EP1373706B1 - Einspritzventil - Google Patents

Einspritzventil Download PDF

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Publication number
EP1373706B1
EP1373706B1 EP02726068A EP02726068A EP1373706B1 EP 1373706 B1 EP1373706 B1 EP 1373706B1 EP 02726068 A EP02726068 A EP 02726068A EP 02726068 A EP02726068 A EP 02726068A EP 1373706 B1 EP1373706 B1 EP 1373706B1
Authority
EP
European Patent Office
Prior art keywords
valve
piezoelectric actuator
supply pressure
injection
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.)
Expired - Lifetime
Application number
EP02726068A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1373706A1 (de
Inventor
Johannes-Jörg Rueger
Wolfgang Stoecklein
Dietmar Schmieder
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
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1373706A1 publication Critical patent/EP1373706A1/de
Application granted granted Critical
Publication of EP1373706B1 publication Critical patent/EP1373706B1/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
    • F02M63/0031—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • 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
    • 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 an injection valve, in particular an injection valve for an internal combustion engine, according to the manner defined in detail in the preamble of claim 1.
  • Such a valve is known in practice. It is used in particular in conjunction with common rail accumulator injection systems for diesel internal combustion engines.
  • the injection valve is in this case constructed such that it consists of a so-called nozzle module, which comprises an injection nozzle controlled by means of a nozzle needle and is actuated by means of a so-called valve control module, which is designed like a valve.
  • the control of the nozzle module is such that the nozzle module comprises a valve control piston in operative connection with a valve control chamber, in which also the means of Injector is included in the combustion chamber to be injected fluid.
  • the position of the valve control piston and thus also the position of the valve control piston forming a structural unit nozzle needle changes.
  • the valve control module is designed like a valve. It therefore comprises a valve closure member.
  • this valve closing member acts via a so-called outlet throttle of the ruling in the valve control chamber of the nozzle module fluid pressure.
  • the actuation of the valve closing member is effected by means of a piezoelectric actuator, which usually acts on the valve closure member via a so-called actuating piston connected to the piezoelectric actuator, a hydraulic coupler and a so-called actuating piston connected to the valve closing member.
  • valve closing member Upon actuation of the piezoelectric actuator, the valve closing member is lifted from a cooperating with the same valve seat in such a valve control module, so that is reduced via the outlet throttle prevailing in the valve control chamber of the nozzle module pressure, whereby the injector opens.
  • the control of the piezoelectric actuator is usually carried out by means of a microprocessor, which specifies a certain An Kunststoffgradienten.
  • the drive gradient specifies, within which time the voltage required to expand the piezoelectric actuator on the actuator is built up, ie within which time this experiences its maximum elongation.
  • the piezoelectric actuator is usually by means of a mechanical spring, e.g. a coil spring biased in the direction away from the valve closure member.
  • a mechanical spring e.g. a coil spring biased in the direction away from the valve closure member.
  • the reason for this is that the piezoelectric actuator does not withstand tensile forces. In particular, with such tensile forces, the individual layers of a multilayer piezoelectric actuator would be torn apart so that short circuits would occur and the injection valve could no longer be used.
  • the size of the spring preload affects essentially only the operating point of the piezoelectric actuator, but not its lifting capacity.
  • the biasing spring has a relatively large bias.
  • JP 103 067 62 A describes an injection valve for fuel with a needle valve and a piezoelectric actuator.
  • the movement of the needle valve is actuated by a pressure difference between a fuel chamber and pressure chambers.
  • the actuator can thereby expand the space of a pressure chamber and thus generate a pressure drop there.
  • a voltage to be applied to the actuator for injection is determined in a separate calibration measurement, which is carried out at a fixed supply pressure of the fuel.
  • DE 198 48 950 A further describes a device for constant control of a piezoelectric actuator for fuel injection systems.
  • the transmitted electrical charge quantity ⁇ Q is used as the control variable to set a specific stroke of the actuator.
  • a controllable charge generator with a time-defined current profile, in particular a constant current source is used.
  • the fuel pressure is included as a parameter in the actuator control.
  • DE 199 45 670 A relates to a method for controlling a capacitive actuator (in particular a piezo actuator) of a fuel injection valve.
  • a capacitive actuator in particular a piezo actuator
  • the amounts of energy to be supplied to the actuator are determined in dependence on the fuel pressure acting on the actuator.
  • the injection valve according to the invention with the features according to the preamble of claim 1, wherein the An horrgradient is dependent on the supply pressure size, has the advantage that due to the variably designed An horrgradientens regardless of the supply pressure - this is in the case of a common rail injection system, the so-called rail pressure - which effectively acts on the piezoelectric actuator force can be kept constant, and that can reach an operating point-dependent control of the piezoelectric actuator.
  • the An Kunststoffient increases with the supply pressure. This means that at a comparatively low supply pressure the excitation of the system, i. of the piezoelectric actuator, is slower than at a comparatively high supply pressure.
  • This embodiment is based on the fact that in the control of the piezoelectric actuator, the valve closure member must first be opened against the supply pressure. Once the force required to open the valve closure member is applied to the valve closure member, i. When the so-called opening force is overcome, the valve closing member "flies" and the piezoelectric actuator expands very rapidly. Depending on the supply pressure, different forces act on the piezoelectric actuator in this phase. These forces increase with increasing supply pressure.
  • the biasing spring acting on the piezoelectric actuator can be made relatively small and compact and can be provided with a comparatively low bias voltage.
  • the space required for the biasing spring space can be dimensioned comparatively small and a significant cost reduction can be achieved.
  • the embodiment shown in Figure 1 shows an injection valve 1, which is intended in particular for fuel injection into a diesel internal combustion engine.
  • the injection valve 1 comprises a valve control module 2 and a nozzle module 3 with a nozzle body 5, in which a valve control piston 4 is arranged, which forms a structural unit with a nozzle needle, not shown here, and controls or can be identical with this via an injection nozzle.
  • a fuel supply channel 6 is formed in the nozzle body 5 of the nozzle module 3.
  • the fuel supply channel 6 is connected to a high-pressure accumulator, not shown here, common to several injectors, a so-called common rail of conventional design.
  • the fuel guided in the high-pressure supply line 6 can thus be pressurized at a pressure or rail pressure p_R of e.g. up to 1.6 kbar.
  • valve control chamber 7 which is connected to the fuel supply channel 6 via an inlet throttle 8, adjoins the same. About the prevailing in the valve control chamber 7 pressure level, the position of the valve spool 4 and thus that of the nozzle needle is adjusted.
  • the valve control chamber 7 is for this purpose via an outlet throttle 9 with the valve control module 2 in connection.
  • valve control module 2 By means of the valve control module 2, the beginning and the duration of an injection process and the associated injection quantity can be set.
  • a valve member 10 is arranged in the valve control module 2, which is guided in a valve body 11 and which is actuated by means of a piezoelectric actuator 12.
  • the piezoelectric actuator 12 is arranged on the side facing the valve control piston 4 and thus the combustion chamber of the internal combustion engine side of the valve member 10 and acts on a valve member 10 associated piston 14, which is referred to as a control piston.
  • the valve member 10 includes a second piston 15, a so-called actuating piston, which serves to actuate a valve closure member 16.
  • the actuation of the actuating piston 15 itself takes place via a hydraulic coupler 17 which is designed as a hydraulic chamber and transmits the axial deflection of the actuating piston 14 moved by means of the piezoelectric actuator 12 to the actuating piston 15.
  • the hydraulic translation causes the actuating piston 15 makes a stroke increased by the gear ratio of the piston diameter, when the actuating piston 14, which here has a larger diameter than the actuating piston 15, by means of the piezoelectric actuator 12 a certain distance is moved.
  • valve closure member 16 cooperates with a valve seat 22, which is designed here as a ball seat. But it is also possible in another embodiment of the valved valve control module that the valve closing member cooperates with two valve seats and thus forms a double seat valve.
  • valve closure member 16 is arranged in a valve chamber 18, which is separated by a so-called drain chamber 19, wherein a flow channel 20 branches off with unconfirmed piezoelectric actuator 12 by means of the valve seat 22 cooperating valve closure member 16.
  • This drainage channel 20 leads to a leakage connection, not shown, of the injection valve 1, which in turn is in communication with a fuel storage tank.
  • the piezoelectric actuator 12 is biased by means of a biasing spring 21 in the direction away from the valve control piston 4. Furthermore, the piezoelectric actuator 12 is constructed in the usual way of several layers and connected via lines to a valve control unit 30 shown schematically in Figure 2.
  • a voltage gradient dU / dt for driving the piezoelectric actuator 12 is specified during operation of the injection valve 1.
  • This so-called control gradient dU / dt is dependent on the prevailing in the fuel supply line 6 fluid pressure p_R and is set by means of the control unit 30 to the corresponding desired value. This is illustrated in FIG. 2 on the basis of a structure image.
  • the fluid pressure or rail pressure p_R acts via the inlet throttle 8, the valve control chamber 7 and the outlet throttle 9 on the valve closure member 16.
  • a high rail pressure p_R takes place by means of the valve control unit 30 taking place control of the piezoelectric actuator 12 very quickly, ie, the valve control unit 30 is a comparatively large Anêtienten dU / dt before.
  • the valve control unit 30 predetermines a comparatively low drive gradient dU / dt at a low rail pressure p_R.
  • the course of the drive gradient dU / dt as a function of the rail pressure p_R is shown in FIG. As can be seen therein, the drive gradient dU / dt increases with increasing rail pressure p_R.

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)
  • Dram (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP02726068A 2001-03-21 2002-03-21 Einspritzventil Expired - Lifetime EP1373706B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10113560 2001-03-21
DE10113560A DE10113560A1 (de) 2001-03-21 2001-03-21 Einspritzventil
PCT/DE2002/001025 WO2002077437A1 (de) 2001-03-21 2002-03-21 Einspritzventil

Publications (2)

Publication Number Publication Date
EP1373706A1 EP1373706A1 (de) 2004-01-02
EP1373706B1 true EP1373706B1 (de) 2006-06-21

Family

ID=7678255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02726068A Expired - Lifetime EP1373706B1 (de) 2001-03-21 2002-03-21 Einspritzventil

Country Status (7)

Country Link
US (1) US7398933B2 (ja)
EP (1) EP1373706B1 (ja)
JP (1) JP4272887B2 (ja)
AT (1) ATE331134T1 (ja)
DE (2) DE10113560A1 (ja)
HU (1) HU229132B1 (ja)
WO (1) WO2002077437A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7862579B2 (en) 2004-07-28 2011-01-04 Ethicon Endo-Surgery, Inc. Electroactive polymer-based articulation mechanism for grasper
US8317074B2 (en) 2004-07-28 2012-11-27 Ethicon Endo-Surgery, Inc. Electroactive polymer-based articulation mechanism for circular stapler
US7487899B2 (en) * 2004-07-28 2009-02-10 Ethicon Endo-Surgery, Inc. Surgical instrument incorporating EAP complete firing system lockout mechanism
US7147138B2 (en) * 2004-07-28 2006-12-12 Ethicon Endo-Surgery, Inc. Surgical stapling instrument having an electroactive polymer actuated buttress deployment mechanism
US7407074B2 (en) 2004-07-28 2008-08-05 Ethicon Endo-Surgery, Inc. Electroactive polymer-based actuation mechanism for multi-fire surgical fastening instrument
US7857183B2 (en) 2004-07-28 2010-12-28 Ethicon Endo-Surgery, Inc. Surgical instrument incorporating an electrically actuated articulation mechanism
US8905977B2 (en) * 2004-07-28 2014-12-09 Ethicon Endo-Surgery, Inc. Surgical stapling instrument having an electroactive polymer actuated medical substance dispenser
US8057508B2 (en) * 2004-07-28 2011-11-15 Ethicon Endo-Surgery, Inc. Surgical instrument incorporating an electrically actuated articulation locking mechanism
US7513408B2 (en) * 2004-07-28 2009-04-07 Ethicon Endo-Surgery, Inc. Multiple firing stroke surgical instrument incorporating electroactive polymer anti-backup mechanism
CN107387281A (zh) * 2017-07-31 2017-11-24 成都威特电喷有限责任公司 柴油共轨油泵进出油单向阀

Family Cites Families (27)

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Publication number Priority date Publication date Assignee Title
JPH0665872B2 (ja) 1985-09-04 1994-08-24 株式会社日本自動車部品総合研究所 液圧液体の噴射率制御装置
US4784102A (en) * 1984-12-25 1988-11-15 Nippon Soken, Inc. Fuel injector and fuel injection system
JPS61264413A (ja) * 1985-05-20 1986-11-22 Nippon Soken Inc 電歪素子アクチュエータの駆動回路
US4749897A (en) * 1986-03-12 1988-06-07 Nippondenso Co., Ltd. Driving device for piezoelectric element
JPH01113578A (ja) 1987-10-26 1989-05-02 Shiro Kaneshiro 浮力利用水車装置
EP0371469B1 (en) * 1988-11-30 1995-02-08 Toyota Jidosha Kabushiki Kaisha Apparatus for driving piezoelectric element for closing and opening valve member
DE4306072C2 (de) * 1993-02-26 1994-12-08 Siemens Ag Vorrichtung zum Öffnen und Verschließen einer in einem Gehäuse vorhandenen Durchtrittsöffnung
US6082332A (en) * 1994-07-29 2000-07-04 Caterpillar Inc. Hydraulically-actuated fuel injector with direct control needle valve
DE19548526A1 (de) 1995-12-22 1997-07-03 Daimler Benz Ag Einspritzventil
JP3740733B2 (ja) 1996-02-13 2006-02-01 いすゞ自動車株式会社 内燃機関の燃料噴射装置
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DE19711903C2 (de) * 1997-03-21 1999-03-18 Siemens Ag Vorrichtung und Verfahren zum Ansteuern eines piezogesteuerten Kraftstoffeinspritzventils
JP3767082B2 (ja) 1997-05-09 2006-04-19 日産自動車株式会社 燃料噴射弁の製造装置及び製造方法
JP3707210B2 (ja) 1997-07-22 2005-10-19 いすゞ自動車株式会社 燃料噴射制御装置
DE19833830A1 (de) 1998-07-28 2000-02-03 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung wenigstens eines Magnetventils
US6079641A (en) 1998-10-13 2000-06-27 Caterpillar Inc. Fuel injector with rate shaping control through piezoelectric nozzle lift
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US6332455B1 (en) * 2000-10-17 2001-12-25 Mitsubishi Denki Kabushiki Kaisha Device for controlling fuel injection

Also Published As

Publication number Publication date
JP4272887B2 (ja) 2009-06-03
HUP0302434A2 (hu) 2003-10-28
ATE331134T1 (de) 2006-07-15
HUP0302434A3 (en) 2007-02-28
HU229132B1 (en) 2013-08-28
DE10113560A1 (de) 2002-09-26
EP1373706A1 (de) 2004-01-02
US20040050971A1 (en) 2004-03-18
US7398933B2 (en) 2008-07-15
WO2002077437A1 (de) 2002-10-03
DE50207295D1 (de) 2006-08-03
JP2004518885A (ja) 2004-06-24

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