EP0845077B1 - Kraftstoffeinspritzvorrichtung für brennkraftmaschinen - Google Patents

Kraftstoffeinspritzvorrichtung für brennkraftmaschinen Download PDF

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Publication number
EP0845077B1
EP0845077B1 EP97906987A EP97906987A EP0845077B1 EP 0845077 B1 EP0845077 B1 EP 0845077B1 EP 97906987 A EP97906987 A EP 97906987A EP 97906987 A EP97906987 A EP 97906987A EP 0845077 B1 EP0845077 B1 EP 0845077B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve seat
fuel injection
valve member
injection device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97906987A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0845077A1 (de
Inventor
Roger Potschin
Friedrich Boecking
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 EP0845077A1 publication Critical patent/EP0845077A1/de
Application granted granted Critical
Publication of EP0845077B1 publication Critical patent/EP0845077B1/de
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
    • 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
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends

Definitions

  • the invention relates to a fuel injection device for internal combustion engines according to the preamble of the patent claim 1 off.
  • Fuel injection device of this type opens out from Control room coming drain channel into a collection room, the via a further relief line with a Relief room is connected.
  • the valve seat for the valve member is in this collecting space of the control valve provided.
  • This has a drive Piezo on and is as a valve member with a conical Sealing surface executed.
  • This valve fulfills the function of controlling the pressure in the control room, taking into account is that a piezo, in order to be able to work reliably, only pressurized.
  • EP 0 741 244 A (prior art according to Art. 54 (3) EPC) is a Fuel injector disclosed, wherein the closing force required for tight closing of the control valve is required, not from the piezo needs to be applied, but from the pressure in the control room is produced. A high positioning force to be applied by the piezo is only required for opening the valve, here again the piezo from the set pressure in the control room Pressure is applied. Once the valve has opened, becomes the actuating movement or the opening of the control valve counteracting force quickly dissipated, so that also in in this case the piezo does not experience any significant stress.
  • the invention provides according to claim 1 of that two valve seats in series with each other in the course of Outflow to relieve pressure in the control room via the Drain channel are provided.
  • the actuator moves Valve member in the direction of the control room is the one with the Valve member and the first valve seat formed valve opened and subsequently that of the valve member with the second valve seat formed valve closed. If that Valve element on the first valve seat with its sealing surface pressure is built up in the control room in the sense closing the fuel injector. Should that Sinspritzventil come in the open position, so lifts to one Actuation of the piezo towards the valve member from the first Valve seat from. It can according to claim 2 in one Intermediate position remain in the on both valve seats the flow cross-section is open.
  • valve seat on an elastically deformable intermediate part educated This has the advantage that the required working capacity of the piezo to drive the Valve member of the control valve can be kept even lower can.
  • the valve member of the control valve comes after the Open the cross-section at the first valve seat in the system the second valve seat is on the elastically deformable In between a differential pressure.
  • On the control room opposite side is a pressure relief to Relief room forward while closed Cross section on the second valve seat in the control room the high There is pressure.
  • FIG. 1 shows a schematic Representation of a fuel injection device with Supply from a high pressure accumulator and one from one Control valve controlled fuel injector known Type
  • Figure 2 is a partial section through a known Fuel injector accordingly the section A of Figure 1 showing the control room and one in a piezo not shown driven valve member of the control valve
  • Figure 3 shows a first Embodiment of the invention with a Control valve that has a first and a second valve seat has a modified form of leadership of the Drain channel
  • Figure 4 the injector stroke based on the Adjustment stroke of the control valve member
  • Figure 5 a second Embodiment modified from the embodiment according to Figure 3 with a second valve seat on a elastically deformable intermediate part is formed in one first position of the valve member of the control valve on the first Valve seat
  • Figure 6 is a representation of the control valve with in Close position on the second valve seat Valve member in a modified form, with according to Figure 5 provided
  • a fuel injector with the high Injection pressures and little effort a large variation fuel injection, especially with very precise controllable injection times and injection quantities possible is through a so-called common rail system realized.
  • the invention is both in this so-called Common rail system as well at one Fuel injection pump can be used.
  • the common rail system preference is to be given.
  • Figure 1 is related to a common rail pressure supply system as a high-pressure fuel source High-pressure fuel reservoir 1 provided by a High-pressure fuel delivery pump 2 from one Fuel tank 4 is supplied with fuel.
  • the pressure in the high-pressure fuel accumulator 1 is determined by a pressure control valve 5 in connection with a pressure sensor 6 controlled by an electrical control device 8. This also controls a fuel injection valve 9.
  • This is in the executed example as an elongated valve needle executed that at one end a sealing surface 15th owns that with an internal valve seat interacts.
  • the valve needle is inside a through a pressure line 17 with the High-pressure fuel accumulator 1 connected pressure chamber 16 inside the valve body.
  • a compression spring 19 arranged between a valve plate 20 and the Valve housing is clamped axially and that Injection valve member 14 is applied in the closing direction.
  • a plunger 21 is provided coaxially with the compression spring on the one hand rests on the valve plate 20 and on the other hand in a guide bore 22 dips and there with his End face 23, which forms a movable wall, a Control room 25 with the closed end of the guide bore includes.
  • An inflow channel 26 opens into this control chamber, in which a throttle 27 is arranged and that of the pressure chamber 16 always fuel under high pressure via the Throttle 27 in the control chamber 25 supplies.
  • the confluence of the drain channel 29 in the relief chamber 30 is in this known injection valve by a Valve member 34 of a control valve 36, which acts as a seat valve is formed, controlled, this valve member by a piezo 35 in the closed position or in the open position can be brought.
  • the known fuel injection device works here as follows:
  • FIG. 2 A section of FIG. 2 is shown a fuel injection valve that shown in Figure 1 shown basic type, wherein the figure 2 a Section A on this fuel injector corresponds.
  • the end face 23 is again there as a movable wall on the plunger 21 enclosing the control chamber 25 educated.
  • the control room opens on the side Circumferential wall of the guide bore 22 of the inflow channel 26 with the Throttle 27, such that the inflow through the plunger in each of his positions is not locked.
  • the guide bore 22 leads through a recess 38 in this end face 37 of the drain channel 129.
  • a valve member 44 acts here with the valve seat 39 opposite the valve member 34 of the control valve 36 from Figure 1 modified form together.
  • An introduction of the inflow channel 26 in one part of the Residual space-forming annular recess 28 offers the main advantage that the one shown in Figure 10 Inflow channel 726 introduced obliquely to the axis of the plunger 721 can be, starting from one of the pressure supply of the Pressure chamber 16 serving bore 59, which is parallel to the axis of the injection valve is guided. Will the injector body at the transition to relief chamber 30 (FIG. 1) separated, then the inflow channel 726, from the mouth 61 of the parallel bore 59 of this Partition plane 60 drilled obliquely to the residual space 738 become.
  • the drain channel can be used according to FIG 229 also lead away from the control room 25.
  • Figure 3 also shows the advantageous Embodiment of the invention, which is that here analogous to Figure 2 provided valve seat now a first Is valve seat 139, on which the space 40 in turn adjoins, of which the drain channel 229 then via a leads second throttle 142 to the relief chamber. additionally this first valve seat 139 is now a second one Valve seat 49 is provided, which is coaxial with the first valve seat 139 opposite to the side of the control room 25 is arranged.
  • the drain channel 229 has in one Intermediate area on a valve space 50, in which the for example spherical head 146 of the Valve member 144 can immerse.
  • the first is for a spherical head Sealing surface 147 to the side of the first valve seat 39 trained and this a second Sealing surface 152 realized in continuation of the spherical shape.
  • This second sealing surface is when the Valve member 144 for abutting the second valve seat 49 brought and in this position closes the valve member 144 after opening the drainage channel in the meantime 229 this again.
  • Relief of the control room 25 such that the Injector member can open briefly.
  • FIG. 4 shows the stroke profile of the injection valve member 14 and assigned to the Stroke course of the valve member 144 of the control valve over the Time.
  • Diagram shows that from the starting position with the stroke 0 the valve member 144 covers a stroke over which the Pre-injection takes place. At the stroke he is Pre-injection ended and also the largest displacement of the Valve member 144 reached.
  • valve member 144 After persistence over time SU in this end position, the Valve member 144 in an intermediate cell ZS, in which the Cross sections opened on both valve seats 139 and 49 are for performing the main injection HE and then the final return to the first Valve seat 139.
  • the valve seats are located 139 and 49 preferably coaxial one behind the other and coaxial to the valve lifter of valve member 144. On both Valve seats each become a seat valve in this way realized.
  • second valve seat as valve seat 349 on an elastic deformable intermediate part 55 is arranged.
  • This one has for example the shape of a disc, which is preferably made of There is metal and between two halves of the valve housing 11 is tightly clamped. It points coaxially to the plunger 21 or to the valve member 244 on a through hole 56 connects the valve chamber 150 to the control chamber 125.
  • the Entry of the through hole 56 in the valve chamber 150 is formed as a second valve seat 349 on which the second Sealing surface 352 of the valve member 344 in its maximum deflected position comes close to the system.
  • the head 346 of the valve member 344 carries a first sealing surface 347 Conical surface and as a second sealing surface 352 a spherical Surface, in a modification of the exemplary embodiment according to FIG. 3. But it could also be a configuration of the head 46 of Figure 2 apply here.
  • On the control room side 125 points out the elastically deformable intermediate part annular, concentric to the through hole 56 Recess 57 with which it is achieved that the elastic deformable intermediate part starting at this annular Recess 57; especially upwards to valve member 344 can be deflected more easily. This property leaves but also through different kinds of reductions in the strength of the Achieve intermediate.
  • one above the other lying diagram parts above is the lifting movement of the Injection valve member 14 reproduced, again with the Area of the pre-injection VE, the injection break SU and the Main injection HE.
  • curve M the movement of the elastic intermediate part played.
  • a starting position hm0 is referred to the travel of the valve member 444 the intermediate part with the second valve seat 349 brought into a position hm1. The begins at the end of the stroke of valve member 444 if the valve member starting from the initial position V0 in the Position hm0 comes into contact with the intermediate part.
  • the requirements for the The maximum stroke of the piezo is therefore less, since the actual closing force to the second valve seat 349 itself along with the deformation of the elastically deformable In between sets. This is essential advantageous because of the size of a piezo drive and the provided energy with the size of the required Stroke increases significantly. In the way shown here can the required stroke with the same power of the Control valve can be reduced.
  • Figure 8 shows another Variant with a head 546 of the valve member 544, which as first and second sealing surface each a conical Has sealing surface 547 and 552. They are accordingly Valve seats trained. Ultimately, it is also possible instead of a conical second sealing surface 552 also one Realize flat seat sealing surface with accordingly trained second valve seat.
  • valve member 644 of Figure 9 in two parts be carried out in such a way that it has a head 646, which carries the first sealing surface 647 and on which this Side facing away from the sealing surface has a guide surface 59 which is hydraulically coupled to the valve member 644 second valve member 60 is guided.
  • This is in the executed example realized as a ball with a spherical, but preferably with a conical second valve seat 649 cooperates.
  • the ball 60 by the pressure in the control room 625 in contact Valve member 644 held. When actuated, this comes out on the second valve seat 649 to the system.
  • one Ball can be used as a standard part with a tight fit achieve the valve seat.

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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)
EP97906987A 1996-06-15 1997-01-09 Kraftstoffeinspritzvorrichtung für brennkraftmaschinen Expired - Lifetime EP0845077B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19624001 1996-06-15
DE19624001A DE19624001A1 (de) 1996-06-15 1996-06-15 Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
PCT/DE1997/000019 WO1997048900A1 (de) 1996-06-15 1997-01-09 Kraftstoffeinspritzvorrichtung für brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0845077A1 EP0845077A1 (de) 1998-06-03
EP0845077B1 true EP0845077B1 (de) 2003-01-22

Family

ID=7797086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97906987A Expired - Lifetime EP0845077B1 (de) 1996-06-15 1997-01-09 Kraftstoffeinspritzvorrichtung für brennkraftmaschinen

Country Status (10)

Country Link
US (1) US5975428A (zh)
EP (1) EP0845077B1 (zh)
JP (1) JP3916670B2 (zh)
KR (1) KR100482901B1 (zh)
CN (2) CN1080825C (zh)
BR (1) BR9702305A (zh)
DE (2) DE19624001A1 (zh)
ES (1) ES2191169T3 (zh)
RU (1) RU2170846C2 (zh)
WO (1) WO1997048900A1 (zh)

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JP5565291B2 (ja) * 2010-12-08 2014-08-06 株式会社デンソー 燃料噴射装置
DE102011090060A1 (de) * 2011-12-28 2013-07-04 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
GB201411162D0 (en) * 2014-06-24 2014-08-06 Delphi International Operations Luxembourg S.�.R.L. Control valve
JP6172189B2 (ja) * 2015-03-23 2017-08-02 マツダ株式会社 直噴エンジンの燃料噴射制御装置
DE102016207747A1 (de) 2016-05-04 2017-11-09 Robert Bosch Gmbh Kraftstoffeinspritzventil
CN108798956B (zh) * 2018-06-13 2020-09-08 中国北方发动机研究所(天津) 一种共轨喷油器控制油路结构

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EP0741244A2 (de) * 1995-05-03 1996-11-06 Institut für Motorenbau, Prof. Huber GmbH Einspritzdüse

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WO1997048900A1 (de) 1997-12-24
KR100482901B1 (ko) 2005-08-04
RU2170846C2 (ru) 2001-07-20
BR9702305A (pt) 1999-03-02
US5975428A (en) 1999-11-02
CN1358934A (zh) 2002-07-17
EP0845077A1 (de) 1998-06-03
KR19990036336A (ko) 1999-05-25
DE19624001A1 (de) 1997-12-18
ES2191169T3 (es) 2003-09-01
CN1080825C (zh) 2002-03-13
CN1184416C (zh) 2005-01-12
JPH11510879A (ja) 1999-09-21
DE59709189D1 (de) 2003-02-27
CN1189877A (zh) 1998-08-05
JP3916670B2 (ja) 2007-05-16

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