EP1210512B1 - Injektor - Google Patents

Injektor Download PDF

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Publication number
EP1210512B1
EP1210512B1 EP00958238A EP00958238A EP1210512B1 EP 1210512 B1 EP1210512 B1 EP 1210512B1 EP 00958238 A EP00958238 A EP 00958238A EP 00958238 A EP00958238 A EP 00958238A EP 1210512 B1 EP1210512 B1 EP 1210512B1
Authority
EP
European Patent Office
Prior art keywords
valve body
control
section
injector
valve
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
EP00958238A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1210512A1 (de
Inventor
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 EP1210512A1 publication Critical patent/EP1210512A1/de
Application granted granted Critical
Publication of EP1210512B1 publication Critical patent/EP1210512B1/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
    • 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
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • F02M63/0042—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing combined with valve seats of the lift valve type
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention is based on an injector for control an injection process of fuel into a combustion chamber an internal combustion engine corresponding to the genus of Claim 1.
  • injectors are used in particular for Injection systems used in which a pressure generator a pressure accumulator with pressure medium under high pressure supplied, with several injectors to the pressure accumulator are connected.
  • Such systems are also called common rail injection systems designated.
  • This injector has a closing element that, among other things, of a hydraulic pressure force of an actuator is acted upon.
  • the actuator consists of a piezoelectric actuator and one of these actuated valve body. This is for controlling Pressure medium connections between a low pressure and a High-pressure pressure medium channel slidable in one Control bore performed.
  • the valve body thus determines the hydraulic component of a pressure force with which the Locking element of the injector in its closed position is held. The actuator is in this closed position electrically controlled.
  • valve body In the non-activated state, the valve body opens the Pressure medium connection to the low pressure leading Pressure medium channel, which makes the closing element hydraulic is relieved and a lifting movement against the force of Compression spring executes.
  • the closing member gives openings free through the fuel in the combustion chamber one Internal combustion engine can inject.
  • the actuator has two each other opposite control cross-sections so that with a single stroke of the valve body Pre-injection and a main injection can be controlled. Together with the valve body, these two form Control cross sections two in the direction of movement Valve body seat valves one behind the other.
  • Double seat valve the tightness of the valve seats only then is given when the valve body is guided particularly precisely aligned. This increases the cost of manufacturing the Individual parts.
  • an injector with the characteristic Features of claim 1 the advantage that he with a Valve body is equipped because of less Precision requirements can be manufactured more cheaply.
  • a throttle gap for example, by Pairing of individual parts in assembly in defined Limits is durable. So that the pressure medium flow to the adapted to the respective conditions of use of the injection system without providing separate chokes. the Valve body comes alongside its control and its Leadership function thus also a throttle function. This will reduce the number of parts used and the Assembly effort of the injector reduced.
  • the valve body is in to control the main injection an intermediate position, in which both Tax cross sections are open.
  • this intermediate position the wall of the hydraulic part is shaped such that the valve body has no significant throttling effect.
  • the Pressure medium flow in the combustion chamber is therefore almost unthrottled and thus insensitive to Influences of temperature or pressure.
  • FIG. 1 is with the item number 10 Injection system, which consists essentially of a Feed pump 12, a pressure accumulator 14, one Pressure control valve 16 and the fuel in one does not Shown combustion chamber of an internal combustion engine injecting injector 18.
  • the feed pump 12 supplies the pressure accumulator 14 with fuel High pressure, the pressure control valve 16 with a pressure sensor 20 and an electrical Control device 22 cooperates.
  • the pressure accumulator 12 is under high pressure via pressure medium leading inlet channels 24 with several injectors 18 hydraulically connected.
  • injectors 18 hydraulically connected.
  • FIG. 1 there is only one example of these injectors 18 shown.
  • the latter has a housing 26, in the interior 28 of a closing member 30 movable is led. This is in the form of a valve needle executed by a compression spring 32 in the direction of shown closed position is acted upon.
  • the one prestressed compression spring 32 is supported a plate 34 formed at the end of the closing member 30 and on the wall of the plate opposite the plate 34 Interior 28 from.
  • a coaxial acts on the plate 34 in addition to the compression spring 32 to the locking member 30 arranged plunger 36. This is with its cylindrical shaft 38 in a pressure medium acted upon guide bore 40 of the housing 26 out.
  • a throttle 58 is installed. About that an opening 42 also opens into the guide bore 40 a, which leads to a control channel 44 of the injector 24.
  • the Control channel 44 is located above an unpressurized drain channel 46 with a fuel tank 48 in connection.
  • the mouth cross section of the opening 42 in the Control channel 44 is designed as a valve seat 50. This closes a and guided in the control channel 44 Valve body 54 acted upon by an actuator 52.
  • an actuator 52 is preferably one of control device 22 electrically controllable piezo used.
  • the described injection system 10 works as follows:
  • valve body 54 in the position shown and closes the valve seat 50.
  • This is the Pressure medium connection between the high pressure Interior 28 of the injector 18 and the Fuel tank 48 interrupted.
  • the thereby on the End face of the plunger 36 acting compressive force supports the compression spring 32 and holds the closing member 30 closed.
  • Through the openings 31 of the housing 26 can thereby no fuel to the combustion chamber of the shown internal combustion engine.
  • valve body 54 opens the above Pressure medium connection between the high pressure and the Low pressure leading areas of the injector 18, whereby the control channel 44 is relieved of pressure and thus the Pressure force on the plunger 36 is eliminated.
  • the closing member 30 moves from its closed position to its Open position and there are the openings 31 of the housing 26 free. An injection process of fuel can thus respectively.
  • the injector 18 closes again.
  • throttle 58 can be the pressure ratio in the high pressure leading area of the Injector 18 and thus the injected per unit of time Determine fuel quantity.
  • valve body 54 in FIG. 1 is only one single valve seat 50 controls are from the entrance recognized state of the art facilities already known where two valve seats in the direction of actuation Valve body 54 are arranged one behind the other. So that will achieved that with a single stroke of the Valve body 54 two successive injections can be generated. This allows shorter switching times of the Injector 18 with a simultaneously reduced drive frequency of the actuator 52. This reduces that of the actuator 52 generated and its operational safety impairing Waste heat.
  • two have coaxial to each other Valve seats have the disadvantage that the tightness of this Valve seats 50 is only given when the leadership of the Valve body 54 is precisely aligned with the valve seats 50. This requires a high level of manufacturing technology leads to an increase in price of the injector 18.
  • FIG. 2 only the structurally modified area of the injector 18 shown. This section corresponds to that in FIG. 1 detail marked with X.
  • the valve body 54 consists of a cylindrical valve stem 60, which on its one End is connected to a thickened control head 62.
  • the latter has a conical section 62a on which a cylindrical section 62b adjoins. This goes into an outwardly bulging section 62c, which the forms the front end of the control head 62.
  • On the Valve stem 60 is on the control head 62 opposite end of the valve body 54 is a sleeve 64 pressed with an annular circumferential support collar 66. Between the support collar 66 and a shoulder of the housing 26 the compression spring 32 is clamped.
  • the valve body 54 is in a multiple offset Control channel 44 guided. This is divided into one matched to the diameter of the valve stem 60 Guide section 44a, a first extension 44b, with the valve stem 60 forms an annular space in which the Drain channel 46 opens, a second extension 44c, in the control head 62 of the valve body 54 axially is arranged displaceably and in a constriction 44d, that compared to the extension 44c in diameter withdrawn at right angles.
  • the transition from the first Extension 44b to the second extension 44c is a chamfer formed, which acts as a valve seat 50.
  • first control cross section 68 is from controlled conical section 62a of the valve body 54, while the neck 44d has a second control cross section 70 forms the open in the position shown in Figure 2 is.
  • This second control cross section 70 has a diameter thus on the cylindrical portion 62b of the valve body 54 matched that in the maximum deflected state of the Valve body 54 between the two components Defined throttle gap 72 arises.
  • the latter is for example, by pairing the components in the Assembly of the injector 18 can be fixed to the Determine pressure medium flow to the drain channel 46.
  • the second Extension 44c of the control channel 44 is radial and axial dimension designed so that the valve body can be brought into an intermediate position by the actuator 52, in the two control sections 68 and 70 opened at the same time are and the control head 62 no significant throttling Has an effect.
  • the constriction 44d opens out from the valve body 54 end facing away from the pressure medium connection 56. As already explained, this represents a hydraulic one Coupling of the control channel 44 with the interior 28 of the Injector 18 ago. Located in the pressure medium connection 56 throttle 58.
  • the plunger 36 is only a portion of the shaft 38 in FIG. 2 recognizable. This is displaceable in the guide bore 40 out into which the inlet channel 24 opens radially.
  • valve body 54 In the basic position according to FIG. 2, the Valve body 54 the first control channel 68 and interrupts so that a pressure medium connection from the inlet channel 24 to Drainage channel 46. This results in the guide bore 40 the high pressure of the inlet channel 24. This acts on the Tappet 36 and thus holds the closing member 30 of the Injector 18 closed. Actuation of the actuator 52 forces the valve body 54 to a stroke movement, in the Final stage of the cylindrical portion 62b of the control head 62 at least in sections in the constriction 44d limited second control cross section 70 immersed. Before however, if this happens, there is a short-term Pressure medium connection between the inlet channel 24 and the Drain channel 46, during which the plunger 36 relieves pressure is. This opens the control member 30 in the injector 18 and enables a so-called pre-injection of fuel.
  • valve body 54 With a gradual withdrawal of the control of the actuator 52, the valve body 54 can be in an intermediate position in which both tax cross-sections 68 and 70 are open and the main injection expires.
  • the pestle 36 is depressurized during this.
  • the per Unit of time injected amount of fuel is from the throttle 58 determined.
  • Valve seat 50 After the full withdrawal of the Control of the actuator 52 closes the control head 62 Valve seat 50 and interrupts the pressure medium connection between the inlet channel 24 and the outlet channel 46.
  • Der sich in the guide bore 40 now builds up pressure Tappet 36 and thus the closing member 30, which then in its closed position returns. With one The stroke movement of the actuator 52 can thus be two in time control separate injection processes without the valve body 54 high demands with respect to precise alignment of the guide of the valve body 54 with the Control cross sections 68 and 70 must meet.

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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)
  • Disintegrating Or Milling (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Glass Compositions (AREA)
EP00958238A 1999-08-20 2000-08-10 Injektor Expired - Lifetime EP1210512B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19939445 1999-08-20
DE19939445A DE19939445A1 (de) 1999-08-20 1999-08-20 Injektor
PCT/DE2000/002675 WO2001014715A1 (de) 1999-08-20 2000-08-10 Injektor

Publications (2)

Publication Number Publication Date
EP1210512A1 EP1210512A1 (de) 2002-06-05
EP1210512B1 true EP1210512B1 (de) 2004-11-03

Family

ID=7918971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958238A Expired - Lifetime EP1210512B1 (de) 1999-08-20 2000-08-10 Injektor

Country Status (7)

Country Link
EP (1) EP1210512B1 (ko)
JP (1) JP2003507641A (ko)
KR (1) KR20020025982A (ko)
AT (1) ATE281598T1 (ko)
CZ (1) CZ2002608A3 (ko)
DE (2) DE19939445A1 (ko)
WO (1) WO2001014715A1 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10120157A1 (de) * 2001-04-25 2002-11-07 Bosch Gmbh Robert Kraftstoffinjektor mit Steuerventil-integriertem Drosselelement
DE10160264A1 (de) * 2001-12-07 2003-06-18 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08158981A (ja) * 1994-12-02 1996-06-18 Nippondenso Co Ltd 燃料噴射装置
US5680988A (en) * 1995-01-20 1997-10-28 Caterpillar Inc. Axial force indentation or protrusion for a reciprocating piston/barrel assembly
DE19624001A1 (de) * 1996-06-15 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
AUPO501897A0 (en) * 1997-02-10 1997-03-06 Invent Engineering P/L Hydraulically actuated electronic fuel injection system
DE19742073A1 (de) * 1997-09-24 1999-03-25 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen

Also Published As

Publication number Publication date
EP1210512A1 (de) 2002-06-05
JP2003507641A (ja) 2003-02-25
CZ2002608A3 (cs) 2003-06-18
DE19939445A1 (de) 2001-03-01
KR20020025982A (ko) 2002-04-04
ATE281598T1 (de) 2004-11-15
WO2001014715A1 (de) 2001-03-01
DE50008529D1 (de) 2004-12-09

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