WO2007033861A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
WO2007033861A1
WO2007033861A1 PCT/EP2006/065129 EP2006065129W WO2007033861A1 WO 2007033861 A1 WO2007033861 A1 WO 2007033861A1 EP 2006065129 W EP2006065129 W EP 2006065129W WO 2007033861 A1 WO2007033861 A1 WO 2007033861A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupler
space
actuator
pressure
fuel
Prior art date
Application number
PCT/EP2006/065129
Other languages
German (de)
English (en)
Inventor
Patrick Mattes
Wolfgang Stoecklein
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 WO2007033861A1 publication Critical patent/WO2007033861A1/fr

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
    • 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
    • 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
    • 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 a fuel injection device according to the preamble of patent claim 1.
  • the rail is at a certain distance from the injector.
  • pressure vibrations in the pipeline system are triggered by the injection.
  • a certain bias of the ceramic must be provided by eg mechanical biasing elements, so that during operation of the actuator (piezo actuator) no tensile forces in the ceramic can occur, which would lead to the destruction of the actuator.
  • switching valve For the clearance compensation in the switching chain actuator switching valve hydraulic couplers are used. These require provision of increased pressure in the low pressure circuit.
  • the switching valve influences the pressure in a control chamber and thereby the position of a valve piston (nozzle needle) of an injection nozzle and thus controls the injection of fuel into one during operation
  • the movable valve part of the switching valve opens against the rail pressure, that is, an I-valve (inwardly opening) is used.
  • the fuel injection device according to the invention for internal combustion engines with the characterizing features of claim 1 has the advantage that the bias of the piezoelectric actuator is at least partially made hydraulically. Only a reduced additional mechanical actuator bias is necessary. Thereby, e.g. simple coil springs can be used for the preload, in contrast to usual coil springs. This results in a simpler structure than before.
  • the return of the injector no longer needs to be pressurized to ensure refilling of the coupler.
  • the coupler is namely surrounded on its outside by the rail pressure and is filled by this quickly. This eliminates the usual return trail, and it is possible not particularly pressure-resistant return line.
  • the movable valve member is at least partially pressure balanced, the piezo-actuator is less heavily mechanically loaded, and it is possible to use a smaller piezoceramic.
  • Fig. 1 the fuel injection device according to the invention in longitudinal section
  • Fig. 2 shows a detail of a first modification of the device according to Fig. 1 in
  • FIG. 3 shows a detail of a further modification of the device of Figure 1 in the region of the movable valve member (valve ball) of the control valve.
  • Fig. 4 is an enlarged detail of Figure 1 illustrating a required dimensioning of the lower coupler piston compared to the valve seat.
  • FIG. 5 shows graphs as a function of time for the case of the first modification (FIG. 2) with reference to FIG. 4.
  • the figures are only for understanding important parts.
  • the Fign. 1 to 4 are longitudinal sections, partially broken.
  • the injection valve is shown partially schematized.
  • the Fig. 1 corresponding parts have an addition to the reference numeral.
  • a fuel injection device 1 a nozzle 2 (also known as injector), which is connected to a unit 3 and can be controlled by this.
  • the nozzle 2 corresponds largely known devices.
  • a valve piston (nozzle needle) 5 is controlled in its position by forces which are generated on its upper end face 7 by the pressure in a control chamber 9 and on a control surface 11.
  • the control chamber 9 is constantly filled with fuel under high pressure during operation via an inlet throttle 15 and then relieved of pressure via an outlet throttle 17 when the flow is released by a control valve 20.
  • the control valve 20 is located in the embodiment in the unit 3. To actuate it serve a piezo actuator 23 and a hydraulic coupler 25.
  • the actuator chamber 27 space which is pressure-tight.
  • the actuator chamber 27 has an inlet channel 29, the fuel is supplied under high pressure from a pressure accumulator or common rail (not shown) via a high pressure supply. Therefore In operation, the piezo actuator 23 and the hydraulic coupler 25 are surrounded by rail pressure.
  • the fuel for the injection is removed from this actuator chamber 27 via a high-pressure passage 31 and passed through a further high-pressure passage 33 to previously mentioned components of the nozzle 2.
  • the hydraulic coupler 25 is also surrounded by rail pressure.
  • the coupler 25 has a coupler body 35 with guide bores 36, 37 and two coupler pistons 38 slidably guided in the guide bores (connected to the piezo actuator 23) and 39 (for actuating the control valve 20).
  • the coupler pistons 38 and 39 are arranged linearly one behind the other with the interposition of a coupler space 41.
  • the guide bore 36 and the coupler piston 38 are each with its upper end to the actuator chamber 27 and therefore with the fuel under high pressure directly in communication.
  • a play between the guide bore 36 and the coupler piston 38 forms a guide gap and filling gap and allows a rapid filling of the coupler space 41 with fuel under high pressure.
  • the pressure in the coupler chamber 41 presses the coupler piston 38 against the piezo actuator 23 and biases it mechanically to pressure.
  • a spring 53 provided for biasing the actuator 23 can be made weaker than heretofore.
  • the control valve 20 opens with the rail pressure from the control chamber 9, it is therefore an A-valve, that is, outward opening.
  • the movable valve member 43 is in the example a ball which is directly actuated by the coupler piston via a fixed thereto, a lateral tolerance compensation enabling actuator plate 45 and an annular seat 47 (valve seat) of a nozzle on the top adjoining plate-shaped element 49 of the unit 3 interacts.
  • the seat 47 surrounds the upper end of a channel provided in the element 49, which is connected to the outlet throttle 17.
  • the area 50 downstream of the control valve 20, in which the valve member 43 and the lower end of the lower coupler piston 39 are located, is connected to a return 51.
  • the coupler body 35 is sealed at its lower end on the periphery, as indicated by "D" in Fig. 1, high-pressure-tight against the member 49 and the region 50.
  • a pressure level is set, which is (depending on the game of the coupler piston 38 and 39 in this receiving guide holes 36, 37 of the coupler body 35, and their guide lengths) between the rail pressure and return pressure level. Because of the game, the guide holes 36, 37 guide gaps. Through the games and the guide lengths, the said pressure level can be adjusted. Thus, at the appropriately set pressure level of the example on the lower coupler piston 39 in the idle state hydraulic forces, which keep the valve member 43 closed in the valve seat.
  • 0 $ the seat diameter is the diameter of the seat 47
  • 0 ⁇ diameter of the coupler piston 39
  • the leakage amount escaped from the coupler space 41 during the injection is quickly filled up after the injection by the high rail pressure via one (36) of the guide bores.
  • the control valve 20 is quasi pressure balanced in combination with the lower coupler piston 39. As a result, the size of the piezoceramic of the actuator 23 can be reduced compared to non-pressure compensated valves.
  • the properties of the fuel injection device 1 counteracting the above-mentioned vibrations can be varied by changing the available volume of the fuel chamber 27 for fuel.
  • An enlargement of the actuator chamber 27 can have a similar effect as a reduction of the accommodated in the actuator chamber 27 elements.
  • Fig. 2 shows a modified example. While in Fig. 1 leakage from the hydraulic coupler 25 enters the area 50 and thereby the pressure in the coupler chamber 41 decreases, Fig. 2 provides a remedy.
  • the coupler piston 39' In order to define the pressure in the hydraulic coupler 25 more accurately and to be independent of games of the coupler pistons 38, 39 'and thus tolerances, on the coupler piston 39' an additional extending at least a part of the circumference of the groove 55 together with a connecting channel 57 to substantially cylindrical outer side of the coupler body 35 'is provided.
  • the coupler space 41 is surrounded on all sides by rail pressure, and in the coupler space 41 inevitably sets a rail pressure level, regardless of the leakage occurring.
  • the coupler pressure pressure in the coupler space 41
  • the groove 55 is an annular groove in the example.
  • the groove may instead of in the coupler piston 39 'or additionally in the guide bore 37' a. It does not necessarily have to be completely circular.
  • the longitudinal displacement of the coupler piston is smaller than the width of the groove.
  • a spring element 61 in the example a helical spring, is provided on the lower coupler piston 39 "to ensure, for example, a defined position of the coupler piston 39" at system startup.

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)

Abstract

L'invention concerne un dispositif de carburant (1) de moteurs à combustion interne comprenant un actionneur piézo-électrique (23) destiné à déplacer un élément soupape mobile (43) d'une soupape de commande (20) qui, en fonction de sa position, bloque ou libère un écoulement d'un compartiment de commande (9), par l'intermédiaire d'un coupleur hydraulique (25). En mode marche, du carburant sous haute pression est cédé au compartiment de commande (9) par une valve d'admission (15), ce qui permet d'agir sur la pression dans le compartiment de commande (9) et de commencer et de terminer l'injection de carburant. Selon l'invention, l'actionneur piézo-électrique (23) et le coupleur (25) sont placés dans un compartiment (compartiment d'actionneur 27) rempli de carburant sous haute pression. Le compartiment d'actionneur présente un canal d'admission (29) à relier à un réservoir sous pression destiné au carburant sous haute pression. Le coupleur (25) présente un corps de couplage (35) ayant des orifices de guidage (36, 37) dans lesquels sont guidés par glissement deux pistons de coupleur (38, 39) qui délimitent un compartiment de coupleur (41). Au moins une fente de guidage servant à remplir le compartiment de coupleur (41) est déjà réglée dans les orifices de guidage (36, 37) et au moins un trou de guidage est en communication avec le compartiment d'actionneur (27).
PCT/EP2006/065129 2005-09-20 2006-08-08 Dispositif d'injection de carburant WO2007033861A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005044830.5 2005-09-20
DE200510044830 DE102005044830A1 (de) 2005-09-20 2005-09-20 Kraftstoffeinspritzvorrichtung

Publications (1)

Publication Number Publication Date
WO2007033861A1 true WO2007033861A1 (fr) 2007-03-29

Family

ID=37055985

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/065129 WO2007033861A1 (fr) 2005-09-20 2006-08-08 Dispositif d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102005044830A1 (fr)
WO (1) WO2007033861A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2587015A (en) * 2019-09-13 2021-03-17 Delphi Tech Ip Ltd Fuel injector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001023742A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Soupape pour commander le passage de fluides
DE10333690A1 (de) * 2003-07-24 2005-02-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102004002299A1 (de) * 2004-01-16 2005-08-04 Robert Bosch Gmbh Kraftstoffinjektor mit direkt angesteuertem Einspritzventilglied

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001023742A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Soupape pour commander le passage de fluides
DE10333690A1 (de) * 2003-07-24 2005-02-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102004002299A1 (de) * 2004-01-16 2005-08-04 Robert Bosch Gmbh Kraftstoffinjektor mit direkt angesteuertem Einspritzventilglied

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2587015A (en) * 2019-09-13 2021-03-17 Delphi Tech Ip Ltd Fuel injector
GB2587015B (en) * 2019-09-13 2021-12-08 Delphi Tech Ip Ltd Fuel injector

Also Published As

Publication number Publication date
DE102005044830A1 (de) 2007-03-29

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