EP1260702B1 - A fuel injection system for an internal combustion engine - Google Patents

A fuel injection system for an internal combustion engine Download PDF

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Publication number
EP1260702B1
EP1260702B1 EP02008632A EP02008632A EP1260702B1 EP 1260702 B1 EP1260702 B1 EP 1260702B1 EP 02008632 A EP02008632 A EP 02008632A EP 02008632 A EP02008632 A EP 02008632A EP 1260702 B1 EP1260702 B1 EP 1260702B1
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EP
European Patent Office
Prior art keywords
valve
pressure
control
space
fuel
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EP02008632A
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German (de)
French (fr)
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EP1260702A3 (en
EP1260702A2 (en
Inventor
Nestor Rodriguez-Amaya
Roger Potschin
Juergen Gruen
Ulrich Projahn
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1260702A3 publication Critical patent/EP1260702A3/en
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Classifications

    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically

Definitions

  • the invention relates to a fuel injection device for Internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is described by DE-A1-4118236 known.
  • This fuel injection device has for each cylinder of the internal combustion engine on a fuel pump, the one by the internal combustion engine in a reciprocating motion driven pump piston having a pump working space limited, the fuel from a fuel tank is supplied and connected to a fuel injection valve is.
  • the fuel injection valve has an injection valve member , is controlled by the at least one injection port and that by the one in a connected to the pump working space Pressure chamber prevailing pressure against a closing force in one Opening direction is movable. It is a first electric controlled control valve provided by a connection of the Pump work space is controlled with a discharge space.
  • first control valve Between the pump working space and the first control valve is a arranged to the first control valve opening pressure-retaining valve, by the one opposite to the pressure prevailing in the discharge space increased pressure is maintained. It's also a second one electrically controlled control valve provided by the likewise a connection of the pump work space with a discharge space is controlled.
  • first control valve When the first control valve is open and the second Control valve is closed, it is a fuel injection with the pressure level determined by the pressure holding valve. If both the first control valve and the second control valve is closed, so is a fuel injection with the by the stroke of the pump piston certain pressure curve.
  • the Opening and closing movement of the injection valve member of Fuel injector is controlled by the in the pump workspace controlled pressure prevailing, wherein the injection valve member opens when the force generated by the pressure on this is greater than the bias of a closing spring.
  • the one in the pump workroom prevailing pressure is through the first and second control valves controlled.
  • the opening and closing movement of Injection valve member and the pressure buildup in the pump working space are thus coupled with each other and can not independently to be controlled.
  • EP-A2-957261 is also a Fuel injection known.
  • These Fuel injection device has a fuel pump for each cylinder of the internal combustion engine, the one by the internal combustion engine in a lifting movement having driven pump piston, the one Pump work space limited to the fuel from one Fuel tank is supplied.
  • the Pump work space is with a fuel injector connected, having an injection valve member, through the at least one injection port is controlled and that by the one connected to the pump working space Pressure chamber prevailing pressure against a closing force in Opening direction is movable.
  • It is also a second electrically controlled one Control valve provided by the in one Control pressure chamber is controlled controlling pressure, by the injection valve member at least indirectly in Closing direction is acted upon.
  • a disadvantage of this known fuel injection device is that through the Use of unpressurized fuel tank or the pressure side of a feed pump as a discharge space of the Pressure in the pump work space and in the associated with this Areas of the fuel injection device in the Connection with the discharge space drops sharply and thus the danger of cavitation exists. In addition, the Efficiency of the fuel injector thereby not optimal.
  • the fuel injection device with the Features according to claim 1 has the advantage that by the second control valve one from the pressure in the pump working space independent control of the opening and closing movement of the Injection valve member is enabled and that by the Check valve a decoupling of the pump working space of the allowed by the pressure holding valve maintained pressure level is, whereby leakage in the fuel pump can be avoided can.
  • the check valve from the Pressure holding valve maintained pressure level in the pressure chamber also at Suction stroke of the pump piston can be ensured.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation according to a first Embodiment
  • Figure 2 shows a curve of a pressure Injection openings of a fuel injection valve of Fuel injection device
  • Figure 3 in part a modified version of Fuel injection device
  • Figure 4 in part another modified version of Krafscherinspritz sensible.
  • FIGs 1,3 and 4 is a Fuel injection device for an internal combustion engine a motor vehicle shown.
  • the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the Fuel injection device is preferably as trained so-called pump-line-nozzle system and has one for each cylinder of the internal combustion engine Fuel pump 10, a fuel injection valve 12 and a the fuel injection valve 12 with the Fuel pump 10 connecting line 14.
  • the Fuel pump 10 has one in a cylinder 16 tight guided pump piston 18, which by a cam 20 a camshaft of the internal combustion engine against the force a return spring 19 driven in a lifting movement becomes.
  • the pump piston 18 limited in the cylinder 16 a Pump work chamber 22, in which the delivery stroke of Pump piston 18 fuel is compressed under high pressure.
  • the pump working chamber 22 is by means of the delivery pressure of a Feed pump 21 fuel from a Fuel tank 9 of the motor vehicle supplied. It can be provided that by the feed pump 21st Fuel from the fuel tank 9 in a Memory area 24 is promoted, in which a pressure according to the delivery pressure of the feed pump 21, for example, may be about 4 to 6 bar. From the Storage area 24 reaches fuel during the intake stroke of Pump piston 18 in the pump chamber 22. Between the Storage area 24 and the pump chamber 22 is a for Pump working chamber 22 opening check valve 23 arranged. In the line 14 is a from the Pump workspace 22 opening another check valve 25th arranged. The delivery line 13 from the feed pump 21 opens between the pump working chamber 22 and the other Check valve 25.
  • the pump working space 22 can alternatively also via a through the pump piston 18th controlled connection to the storage area 24 for filling 18 be connected to the suction stroke of the pump piston.
  • the Pump piston 18 acts with a control edge with a in the pump working chamber 22 opening opening of the compound to the storage area 24 through the pump piston 18 is closed or released.
  • the check valve 23 can be omitted.
  • the fuel injection valve 12 is separate from the Fuel pump 10 is arranged and via the line 14 with connected to the pump working space 22.
  • the Fuel injection valve 12 has a valve body 26 on, which may be formed in several parts, in the one Injection valve member 28 in a bore 30th is guided longitudinally displaceable.
  • the valve body 26 indicates its the combustion chamber of the cylinder of the internal combustion engine facing end region at least one, preferably a plurality Injection openings 32.
  • the injection valve member 28 has at its the combustion chamber end facing a For example, about conical sealing surface 34, which with one in the valve body 26 in the combustion chamber facing End region formed valve seat 36 cooperates, from or after which the injection openings 32 dissipate.
  • valve body 26 is between the injection valve member 28 and the bore 30 to the valve seat 36 toward an annular space 38th present, in its the valve seat 36 facing away End region by a radial extension of the bore 30 in a pressure chamber 40 surrounding the injection valve member 28 passes.
  • the injection valve member 28 has the height of the Pressure chamber 40 by a cross-sectional reduction a Pressure shoulder 42 on.
  • a biased Closing spring 44 At the end of the combustion chamber facing away from the Injector member 28 engages a biased Closing spring 44, through which the injection valve member 28th is pressed toward the valve seat 36.
  • the closing spring 44 is arranged in a spring chamber 46 of the valve body 26, the adjoins the bore 30.
  • a further bore 48 in which a Piston 50 is tightly guided, with the Injection valve member 28 is connected.
  • the piston 50 limited with its the injection valve member 28 facing away Front side a control pressure chamber 52 in the valve body 26.
  • Im Valve body 26, a channel 54 is formed, in which the Line 14 to the fuel pump 10 opens and in the Pressure chamber 40 opens.
  • the Fuel injector has a near the Fuel pump 10 arranged first control valve 60, for example, be integrated into the fuel pump 10 can.
  • first control valve 60 Through the first control valve 60 is a connection 59 of the pump working chamber 22 of the fuel pump 10 with controlled a discharge space, as the at least indirectly the memory area 24 can serve.
  • the compound 59 branches downstream of the check valve 25 from the line 14 from.
  • connection 59 is upstream of the first Control valve 60, a pressure holding valve 62 is arranged.
  • the Pressure holding valve 62 for example, by a Closing spring 63 loaded valve member 64 which against the Force of the closing spring 63 to the first control valve 60 out in Opening direction is movable.
  • the pressure holding valve 62nd becomes one compared to the pressure in the discharge chamber 24 increased Pressure in the line 14 and thus also in the pressure chamber 40th maintained.
  • the first control valve 60 is electrically controllable and has an actuator 61, which is an electromagnet or a Piezoelectric actuator can be, which is electrically controlled and through which a valve member of the control valve 60 is movable.
  • the first control valve 60 may be pressure compensated or not be formed pressure balanced.
  • the first control valve 60 is formed as a 2/2-way valve and by this In a first switching position, the connection 59 to Relief space 24 opened and in a second Switching position is the connection 59 to the discharge space 24th separated.
  • the control valve 60 is powered by an electric Control device 66 in dependence on operating parameters the internal combustion engine controlled.
  • a second control valve 68 is provided, through which a Connection 70 of the control pressure chamber 52 with a Relief space, for example, the relief space 24, is controlled.
  • the second control valve 68 is electrical controllable and has an actuator 69, the one Electromagnet or a piezoelectric actuator can be, the electric is controlled and by a valve member of the Control valve 68 is movable.
  • the second control valve 68 is preferably formed pressure balanced.
  • the second Control valve 68 is designed as a 2/2-way valve, by the connection 70 in a first switching position the control pressure chamber 52 is opened with the discharge chamber 24 is and by that in a second switching position the Connection 70 of the control pressure chamber 52 with the Relief space 24 is disconnected.
  • a Throttle 58 In compound 59 of the Control pressure space 52 with the line 14 is a Throttle 58 and provided in the connection 70 of the Control pressure space 52 with the fuel tank 24 is between the control pressure chamber 52 and the second control valve 68 another throttle point 71 is provided.
  • the second Control valve 68 is also controlled by the controller 66 controlled.
  • the control of the control valves 60,68 through the controller 66 is dependent on Operating parameters of the internal combustion engine, such as For example, speed, load and temperature.
  • the Pressure retention valve 62 set pressure If that by the Pressure retention valve 62 set pressure is exceeded, so opens the pressure-holding valve 62 and fuel flows through the opened first control valve 60 and the connection 59 in the relief space 24. Subsequently remains in the Line 14 and the pressure chamber 40 prevailing pressure at least almost constant.
  • the opening pressure of the pressure holding valve 62 is due to the bias of its closing spring 63rd certainly.
  • the pre-injection takes place with a through the Pressure retention valve 62 limited pressure.
  • the second Control valve 68 is controlled by the control device 66 open, so that in the control pressure chamber 52 despite its Make connection 56 with the line 14 no high pressure can, but this reduced to the discharge space 24 down becomes.
  • the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the discharge space 24th is separated and in the control pressure chamber 52 via the Compound 56 with the line 14 builds high pressure.
  • a force of the closing spring 44th generates supportive force so that the Injection valve member 28 against its opening direction 29th moved and with its sealing surface 34 on the valve seat 36 to Plant comes and the pre-injection is finished.
  • the second Control valve 68 opened by the controller 66, so that the control pressure chamber 52 is relieved again and the Fuel injection valve 12 opens.
  • the first control valve 60 may be open at the beginning of the main injection, so the connection 59 to the relief space 24 is open and in the conduit 14 and the pressure chamber 40 of the Fuel injection valve 12 through the pressure-holding valve 62 established pressure.
  • the main injection begins then with a pressure level as well as the pre-injection is done.
  • the main injection starts when closed first control valve 60 with a higher pressure level than at initially opened first control valve 60.
  • the controller 66 Subsequently becomes the first control valve 60 by the controller 66 closed, so that the connection 59 with the Relief space 24 is disconnected and the main injection continues with a pressure as he according to the Profile of the cam 20 in the pump working chamber 22 is generated. It can also be provided that initially the first Control valve 60 is closed, but the second Control valve 68 is still closed, so that no Injection takes place. The second control valve 68 then becomes delayed until it opens, causing the beginning of the Main injection is delayed and also the Main injection starts at a higher pressure.
  • the Main injection corresponds in Figure 2 one with II designated injection phase, wherein the pressure curve with shown by the solid line in the event that the first control valve 60 is opened at the beginning, and the Pressure curve with dashed line in case is shown that the first control valve 60 is already closed Beginning is closed.
  • the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the discharge space 24th is separated and in the control pressure chamber 52 by the Connection with the line 14 and thus the Pump work space 22 builds high pressure, through which the Fuel injection valve 12 is closed.
  • the first Control valve 60 remains closed, so that the Connection 59 to the accumulator 62 is disconnected.
  • the second control valve 68 through the Control device 66 opened again, so that the Control pressure chamber 52 is relieved again and the Fuel injection valve 12 opens.
  • the post-injection takes place with a pressure curve corresponding to the profile of Cam 20.
  • the second control valve 68 by the control device 66 closed and / or the first control valve 60 through the Control device 66 opened.
  • the post-injection corresponds to a designated in Figure 2 with III Injection phase.
  • FIG. 3 shows another embodiment of the invention Fuel injection device shown in which the basic structure essentially the same as in the the above-explained embodiment is, however, the arrangement and training the second control valve 168 modified is.
  • the second control valve 168 is electrically controllable and has an actuator 169, which is an electromagnet or may be a piezoelectric actuator, which is electrically controlled and by a valve member of the control valve 168 movable is.
  • the second control valve 168 is in the connection 56 the control pressure chamber 52 is arranged with the channel 54.
  • the second control valve 168 is as a 3/2-way valve formed by the in a first switching position the Connection 56 of the control pressure chamber 52 with the channel 54 and so that the pump working chamber 22 is open and the Control pressure chamber 52 is separated from the discharge chamber 24.
  • a second switching position of the second control valve 168 is the control pressure chamber 52 with the discharge space 24th connected and the connection 56 to the channel 54 and thus to Pump workspace 22 is disconnected.
  • FIG 4 is a further embodiment of Fuel injection device shown in which the basic structure essentially the same as in the Embodiment of Figure 1 is, however, the arrangement and Training the second control valve 268 is modified.
  • the second control valve 268 is electrically controllable and has an actuator 269, which is an electromagnet or a Piezoelectric actuator can be, which is electrically controlled and by a valve member of the control valve 268 movable is.
  • actuator 269 which is an electromagnet or a Piezoelectric actuator can be, which is electrically controlled and by a valve member of the control valve 268 movable is.
  • the Line 14 connected and on the other hand is to this the Channel 54 to the pressure chamber 40 and the connection 56 to Control pressure chamber 52 connected.
  • the second control valve 268 is formed as a 3/2-way valve, through which in a first switching position, the connection 56 of the Control pressure chamber 52 is open with the channel 54 and the Channel 54 from the line 14 and thus from the pump working space 22 is disconnected. In a second switching position of the second Control valve 268 is through this the control pressure chamber 52nd separated from the channel 54 and the channel 54 is with the line 14 and thus connected to the pump working space 22.
  • the Control pressure chamber 52 has a connection 270 with the Relief 24 on, in the one to the relief space 24th opening check valve 272 is arranged and also a throttle point may be provided.
  • the second control valve 268 To enable the opening of the fuel injection valve 12 is the second control valve 268 by the controller 66 in brought his second switch position in which the Control pressure chamber 52 is separated from the channel 54 and the channel 54 is connected to the line 14 so that the of the Fuel pump 10 generated pressure in the pressure chamber 40 of the Fuel injection valve 12 passes, the Control pressure chamber 52 is relieved in the discharge chamber 24.
  • the second control valve 268 To close the fuel injection valve 12 is the second control valve 268 in its first switching position brought in the control pressure chamber 52 with the channel 54th However, the channel 54 is connected from the line 14th is disconnected.
  • the in the pressure room 40 of the Fuel injection valve 12 prevailing pressure acts also in the control pressure chamber 52, causing the Fuel injection valve 12 is closed. Otherwise is the operation of the fuel injection device according to this modified version same as in accordance with FIG. 1

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft ein Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen nach der Gattung des Anspruchs 1.The invention relates to a fuel injection device for Internal combustion engine according to the preamble of claim 1.

Eine solche Kraftstoffeinspritzeinrichtung ist durch die DE-A1-4118236 bekannt. Diese Kraftstoffeinspritzeinrichtung weist für jeden Zylinder der Brennkraftmaschine eine Kraftstoffpumpe auf, die einen durch die Brennkraftmaschine in einer Hubbewegung angetriebenen Pumpenkolben aufweist, der einen Pumpenarbeitsraum begrenzt, dem Kraftstoff aus einem Kraftstoffvorratsbehälter zugeführt wird und der mit einem Kraftstoffeinspritzventil verbunden ist. Das Kraftstoffeinspritzventil weist ein Einspritzventilglied auf, durch das wenigstens eine Einspritzöffnung gesteuert wird und das durch den in einem mit dem Pumpenarbeitsraum verbundenen Druckraum herrschenden Druck gegen eine Schließkraft in einer Öffnungsrichtung bewegbar ist. Es ist ein erstes elektrisch gesteuertes Steuerventil vorgesehen, durch das eine Verbindung des Pumpenarbeitsraums mit einem Entlastungsraum gesteuert wird. Zwischen dem Pumpenarbeitsraum und dem ersten Steuerventil ist ein zum ersten Steuerventil hin öffnendes Druckhalteventil angeordnet, durch das ein gegenüber dem im Entlastungsraum herrschenden Druck erhöhter Druck aufrechterhalten wird. Es ist außerdem ein zweites elektrisch gesteuertes Steuerventil vorgesehen, durch das ebenfalls eine Verbindung des Pumpenarbeitsraums mit einem Entlastungsraum gesteuert wird. Wenn das erste Steuerventil geöffnet und das zweite Steuerventil geschlossen ist, so erfolgt eine Kraftstoffeinspritzung mit dem durch das Druckhalteventil bestimmten Druckniveau. Wenn sowohl das erste Steuerventil als auch das zweite Steuerventil geschlossen ist, so erfolgt eine Kraftstoffeinspritzung mit dem durch den Hub des Pumpenkolbens bestimmten Druckverlauf. Die Öffnungs- und Schließbewegung des Einspritzventilglieds des Kraftstoffeinspritzventils wird durch den im Pumpenarbeitsraum herrschenden Druck gesteuert, wobei das Einspritzventilglied öffnet wenn die durch den Druck auf dieses erzeugte Kraft größer ist als die Vorspannung einer Schließfeder. Der im Pumpenarbeitsraum herrschende Druck wird durch das erste und zweite Steuerventil gesteuert. Die Öffnungs- und Schließbewegung des Einspritzventilglieds und der Druckaufbau im Pumpenarbeitsraum sind somit miteinander gekoppelt und können nicht unabhängig voneinander gesteuert werden.Such a fuel injection device is described by DE-A1-4118236 known. This fuel injection device has for each cylinder of the internal combustion engine on a fuel pump, the one by the internal combustion engine in a reciprocating motion driven pump piston having a pump working space limited, the fuel from a fuel tank is supplied and connected to a fuel injection valve is. The fuel injection valve has an injection valve member , is controlled by the at least one injection port and that by the one in a connected to the pump working space Pressure chamber prevailing pressure against a closing force in one Opening direction is movable. It is a first electric controlled control valve provided by a connection of the Pump work space is controlled with a discharge space. Between the pump working space and the first control valve is a arranged to the first control valve opening pressure-retaining valve, by the one opposite to the pressure prevailing in the discharge space increased pressure is maintained. It's also a second one electrically controlled control valve provided by the likewise a connection of the pump work space with a discharge space is controlled. When the first control valve is open and the second Control valve is closed, it is a fuel injection with the pressure level determined by the pressure holding valve. If both the first control valve and the second control valve is closed, so is a fuel injection with the by the stroke of the pump piston certain pressure curve. The Opening and closing movement of the injection valve member of Fuel injector is controlled by the in the pump workspace controlled pressure prevailing, wherein the injection valve member opens when the force generated by the pressure on this is greater than the bias of a closing spring. The one in the pump workroom prevailing pressure is through the first and second control valves controlled. The opening and closing movement of Injection valve member and the pressure buildup in the pump working space are thus coupled with each other and can not independently to be controlled.

Durch die EP-A2-957261 ist ebenfalls eine Kraftstoffeinspritzeinrichtung bekannt. By EP-A2-957261 is also a Fuel injection known.

Diese Kraftstoffeinspritzeinrichtung weist eine Kraftstoffpumpe für jeden Zylinder der Brennkraftmaschine auf, die einen durch die Brennkraftmaschine in einer Hubbewegung angetriebenen Pumpenkolben aufweist, der einen Pumpenarbeitsraum begrenzt, dem Kraftstoff aus einem Kraftstoffvorratsbehälter zugeführt wird. Der Pumpenarbeitsraum ist mit einem Kraftstoffeinspritzventil verbunden, das ein Einspritzventilglied aufweist, durch das wenigstens eine Einspritzöffnung gesteuert.wird und das durch den in einem mit dem Pumpenarbeitsraum verbundenen Druckraum herrschenden Druck gegen eine Schließkraft in Öffnungsrichtung bewegbar ist. Es ist ein erstes elektrisch gesteuertes Steuerventil vorgesehen, durch das eine Verbindung des Pumpenarbeitsraums mit dem Kraftstoffvorratsbehälter als Entlastungsraum gesteuert wird. Es ist außerdem ein zweites elektrisch gesteuertes Steuerventil vorgesehen, durch das der in einem Steuerdruckraum herrschende Steuerdruck gesteuert wird, durch den das Einspritzventilglied zumindest mittelbar in Schließrichtung beaufschlagt ist. Nachteilig bei dieser bekannten Kraftstoffeinspritzeinrichtung ist, daß durch die Verwendung des drucklosen Kraftstoffvorratsbehälters oder der Druckseite einer Förderpumpe als Entlastungsraum der Druck im Pumpenarbeitsraum und in den mit diesem verbundenen Bereichen der Kraftstoffeinspritzeinrichtung bei der Verbindung mit dem Entlastungsraum stark abfällt und somit die Gefahr von Kavitation besteht. Außerdem ist der Wirkungsgrad der Kraftstoffeinspritzeinrichtung hierdurch nicht optimal.These Fuel injection device has a fuel pump for each cylinder of the internal combustion engine, the one by the internal combustion engine in a lifting movement having driven pump piston, the one Pump work space limited to the fuel from one Fuel tank is supplied. Of the Pump work space is with a fuel injector connected, having an injection valve member, through the at least one injection port is controlled and that by the one connected to the pump working space Pressure chamber prevailing pressure against a closing force in Opening direction is movable. It is a first electric controlled control valve provided by the one Connection of the pump work space with the Fuel tank controlled as a relief space becomes. It is also a second electrically controlled one Control valve provided by the in one Control pressure chamber is controlled controlling pressure, by the injection valve member at least indirectly in Closing direction is acted upon. A disadvantage of this known fuel injection device is that through the Use of unpressurized fuel tank or the pressure side of a feed pump as a discharge space of the Pressure in the pump work space and in the associated with this Areas of the fuel injection device in the Connection with the discharge space drops sharply and thus the danger of cavitation exists. In addition, the Efficiency of the fuel injector thereby not optimal.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzeinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass durch das zweite Steuerventil eine vom Druck im Pumpenarbeitsraum unabhängige Steuerung der Öffnungs- und Schließbewegung des Einspritzventilglieds ermöglicht ist und dass durch das Rückschlagventil eine Abkopplung des Pumpenarbeitsraums von dem durch das Druckhalteventil aufrechterhaltenen Druckniveau ermöglicht ist, wodurch Leckverluste in der Kraftstoffpumpe vermieden werden können. Außerdem kann durch das Rückschlagventil das vom Druckhalteventil gehaltene Druckniveau im Druckraum auch beim Saughub des Pumpenkolbens sichergestellt werden.The fuel injection device according to the invention with the Features according to claim 1 has the advantage that by the second control valve one from the pressure in the pump working space independent control of the opening and closing movement of the Injection valve member is enabled and that by the Check valve a decoupling of the pump working space of the allowed by the pressure holding valve maintained pressure level is, whereby leakage in the fuel pump can be avoided can. In addition, by the check valve from the Pressure holding valve maintained pressure level in the pressure chamber also at Suction stroke of the pump piston can be ensured.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung gemäß einer ersten Ausführungsform, Figur 2 einen Verlauf eines Druckes an Einspritzöffnungen eines Kraftstoffeinspritzventils der Kraftstoffeinspritzeinrichtung, Figur 3 ausschnittsweise eine modifizierte Ausführung der Kraftstoffeinspritzeinrichtung und Figur 4 ausschnittsweise eine weitere modifizierte Ausführung der Krafstoffeinspritzeinrichtung.An embodiment of the invention is in the drawing shown and in the following description in more detail explained. FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation according to a first Embodiment, Figure 2 shows a curve of a pressure Injection openings of a fuel injection valve of Fuel injection device, Figure 3 in part a modified version of Fuel injection device and Figure 4 in part another modified version of Krafstoffeinspritzeinrichtung.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In den Figuren 1,3 und 4 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine ist vorzugsweise eine selbstzündende Brennkraftmaschine. Die Kraftstoffeinspritzeinrichtung ist vorzugsweise als sogenanntes Pumpe-Leitung-Düse-System ausgebildet und weist für jeden Zylinder der Brennkraftmaschine jeweils eine Kraftstoffpumpe 10, ein Kraftstoffeinspritzventil 12 und eine das Kraftstoffeinspritzventil 12 mit der Kraftstoffpumpe 10 verbindende Leitung 14 auf. Die Kraftstoffpumpe 10 weist einen in einem Zylinder 16 dicht geführten Pumpenkolben 18 auf, der durch einen Nocken 20 einer Nockenwelle der Brennkraftmaschine entgegen der Kraft einer Rückstellfeder 19 in einer Hubbewegung angetrieben wird. Der Pumpenkolben 18 begrenzt im Zylinder 16 einen Pumpenarbeitsraum 22, in dem beim Förderhub des Pumpenkolbens 18 Kraftstoff unter Hochdruck verdichtet wird. Dem Pumpenarbeitsraum 22 wird mittels des Förderdrucks einer Förderpumpe 21 Kraftstoff aus einem Kraftstoffvorratsbehälter 9 des Kraftfahrzeugs zugeführt. Es kann vorgesehen sein, daß durch die Förderpumpe 21 Kraftstoff aus dem Kraftstoffvorratsbehälter 9 in einen Speicherbereich 24 gefördert wird, in dem ein Druck entsprechend dem Förderdruck der Förderpumpe 21 herrscht, der beispielsweise etwa 4 bis 6 bar betragen kann. Aus dem Speicherbereich 24 gelangt Kraftstoff beim Saughub des Pumpenkolbens 18 in den Pumpenarbeitsraum 22. Zwischen dem Speicherbereich 24 und dem Pumpenarbeitsraum 22 ist ein zum Pumpenarbeitsraum 22 öffnendes Rückschlagventil 23 angeordnet. In der Leitung 14 ist ein aus dem Pumpenarbeitsraum 22 öffnendes weiteres Rückschlagventil 25 angeordnet. Die Förderleitung 13 von der Förderpumpe 21 mündet zwischen dem Pumpenarbeitsraum 22 und dem weiteren Rückschlagventil 25. Der Pumpenarbeitsraum 22 kann alternativ auch über eine durch den Pumpenkolben 18 gesteuerte Verbindung zum Speicherbereich 24 zur Befüllung beim Saughub des Pumpenkolbens 18 verbindbar sein. Der Pumpenkolben 18 wirkt dabei mit einer Steuerkante mit einer in den Pumpenarbeitsraum 22 mündenden Öffnung der Verbindung zum Speicherbereich 24 zusammen, die durch den Pumpenkolben 18 verschlossen oder freigegeben wird. Das Rückschlagventil 23 kann dabei entfallen.In Figures 1,3 and 4 is a Fuel injection device for an internal combustion engine a motor vehicle shown. The internal combustion engine is preferably a self-igniting internal combustion engine. The Fuel injection device is preferably as trained so-called pump-line-nozzle system and has one for each cylinder of the internal combustion engine Fuel pump 10, a fuel injection valve 12 and a the fuel injection valve 12 with the Fuel pump 10 connecting line 14. The Fuel pump 10 has one in a cylinder 16 tight guided pump piston 18, which by a cam 20 a camshaft of the internal combustion engine against the force a return spring 19 driven in a lifting movement becomes. The pump piston 18 limited in the cylinder 16 a Pump work chamber 22, in which the delivery stroke of Pump piston 18 fuel is compressed under high pressure. The pump working chamber 22 is by means of the delivery pressure of a Feed pump 21 fuel from a Fuel tank 9 of the motor vehicle supplied. It can be provided that by the feed pump 21st Fuel from the fuel tank 9 in a Memory area 24 is promoted, in which a pressure according to the delivery pressure of the feed pump 21, for example, may be about 4 to 6 bar. From the Storage area 24 reaches fuel during the intake stroke of Pump piston 18 in the pump chamber 22. Between the Storage area 24 and the pump chamber 22 is a for Pump working chamber 22 opening check valve 23 arranged. In the line 14 is a from the Pump workspace 22 opening another check valve 25th arranged. The delivery line 13 from the feed pump 21 opens between the pump working chamber 22 and the other Check valve 25. The pump working space 22 can alternatively also via a through the pump piston 18th controlled connection to the storage area 24 for filling 18 be connected to the suction stroke of the pump piston. Of the Pump piston 18 acts with a control edge with a in the pump working chamber 22 opening opening of the compound to the storage area 24 through the pump piston 18 is closed or released. The check valve 23 can be omitted.

Das Kraftstoffeinspritzventil 12 ist getrennt von der Kraftstoffpumpe 10 angeordnet und über die Leitung 14 mit dem Pumpenarbeitsraum 22 verbunden. Das Kraftstoffeinspritzventil 12 weist einen Ventilkörper 26 auf, der mehrteilig ausgebildet sein kann, in dem ein Einspritzventilglied 28 in einer Bohrung 30 längsverschiebbar geführt ist. Der Ventilkörper 26 weist an seinem dem Brennraum des Zylinders der Brennkraftmaschine zugewandten Endbereich wenigstens eine, vorzugsweise mehrere Einspritzöffnungen 32 auf. Das Einspritzventilglied 28 weist an seinem dem Brennraum zugewandten Endbereich eine beispielsweise etwa kegelförmige Dichtfläche 34 auf, die mit einem im Ventilkörper 26 in dessen dem Brennraum zugewandtem Endbereich ausgebildeten Ventilsitz 36 zusammenwirkt, von dem oder nach dem die Einspritzöffnungen 32 abführen. Im Ventilkörper 26 ist zwischen dem Einspritzventilglied 28 und der Bohrung 30 zum Ventilsitz 36 hin ein Ringraum 38 vorhanden, der in seinem dem Ventilsitz 36 abgewandten Endbereich durch eine radiale Erweiterung der Bohrung 30 in einen das Einspritzventilglied 28 umgebenden Druckraum 40 übergeht. Das Einspritzventilglied 28 weist auf Höhe des Druckraums 40 durch eine Querschnittsverringerung eine Druckschulter 42 auf. Am dem Brennraum abgewandten Ende des Einspritzventilglieds 28 greift eine vorgespannte Schließfeder 44 an, durch die das Einspritzventilglied 28 zum Ventilsitz 36 hin gedrückt wird. Die Schließfeder 44 ist in einem Federraum 46 des Ventilkörpers 26 angeordnet, der sich an die Bohrung 30 anschließt. An den Federraum 46 schließt sich an dessen der Bohrung 30 abgewandtem Ende im Ventilkörper 26 eine weitere Bohrung 48 an, in der ein Kolben 50 dicht geführt ist, der mit dem Einspritzventilglied 28 verbunden ist. Der Kolben 50 begrenzt mit seiner dem Einspritzventilglied 28 abgewandten Stirnseite einen Steuerdruckraum 52 im Ventilkörper 26. Im Ventilkörper 26 ist ein Kanal 54 ausgebildet, in den die Leitung 14 zur Kraftstoffpumpe 10 mündet und der in den Druckraum 40 mündet.The fuel injection valve 12 is separate from the Fuel pump 10 is arranged and via the line 14 with connected to the pump working space 22. The Fuel injection valve 12 has a valve body 26 on, which may be formed in several parts, in the one Injection valve member 28 in a bore 30th is guided longitudinally displaceable. The valve body 26 indicates its the combustion chamber of the cylinder of the internal combustion engine facing end region at least one, preferably a plurality Injection openings 32. The injection valve member 28 has at its the combustion chamber end facing a For example, about conical sealing surface 34, which with one in the valve body 26 in the combustion chamber facing End region formed valve seat 36 cooperates, from or after which the injection openings 32 dissipate. in the Valve body 26 is between the injection valve member 28 and the bore 30 to the valve seat 36 toward an annular space 38th present, in its the valve seat 36 facing away End region by a radial extension of the bore 30 in a pressure chamber 40 surrounding the injection valve member 28 passes. The injection valve member 28 has the height of the Pressure chamber 40 by a cross-sectional reduction a Pressure shoulder 42 on. At the end of the combustion chamber facing away from the Injector member 28 engages a biased Closing spring 44, through which the injection valve member 28th is pressed toward the valve seat 36. The closing spring 44 is arranged in a spring chamber 46 of the valve body 26, the adjoins the bore 30. To the spring chamber 46 closes at the bore 30 facing away from the end in Valve body 26 a further bore 48, in which a Piston 50 is tightly guided, with the Injection valve member 28 is connected. The piston 50 limited with its the injection valve member 28 facing away Front side a control pressure chamber 52 in the valve body 26. Im Valve body 26, a channel 54 is formed, in which the Line 14 to the fuel pump 10 opens and in the Pressure chamber 40 opens.

Vom Kanal 54 des Kraftstoffeinspritzventils 12 zweigt eine Verbindung 56 zum Steuerdruckraum 52 ab. Die Kraftstoffeinspritzeinrichtung weist ein nahe der Kraftstoffpumpe 10 angeordnetes erstes Steuerventil 60 auf, das beispielsweise in die Kraftstoffpumpe 10 integriert sein kann. Durch das erste Steuerventil 60 wird eine Verbindung 59 des Pumpenarbeitsraums 22 der Kraftstoffpumpe 10 mit einem Entlastungsraum gesteuert, als der zumindest mittelbar der Speicherbereich 24 dienen kann. Die Verbindung 59 zweigt stromabwärts des Rückschlagventils 25 von der Leitung 14 ab. In der Verbindung 59 ist stromaufwärts vor dem ersten Steuerventil 60 ein Druckhalteventil 62 angeordnet. Das Druckhalteventil 62 weist beispielsweise ein durch eine Schließfeder 63 belastetes Ventilglied 64 auf, das gegen die Kraft der Schließfeder 63 zum ersten Steuerventil 60 hin in Öffnungsrichtung bewegbar ist. Durch das Druckhalteventil 62 wird ein gegenüber dem Druck im Entlastungsraum 24 erhöhter Druck in der Leitung 14 und damit auch im Druckraum 40 aufrechterhalten.From the channel 54 of the fuel injection valve 12 branches one Connection 56 to the control pressure chamber 52 from. The Fuel injector has a near the Fuel pump 10 arranged first control valve 60, for example, be integrated into the fuel pump 10 can. Through the first control valve 60 is a connection 59 of the pump working chamber 22 of the fuel pump 10 with controlled a discharge space, as the at least indirectly the memory area 24 can serve. The compound 59 branches downstream of the check valve 25 from the line 14 from. In connection 59 is upstream of the first Control valve 60, a pressure holding valve 62 is arranged. The Pressure holding valve 62, for example, by a Closing spring 63 loaded valve member 64 which against the Force of the closing spring 63 to the first control valve 60 out in Opening direction is movable. By the pressure holding valve 62nd becomes one compared to the pressure in the discharge chamber 24 increased Pressure in the line 14 and thus also in the pressure chamber 40th maintained.

Das erste Steuerventil 60 ist elektrisch steuerbar und weist einen Aktor 61 auf, der ein Elektromagnet oder ein Piezoaktor sein kann, der elektrisch angesteuert wird und durch den ein Ventilglied des Steuerventils 60 bewegbar ist. Das erste Steuerventil 60 kann druckausgeglichen oder nicht druckausgeglichen ausgebildet sein. Das erste Steuerventil 60 ist als ein 2/2-Wegeventil ausgebildet und durch dieses wird in einer ersten Schaltstellung die Verbindung 59 zum Entlastungsraum 24 geöffnet und in einer zweiten Schaltstellung wird die Verbindung 59 zum Entlastungsraum 24 getrennt. Das Steuerventil 60 wird durch eine elektrische Steuereinrichtung 66 in Abhängigkeit von Betriebsparametern der Brennkraftmaschine gesteuert.The first control valve 60 is electrically controllable and has an actuator 61, which is an electromagnet or a Piezoelectric actuator can be, which is electrically controlled and through which a valve member of the control valve 60 is movable. The first control valve 60 may be pressure compensated or not be formed pressure balanced. The first control valve 60 is formed as a 2/2-way valve and by this In a first switching position, the connection 59 to Relief space 24 opened and in a second Switching position is the connection 59 to the discharge space 24th separated. The control valve 60 is powered by an electric Control device 66 in dependence on operating parameters the internal combustion engine controlled.

Zur Steuerung des Druckes im Steuerdruckraum 52 ist ein zweites Steuerventil 68 vorgesehen, durch das eine Verbindung 70 des Steuerdruckraums 52 mit einem Entlastungsraum, beispielsweise dem Entlastungsraum 24, gesteuert wird. Das zweite Steuerventil 68 ist elektrisch steuerbar und weist einen Aktor 69 auf, der ein Elektromagnet oder ein Piezoaktor sein kann, der elektrisch angesteuert wird und durch den ein Ventilglied des Steuerventils 68 bewegbar ist. Das zweite Steuerventil 68 ist vorzugsweise druckausgeglichen ausgebildet. Das zweite Steuerventil 68 ist als ein 2/2-Wegeventil ausgebildet, durch das in einer ersten Schaltstellung die Verbindung 70 des Steuerdruckraums 52 mit dem Entlastungsraum 24 geöffnet ist und durch das in einer zweiten Schaltstellung die Verbindung 70 des Steuerdruckraums 52 mit dem Entlastungsraum 24 getrennt ist. In der Verbindung 59 des Steuerdruckraums 52 mit der Leitung 14 ist eine Drosselstelle 58 vorgesehen und in der Verbindung 70 des Steuerdruckraums 52 mit dem Kraftstoffvorratsbehälter 24 ist zwischen dem Steuerdruckraum 52 und dem zweiten Steuerventil 68 eine weitere Drosselstelle 71 vorgesehen. Das zweite Steuerventil 68 wird ebenfalls durch die Steuereinrichtung 66 gesteuert. Die Steuerung der Steuerventile 60,68 durch die Steuereinrichtung 66 erfolgt abhängig von Betriebsparametern der Brennkraftmaschine, wie beispielsweise Drehzahl, Last und Temperatur.To control the pressure in the control pressure chamber 52 is a second control valve 68 is provided, through which a Connection 70 of the control pressure chamber 52 with a Relief space, for example, the relief space 24, is controlled. The second control valve 68 is electrical controllable and has an actuator 69, the one Electromagnet or a piezoelectric actuator can be, the electric is controlled and by a valve member of the Control valve 68 is movable. The second control valve 68 is preferably formed pressure balanced. The second Control valve 68 is designed as a 2/2-way valve, by the connection 70 in a first switching position the control pressure chamber 52 is opened with the discharge chamber 24 is and by that in a second switching position the Connection 70 of the control pressure chamber 52 with the Relief space 24 is disconnected. In compound 59 of the Control pressure space 52 with the line 14 is a Throttle 58 and provided in the connection 70 of the Control pressure space 52 with the fuel tank 24 is between the control pressure chamber 52 and the second control valve 68 another throttle point 71 is provided. The second Control valve 68 is also controlled by the controller 66 controlled. The control of the control valves 60,68 through the controller 66 is dependent on Operating parameters of the internal combustion engine, such as For example, speed, load and temperature.

Nachfolgend wird die Funktion der Kraftstoffeinspritzeinrichtung erläutert. Beim Saughub des Pumpenkolbens 18 wird aus dem Speicherbereich 24 Kraftstoff durch das geöffnete Rückschlagventil 23 über die Leitung 13 in den Pumpenarbeitsraum 22 zugeführt. Beim Förderhub des Pumpenkolbens 18 schließt das Rückschlagventil 23 und das Rückschlagventil 25 öffnet, wobei das erste Steuerventil 60 geöffnet ist, so daß die Verbindung 59 mit dem Entlastungsraum 24 geöffnet ist. Die Kraftstoffeinspritzung beginnt mit einer Voreinspritzung, wobei das erste Steuerventil 60 durch die Steuereinrichtung 66 geöffnet ist, so daß die Verbindung 59 zum Entlastungsraum 24 geöffnet ist. Im Pumpenarbeitsraum 22 und in der Leitung 14 sowie im Druckraum 40 des Kraftstoffeinspritzventils 12 kann sich somit nur ein Druck aufbauen, wie er durch das Druckhalteventil 62 eingestellt wird. Wenn der durch das Druckhalteventil 62 eingestellte Druck überschritten wird, so öffnet das Druckhalteventil 62 und Kraftstoff strömt durch das geöffnete erste Steuerventil 60 und die Verbindung 59 in den Entlastungsraum 24. Nachfolgend bleibt der in der Leitung 14 und dem Druckraum 40 herrschende Druck zumindest annähernd konstant. Der Öffnungsdruck des Druckhalteventils 62 wird durch die Vorspannung von dessen Schließfeder 63 bestimmt. Die Voreinspritzung erfolgt mit einem durch das Druckhalteventil 62 begrenzten Druck. Das zweite Steuerventil 68 wird durch die Steuereinrichtung 66 geöffnet, so daß sich im Steuerdruckraum 52 trotz dessen Verbindung 56 mit der Leitung 14 kein Hochdruck aufbauen kann, sondern dieser zum Entlastungsraum 24 hin abgebaut wird. Durch die Drosselstellen 58 und 71 wird erreicht, daß aus dem Kanal 54 nur eine geringe Kraftstoffmenge in den Entlastungsraum 24 abfließen kann. Wenn der im Druckraum 40 herrschende Druck eine derartige Höhe erreicht hat, daß dieser über die Druckschulter 42 auf das Einspritzventilglied 28 eine in Öffnungsrichtung 29 wirkende Kraft ausübt, die größer ist als die Kraft der Schließfeder 44, so hebt das Einspritzventilglied 28 mit seiner Dichtfläche 34 vom Ventilsitz 36 ab und Kraftstoff wird durch die Einspritzöffnungen 32 in den Brennraum des Zylinders der Brennkraftmaschine eingespritzt. Der Öffnungsdruck des Kraftstoffeinspritzventils 12 ist bei geöffnetem zweitem Steuerventil 68 von der Kraft der Schließfeder 44 und der durch den im Steuerdruckraum 52 herrschenden Restdruck auf den Kolben 50 erzeugten Kraft abhängig.Below is the function of Fuel injection device explained. During the suction stroke of the Pump piston 18 is from the storage area 24 fuel through the open check valve 23 via the line thirteenth fed into the pump working chamber 22. During the delivery stroke of the Pump piston 18 closes the check valve 23 and the Check valve 25 opens, wherein the first control valve 60th is open, so that the connection 59 with the Relief space 24 is open. The fuel injection begins with a pre-injection, the first Control valve 60 is opened by the control device 66, so that the connection 59 to the relief space 24 is opened is. In the pump working chamber 22 and in the line 14 and in the Pressure chamber 40 of the fuel injection valve 12 may be thus only build up a pressure, as he through the Pressure holding valve 62 is adjusted. If that by the Pressure retention valve 62 set pressure is exceeded, so opens the pressure-holding valve 62 and fuel flows through the opened first control valve 60 and the connection 59 in the relief space 24. Subsequently remains in the Line 14 and the pressure chamber 40 prevailing pressure at least almost constant. The opening pressure of the pressure holding valve 62 is due to the bias of its closing spring 63rd certainly. The pre-injection takes place with a through the Pressure retention valve 62 limited pressure. The second Control valve 68 is controlled by the control device 66 open, so that in the control pressure chamber 52 despite its Make connection 56 with the line 14 no high pressure can, but this reduced to the discharge space 24 down becomes. By the throttle points 58 and 71 it is achieved that from the channel 54 only a small amount of fuel in the Relief space 24 can drain. When in the pressure room 40th prevailing pressure has reached such a level that this on the pressure shoulder 42 on the Injection valve member 28 acting in the opening direction 29 Exerts force that is greater than the force of the closing spring 44, so lifts the injection valve member 28 with his Sealing surface 34 from the valve seat 36 and fuel is through the injection openings 32 into the combustion chamber of Cylinder of the internal combustion engine injected. Of the Opening pressure of the fuel injection valve 12 is at opened second control valve 68 from the force of Closing spring 44 and by the control pressure in the space 52nd prevailing residual pressure on the piston 50 generated force dependent.

In Figur 2 ist der Verlauf des Druckes p an den Einspritzöffnungen 32 des Kraftstoffeinspritzventils 12 über der Zeit t während einem Einspritzzyklus dargestellt. Die Voreinspritzung entspricht dabei einer in Figur 2 mit I bezeichneten Einspritzphase.In Figure 2, the course of the pressure p to the Injection openings 32 of the fuel injection valve 12 via time t during an injection cycle. The Pre-injection corresponds to one in Figure 2 with I designated injection phase.

Zur Beendigung der Voreinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geschlossen, so daß der Steuerdruckraum 52 vom Entlastungsraum 24 getrennt ist und sich im Steuerdruckraum 52 über dessen Verbindung 56 mit der Leitung 14 Hochdruck aufbaut. Hierdurch wird über den Kolben 50 auf das Einspritzventilglied 28 eine die Kraft der Schließfeder 44 unterstützende Kraft erzeugt, so daß das Einspritzventilglied 28 entgegen seiner Öffnungsrichtung 29 bewegt und mit seiner Dichtfläche 34 am Ventilsitz 36 zur Anlage kommt und die Voreinspritzung beendet wird.To end the pilot injection, the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the discharge space 24th is separated and in the control pressure chamber 52 via the Compound 56 with the line 14 builds high pressure. This is on the piston 50 on the Injector member 28, a force of the closing spring 44th generates supportive force so that the Injection valve member 28 against its opening direction 29th moved and with its sealing surface 34 on the valve seat 36 to Plant comes and the pre-injection is finished.

Für eine nachfolgende Haupteinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geöffnet, so daß der Steuerdruckraum 52 wieder entlastet ist und das Kraftstoffeinspritzventil 12 öffnet. Das erste Steuerventil 60 kann beim Beginn der Haupteinspritzung geöffnet sein, so daß die Verbindung 59 zum Entlastungsraum 24 geöffnet ist und sich in der Leitung 14 und dem Druckraum 40 des Kraftstoffeinspritzventils 12 der durch das Druckhalteventil 62 vorgegebene Druck aufbaut. Die Haupteinspritzung beginnt dann mit einem Druckniveau wie auch die Voreinspritzung erfolgt ist. Die Haupteinspritzung beginnt bei geschlossenem erstem Steuerventil 60 mit einem höheren Druckniveau als bei zunächst geöffnetem erstem Steuerventil 60. Anschließend wird das erste Steuerventil 60 durch die Steuereinrichtung 66 geschlossen, so daß die Verbindung 59 mit dem Entlastungsraum 24 getrennt ist und die Haupteinspritzung erfolgt weiter mit einem Druck, wie er entsprechend dem Profil des Nockens 20 im Pumpenarbeitsraum 22 erzeugt wird. Es kann auch vorgesehen sein, daß zunächst das erste Steuerventil 60 geschlossen wird, jedoch das zweite Steuerventil 68 noch geschlossen bleibt, so daß noch keine Einspritzung erfolgt. Das zweite Steuerventil 68 wird dann erst verzögert geöffnet, wodurch der Beginn der Haupteinspritzung verzögert wird und außerdem die Haupteinspritzung bei einem höheren Druck beginnt. Die Haupteinspritzung entspricht in Figur 2 einer mit II bezeichneten Einspritzphase, wobei der Druckverlauf mit durchgezogener Linie für den Fall dargestellt ist, daß das erste Steuerventil 60 zu Beginn geöffnet ist, und der Druckverlauf mit gestrichelter Linie für den Fall dargestellt ist, daß das erste Steuerventil 60 schon zu Beginn geschlossen ist.For a subsequent main injection, the second Control valve 68 opened by the controller 66, so that the control pressure chamber 52 is relieved again and the Fuel injection valve 12 opens. The first control valve 60 may be open at the beginning of the main injection, so the connection 59 to the relief space 24 is open and in the conduit 14 and the pressure chamber 40 of the Fuel injection valve 12 through the pressure-holding valve 62 established pressure. The main injection begins then with a pressure level as well as the pre-injection is done. The main injection starts when closed first control valve 60 with a higher pressure level than at initially opened first control valve 60. Subsequently becomes the first control valve 60 by the controller 66 closed, so that the connection 59 with the Relief space 24 is disconnected and the main injection continues with a pressure as he according to the Profile of the cam 20 in the pump working chamber 22 is generated. It can also be provided that initially the first Control valve 60 is closed, but the second Control valve 68 is still closed, so that no Injection takes place. The second control valve 68 then becomes delayed until it opens, causing the beginning of the Main injection is delayed and also the Main injection starts at a higher pressure. The Main injection corresponds in Figure 2 one with II designated injection phase, wherein the pressure curve with shown by the solid line in the event that the first control valve 60 is opened at the beginning, and the Pressure curve with dashed line in case is shown that the first control valve 60 is already closed Beginning is closed.

Zur Beendigung der Haupteinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geschlossen, so daß der Steuerdruckraum 52 vom Entlastungsraum 24 getrennt ist und sich im Steuerdruckraum 52 durch dessen Verbindung mit der Leitung 14 und damit dem Pumpenarbeitsraum 22 Hochdruck aufbaut, durch den das Kraftstoffeinspritzventil 12 geschlossen wird. Das erste Steuerventil 60 bleibt dabei geschlossen, so daß die Verbindung 59 zum Druckspeicher 62 getrennt ist. Für eine Nacheinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 nochmals geöffnet, so daß der Steuerdruckraum 52 wieder entlastet ist und das Kraftstoffeinspritzventil 12 öffnet. Die Nacheinspritzung erfolgt mit einem Druckverlauf entsprechend dem Profil des Nockens 20. Zur Beendigung der Nacheinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geschlossen und/oder das erste Steuerventil 60 durch die Steuereinrichtung 66 geöffnet. Die Nacheinspritzung entspricht einer in Figur 2 mit III bezeichneten Einspritzphase.To finish the main injection, the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the discharge space 24th is separated and in the control pressure chamber 52 by the Connection with the line 14 and thus the Pump work space 22 builds high pressure, through which the Fuel injection valve 12 is closed. The first Control valve 60 remains closed, so that the Connection 59 to the accumulator 62 is disconnected. For one Nacheinspritzung the second control valve 68 through the Control device 66 opened again, so that the Control pressure chamber 52 is relieved again and the Fuel injection valve 12 opens. The post-injection takes place with a pressure curve corresponding to the profile of Cam 20. To end the post-injection is the second control valve 68 by the control device 66 closed and / or the first control valve 60 through the Control device 66 opened. The post-injection corresponds to a designated in Figure 2 with III Injection phase.

Nach Beendigung der Nacheinspritzung bleibt das zweite Steuerventil 68 geschlossen. Eine weitere, in Figur 2 mit gestrichelten Linien dargestellte Nacheinspritzung kann durch den durch das Druckhalteventil 62 eingestellten Druck im Druckraum 40, dem Kanal 54 und der Leitung 14 erfolgen. In diesem Fall wirken der Druckraum 40, der Kanal 54 und die Leitung 14 als Speicherelemente, aus denen die Kraftstoffmenge für die weitere Nacheinspritzung entnommen wird. Für die weitere Nacheinspritzung ist das erste Steuerventil 60 geöffnet und das zweite Steuerventil 68 wird ebenfalls kurzzeitig geöffnet. Der Pumpenkolben 18 kann sich zum Zeitpunkt der weiteren Nacheinspritzung im Saughub befinden, wobei der Pumpenarbeitsraum 22 durch das geschlossene Rückschlagventil 25 von der Leitung 14 abgekoppelt ist.After completion of the post-injection remains the second Control valve 68 closed. Another, in Figure 2 with Dashed lines shown post-injection can by the pressure set by the pressure-holding valve 62 take place in the pressure chamber 40, the channel 54 and the line 14. In this case, the pressure chamber 40, the channel 54 and the act Line 14 as memory elements that make up the Fuel quantity taken for further post-injection becomes. For the further post-injection is the first Control valve 60 is opened and the second control valve 68 is also open for a short time. The pump piston 18 can at the time of further post-injection in the intake stroke located, the pump working space 22 through the closed check valve 25 from the line 14th disconnected.

In Figur 3 ist eine weitere Ausführung der Kraftstoffeinspritzeinrichtung dargestellt, bei der der grundsätzliche Aufbau im wesentlichen gleich wie bei der vorstehend erläuterten Ausführung ist, jedoch die Anordnung und Ausbildung des zweiten Steuerventils 168 modifiziert ist. Das zweite Steuerventil 168 ist elektrisch steuerbar und weist einen Aktor 169 auf, der ein Elektromagnet oder ein Piezoaktor sein kann, der elektrisch angesteuert wird und durch den ein Ventilglied des Steuerventils 168 bewegbar ist. Das zweite Steuerventil 168 ist in der Verbindung 56 des Steuerdruckraums 52 mit dem Kanal 54 angeordnet. Das zweite Steuerventil 168 ist als ein 3/2-Wegeventil ausgebildet, durch das in einer ersten Schaltstellung die Verbindung 56 des Steuerdruckraums 52 mit dem Kanal 54 und damit dem Pumpenarbeitsraum 22 geöffnet ist und der Steuerdruckraum 52 vom Entlastungsraum 24 getrennt ist. In einer zweiten Schaltstellung des zweiten Steuerventils 168 ist der Steuerdruckraum 52 mit dem Entlastungsraum 24 verbunden und die Verbindung 56 zum Kanal 54 und damit zum Pumpenarbeitsraum 22 ist getrennt. Zur Ermöglichung der Öffnung des Kraftstoffeinspritzventils 12 wird das zweite Steuerventil 168 durch die Steuereinrichtung 66 in seine zweite Schaltstellung gebracht, in der der Steuerdruckraum 52 in den Entlastungsraum 24 entlastet ist, und zum Schließen des Kraftstoffeinspritzventils 12 wird das zweite Steuerventil 168 in seine erste Schaltstellung gebracht, in der der Steuerdruckraum 52 mit dem Kanal 54 verbunden ist. FIG. 3 shows another embodiment of the invention Fuel injection device shown in which the basic structure essentially the same as in the the above-explained embodiment is, however, the arrangement and training the second control valve 168 modified is. The second control valve 168 is electrically controllable and has an actuator 169, which is an electromagnet or may be a piezoelectric actuator, which is electrically controlled and by a valve member of the control valve 168 movable is. The second control valve 168 is in the connection 56 the control pressure chamber 52 is arranged with the channel 54. The second control valve 168 is as a 3/2-way valve formed by the in a first switching position the Connection 56 of the control pressure chamber 52 with the channel 54 and so that the pump working chamber 22 is open and the Control pressure chamber 52 is separated from the discharge chamber 24. In a second switching position of the second control valve 168 is the control pressure chamber 52 with the discharge space 24th connected and the connection 56 to the channel 54 and thus to Pump workspace 22 is disconnected. To enable the Opening of the fuel injection valve 12 becomes the second Control valve 168 by the controller 66 in his second switching position brought in the control pressure chamber 52 is relieved in the discharge chamber 24, and to Closing the fuel injection valve 12 becomes the second Control valve 168 brought into its first switching position, in the control pressure chamber 52 is connected to the channel 54.

Ansonsten ist die Funktionsweise der Kraftstoffeinspritzeinrichtung gemäß dieser modifizierten Ausführung gleich wie bei der gemäß Figur 1.Otherwise, the functioning of the Fuel injection device according to this modified Same execution as in the according to FIG. 1

In Figur 4 ist eine weitere Ausführung der Kraftstoffeinspritzeinrichtung dargestellt, bei der der grundsätzliche Aufbau im wesentlichen gleich wie bei der Ausführung gemäß Figur 1 ist, jedoch die Anordnung und Ausbildung des zweiten Steuerventils 268 modifiziert ist. Das zweite Steuerventil 268 ist elektrisch steuerbar und weist einen Aktor 269 auf, der ein Elektromagnet oder ein Piezoaktor sein kann, der elektrisch angesteuert wird und durch den ein Ventilglied des Steuerventils 268 bewegbar ist. An das zweite Steuerventil 268 ist einerseits die Leitung 14 angeschlossen und andererseits ist an dieses der Kanal 54 zum Druckraum 40 und die Verbindung 56 zum Steuerdruckraum 52 angeschlossen. Das zweite Steuerventil 268 ist als ein 3/2-Wegeventil ausgebildet, durch das in einer ersten Schaltstellung die Verbindung 56 des Steuerdruckraums 52 mit dem Kanal 54 geöffnet ist und der Kanal 54 von der Leitung 14 und somit vom Pumpenarbeitsraum 22 getrennt ist. In einer zweiten Schaltstellung des zweiten Steuerventils 268 ist durch dieses der Steuerdruckraum 52 vom Kanal 54 getrennt und der Kanal 54 ist mit der Leitung 14 und somit dem Pumpenarbeitsraum 22 verbunden. Der Steuerdruckraum 52 weist eine Verbindung 270 mit dem Entlastungsraum 24 auf, in der ein zum Entlastungsraum 24 öffnendes Rückschlagventil 272 angeordnet ist und außerdem eine Drosselstelle vorgesehen sein kann. Zur Ermöglichung der Öffnung des Kraftstoffeinspritzventils 12 wird das zweite Steuerventil 268 durch die Steuereinrichtung 66 in seine zweite Schaltstellung gebracht, in der der Steuerdruckraum 52 vom Kanal 54 getrennt ist und der Kanal 54 mit der Leitung 14 verbunden ist, so daß der von der Kraftstoffpumpe 10 erzeugte Druck in den Druckraum 40 des Kraftstoffeinspritzventils 12 gelangt, wobei der Steuerdruckraum 52 in den Entlastungsraum 24 entlastet ist. Zum Schließen des Kraftstoffeinspritzventils 12 wird das zweite Steuerventil 268 in seine erste Schaltstellung gebracht, in der der Steuerdruckraum 52 mit dem Kanal 54 verbunden ist, der Kanal 54 jedoch von der Leitung 14 getrennt ist. Der im Druckraum 40 des Kraftstoffeinspritzventils 12 herrschende Druck wirkt dabei auch im Steuerdruckraum 52, wodurch das Kraftstoffeinspritzventil 12 geschlossen wird. Ansonsten ist die Funktionsweise der Kraftstoffeinspritzeinrichtung gemäß dieser modifizierten Ausführung gleich wie bei der gemäß Figur 1.In Figure 4 is a further embodiment of Fuel injection device shown in which the basic structure essentially the same as in the Embodiment of Figure 1 is, however, the arrangement and Training the second control valve 268 is modified. The second control valve 268 is electrically controllable and has an actuator 269, which is an electromagnet or a Piezoelectric actuator can be, which is electrically controlled and by a valve member of the control valve 268 movable is. On the second control valve 268 on the one hand the Line 14 connected and on the other hand is to this the Channel 54 to the pressure chamber 40 and the connection 56 to Control pressure chamber 52 connected. The second control valve 268 is formed as a 3/2-way valve, through which in a first switching position, the connection 56 of the Control pressure chamber 52 is open with the channel 54 and the Channel 54 from the line 14 and thus from the pump working space 22 is disconnected. In a second switching position of the second Control valve 268 is through this the control pressure chamber 52nd separated from the channel 54 and the channel 54 is with the line 14 and thus connected to the pump working space 22. Of the Control pressure chamber 52 has a connection 270 with the Relief 24 on, in the one to the relief space 24th opening check valve 272 is arranged and also a throttle point may be provided. To enable the opening of the fuel injection valve 12 is the second control valve 268 by the controller 66 in brought his second switch position in which the Control pressure chamber 52 is separated from the channel 54 and the channel 54 is connected to the line 14 so that the of the Fuel pump 10 generated pressure in the pressure chamber 40 of the Fuel injection valve 12 passes, the Control pressure chamber 52 is relieved in the discharge chamber 24. To close the fuel injection valve 12 is the second control valve 268 in its first switching position brought in the control pressure chamber 52 with the channel 54th However, the channel 54 is connected from the line 14th is disconnected. The in the pressure room 40 of the Fuel injection valve 12 prevailing pressure acts also in the control pressure chamber 52, causing the Fuel injection valve 12 is closed. Otherwise is the operation of the fuel injection device according to this modified version same as in accordance with FIG. 1

Claims (4)

  1. Fuel injection device for internal combustion engines, having a fuel pump (10) for every cylinder of the internal combustion engine, which fuel pump (10) has a pump piston (18) which is driven in a reciprocal movement by the internal combustion engine and delimits a pump working chamber (22) to which fuel is fed from a fuel reservoir container (9) and which is connected to a fuel injection valve (12) which has an injection valve element (28) by which at least one injection opening (32) is controlled and which can be moved in an opening direction (29) counter to a closing force by the pressure which prevails in a pressure space (40) which is connected to the pump working chamber (22), having a first electrically controlled control valve (60) by which one connection (59) of the pump working chamber (22) to a relief space (24) is controlled, a pressure-holding valve (62) which opens towards the first control valve (60) being arranged between the pump working chamber (22) and the first control valve (60), by means of which pressure-holding valve (62) a pressure is maintained which is higher than the pressure which prevails in the relief space (24), characterized in that a second electrically controlled control valve (68; 168; 268) is provided by which the pressure which prevails in a control pressure space (52) of the fuel injection valve (12) is controlled, by means of which pressure the injection valve element (28) is acted on at least indirectly in the closing direction, in that a non-return valve (25) which opens towards the pressure-holding valve (62) is arranged between the pump working chamber (22) and the pressure-holding valve (62), by means of which non-return valve (25) the pump working chamber (22) can be decoupled from the pressure space (40) and from the pressure-holding valve (62), and in that the pump working chamber (22) has a connection (13) to the fuel reservoir container (9) or an accumulator region (24), which connection (13) opens between the said pump working chamber (22) and the non-return valve (25).
  2. Fuel injection device according to Claim 1, characterized in that the second control valve (168) is configured as a 3/2-way valve by which the control pressure space (52) is connected to the pump working chamber (22) and separated from a relief space (24) in a first switching position, and by which the control pressure space (52) is connected to the relief space (24) and separated from the pump working chamber (22) in a second switching position.
  3. Fuel injection device according to Claim 1, characterized in that the second control valve (268) is configured as a 3/2-way valve by which the control pressure space (52) is separated from a pressure space (40) of the fuel injection valve (12) and the pressure space (40) is connected to the pump working chamber (22) in a first switching position, and by which the control pressure space (52) is connected to the pressure space (40) and the pressure space (40) is separated from the pump working chamber (22) in a second switching position.
  4. Fuel injection device according to Claim 3, characterized in that the control pressure space (52) has a connection (270) to a relief space (24), in which connection (270) a non-return valve (272) which opens towards the relief space (24) is preferably arranged.
EP02008632A 2001-05-17 2002-04-17 A fuel injection system for an internal combustion engine Expired - Lifetime EP1260702B1 (en)

Applications Claiming Priority (2)

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DE10123993A DE10123993A1 (en) 2001-05-17 2001-05-17 Fuel injection device has pressure maintaining valve between working cavity of pump and first control valve
DE10123993 2001-05-17

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EP1260702A3 EP1260702A3 (en) 2004-03-17
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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10205750A1 (en) * 2002-02-12 2003-08-21 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
DE10221384A1 (en) * 2002-05-14 2003-11-27 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
US20060196974A1 (en) * 2005-03-01 2006-09-07 Caterpillar Inc. Fuel injector having a gradually restricted drain passageway
DE502006008648D1 (en) * 2005-10-25 2011-02-17 Crt Common Rail Technologies Ag Injector for a fuel injection system and fuel injection system with such an injector
US20170093005A1 (en) * 2015-09-24 2017-03-30 Qualcomm Incorporated High-density stacked grounded coplanar waveguides
JP6962039B2 (en) * 2017-07-12 2021-11-05 株式会社デンソー Fuel injection device

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937918A1 (en) * 1989-11-15 1991-05-16 Man Nutzfahrzeuge Ag INJECTION DEVICE FOR SELF-IGNITIONING INTERNAL COMBUSTION ENGINE
DE4118236C2 (en) * 1990-06-06 2000-02-17 Avl Verbrennungskraft Messtech Injection system for internal combustion engines
JPH06257529A (en) * 1993-02-18 1994-09-13 Robert Bosch Gmbh Fuel injector for internal combustion engine
DE4407166C1 (en) * 1994-03-04 1995-03-16 Daimler Benz Ag Fuel injection system for an internal combustion engine
JP3842331B2 (en) * 1995-05-26 2006-11-08 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング FUEL SUPPLY DEVICE FOR FUEL SUPPLY FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR OPERATING INTERNAL COMBUSTION ENGINE
JP3939779B2 (en) * 1995-05-26 2007-07-04 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Fuel supply device for fuel supply of an internal combustion engine
IT239878Y1 (en) * 1996-12-23 2001-03-13 Elasis Sistema Ricerca Fiat IMPROVEMENTS TO AN ELECTROMAGNETIC CONTROL DOSING VALVE FOR A FUEL INJECTOR.
DE19752834A1 (en) * 1997-11-28 1999-06-02 Bosch Gmbh Robert Fuel injection device for internal combustion engines
GB9810327D0 (en) 1998-05-15 1998-07-15 Lucas Ind Plc Fuel system and pump suitable for use therein
DE19822671A1 (en) * 1998-05-20 1999-11-25 Bosch Gmbh Robert Pressure limiting valve for internal combustion engine
DE19939421A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Combined stroke / pressure controlled fuel injection method and system for an internal combustion engine
US6484699B2 (en) * 2000-03-06 2002-11-26 Marius A. Paul Universal fuel injection system
DE10123994A1 (en) * 2001-05-17 2002-11-21 Bosch Gmbh Robert Fuel injection device for internal combustion engine has two control valves controlled by common actuator that controls pressure in actuator pressure chamber applied to both control valves

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US6637670B2 (en) 2003-10-28
DE50204742D1 (en) 2005-12-08
EP1260702A3 (en) 2004-03-17
DE10123993A1 (en) 2002-11-21
US20030006296A1 (en) 2003-01-09
EP1260702A2 (en) 2002-11-27

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