EP0418601B1 - Injection device for a diesel engine - Google Patents
Injection device for a diesel engine Download PDFInfo
- Publication number
- EP0418601B1 EP0418601B1 EP90116430A EP90116430A EP0418601B1 EP 0418601 B1 EP0418601 B1 EP 0418601B1 EP 90116430 A EP90116430 A EP 90116430A EP 90116430 A EP90116430 A EP 90116430A EP 0418601 B1 EP0418601 B1 EP 0418601B1
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- European Patent Office
- Prior art keywords
- valve
- space
- pressure
- injection device
- nozzle
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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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
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- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
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- 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
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
Definitions
- the invention relates to an injection device for diesel engines, in which the diesel fuel is fed from an injection pump via a constant pressure valve and via a first line to a space in front of the nozzle needle seat of the injection nozzle, and an additional liquid before the start of delivery of the injection pump via a second line under excess pressure to the space in front of the nozzle needle seat via a check valve opening in the direction of this space in predetermined amounts, whereupon the additional liquid and the diesel fuel are injected together under the pressure of the injection pump.
- Such injection devices are known for example from EP-A - 282 819. According to this EP-A, the additional liquid, which is formed here by a second fuel, is conveyed into the space in front of the nozzle via a separate pump, the flow rate being determined by an electromagnetic valve.
- the additional liquid is indeed also supplied to the space in front of the nozzle before the injection pump begins to deliver, but the pressure in the injection line from the injection pump to the nozzle must nevertheless be overcome, so that the pressure generated by the delivery pump must be relatively high. With such a pump delivering at high pressure, there is a risk of cavitation and erosion and such an arrangement is relatively expensive.
- the metering of the additional liquid by the solenoid valve switched on in the supply line from the pump to the space in front of the nozzle is relatively imprecise and delayed, since the path from this solenoid valve to the space in front of the nozzle needle seat weight. Apart from the great effort for the feed pump, the metering from injection cycle to injection cycle is therefore inaccurate.
- the invention aims to achieve an accurate dosage with simple means.
- the invention consists essentially in that the second line is a flywheel (hammer pipe) or is connected to a flywheel, and that the flywheel is connected via a check valve opening towards the flywheel to the pressure source for the additional liquid and between the in Direction to the space in front of the nozzle needle seat opening check valve and a controllable shut-off valve, which connects the swing line with a return line in the open position and causes a pressure surge when closing by converting the kinetic energy of the flowing additional liquid into potential energy, opens into the line section.
- the second line is a flywheel (hammer pipe) or is connected to a flywheel, and that the flywheel is connected via a check valve opening towards the flywheel to the pressure source for the additional liquid and between the in Direction to the space in front of the nozzle needle seat opening check valve and a controllable shut-off valve, which connects the swing line with a return line in the open position and causes a pressure surge when closing by converting the kinetic energy of the flowing additional liquid into potential energy, opens into the line section.
- the feed pump only has to deliver the additional liquid up to a check valve opening in the direction of the flywheel line, and it is therefore not necessary to overcome the closing force of the check valve opening the passage to the nozzle chamber and the pressure prevailing in the injection line from the injection pump to the nozzle.
- the required pressure of the feed pump is therefore relatively low. As long as the controllable kinetic shut-off valve is open, the additional liquid flows back into the tank with high flow energy.
- the diesel fuel and the additional liquid are injected together during the following delivery stroke.
- a pressure surge occurs in the flywheel line between this controllable shut-off valve and the check valve opening in the direction of the flywheel line, so that the time at which the pressure surge opens the check valve opening in the direction of the space in front of the nozzle needle seat and the additional liquid flows into this room, is precisely determined. Since, according to the invention, the amount of additional liquid supplied is determined by the closing time of the controllable shut-off valve, the metering of the additional liquid is also very precise. Above all, this allows the feed pump for the additional liquid to work at very low pressure, so that the risk of cavitation and erosion in this feed pump is largely eliminated.
- the flywheel leads into a channel of the nozzle holder, the end facing the nozzle is closed by the check valve opening in the direction of the space in front of the nozzle needle seat, and the other end can be closed by the controllable shut-off valve.
- the pressure surge that occurs in the flywheel line when the controllable final valve is terminated thus has an immediate effect in this channel.
- the mouth of the flywheel into the channel is expediently arranged closer to the controllable shut-off valve than to the check valve, which improves the effect of the shut-off of the controllable valve.
- the arrangement is expediently such that the flywheel line is connected via the check valve opening in the direction of the flywheel line to a pressure chamber, to which a feed pump delivering the additional liquid is connected, and which is connected to a return line via a pressure control valve.
- the controllable shut-off valve is an electromagnetic valve controlled by a, preferably electronic, control unit.
- the controllable shut-off valve is preferably controlled as a function of an operating variable of the diesel engine, in particular of the load and / or speed. In this way, since the pressure surge in the flywheel occurs suddenly and without delay, it is possible to change the amount of additional liquid supplied at short notice, even from injection cycle to injection cycle, as required.
- the additional liquid can be an alternative fuel, for example an alcohol fuel, by means of which the ignition conditions of the diesel fuel are changed or improved. But it can also be the additional liquid water, which reduces the nitrogen oxide emissions of the engine.
- 1 is an injection pump element, with 2 representing the pump piston and 3 the working space of the pump piston.
- the diesel fuel is drawn in from a tank 4 via a feed pump 5 and a filter 6 and reaches the working space 3 in the usual way.
- the working space 3 is connected to a bore 9 in the nozzle holder 10 via a constant pressure valve 7 and a line 8.
- 11 is the injection nozzle and 12 is the seat of the nozzle needle 13. Via the bore 9, the diesel fuel reaches a space 14 in front of the nozzle needle seat 12.
- a reservoir 15 is a reservoir for the make-up liquid.
- the additional liquid is drawn from this container by a feed pump 16 and conveyed into a pressure chamber 17.
- a return line 18 is connected to the container 15, in which a pressure maintaining valve 19 is switched on.
- the pressure in the pressure chamber 17 is kept constant by this pressure holding valve 19.
- a swing line 20 is connected to the pressure chamber 17 via a check valve 21 opening in the direction of the swing line, which opens into a channel 22 in the nozzle holder 10.
- the channel 22 is connected to the space 14 in front of the nozzle needle seat 12 via a check valve 23 opening in the direction of the nozzle needle seat 12.
- a controllable shutoff valve 24 is arranged, the swing line 20 opening into the channel 22 between the check valve 23 and the controllable shutoff valve 24.
- the controllable closing valve 24 is an electromagnetic valve which is controlled by an electronic control unit 25.
- the additional liquid flows back from the swing line 20 via a return line 26 with high kinetic energy into the container 15.
- the controllable closing valve 24 is suddenly closed, the kinetic of the additional liquid flowing / via the flywheel line 20 and the return line 26 is suddenly converted into potential or static energy.
- the mouth 27 of the swing line 20 in the channel 22 is arranged close to the controllable shutoff valve 24, so that the closure of this controllable shutoff valve 24 has a direct effect.
- the control unit 25 controls both the termination of the controllable termination valve 24 and the opening of the same. It is thus the closing time of the controllable closing valve 24 is determined and thereby the amount of additional liquid supplied to the space 14 is regulated.
- the pressure surge or the pressure increase occurs in the flywheel 20 and in the channel 22 between the check valve 21 and the controllable shut-off valve 24, since this check valve 21 prevents backflow to the pressure chamber 17.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung bezieht sich auf eine Einspritzeinrichtung für Dieselmotoren, bei welcher der Dieselkraftstoff von einer Einspritzpumpe über ein Gleichdruckventil und über eine erste Leitung einem Raum vor dem Düsennadelsitz der Einspritzdüse zugeführt wird, und eine Zusatzflüssigkeit vor Förderbeginn der Einspritzpumpe über eine zweite Leitung unter Überdruck dem Raum vor dem Düsennadelsitz über ein in Richtung zu diesem Raum öffnendes Rückschlagventil in vorbestimmten Mengen zugeführt wird, worauf die Zusatzflüssigkeit und der Dieselkraftstoff gemeinsam unter dem Druck der Einspritzpumpe eingespritzt werden. Solche Einspritzeinrichtungen sind beispielsweise aus der EP-A - 282 819 bekannt. Gemäß dieser EP-A wird die Zusatzflüssigkeit, welche hier von einem zweiten Kraftstoff gebildet ist, über eine gesonderte Pumpe in den Raum vor der Düse gefördert, wobei die Fördermenge durch ein elektromagnetisches Ventil bestimmt wird. Die Zusatzflüssigkeit wird zwar hier auch vor Förderbeginn der Einspritzpumpe dem Raum vor der Düse zugeführt, jedoch ist immerhin der in der Einspritzleitung von der Einspritzpumpe zur Düse anstehende Druck zu überwinden, so daß der von der Förderpumpe erzeugte Druck verhältnismäßig hoch sein muß. Bei einer solchen mit hohem Druck fördernden Pumpe ist die Gefahr von Kavitation und Erosion gegeben und eine solche Anordnung ist verhältnismäßig kostspielig. Die Dosierung der Zusatzflüssigkeit durch das in der Zuführungsleitung von der Pumpe zu dem Raum vor der Düse eingeschaltene Magnetventil ist verhältnismäßig unpräzise und verzögert, da der Weg von diesem Magnetventil bis zu dem Raum vor dem Düsennadelsitz ins Gewicht fällt. Abgsehen vom großen Aufwand für die Förderpumpe ist somit auch die Dosierung von Einspritzzyklus zu Einspritzzyklus ungenau. Die Erfindung zielt darauf ab, mit einfachen Mitteln eine genaue Dosierung zu erreichen. Die Erfindung besteht im wesentlichen darin, daß die zweite Leitung eine Schwungleitung (hammer pipe) ist oder mit einer Schwungleitung verbunden ist, und daß die Schwungleitung über ein in Richtung zur Schwungleitung hin öffnendes Rückschlagventil mit der Druckquelle für die Zusatzflüssigkeit verbunden ist und zwischen dem in Richtung zu dem Raum vor dem Düsennadelsitz öffnenden Rückschlagventil und einem steuerbaren Abschlußventil, welches in Offenstellung die Schwungleitung mit einem Rücklauf verbindet und beim Schließen durch Umsetzung der kinetischen Energie der strömenden Zusatzflüssigkeit in potentielle Energie einen Druckstoß hervorruft, in den Leitungsabschnitt mündet. Die Förderpumpe muß die Zusatzflüssigkeit lediglich bis zu einem in Richtung zur Schwungleitung hin öffnendes Rückschlagventil fördern und es muß daher die Schließkraft des den Durchgang zum Düsenraum hin öffnenden Rückschlagventiles und der in der Einspritzleitung von der Einspritzpumpe zur Düse herrschende Druck nicht überwunden werden. Der erforderliche Druck der Förderpumpe ist daher verhältnismäßig gering. Solange das steuerbare kinetische Abschlußventil offen ist, fließt die Zusatzflüssigkeit mit hoher Strömungsenergie in den Tank zurück. Wenn das steuerbare Abschlußventil plötzlich abgeschlossen wird, entsteht ein hoher Druckstoß in der Schwungleitung zwischen dem steuerbaren Abschlußventil und dem in Richtung zur Schwungleitung öffnenden Rückschlagventil, durch welchen das in Richtung zu dem Raum vor dem Düsennadelsitz öffnende Rückschlagventil geöffnet, und die Zusatzflüssigkeit zu dem Raum vor dem Düsennadelsitz gefördert wird Es wird somit der Effekt der Schwungleitung ausgenutzt, daß beim plötzlichen Abschluß die kinetische Energie in potentielle Energie bzw. statische Energie umgesetzt wird. Hierbei wird der durch das Gleichdruckventil konstant gehaltene Druck in der ersten Leitung überwunden, und ein Teil des durch diese erste Leitung geförderten Dieselkraftstoffes wird in Richtung zur Einspritzpumpe zurückgedrückt, so daß die Zusatzflüssigkeit dem Dieselkraftstoff in dem Raum vor der Düse vorgelagert wird. Der Dieselkraftstoff und die Zusatzflüssigkeit werden beim folgenden Förderhub gemeinsam eingespritzt. Durch den Abschluß des steuerbaren Abschlußventils erfolgt ein Druckstoß in der Schwungleitung zwischen diesem steuerbaren Abschlußventil und dem in Richtung zur Schwungleitung öffnenden Rückschlagventil schlagartig, so daß der Zeitpunkt, zu welchem der Druckstoß das in Richtung zu dem Raum vor dem Düsennadelsitz öffnende Rückschlagventil öffnet und die Zusatzflüssigkeit in diesen Raum strömt, genau bestimmt ist. Da gemäß der Erfindung die Menge der zugeführten Zusatzflüssigkeit durch die Schließdauer des steuerbaren Abschlußventils bestimmt ist, ist damit auch die Dosierung der Zusatzflüssigkeit sehr präzise. Vor allem kann dadurch die Förderpumpe für die Zusatzflüssigkeit mit sehr geringem Druck arbeiten, so daß die Gefahr von Kavitation und Erosion in dieser Förderpumpe weitgehend ausgeschaltet ist. Gemäß einer bevorzugten Ausführungsform der Erfindung mündet die Schwungleitung in einen Kanal des Düsenhalters, dessen der Düse zugewendetes Ende durch das in Richtung zu dem Raum vor dem Düsennadelsitz öffnende Rückschlagventil abgeschlossen ist, und dessen anderes Ende durch das steuerbare Abschlußventil abschließbar ist. Der bei Abschluß des steuerbaren Abschlußventils in der Schwungleitung auftretende Druckstoß wirkt sich somit unmittelbar in diesem Kanal aus. Zweckmäßig ist hiebei die Mündung der Schwungleitung in den Kanal näher zum steuerbaren Abschlußventil angeordnet als zum Rückschlagventil, wodurch der Effekt des Abschlusses des steuerbaren Ventils verbessert wird.The invention relates to an injection device for diesel engines, in which the diesel fuel is fed from an injection pump via a constant pressure valve and via a first line to a space in front of the nozzle needle seat of the injection nozzle, and an additional liquid before the start of delivery of the injection pump via a second line under excess pressure to the space in front of the nozzle needle seat via a check valve opening in the direction of this space in predetermined amounts, whereupon the additional liquid and the diesel fuel are injected together under the pressure of the injection pump. Such injection devices are known for example from EP-A - 282 819. According to this EP-A, the additional liquid, which is formed here by a second fuel, is conveyed into the space in front of the nozzle via a separate pump, the flow rate being determined by an electromagnetic valve. The additional liquid is indeed also supplied to the space in front of the nozzle before the injection pump begins to deliver, but the pressure in the injection line from the injection pump to the nozzle must nevertheless be overcome, so that the pressure generated by the delivery pump must be relatively high. With such a pump delivering at high pressure, there is a risk of cavitation and erosion and such an arrangement is relatively expensive. The metering of the additional liquid by the solenoid valve switched on in the supply line from the pump to the space in front of the nozzle is relatively imprecise and delayed, since the path from this solenoid valve to the space in front of the nozzle needle seat weight. Apart from the great effort for the feed pump, the metering from injection cycle to injection cycle is therefore inaccurate. The invention aims to achieve an accurate dosage with simple means. The invention consists essentially in that the second line is a flywheel (hammer pipe) or is connected to a flywheel, and that the flywheel is connected via a check valve opening towards the flywheel to the pressure source for the additional liquid and between the in Direction to the space in front of the nozzle needle seat opening check valve and a controllable shut-off valve, which connects the swing line with a return line in the open position and causes a pressure surge when closing by converting the kinetic energy of the flowing additional liquid into potential energy, opens into the line section. The feed pump only has to deliver the additional liquid up to a check valve opening in the direction of the flywheel line, and it is therefore not necessary to overcome the closing force of the check valve opening the passage to the nozzle chamber and the pressure prevailing in the injection line from the injection pump to the nozzle. The required pressure of the feed pump is therefore relatively low. As long as the controllable kinetic shut-off valve is open, the additional liquid flows back into the tank with high flow energy. If the controllable shut-off valve is suddenly closed, a high pressure surge occurs in the flywheel line between the controllable shut-off valve and the check valve opening towards the flywheel line, by means of which the check valve opening towards the space in front of the nozzle needle seat opens, and the Additional liquid is conveyed to the space in front of the nozzle needle seat. The effect of the swing line is thus exploited that the kinetic energy is converted into potential energy or static energy in the event of a sudden termination. In this case, the pressure in the first line, which is kept constant by the constant pressure valve, is overcome, and part of the pressure delivered by this first line Diesel fuel is pushed back in the direction of the injection pump, so that the additional liquid is stored upstream of the diesel fuel in the space in front of the nozzle. The diesel fuel and the additional liquid are injected together during the following delivery stroke. By closing the controllable shut-off valve, a pressure surge occurs in the flywheel line between this controllable shut-off valve and the check valve opening in the direction of the flywheel line, so that the time at which the pressure surge opens the check valve opening in the direction of the space in front of the nozzle needle seat and the additional liquid flows into this room, is precisely determined. Since, according to the invention, the amount of additional liquid supplied is determined by the closing time of the controllable shut-off valve, the metering of the additional liquid is also very precise. Above all, this allows the feed pump for the additional liquid to work at very low pressure, so that the risk of cavitation and erosion in this feed pump is largely eliminated. According to a preferred embodiment of the invention, the flywheel leads into a channel of the nozzle holder, the end facing the nozzle is closed by the check valve opening in the direction of the space in front of the nozzle needle seat, and the other end can be closed by the controllable shut-off valve. The pressure surge that occurs in the flywheel line when the controllable final valve is terminated thus has an immediate effect in this channel. The mouth of the flywheel into the channel is expediently arranged closer to the controllable shut-off valve than to the check valve, which improves the effect of the shut-off of the controllable valve.
Gemäß der Erfindung ist die Anordnung zweckmäßig so getroffen, daß die Schwungleitung über das in Richtung zur Schwungleitung öffnende Rückschlagventil an einen Druckraum angeschlossen ist, an welchen eine die Zusatzflüssigkeit fördernde Förderpumpe angeschlossen ist, und welcher über ein Druckhalteventil mit einer Rückflußleitung verbunden ist. Dies hat den Vorteil, daß der Druck, unter welchem die Zusatzflüssigkeit der Schwungleitung zugeführt wird und damit die kinetische Energie der Zusatzflüssigkeit bei offenen Abschlußventil konstant gehalten wird, wodurch auch der beim Abschließen dieses steuerbaren Abschlußventils auftretende Druckstoß eine konstante Höhe aufweist.According to the invention, the arrangement is expediently such that the flywheel line is connected via the check valve opening in the direction of the flywheel line to a pressure chamber, to which a feed pump delivering the additional liquid is connected, and which is connected to a return line via a pressure control valve. This has the advantage that the pressure at which the additional liquid is fed to the flywheel line and thus the kinetic energy of the additional liquid is kept constant when the shut-off valve is open, as a result of which the pressure surge which occurs when this controllable shut-off valve is closed has a constant level.
Gemäß der Erfindung ist das steuerbare Abschlußventil ein von einer, vorzugsweise elektronischen, Steuereinheit gesteuertes elektromagnetisches Ventil. Hiebei ist vorzugsweise das steuerbare Abschlußventil in Abhängigkeit von einer Betriebsgröße des Dieselmotors, insbesondere von der Last und/oder Drehzahl, gesteuert. Da der Druckstoß in der Schwungleitung plötzlich und ohne Verzögerung auftritt, wird es auf diese Weise ermöglicht, die zugeführte Menge der Zusatzflüssigkeit kurzfristig, und zwar sogar von Einspritzzyklus zu Einspritzzyklus je nach Bedarf zu ändern.According to the invention, the controllable shut-off valve is an electromagnetic valve controlled by a, preferably electronic, control unit. The controllable shut-off valve is preferably controlled as a function of an operating variable of the diesel engine, in particular of the load and / or speed. In this way, since the pressure surge in the flywheel occurs suddenly and without delay, it is possible to change the amount of additional liquid supplied at short notice, even from injection cycle to injection cycle, as required.
Die Zusatzflüssigkeit kann ein alternativer Kraftstoff, beispielsweise ein Alkoholkraftstoff, sein, durch welchen die Zündbedingungen des Dieselkraftstoffes verändert bzw. verbessert werden. Es kann aber auch die Zusatzflüssigkeit Wasser sein, wodurch der Stickoxyd-Ausstoß des Motors verringert wird.The additional liquid can be an alternative fuel, for example an alcohol fuel, by means of which the ignition conditions of the diesel fuel are changed or improved. But it can also be the additional liquid water, which reduces the nitrogen oxide emissions of the engine.
In der Zeichnung ist die Erfindung an Hand eines schematischen Ausführungsbeispieles erläutert.In the drawing, the invention is explained using a schematic exemplary embodiment.
1 ist ein Einspritzpumpenelement, wobei 2 den Pumpenkolben und 3 den Arbeitsraum des Pumpenkolbens darstellt. Von einem Tank 4 wird der Dieselkraftstoff über eine Förderpumpe 5 und ein Filter 6 angesaugt und gelangt in üblicher Weise in den Arbeitsraum 3. Der Arbeitsraum 3 ist über ein Gleichdruckventil 7 und eine Leitung 8 mit einer Bohrung 9 im Düsenhalter 10 verbunden. 11 ist die Einspritzdüse und 12 der Sitz der Düsennadel 13. Über die Bohrung 9 gelangt der Dieselkraftstoff in einen Raum 14 vor dem Düsennadelsitz 12.1 is an injection pump element, with 2 representing the pump piston and 3 the working space of the pump piston. The diesel fuel is drawn in from a tank 4 via a feed pump 5 and a filter 6 and reaches the working space 3 in the usual way. The working space 3 is connected to a bore 9 in the nozzle holder 10 via a constant pressure valve 7 and a line 8. 11 is the injection nozzle and 12 is the seat of the
15 ist ein Behälter für die Zusatzflüssigkeit. Aus diesem Behälter wird die Zusatzflüssigkeit durch eine Förderpumpe 16 angesaugt und in einen Druckraum 17 gefördert. An diesen Druckraum 17 ist eine Rückflußleitung 18 zum Behälter 15 angeschlossen, in welche ein Druckhalteventil 19 eingeschaltet ist. Durch dieses Druckhalteventil 19 wird der Druck im Druckraum 17 konstant gehalten.15 is a reservoir for the make-up liquid. The additional liquid is drawn from this container by a
Eine Schwungleitung 20 ist über ein in Richtung zur Schwungleitung öffnendes Rückschlagventil 21 an den Druckraum 17 angschlossen, welche in einen Kanal 22 im Düsenhalter 10 mündet. Der Kanal 22 ist an den Raum 14 vor dem Düsennadelsitz 12 über ein in Richtung zum Düsennadelsitz 12 öffnendes Rückschlagventil 23 angeschlossen. An dem von der Einspritzdüse 11 abgewendeten Ende des Kanals 22 ist ein steuerbares Abschlußventil 24 angeordnet, wobei die Schwungleitung 20 in den Kanal 22 zwischen dem Rückschlagventil 23 und dem steuerbaren Abschlußventil 24 mündet.A
Das steuerbare Abschlußventil 24 ist ein elektromagnetisches Ventil, welches durch eine elektronische Steuereinheit 25 gesteuert wird.The
Solange das steuerbare Abschlußventil 24 geöffnet ist, fließt die Zusatzflüssigkeit von der Schwungleitung 20 über eine Rückflußleitung 26 mit hoher kinetischer Energie in den Behälter 15 zurück. Wenn das steuerbare Abschlußventil 24 plötzlich geschlossen wird, wird die kinetische der/über die Schwungleitung 20 und die Rückflußleitung 26 strömenden Zusatzflüssigkeit schlagartig in potentielle bzw. statische Energie umgewandelt. Es entsteht ein Druckstoß in der Schwungleitung 20 und im Kanal 22, welcher in Anbetracht der hohen kinetischen Energie der strömenden Zusatzflüssigkeit sehr groß ist und das Rückschlagventil 23 öffnet, so daß die Zusatzflüssigkeit in den Raum 14 vor dem Düsensitz 12 gelangt. Die Mündung 27 der Schwungleitung 20 in den Kanal 22 ist nahe zum steuerbaren Abschlußventil 24 angeordnet, so daß sich der Abschluß dieses steuerbaren Abschlußventils 24 unmittelbar auswirkt.As long as the
Die Steuereinheit 25 steuert sowohl den Abschluß des steuerbaren Abschlußventils 24 als auch das Öffnen desselben. Es wird somit durch die Steuereinheit 25 die Schließdauer des steuerbaren Abschlußventils 24 bestimmt und dadurch wird die Menge der dem Raum 14 zugeführten Zusatzflüssigkeit geregelt. Der Druckstoß bzw. die Druckerhöhung tritt in der Schwungleitung 20 und im Kanal 22 zwischen dem Rückschlagventil 21 und dem steuerbaren Abschlußventil 24 auf, da dieses Rückschlagventil 21 eine Rückströmung zum Druckraum 17 verhindert.The
- 1 Einspritzpumpenelement1 injection pump element
- 2 Pumpenkolben2 pump pistons
- 3 Arbeitsraum3 work space
- 4 Dieselkraftstofftank4 diesel fuel tank
- 5 Förderpumpe5 feed pump
- 6 Filter6 filters
- 7 Gleichdruckventil7 constant pressure valve
- 8 Dieselkraftstoffleitung8 Diesel fuel line
- 9 Bohrung für Dieselkraftstoff9 hole for diesel fuel
- 10 Düsenhalter10 nozzle holders
- 11 Düse11 nozzle
- 12 Düsennadelsitz12 nozzle needle seat
- 13 Düsennadel13 nozzle needle
- 14 Raum vor Düsennadelsitz14 Room in front of nozzle needle seat
- 15 Behälter für Zusatzflüssigkeit15 reservoirs for additional liquid
- 16 Förderpumpe16 feed pump
- 17 Druckraum17 pressure chamber
- 18 Rückflußleitung18 return line
- 19 Druckhalteventil19 pressure control valve
- 20 Schwungleitung20 swing line
- 21 Rückschlagventil21 check valve
- 22 Kanal22 channel
- 23 Rückschlagventil23 check valve
- 24 steuerbares Abschlußventil24 controllable shut-off valve
- 25 Steuereinheit25 control unit
- 26 Rückflußleitung26 return line
- 27 Mündung der Schwungleitung27 Muzzle of the swing line
Claims (7)
- Injection device for Diesel engines, having- an injection pump (1), by means of which Diesel fuel can be supplied via a constant pressure valve (7) and via a first conduit (8, 9) to a space (14) before the nozzle needle seat (12) of an injection nozzle (11),- having a second conduit (20) which can be connected at one end to a pressure source (16) for an additive fluid and whose other end emerges into a conduit section (22) which can be connected to the space (14) before the nozzle needle seat (12) via a non-return valve (23) opening in the direction of this space (14)- and a control unit (25) which controls the supply of the additive fluid in such a way that a specified quantity of the additive fluid reaches the space (14) before the nozzle needle seat (12) before the beginning of delivery by the injection pump (1) so that the additive fluid and the Diesel fuel are injected into the Diesel engine together under the pressure of the injection pump (1), characterised in that the second conduit (20) is a hammer pipe or is connected to a hammer pipe (20) and in that the hammer pipe (20) is connected to the pressure source (16) for the additive fluid via a non-return valve (21) opening in the direction of the hammer pipe (20) and enters the conduit section (22) between the non-return valve (23) opening in the direction of the space (14) before the nozzle needle seat (12) and a controllable shut-off valve (24) which, in the open position, connects the hammer pipe (20) to a return (26) and, on closing, causes a pressure surge by conversion of the kinetic energy of the flowing additive fluid into potential energy.
- Injection device according to Claim 1, characterised in that the hammer pipe (20) enters a duct (22), of the nozzle holder (10), whose end facing towards the nozzle (11) is closed by the non-return valve (23) opening in the direction of the space (14) before the nozzle needle seat (12) and whose other end can be closed by the controllable shut-off valve (24).
- Injection device according to Claim 2, characterised in that the opening (25) of the hammer pipe (20) into the duct (22) is located nearer to the controllable shut-off valve (24) than it is to the non-return valve (23).
- Injection device according to Claim 1, 2 or 3, characterised in that the hammer pipe (20) is connected via the non-return valve (21) opening in the direction of the hammer pipe (20) to a pressure space (17) to which is connected a feed pump (16) delivering the additive fluid and which is connected to a return flow conduit (18) via a pressure retention valve (19).
- Injection device according to Claim 1, 2 or 3, characterised in that the quantity of the additive fluid supplied is determined by the closing duration of the controllable shut-off valve (24).
- Injection device according to one of Claims 1 to 5, characterised in that the controllable shut-off valve (24) is a solenoid valve controlled by a control unit (27 [sic]), preferably electronic.
- Injection device according to one of Claims 1 to 6, characterised in that the controllable shut-off valve (24) is controlled as a function of an operating parameter of the Diesel engine, in particular the load and/or rotational speed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3931456A DE3931456A1 (en) | 1989-09-21 | 1989-09-21 | INJECTION DEVICE FOR DIESEL ENGINES |
| DE3931456 | 1989-09-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0418601A1 EP0418601A1 (en) | 1991-03-27 |
| EP0418601B1 true EP0418601B1 (en) | 1992-11-11 |
Family
ID=6389852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90116430A Expired - Lifetime EP0418601B1 (en) | 1989-09-21 | 1990-08-28 | Injection device for a diesel engine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0418601B1 (en) |
| JP (1) | JP3145102B2 (en) |
| DE (2) | DE3931456A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0488831A1 (en) * | 1990-11-30 | 1992-06-03 | Automobiles Peugeot | Method and device for feeding a dosed additive in an injection circuit for a compression ignition engine |
| EP0528150A1 (en) * | 1991-07-23 | 1993-02-24 | Mitsubishi Jukogyo Kabushiki Kaisha | System and method for feeding fuel to a fine-particle-mixed fuel burning diesel engine |
| US5251576A (en) * | 1991-06-14 | 1993-10-12 | Mitsubishi Jukogyo Kabushiki Kaisha | System and method for feeding fuel to a fine-particle-mixed fuel burning diesel engine |
| DE4435823C1 (en) * | 1994-10-07 | 1995-12-14 | Mtu Friedrichshafen Gmbh | Bi=fluid injector for diesel IC engines |
| GB2322411A (en) * | 1997-02-20 | 1998-08-26 | Bosch Gmbh Robert | I.c. engine fuel-injection valve with additional supply line eg for water |
| WO2001038721A2 (en) * | 1999-11-24 | 2001-05-31 | Robert Bosch Gmbh | Injector for high-pressure fuel injection |
| US6390384B1 (en) * | 1996-10-14 | 2002-05-21 | Komatsu Ltd. | Fuel injection device for diesel engine |
| CN105003370A (en) * | 2015-07-09 | 2015-10-28 | 胡松平 | Double-fuel integrated electronic control ejector |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2772114B2 (en) * | 1990-05-23 | 1998-07-02 | 三菱重工業株式会社 | Water injection diesel engine |
| DE4329407C1 (en) * | 1993-09-01 | 1995-03-09 | Hjs Fahrzeugteile Gmbh | Method for cleaning a soot filter in exhaust systems of an internal combustion engine operated with diesel fuel and device for carrying out the method |
| DE4337048C2 (en) * | 1993-10-29 | 1996-01-11 | Daimler Benz Ag | Fuel injection system for an internal combustion engine |
| DE4425339C2 (en) * | 1994-02-11 | 1998-10-22 | Mtu Friedrichshafen Gmbh | Injection system |
| EP0694123A1 (en) * | 1994-02-11 | 1996-01-31 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Injection system |
| DE4407052C1 (en) * | 1994-03-03 | 1995-03-09 | Mtu Friedrichshafen Gmbh | Injection system for the injection of a fuel and a liquid additive into the combustion chambers of an internal combustion engine |
| FR2740178B1 (en) * | 1995-10-24 | 1998-01-02 | Peugeot Motocycles Sa | FUEL INJECTION SYSTEM IN AN INTERNAL COMBUSTION ENGINE |
| DE19625698B4 (en) * | 1996-06-27 | 2005-09-22 | Robert Bosch Gmbh | Injection device for the combined injection of fuel and additional fluid |
| DE19746491A1 (en) * | 1997-10-22 | 1999-04-29 | Bosch Gmbh Robert | Dual fluid injection system for diesel engine of vehicle |
| DE10330511A1 (en) * | 2003-07-05 | 2005-02-10 | Man B & W Diesel Ag | Internal combustion engine |
| EP1612407B1 (en) | 2004-06-30 | 2006-08-23 | C.R.F. Società Consortile per Azioni | Fuel pressure regulating system for an internal combustion engine |
| CN101975130B (en) * | 2010-10-29 | 2012-05-02 | 郑国璋 | Electronic control high-pressure common rail fuel injecting device |
| CN102937061B (en) * | 2012-11-27 | 2015-02-18 | 东风汽车公司 | Methanol supply device for fuel-methanol dual-fuel engine and using method of methanol supply device |
| US20160069310A1 (en) * | 2014-09-09 | 2016-03-10 | Avl Powertrain Engineering, Inc. | Fuel injector with diesel pilot injection |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH433865A (en) * | 1965-07-14 | 1967-04-15 | Max Prof Berchtold | Fuel injection system for internal combustion engines |
| JPS5113806B2 (en) * | 1971-10-20 | 1976-05-04 | ||
| JP2538908B2 (en) * | 1987-03-15 | 1996-10-02 | 三菱重工業株式会社 | Two-fuel engine injection system |
-
1989
- 1989-09-21 DE DE3931456A patent/DE3931456A1/en not_active Withdrawn
-
1990
- 1990-08-28 EP EP90116430A patent/EP0418601B1/en not_active Expired - Lifetime
- 1990-08-28 DE DE9090116430T patent/DE59000457D1/en not_active Expired - Lifetime
- 1990-09-21 JP JP25046690A patent/JP3145102B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0488831A1 (en) * | 1990-11-30 | 1992-06-03 | Automobiles Peugeot | Method and device for feeding a dosed additive in an injection circuit for a compression ignition engine |
| US5251576A (en) * | 1991-06-14 | 1993-10-12 | Mitsubishi Jukogyo Kabushiki Kaisha | System and method for feeding fuel to a fine-particle-mixed fuel burning diesel engine |
| EP0528150A1 (en) * | 1991-07-23 | 1993-02-24 | Mitsubishi Jukogyo Kabushiki Kaisha | System and method for feeding fuel to a fine-particle-mixed fuel burning diesel engine |
| DE4435823C1 (en) * | 1994-10-07 | 1995-12-14 | Mtu Friedrichshafen Gmbh | Bi=fluid injector for diesel IC engines |
| US6390384B1 (en) * | 1996-10-14 | 2002-05-21 | Komatsu Ltd. | Fuel injection device for diesel engine |
| GB2322411A (en) * | 1997-02-20 | 1998-08-26 | Bosch Gmbh Robert | I.c. engine fuel-injection valve with additional supply line eg for water |
| GB2322411B (en) * | 1997-02-20 | 1999-03-17 | Bosch Gmbh Robert | Fuel-injection valve for internal combustion engines |
| WO2001038721A2 (en) * | 1999-11-24 | 2001-05-31 | Robert Bosch Gmbh | Injector for high-pressure fuel injection |
| WO2001038721A3 (en) * | 1999-11-24 | 2001-12-27 | Bosch Gmbh Robert | Injector for high-pressure fuel injection |
| US6698673B1 (en) | 1999-11-24 | 2004-03-02 | Robert Bosch Gmbh | Injector for fuel injection taking place under high pressure |
| CN105003370A (en) * | 2015-07-09 | 2015-10-28 | 胡松平 | Double-fuel integrated electronic control ejector |
| CN105003370B (en) * | 2015-07-09 | 2018-01-02 | 胡松平 | Double fuel integral type electrically controlled injector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03121251A (en) | 1991-05-23 |
| JP3145102B2 (en) | 2001-03-12 |
| DE3931456A1 (en) | 1991-04-04 |
| EP0418601A1 (en) | 1991-03-27 |
| DE59000457D1 (en) | 1992-12-17 |
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