EP1310668A2 - Système d'injection de carburant pour un moteur à combustion - Google Patents

Système d'injection de carburant pour un moteur à combustion Download PDF

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Publication number
EP1310668A2
EP1310668A2 EP02022362A EP02022362A EP1310668A2 EP 1310668 A2 EP1310668 A2 EP 1310668A2 EP 02022362 A EP02022362 A EP 02022362A EP 02022362 A EP02022362 A EP 02022362A EP 1310668 A2 EP1310668 A2 EP 1310668A2
Authority
EP
European Patent Office
Prior art keywords
control
chamber
fuel
injection valve
pressure
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
EP02022362A
Other languages
German (de)
English (en)
Other versions
EP1310668B1 (fr
EP1310668A3 (fr
Inventor
Peter Boehland
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 EP1310668A2 publication Critical patent/EP1310668A2/fr
Publication of EP1310668A3 publication Critical patent/EP1310668A3/fr
Application granted granted Critical
Publication of EP1310668B1 publication Critical patent/EP1310668B1/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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • 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
    • F02M45/04—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 with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable 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
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • 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 is based on one Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • This Fuel injector has one High-pressure fuel pump and a connected to it Fuel injector for each cylinder of the Internal combustion engine on.
  • the high-pressure fuel pump has one by the internal combustion engine in one stroke driven pump piston on which a pump work space limited.
  • the fuel injector has one with the Pump work room connected pressure room and a Injection valve member through which at least one Injection opening is controlled by the in Pressure prevailing pressure against a closing force in Opening direction to release the at least one Injection opening is movable. It's a first electric actuated control valve provided by one Connection of the pump work room with a relief room is controlled.
  • the injection valve member is by the im Control pressure chamber prevailing pressure at least indirectly a closing direction and the control pressure chamber is connected to the pump work room.
  • To a Fuel injection becomes the first control valve closed and the second control valve opened so that no high pressure can build up in the control pressure chamber and that Can open fuel injector.
  • open second control valve flows out of the pump work space fuel from the control pressure chamber, so that for the Injection available amount of fuel amount of fuel delivered by the pump piston is reduced and also that for injection Available pressure is reduced. It follows that the efficiency of the fuel injector is not is optimal.
  • the fuel injection device with the Features according to claim 1 has the advantage that the second control valve for fuel injection can be closed so that no fuel and Fuel pressure loss occurs during injection and thus the efficiency of the fuel injector is improved.
  • the throttle point results in opened second control valve due to the outflow of Fuel in the relief chamber is a loss of pressure in one the subspaces of the control pressure chamber, so that on the Control piston and via this to the injection valve member a greater force acts in the closing direction than in closed second control valve when in both Partial spaces are at least approximately the same pressure.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation, Figure 2 one with II designated section of the fuel injector in an enlarged view and Figure 3 3 a course a pressure at injection orifices Fuel injector the Fuel injector.
  • FIG. 1 and 2 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-nozzle unit designed and has for each cylinder of the internal combustion engine one High-pressure fuel pump 10 and a connected thereto Fuel injector 12 on which is a common Form unit.
  • the Fuel injection device also as a so-called pump-line-nozzle system be trained in which the High pressure fuel pump and the fuel injection valve each cylinder arranged separately and over a line are connected.
  • the High-pressure fuel pump 10 has a pump body 14 a cylinder bore 16 in which a pump piston 18 is tightly led, at least indirectly by one Cam 20 counter to a camshaft of the internal combustion engine the force of a return spring 19 in one stroke is driven.
  • the pump piston 18 is limited in the Cylinder bore 16 a pump working space 22, in which Delivery stroke of the pump piston 18 fuel under high pressure is compressed.
  • the pump work space 22 becomes fuel from a fuel tank 24 of the motor vehicle fed.
  • the fuel injection valve 12 has one with the Pump body 14 connected valve body 26, the can be formed in several parts, and in the one 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 in the Valve body 26 is between the injection valve member 28 and an annular space 38 toward the bore 30 toward the valve seat 36 available, 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 spring chamber 46 is connected at its end facing away from the bore 30 in the valve body 26 another bore 48 in which a control piston 50 is sealed is guided, which is connected to the injection valve member 28 is.
  • the bore 48 forms a control pressure chamber 52 which by the control piston 50 in two by the control piston 50 sub-spaces 54, 56 are separated from one another.
  • the control piston 50 limits with that Injection valve member 28 facing a first Subspace 54 and with the injection valve member 28 facing end face a second subspace 56 in Control pressure chamber 52.
  • the control piston 50 is via a compared to this piston rod 51, which is smaller in diameter connected to the injection valve member 28.
  • the one in the first Subspace 54 is arranged end face of the control piston 50 because of the piston rod 51 slightly smaller than that in the second End space of control piston 50 arranged in partial space 56.
  • the control pressure chamber 52 is opposite the spring chamber 46 sealed.
  • the two sub-rooms 54, 56 are over one Throttle point 55 connected to each other, preferably in Is arranged in the form of a bore in the control piston 50, alternatively, however, in an outside of the Control pressure chamber 52 extending bypass can.
  • the control valve 68 can be used as a 2/2-way valve or as shown in Figure 1 be designed as a 2/3 way valve.
  • the control valve can be used as a 2/3-way valve 68 can be switched between three switch positions, whereby In a first switch position, the connection 66 completely is open, the connection in a second switch position 66 is opened via a throttle point 67 and in one third switching position, the connection 66 is completely separated.
  • the connection 64 of the control pressure chamber 52 with the Relief chamber 24 becomes electrical by a second one actuated control valve 70 controlled as a 2/2-way valve can be trained.
  • the control valves 68, 70 can one have an electromagnetic actuator or a piezo actuator and are controlled by an electronic control device 72 driven.
  • FIG. 3 is the Course of the pressure p at the injection openings 32 of the Fuel injector 12 over time t during one Injection cycle shown.
  • the delivery stroke of the pump piston 18 begins the fuel injection with a pre-injection, wherein the first control valve 68 by the controller 72 in its second switching position or in its third Switch position is brought so that the pump work space 22 via the throttle point 67 with the relief chamber 24 is connected and located in the pump work room 22 at the second switching position not the full high pressure build up according to the stroke movement of the pump piston 18 can or at the third switching position the full high pressure can build up.
  • the control device 72 also the second control valve 70 is closed.
  • the second control valve 70 When the second control valve 70 is open, it flows out the pump workspace 22 fuel through the Control pressure chamber 52 to the relief chamber 24.
  • the fuel flows through the throttle point 55 through the Pressure drop is caused so that in the first subspace 54 of the Control pressure chamber 52 is a lower pressure than in second subspace 56.
  • acts on the control piston 50 a larger resulting pressure force in the closing direction of the Injection valve member 28 than when the control valve is closed 70.
  • the sum of those acting on the spool 50 resulting compressive force and the force of the closing spring 44 is larger than that prevailing in the pressure chamber 40 Pressure exerted on the injection valve member 28, so that the fuel injection valve 12 closes.
  • the one in Figure 3 corresponds to the injection phase designated II, that is second control valve 70 by the control device 72 closed.
  • the first Control valve 68 by the control device 70 initially in its second open position is brought so that the Connection 66 of the pump work space 22 to the relief space 24 is opened via the throttle point 67.
  • the main injection then begins with a reduced Pressure level like this in Figure 3 with a solid line is shown.
  • the first Control valve 68 through the control device 72 in its brought third, completely closed switching position, so that the pump working space 22 is separated from the relief space 24 and the fuel injection takes place at high pressure.
  • Control device 72 already closes the first control valve 68 Start of the main injection into its third, whole closed switching position is brought so that the High pressure fuel injection is done as shown in Figure 3 is shown with a dashed line.
  • the second control valve 68 by the control device 72 can be closed at the beginning of the main injection. In this case there is a pressure curve as in Figure 3 is shown with a dash-dotted line.
  • the first Control valve 68 remains in its third switching position.
  • the Post-injection corresponds to one in Figure 3 with III designated injection phase and takes place at high pressure.
  • the post-injection is terminated by the Control device 72 the first control valve 68 in its brought the first, fully open switch position and the second Control valve 70 is in its open switch position brought.

Landscapes

  • 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)
EP02022362A 2001-11-10 2002-10-08 Système d'injection de carburant pour un moteur à combustion Expired - Lifetime EP1310668B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10155406 2001-11-10
DE10155406A DE10155406A1 (de) 2001-11-10 2001-11-10 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Publications (3)

Publication Number Publication Date
EP1310668A2 true EP1310668A2 (fr) 2003-05-14
EP1310668A3 EP1310668A3 (fr) 2004-12-15
EP1310668B1 EP1310668B1 (fr) 2006-09-20

Family

ID=7705404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02022362A Expired - Lifetime EP1310668B1 (fr) 2001-11-10 2002-10-08 Système d'injection de carburant pour un moteur à combustion

Country Status (3)

Country Link
US (1) US6779741B2 (fr)
EP (1) EP1310668B1 (fr)
DE (2) DE10155406A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10100795B2 (en) 2013-05-29 2018-10-16 Robert Bosch Gmbh High pressure pump for a fuel injection system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10160263A1 (de) * 2001-12-07 2003-06-18 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10160258A1 (de) * 2001-12-07 2003-06-18 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
US7191762B2 (en) * 2002-03-26 2007-03-20 Volvo Lastvagnar Ab Fuel injection system
DE10358010B3 (de) * 2003-12-11 2005-06-23 Volkswagen Mechatronic Gmbh & Co. Kg Pumpe-Düse-Vorrichtung
DE102004024926A1 (de) * 2004-05-19 2005-12-15 Volkswagen Mechatronic Gmbh & Co. Kg Pumpe-Düse-Einheit
US6976474B1 (en) * 2004-07-19 2005-12-20 Caterpillar Inc. Mechanically actuated, electronically controlled fuel injection system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0987431A2 (fr) 1998-09-18 2000-03-22 Lucas Industries Limited Injecteur de carburant

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3469793A (en) * 1967-05-11 1969-09-30 Int Harvester Co Fuel injection system
US4200231A (en) * 1978-06-19 1980-04-29 General Motors Corporation Fuel injector nozzle
EP0264640B1 (fr) * 1986-09-25 1993-12-08 Ganser-Hydromag Système d'injection de combustible à réglage électronique
GB9720003D0 (en) * 1997-09-20 1997-11-19 Lucas Ind Plc Drive circuit
DE19826719A1 (de) * 1998-06-16 1999-12-23 Bosch Gmbh Robert Ventilsteuereinheit für ein Kraftstoffeinspritzventil
GB9920352D0 (en) * 1999-08-28 1999-11-03 Lucas Ind Plc Fuel injector
GB9923823D0 (en) * 1999-10-09 1999-12-08 Lucas Industries Ltd Fuel injector
DE19951964A1 (de) * 1999-10-28 2001-05-03 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19952512A1 (de) * 1999-10-30 2001-05-10 Bosch Gmbh Robert Druckverstärker und Kraftstoffeinspritzsystem mit einem Druckverstärker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0987431A2 (fr) 1998-09-18 2000-03-22 Lucas Industries Limited Injecteur de carburant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10100795B2 (en) 2013-05-29 2018-10-16 Robert Bosch Gmbh High pressure pump for a fuel injection system

Also Published As

Publication number Publication date
DE10155406A1 (de) 2003-05-22
US20030111051A1 (en) 2003-06-19
DE50208195D1 (de) 2006-11-02
EP1310668B1 (fr) 2006-09-20
US6779741B2 (en) 2004-08-24
EP1310668A3 (fr) 2004-12-15

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