EP1577541A1 - Soupape de commande d'un system d'injection - Google Patents

Soupape de commande d'un system d'injection Download PDF

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Publication number
EP1577541A1
EP1577541A1 EP04006632A EP04006632A EP1577541A1 EP 1577541 A1 EP1577541 A1 EP 1577541A1 EP 04006632 A EP04006632 A EP 04006632A EP 04006632 A EP04006632 A EP 04006632A EP 1577541 A1 EP1577541 A1 EP 1577541A1
Authority
EP
European Patent Office
Prior art keywords
control valve
valve body
valve
injection
switching
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.)
Withdrawn
Application number
EP04006632A
Other languages
German (de)
English (en)
Inventor
Timo Hochholzer
Marcel Schenk
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.)
Dualon International Holding SA
Original Assignee
Dualon International Holding SA
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 Dualon International Holding SA filed Critical Dualon International Holding SA
Priority to EP04006632A priority Critical patent/EP1577541A1/fr
Publication of EP1577541A1 publication Critical patent/EP1577541A1/fr
Withdrawn legal-status Critical Current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
    • 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 present invention relates to a control valve for an injection system, in particular for internal combustion engines.
  • an injection can be made with the valve or from the fuel storage, the fuel is directed to the return.
  • the disadvantage here is that the switching valve is located in the main injection flow and thus large Injection quantities can only be achieved by large switching strokes.
  • control valves for injectors in which by means of a solenoid a valve body is switched to overflow the movement of an injector needle one arranged adjacent to a control piston of an injection valve needle Control pressure chamber.
  • the control valve By means of the control valve, the pressure in the pressure chamber briefly reduced, so that the injection valve needle by means of the control valve in the open position is moved. It is between the high pressure port and the pressure space provided a throttle to a short-term pressure drop to ensure in the pressure chamber.
  • This is the opening movement and the closing movement is not freely adjustable and can be used for the combustion process not be optimized.
  • a control valve for an injection valve to create that is suitable for high pressure applications and in which the Shifting optimized as possible with regard to the switching time and the switching time can be adjusted and is also suitable for large injection quantities.
  • the control valve comprises a housing, on which one with a Einspitzventil and the control valve connected high pressure port provided is that of both the injector and the associated control valve with under supplied high pressure fluid.
  • the control valve includes a in arranged in the housing in an axial direction movable valve body, the in a first position, the high pressure port with a pressure chamber for control the movement of the injection valve and in a second position the pressure chamber connects to a diversion port. This does not require it in to provide a throttle for the connection between valve body and high-pressure connection, which extends the required switching time and thus the maximum Switching frequency limited.
  • valve body with low forces between two Positions is movable, in which the fluid optionally flows to the pressure chamber or flows from there, the required switching time can be kept very short. Accordingly, with the control valve then the injection valve needle of an injection valve be moved for an intermittent liquid injection.
  • the stand out the fluid acting on the valve body compressive forces in the axial direction in the essentially in the first and second positions.
  • the control valve is special good for high pressures of, for example, over 1500 bar used, otherwise at axial pressure forces through the fluid required for the switching process Shift forces can affect negatively.
  • control valve as a 3/2-way valve preferably surrounds connected to the high-pressure port annular annular channel the valve body and in a first position, the channel is arranged with a valve body Switching chamber in conjunction and in the second position is the channel of the Switching chamber separated. Further, the valve body in the first position a Disconnect the switching chamber from the Abêtan gleich and in the second position the Connect the switching chamber to the shut-off connection. During the first and the second position is then the switching chamber each with the pressure chamber for control connected to the movement of the injection valve.
  • the discharge line can on one side with the Abêtan gleich and on the other side with a Chamber adjacent to the end face of the valve body in communication.
  • a throttle for reducing the amount of flowing fluid during Opening and / or closing of the control valve may be provided. It can too a plurality of throttles provided on the valve body or on the channels to the valve body be.
  • the illustrated control valve is used to control an injection system for fuel injection in the combustion chamber of an internal combustion engine, wherein the Injection system, an injection valve 10 for the liquid injection, in particular for internal combustion engines such as diesel engines, where the fuel with injection pressures of e.g. more than 1,500 bar takes place to pollutant emissions to keep low.
  • the injection valve 10 comprises an axially movable injection valve needle, closed by means of one or more injection openings are.
  • the injection system comprises a control valve by means of the movement the injection valve needle is controlled.
  • the control valve comprises a magnet 1 controlled by electrical impulses, by means of which a biased by a spring 2 valve body 3 is movable.
  • a biased by a spring 2 valve body 3 is movable.
  • the Valve body 3 is formed substantially bolt-shaped and for a switching operation slightly movable in the axial direction.
  • the valve body 3 is within a housing 20 of the control valve received.
  • a high pressure port 6 is provided, on the one hand with the control valve and on the other hand communicates with the injection valve.
  • the injector is controllable by a valve needle to be intermittent Make liquid injection into a room of an internal combustion engine.
  • the valve needle is via a control piston 9 in the axial direction movable, whose movement is controlled by the control valve. The default is done by a nozzle needle spring 16th
  • a switching chamber 7 is formed on the valve body, which is annular a recess on the valve body 3 surrounds and outwardly from an inner wall of the housing 20 is limited.
  • the control valve connects the high pressure port 6 with a pressure space 23 which is adjacent to an end face of the control piston 9 for the injection valve is arranged.
  • the high pressure port 6 with a annular chamber 22 around the valve body 3 in conjunction and in the in FIG 1, a high-pressure switching side 5 is opened, i. there is a gap formed between the annular chamber 22 and the switching chamber 7.
  • the Switching chamber 7 is connected via a control line 8 to the pressure chamber 23 in connection.
  • a Abgresseite 4 is closed, wherein between the housing 20 and a widening of the valve body 3 is formed a corresponding valve seat is.
  • the Abgresseite 4 separates in this position, the switching chamber 7 of a Abêtan gleich 11, with a return line to the memory for the fluid can be connected.
  • the valve needle By connecting the high pressure port 6 with the Pressure chamber 23, the valve needle via the control piston 9 in the closed Position pressed.
  • control solenoid 1 To close the control valve, the control solenoid 1 is de-energized.
  • the Spring 2 moves the valve body 3 back to the starting position and the Pressure chamber 23 is again connected to the high pressure port 6 and through the corresponding pressure increase closes the valve needle again the injector 10th
  • the control valve shown operates on the 3/2-switching principle, each connects two out of three connections.
  • a hydraulic medium is preferably the fuel already available under high pressure, optionally also a control oil, such as engine lubricating oil used is.
  • valve body 3 In order to leave no pressure forces acting in the axial direction on the valve body 3, is in the valve body recessed a discharge line 13, which on a Side over transverse bores connected to the Abschan gleich 11 and on the other side with an adjacent to an end face of the valve body 3 arranged Chambers 24 is in communication. This affects the valve body 3 in both end positions on the axial end faces only compressive forces on prevail the Abberichtan gleich 11.
  • a throttle 12 is provided between switching chamber 7 and 4 Abgresseite. Depending on the throttle cross-section, this influences the speed of the opening movement the injection nozzle 10 and thus also the pressure increase in the combustion chamber at the beginning of combustion.
  • a switching operation graphically over time t and the volume Q of injected fluid over time being represented.
  • the switching operation 14 is the switching time when opening and Closing the injector minimized.
  • a throttle 12 it is possible to modify a flank of the injection course, for example when the Pressure increase at the beginning of combustion should be made somewhat slower. Then, a switching curve can be generated by a throttle 12, as he with the dashed line 15 is shown. Due to the design of the control valve and The geometry of one or more throttles can thus have an optimal injection behavior be generated.
  • valve body In the valve body is only a small in the first and second position Switching force required to move it. Because even with the high pressure forces of the fluid ensures that the compressive forces acting in the axial direction essentially cancel each other out. Due to the low switching forces and the short response time of the control valve are accurate and fast switching movements reaches the injection nozzle 10 and thus the combustion process, the Emission behavior and fuel consumption can be optimized. Furthermore, can even with an optimized switching position, the noise and NOx emissions of the internal combustion engine are minimized.
  • connection to the high pressure port in the second switching position separates, is compared with injectors, the control valve only one throttle between the pressure chamber and the high pressure port is provided, the efficiency is improved.
  • the throttle 12 may also have a different geometry as needed or several throttles may be formed on the valve body 3. Furthermore, it is possible to provide a throttle in the control line 8 if required.

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)
EP04006632A 2004-03-19 2004-03-19 Soupape de commande d'un system d'injection Withdrawn EP1577541A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04006632A EP1577541A1 (fr) 2004-03-19 2004-03-19 Soupape de commande d'un system d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04006632A EP1577541A1 (fr) 2004-03-19 2004-03-19 Soupape de commande d'un system d'injection

Publications (1)

Publication Number Publication Date
EP1577541A1 true EP1577541A1 (fr) 2005-09-21

Family

ID=34833654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04006632A Withdrawn EP1577541A1 (fr) 2004-03-19 2004-03-19 Soupape de commande d'un system d'injection

Country Status (1)

Country Link
EP (1) EP1577541A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10046875A1 (de) * 2000-09-20 2002-04-11 Orange Gmbh Steuerventil für Einspritzinjektoren
US20020079378A1 (en) * 2000-11-08 2002-06-27 Friedrich Boecking Pressure-controlled injector with serially connected control valves
US20020079386A1 (en) * 2000-11-10 2002-06-27 Bernhard Bonse Pressurized injector with optimized injection behavior throughout the cylinder path
US20020084347A1 (en) * 2000-12-07 2002-07-04 Robert Bosch Gmbh Pressure-controlled common rail fuel injector with graduated opening and closing behavior
US20020088435A1 (en) * 2000-12-20 2002-07-11 Robert Bosch Gmbh Fuel injection device
DE10164395A1 (de) * 2001-12-28 2003-07-17 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE10225157A1 (de) * 2002-06-06 2003-12-18 Bosch Gmbh Robert Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
EP1378659A2 (fr) * 2002-07-01 2004-01-07 Mitsubishi Heavy Industries, Ltd. Injecteur de combustible et moteur diesel comprenant celui-ci

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10046875A1 (de) * 2000-09-20 2002-04-11 Orange Gmbh Steuerventil für Einspritzinjektoren
US20020079378A1 (en) * 2000-11-08 2002-06-27 Friedrich Boecking Pressure-controlled injector with serially connected control valves
US20020079386A1 (en) * 2000-11-10 2002-06-27 Bernhard Bonse Pressurized injector with optimized injection behavior throughout the cylinder path
US20020084347A1 (en) * 2000-12-07 2002-07-04 Robert Bosch Gmbh Pressure-controlled common rail fuel injector with graduated opening and closing behavior
US20020088435A1 (en) * 2000-12-20 2002-07-11 Robert Bosch Gmbh Fuel injection device
DE10164395A1 (de) * 2001-12-28 2003-07-17 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE10225157A1 (de) * 2002-06-06 2003-12-18 Bosch Gmbh Robert Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
EP1378659A2 (fr) * 2002-07-01 2004-01-07 Mitsubishi Heavy Industries, Ltd. Injecteur de combustible et moteur diesel comprenant celui-ci

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