EP1045975A1 - Unite servant a commander l'etablissement de la pression dans une unite de pompage - Google Patents

Unite servant a commander l'etablissement de la pression dans une unite de pompage

Info

Publication number
EP1045975A1
EP1045975A1 EP99952396A EP99952396A EP1045975A1 EP 1045975 A1 EP1045975 A1 EP 1045975A1 EP 99952396 A EP99952396 A EP 99952396A EP 99952396 A EP99952396 A EP 99952396A EP 1045975 A1 EP1045975 A1 EP 1045975A1
Authority
EP
European Patent Office
Prior art keywords
valve
control valve
control
valve body
control unit
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
EP99952396A
Other languages
German (de)
English (en)
Other versions
EP1045975B1 (fr
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 EP1045975A1 publication Critical patent/EP1045975A1/fr
Application granted granted Critical
Publication of EP1045975B1 publication Critical patent/EP1045975B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially
    • 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
    • F02M45/06—Pumps peculiar thereto
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/17—Opening width of a throttling device
    • F04B2205/172—Opening width of a throttling device after the pump outlet

Definitions

  • Control unit for controlling the pressure build-up in a pump unit
  • the present invention relates to a control unit for controlling the pressure build-up by a pump unit in a system, the control unit having a control valve and a valve actuation unit connected to it, and the control valve being designed as an in-flow opening I-valve, which is one in one Has housing of the control unit axially displaceably mounted valve body which sits with a closed control valve from the inside on a valve seat of the control valve.
  • the present invention also relates to an injection system for supplying fuel to one
  • Combustion chamber of direct-injection internal combustion engines with a pump unit for building up an injection pressure and then for injecting the fuel into the combustion chamber via an injection nozzle.
  • the present invention also relates to a method for controlling the pressure build-up by means of a control unit with a control valve and a valve actuation unit connected thereto, the
  • Control valve is designed as an I valve opening inwards in the direction of flow, which is one in one Has housing of the control unit axially displaceably mounted valve body which sits with a closed control valve from the inside on a valve seat of the control valve.
  • Control units of this type are known from the prior art for controlling the pressure build-up of any pump units. They are used, for example, to control the fuel supply in a combustion chamber of direct-injection internal combustion engines.
  • the internal combustion engines have a pump unit for building up an injection pressure and then for injecting the fuel into the combustion chamber via an injection nozzle.
  • the internal combustion engine can be designed, for example, as a pump-nozzle unit (PDE) or as a pump-line-nozzle (PLD) system.
  • PDE pump-nozzle unit
  • PLD pump-line-nozzle
  • Valve actuation unit designed as an electromagnet that actuates the control valve.
  • the solenoid valve is open in the deenergized state. This provides a free flow from the pump unit to the low-pressure area of the injection system and thus allows the pump chamber to be filled with fuel during the suction stroke of the pump piston and backflow of the fuel during the delivery stroke. Activating the solenoid valve during the delivery stroke of the pump piston closes the latter
  • the control valve is downstream as a I-valve opening on the inside.
  • I-valves usually have a very steep flow curve for small strokes.
  • the course of the flow through a valve is plotted as a function of the stroke of the valve in a flow curve. Due to the steep course of the flow curve of I-valves with small valve strokes, even slight fluctuations in the valve stroke lead to relatively large fluctuations in the flow rate. In principle, a fluctuation in the flow rate with small strokes would have little effect on the total amount of the medium conveyed.
  • the flow rate through the valve should be as independent as possible of the valve stroke for small valve strokes and in which the flow curve should be as flat as possible for small strokes.
  • pre-injection is often carried out there, i.e. H. injected a small amount of fuel into the combustion chamber before the main injection.
  • the noise and exhaust gas behavior of the internal combustion engine can be influenced positively.
  • the amount of pre-injected fuel must be able to be accurately determined to determine the behavior of the
  • the invention proposes, starting from a control unit of the type mentioned at the outset, a control unit which is characterized by a throttle arrangement, by means of which the flow through the control valve is throttled when the control valve is open by a small stroke.
  • valve piston moves in the direction of the closed position of the control valve.
  • the control valve can be brought into a valve position opened by a small stroke.
  • the control valve is open by a small stroke, there is still a flow, but only a throttled flow, from the pump unit via the Valve seat of the control valve and given to the low pressure area of the system via the throttle arrangement.
  • Conditional filling of the pump chamber with the pumped medium during the suction stroke of the pump piston and backflow of the medium during the pumping stroke are thus possible.
  • a low pressure is built up in the high pressure area of the system.
  • the flow rate of the medium flowing through the control valve does not drop steeply during the closing process from a maximum value when the control valve is fully open to zero when the control valve is fully closed. Rather, when a small stroke is reached, an almost constant, small amount of the pumped medium flows through the control valve until the control valve is completely closed.
  • the course of the flow curve of the control valve for small strokes is advantageously very flat. This ensures that
  • the throttle arrangement is preferably integrated in the valve body. This has the advantage that it does not have to be controlled separately, but can be brought together with the valve body from an inactive position when the control valve is fully open to an active position when the control valve is open by a small stroke.
  • a further valve body is arranged on the outside of the valve body in the direction of flow, which is in a closed position for small strokes of the control valve and which has at least one throttle bore which is connected to an inlet and an outlet of the control valve when the control valve is open .
  • the further valve body is preferably axially displaceably mounted in the valve body.
  • valve body of the control valve With the control valve closed and with a small stroke of the control valve in the direction of flow, the valve body sits on another valve seat of the control valve from the inside. With the control valve fully open, i. H. with a large stroke, the valve body of the control valve is from the valve seat and the further valve body is
  • Throttle assembly lifted from the further valve seat.
  • the pumped medium can flow freely through the valve seat and the further valve seat from the pump unit to the low-pressure area of the system.
  • the valve body of the control valve With the control valve partially open, i.e. H. with a small stroke, the valve body of the control valve is still lifted from the valve seat, but the further valve body of the throttle arrangement is seated on the further valve seat.
  • the pumped medium can only flow throttled through the valve seat and the throttle bore of the other valve body. A small pressure is built up in the system.
  • the valve body of the control valve sits on the valve seat and the pumped medium is at the
  • Valve seat retained. Now a higher pressure is built up in the system.
  • the further valve body is formed by a spring element acting between the valve body and the further valve body when the control valve or is closed with a small stroke of the control valve pressed on the further valve seat.
  • the further valve body preferably has a stop which rests on the valve body when the control valve has a large stroke.
  • the distance between the stop and the valve body corresponds to the size of the small valve lift during which the throttle arrangement is active.
  • the invention proposes that the further valve body is formed on the outside of the valve body in the direction of flow and that the further valve body is sealed in a receiving bore with the control valve closed and with a small stroke of the control valve, from which the outlet leads out of the control valve.
  • the further valve body and the receiving bore form the further valve seat, which is closed during the small strokes of the control valve.
  • the pumped medium can only flow throttled through the valve seat and the throttle bore of the other valve body. This creates a low pressure in the system.
  • Valve body of the control valve on the valve seat and that conveyed medium is retained on the valve seat. A higher pressure is now built up in the system.
  • the present invention also relates to an injection system for supplying fuel to a combustion chamber of direct-injection internal combustion engines with a pump unit for building up an injection pressure and then for injecting the fuel into the combustion chamber via an injection nozzle, the injection system having means for introducing a small amount of fuel before the actual main injection pre-inject into the combustion chamber.
  • the invention proposes that the injection system have a control unit of the type mentioned above.
  • the present invention also relates to a method for controlling the pressure build-up by a pump unit in a system by means of a control unit, which has a control valve and a valve actuation unit connected to it, the control valve being designed as an I valve opening inwards in the flow direction, which has a valve body mounted axially displaceably in a housing of the control unit, which sits on a valve seat of the control valve from the inside when the control valve is closed, and wherein to build up a pressure in the system the valve body of the control valve from a position opened by a large stroke via one position by one small stroke open position is brought into a closed position.
  • the invention proposes that the flow through the control valve from the time at which the valve body is opened by a small stroke to the time at which the valve body is closed throttled by a throttle arrangement becomes.
  • the method for controlling the fuel supply into a combustion chamber of a direct-injection internal combustion engine with a pump unit is advantageously used to build up an injection pressure and then to inject the fuel into the combustion chamber via an injection nozzle.
  • the advantages of the invention are particularly evident when the method according to the invention is used in this way.
  • the method according to the invention makes it possible to control the fuel quantity of a pre-injection particularly precisely and reliably, since the flow rate through the control valve is almost independent of the valve lift of the control valve due to the flat course of the flow curve. With fluctuating small strokes, the flow rate is only subject to a slight fluctuation.
  • Fig. 1 shows a control valve of a control unit according to the invention in a first embodiment
  • Fig. 2 shows a control valve of an inventive
  • Control unit according to a second embodiment and Fig. 3 shows the course of the flow curve through a control valve of a control unit according to the invention.
  • the control unit is used to control the pressure build-up by a pump unit in any system. It has the control valve 1 and a valve actuation unit (not shown) connected to it.
  • the control valve 1 is designed as an I valve opening inwards in the direction of flow 14. It has a valve body 3 which is axially displaceably mounted in a housing 2 of the control unit and which, when the control valve 1 is closed, is seated on the inside on a valve seat 4 of the control valve 1.
  • the control valve 1 has a throttle arrangement 5, by means of which the flow through the control valve 1 is throttled when the control valve 1 is opened by a small stroke.
  • the throttle arrangement 5 is designed as a further valve body 6 integrated in the valve body 3.
  • the further valve body 6 is arranged on the outside of the valve body 3 in the direction of flow.
  • the further valve body 6 is at a small stroke of the control valve
  • the further valve body 6 is axially displaceably mounted in the valve body 3.
  • the further valve body 6 is seated with a closed control valve 1 and with a small stroke of the control valve 1 from the inside on a further valve seat 10 of the control valve 1.
  • both the valve seat 4 and the further valve seat 10 open. There is free flow from the pump unit to a low pressure area of the system, and thus it is possible to fill the pump chamber with the pumped medium during the suction stroke of the pump piston and backflow of the medium during the pumping stroke. No pressure is built up in the system.
  • valve seat 4 When the control valve 1 is opened by a small stroke, the valve seat 4 is still open, but the further valve seat 10 is closed, so that the pumped medium has to flow through the throttle bores 7 through the control valve 1. Due to this throttled flow through the control valve 1, a low pressure is built up in the high pressure area of the system.
  • the further valve body 10 is pressed onto the further valve seat 10 by a spring element 11 acting between the valve body 3 and the further valve body 6 when the control valve 1 is closed or with a small stroke of the control valve 1.
  • the further valve body 6 has a stop 12 which rests on the valve body 3 during a large stroke of the control valve 1.
  • the further valve seat 10 is particularly flat, so that the large flow rate Q (cf. FIG. 3) is reached as quickly as possible when the control valve 1 is opened after opening the further valve seat 10.
  • FIG 2 is a control valve 1 of an inventive Control unit shown according to a second embodiment.
  • the further valve body 6 is formed on the outside of the valve body 3 in the flow direction.
  • the further valve body 6 is received in a sealed manner in a receiving bore 13 when the control valve 1 is closed and with a small stroke of the control valve 1.
  • the drain 9 leads out of the control bore 1 out of the receiving bore 13.
  • the further valve body 6 forms the further valve seat 10 together with the edge of the receiving bore 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une unité servant à commander l'établissement de la pression à travers une unité de pompage dans un système. L'unité de commande comprend une soupape de commande (1) et une unité d'actionnement de soupape reliée à cette dernière. La soupape de commande (1) se présente sous la forme d'une soupape en I s'ouvrant vers l'intérieur dans le sens d'écoulement et présentant un corps de soupape (3) monté de manière à pouvoir coulisser axialement dans un boîtier (2) de l'unité de commande. Ce corps de soupape prend appui, de l'intérieur, sur un siège (4) de la soupape de commande (1) lorsque cette dernière est fermée. Afin de rendre la courbe de débit de la soupape de commande (1) la plus plane possible, pour de faibles levées (hklein) de la soupape de commande (1), il est prévu une unité de commande caractérisée par une unité d'étranglement (7) qui entraîne une réduction du débit à travers la soupape de commande (1) lorsque cette dernière est ouverte d'une faible levée (hklein).
EP99952396A 1998-08-18 1999-08-17 Unite servant a commander l'etablissement de la pression dans une unite de pompage Expired - Lifetime EP1045975B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19837332 1998-08-18
DE19837332A DE19837332A1 (de) 1998-08-18 1998-08-18 Steuereinheit zur Steuerung des Druckaufbaus in einer Pumpeneinheit
PCT/DE1999/002544 WO2000011339A1 (fr) 1998-08-18 1999-08-17 Unite servant a commander l'etablissement de la pression dans une unite de pompage

Publications (2)

Publication Number Publication Date
EP1045975A1 true EP1045975A1 (fr) 2000-10-25
EP1045975B1 EP1045975B1 (fr) 2004-05-19

Family

ID=7877840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99952396A Expired - Lifetime EP1045975B1 (fr) 1998-08-18 1999-08-17 Unite servant a commander l'etablissement de la pression dans une unite de pompage

Country Status (6)

Country Link
US (1) US6425539B1 (fr)
EP (1) EP1045975B1 (fr)
JP (1) JP2002523670A (fr)
KR (1) KR20010031172A (fr)
DE (2) DE19837332A1 (fr)
WO (1) WO2000011339A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2357812A (en) * 1999-12-28 2001-07-04 Bosch Gmbh Robert Pump/nozzle unit control valve with throttle for pre-injection

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10023960A1 (de) * 2000-05-16 2001-11-22 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine
ES2280318T3 (es) * 2000-07-18 2007-09-16 Delphi Technologies, Inc. Inyector de combustible.
JP2002098021A (ja) * 2000-09-25 2002-04-05 Toyota Motor Corp 複合電磁弁、高圧ポンプおよび高圧ポンプ制御装置
DE10059399B4 (de) * 2000-11-30 2005-05-12 Robert Bosch Gmbh Vorrichtung zur Verbesserung der Einspritzabfolge bei Kraftstoffeinspritzsystemen
US6390069B1 (en) * 2001-01-26 2002-05-21 Detroit Diesel Corporation Fuel injector assembly and internal combustion engine including same
EP1236885B1 (fr) * 2001-02-28 2005-03-30 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur à combustion interne
US7210640B2 (en) * 2001-11-30 2007-05-01 Caterpillar Inc Fuel injector spray alteration through a moveable tip sleeve
DE10209527A1 (de) 2002-03-04 2003-09-25 Bosch Gmbh Robert Einrichtung zur druckmodulierten Formung des Einspritzverlaufes
DE10210282A1 (de) * 2002-03-08 2003-09-25 Bosch Gmbh Robert Vorrichtung zum Einspritzen von Kraftstoff an stationären Verbrennungskraftmaschinen
DE102004022268A1 (de) * 2004-05-06 2005-12-01 Robert Bosch Gmbh Ansteuerverfahren zur Beeinflussung der Öffnungsgeschwindigkeit eines Steuerventiles an einem Kraftstoffinjektor

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US1663472A (en) * 1924-01-22 1928-03-20 Busch Sulzer Bros Diesel Engine Co Fuel-injection device for internal-combustion engines
DE2749378A1 (de) * 1977-11-04 1979-05-10 Bosch Gmbh Robert Kraftstoffeinspritzduese
JPS5882068A (ja) * 1981-11-09 1983-05-17 Nissan Motor Co Ltd 燃料噴射ノズル
JP2615174B2 (ja) * 1988-12-28 1997-05-28 株式会社ゼクセル 増圧式燃料噴射装置
FR2672366B1 (fr) * 1991-01-31 1993-08-27 Bendix Europ Services Tech Vis de purge pour circuit hydraulique.
DE4142940C2 (de) * 1991-12-24 1994-01-27 Bosch Gmbh Robert Elektrisch gesteuerte Pumpedüse
DE4238727C2 (de) * 1992-11-17 2001-09-20 Bosch Gmbh Robert Magnetventil
US5301714A (en) * 1993-03-01 1994-04-12 Johnson Keith E Multi-position valve apparatus having a return port
SE507374C3 (sv) * 1996-09-10 1998-06-29 Volvo Lastvagnar Ab Saett och anordning foer reglering av insprutningstrycket av flytande braensle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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See references of WO0011339A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2357812A (en) * 1999-12-28 2001-07-04 Bosch Gmbh Robert Pump/nozzle unit control valve with throttle for pre-injection
GB2357812B (en) * 1999-12-28 2002-03-13 Bosch Gmbh Robert Pump/nozzle unit with pre-injection

Also Published As

Publication number Publication date
EP1045975B1 (fr) 2004-05-19
DE19837332A1 (de) 2000-02-24
KR20010031172A (ko) 2001-04-16
WO2000011339A1 (fr) 2000-03-02
JP2002523670A (ja) 2002-07-30
DE59909524D1 (de) 2004-06-24
US6425539B1 (en) 2002-07-30

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