EP1260700A1 - Systeme d'injection de carburant pour moteur a combustion interne - Google Patents

Systeme d'injection de carburant pour moteur a combustion interne Download PDF

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Publication number
EP1260700A1
EP1260700A1 EP02008447A EP02008447A EP1260700A1 EP 1260700 A1 EP1260700 A1 EP 1260700A1 EP 02008447 A EP02008447 A EP 02008447A EP 02008447 A EP02008447 A EP 02008447A EP 1260700 A1 EP1260700 A1 EP 1260700A1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
chamber
control valve
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02008447A
Other languages
German (de)
English (en)
Other versions
EP1260700B1 (fr
Inventor
Nestor Rodriguez-Amaya
Roger Potschin
Juergen Gruen
Ulrich Projahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1260700A1 publication Critical patent/EP1260700A1/fr
Application granted granted Critical
Publication of EP1260700B1 publication Critical patent/EP1260700B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0061—Single actuator acting on two or more valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • 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
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention is based on one Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injector is due to the EP 0 957 261 A1 is known.
  • This Fuel injector has a fuel pump for each cylinder of the internal combustion engine, the one by the internal combustion engine in one stroke driven pump piston, which has a Pump workspace limits the fuel from one Fuel tank is supplied.
  • the Pump work space is with a fuel injector connected, which has an injection valve member through which at least one injection opening is controlled and that through the one connected to the pump work room Pressure prevailing pressure against a closing force in Opening direction is movable. It's a first electric controlled control valve provided by one Connection of the pump workspace with the Fuel tank controlled as a relief space becomes.
  • the fuel injection device with the Features according to claim 1 has the advantage that through the third control valve and the pressure relief valve a pre-injection and a start of a main injection is enabled with a reduced pressure level, whereby the emission of pollutants and the sound of Internal combustion engine can be reduced.
  • 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 course of a pressure Injection openings of a fuel injector
  • Figure 3 in sections a modified version of the Fuel injector.
  • FIG. 1 and 3 is one Fuel injection device for an internal combustion engine shown a motor vehicle.
  • the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the Fuel injector is preferably as so-called pump-line-nozzle system designed and has one for each cylinder of the internal combustion engine Fuel pump 10, a fuel injection valve 12 and a the fuel injector 12 with the Fuel pump 10 connecting line 14.
  • the Fuel pump 10 has a seal in a cylinder 16 guided pump piston 18, which by a cam 20th a camshaft of the internal combustion engine against the force a return spring 19 driven in one stroke becomes.
  • the pump piston 18 delimits one in the cylinder 16 Pump working space 22 in which the delivery stroke of Pump piston 18 fuel is compressed under high pressure.
  • the pump work space 22 is by means of a feed pump 21 Fuel from a fuel tank 24 of the Motor vehicle supplied. Between the feed pump 21 and the pump work space 22 is a to the pump work space 22 opening check valve 23 arranged. On line 14 may be another opening from the pump work space 22 Check valve 25 may be arranged. The conveyor line 13 from the feed pump 21 opens between the pump work space 22 and the further check valve 25.
  • the fuel injector 12 is separate from the Fuel pump 10 arranged and via line 14 with connected to the pump work space 22.
  • the Fuel injection valve 12 has a valve body 26 on, which can be formed in several parts, in which a Injection valve member 28 in a bore 30 is guided longitudinally.
  • the valve body 26 instructs its the combustion chamber of the cylinder of the internal combustion engine facing end region at least one, preferably several Injection openings 32 on.
  • the injection valve member 28 has at its end area facing the combustion chamber for example, approximately conical sealing surface 34, which with one in the valve body 26 in its facing the combustion chamber End region trained valve seat 36 cooperates from after or after which the injection openings 32 discharge.
  • valve body 26 is between the injection valve member 28 and an annular space 38 toward the bore 30 toward the valve seat 36 present, the one facing away from the valve seat 36 End area through a radial expansion of the bore 30 in a pressure chamber 40 surrounding the injection valve member 28 transforms.
  • the injection valve member 28 has the level of Pressure chamber 40 by reducing a cross section Pressure shoulder 42 on.
  • Injector member 28 engages a biased one Closing spring 44 through which the injection valve member 28 is pressed towards the valve seat 36.
  • the closing spring 44 is arranged in a spring chamber 46 of the valve body 26, the connects to the bore 30.
  • the Fuel injector has a close to that First control valve 60 arranged on fuel pump 10, that can be integrated into the fuel pump 10, for example can.
  • a connection is established by the first control valve 60 59 of the pump workspace 22 of the fuel pump 10 a relief room controlled than the at least indirectly the fuel tank 24 can serve.
  • the connection 59 branches downstream of the check valve 25 from the Line 14 from.
  • the first control valve 60 may or may not be pressure balanced be pressure-balanced.
  • the first control valve 60 is designed as a 2/2-way valve and through it in a first switching position, the connection 59 to Relief chamber 24 opened and in a second Switch position becomes the connection 59 to the relief chamber 24 Cut.
  • a second control valve 68 provided by the one Connection 70 of the control pressure chamber 52 with a Relief room, for example the Fuel reservoir 24 is controlled.
  • the second Control valve 68 is electrically controllable and has one Actuator 69, which can be an electromagnet or a piezo actuator can be controlled electrically by a control device 66 is controlled and through which a valve member of the Control valve 68 is movable.
  • the second control valve 68 is preferably designed to be pressure-balanced.
  • the second Control valve 68 is designed as a 2/2-way valve, through the connection 70 in a first switching position of the control pressure chamber 52 with the fuel reservoir 24 is separated and by that in a second switching position the connection 70 of the control pressure chamber 52 with the Fuel reservoir 24 is open.
  • connection 59 of the control pressure chamber 52 with the line 14 is one Throttle point 58 is provided and in the connection 70 of the Control pressure chamber 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 operated by the control device 66 controlled. The control of the control valves 60,68 the control device 66 takes place depending on Operating parameters of the internal combustion engine, such as for example speed, load and temperature.
  • a third control valve 74 is also provided, through which another connection 75 of the pump work space 22 is controlled with a relief space than that in turn, the fuel tank 24 can serve.
  • connection 75 is to the fuel tank 24 arranged opening pressure relief valve 76.
  • the Pressure relief valve 76 has, for example a closing spring 77 loaded valve member 78, the against the force of the closing spring 77 for Fuel reservoir 24 in the opening direction is movable.
  • the pressure relief valve 76 is preferred as shown in Figure 1 upstream before the third Control valve 74 arranged, the third control valve 74 does not need to be pressure balanced.
  • the Pressure relief valve 76 can, however, also as in FIG.
  • the third control valve 74 is preferably designed to be pressure-balanced.
  • the third Control valve 74 is designed as a 2/2-way valve and through this in a first switching position Connection 75 to the relief chamber 24 opened and in one second switching position, the connection 75 to Relief chamber 24 separated.
  • the first control valve 60 and the third control valve 74 are preferably through a common through the Control device 66 electrically controlled actuator 80 controlled.
  • the first control valve 60 and the third Control valve 74 can be arranged on fuel pump 10 his.
  • the control valves 60, 74 can for example be arranged side by side.
  • the actuator 80 is the pressure prevailing in an actuator pressure chamber 82, the actuator pressure chamber 82 with a hydraulic fluid, in particular fuel is filled.
  • the actuator 80 is preferably designed as a piezo actuator which depends on the amount of an electrical voltage applied to it its length changes.
  • the two control valves 60, 74 have each have a control valve member 62,86, the pressure in the Actuator pressure chamber 82 is acted upon and against the force of one Return spring 63.87 is movable.
  • the preload of the Return spring 87 of the third control valve 74 is larger than the bias of the return spring 63 of the first Control valve 60.
  • the first control valve 60 and the third Control valve 74 is in actuator pressure chamber 82 at low pressure opened so that both connections 59 and 75 of the Pump work room 22 opened with the relief chamber 24 are.
  • the pressure in the actuator pressure chamber 82 passes through corresponding control of the actuator 80 by the Control device 66 is increased to a first pressure level, the first control valve 60 switches because of the smaller one Bias from its return spring 63 in its closed position so that the connection 59 of the Pump work space 22 separated from the relief space 24 is.
  • the third control valve 74 remains with this Pressure level however due to the higher preload of it Return spring 87 still in its open position so that the pump working space 22 when the Pressure relief valve 76 set pressure over the opened connection 75 connected to the relief chamber 24 is. Only when the pressure in the actuator pressure chamber 82 passes through corresponding control of the actuator 80 by the Control device 66 continues to a second pressure level is increased, the third control valve 74 switches into its closed position so that the pump working space 22nd is completely separated from the relief chamber 24.
  • the first Control valve 60 remains in when the pressure increases Actuator pressure chamber 82 in its closed position.
  • the pressure relief valve 76 opens and fuel flows through the opened third Control valve 74 and the connection 75 in the relief chamber 24. The following remains in line 14 and the Pressure chamber 40 prevailing pressure at least approximately constant.
  • the opening pressure of the pressure relief valve 76 is determined by determines the bias of its closing spring 77.
  • the Pre-injection takes place with a through the Pressure relief valve 76 limited pressure.
  • the second Control valve 68 is activated by a corresponding control of the actuator 69 opened so that the control pressure chamber 52 with the relief chamber 24 is connected.
  • the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the fuel tank 24 is separated and located in the control pressure chamber 52 above it Connection 56 with line 14 builds up an increased pressure.
  • the piston 50 on the Injection valve member 28 a the force of the closing spring 44th generating supportive power, so that Injection valve member 28 against its opening direction 29 moves and with its sealing surface 34 on the valve seat 36.
  • the termination of the Pre-injection also opened the first control valve 60 be, so that in the pump work room 22, the line 14 and the pressure chamber 40 can no longer build up high pressure and the fuel injector 12 by the force of the Closing spring 44 closes.
  • the second one Control valve 68 opened by the control device 66, see above that the control pressure chamber 52 is relieved and that Fuel injection valve 12 opens.
  • the first control valve 60 is closed by the control device 66, so that the connection 59 of the pump workspace 22 with the Relief chamber 24 is separated.
  • the third control valve 74 remains open at the beginning of the main injection, so that the connection 75 to the relief chamber 24 is open and itself in the line 14 and the pressure chamber 40 of the Fuel injector 12 which by the Pressure relief valve 76 builds up predetermined pressure.
  • the Main injection then begins with a pressure level like the pre-injection has also taken place.
  • the main injection begins with a closed third control valve 74 higher pressure level than when the third one is open Control valve 74.
  • the third control valve 74 closed by the control device 66 so that the Connection 75 is separated with the relief chamber 24 and the main injection continues with a pressure like that according to the profile of the cam 20 in the pump work space 22 is generated. It can also be provided that initially the third control valve 74 is closed, but that second control valve 68 remains closed, so that still no injection takes place. The second control valve 68 is only then opened with a delay, causing the beginning of Main injection is delayed and also the Main injection starts at a higher pressure. The The main injection in FIG.
  • the second one Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the fuel tank 24 is separated and located in the control pressure chamber 52 Connection with line 14 and thus the Pump work space 22 builds high pressure, through which Fuel injection valve 12 is closed.
  • the first Control valve 60 and third control valve 74 remain closed, so that the connections 59 and 75 to Relief chamber 24 are separated.
  • the second control valve 68 by the control device 66 opened again, so that the control pressure chamber 52 again is relieved and the fuel injection valve 12 opens.
  • the post-injection takes place with a pressure curve according to the profile of the cam 20.
  • the second control valve 68 through the Control device 66 closed and / or the first Control valve 60 opened by the control device 66.
  • the Post-injection corresponds to one in Figure 2 with III designated injection phase.

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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)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02008447A 2001-05-17 2002-04-13 Système d'injection de carburant pour moteur à combustion interne Expired - Lifetime EP1260700B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10123995A DE10123995A1 (de) 2001-05-17 2001-05-17 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10123995 2001-05-17

Publications (2)

Publication Number Publication Date
EP1260700A1 true EP1260700A1 (fr) 2002-11-27
EP1260700B1 EP1260700B1 (fr) 2005-02-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02008447A Expired - Lifetime EP1260700B1 (fr) 2001-05-17 2002-04-13 Système d'injection de carburant pour moteur à combustion interne

Country Status (3)

Country Link
US (1) US6540160B2 (fr)
EP (1) EP1260700B1 (fr)
DE (2) DE10123995A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003069154A1 (fr) * 2002-02-12 2003-08-21 Robert Bosch Gmbh Systeme d'injection de carburant pour un moteur a combustion interne
EP1316718A3 (fr) * 2001-11-30 2004-04-28 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur à combustion interne
WO2004072470A1 (fr) * 2003-02-12 2004-08-26 Robert Bosch Gmbh Systeme de pompe d'injection de carburant comportant un mecanisme de post-injection haute pression

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014451A1 (de) * 2000-03-23 2001-09-27 Bosch Gmbh Robert Verfahren und Vorrichtung zur Formung des Einspritzdruckverlaufs an Injektoren
EP1359316B1 (fr) * 2002-05-03 2007-04-18 Delphi Technologies, Inc. Système d'injection de carburant
US7146973B2 (en) * 2003-09-09 2006-12-12 James Pneumatics, Llc Launching device
US20060196974A1 (en) * 2005-03-01 2006-09-07 Caterpillar Inc. Fuel injector having a gradually restricted drain passageway
US7762478B1 (en) * 2006-01-13 2010-07-27 Continental Automotive Systems Us, Inc. High speed gasoline unit fuel injector
DE102016015037B3 (de) * 2016-12-16 2018-05-30 L'orange Gmbh Kraftstoffinjektoranordnung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957261A2 (fr) * 1998-05-15 1999-11-17 LUCAS INDUSTRIES public limited company Système de carburant et pompe utilisable dans ce système
EP1002948A2 (fr) * 1998-11-19 2000-05-24 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Système d'injection de combustible du type à accumulation
DE19939421A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823827A1 (de) * 1988-07-14 1990-01-18 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen, insbesondere pumpeduese
DE19504849A1 (de) * 1995-02-15 1996-08-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957261A2 (fr) * 1998-05-15 1999-11-17 LUCAS INDUSTRIES public limited company Système de carburant et pompe utilisable dans ce système
EP1002948A2 (fr) * 1998-11-19 2000-05-24 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Système d'injection de combustible du type à accumulation
DE19939421A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1316718A3 (fr) * 2001-11-30 2004-04-28 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur à combustion interne
WO2003069154A1 (fr) * 2002-02-12 2003-08-21 Robert Bosch Gmbh Systeme d'injection de carburant pour un moteur a combustion interne
US7025284B2 (en) 2002-02-12 2006-04-11 Robert Bosch Gmbh Fuel injection system for an internal combustion engine
WO2004072470A1 (fr) * 2003-02-12 2004-08-26 Robert Bosch Gmbh Systeme de pompe d'injection de carburant comportant un mecanisme de post-injection haute pression
US7281523B2 (en) 2003-02-12 2007-10-16 Robert Bosch Gmbh Fuel injector pump system with high pressure post injection

Also Published As

Publication number Publication date
DE10123995A1 (de) 2002-11-21
EP1260700B1 (fr) 2005-02-02
US20030010846A1 (en) 2003-01-16
DE50202158D1 (de) 2005-03-10
US6540160B2 (en) 2003-04-01

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