage that superimposition of injection processes, in particular when the injection process is divided into a pre-injection and a main injection process, and that it can be ensured at the same time that not only that for the pre-injection and the main injection predefined quantity but also a predefined pressure can be maintained.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Speicherkraftstoffeinspritzvorrichtung möglich.The measures listed in the subclaims enable advantageous developments and improvements of the storage fuel injection device specified in the main claim.

Eine konstruktiv besonders einfache Ausbildung läßt sich dadurch verwirklichen, daß die gesonderten Speicher koaxial angeordnet sind und eine für beide Speicherkolben gemeinsame Druckfeder aufweisen. Auch bei einer derartigen Ausbildung ist es ohne weiteres möglich, für Vor- und Haupteinspritzung unterschiedliche Druckniveaus zur Verfügung zu stellen, wofür die Ausbildung in einfacher Weise so getroffen werden kann, daß die Kolben der Speicher unterschiedliche Querschnittsfläche aufweisen.A particularly simple construction can be realized in that the separate accumulators are arranged coaxially and have a compression spring common to both accumulator pistons. Even with such a design, it is readily possible to provide different pressure levels for pre-injection and main injection, for which the design can be made in a simple manner so that the pistons of the accumulators have different cross-sectional areas.

Insbesondere im Zusammenhang mit Mehrzylindermotoren und entsprechend großer Anzahl von Schaltvorgängen der Ventile für eine Unterteilung der Einspritzung in Voreinspritzung und Haupteinspritzung ist es besonders vorteilhaft, die Ausbildung so zu treffen, daß in die Leitung zu den Einspritzdüsen zusätzlich zu Magnetventilen ein Verteilerventil, insbesondere eine rotierende Welle mit Steuerbohrungen bzw. -nuten eingeschaltet ist, wobei eine derartige Ausbildung im Zusammenhang mit konventionellen Speicherkraftstoffeinspritzvorrichtungen an sich bekannt ist.Particularly in connection with multi-cylinder engines and a correspondingly large number of switching operations of the valves for a subdivision of the injection into pre-injection and main injection, it is particularly advantageous to design such that a distributor valve, in particular a rotating shaft, in addition to solenoid valves in the line to the injection nozzles is switched on with control bores or grooves, such a design is known per se in connection with conventional storage fuel injection devices.

Die Erfindung wird nachfolgend an Hand von in der Zeichnung schematisch dargestellten Ausführungsbeispielen näher erläutert. In dieser zeigen Fig.1 eine schematische Darstellung einer ersten Ausführungsform einer erfindungsgemäßen Speicherkraftstoffeinspritzvorrichtung und Fig.2 eine abgewandelte Ausführungsform eines Speichers zur Verwendung in einer erfirdungsgemäßen Speicherkraftstoffeinspritzvorrichtung.The invention is explained in more detail below on the basis of exemplary embodiments schematically illustrated in the drawing. 1 shows a schematic illustration of a first embodiment of a storage fuel injection device according to the invention and FIG. 2 shows a modified embodiment of a storage device for use in a storage fuel injection device according to the invention.

Bei der Speicherkraftstoffeinspritzvorrichtung der Fig.1 fördert eine Ladepumpe 1 Kraftstoff aus einem Tank 2 über Rückschlagventile 3, 4 durch eine gemeinsame Kraftstoffdruckleitung 5 in zwei Druckspeicher 6 und 7, wobei die Kolben 8, 9 der Speicher jeweils von Federn 10 und 11 beaufschlagt sind. Der für eine Voreinspritzung herangezogene Speicher 6 weist dabei einen Anschlag 12 auf, welcher das Speichervolumen des ersten Speichers 6 begrenzt. Der für eine Haupteinspritzung herangezogene Speicher 7 weist eine Überströmöffnung 13 auf, so daß bei Überschreiten des maximalen Füllvolumens bzw. des maximalen Fülldruckes des Speichers 7 die Überströmöffnung 13 freigegeben wird und Kraftstoff unter Druck in den wiederum schematisch mit 2 angedeuteten Tank bzw. Rücklauf abströmen kann.In the storage fuel injection device of FIG. 1, a charge pump 1 delivers fuel from a tank 2 via check valves 3, 4 through a common fuel pressure line 5 into two pressure accumulators 6 and 7, the pistons 8, 9 of the accumulator being acted upon by springs 10 and 11, respectively. The reservoir 6 used for a pre-injection has a stop 12 which limits the reservoir volume of the first reservoir 6. The reservoir 7 used for a main injection has an overflow opening 13, so that when the maximum filling volume or the maximum filling pressure of the reservoir 7 is exceeded, the overflow opening 13 is released and fuel can flow under pressure into the tank or return, again indicated schematically by 2 .

Die beiden Druckspeicher 6 und 7 sind über Druckleitungen 14 und 15 sowie in diesen Leitungen angeordnete Magnetventile 16 und 17 und eine stromabwärts der Magnetventile 16, 17 in die Druckleitungen eingeschaltete Verteilerwelle 18 entsprechend der Drehlage der Verteilerwelle 18 mit nicht näher dargestellten Einspritzdüsen verbunden, wobei in Fig.1 eine Zuleitung zu einer derartigen Einspritzdüse mit 19 bezeichnet ist. In der in Fig.1 gezeigten Stellung der Magnetventile 16 bzw. 17 erfolgt keine Kraftstoffentnahme aus den Druckspeichern. Bei einer Umschaltung des Magnetventiles 16 kann in der gezeigten Drehstellung der Verteilerwelle 18 über die Leitung 19 eine Voreinspritzung in einer Düse über die Leitung 19 vorgenommen werden. In der Folge kann nach einer entsprechenden Drehbewegung der Verteilerwelle 18, welche mit der Nockenwelle im ailgemeinen gekoppelt ist, in derselben Einspritzdüse bei entsprechender Schaltung des Magnetventiles 17 in der Druckleitung 15 auch eine Haupteinspritzung vorgenommen werden.The two pressure accumulators 6 and 7 are connected via pressure lines 14 and 15 as well as solenoid valves 16 and 17 arranged in these lines and a distributor shaft 18 connected into the pressure lines downstream of the solenoid valves 16, 17 in accordance with the rotational position of the distributor shaft 18 with injection nozzles (not shown in more detail) 1 shows a feed line to such an injection nozzle is designated 19. In the position of the solenoid valves 16 and 17 shown in FIG. 1, there is no fuel removal from the pressure accumulators. When the solenoid valve 16 is switched over, a pre-injection can be carried out in a nozzle via the line 19 in the rotational position of the distributor shaft 18 shown via the line 19. Subsequently, after a corresponding rotational movement of the distributor shaft 18, which is generally coupled to the camshaft, a main injection can also be carried out in the same injection nozzle with the corresponding switching of the solenoid valve 17 in the pressure line 15.

Durch das Vorsehen von zwei getrennten Druckspeichern 6 und 7 für eine Voreinspritzung und eine Haupteinspritzung kann auch in zwei unterschiedlichen Zylindern gleichzeitig eine Voreinspritzung und eine Haupteinspritzung vorgenommen werden, ohne daß es dadurch zu einer gegenseitigen Beeinflussung der einzelnen Einspritzvorgänge kommt. Da die Voreinspritzmenge im allgemeinen etwa 10 bis 20 % von der Haupteinspritzmenge beträgt, ist durch die in Fig.1 dargestellte Ausführungsform sichergestellt, daß sich der Kolben 8 des Druckspeichers 6 immer am definierten Anschlag befindet. Die gegenseitige Beeinflussung der beiden Druckspeicher 6 und 7 wird dabei durch das Rückschlagventil 4 verhindert. Durch entsprechende Bemessung der Kolbenquerschnitte sowie der Druckfedern 10 und 11 können weiters in den beiden Druckspeichern unterschiedliche Druckniveaus aufrechterhalten werden.By providing two separate pressure accumulators 6 and 7 for a pre-injection and a main injection A pre-injection and a main injection can also be carried out in two different cylinders at the same time without the individual injection processes influencing one another. Since the pre-injection quantity is generally about 10 to 20% of the main injection quantity, the embodiment shown in FIG. 1 ensures that the piston 8 of the pressure accumulator 6 is always at the defined stop. The mutual influence of the two pressure accumulators 6 and 7 is prevented by the check valve 4. By appropriate dimensioning of the piston cross sections and the compression springs 10 and 11, different pressure levels can also be maintained in the two pressure accumulators.

Es wird dabei vorausgesetzt, daß die Ladepumpe 1 einen weitgehend pulsationsfreien Förderstrom liefert und daß jeweils eine hinreichende Menge an Kraftstoff in die Speicher 6 und 7 gefördert wird, so daß auch bei höchsten Drehzahlen ein Entleeren der Speicher 6 und 7 in jedem Fall verhindert wird. Neben der Überströmöffnung 13 zur Begrenzung des maximalen Speichervolumens kann eine nicht näher dargestellte Regeleinrichtung für eine lastabhängige Förderung der Ladepumpe vorgesehen sein.It is assumed that the charge pump 1 delivers a largely pulsation-free flow and that in each case a sufficient amount of fuel is fed into the accumulators 6 and 7, so that emptying of the accumulators 6 and 7 is prevented in any case even at the highest speeds. In addition to the overflow opening 13 for limiting the maximum storage volume, a control device (not shown in more detail) can be provided for load-dependent delivery of the charge pump.

In der in Fig.1 dargestellten Stellung der Magnetventile 16 und 17 findet eine Entlastung der Druckleitung 19 über Rückschlagventile 20 in den Rücklauf bzw. Tank 2 statt.In the position of the solenoid valves 16 and 17 shown in FIG. 1, the pressure line 19 is relieved via check valves 20 into the return line or tank 2.

Bei der in Fig.2 dargestellten Ausführungsform fördert die Ladepumpe 1 über Rückschlagventile 3 und 4 in einen Speicher 21, in welchem zwei Speicherkolben 22 und 23 von einer gemeinsamen Druckfeder 24 beaufschlagt sind. Es sind somit beide Speicherkolben für die zwei getrennten Druckspeicher für die Voreinspritzung und Haupteinspritzung in einem gemeinsamen Gehäuse koaxial zueinander angeordnet, wobei der Speicherkolben 22 den Speicherraum für die Voreinspritzung begrenzt und mit der Druckleitung 14 in Verbindung steht, während der Speicherkolben 23 den Speicherraum für die Haupteinspritzung begrenzt und mit der Druckleitung 15 in Verbindung steht. Der Speicherkolben 22 ist wiederum gegen einen Anschlag 25 bewegbar, während der Speicherkolben 23 mit einer Überströmöffnung 26 zusammenwirkt, welche bei Überschreiten des maximalen Speichervolumens einen Abströmquerschnitt in den Tank 2 freigibt. In den Leitungen 14 und 15 sind, wie bei der Ausführungsform gemäß Fig.1, wiederum Magnetventile 16 bzw. 17 und/oder eine Verteilerwelle 18 zu Druckleitungen 19 zu Einspritzdüsen angeordnet. Durch die unterschiedliche Querschnittsbemessung der Speicherkolben 22 und 23 wird sichergestellt, daß der Voreinspritzkolben jeweils bei Beaufschlagung mit Druckkraftstoff am Anschlag 25 anliegt, wenn keine Einspritzung durchgeführt wird. Eine eventuell mögliche Beeinflussung der Einspritzvorgänge über die Kopplung der Speicherkolben 22 und 23 über die gemeinsame Druckfeder 24 kann bei entsprechender Federdimensionierung mit kleiner Federkonstante vernachlässigt werden.In the embodiment shown in FIG. 2, the charge pump 1 delivers via check valves 3 and 4 into a reservoir 21 in which two reservoir pistons 22 and 23 are acted upon by a common compression spring 24. Both storage pistons for the two separate pressure accumulators for the pre-injection and main injection are thus arranged coaxially to one another in a common housing, the storage piston 22 delimiting the storage space for the pre-injection and being connected to the pressure line 14, while the storage piston 23 is connected to the storage space limited for the main injection and is connected to the pressure line 15. The storage piston 22 can in turn be moved against a stop 25, while the storage piston 23 interacts with an overflow opening 26 which, when the maximum storage volume is exceeded, releases an outflow cross section into the tank 2. In the lines 14 and 15, as in the embodiment according to FIG. 1, solenoid valves 16 and 17 and / or a distributor shaft 18 to the pressure lines 19 to the injection nozzles are arranged. The different cross-sectional dimensions of the storage pistons 22 and 23 ensure that the pre-injection piston is in contact with the stop 25 when pressure fuel is applied, if no injection is carried out. Any possible influencing of the injection processes via the coupling of the accumulator pistons 22 and 23 via the common compression spring 24 can be neglected with a corresponding spring dimensioning with a small spring constant.

Claims (4)

  1. Reservoir-type fuel injection device with a high pressure pump which can be connected to a first reservoir (6) and a second (7) reservoir, each provided with a wall (8, 9; 22, 23) which moves against a return force (10, 11; 24), it being possible to disconnect the first reservoir (6) and the second reservoir (7) from the high pressure pump (1) by means of a first non-return valve (3) and a second non-return valve (4), respectively, and the first reservoir being connected by a first controlled valve (16), directly connected to it, and the second reservoir being connected via a second controlled valve (17), directly connected to it, to a common injection nozzle, characterised in that the second reservoir (7; 21, 23) is connected downstream of the first reservoir (6; 21, 22) via the second non-return valve (4), in that one of the reservoirs (6; 21, 22) has a stroke limitation stop (12; 25) for its movable wall (8; 22) and in that the other reservoir (7; 21, 23) has a relief opening (13; 26) controlled by its movable wall (9; 23).
  2. Reservoir-type fuel injection device according to Claim 1, characterised in that the reservoirs (21) are coaxially located and have a common compression spring (24) for both reservoirs (22, 23).
  3. Reservoir-type fuel injection device according to one of Claims 1 to 2, characterised in that the movable walls (8, 9, 22, 23) of the reservoirs (6, 7, 21) have different cross-sectional areas.
  4. Reservoir-type fuel injection device according to one of Claims 1 to 3, characterised in that the controlled valves are solenoid valves (16, 17) whose outlets can be connected to the injection nozzles via a distributor valve (18), in particular one with a rotationally driven rotary spool.
EP90902999A 1989-03-10 1990-02-17 Storage fuel injection device Expired - Lifetime EP0462116B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3907766 1989-03-10
DE3907766A DE3907766A1 (en) 1989-03-10 1989-03-10 STORAGE FUEL INJECTION DEVICE

Publications (2)

Publication Number Publication Date
EP0462116A1 EP0462116A1 (en) 1991-12-27
EP0462116B1 true EP0462116B1 (en) 1992-09-02

Family

ID=6376004

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Application Number Title Priority Date Filing Date
EP90902999A Expired - Lifetime EP0462116B1 (en) 1989-03-10 1990-02-17 Storage fuel injection device

Country Status (5)

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US (1) US5146894A (en)
EP (1) EP0462116B1 (en)
JP (1) JPH04503986A (en)
DE (2) DE3907766A1 (en)
WO (1) WO1990010789A1 (en)

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GB9422864D0 (en) * 1994-11-12 1995-01-04 Lucas Ind Plc Fuel system
DE19640826B4 (en) * 1995-10-03 2004-11-25 Nippon Soken, Inc., Nishio Storage fuel injection device and pressure control device therefor
JPH11247742A (en) * 1998-03-02 1999-09-14 Zexel:Kk Plunger pump
DE69905685T2 (en) * 1998-11-19 2003-10-02 Mitsubishi Motors Corp Fuel injection device of the battery type
DE19910976B4 (en) * 1999-03-12 2004-08-05 Robert Bosch Gmbh Fuel injection system for an internal combustion engine, with a multi-stage high-pressure pump and two pressure accumulators
DE19910971A1 (en) * 1999-03-12 2000-09-21 Bosch Gmbh Robert Fuel injection system for an internal combustion engine, with a high pressure pump and two pressure accumulators
DE19939426A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Fuel injection system for an internal combustion engine
JP3987298B2 (en) * 2001-04-05 2007-10-03 三菱ふそうトラック・バス株式会社 Accumulated fuel injection system
ATE421040T1 (en) * 2002-07-01 2009-01-15 Mitsubishi Heavy Ind Ltd FUEL INJECTION VALVE AND DIESEL ENGINE WITH IT
US11035331B2 (en) * 2018-01-31 2021-06-15 Jonathan Tom Tavernier Internal combustion engine with tubular fuel injection

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DE1283597B (en) * 1965-03-17 1968-11-21 Daimler Benz Ag Device for controlling the pre-injection
DE1751128C3 (en) * 1968-04-08 1974-04-25 Teldix Gmbh, 6900 Heidelberg Fuel injection device for internal combustion engines
DE1801156A1 (en) * 1968-10-04 1970-04-16 Teldix Luftfahrt Ausruestung Fuel injection device with a double chamber divided by a movable wall
GB1403363A (en) * 1971-10-30 1975-08-28 Cav Ltd Fuel injection systems
US4167168A (en) * 1976-02-05 1979-09-11 Nippondenso Co., Ltd. Fuel injection apparatus
DE2834633A1 (en) * 1978-08-08 1980-03-06 Bosch Gmbh Robert PRE-INJECTION CONTROL DEVICE
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DE3245142A1 (en) * 1982-12-07 1984-06-07 Robert Bosch Gmbh, 7000 Stuttgart METHOD AND DEVICE FOR INJECTING FUEL
DE3425460A1 (en) * 1983-08-26 1985-03-07 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION DEVICE FOR DEFINED PRELIMINARY AND MAIN INJECTION IN INTERNAL COMBUSTION ENGINES
DE3330774A1 (en) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION DEVICE WITH PRIMARY AND MAIN INJECTION IN INTERNAL COMBUSTION ENGINES
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DE3844367A1 (en) * 1988-12-30 1990-07-05 Bosch Gmbh Robert FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES

Also Published As

Publication number Publication date
US5146894A (en) 1992-09-15
WO1990010789A1 (en) 1990-09-20
JPH04503986A (en) 1992-07-16
EP0462116A1 (en) 1991-12-27
DE3907766A1 (en) 1990-09-13
DE59000289D1 (en) 1992-10-08

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