EP1259728B1 - Dispositif d'injection et procede d'injection d'un fluide - Google Patents

Dispositif d'injection et procede d'injection d'un fluide Download PDF

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Publication number
EP1259728B1
EP1259728B1 EP01913657A EP01913657A EP1259728B1 EP 1259728 B1 EP1259728 B1 EP 1259728B1 EP 01913657 A EP01913657 A EP 01913657A EP 01913657 A EP01913657 A EP 01913657A EP 1259728 B1 EP1259728 B1 EP 1259728B1
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EP
European Patent Office
Prior art keywords
control valve
pressure
switching state
control
injection nozzle
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
EP01913657A
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German (de)
English (en)
Other versions
EP1259728A2 (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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1259728A2 publication Critical patent/EP1259728A2/fr
Application granted granted Critical
Publication of EP1259728B1 publication Critical patent/EP1259728B1/fr
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
    • F02M45/08—Injectors 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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

Definitions

  • the invention relates to an injection device with a control valve, an actuating element for actuating the control valve and an injection nozzle, which is controllable by the control valve via pressure build-up or pressure reduction in a control chamber, wherein the control valve has at least two switching states and in a first switching state of the control valve first pressure in the control chamber adjusts, wherein the injection nozzle is closed, and in a second switching state of the control valve, a second pressure in the control chamber adjusts, in which the injection nozzle is opened.
  • the invention further relates to a method for injecting fluid in which an actuating element is electrically actuated, the actuating element actuates a control valve, by the actuation of the control valve, a pressure in a control chamber is built up or reduced and opens the injector depending on the pressure in the control chamber or closes.
  • a generic device and a generic method are known and are preferred in storage injection systems ("Common rail") used.
  • Common rail In accumulator injection, pressure generation and injection are decoupled.
  • the injection pressure is generated independently of the engine speed and the injection quantity and is ready for injection in the "rail" (fuel accumulator).
  • Injection time and injection quantity are calculated in an electronic control unit and implemented by the injector on each engine cylinder via a controlled actuator.
  • solenoid valves and piezo actuators are generally used.
  • the injector can thus be supplied practically continuously with the pressure from the common rail of, for example, 1000 to 2000 bar.
  • This high pressure of the fluid is then used on the one hand to make an injection with high injection pressure, with a high pressure has a positive influence on the pollutant emissions and fuel consumption.
  • the fluid is also used for the stroke-controlled operation of the system.
  • the pressure chamber is the injector, inter alia, via the leadership of the push rod of the injection nozzle with the preferably directly adjacent to the push rod control chamber of the injector in connection.
  • the pressure in the control chamber degraded to relieve the push rod and allow opening of the injector, there is a large pressure difference between the control chamber, which is for discharge with a leakage system in communication, and the pressure chamber of the injector, in which the pressure of the common rail is present.
  • the pressure chamber of the injection nozzle in the control room and ultimately in the leak system.
  • the guides of the push rod act like an inlet throttle (Z throttle), which is an undesirable side effect in the pressure-relieved state of the control chamber.
  • throttles both inlet throttles and outlet throttles
  • An injection device according to the preamble of claim 1 is known from WO-A-99/15783.
  • the injector according to claim 1 of the invention builds on the prior art, characterized in that the control valve has at least a third switching state in which a third pressure in the control chamber adjusts, which is between the first pressure and the second pressure and wherein the injection nozzle is open.
  • the disadvantages of the prior art is counteracted. If the control chamber is depressurized by the actuation of the control valve, there is a high pressure difference between the control chamber and the pressure chamber of the injection nozzle. This is desirable on the one hand, so that the injection nozzle opens quickly, on the other hand, it brings with it the disadvantage that large amounts of fuel from the pressure chamber on the leadership of the push rod of the injector into the control chamber and ultimately overflow into the leak system.
  • the actuator is a piezoelectric actuator, which undergoes a change in length by electrical control.
  • Piezo actuators have proven themselves when used in injection devices, in particular because of their small size and reliable operation.
  • the use of piezoelectric actuators is particularly useful since their change in length can be easily influenced by the parameters of the electrical control (for example voltage, pulse duration).
  • control valve has a fourth switching state, in which a pressure is established in the control chamber, where the injector is closed. This may facilitate the cyclical operation of the control valve, particularly with regard to injection progression molding and pilot injection.
  • control chamber is partially bounded by an end face of a push rod of the injection nozzle.
  • the control chamber thus adjoins directly to the push rod, which favors the passage of fluid from the pressure chamber into the control chamber at the present pressure difference.
  • the reduction of the pressure difference thus has a particularly strong effect in such a system.
  • the push rod is acted upon by elastic means with force.
  • elastic means preferably a coil spring, securely hold the injector in a defined state.
  • control valve is in the first switching state in a first valve seat, so that the control chamber is separated from a leakage system, that the control valve is not in a valve seat in the second switching state, so that the Control chamber is connected to a leakage system via a first flow cross section and that the control valve is not in a valve seat in the third switching state, so that the control chamber is connected to a leakage system via a second flow cross section, wherein the first flow cross section is greater than the second flow cross section.
  • the first flow cross section the maximum possible flow cross-section of the control valve, that is, the control valve is fully open.
  • the second flow cross section is then continuously adjustable between the closed state of the control valve (flow cross section 0) and the fully open state with maximum flow cross section.
  • the correct pressure build-up in the second switching state of the control valve can therefore be determined by the characteristic of the control valve.
  • control valve is in a fourth switching state in a second valve seat, so that the control chamber is separated from a leakage system.
  • the pressure build-up in the control chamber for closing the injector is thus also in this variant by closing the control valve, but via a second valve seat.
  • opening and subsequent closing of the injection nozzle can thus be effected by an exclusive expansion of the actuating element.
  • a subsequent (partial) cycle then takes place by an exclusive length reduction.
  • the injection pressure is generated by a common rail.
  • the invention is useful.
  • the high pressure in the pressure chamber of the injection nozzle entails a high pressure difference between the pressure chamber and the control chamber. A reduction in this pressure difference due to a change in the pressure in the control chamber can at least partially eliminate the disadvantages due to excessive leakage quantities occurring.
  • the invention is based on claim 9 on the generic Vefahren characterized in that by the driving of the actuating element the control valve is first brought from a first switching state to a second switching state of at least three switching states, whereby the pressure in the control chamber is reduced and the injection nozzle opens, that the control element is brought into a third switching state of at least three switching states by further driving the actuator whereby a pressure in the control chamber is established and the injection nozzle remains in the open state and that the control valve is brought into a further switching state by further actuation of the actuating element in which a pressure in the control chamber is further developed, whereby the injection nozzle closes.
  • control valve is in the first switching state in a first valve seat and that the further switching state corresponds to the first switching state.
  • the control valve thus returns to the end of the injection process in its initial position in the first valve seat.
  • control valve is preferably located in a second valve seat.
  • control chamber in the first switching state of the control valve and the further switching state of the control valve, the control chamber is separated from a leakage system and that in the second switching state of the control valve and the third switching state of the control valve, the control chamber is connected to the leak system.
  • the pressure relief of the control chamber thus takes place through the connection of the control chamber with a leak system, while the pressure build-up takes place by a decoupling of the control chamber of the leak system.
  • the flow cross-section through the control valve in the second switching state of the control valve is greater than in the third switching state of the control valve.
  • the variable pressure setting in the control chamber is thus set via the flow cross section of the control valve.
  • the invention is based on the surprising finding that the leakage quantity of an injection system can be reduced by changing the pressure in the control chamber during the opening phase of the injection nozzle. It has been recognized that the pressure in the control chamber can be substantially equalized to the common rail pressure in the pressure chamber of the injection nozzle, so that on the one hand closing the injector does not yet take place, but on the other hand, a much lower flow of fluid the pressure chamber is present in the control room.
  • a control valve 2 can be actuated by an actuating element, not shown, which is arranged above the control valve 2.
  • the control valve 2 has a first valve seat 4 and a second valve seat 6.
  • the control valve 2 communicates with a control chamber 8, which is partially bounded by the push rod 10 of an injection nozzle.
  • the push rod 10 is further acted upon by a spring 12 with force to give the injector a defined closed position.
  • the control valve 2 is in its first valve seat 4, so that the control chamber 8 is separated from a schematically indicated by a line leakage system 14.
  • control chamber 8 Since the control chamber 8 communicates with the common rail 16, which is likewise indicated schematically by a line, the common rail pressure in the control space 8 can form in the illustrated state of the control valve 2. Consequently, the push rod 10 and thus the The injector is pushed down, keeping the injector in a closed state. Now leaves the control valve 2 by an actuation by the actuator its first valve seat 4, the control chamber 8 is relieved. Consequently, the push rod 10 of the injection nozzle can move upwards. Therefore, the injector opens.
  • FIG. 2 The lifting and pressure conditions in the injection system according to the invention are explained in more detail with reference to FIG 2.
  • the stroke of the control valve H STV is plotted against time t.
  • the nozzle stroke H D is also plotted against the time t.
  • the pressure in the control space p STR is plotted against the time t.
  • the three diagrams (a), (b) and (c) are arranged one above the other so that their time axes t correspond.
  • the control valve Before time t 1 , the control valve is in its seat. The stroke of the control valve is zero. Consequently, a high pressure builds up in the control space, which results in the nozzle lift being zero as well. At time t 1 , the control valve is now actuated, so that its stroke is different from zero. Accordingly, the control room is relieved. After a certain time delay, the nozzle also opens. At time t 2 , the nozzle is in its fully open state, and there is a considerable relief of the control chamber.

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)
  • Lift Valve (AREA)
  • Control Of Fluid Pressure (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (13)

  1. Dispositif d'injection avec une soupape de commande (2), un élément de régulation pour l'actionnement de la soupape de commande (2), un injecteur qui est commandé par la soupape de commande (2) au moyen de l'élévation de la pression et de la diminution de la pression dans une chambre de commande (8), dans lequel la soupape de commande (2) possède au moins deux états de commutation et, dans un premier état de commutation de la soupape de commande (2), il s'établit dans la chambre de commande (8) une première pression, à laquelle l'injecteur est fermé et, dans un deuxième état de commutation de la soupape de commande (2), il s'établit dans la chambre de commande (8) une deuxième pression, à laquelle l'injecteur est ouvert,
    caractérisé en ce que
    la soupape de commande (2) possède, au moyen d'une commande appropriée de l'élément de régulation, au moins un troisième état de commutation, dans lequel il s'établit dans la chambre de commande (8) une troisième pression, qui se situe entre la première pression et la deuxième pression, et à laquelle l'injecteur est ouvert.
  2. Dispositif d'injection selon la revendication 1,
    caractérisé en ce que
    l'élément de régulation est un activateur piézoélectrique qui subit une variation de longueur sous l'effet d'une commande électrique.
  3. Dispositif d'injection selon la revendication 1 ou 2,
    caractérisé en ce que
    la soupape de commande (2) possède un quatrième état de commutation dans lequel il s'établit dans la chambre de commande (8) une pression à laquelle l'injecteur est fermé.
  4. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la chambre de commande (8) est limitée en partie par une surface frontale d'une tige de pression (10) de l'injecteur.
  5. Dispositif d'injection selon la revendication 4,
    caractérisé en ce que
    la tige de pression (10) de l'injecteur est soumise à une force par des moyens élastiques.
  6. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la soupape de commande (2), dans le premier état de commutation, se trouve dans un premier siège de soupape (4), de sorte que la chambre de commande (8) est séparée d'un système de fuite (14), la soupape de commande (2), dans le deuxième état de commutation, ne se trouve pas dans un siège de soupape (4, 6), de sorte que la chambre de commande est reliée à un système de fuite (14) par l'intermédiaire d'une première section transversale d'écoulement, et la soupape de commande (2), dans le troisième état de commutation, ne se trouve pas dans un siège de soupape (4, 6), de sorte que la chambre de commande (8) est reliée à un système de fuite (14) par l'intermédiaire d'une deuxième section transversale d'écoulement, la première section transversale d'écoulement étant plus grande que la deuxième.
  7. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la soupape de commande (2), dans un quatrième état de commutation, se trouve dans un deuxième siège de soupape (6), de sorte que la chambre de commande (8) est séparée d'un système de fuite (14).
  8. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la pression d'injection est produite par un rail commun (16).
  9. Procédé d'injection de fluide, selon lequel un élément de régulation est commandé électriquement, l'élément de régulation actionne une soupape de commande (2), l'actionnement de la soupape de commande (2) établit ou diminue une pression dans une chambre de commande (8) et l'injecteur s'ouvre ou se ferme en fonction de la pression dans la chambre de commande (8),
    caractérisé en ce que
    par la commande de l'élément de régulation, la soupape de commande (2) est tout d'abord amenée d'un premier état de commutation dans un deuxième état de commutation d'au moins trois états de commutation, de sorte que la pression dans la chambre de commande (8) diminue et l'injecteur s'ouvre, par la poursuite de la commande de l'élément de régulation, la soupape de commande (2) est amenée dans un troisième état de commutation d'au moins trois états de commutation, de sorte qu'une pression s'établit dans la chambre de commande (8) et l'injecteur reste dans l'état ouvert, et par la poursuite de la commande de l'élément de régulation, la soupape de commande (2) est amenée dans un autre état de commutation, dans lequel une pression continue à s'établir dans la chambre de commande (8), de sorte que l'injecteur se ferme.
  10. Procédé selon la revendication 9,
    caractérisé en ce que
    la soupape de commande (2) dans le premier état de commutation se trouve dans un premier siège de soupape (4) et l'autre état de commutation correspond au premier état de commutation.
  11. Procédé selon la revendication 9,
    caractérisé en ce que
    la soupape de commande (2), dans l'autre état de commutation, se trouve dans un deuxième siège de soupape (6).
  12. Procédé selon l'une quelconque des revendications 9 à 11,
    caractérisé en ce que
    dans le premier état de commutation de la soupape de commande (2) et l'autre état de commutation de la soupape de commande (2), la chambre de commande (8) est séparée d'un système de fuite (14) et dans le deuxième état de commutation de la soupape de commande (2) et le troisième état de commutation de la soupape de commande (2), la chambre de commande (8) est reliée au système de fuite (14).
  13. Procédé selon l'une quelconque des revendications 9 à 12,
    caractérisé en ce que
    la section transversale d'écoulement à travers la soupape de commande (2) est, dans le deuxième état de commutation de la soupape de commande (2), plus grand que dans le troisième état de commutation de la soupape de commande (2).
EP01913657A 2000-02-18 2001-02-16 Dispositif d'injection et procede d'injection d'un fluide Expired - Lifetime EP1259728B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006786 2000-02-18
DE10006786A DE10006786A1 (de) 2000-02-18 2000-02-18 Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
PCT/DE2001/000585 WO2001061180A2 (fr) 2000-02-18 2001-02-16 Dispositif d'injection et procede d'injection d'un fluide

Publications (2)

Publication Number Publication Date
EP1259728A2 EP1259728A2 (fr) 2002-11-27
EP1259728B1 true EP1259728B1 (fr) 2006-01-18

Family

ID=7631032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01913657A Expired - Lifetime EP1259728B1 (fr) 2000-02-18 2001-02-16 Dispositif d'injection et procede d'injection d'un fluide

Country Status (8)

Country Link
US (1) US20030141389A1 (fr)
EP (1) EP1259728B1 (fr)
JP (1) JP2003522904A (fr)
CN (1) CN1404550A (fr)
AT (1) ATE316204T1 (fr)
CZ (1) CZ20022780A3 (fr)
DE (2) DE10006786A1 (fr)
WO (1) WO2001061180A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10335211A1 (de) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE102005059169A1 (de) * 2005-12-12 2007-06-14 Robert Bosch Gmbh Kraftstoffinjektor mit direkt betätigbarem Einspritzventilglied
EP2816212A1 (fr) * 2013-06-21 2014-12-24 Continental Automotive GmbH Procédé et dispositif de commande d'un injecteur

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529630B1 (fr) * 1991-08-30 1996-03-27 Nippondenso Co., Ltd. Système d'injection de carburant pour moteur à combustion interne
US5463996A (en) * 1994-07-29 1995-11-07 Caterpillar Inc. Hydraulically-actuated fluid injector having pre-injection pressurizable fluid storage chamber and direct-operated check
US5720318A (en) * 1995-05-26 1998-02-24 Caterpillar Inc. Solenoid actuated miniservo spool valve
DE19624001A1 (de) * 1996-06-15 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
US5860597A (en) * 1997-03-24 1999-01-19 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
DE19732802A1 (de) * 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19742073A1 (de) * 1997-09-24 1999-03-25 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19752851C1 (de) * 1997-11-28 1998-12-17 Siemens Ag Hydraulisches Absteuerventil

Also Published As

Publication number Publication date
ATE316204T1 (de) 2006-02-15
DE10006786A1 (de) 2001-08-30
WO2001061180A3 (fr) 2002-02-14
JP2003522904A (ja) 2003-07-29
CZ20022780A3 (en) 2004-04-14
EP1259728A2 (fr) 2002-11-27
WO2001061180A2 (fr) 2001-08-23
US20030141389A1 (en) 2003-07-31
DE50108750D1 (de) 2006-04-06
CN1404550A (zh) 2003-03-19

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