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WO2019223927A1 - Transporteur de fluide pour un fluide congelable, système de dosage ainsi que procédé pour faire fonctionner un transporteur de fluide. - Google Patents

Transporteur de fluide pour un fluide congelable, système de dosage ainsi que procédé pour faire fonctionner un transporteur de fluide. Download PDF

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Publication number
WO2019223927A1
WO2019223927A1 PCT/EP2019/058811 EP2019058811W WO2019223927A1 WO 2019223927 A1 WO2019223927 A1 WO 2019223927A1 EP 2019058811 W EP2019058811 W EP 2019058811W WO 2019223927 A1 WO2019223927 A1 WO 2019223927A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
valve
inlet valve
actuator
compression chamber
Prior art date
Application number
PCT/EP2019/058811
Other languages
German (de)
English (en)
Inventor
Yihao Zhu
Ralf Gragen
Mohan Kumar Kuppusamy
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 WO2019223927A1 publication Critical patent/WO2019223927A1/fr

Links

Classifications

    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
    • 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
    • F04B53/08—Cooling; Heating; Preventing freezing
    • 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
    • F04B53/108—Valves characterised by the material
    • F04B53/1082—Valves characterised by the material magnetic
    • 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
    • F04B53/109—Valves; Arrangement of valves inlet and outlet valve forming one unit
    • 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
    • F01N2610/01—Adding substances to exhaust gases the substance being catalytic material in liquid form
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • 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]

Definitions

  • the invention relates to a fluid delivery device for a free-flowing fluid, in particular for an aqueous urea solution for the aftertreatment of exhaust gases of an internal combustion engine, having the features of the preamble of claim 1.
  • the invention further relates to a metering system with such a fluid delivery device and a method for operating a corresponding fluid delivery device.
  • an aqueous urea solution is metered into an exhaust gas tract of the internal combustion engine.
  • the aqueous urea solution causes the formation of ammonia in the exhaust tract, which reacts with the nitrogen oxides contained in the exhaust gas in a downstream catalyst to harmless nitrogen and water. This process is also known as selective catalytic reduction.
  • a disadvantage of the aqueous urea solution is that it at
  • the published patent application DE 10 2007 057 446 A1 discloses a fluid delivery device for freezing liquids, such as, for example, a urea-water solution, which can be emptied by reversing the conveying direction.
  • the conveyor preferably a pump, has for this purpose a valve device with a first and a second check valve and a pneumatic or electric
  • controllable actuator on.
  • the reverse direction of the two check valves changes, so that the urea-water solution in the for
  • Main conveying direction is promoted reverse direction.
  • the present invention has for its object to provide a fluid delivery device for a freezable fluid, which is operable in a main conveying direction and in a direction opposite to the main conveying direction, to allow a back suction of fluid.
  • the fluid delivery device should be as simple as possible, in particular a separate valve for reversing the conveying direction should be saved. In addition, a variation of the flow rate should be possible.
  • the object is achieved by the fluid delivery device with the features of claim 1, the metering system with the features of claim 5 and the method for operating a fluid delivery device with the features of
  • the proposed fluid delivery device for a freezable fluid in particular for an aqueous urea solution for the aftertreatment of exhaust gases
  • Internal combustion engine comprising a compression chamber, an inlet valve for
  • the inlet valve and the outlet valve are electrically operated, de-energized
  • the inlet valve and the outlet valve in the delivery mode are not actuated by the applied fluid pressure, but actively activated.
  • the inlet valve and the outlet valve can thus targeted be opened or closed.
  • Exhaust valve opened, allowing fluid from the dosing module back into the
  • Compression space is sucked. Is the compression space with fluid from the
  • the exhaust valve is closed to then open the inlet valve.
  • the sucked-back fluid is then conveyed back into the fluid tank via the inlet valve.
  • the active control of the intake valve and the exhaust valve also has the advantage that in each case over the opening time, the opening duration and / or the closing time, the delivery rate of the fluid flow rate is adjustable. This means that the flow rate can be varied as needed.
  • the fluid delivery device can also be constructed comparatively simple.
  • this may be a simple pump, which itself knows only one conveying direction. Because if necessary, the reversal of the conveying direction is effected by means of the actively controllable valves, which is the inlet valve and the outlet valve. A separate valve for reversing the conveying direction is not required.
  • the drive of the pump can be carried out.
  • an actuator is assigned to the inlet valve and the outlet valve, so that both valves can be electrically actuated or controlled independently of one another.
  • the actuator may for example be designed as a magnetic actuator or piezoelectric actuator.
  • the electrical actuation by means of such an actuator has the advantage that the heat generated during operation of the actuator for heating the fluid can be used so that it thaws faster at low temperatures or does not even freeze.
  • the inlet valve and the outlet valve each have a reciprocating valve member which is biased by the spring force of a spring in the direction of a valve seat. Closing the inlet valve and the Exhaust valve can therefore be effected in a simple manner by means of the spring force of the respective spring.
  • the compression space preferably has a movable boundary wall which is formed by a reciprocating piston or an elastically deformable membrane. Accordingly, this may in particular be a piston pump or a diaphragm pump in the case of the fluid delivery device. These are particularly robust and compact at the same time.
  • the drive can be easily by a rotating drive or Hubmitel, for example a
  • Solenoids are effected.
  • a metering system for metering in a free-flowing fluid, in particular an aqueous urea solution, into a
  • Metering system comprises a fluid tank, a metering module and a fluid delivery device according to the invention.
  • the fluid delivery device is arranged between the fluid tank and the metering module in order to convey fluid from the fluid tank in the direction of the metering module during the delivery operation. With the help of the metering module, the fluid can then be metered into an exhaust tract of an internal combustion engine. When turned off
  • the fluid delivery device according to the invention can be used to empty the dosing system to prevent damage by ice pressure.
  • Fluid delivery device comprises a compression chamber, an inlet valve for connecting the compression chamber with a fluid tank and an outlet valve for connecting the compression chamber with a metering module.
  • the intake valve and the exhaust valve are electrically operated alternately in the conveying mode. This means that the inlet valve and the outlet valve are each actively activated in the delivery mode of the fluid delivery device, so that in particular the opening can be effected independently of the applied fluid pressure.
  • the inlet valve is initially actively activated or opened while the exhaust valve remains closed. In this way, in the suction operation of the fluid conveyor fluid from the fluid tank in the
  • the metering module is sucked back into the fluid tank, the intake valve and the exhaust valve are electrically operated in reverse order in alternation. Instead of the inlet valve, the outlet valve is initially activated or opened while the inlet valve remains closed. In this way, in the suction operation of the fluid conveyor fluid from the dosing back into the
  • the inlet valve and the check valve are each electrically actuated by an actuator, preferably a magnetic actuator or a piezoelectric actuator. Since each valve is assigned its own actuator, these can be controlled independently of each other. Furthermore, depending on the Bestrom ungsart - the effective direction of an actuator can be changed to assist the closing of a valve, while the other valve is opened via the other actuator.
  • the heat generated when using a magnetic actuator or a piezoelectric actuator can also be used to heat the fluid, so that it thaws at low temperatures or does not even freeze.
  • an actuator By energizing an actuator is preferably a reciprocating valve member of the intake valve or the exhaust valve against the spring force of a spring lifted from a valve seat.
  • the spring force of the spring can then be used to close the intake valve or exhaust valve.
  • the delivery rate is preferably set via the beginning, the duration and / or the end of the energization of the actuators, in particular of the actuator assigned to the inlet valve. For example, the opening of the intake valve may be delayed. Alternatively or additionally, the
  • Closing time of the intake valve are moved so that the intake valve is closed only after completion of the suction phase. That way, one becomes
  • the actuators are preferably energized offset in time from the reversal of the direction of movement of the compression space delimiting a movable boundary wall.
  • the direction of movement of the boundary wall determines whether the fluid delivery device is in the suction phase or in the delivery phase. In the suction phase, the boundary wall performs a movement which leads to an increase in the volume of the compression space. In the conveying phase, the boundary wall moves in the reverse direction and thus leads to a reduction of the volume. This changes the pressure conditions in the compression chamber. Because the inlet valve and the
  • Each exhaust valve are actively controlled, the opening and closing of the valves can be effected regardless of the position of the boundary wall and thus regardless of the prevailing fluid pressure in the compression chamber. Thus, it is possible to effect the opening and / or closing offset in time, in particular delayed.
  • the movable boundary wall can be formed by a reciprocating piston or by an elastically deformable membrane.
  • the opening of the valves that is offset in time from the reversal of the direction of movement of the membrane, in particular delayed, uses the fact that the membrane can initially reorient itself.
  • the movement of the boundary wall is preferably effected by a rotating drive or by lifting means, for example a lifting magnet.
  • the rotary drive may be a cam or eccentric drive via which a piston is moved back and forth.
  • This drive form has proven itself in fluid conveyors.
  • the reciprocating movements of a piston or a membrane can also be effected in a simple manner by means of a lifting magnet.
  • the drive types mentioned are robust and easy and inexpensive to implement.
  • 1 is a schematic representation of a dosing system
  • FIG. 2 shows a schematic representation of the fluid delivery device of the metering system of FIG. 1 during the suction phase during conveying in the main conveying direction, FIG.
  • FIG. 3 shows a schematic representation of the fluid delivery device of FIG. 2 during the delivery phase during conveying in the main conveying direction, FIG.
  • FIG. 1 illustrates the suction phase during conveying in a conveying direction opposite to the main conveying direction
  • FIG. 1 illustrates the conveying phase during conveying in a conveying direction opposite to the main conveying direction
  • FIG. 6 shows a section through the conveying device of the dosing system of FIG. 1
  • FIG. 7 shows a diagram for clarifying the control strategy of the valves.
  • the dosing system shown schematically in FIG. 1 comprises a fluid tank 4, in which a freezable fluid, in the present case an aqueous urea solution for
  • the fluid tank 4 is via a first
  • Fluid line 16 is connected to a fluid conveyor 1. Of the Fluid delivery device 1 leads a further fluid line 17 to a metering module 6, by means of which the fluid in an exhaust gas tract 18 of an internal combustion engine (not shown) can be metered.
  • the fluid delivery device 1 shown in FIG. 2 has a compression space 2 whose volume can be changed. With increasing volume, the fluid delivery device 1 is in a suction phase, with decreasing volume in a delivery phase.
  • Exhaust valve 5 is.
  • the outlet valve 5 opens and releases a valve seat 14, via which the fluid can flow out of the compression space 2 in the direction of the dosing module 6.
  • the dosing system When the internal combustion engine is switched off, the dosing system is emptied in order to prevent damage by ice pressure at low temperatures, since the aqueous urea solution freezes at temperatures below -11 ° C.
  • the emptying is with the help of
  • Inlet valve 3 and the exhaust valve 5 causes by these are actively driven in reverse order.
  • the outlet valve 5 is opened during a suction phase of the fluid delivery device 1, shown in FIG. 4, so that fluid flows back into the compression space 2 via the fluid line 17 and the valve seat 14. Opening the
  • Exhaust valve 5 is effected by energizing its associated actuator 8, which provides the required opening force.
  • the inlet valve 3 remains closed during this time.
  • the inlet valve 3 is opened when the outlet valve 5 is closed.
  • the actuator 7 associated with the inlet valve 3 is energized.
  • the inlet valve 3 is open, the fluid flows from the compression space 2 via the valve seat 13 and the fluid line 16 back into the fluid tank 4.
  • FIG. 1 A possible embodiment of the fluid delivery device 1 shown only schematically in FIGS. 1 to 5 can be seen in FIG.
  • the compression chamber 2 is the volume change by a movable
  • Limiting wall 15 limited, which in the present case is formed by an elastically deformable membrane.
  • the compression chamber 2 is on the one hand via an actively controllable inlet valve 3 and a fluid line 16 with a fluid tank 4 (not shown) connectable.
  • the compression chamber 2 via an actively controllable outlet valve 5 and a fluid line 17 with a metering module (not shown) connectable.
  • both valves 3, 5 each have an actuator 7, 8, which is embodied here as a magnetic actuator. When energizing an actuator 7, 8, a magnetic field is generated, the magnetic force acts on a reciprocating valve member 9, 10 in such a way that it against the
  • valve seat 13 Spring force of an associated spring 11, 12 is lifted from a valve seat 13, 14.
  • Valve seat side, the valve members 9, 10 are each provided with a sealing body 19, 20 made of an elastomeric material to optimize the sealing seat.
  • the drive strategy according to the invention will be explained again with reference to FIG.
  • the curve 21 shows the cyclical reciprocating movements of the
  • Compression space 2 delimiting boundary wall 15. While the curve 21 is increasing, the fluid delivery device 1 is in a suction phase, with decreasing curve 21 in a delivery phase. During a suction phase, the inlet valve 3 actively open while the exhaust valve 5 remains closed, so that the compression chamber 2 fills with fluid from the fluid tank 4. To open the
  • the outlet valve 5 is opened while the inlet valve 3 remains closed in order to supply the fluid from the compression space 2 to the dosing module 6.
  • the actuator 8 is energized, the energizing de actuator 8 only after the energization of the actuator 7 has been completed (see curve 23). This means that the actuators 7, 8 are each energized alternately and at time intervals.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un dispositif de transport de fluide (1) pour un fluide congelable, en particulier pour une solution aqueuse d'urée, pour le traitement ultérieur de gaz d'échappement d'un moteur à combustion interne, comprenant un espace de compression (2), une soupape d'admission (3) pour la connexion de l'espace de compression (2) à un réservoir de fluide (4) et une soupape d'échappement (5) pour la connexion de l'espace de compression (2) à un module de dosage (6). Selon l'invention, la soupape d'admission (3) et la soupape d'échappement (5) sont réalisées sous la forme de soupapes fermées sans courant actionnables électriquement. L'invention concerne en outre un système de dosage comprenant un tel transporteur ainsi qu'un procédé pour faire fonctionner un tel transporteur de fluide.
PCT/EP2019/058811 2018-05-23 2019-04-08 Transporteur de fluide pour un fluide congelable, système de dosage ainsi que procédé pour faire fonctionner un transporteur de fluide. WO2019223927A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018208112.3A DE102018208112A1 (de) 2018-05-23 2018-05-23 Fluidfördereinrichtung für ein gefrierfähiges Fluid, Dosiersystem sowie Verfahren zum Betreiben einer Fluidfördereinrichtung
DE102018208112.3 2018-05-23

Publications (1)

Publication Number Publication Date
WO2019223927A1 true WO2019223927A1 (fr) 2019-11-28

Family

ID=66182509

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/058811 WO2019223927A1 (fr) 2018-05-23 2019-04-08 Transporteur de fluide pour un fluide congelable, système de dosage ainsi que procédé pour faire fonctionner un transporteur de fluide.

Country Status (2)

Country Link
DE (1) DE102018208112A1 (fr)
WO (1) WO2019223927A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020211030A1 (de) 2020-09-02 2022-03-03 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben einer Pumpe und Fluid-Versorgungssystem mit einer solchen Pumpe
DE102021205735A1 (de) 2021-06-08 2022-12-08 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Ansteuern einer Pumpe, Verfahren zum Trainieren eines neurona-len Netzes und Fluid-Versorgungssystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785638A (en) * 1954-04-08 1957-03-19 Clifford B Moller Force pump for slurries
US5630709A (en) * 1996-02-09 1997-05-20 California Institute Of Technology Pump having pistons and valves made of electroactive actuators
DE102007057446A1 (de) 2007-11-29 2009-06-04 Robert Bosch Gmbh Fluidfördereinrichtung und Ventileinrichtung sowie Verfahren zum Betreiben einer Fluidfördereinrichtung
EP2523064A2 (fr) * 2011-05-13 2012-11-14 Fluke Corporation Appareil utilisant des soupapes à commande électronique
EP2631443A1 (fr) * 2010-10-22 2013-08-28 Bosch Corporation Dispositif d'alimentation en réducteur ainsi que procédé de commande de celui-ci, et dispositif d'épuration de gaz d'échappement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785638A (en) * 1954-04-08 1957-03-19 Clifford B Moller Force pump for slurries
US5630709A (en) * 1996-02-09 1997-05-20 California Institute Of Technology Pump having pistons and valves made of electroactive actuators
DE102007057446A1 (de) 2007-11-29 2009-06-04 Robert Bosch Gmbh Fluidfördereinrichtung und Ventileinrichtung sowie Verfahren zum Betreiben einer Fluidfördereinrichtung
EP2631443A1 (fr) * 2010-10-22 2013-08-28 Bosch Corporation Dispositif d'alimentation en réducteur ainsi que procédé de commande de celui-ci, et dispositif d'épuration de gaz d'échappement
EP2523064A2 (fr) * 2011-05-13 2012-11-14 Fluke Corporation Appareil utilisant des soupapes à commande électronique

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