EP3011152A1 - Dispositif d'injection - Google Patents

Dispositif d'injection

Info

Publication number
EP3011152A1
EP3011152A1 EP14718986.4A EP14718986A EP3011152A1 EP 3011152 A1 EP3011152 A1 EP 3011152A1 EP 14718986 A EP14718986 A EP 14718986A EP 3011152 A1 EP3011152 A1 EP 3011152A1
Authority
EP
European Patent Office
Prior art keywords
piston
injection device
compression space
armature
compression
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Withdrawn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
EP14718986.4A
Other languages
German (de)
English (en)
Inventor
Rainer Haeberer
Thorsten Stoeberl
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 EP3011152A1 publication Critical patent/EP3011152A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an injection device, in particular an injection device for injecting a reducing agent into an exhaust gas line.
  • the pollutant NO x has to be reduced due to the stricter emission legislation.
  • One method which is preferably used is the so-called SCR method, in which NO x is reduced to N 2 and H 2 O with the aid of a liquid reducing agent, which in particular contains urea.
  • the reducing agent is thereby removed from an injection device, which is based on the pump / nozzle principle, from a tank and into the
  • Such an injection device is e.g. from EP 1878920 P1.
  • Such an injection device has a piston which is movable by an electromagnet so that it first compresses the reducing agent and injects into the exhaust gas line after opening an injection valve. Subsequently, the piston is moved by a spring back to its original position. During this return movement, liquid reducing agent is sucked into the compression space through a slit valve.
  • An injection device which is provided in particular for injecting a reducing agent into an exhaust gas line of an internal combustion engine, has a compression space whose volume can be varied by moving a piston.
  • the piston has a compression chamber-side region facing the compression chamber and an armature-side region facing away from the compression chamber.
  • the injector further includes an inlet valve having at least one open position where it provides fluid communication between the compression space and an external fluid source and at least one closed position where the inlet valve breaks fluid communication between the compression space and the external fluid source ,
  • the inlet valve is formed on the armature-side region of the piston facing away from the compression chamber.
  • the inlet valve is formed on the armature-side, facing away from the compression chamber region of the piston, it is easier to manufacture and more robust, especially compared to Kolbenfressern, as formed on the compression chamber inlet valves, as used in previously known injectors.
  • a fluid bore is formed in the piston that provides fluid communication between the compression space and the inlet valve.
  • a fluid connection between the inlet valve and the compression chamber can be created on manufacturing technology simple and robust way, which makes it possible to introduce fluid through the formed on the opposite region of the piston inlet valve in the compression chamber.
  • the compression space is formed in a sleeve and the inlet valve is formed by the cooperation of a portion of the sleeve with an armature-side portion of the piston. In this way, a very robust and easy to manufacture manufacturing inlet valve can be created.
  • the inlet valve is in particular by the inlet valve
  • the piston in its compression-chamber-side region in addition to a compression-chamber-side groove, which is in particular in fluid communication with the fluid bore.
  • fluid can be guided into the compression-chamber-side peripheral region of the piston in order to improve the lubrication of the piston and to optimize the tribological behavior of the piston.
  • At the armature-side region of the piston is a
  • Anchor plate is formed, which is attracted by an electromagnet, to move the piston.
  • the anchor plate at least one at least partially circumferential around the piston recess is formed in order to reduce the noise that occurs when striking the anchor plate against the sleeve.
  • the piston has at least one circumferential groove extending over at least half of the longitudinal extent of the piston. In this way, the contact area between the circumference of the piston and the sleeve surrounding the piston and thus also the friction between the piston and the sleeve can be further reduced.
  • the circumference of the piston may be crowned along its longitudinal extension so that the piston has a smaller diameter at its two longitudinal ends than in a central region between the two ends.
  • pressure fields are formed which center the piston in the center of the sleeve, thereby reducing the friction between the piston and the sleeve and further improving the tribological properties.
  • the injection device has a z. B. with an elastic element, in particular a spring, formed outlet valve, which allows fluid exiting the compression space, when the pressure of the fluid in the compression chamber exceeds a predetermined limit, which is defined in particular by the properties of the elastic element. In this way it is possible to inject the reducing agent with a defined, in particular by the properties of the elastic element predetermined pressure in the exhaust system.
  • Figure 1 is a schematic view of an injection system according to the invention for injecting a reducing agent in an exhaust line;
  • Figure 2 is a schematic sectional view of an inventive
  • FIG. 3 shows a first alternative embodiment of a piston with improved tribological properties
  • Figure 4 shows a second alternative embodiment of a piston with improved tribological properties.
  • FIG. 1 shows a schematic view of a device according to the invention for injecting a reducing agent 30, in particular an aqueous one
  • Urea solution which is stored in a tank 26, in an exhaust line 22 of an internal combustion engine, not shown in the figure 1, in particular a diesel engine.
  • the reducing agent 30 is removed from the tank 26 and from a
  • FIG. 2 shows a schematic sectional view through an injection device 20 according to the invention.
  • the injection device 20 has a sleeve 9 arranged in an outer housing 11, wherein a front exhaust gas side end 9a of the sleeve 9, which is shown at the top in FIG. 2, projects out of the housing 11.
  • a compression space 16 is formed in a front, exhaust gas side region of the sleeve 9, a compression space 16 is formed.
  • an outlet valve 12 is provided in the front end 9a of the sleeve 9, which opens to fluid from the compression chamber 16 through the outlet valve 12 in the not in the Figure 2 shown
  • a substantially cylindrically formed piston 1 is arranged which delimits the compression chamber 16 on its side remote from the exhaust gas line and which is movable parallel to its longitudinal direction, so that the volume of the compression chamber 16 is variable by moving the piston 1.
  • a longitudinal bore 4 is parallel to its longitudinal direction, in particular along its longitudinal axis A, wherein a first, compression chamber side opening 4a of the longitudinal bore 4 in the end face 1 a of the piston 1, which limits the compression space 16, is provided and a second, armature-side opening 4b of the longitudinal bore 4 via a transverse bore 3 in
  • Fluid communication with a circumferential groove 6 is formed on an armature side, facing away from the compression chamber 16 region of the piston 1, which is shown in the figure 2 below, is formed.
  • the longitudinal bore 4 in combination with the transverse bore 3 and the circumferential groove 6 creates a fluid connection between the compression space 16 and the armature-side environment of the
  • Piston 1 On the side facing away from the compression chamber 16 (shown below) side of the circumferential groove 6 of the piston 1 is formed with a circumferential collar 15 which has a larger diameter than the piston 1 on the compression chamber side (above) side of the circumferential groove 6.
  • the collar 15 is in mechanical operative connection with an armature 2, of an electrical
  • Spool 13 which is formed around the piston 1 and the surrounding sleeve 9, can be attracted to move the piston 1 in the direction of the compression chamber 16 and in this way to reduce the volume of the compression chamber 16.
  • the armature 2 is characterized by an elastic element, for. B. a coil spring 19, elastically supported on the surrounding the compression-space-side region of the piston 1 sleeve 9, and is at deactivated, i. not energized, coil 13 is pressed by the elastic member 19 in its initial position (in the illustration of Figure 2 down), so that the volume of the compression chamber 16 is maximum.
  • an elastic element for. B. a coil spring 19, elastically supported on the surrounding the compression-space-side region of the piston 1 sleeve 9, and is at deactivated, i. not energized, coil 13 is pressed by the elastic member 19 in its initial position (in the illustration of Figure 2 down), so that the volume of the compression chamber 16 is maximum.
  • the circumferential groove 6 is formed so that it is at least partially outside of the sleeve 9 in the direction of movement of the piston 1, when the armature 2 and the piston 1 with deactivated coil 13 in its (lower) starting position
  • suction position in which the volume of the compression space 16 is maximum.
  • this suction position of the piston 1 can therefore reducing agent, which has been promoted by the pump 24 shown in Figure 1 from the tank 26 in a piston 1 surrounding volume 10 within the housing 1 1, through the circumferential groove 6, the transverse bore 3 and Longitudinal bore 4, which in the
  • Pistons 1 are formed to flow into the compression chamber 16.
  • the injector 20 is activated by the coil 13 is energized.
  • the energized coil 13 pulls the armature 2, which is a magnetic
  • Material contains, magnetically and moves the armature 2 and connected to the armature 2 piston 1 in the direction of the compression chamber 16 (in the illustration of Figure 2 upward) in an injection position, so that the volume of the compression chamber 16 is reduced.
  • the outlet valve 12 opens and the fluid reducing agent flows through the open outlet valve 12 from the compression chamber 16 into the exhaust system 22 surrounding the outlet valve 12.
  • the outlet valve 12 can be in particular a nozzle be formed to achieve the finest possible distribution of the reducing agent 30 in the exhaust line 22.
  • the power supply to the coil 13 is interrupted, so that the coil 13 no longer magnetically attracts the armature 2, and the armature 2 and its associated piston 1 by the force of the elastic member 19 back into their (lower ) Home position (suction position).
  • the circumferential groove 6 emerges again from the sleeve 9, whereby on the circumferential groove 6, the transverse bore 3 and the longitudinal bore 6 again a fluid connection between the piston 1 surrounding the volume 10 in the housing 11 and the Compression chamber 16 is created. Due to the movement of the piston 1, the volume of the compression chamber 16 continues to increase and fluid flows through the restored fluid connection in the compression chamber 16. Once the compression chamber 16 is filled in this way again with fluid, by re-energizing the coil 13 another Injection process, as previously described, be performed.
  • a circumferential groove 14 is formed in the side facing away from the armature 2 end 15a of the collar 15 of the piston 1, which faces the armature-side end face 9b of the sleeve 9, a circumferential groove 14 is formed. Since the abutment of the collar 16 to the anchor-side end face 9b of the sleeve 9 is damped or buffered by fluid accumulating in the groove 14, the groove 14 causes the noise to be produced when the collar 15 hits the anchor-side end face 9b of the sleeve 9 is formed, is reduced. In the exemplary embodiment shown in FIG.
  • a second circumferential groove 5 is additionally formed in a compression-chamber-side region of the piston 1, which is also in fluid communication with the longitudinal bore 4 and allows fluid to flow out of the longitudinal bore 4 in FIG the space between the front, the compression space 16 facing region 1 b of the piston 1 and the piston 1 surrounding the sleeve 9 flows and acts there as a lubricant.
  • Figures 3 and 4 each show a possible alternative embodiment of a piston 1 with improved tribological properties.
  • the circumference of the piston 1 is additionally formed with a third circumferential groove 36 which extends between two projections 38 over most of the longitudinal extent of the piston 1.
  • the contact area between the circumference of the piston 1 and the surrounding the piston 1 sleeve 9 is reduced, whereby the friction between the piston 1 and the sleeve 9 is further reduced.
  • the third circumferential groove 36 may be connected via one or more, not shown in the figure 3, transverse bores with the longitudinal bore 4 in order to provide the area of the third circulation groove 36 with fluid as a lubricant.
  • the outer peripheral surface of the piston 1 is formed crowned, so that the piston 1 in its longitudinally central region 42 has a larger diameter than in the first and the second circumferential groove 6, 5 has adjacent regions 40 at the two longitudinal ends of the piston 1.
  • Sleeve 9 pressure fields, which center the piston 1 in the middle of the sleeve 9, so that the friction between the piston 1 and the surrounding sleeve 9 is further reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Dispositif d'injection (20), en particulier pour l'injection d'un agent réducteur (30) dans une ligne d'échappement (22), qui comporte une chambre de compression (16) dont le volume peut varier sous l'effet du déplacement d'un piston (1) comprenant une partie (1b) orientée vers la chambre de compression (16) et située du côté de ladite chambre et une partie (1c) opposée à la chambre de compression (16) et située du côté de l'induit, et une soupape d'admission (6, 8) présentant au moins une position ouverte dans laquelle ladite soupape établit une liaison fluidique entre la chambre de compression (16) et une source de fluide externe (24, 26), et au moins une position fermée dans laquelle ladite soupape coupe la liaison fluidique entre la chambre de compression (16) et la source de fluide externe (24, 26), la soupape d'admission (6, 8) étant formée dans la partie (1c) située côté induit du piston (1).
EP14718986.4A 2013-06-20 2014-04-23 Dispositif d'injection Withdrawn EP3011152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013211668.3A DE102013211668A1 (de) 2013-06-20 2013-06-20 Einspritzvorrichtung
PCT/EP2014/058201 WO2014202260A1 (fr) 2013-06-20 2014-04-23 Dispositif d'injection

Publications (1)

Publication Number Publication Date
EP3011152A1 true EP3011152A1 (fr) 2016-04-27

Family

ID=50543591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14718986.4A Withdrawn EP3011152A1 (fr) 2013-06-20 2014-04-23 Dispositif d'injection

Country Status (3)

Country Link
EP (1) EP3011152A1 (fr)
DE (1) DE102013211668A1 (fr)
WO (1) WO2014202260A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015211749A1 (de) 2015-06-24 2016-12-29 Robert Bosch Gmbh Einspritzvorrichtung für ein flüssiges Reduktionsmittel

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1301956B (de) * 1966-04-02 1969-08-28 Eberspaecher J Brennstoff-Kolbenpumpe
US4352645A (en) * 1978-07-18 1982-10-05 Sundstrand Corporation Solenoid pump adapted for noiseless operation
JPS5720832Y2 (fr) * 1979-02-19 1982-05-06
JPH08210248A (ja) * 1994-10-31 1996-08-20 Harry Ono 複式ピストン・ポンプ
ATE512300T1 (de) 2006-07-12 2011-06-15 Delphi Tech Holding Sarl Dosierpumpe für eines reduktionsmittels
GB2452955B (en) * 2007-09-20 2009-08-19 Scion Sprays Ltd Fuel injector
DE102010039084A1 (de) * 2010-08-09 2012-02-09 Robert Bosch Gmbh Ventilvorrichtung zum Einspritzen eines Reduktionsmittels in den Abgasstrang eines Kraftfahrzeuges
DE102012107983A1 (de) * 2011-08-29 2013-02-28 Jiming Lv Schwingkolbenpumpe
EP2584198A3 (fr) * 2011-10-21 2016-03-30 Continental Automotive GmbH Pompe de distribution d'un fluide

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2014202260A1 *

Also Published As

Publication number Publication date
WO2014202260A1 (fr) 2014-12-24
DE102013211668A1 (de) 2014-12-24

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