EP1247978B1 - Fuel injection system for an internal combustion engine - Google Patents
Fuel injection system for an internal combustion engine Download PDFInfo
- Publication number
- EP1247978B1 EP1247978B1 EP02007620A EP02007620A EP1247978B1 EP 1247978 B1 EP1247978 B1 EP 1247978B1 EP 02007620 A EP02007620 A EP 02007620A EP 02007620 A EP02007620 A EP 02007620A EP 1247978 B1 EP1247978 B1 EP 1247978B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- piston
- fuel
- injection system
- fuel injection
- 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 - Fee Related
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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
- F02M63/0003—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
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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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
- F02M63/0003—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
- F02M63/0005—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 valves actuated by fluid pressure
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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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
- F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
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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
Definitions
- the invention relates to a fuel injection system for an internal combustion engine according to the preamble of claim 1.
- fuel injection systems which contain one, usually of several, fuel injectors supplied with fuel under high pressure via a high-pressure fuel line for injecting the fuel into the combustion chamber of the internal combustion engine during an injection process.
- a pressure control valve upstream of the fuel injector in the high-pressure fuel line can be provided for controlling the pressure of the fuel injected into the combustion chamber of the internal combustion engine during the injection process.
- the pressure control valve comprises a freely displaceable piston with a slide connected in the flow path of the high-pressure fuel line to enlarge and reduce the passage cross section of the flow path depending on the position of the piston.
- the position of the piston is determined by the pressures prevailing in a first and second pressure chamber.
- a control valve that controls an outflow channel and that can be designed with a piezo actuator serves to set the pressures in the first pressure chamber.
- Another fuel injection system for an internal combustion engine is known from DE 197 34 354 A1, which has a pressure control valve for time-dependent modulation of the fuel quantity injected during the injection process.
- an adjusting device for controlling this modulation valve is provided, which contains a piston which is acted upon by fuel on both sides. This controls a valve needle body of the modulation valve on the basis of a resulting difference in force between the pressure forces acting on both sides of the piston. It is double-acting on the front
- a first pressure chamber acted upon by fuel under high pressure in the opening direction of the modulation valve and a second pressure chamber acted upon by fuel in the closing direction are provided on the rear of the piston acting on both sides.
- the second pressure chamber is relieved of pressure during the displacement of the piston acting on both sides in the sense of opening the modulation valve via an outlet channel provided with a throttle point.
- a memory injection device of a similar type in which the fuel injector is used to implement a second pressure level a switching valve is provided under high pressure fuel supplying fuel high pressure line. When the switching valve is closed, the fuel injector is supplied with a residual pressure which is maintained via a pressure-maintaining valve provided in the high-pressure fuel line between the switching valve and the fuel injector.
- the object of the invention is to provide an improved fuel injection system in which there is the possibility of shaping the injection pressure curve.
- the invention provides a fuel injection system for an internal combustion engine, in particular a diesel engine.
- the fuel injection system contains a fuel injector, which is supplied with fuel held under high pressure via a high-pressure fuel line, for injecting the fuel into the combustion chamber of the internal combustion engine during an injection process.
- a pressure control valve is provided in the high-pressure fuel line upstream of the fuel injector for controlling the pressure of the fuel injected during the injection process.
- the pressure control valve contains a freely displaceable piston acting on both sides and a slide connected in the flow path of the high-pressure fuel line for opening and closing the passage cross section of the flow path of the high-pressure fuel line depending on the position of the piston.
- a first pressure chamber acting on the piston in the opening direction of the slide is formed on the front of the piston and a second pressure chamber acting on the piston in the closing direction of the slide is formed on the rear of the piston.
- a control valve is used to set the pressures in the first and / or second pressure chamber in the sense of a displacement of the piston in the opening or closing direction.
- the slide is formed in one piece with the piston, the first and second pressure chambers being provided at the ends of the piston and the slide being provided in a central region of the piston.
- the first pressure chamber provided on the front of the piston is connected to the upstream side of the high-pressure fuel line via a first flow connection
- the second pressure chamber provided on the rear of the piston is connected to the downstream side of the via a second flow connection High pressure fuel line in connection.
- the control valve is preferably provided for setting the pressure of the first pressure chamber.
- control valve is provided in a relief line connected to the first pressure chamber.
- control valve comprises a proportional actuation device.
- Such a proportional actuation device is particularly advantageously formed by a piezo actuator.
- An inlet throttle is preferably provided in the first flow connection connecting the first pressure chamber with the upstream side of the high-pressure fuel line. It is also advantageous if a damping throttle is provided in the second flow connection which is connected to the downstream side of the high-pressure fuel line.
- this is the second pressure space provided on the rear of the piston with the downstream side the second high-pressure line connecting the fuel flow connection is designed as a flow channel running in the piston.
- the second flow connection connecting the second pressure chamber provided on the rear side of the piston to the downstream side of the high-pressure fuel line can be designed as an external channel.
- the flow channel forming the second flow connection extends in the longitudinal direction of the piston from the second pressure chamber to the cross connection forming the flow path of the high-pressure fuel line.
- the figure shows a schematic block diagram of an embodiment of the fuel injection system according to the invention.
- the reference numeral 1 denotes a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, in particular a diesel engine, during an injection process. Fuel held at high pressure is supplied to the fuel injector 1 via a high-pressure fuel line 13.
- the high-pressure fuel line 13 is connected to a high-pressure accumulator, not specifically shown in the figure, which is in the manner of an oil-elastic high-pressure accumulator works and in which the fuel is conveyed from a fuel supply by means of a high-pressure pump (also not shown) (common rail system).
- the fuel injector 1 can be constructed in a conventional manner, comprising an injection nozzle 28, which is opened when a control chamber 41 provided in the fuel injector 1 is relieved. Fuel under high pressure is supplied to the control chamber 41 from the high-pressure fuel line 13 via a control pressure line 42, in which an inlet throttle 4 is provided. Also connected to the control chamber 41 is a relief line 44, into which a return throttle 10 is connected and which can be relieved of pressure by means of a control valve 5 to a leakage line 48, a control quantity R being generated.
- the control valve 5 can be controlled via an actuating device 8, for example by means of a piezo actuator.
- a pressure control valve 26 is provided upstream of the fuel injector 1 in the flow path of the high-pressure fuel line 13.
- This contains a freely displaceable piston 30 acting on both sides and, integrally formed with it, a slide 32 for opening and closing the passage cross-section of the flow path of the high-pressure line 13 depending on the position of the piston 30.
- a first pressure chamber 36 acting on the slide 32 is provided, and a second pressure chamber 38 acting on the piston 30 in the closing direction of the slide 32 is formed on the rear of the piston 30.
- the first pressure chamber 36 provided on the front of the piston 30 is connected to the upstream side of the high-pressure fuel line 13 via a first flow connection 20.
- the second pressure chamber provided on the rear of the piston 30 is connected to the second via a flow connection downstream side of the high-pressure fuel line 13, which supplies the fuel to the fuel injector 1.
- a control valve 14, 16 which is generally used to adjust the pressure conditions in the two pressure chambers 36, 38 in the sense of a displacement of the piston 30 in the opening or closing direction, is in the embodiment shown in the figure for adjusting the pressure of the first pressure chamber 36 in one the relief line 40 connected to the first pressure chamber 36 is provided.
- the first pressure chamber 36 can be relieved of pressure via the relief line 40 to a leakage line 46 by means of a valve body 14 of the control valve 14, 16, a control quantity R being generated.
- the control valve also contains a proportional actuation device 16, which allows a proportional opening and closing of the valve body 14 of the control valve 14, 16 over a predetermined adjustment range.
- the proportional actuation device 16 is formed in particular by a piezo actuator.
- an inlet throttle 18 is provided, via which the first pressure chamber 36 is filled by the high-pressure fuel line 13 with a predetermined amount of fuel per unit of time.
- the pressure in the first pressure chamber 36 which acts on the piston 30 in the opening direction of the slide 32, results from the ratio of the fuel quantity flowing through the first flow connection 20 to the first pressure chamber 36 and the fuel quantity flowing off via the relief line 40 and the control valve 14, 16.
- a damping throttle 27 is provided, which dampens or from the second pressure chamber 38 to the downstream side of the high-pressure fuel line 13 when the piston 30 is displaced outflowing fuel quantity causes.
- the second flow connection connecting the second pressure chamber 38 provided on the rear side of the piston 30 to the downstream side of the high-pressure fuel line 13 is provided as a flow channel 22 which is centrally located in the piston 30 the longitudinal direction of which is formed and leads from the second pressure chamber 38 to the cross connection forming the flow path of the high-pressure fuel line 13.
- this second flow connection is designed as an external channel 24 which leads outside the piston 30 from the second pressure chamber 38 to the downstream side of the high-pressure fuel line 13.
- the fuel present at the high-pressure fuel line 13 under high pressure is fed as working fluid to the first pressure chamber 36 via the inlet throttle 18 provided in the first flow connection 20.
- the valve body of the control valve 14, 16 (2/2 valve), which is controlled by the piezo actuator 16, any pressure can be set in the first pressure chamber 36.
- This pressure represents the reference variable for the proportional pressure control valve 26.
- the slide 32 connected in the flow path of the high-pressure fuel line 13 assumes a position which is defined from the pressure balance in the first and second pressure chambers 36, 38 on the piston 30 acting on both sides. This results in a displacement of the piston 30 and thus of the slide 32 formed in one piece with it until a pressure equilibrium is established between the first pressure chamber 36 and the second pressure chamber 38.
- the slide 32 opens the flow path of the high-pressure fuel line 13 and thus again ensures pressure compensation at a higher level.
- the pressure on the downstream side of the pressure control valve 36 which is decisive for the injection process, is thus also the controlled variable for the proportional valve 26 It is possible, by changing the control of the pressure control valve 26 via the piezo actuator 16, to display almost any injection curves.
Abstract
Description
Die Erfindung betrifft ein Kraftstoffeinspritzsystem für eine Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injection system for an internal combustion engine according to the preamble of claim 1.
Für Brennkraftmaschinen, insbesondere für Dieselmotoren, sind Kraftstoffeinspritzsysteme bekannt, die einen, üblicherweise von mehreren, über eine Kraftstoffhochdruckleitung mit unter hohem Druck vorgehaltenem Kraftstoff versorgten Kraftstoffinjektor zum Einspritzen des Kraftstoffs in den Brennraum der Brennkraftmaschine während eines Einspritzvorgangs enthalten. Zusätzlich kann bei einem solchen Kraftstoffeinspritzsystem ein in der Kraftstoffhochdruckleitung dem Kraftstoffinjektor vorgeschaltetes Drucksteuerventil zur Steuerung des Drucks des während des Einspritzvorgangs in den Brennraum der Brennkraftmaschine eingespritzten Kraftstoffs vorgesehen sein.For internal combustion engines, in particular for diesel engines, fuel injection systems are known which contain one, usually of several, fuel injectors supplied with fuel under high pressure via a high-pressure fuel line for injecting the fuel into the combustion chamber of the internal combustion engine during an injection process. In addition, in such a fuel injection system, a pressure control valve upstream of the fuel injector in the high-pressure fuel line can be provided for controlling the pressure of the fuel injected into the combustion chamber of the internal combustion engine during the injection process.
Aus der DE 199 21 878 A1 geht ein Kraftstoffeinspritzsystem dieser Art als bekannt hervor. Das Drucksteuerventil umfasst einen frei verschieblichen Kolben mit einem in den Strömungsweg der Kraftstoffhochdruckleitung geschalteten Schieber zum Vergrößern und Verkleinern des Durchgangsquerschnitts des Strömungswegs in Abhängigkeit von der Lage des Kolbens. Die Lage des Kolbens wird bestimmt durch in einem ersten und zweiten Druckraum herrschende Drücke. Zum Einstellen der Drücke in dem ersten Druckraum dient ein einen Abflusskanal steuerndes Stellventil, das mit einem Piezostellglied ausgebildet sein kann.DE 199 21 878 A1 discloses a fuel injection system of this type as known. The pressure control valve comprises a freely displaceable piston with a slide connected in the flow path of the high-pressure fuel line to enlarge and reduce the passage cross section of the flow path depending on the position of the piston. The position of the piston is determined by the pressures prevailing in a first and second pressure chamber. A control valve that controls an outflow channel and that can be designed with a piezo actuator serves to set the pressures in the first pressure chamber.
Aus der DE 197 34 354 A 1 ist ein weiteres Kraftstoffeinspritzsystem für eine Brennkraftmaschine bekannt, welches ein Drucksteuerventil zur zeitabhängigen Modulation der während des Einspritzvorgangs eingespritzten Kraftstoffmenge aufweist. Gemäß einem der dort beschriebenen Ausführungsbeispiele ist eine Verstelleinrichtung zur Steuerung dieses Modulationsventils vorgesehen, welche einen beidseitig von Kraftstoff beaufschlagten Kolben enthält. Dieser steuert einen Ventilnadelkörper des Modulationsventils aufgrund einer resultierenden Kraftdifferenz der an beiden Seiten des Kolbens wirkenden Druckkräfte. Dabei ist auf der Vorderseite des beidseitig wirkenden Kolbens ein von unter hohem Druck stehenden Kraftstoff in Öffnungsrichtung des Modulationsventils beaufschlagter erster Druckraum und auf der Rückseite des beidseitig wirkenden Kolbens ein von Kraftstoff in Schließrichtung beaufschlagter zweiter Druckraum vorgesehen. Der zweite Druckraum wird während der Verschiebung des beidseitig wirkenden Kolbens im Sinne eines Öffnens des Modulationsventils über einen mit einer Drosselstelle versehenen Ablaufkanal druckentlastet.Another fuel injection system for an internal combustion engine is known from DE 197 34 354 A1, which has a pressure control valve for time-dependent modulation of the fuel quantity injected during the injection process. According to one of the exemplary embodiments described there, an adjusting device for controlling this modulation valve is provided, which contains a piston which is acted upon by fuel on both sides. This controls a valve needle body of the modulation valve on the basis of a resulting difference in force between the pressure forces acting on both sides of the piston. It is double-acting on the front A first pressure chamber acted upon by fuel under high pressure in the opening direction of the modulation valve and a second pressure chamber acted upon by fuel in the closing direction are provided on the rear of the piston acting on both sides. The second pressure chamber is relieved of pressure during the displacement of the piston acting on both sides in the sense of opening the modulation valve via an outlet channel provided with a throttle point.
Aus der DE 199 30 276 A1 ist eine Speichereinspritzeinrichtung ähnlicher Art bekannt, bei welchem zur Realisierung eines zweiten Druckniveaus in der den Kraftstoffinjektor mit unter hohem Druck stehendem Kraftstoff versorgenden Kraftstoffhochdruckleitung ein Schaltventil vorgesehen ist. Bei geschlossenem Schaltventil wird der Kraftstoffinjektor mit einem Restdruck versorgt, der über ein zwischen dem Schaltventil und dem Kraftstoffinjektor in der Kraftstoffhochdruckleitung vorgesehenes Druckhalteventil gehalten wird.From DE 199 30 276 A1, a memory injection device of a similar type is known, in which the fuel injector is used to implement a second pressure level a switching valve is provided under high pressure fuel supplying fuel high pressure line. When the switching valve is closed, the fuel injector is supplied with a residual pressure which is maintained via a pressure-maintaining valve provided in the high-pressure fuel line between the switching valve and the fuel injector.
Die Aufgabe der Erfindung ist es, ein verbessertes Kraftstoff-Einspritzsystem zu schaffen, bei dem die Möglichkeit der Formung des Einspritzdruckverlaufs besteht.The object of the invention is to provide an improved fuel injection system in which there is the possibility of shaping the injection pressure curve.
Diese Aufgabe wird erfindungsgemäß durch das im Anspruch 1 angegebene Kraftstoffeinspritzsystem gelöst.This object is achieved by the fuel injection system specified in claim 1.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Kraftstoffeinspritzsystems sind in den Unteransprüchen gekennzeichnet.Advantageous developments of the fuel injection system according to the invention are characterized in the subclaims.
Durch die Erfindung wird ein Kraftstoffeinspritzsystem für eine Brennkraftmaschine, insbesondere einen Dieselmotor, geschaffen. Das Kraftstoffeinspritzsystem enthält einen über eine Kraftstoffhochdruckleitung mit unter hohem Druck vorgehaltenem Kraftstoff versorgten Kraftstoffinjektor zum Einspritzen des Kraftstoffs in den Brennraum der Brennkraftmaschine während eines Einspritzvorgangs. Weiterhin ist ein in der Kraftstoffhochdruckleitung dem Kraftstoffinjektor vorgeschaltetes Drucksteuerventil zur Steuerung des Drucks des während des Einspritzvorgangs eingespritzten Kraftstoffs vorgesehen. Das Drucksteuerventil enthält einen frei verschieblichen beidseitig wirksamen Kolben und einen in den Strömungsweg der Kraftstoffhochdruckleitung geschalteten Schieber zum Öffnen und Schließen des Durchgangsquerschnitts des Strömungsweges der Kraftstoffhochdruckleitung in Abhängigkeit von der Lage des Kolbens. An der Vorderseite des Kolbens ist ein den Kolben in Öffnungsrichtung des Schiebers beaufschlagender erster Druckraum und an der Rückseite des Kolbens ein den Kolben in Schließrichtung des Schiebers beaufschlagender zweiter Druckraum ausgebildet. Ein Stellventil ist zum Einstellen der Drücke im ersten und/oder zweiten Druckraum im Sinne einer Verschiebung des Kolbens in Öffnungs- oder Schließrichtung vorgesehen. Erfindungsgemäß ist der Schieber einstückig mit dem Kolben ausgebildet, wobei die ersten und zweiten Druckräume an den Enden des Kolbens vorgesehen sind und der Schieber in einem Mittelbereich des Kolbens vorgesehen ist.The invention provides a fuel injection system for an internal combustion engine, in particular a diesel engine. The fuel injection system contains a fuel injector, which is supplied with fuel held under high pressure via a high-pressure fuel line, for injecting the fuel into the combustion chamber of the internal combustion engine during an injection process. Furthermore, a pressure control valve is provided in the high-pressure fuel line upstream of the fuel injector for controlling the pressure of the fuel injected during the injection process. The pressure control valve contains a freely displaceable piston acting on both sides and a slide connected in the flow path of the high-pressure fuel line for opening and closing the passage cross section of the flow path of the high-pressure fuel line depending on the position of the piston. A first pressure chamber acting on the piston in the opening direction of the slide is formed on the front of the piston and a second pressure chamber acting on the piston in the closing direction of the slide is formed on the rear of the piston. A control valve is used to set the pressures in the first and / or second pressure chamber in the sense of a displacement of the piston in the opening or closing direction. According to the invention, the slide is formed in one piece with the piston, the first and second pressure chambers being provided at the ends of the piston and the slide being provided in a central region of the piston.
Gemäß einer bevorzugten Ausführungsform des erfindungsgemäßen Kraftstoffeinspritzsystems steht der an der Vorderseite des Kolbens vorgesehene erste Druckraum über eine erste Strömungsverbindung mit der stromaufwärtigen Seite der Kraftstoffhochdruckleitung in Verbindung, und der an der Rückseite des Kolbens vorgesehene zweite Druckraum steht über eine zweite Strömungsverbindung mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung in Verbindung.According to a preferred embodiment of the fuel injection system according to the invention, the first pressure chamber provided on the front of the piston is connected to the upstream side of the high-pressure fuel line via a first flow connection, and the second pressure chamber provided on the rear of the piston is connected to the downstream side of the via a second flow connection High pressure fuel line in connection.
Vorzugsweise ist das Stellventil zum Einstellen des Drucks des ersten Druckraums vorgesehen.The control valve is preferably provided for setting the pressure of the first pressure chamber.
Gemäß einer bevorzugten Ausführungsform ist das Stellventil in einer an den ersten Druckraum angeschlossenen Entlastungsleitung vorgesehen.According to a preferred embodiment, the control valve is provided in a relief line connected to the first pressure chamber.
Gemäß einer besonders vorteilhaften Ausführungsform des erfindungsgemäßen Kraftstoffeinspritzsystems umfasst das Stellventil eine Proportionalbetätigungseinrichtung.According to a particularly advantageous embodiment of the fuel injection system according to the invention, the control valve comprises a proportional actuation device.
Eine solche Proportionalbetätigungseinrichtung ist insbesondere vorteilhafterweise durch einen Piezo-Aktor gebildet.Such a proportional actuation device is particularly advantageously formed by a piezo actuator.
Vorzugsweise ist in der den ersten Druckraum mit der stromaufwärtigen Seite der Kraftstoffhochdruckleitung in verbindenden ersten Strömungsverbindung eine Zulaufdrossel vorgesehen.
Weiterhin von Vorteil ist es, wenn in der mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung in Verbindung stehenden zweiten Strömungsverbindung eine Dämpfungsdrossel vorgesehen ist.An inlet throttle is preferably provided in the first flow connection connecting the first pressure chamber with the upstream side of the high-pressure fuel line.
It is also advantageous if a damping throttle is provided in the second flow connection which is connected to the downstream side of the high-pressure fuel line.
Gemäß einer besonders bevorzugten Ausführungsform der Erfindung ist die den an der Rückseite des Kolbens vorgesehenen zweiten Druckraum mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung verbindende zweite Strömungsverbindung als ein in dem Kolben verlaufender Strömungskanal ausgebildet.According to a particularly preferred embodiment of the invention, this is the second pressure space provided on the rear of the piston with the downstream side the second high-pressure line connecting the fuel flow connection is designed as a flow channel running in the piston.
Alternativ dazu kann die den an der Rückseite des Kolbens vorgesehenen zweiten Druckraum mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung verbindende zweite Strömungsverbindung als ein außenliegender Kanal ausgebildet sein.Alternatively, the second flow connection connecting the second pressure chamber provided on the rear side of the piston to the downstream side of the high-pressure fuel line can be designed as an external channel.
Es ist von Vorteil, wenn der Strömungsweg der Kraftstoffhochdruckleitung eine Querverbindung durch den Mittelbereich des Kolbens bildet.It is advantageous if the flow path of the high-pressure fuel line forms a cross-connection through the central region of the piston.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist es vorgesehen, dass der die zweite Strömungsverbindung bildende Strömungskanal in Längsrichtung des Kolbens von dem zweiten Druckraum zu der den Strömungsweg der Kraftstoffhochdruckleitung bildenden Querverbindung verläuft.According to a preferred embodiment of the invention, it is provided that the flow channel forming the second flow connection extends in the longitudinal direction of the piston from the second pressure chamber to the cross connection forming the flow path of the high-pressure fuel line.
Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert.In the following an embodiment of the invention is explained with reference to the drawing.
Die Figur zeigt ein schematisiertes Blockschaltbild eines Ausführungsbeispiels des erfindungsgemäßen Kraftstoffeinspritzsystems.The figure shows a schematic block diagram of an embodiment of the fuel injection system according to the invention.
Das Bezugszeichen 1 bedeutet einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine, insbesondere eines Dieselmotors, während eines Einspritzvorgangs. Dem Kraftstoffinjektor 1 wird unter hohem Druck vorgehaltener Kraftstoff über eine Kraftstoffhochdruckleitung 13 zugeführt. Die Kraftstoffhochdruckleitung 13 ist an einen in der Figur nicht eigens dargestellten Hochdruckspeicher angeschlossen, der nach Art eines ölelastischen Hochdruckspeichers arbeitet und in den der Kraftstoff mittels einer, ebenfalls nicht dargestellten Hochdruckpumpe aus einem Kraftstoffvorrat gefördert wird (Common-Rail-System).The reference numeral 1 denotes a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, in particular a diesel engine, during an injection process. Fuel held at high pressure is supplied to the fuel injector 1 via a high-pressure fuel line 13. The high-pressure fuel line 13 is connected to a high-pressure accumulator, not specifically shown in the figure, which is in the manner of an oil-elastic high-pressure accumulator works and in which the fuel is conveyed from a fuel supply by means of a high-pressure pump (also not shown) (common rail system).
Der Kraftstoffinjektor 1 kann in herkömmlicher Weise aufgebaut sein, umfassend eine Einspritzdüse 28, welche bei Entlastung eines in dem Kraftstoffinjektor 1 vorgesehenen Steuerraums 41 geöffnet wird. Dem Steuerraum 41 wird von der Kraftstoffhochdruckleitung 13 über eine Steuerdruckleitung 42, in welcher eine Zulaufdrossel 4 vorgesehen ist, unter hohem Druck stehender Kraftstoff zugeführt. Weiterhin mit dem Steuerraum 41 verbunden ist eine Entlastungsleitung 44, in welche eine Rücklaufdrossel 10 geschaltet ist und die mittels eines Steuerventils 5 zu einer Leckageleitung 48 druckentlastbar ist, wobei eine Steuermenge R anfällt. Das Steuerventil 5 ist über eine Betätigungseinrichtung 8 steuerbar, beispielsweise mittels eines Piezo-Aktors. Beim Öffnen der Düse 28 des Kraftstoffinjektors 1 wird der über die Kraftstoffhochdruckleitung 13 zugeführte Kraftstoff in den Brennraum der Brennkraftmaschine eingespritzt.The fuel injector 1 can be constructed in a conventional manner, comprising an injection nozzle 28, which is opened when a control chamber 41 provided in the fuel injector 1 is relieved. Fuel under high pressure is supplied to the control chamber 41 from the high-pressure fuel line 13 via a control pressure line 42, in which an inlet throttle 4 is provided. Also connected to the control chamber 41 is a relief line 44, into which a return throttle 10 is connected and which can be relieved of pressure by means of a control valve 5 to a leakage line 48, a control quantity R being generated. The control valve 5 can be controlled via an actuating device 8, for example by means of a piezo actuator. When the nozzle 28 of the fuel injector 1 is opened, the fuel supplied via the high-pressure fuel line 13 is injected into the combustion chamber of the internal combustion engine.
In dem Strömungsweg der Kraftstoffhochdruckleitung 13 ist dem Kraftstoffinjektor 1 vorgeschaltet ein Drucksteuerventil 26 vorgesehen. Dieses enthält einen frei verschieblichen beidseitig wirksamen Kolben 30 und, einstückig mit diesem ausgebildet, einen Schieber 32 zum Öffnen und Schließen des Durchgangsquerschnitts des Strömungsweges der Hochdruckleitung 13 in Abhängigkeit von der Lage des Kolbens 30. An der Vorderseite des Kolbens 30 ist ein diesen in Öffnungsrichtung des Schiebers 32 beaufschlagender erster Druckraum 36 vorgesehen, und an der Rückseite des Kolbens 30 ist ein den Kolben 30 in Schließrichtung des Schiebers 32 beaufschlagender zweiter Druckraum 38 ausgebildet.A pressure control valve 26 is provided upstream of the fuel injector 1 in the flow path of the high-pressure fuel line 13. This contains a freely displaceable piston 30 acting on both sides and, integrally formed with it, a slide 32 for opening and closing the passage cross-section of the flow path of the high-pressure line 13 depending on the position of the piston 30. At the front of the piston 30 there is one in the opening direction The first pressure chamber 36 acting on the slide 32 is provided, and a second pressure chamber 38 acting on the piston 30 in the closing direction of the slide 32 is formed on the rear of the piston 30.
Der an der Vorderseite des Kolbens 30 vorgesehene erste Druckraum 36 ist über eine erste Strömungsverbindung 20 mit der stromaufwärtigen Seite der Kraftstoffhochdruckleitung 13 verbunden. Der an der Rückseite des Kolbens 30 vorgesehene zweite Druckraum steht über eine zweite Strömungsverbindung mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung 13 in Verbindung, welche den Kraftstoff zu dem Kraftstoffinjektor 1 liefert.The first pressure chamber 36 provided on the front of the piston 30 is connected to the upstream side of the high-pressure fuel line 13 via a first flow connection 20. The second pressure chamber provided on the rear of the piston 30 is connected to the second via a flow connection downstream side of the high-pressure fuel line 13, which supplies the fuel to the fuel injector 1.
Ein Stellventil 14, 16, welches allgemein zum Einstellen der Druckverhältnisse in den beiden Druckräumen 36, 38 im Sinne einer Verschiebung des Kolbens 30 in Öffnungsoder Schließrichtung dient, ist bei dem in der Figur dargestellten Ausführungsbeispiel zum Einstellen des Drucks des ersten Druckraums 36 in einer an den ersten Druckraum 36 angeschlossenen Entlastungsleitung 40 vorgesehen. Mittels eines Ventilkörpers 14 des Stellventils 14, 16 ist der erste Druckraum 36 über die Entlastungsleitung 40 zu einer Leckageleitung 46 druckentlastbar, wobei eine Steuermenge R anfällt. Das Stellventil enthält weiterhin eine Proportionalbetätigungseinrichtung 16, welche ein proportionales Öffnen und Schließens des Ventilkörpers 14 des Stellventils 14, 16 über einen vorgegebenen Stellbereich gestattet. Die Proportionalbetätigungseinrichtung 16 ist insbesondere durch einen Piezo-Aktor gebildet.A control valve 14, 16, which is generally used to adjust the pressure conditions in the two pressure chambers 36, 38 in the sense of a displacement of the piston 30 in the opening or closing direction, is in the embodiment shown in the figure for adjusting the pressure of the first pressure chamber 36 in one the relief line 40 connected to the first pressure chamber 36 is provided. The first pressure chamber 36 can be relieved of pressure via the relief line 40 to a leakage line 46 by means of a valve body 14 of the control valve 14, 16, a control quantity R being generated. The control valve also contains a proportional actuation device 16, which allows a proportional opening and closing of the valve body 14 of the control valve 14, 16 over a predetermined adjustment range. The proportional actuation device 16 is formed in particular by a piezo actuator.
In der den ersten Druckraum 36 mit der stromaufwärtigen Seite der Kraftstoffhochdruckleitung 13 verbindenden ersten Strömungsverbindung ist eine Zulaufdrossel 18 vorgesehen, über die der erste Druckraum 36 von der Kraftstoffhochdruckleitung 13 mit einer vorgegebenen Kraftstoffmenge pro Zeiteinheit befüllt wird. Aus dem Verhältnis der über die erste Strömungsverbindung 20 dem ersten Druckraum 36 zuströmenden Kraftstoffmenge und der über die Entlastungsleitung 40 und das Stellventil 14, 16 abfließenden Kraftstoffmenge ergibt sich der Druck im ersten Druckraum 36, welcher den Kolben 30 in Öffnungsrichtung des Schiebers 32 beaufschlagt.In the first flow connection connecting the first pressure chamber 36 to the upstream side of the high-pressure fuel line 13, an inlet throttle 18 is provided, via which the first pressure chamber 36 is filled by the high-pressure fuel line 13 with a predetermined amount of fuel per unit of time. The pressure in the first pressure chamber 36, which acts on the piston 30 in the opening direction of the slide 32, results from the ratio of the fuel quantity flowing through the first flow connection 20 to the first pressure chamber 36 and the fuel quantity flowing off via the relief line 40 and the control valve 14, 16.
In der zweiten Strömungsverbindung 22; 24, über welche der zweite Druckraum 38 mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung 13 in Verbindung steht, ist eine Dämpfungsdrossel 27 vorgesehen, welche eine Dämpfung der aus dem zweiten Druckraum 38 zu der stromabwärtigen Seite der Kraftstoffhochdruckleitung 13 bei einer Verschiebung des Kolbens 30 zu- oder abfließenden Kraftstoffmenge bewirkt.In the second flow connection 22; 24, via which the second pressure chamber 38 is connected to the downstream side of the high-pressure fuel line 13, a damping throttle 27 is provided, which dampens or from the second pressure chamber 38 to the downstream side of the high-pressure fuel line 13 when the piston 30 is displaced outflowing fuel quantity causes.
Gemäß einem Ausführungsbeispiel, welches in der Figur mit durchgezogenen Linien dargestellt ist, ist die den an der Rückseite des Kolbens 30 vorgesehenen zweiten Druckraum 38 mit der stromabwärtigen Seite der Kraftstoffhochdruckleitung 13 verbindende zweite Strömungsverbindung als ein Strömungskanal 22 vorgesehen, der in dem Kolben 30 zentral in dessen Längsrichtung verlaufend ausgebildet ist und von dem zweiten Druckraum 38 zu der den Strömungsweg der Kraftstoffhochdruckleitung 13 bildenden Querverbindung führt.According to an exemplary embodiment, which is shown in the figure with solid lines, the second flow connection connecting the second pressure chamber 38 provided on the rear side of the piston 30 to the downstream side of the high-pressure fuel line 13 is provided as a flow channel 22 which is centrally located in the piston 30 the longitudinal direction of which is formed and leads from the second pressure chamber 38 to the cross connection forming the flow path of the high-pressure fuel line 13.
Gemäß einem alternativen Ausführungsbeispiel, welches in der Figur mit gestrichelten Linien dargestellt ist, ist diese zweite Strömungsverbindung als ein außenliegender Kanal 24 ausgebildet, welcher außerhalb des Kolbens 30 von dem zweiten Druckraum 38 zu der stromabwärtigen Seite der Kraftstoffhochdruckleitung 13 führt.According to an alternative exemplary embodiment, which is shown in the figure with dashed lines, this second flow connection is designed as an external channel 24 which leads outside the piston 30 from the second pressure chamber 38 to the downstream side of the high-pressure fuel line 13.
Beim Betrieb des Kraftstoffeinspritzsystems wird der an der Kraftstoffhochdruckleitung 13 unter hohem Druck anstehende Kraftstoff als Arbeitsfluid über die in der ersten Strömungsverbindung 20 vorgesehene Zulaufdrossel 18 dem ersten Druckraum 36 zugeführt. Mittels des Ventilkörpers des Stellventils 14, 16 (2/2-Ventil), das von dem Piezo-Aktor 16 gesteuert wird, kann in dem ersten Druckraum 36 ein beliebiger Druck eingestellt werden. Dieser Druck stellt die Führungsgröße für das proportional arbeitende Drucksteuerventil 26 dar. Der in den Strömungsweg der Kraftstoffhochdruckleitung 13 geschaltete Schieber 32 nimmt eine Stellung ein, die aus der Druckbilanz in den ersten und zweiten Druckräumen 36, 38 an dem beidseitig wirkenden Kolben 30 definiert ist. Daraus ergibt sich eine Verschiebung des Kolbens 30 und damit des einstückig mit diesem ausgebildeten Schiebers 32 so lange, bis ein Druckgleichgewicht zwischen dem ersten Druckraum 36 und dem zweiten Druckraum 38 eingestellt ist. Herrscht im ersten Druckraum 36 ein Überdruck gegenüber dem zweiten Druckraum 38, so bewegt sich der Kolben 30 und zusammen mit diesem der Schieber 32 in Öffnungsrichtung zu dem zweiten Druckraum 38, der Schieber 32 öffnet den Strömungsweg der Kraftstoffhochdruckleitung 13 und sorgt damit wieder für einen Druckausgleich auf höherem Niveau. Damit ist der für den Einspritzvorgang maßgebliche Druck auf der stromabwärtigen Seite des Drucksteuerventils 36 gleichzeitig die Regelgröße für das Proportionalventil 26. Auf diese Weise ist es möglich, nur durch Veränderung der Ansteuerung des Drucksteuerventils 26 über den Piezo-Aktor 16 nahezu beliebige Einspritzverläufe darzustellen.When the fuel injection system is operating, the fuel present at the high-pressure fuel line 13 under high pressure is fed as working fluid to the first pressure chamber 36 via the inlet throttle 18 provided in the first flow connection 20. By means of the valve body of the control valve 14, 16 (2/2 valve), which is controlled by the piezo actuator 16, any pressure can be set in the first pressure chamber 36. This pressure represents the reference variable for the proportional pressure control valve 26. The slide 32 connected in the flow path of the high-pressure fuel line 13 assumes a position which is defined from the pressure balance in the first and second pressure chambers 36, 38 on the piston 30 acting on both sides. This results in a displacement of the piston 30 and thus of the slide 32 formed in one piece with it until a pressure equilibrium is established between the first pressure chamber 36 and the second pressure chamber 38. If there is overpressure in the first pressure chamber 36 with respect to the second pressure chamber 38, the piston 30 and together with this the slide 32 moves in the opening direction to the second pressure chamber 38, the slide 32 opens the flow path of the high-pressure fuel line 13 and thus again ensures pressure compensation at a higher level. The pressure on the downstream side of the pressure control valve 36, which is decisive for the injection process, is thus also the controlled variable for the proportional valve 26 It is possible, by changing the control of the pressure control valve 26 via the piezo actuator 16, to display almost any injection curves.
- 11
- Kraftstoffinjektorfuel injector
- 44
- Zulaufdrosselinlet throttle
- 55
- Steuerventilcontrol valve
- 88th
- Aktoractuator
- 1010
- RücklaufdrosselReturn throttle
- 1313
- KraftstoffhochdruckleitungHigh-pressure fuel line
- 1414
- StellventilControl valve
- 1616
- Aktoractuator
- 1818
- Zulaufdrosselinlet throttle
- 2020
- erste Strömungsverbindungfirst flow connection
- 2222
- zweite Strömungsverbindungsecond flow connection
- 2424
- zweite Strömungsverbindungsecond flow connection
- 2626
- DrucksteuerventilPressure control valve
- 2727
- Dämpfungsdrosseldamping throttle
- 2929
- Dämpfungsdrosseldamping throttle
- 3030
- Kolbenpiston
- 3232
- Schieberpusher
- 3434
- Steuerkantencontrol edges
- 3636
- erster Druckraumfirst pressure room
- 3838
- zweiter Druckraumsecond pressure room
- 4040
- Entlastungsleitungrelief line
- 4141
- Steuerraumcontrol room
- 4242
- SteuerdruckleitungControl pressure line
- 4444
- Entlastungsleitungrelief line
- 4646
- Leckageleitungleakage line
- 4848
- Leckageleitungleakage line
- RR
- Steuermengetax amount
Claims (12)
- Fuel injection system for an internal combustion engine, in particular a diesel engine, with a fuel injector (1), supplied via a high-pressure fuel line (13) with fuel reserved under high pressure, for injecting the fuel into the combustion space of the internal combustion engine during an injection operation, and with a pressure control valve (26), preceding the fuel injector (1) in the high-pressure fuel line (13), for controlling the pressure of the fuel injected during the injection operation, the pressure control valve (26) containing a freely displaceable piston (30) active on both sides and a slide (32), inserted into the flow path of the high-pressure fuel line (13), for increasing (opening) and reducing (closing) the passage cross section of the flow path of the high-pressure fuel line as a function of the position of the piston (30), there being formed, on the front side of the piston (30), a first pressure space (36) acting upon the piston (30) in the opening direction of the slide (32) and, on the rear side of the piston (30), a second pressure space (38) acting upon the piston (30) in the closing direction of the slide (32), and an adjusting valve (14, 16) being provided for setting the pressures in the first and/or the second pressure space (36, 38) with the effect of a displacement of the piston (30) in the opening or the closing direction, characterized in that the slide (32) is produced in one piece with the piston (30), the first and second pressure spaces (36, 38) being provided at the ends of the piston (30), and the slide (32) being provided in a middle region of the piston (30).
- Fuel injection system according to Claim 1, characterized in that the first pressure space (36) provided on the front side of the piston (30) is connected to the upstream side of the high-pressure fuel line (13) via a first flow connection (20), and in that the second pressure space (38) provided on the rear side of the piston (30) is connected to the downstream side of the high-pressure fuel line (13) via a second flow connection (22; 24).
- Fuel injection system according to Claim 1 or 2, characterized in that the adjusting valve (14, 16) is provided for setting the pressure of the first pressure space (36).
- Fuel injection system according to Claim 3, characterized in that the adjusting valve (14, 16) is provided in a relief line (40) connected to the first pressure space (36).
- Fuel injection system according to one of Claims 1 to 4, characterized in that the adjusting valve (14, 16) comprises a proportional actuation device (16).
- Fuel injection system according to Claim 5, characterized in that the proportional actuation device (16) is a piezoelectric actuator.
- Fuel injection system according to one of Claims 2 to 6, characterized in that an inflow throttle (18) is provided in the first flow connection (20) for connecting the first pressure space (36) to the upstream side of the high-pressure fuel line (13).
- Fuel injection system according to one of Claims 2 to 7, characterized in that a damping throttle (27) is provided in the second flow connection (22; 24) connected to the downstream side of the high-pressure fuel line (13).
- Fuel injection system according to one of Claims 2 to 8, characterized in that the second flow connection connecting the second pressure space (38) provided on the rear side of the piston (30) to the downstream side of the high-pressure fuel line (13) is designed as a flow duct (22) running in the piston (30).
- Fuel injection system according to one of Claims 2 to 8, characterized in that the second flow connection connecting the second pressure space (38) provided on the rear side of the piston (30) to the downstream side of the high-pressure fuel line (13) is designed as an external duct (24).
- Fuel injection system according to one of Claims 1 to 10, characterized in that the flow path of the high-pressure fuel line (13) forms a cross connection through the middle region of the piston (30).
- Fuel injection system according to Claim 9 in conjunction with Claim 11, characterized in that the flow duct forming the second flow connection (22) runs in the longitudinal direction of the piston (30) from the second pressure space (38) to the cross connection forming the flow path of the high-pressure fuel line (13).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10117401 | 2001-04-06 | ||
| DE10117401A DE10117401C2 (en) | 2001-04-06 | 2001-04-06 | Fuel injection system for an internal combustion engine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1247978A2 EP1247978A2 (en) | 2002-10-09 |
| EP1247978A3 EP1247978A3 (en) | 2004-01-14 |
| EP1247978B1 true EP1247978B1 (en) | 2004-12-29 |
Family
ID=7680774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02007620A Expired - Fee Related EP1247978B1 (en) | 2001-04-06 | 2002-04-04 | Fuel injection system for an internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6729302B2 (en) |
| EP (1) | EP1247978B1 (en) |
| AT (1) | ATE286207T1 (en) |
| DE (2) | DE10117401C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006003484A1 (en) * | 2005-03-16 | 2006-09-21 | Robert Bosch Gmbh | Device for injecting fuel |
| DE102005058556B4 (en) * | 2005-12-08 | 2017-04-06 | Man Diesel & Turbo Se | Injector of a fuel injection system |
| US8191534B2 (en) * | 2008-02-28 | 2012-06-05 | General Electric Company | High viscosity fuel injection pressure reduction system and method |
| EP2410168A1 (en) * | 2010-07-23 | 2012-01-25 | Wärtsilä Schweiz AG | Fluid dispenser and method for providing an operating fluid using a fluid dispenser |
| DE102013204093B4 (en) * | 2013-03-11 | 2021-03-18 | Mtu Friedrichshafen Gmbh | Method for venting a fuel supply line and an internal combustion engine |
| EP3550136A4 (en) * | 2016-12-02 | 2020-07-29 | Meiji University | Fuel injection device |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49108427A (en) * | 1973-02-19 | 1974-10-15 | ||
| US3792390A (en) * | 1973-05-29 | 1974-02-19 | Allis Chalmers | Magnetic actuator device |
| DE2803049A1 (en) * | 1978-01-25 | 1979-08-09 | Bosch Gmbh Robert | PUMP NOZZLE FOR COMBUSTION MACHINES |
| DE2806788A1 (en) * | 1978-02-17 | 1979-08-23 | Bosch Gmbh Robert | PUMP NOZZLE FOR COMBUSTION MACHINES |
| US4247052A (en) * | 1979-10-09 | 1981-01-27 | General Motors Corporation | Electromagnetic fuel injector |
| US4450783A (en) * | 1982-09-30 | 1984-05-29 | Cummins Engine Company, Inc. | Electronically controlled fuel pump |
| US4559511A (en) * | 1983-04-19 | 1985-12-17 | Westinghouse Electric Corp. | Vacuum contactor having DC electromagnet with improved force watts ratio |
| JP2719924B2 (en) * | 1988-05-10 | 1998-02-25 | 株式会社ゼクセル | Booster unit injector |
| US4928028A (en) * | 1989-02-23 | 1990-05-22 | Hydraulic Units, Inc. | Proportional permanent magnet force actuator |
| US5720261A (en) * | 1994-12-01 | 1998-02-24 | Oded E. Sturman | Valve controller systems and methods and fuel injection systems utilizing the same |
| AT1624U1 (en) * | 1995-03-30 | 1997-08-25 | Avl Verbrennungskraft Messtech | STORAGE INJECTION SYSTEM WITH PRE-INJECTION FOR AN INTERNAL COMBUSTION ENGINE |
| DE19734354A1 (en) * | 1997-08-08 | 1999-02-11 | Mtu Friedrichshafen Gmbh | Internal combustion engine fuel injection system |
| JP3442405B2 (en) * | 1997-08-25 | 2003-09-02 | 三菱電機株式会社 | Duty drive solenoid valve |
| JPH11182376A (en) | 1997-12-15 | 1999-07-06 | Zexel:Kk | Cylinder injection device |
| AT2961U3 (en) * | 1998-07-02 | 1999-11-25 | Avl List Gmbh | STORAGE INJECTION DEVICE |
| JP4445072B2 (en) * | 1998-10-20 | 2010-04-07 | ヴェルトジィレ シュヴァイツ アクチェンゲゼルシャフト | Liquid injection device for diesel engine cylinder and diesel engine |
| DE50000490D1 (en) * | 1999-03-01 | 2002-10-17 | Siemens Ag | ARRANGEMENT AND METHOD FOR CONTROLLING A CONTROL VALVE FOR A DIESEL INJECTION SYSTEM |
| DE19910589C2 (en) * | 1999-03-10 | 2002-12-05 | Siemens Ag | Injection valve for an internal combustion engine |
| DE19921878C2 (en) * | 1999-05-12 | 2001-03-15 | Daimler Chrysler Ag | Fuel injection system for an internal combustion engine |
-
2001
- 2001-04-06 DE DE10117401A patent/DE10117401C2/en not_active Expired - Fee Related
-
2002
- 2002-03-29 US US10/108,548 patent/US6729302B2/en not_active Expired - Fee Related
- 2002-04-04 DE DE50201867T patent/DE50201867D1/en not_active Expired - Fee Related
- 2002-04-04 AT AT02007620T patent/ATE286207T1/en not_active IP Right Cessation
- 2002-04-04 EP EP02007620A patent/EP1247978B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US20020179063A1 (en) | 2002-12-05 |
| DE10117401A1 (en) | 2002-10-17 |
| EP1247978A2 (en) | 2002-10-09 |
| US6729302B2 (en) | 2004-05-04 |
| ATE286207T1 (en) | 2005-01-15 |
| DE50201867D1 (en) | 2005-02-03 |
| EP1247978A3 (en) | 2004-01-14 |
| DE10117401C2 (en) | 2003-02-27 |
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