EP2809898A2 - Procédé permettant de faire fonctionner un dispositif de dosage - Google Patents

Procédé permettant de faire fonctionner un dispositif de dosage

Info

Publication number
EP2809898A2
EP2809898A2 EP13703009.4A EP13703009A EP2809898A2 EP 2809898 A2 EP2809898 A2 EP 2809898A2 EP 13703009 A EP13703009 A EP 13703009A EP 2809898 A2 EP2809898 A2 EP 2809898A2
Authority
EP
European Patent Office
Prior art keywords
pressure
metering
valve
pump
accumulator
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Withdrawn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
EP13703009.4A
Other languages
German (de)
English (en)
Inventor
Rolf BRÜCK
Jan Hodgson
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.)
Continental Automotive GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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 Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Publication of EP2809898A2 publication Critical patent/EP2809898A2/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2610/1446—Means for damping of pressure fluctuations in the delivery system, e.g. by puffer volumes or throttling
    • 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
    • F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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 a method for operating a metering device for providing a liquid additive.
  • the metering device can be used, for example, to supply a liquid additive into the exhaust gas treatment device, where it is used to clean the exhaust gases of a mobile internal combustion engine (in particular in a motor vehicle).
  • Exhaust treatment devices in which a liquid additive is supplied, are finding more and more widespread lately.
  • An exhaust gas purification process which is particularly frequently carried out in such exhaust gas treatment devices is the selective catalytic reduction (SCR) process, in which nitrogen oxide compounds in the exhaust gas are reduced with the aid of a reducing agent.
  • the reducing agent is supplied to the exhaust gas treatment device regularly in the form of a liquid additive.
  • liquid additive is urea-water solution.
  • a urea-water solution with a urea content of 32.5% is commercially available under the trade name AdBlue ® and widely used.
  • the urea-water solution is merely a reductant precursor and is exhausted externally (in a dedicated reactor) or converted to ammonia (the reducing agent) internally of the exhaust gas (in the exhaust treatment device under the influence of the exhaust gas).
  • Nitrogen oxide compounds in the exhaust gas are then reduced together with the ammonia in the presence of an SCR catalyst to harmless substances (water, CO2 and nitrogen).
  • an SCR catalyst to harmless substances (water, CO2 and nitrogen).
  • the metering device for providing a liquid additive should be as simple as possible, if possible long-term stability and maintenance-free as well as cost-effective. At the same time, it is desired that the metering accuracy of a metering device is particularly high. As a result, on the one hand, the amount of liquid additive necessary for the conversion of pollutant constituents in the exhaust gas can be set particularly precisely. In addition, it is possible to effectively avoid overdoses.
  • the invention relates to a method for operating a metering device for providing a liquid additive, in particular urea-water solution.
  • the metering device has at least the following:
  • At least one pump for conveying the additive from a tank to an accumulator
  • a metering valve which is adapted to provide metered in the accumulator additive present
  • the method comprises at least the following steps:
  • the metering device is particularly preferably used for metering a reducing agent (or a reducing agent precursor such as urea-water solution) as a liquid additive in an exhaust gas treatment device of an internal combustion engine.
  • the pump is preferably a diaphragm pump or a piston pump.
  • the delivery rate of the pump is preferably not regulated. This means that no electronic control or control is provided, with which the amount of additive pumped by the pump can be precisely determined.
  • the tank is preferably connected to the pump via a suction line, via which the pump can suck in liquid additive from the tank.
  • the pressure accumulator is preferably arranged in a flow direction of the liquid additive from the tank to the metering valve behind the pump. A pressure built up by the pump is present in the pressure accumulator.
  • the pressure accumulator may for example be designed as a flexible conduit which expands as soon as liquid additive is conveyed under pressure from the pump into the flexible conduit.
  • the metering valve is preferably an electrically controlled solenoid valve which can be opened and closed by the electric drive, wherein the opening time of the metering valve dictates the amount of liquid additive provided.
  • At the accumulator also adjoins a return valve.
  • the return valve is preferably connected via a return line back into the tank, so that in the pressure accumulator present liquid additive can be discharged back into the tank.
  • a motor controller sends out a signal that corresponds to a certain amount of liquid additive needed. This signal is detected or identified as Dosieran birthday.
  • a pressure which is so low that processing of the dosing request is not possible is preferably present in the pressure reservoir.
  • the pressure in the pressure accumulator during step a) is below 2 bar, more preferably below 1 bar and most preferably below 0.5 bar.
  • the pump is activated in order to build up a pressure in the accumulator, which is necessary for a suitable metering with the metering valve.
  • a diaphragm pump or a piston pump is preferably operated with between 2 and 10 pump strokes.
  • the number of pump strokes necessary to build up the necessary pressure in the accumulator depends on the flexibility of the accumulator and on the pressure difference between the pressure during step a) and the metering pressure (step b).
  • the more flexible the pressure accumulator the more liquid additive can be conveyed into the accumulator, so that the necessary pressure is built up.
  • the pressure built up by the activation of the pump in step b) is preferably between 3 and 10 bar, more preferably between 5 and 10 bar and most preferably between 6 and 8 bar.
  • the pressure built up by the pump in step b) is typically slightly above the metering pressure which is necessary to be able to accurately meter with the metering valve.
  • the pump is preferably unregulated. This means that the pump is not deactivated when a certain pressure is reached, but after an activation the pump initially continues to run, regardless of how high the pressure acting in the pressure accumulator is against the pump. In one embodiment variant of the described method, the pump stops its operation only when the pressure in the pressure accumulator is so great that the pump can no longer generate any further pressure increase in the pressure accumulator.
  • the method is particularly preferred if the method steps a) to d) are carried out repeatedly during the operation of the metering device. Furthermore, the method is preferred if, for setting the pressure in step c), the pressure is reduced, in particular in which the return valve is opened. In order to set a precise pressure in the pressure accumulator, which is desired in order to be able to carry out a very accurate metering with the metering valve, the return valve is therefore preferably opened.
  • step b) preferably continues to take place. The return valve remains open and the pump is activated. By a return flow of liquid additive through the return valve, the pressure in the accumulator remains constant.
  • the method is preferred if at least steps c) and d) at least partially run parallel to each other. Even more preferably, even steps b), c) and d) take place at least partially in parallel (at the same time).
  • the metering valve is opened.
  • liquid additive flows from the pressure accumulator through the metering valve to a consumer for the liquid additive.
  • the consumer of the liquid additive is preferably an exhaust gas treatment device in which the selective catalytic reduction process is carried out with the liquid additive.
  • the process steps b) and c) preferably continue to take place.
  • the pump continues to be activated and continues to deliver liquid additive into the accumulator.
  • the return valve is also preferred During step d) continues to open and ensures that the pressure in the pressure accumulator on the dosing required for dosing of, for example. A value between 5 and 10 bar, eg. 7 bar, is set.
  • the return valve is preferably not always open, but it is opened under pressure control, respectively, as soon as the pressure in the accumulator exceeds the metering pressure. As a result, the pressure in the pressure accumulator is always adjusted during dispensing of the additive through the metering valve to the metering pressure.
  • the dosing request determined in step a) is delivered in several pulses. A pulse corresponds in each case to an opening operation and a closing operation of the metering valve.
  • step d) it is preferable after step d) in each case to deactivate the pump.
  • the pump is then activated again only when a new dosing request is detected in a new step a).
  • the pump runs in particular during operation of a delivery line and a motor vehicle in which the metering device is arranged, not continuously, but the pump is regularly activated only when a Dosierancum is present.
  • the process step e) is preferably carried out repeatedly together with the process steps a) to d).
  • step e By lowering the pressure in the pressure accumulator in step e), it is possible to relieve the pressure accumulator between two dosing requirements. This can increase the durability of the metering device become.
  • the discharge of the accumulator can be actively carried out in a variant embodiment.
  • a return valve which branches off from the pressure accumulator, may optionally be opened actively in step e) in order to allow the liquid additive to escape from the pressure accumulator and thus to ensure a lowering of the pressure in the pressure accumulator.
  • This return valve can be identical to the return valve used in step c) of the method and have an additional possibility for active opening in step e). But it is also possible that an additional return valve is provided for step e), which can be actively opened, and is preferably arranged in a parallel second return line from the pressure accumulator to the tank.
  • an active discharge takes place through the pump of the delivery unit.
  • the pump may optionally be operated counter to the conveying direction in step e) in order to convey liquid additive out of the accumulator back into the tank, so that the pressure in the pressure accumulator decreases and the pressure accumulator is relieved.
  • a passive discharge of the pressure accumulator takes place.
  • a return valve and / or by the pump in step e a Lekagestrom flow of liquid additive back into the tank, through which the pressure in the pressure accumulator lowers.
  • the pressure in the pressure accumulator decreases comparatively slowly, because the leakage flow is regularly relatively small. Otherwise, the effect of the leakage flow on the pressure in the pressure accumulator would be too great during the dosing in step d).
  • the return valve is a passively opening valve whose opening pressure corresponds to the metering pressure.
  • the return valve is preferably a passively-opening valve which opens at a predetermined or preset limit pressure, which limit pressure corresponds to the metering pressure (the pressure with which the additive is metered in).
  • the return valve preferably has a valve body and a valve spring which biases the valve body. The return valve opens when the force exerted on the return valve by the liquid additive present in the pressure accumulator exceeds the spring force of the spring in the return valve.
  • the metering device can be designed without an electrically driven metering valve and / or without an (active) control unit of the return valve.
  • the return valve is an active-opening valve with a valve drive, wherein a pressure sensor is arranged on the pressure accumulator and the return valve is controlled by means of the valve drive by a control unit, in step c) the pressure in the pressure accumulator to set to the desired metering pressure.
  • the valve drive may, for example, be an electromagnet, which exerts a force on an armature in the return valve, by means of which the return valve can be opened and / or closed.
  • the pressure sensor can be embodied, for example, as an electronic pressure sensor which measures a pressure in the pressure accumulator and transmits it as an electrical signal to the control unit.
  • This pressure information is then processed in the control unit to specify whether the return valve is opened and / or closed (control loop). Also advantageous is the method when the pump has a pump chamber and at least one pump valve, which predetermines a conveying direction.
  • the pump chamber is preferably acted upon by a diaphragm or a pump piston with a pump movement.
  • two pump valves are provided, which are each passively opening and are arranged in the flow direction of the liquid additive from the tank to the metering valve in front of and behind the pump chamber.
  • only a single pump valve is provided. This single pump valve is then preferably provided in the flow direction behind the pump chamber.
  • the pump piston is then adapted to push out the liquid additive in the pump chamber through the pump valve during a delivery movement (ejection movement).
  • a delivery movement ejection movement
  • liquid additive flows into the pump chamber.
  • the inventive method finds particular application in a metering device, which preferably has no pressure sensor on the pressure accumulator, with which the pressure in the pressure accumulator is electronically monitored.
  • the pressure in the accumulator is set in this case alone by the return valve.
  • the return valve preferably acts mechanically.
  • Exhaust gas treatment device for cleaning the exhaust gases of the internal combustion engine and a metering device, with which the exhaust gas treatment device, a liquid additive can be supplied, and which for operation according to the described method furnished and designed.
  • the motor vehicle is preferably a passenger car or a truck.
  • the internal combustion engine is preferably a diesel internal combustion engine.
  • the exhaust treatment device preferably comprises an SCR catalyst for carrying out the selective catalytic reduction process.
  • the exhaust treatment device is preferably supplied with reducing agent and, in particular, urea-water solution upstream of the SCR catalyst. With the reducing agent, the method of selective catalytic reduction is then performed in the exhaust gas treatment apparatus to effectively reduce nitrogen oxide compounds in the exhaust gas.
  • FIGS. 1 shows a metering device together with a tank and a
  • FIG. 2 shows a further embodiment variant of a metering device together with a tank and an exhaust gas treatment device
  • FIG. 3 shows a motor vehicle having a metering device
  • Fig. 1 shows a metering device 1 together with a tank 3 and an exhaust treatment device 11.
  • the metering device 1 takes the tank 3 liquid additive (urea-water solution) at a sampling point 17.
  • a delivery line 18, which first to a pump 2 runs.
  • the delivery line 18 extends further to a metering valve 5, with which the liquid additive can be supplied into an exhaust gas flow 13 in the exhaust gas treatment device 11.
  • the liquid additive is conveyed by the conveying action of the pump 2 from the tank 3 through the delivery line 18 to the metering valve 5.
  • a pressure accumulator 4 In the conveying direction from the tank 3 to the metering valve 5 behind the pump 2 is a pressure accumulator 4.
  • the pressure accumulator 4 may be partially formed by the delivery line 18, for example, characterized in that the delivery line 18 is designed as a flexible hose. Starting from the pressure accumulator 4 branches off a return line 12, which leads back into the tank 3. In the return line 12, a return valve 6 is arranged. With such a metering device, the inventive method can be carried out in a particularly advantageous manner.
  • a valve drive 19 is provided, with which the return valve 6 can be opened and closed.
  • a pressure sensor 20 Adjacent to the pressure accumulator 4, a pressure sensor 20, with which the pressure in the pressure accumulator 4 can be measured.
  • the pressure information which is determined by the pressure sensor 20, arrives at a control unit 21 and is processed there.
  • the control unit 21 can open and close the return valve 6 with the aid of the valve drive 19 as needed.
  • FIG. 3 shows a motor vehicle 9, comprising an internal combustion engine 10 and an exhaust gas treatment device 11 with which the exhaust gases of the internal combustion engine 10 are cleaned can be.
  • the exhaust gases of the internal combustion engine 10 flow through the exhaust gas treatment device 11 as the exhaust gas flow 13.
  • a metering valve 5 is provided with which a liquid additive can be supplied to the exhaust gas treatment device 11.
  • the metering valve 5 is supplied by a metering device 1 with liquid additive from a tank 3.
  • Fig. 4 shows a first flow diagram of the method according to the invention.
  • the time axis 14 and the pressure axis 15 of the diagram can be seen.
  • a pressure curve 16 is plotted during the method according to the invention.
  • the pressure profile 16 is representative of the pressure in the pressure accumulator of the described metering device.
  • the pressure in the pressure accumulator is at a low, constant rest pressure level, which is, for example, less than 2 bar.
  • a dosing request is detected. If a dosing request has been detected, in step b) the activation of the pump increases the pressure in the pressure reservoir as described above.
  • the pressure curve 16 increases sharply.
  • step b the pressure is sometimes increased so much that it exceeds a dosing pressure 8.
  • step c the pressure on the metering pressure 8 is set as described above.
  • step d) a discharge of the liquid additive through the metering valve, wherein the liquid additive has the metering pressure 8.
  • step e) is carried out, in which the pressure in the pressure accumulator drops again.
  • the pressure profile 16 is preferably reduced back to the static pressure 7 from step a).
  • An active implementation of step e) (for example, by an active opening of a return valve or a recovery by means of the pump) is not necessary.
  • step e) passively drops (for example due to a leakage flow through a return valve or through the pump).
  • steps a), b), c), d) and e) are shown again. It can be seen that the method steps are carried out regularly in the manner of a loop.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Accessories For Mixers (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un dispositif de dosage (1) servant à délivrer un additif liquide. Le dispositif de dosage comporte au moins une pompe (2) servant à refouler l'additif hors d'un réservoir (3) dans un accumulateur de pression (4), une soupape de dosage (5) qui est configurée pour délivrer de manière dosée l'additif se trouvant dans l'accumulateur de pression (4), et une soupape de retour (6), qui permet de rediriger vers le réservoir (3) l'additif se trouvant dans l'accumulateur de pression (4). Le procédé comprend les étapes qui suivent : tout d'abord une étape a) qui consiste à définir une spécification de dosage ; une étape b) qui consiste ensuite à activer la pompe (2) pour établir une pression dans l'accumulateur de pression (4) ; une étape c) qui consiste à ajuster la pression dans l'accumulateur de pression (4) à une pression de dosage souhaitée ; et une étape d) qui consiste à délivrer l'additif liquide par la soupape de dosage (5).
EP13703009.4A 2012-02-03 2013-02-01 Procédé permettant de faire fonctionner un dispositif de dosage Withdrawn EP2809898A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012002059A DE102012002059A1 (de) 2012-02-03 2012-02-03 Verfahren zum Betrieb einer Dosiervorrichtung
PCT/EP2013/052044 WO2013113882A2 (fr) 2012-02-03 2013-02-01 Procédé permettant de faire fonctionner un dispositif de dosage

Publications (1)

Publication Number Publication Date
EP2809898A2 true EP2809898A2 (fr) 2014-12-10

Family

ID=47678778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13703009.4A Withdrawn EP2809898A2 (fr) 2012-02-03 2013-02-01 Procédé permettant de faire fonctionner un dispositif de dosage

Country Status (9)

Country Link
US (1) US20140338311A1 (fr)
EP (1) EP2809898A2 (fr)
JP (1) JP2015507125A (fr)
KR (1) KR101719403B1 (fr)
CN (1) CN104093946A (fr)
DE (1) DE102012002059A1 (fr)
IN (1) IN2014DN06574A (fr)
RU (1) RU2595705C2 (fr)
WO (1) WO2013113882A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019156690A1 (fr) * 2018-02-12 2019-08-15 Cummins Emission Solutions Inc. Ensemble d'insertion de réducteur comprenant une vessie
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RU2014135644A (ru) 2016-03-27
JP2015507125A (ja) 2015-03-05
RU2595705C2 (ru) 2016-08-27
KR101719403B1 (ko) 2017-03-23
CN104093946A (zh) 2014-10-08
KR20140115351A (ko) 2014-09-30
US20140338311A1 (en) 2014-11-20
WO2013113882A3 (fr) 2013-10-03
WO2013113882A2 (fr) 2013-08-08
DE102012002059A1 (de) 2013-08-08

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