EP1144859B1 - Einspritzeinrichtung und verfahren zum einspritzen von fluid - Google Patents

Einspritzeinrichtung und verfahren zum einspritzen von fluid Download PDF

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Publication number
EP1144859B1
EP1144859B1 EP00984833A EP00984833A EP1144859B1 EP 1144859 B1 EP1144859 B1 EP 1144859B1 EP 00984833 A EP00984833 A EP 00984833A EP 00984833 A EP00984833 A EP 00984833A EP 1144859 B1 EP1144859 B1 EP 1144859B1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
injection
booster
space
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
EP00984833A
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German (de)
English (en)
French (fr)
Other versions
EP1144859A1 (de
Inventor
Hans-Christoph Magel
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 EP1144859A1 publication Critical patent/EP1144859A1/de
Application granted granted Critical
Publication of EP1144859B1 publication Critical patent/EP1144859B1/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
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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 relates to an injection device with a Injection nozzle, a valve device for controlling the Injection and an actuating element for actuating the valve device.
  • the invention further relates to a method for injecting fluid in which activates an actuator is, a valve device actuated by the actuator and an injection nozzle is opened.
  • a generic device and a generic method are known for example from EP 0 562 046 B1.
  • the basic requirement of such a system is the fuel injection with the largest possible injection pressure make.
  • a high injection pressure has positive Influences on the function of an engine; for example Be the pollutant emissions and fuel consumption reduced.
  • a pressure booster can be provided which by a hydraulic translation a primary, about one Accumulator provided pressure in the desired high injection pressure.
  • valve device To control the injection, is a valve device provided in turn by an actuator, such as a Solenoid valve or a piezoelectric actuator is operated.
  • actuator such as a Solenoid valve or a piezoelectric actuator is operated.
  • These Valve device serves both the supply of the primary to amplifying pressure to the pressure intensifier as well as to Relief and refilling the pressure intensifier after successful pressure boost and the associated injection through the injector.
  • the prior art uses as a valve device 3/2-valve.
  • a first switching state of the 3/2 valve is the fuel flow between a fuel inlet and the primary side of the booster locked.
  • the 3/2-valve goes into a transient state in which both a connection between the fuel inlet and the primary side of the booster as well as between the primary side of the booster and the leak system.
  • the second switching state of the 3/2 valve assumed in which the connection of the primary side the booster with the leak system is locked, the Connection between the fuel inlet and the primary side however, remains open.
  • a generic pressure amplification is particularly related useful with a common rail system.
  • “common rail” are the primary pressure generation and the injection decoupled.
  • the injection pressure becomes independent of the engine speed and the injection quantity generated and in the "rail" (fuel storage) for injection provided.
  • the pressure in the common rail is currently still up about 1600 bar limited, so that for emission reasons and reasons of fuel consumption, an increase in pressure desired is.
  • a pressure amplifier in combination with a Common rail system could thus have particularly good results deliver. Nevertheless, the problems mentioned above exist by using the 3/2 valve, giving a total of one harmful influence on the function of the injection system takes.
  • the injection device according to the invention according to claim 1 builds on the state of the art in that the valve device at least a first valve and a second Valve, which of the actuating element via a common hydraulic coupling space are actuated. On this way, e.g. avoided the disadvantages with the Use of a 3/2-valve in the prior art occur. Since the two valves actuated by the same actuator are at this point the equipment in the Not compared to using a single 3/2 valve increased so that there is an overall improvement of the system. For example, it can be achieved that the valves by a suitable adjustment of elastic means to different Time points on the operation by the Actuate react.
  • the hydraulic coupling space is used also a possibly required force-displacement-translation and the compensation of tolerances, e.g. Changes in length.
  • the actuator is a piezoelectric actuator.
  • piezo actuators have themselves as electronically controllable control elements proven, especially since they are compact in their construction and work reliably.
  • the control function is through Modification of the parameters (voltage, pulse duration) of the control variable.
  • the primary pressure is from a common rail made available. It is thus possible to take advantage a common rail system with the pressure-boosted injector to combine.
  • the common rail pressure which currently limited to about 1600 bar, can be pressure-boosted become; thus emissions and fuel consumption reduced.
  • the injection system is pressure-controlled. In this way it can be ensured that the injection nozzle actually only above a certain threshold pressure opens. This is the benefits of the injection guaranteed under high pressure under all circumstances.
  • the first valve separates in a first state the primary pressure from a low-pressure chamber of the intensifier, and the first valve couples in a second state the primary pressure in the low-pressure chamber of the booster one.
  • the first valve as a metering valve used, with its opening states the system supply determine with fuel decisively.
  • the second valve in a first Condition a low-pressure chamber of the booster with a Leakage system couples and the second valve in a second Condition the low pressure chamber of the booster from the Leak system separates.
  • the second valve can thus serve as a relief valve serve for the pressure booster; Furthermore, the Fill the pressure booster via the second valve.
  • first valve and the second valve are coordinated so that by pressing of the actuating element initially from the second valve its first state into its second state convertible and then the first valve from its first state can be converted into its second state. It is thus achieved that the opening cross sections of the valves are not overlap. This leads to a significant reduction of accumulating leakage, because the second valve is already closed when the first valve is still in its closed position Initial state remains. Furthermore, a multiple (clocked) opening and closing the first valve at closed second valve possible.
  • a check valve connected, via which the high-pressure chamber filled is.
  • a check valve prevents the high pressure from the high pressure chamber of the pressure intensifier in the low pressure space of the pressure booster arrives; on the other hand allows the check valve the filling of the high-pressure chamber from the low-pressure chamber.
  • a differential space of the pressure booster is over a check valve connected to the leak system, so that the differential space is not filled.
  • the check valve Although allows that occurring in the difference space Leakage leak into the leak system; the check valve prevents, however, that a filling of the difference space takes place, what the entire volume to be filled in an advantageous Way reduced.
  • the high pressure chamber of the booster over the second valve is relieved. This way a can faster relief of the injector made as in the Variant with a discharge on the low pressure side of the Booster.
  • the valve system an increased load due to the high Pressure in the high pressure chamber learns.
  • first valve and / or the second valve (on) 2/2 valve is / are.
  • required logical switching functions executable which be adopted in the art of a 3/2-valve.
  • the first valve and the actuating element are so matched to each other, that the first valve continuously or in stages in different opening states different opening cross sections can be transferred.
  • This can, for example, in connection with a pilot injection be beneficial.
  • Via a throttle in the valve seat the first valve can be very small pre-injection quantities be realized with reduced injection pressure.
  • This can be the fast Switching time of a piezoelectric actuator can be advantageously used.
  • due to the cross-sectional control of the first valve reaches a shaping of the injection curve become.
  • the invention is based on the generic method according to Claim 13 characterized in that a first valve and a second Valve of the valve device from the actuator over a common hydraulic coupling space can be actuated.
  • a first valve and a second Valve of the valve device from the actuator over a common hydraulic coupling space can be actuated.
  • two valves used as a replacement for a 3/2 valve nevertheless, the procedure can be simple be designed. It is only a single control element and whose preferably electronic control required to operate both the first valve and the second valve.
  • a pressure booster for amplifying a primary pressure actuated by the valve means.
  • a pressure booster for amplifying a primary pressure actuated by the valve means.
  • the injector is opened when in its feed area a certain pressure is exceeded.
  • a certain pressure is exceeded.
  • the method is developed so that when Actuate the actuator a low pressure chamber of the pressure booster from one leakage system by closing the second Valve is decoupled, then the primary pressure in the Low-pressure chamber coupled by opening the first valve is, then the pressure in a feed region of the injection nozzle exceeds a certain pressure, so that the Injector opens, then the first valve closes and then the second valve opens so that the injection stopped and the pressure intensifier is relieved.
  • the switching states are suitable for rapid Allow pressure build-up and also a reliable discharge pressure booster and injector.
  • several switching operations of the first Valve possible with the second valve closed.
  • the high-pressure chamber of the pressure intensifier via a check valve filled, over which he with the Low pressure space is connected.
  • a check valve filled, over which he with the Low pressure space is connected.
  • a sufficient fluid reservoir is present, is it useful for filling the high pressure chamber to use via a check valve.
  • the check valve is the high pressure from the high pressure chamber do not pass into the low-pressure chamber of the booster; he is completely to control the injector used.
  • the high pressure space of the Pressure booster is filled via a check valve, via which it is connected to the leak system. It lies then a complete decoupling of low pressure space and High-pressure chamber of the pressure intensifier, and nevertheless will a filling of the high-pressure chamber from a reservoir sufficient Size allows.
  • the first valve is continuous or stepwise transferred into different opening states. It leaves in this way with the first valve as a metering valve a shaping of the course of injection as well as a pre-injection with small pre-injection quantity and reduced injection pressure realize. This is favored by the with a piezo actuator possible fast switching times.
  • the invention is based on the surprising finding that through the use of two valves, an injection device, especially with pressure booster, in more reliable Way can be controlled.
  • the disadvantages of the use of a 3/2 valve are eliminated; Furthermore, there is no unfavorable increase in the apparatus Effort. It should be emphasized that only one single actuator for operating both valves sufficient is.
  • FIG. 1 is a schematic representation of an injection device according to the invention.
  • FIG. 1 shows an injection device 10, which in particular can be used in diesel engines.
  • the injector 10 includes an injector 12 with which diesel fuel injected into the combustion chamber 14 of an engine becomes.
  • the injector 12 becomes fuel at high pressure supplied from a pressure amplifier 16.
  • This pressure booster 16 is operated by a valve device, a first 2/2-valve 18 and a second 2/2-valve 20 has.
  • Both 2/2 valves 18, 20 are controlled by a single actuator operated, which in the present embodiment is realized as a piezoelectric actuator 22.
  • the piezoelectric actuator 22 controls the two 2/2 valves via a common coupling space 24 on.
  • the primary pressure is the first 2/2 valve of one Common rail 26 fed, in which usually a Pressure between 300 and 1000 bar prevails, whereby Maximaldrükke 1600 bar in the common rail 26 can be reached.
  • the pressure in the common rail 26 is by a quantity-controlled high-pressure pump 28 constructed with a fuel tank 30 in Connection stands.
  • the piezoelectric actuator 22 activated.
  • the force of the piezoelectric actuator 22 is via the coupling space 24 simultaneously on the first 2/2-valve 18 and the second 2/2-valve 20 transmitted.
  • the first 2/2 valve 18 is closed, while the second 2/2 valve 20 is open.
  • the closed state of the first 2/2-valve 18 causes the low pressure chamber 32 of the Pressure booster 16 of the primary pressure in the common rail 26th is decoupled.
  • the open state of the second 2/2 valve 20 has the consequence that the low pressure chamber 32 of the booster 16 is connected to a leak system 34.
  • the one in the low-pressure room 32 of the booster 16 is generated pressure amplified by the pressure booster 16, so that a high pressure occurs in the high-pressure chamber 36 of the booster 16. This is transferred to the pressure-controlled injection nozzle 12, the Injector 12 opens when exceeding a threshold pressure, and the injection takes place at the corresponding high pressure point.
  • the basic procedure described can be in modify in a variety of ways, especially with regard to to a distinction between pilot injection and main injection as well as on the shaping of the course of injection.
  • Such changes can be advantageously by an adaptation of the system of piezoelectric actuator 22 and the accomplish first 2/2-valve 18, in particular by a gradual opening of the first 2/2 valve in continuous or discontinuous manner.
  • the adaptation of the first 2/2-Valves takes place via the involved hydraulic Cross-sections.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
EP00984833A 1999-10-22 2000-10-17 Einspritzeinrichtung und verfahren zum einspritzen von fluid Expired - Lifetime EP1144859B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19951005 1999-10-22
DE19951005A DE19951005A1 (de) 1999-10-22 1999-10-22 Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
PCT/DE2000/003657 WO2001029409A1 (de) 1999-10-22 2000-10-17 Einspritzeinrichtung und verfahren zum einspritzen von fluid

Publications (2)

Publication Number Publication Date
EP1144859A1 EP1144859A1 (de) 2001-10-17
EP1144859B1 true EP1144859B1 (de) 2005-04-06

Family

ID=7926578

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EP00984833A Expired - Lifetime EP1144859B1 (de) 1999-10-22 2000-10-17 Einspritzeinrichtung und verfahren zum einspritzen von fluid

Country Status (8)

Country Link
US (1) US6626369B1 (cs)
EP (1) EP1144859B1 (cs)
JP (1) JP2003512564A (cs)
CN (1) CN1158460C (cs)
AT (1) ATE292753T1 (cs)
CZ (1) CZ296994B6 (cs)
DE (2) DE19951005A1 (cs)
WO (1) WO2001029409A1 (cs)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030089802A1 (en) * 2000-01-20 2003-05-15 Bernd Mahr Injection device and method for injecting a fluid
DE10158951A1 (de) * 2001-12-03 2003-06-12 Daimler Chrysler Ag Mit Druckübersetzung arbeitendes Einspritzsystem
GB2394001B (en) * 2001-12-03 2004-06-16 Daimler Chrysler Ag Injection system operating with pressure intensification
DE10213659A1 (de) * 2002-03-27 2003-10-16 Bosch Gmbh Robert Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
US7252072B2 (en) * 2003-03-12 2007-08-07 Cummins Inc. Methods and systems of diagnosing fuel injection system error
DE102004057610A1 (de) * 2004-11-29 2006-06-01 Fev Motorentechnik Gmbh Kraftstoff-Injektor
US20060202053A1 (en) * 2005-03-09 2006-09-14 Gibson Dennis H Control valve assembly and fuel injector using same
CN104879258A (zh) * 2015-03-27 2015-09-02 中国北方发动机研究所(天津) 一种液压放大式超高压燃油供给装置
CN109869251A (zh) * 2019-02-28 2019-06-11 一汽解放汽车有限公司 一种液力耦合喷油器

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2558789A1 (de) 1975-12-24 1977-07-14 Bosch Gmbh Robert Hochdruck-kraftstoffeinspritzeinrichtung fuer dieselmotoren
GB2009842B (en) 1977-12-09 1982-03-03 Lucas Industries Ltd Fuel injection system
JPH071623B2 (ja) * 1987-06-30 1995-01-11 九州日立マクセル株式会社 デイスククリ−ナ
JPS6424778A (en) * 1987-07-22 1989-01-26 Brother Ind Ltd Input device
JPH03260369A (ja) * 1990-03-09 1991-11-20 Isuzu Motors Ltd 蓄圧式燃料噴射装置
CA2098192C (en) * 1991-10-11 2004-11-16 Thomas G. Ausman Damped actuator and valve assembly for an electronically-controlled injection
JP2885076B2 (ja) * 1994-07-08 1999-04-19 三菱自動車工業株式会社 蓄圧式燃料噴射装置
US5720261A (en) 1994-12-01 1998-02-24 Oded E. Sturman Valve controller systems and methods and fuel injection systems utilizing the same
US5632444A (en) * 1995-04-13 1997-05-27 Caterpillar Inc. Fuel injection rate shaping apparatus for a unit injector
US5732679A (en) * 1995-04-27 1998-03-31 Isuzu Motors Limited Accumulator-type fuel injection system
US5779149A (en) 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
US5826561A (en) * 1996-12-10 1998-10-27 Caterpillar Inc. Method and apparatus for injecting fuel using control fluid to control the injection's pressure and time
DE19742320A1 (de) * 1997-09-25 1999-04-01 Bosch Gmbh Robert Kraftstoffeinspritzventil
US5967413A (en) * 1998-02-11 1999-10-19 Caterpillar Inc. Damped solenoid actuated valve and fuel injector using same
US5964406A (en) 1998-05-28 1999-10-12 Caterpillar Inc. Valve area scheduling in a double acting piston for a hydraulically-actuated fuel injector

Also Published As

Publication number Publication date
DE50009990D1 (de) 2005-05-12
ATE292753T1 (de) 2005-04-15
JP2003512564A (ja) 2003-04-02
CN1158460C (zh) 2004-07-21
CN1327512A (zh) 2001-12-19
CZ296994B6 (cs) 2006-08-16
US6626369B1 (en) 2003-09-30
EP1144859A1 (de) 2001-10-17
CZ20012236A3 (cs) 2002-06-12
DE19951005A1 (de) 2001-04-26
WO2001029409A1 (de) 2001-04-26

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