EP4229281A1 - Procédé d'adaptation du débit volumique - Google Patents

Procédé d'adaptation du débit volumique

Info

Publication number
EP4229281A1
EP4229281A1 EP21787402.3A EP21787402A EP4229281A1 EP 4229281 A1 EP4229281 A1 EP 4229281A1 EP 21787402 A EP21787402 A EP 21787402A EP 4229281 A1 EP4229281 A1 EP 4229281A1
Authority
EP
European Patent Office
Prior art keywords
injector
pump
opening
rotational speed
pressure
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Withdrawn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
EP21787402.3A
Other languages
German (de)
English (en)
Inventor
Tobias Luebbert
Peter Bauer
Cornelius Köhler
Youness Idar
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.)
Vitesco Technologies GmbH
Original Assignee
Vitesco Technologies 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 Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of EP4229281A1 publication Critical patent/EP4229281A1/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Withdrawn legal-status Critical Current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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. by adjusting the 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
    • 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
    • F01N2610/1446—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
    • F01N2610/1453—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
    • 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
    • F01N2900/04—Methods of control or diagnosing
    • 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
    • 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
    • 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
    • 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
    • F01N2900/1821—Injector parameters
    • 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
    • F01N2900/1822—Pump parameters
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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 delivery device for an aqueous urea solution in a motor vehicle, with a pump for delivering the aqueous urea solution, the aqueous urea solution being delivered from a tank to an injector along a pressure line, the injector being arranged on an exhaust pipe and is designed for injecting the aqueous urea solution into the exhaust gas line, the delivery speed of the pump being controlled depending on the opening and closing processes of the injector and/or the resulting pressure conditions in the delivery section between the pump and the injector.
  • ammonia NH3
  • ammonia is not usually kept as pure ammonia, since this can lead to problems, particularly in motor vehicles or other mobile applications. Rather, instead of storing the reducing agent itself, reducing agent precursors are often stored and carried along.
  • a reducing agent precursor is understood to mean, in particular, a substance which splits off the reducing agent or can be chemically converted into the reducing agent.
  • ammonia urea is a reducing agent precursor.
  • the aqueous ammonia solution, the urea is carried in a tank and pumped into the exhaust pipe in precisely metered quantities using a suitable pumping device.
  • the conveying device regularly has, among other things, a pump for conveying the fluid, one or more filters for cleaning the fluid, optionally heating devices for thawing the fluid and a control device for processing internal and external data and for controlling the pump, the heating devices and others controllable components, such as the injector.
  • a disadvantage of the devices in the prior art is in particular that the durability of the injector is no longer given to a sufficient extent, since it is exposed to increasing loads due to increased injection frequencies and the increasing need for reducing agent for exhaust gas aftertreatment.
  • the object of the present invention is to create a method for operating a delivery device and an injector, which allows the correct and necessary amount of reducing agent to be fed into the exhaust pipe and at the same time reduce the load on the injector in order to produce longer service life.
  • the object with regard to the method is solved by a method having the features of claim 1 .
  • One embodiment of the invention relates to a method for operating a delivery device for an aqueous urea solution in a motor vehicle, with a pump for delivering the aqueous urea solution, the aqueous urea solution being delivered from a tank to an injector along a pressure line, the injector being connected to a exhaust line is arranged and is designed for injecting the aqueous urea solution into the exhaust line, the delivery speed of the pump depending on the opening and closing processes of the injector and / or the resulting pressure conditions in the delivery section between the pump and the injector is controlled.
  • the opening frequency is reduced. It is particularly advantageous if the opening frequency is approximately one to four hertz. This has the disadvantage that the opening time of the injectors has to be correspondingly longer in order to nevertheless deliver the same or even a higher volume. This results in a drop in pressure within the pressure line.
  • the conveying device basically has a pressure controller that works on the principle of a PID controller. In a device known from the prior art, such a pressure drop within the pressure line would be compensated for by the PID controller. However, regulators of this type have an inertia, which means that it is not possible to compensate for the resulting pressure drop quickly enough and accurately enough.
  • the pressure drop is overcompensated and so-called overshooting occurs.
  • pressure pulsations can be generated within the pressure line, which on the one hand make it difficult to deliver the correct required delivery quantity and on the other hand can lead to damage to the pump stage.
  • the method according to the invention therefore tries to compensate for the pressure drop without causing harmful pressure pulsations.
  • the pump is therefore preferably not manipulated exclusively by regulating by means of a regulator, which records measured values, evaluates them and sends corresponding signals to the pump.
  • the I components and the D components of the controller can be optimally adjusted if the opening times are known, in order to keep the resulting instability, ie the fluctuations, in the system as low as possible.
  • the pump, or the rotational speed of the pump is additionally changed by a default value which is dependent on the system used, for example the length of the pressure line, the injector used or the rigidity of the pressure line.
  • the default value for increasing the rotation speed can be a single value.
  • it can be formed by a value curve or from a characteristic map, which has a family of values for different operating states.
  • the opening processes or the opening times can, for example, be stored in a characteristic map in the control unit of the injector, as a result of which they are known.
  • the pressure conditions in the pressure line can be detected, for example, via a sensor.
  • the pump preferably continuously delivers the fluid from the tank into the pressure line. This also happens when the injector is closed. By promoting when the injector is closed, the system pressure is maintained, especially in the pressure line directly in front of the injector. If the injector remains closed and is therefore not injected into the exhaust line, the fluid is pumped back into the tank by means of a bypass circuit that can be provided. Thus, a constant system pressure is maintained by a preselected rotational speed of the pump. During operation, the pump is constantly operated at this preselected rotational speed. The pressure fluctuations caused by the opening and closing of the injector are compensated for or minimized by adjusting the rotational speed of the pump according to the invention.
  • the rotational speed of the pump and thus the delivery quantity per unit of time is linked to the opening processes of the injector.
  • the coupling to the opening process is advantageous since the pressure fluctuation, in particular the pressure drop, in the pressure line is caused by the opening process.
  • the rotational speed of the pump and thus the flow rate per unit of time are synchronized with the opening and closing processes of the injector.
  • the rotational speed is increased in order to temporarily increase the pressure in the pressure line.
  • the pressure drop that occurs as a result of the opening is compensated, which in particular can also ensure that the delivery quantity required for exhaust gas aftertreatment can also be provided in the available opening time of the injector.
  • the rotational speed of the pump can also be increased during an opening interval of the injector in order to deliver the correct delivery volume independently of possible pressure fluctuations.
  • a pressure build-up phase follows in which fluid is conveyed from the tank into the pressure line in order to build up a predetermined system pressure. Reaching this system pressure is the basic prerequisite for starting the dosing of the fluid via the injector into the exhaust pipe can be. It is also conceivable that the pump is in idle mode before the injector opens and is operated at a speed that is sufficient to maintain a certain minimum pressure in the pressure line, but not to provide the required delivery rate.
  • the rotational speed of the pump is additionally increased from the regular level, which would be sufficient in a system not according to the invention to deliver the correct flow rate, in order to continue to compensate for the pressure drop caused by the opening of the injector.
  • the rotational speed of the pump is increased shortly before the injector opens, at the same time as the injector opens or shortly after the injector opens.
  • the increase in the rotational speed of the pump can take place with a time advance before the actual opening process of the injector if the opening time is known. Alternatively, the increase can take place at the same time as the opening of the injector or even with a time delay after the opening.
  • a preferred exemplary embodiment is characterized in that the pressure level within the pressure line from the delivery device to the injector is detected, with the rotational speed of the pump being increased depending on the detection of a pressure drop.
  • the pressure level in the pressure line is a direct indicator that allows conclusions to be drawn about the opening status of the injector.
  • a drop in pressure is recorded immediately when or after the opening of the injector. As soon as such a pressure drop is detected, this pressure drop can be counteracted by increasing the rotational speed.
  • the current with which the injector is supplied with current for the purpose of opening is detected, with the rotational speed of the pump being increased depending on the strength of the current present at the injector.
  • Current readings of one amp are a sure sign of a fully open injector.
  • the start of the opening process can be precisely detected by the increase in current from approximately the initial level of zero amperes.
  • the rotational speed of the pump during the time that the injector is open is independent of the delivery volume required for exhaust gas aftertreatment. This is expressed in that, according to the invention, the rotational speed of the pump is increased to a level above the rotational speed of the pump, which would be necessary to deliver the required volume.
  • the rotational speed of the pump when the injector is open is based on the so-called static injector flow, which is a variable determined by the hardware, ie the structure, of the injector and is known for the injector used in each case. The rotational speed of the pump is thus kept at a level which is sufficient to promote the static injector flow.
  • Static injector flow is the flow through the injector when it is not fully open.
  • the rotational speed of the pump which is increased while the injector is open, is reduced again as soon as a closing process of the injector is detected shortly after the injector is closed or with a defined time offset to the closing process of the injector .
  • the method according to the invention can also be used for devices with two injectors.
  • the increase in rotational speed to compensate for the drop in pressure is designed in such a way that the drop in pressure in both pressure lines is compensated for in each case to match the opening process of the respective injector.
  • An advantage of the method according to the invention is in particular a constant pressure level within the pressure line with simultaneous protection of the injectors due to a lower opening frequency.
  • the constant pressure or the lower pressure fluctuations ensure that the spray cone of the injector is constant and corresponds to the original design at all times.
  • a drop in pressure would result in the spray cone generated by the injector not forming correctly within the exhaust pipe, which would degrade the conversion of the aqueous urea solution and thus also the exhaust gas aftertreatment overall.
  • the dosing accuracy of the delivery device is improved since there are no major pressure fluctuations in the pressure line or at the pump. Furthermore, by increasing the rotational speed by a default value instead of an active control element, a faster adaptation of the rotational speed is achieved.
  • FIG. 1 is a diagram showing the volume flow conveyed by the conveying device using the method according to the invention
  • FIG. 1 shows a diagram which, in the lower part 1, indicates the state of the injector.
  • the state “0” designates the closed injector
  • the state “1” designates the open injector.
  • the time is plotted along the X-axis and several opening processes and closing processes are shown.
  • Diagram 2 is shown above it, which also shows the time on the x-axis, the volume flow of the aqueous urea solution being conveyed by the pump being plotted along the y-axis.
  • the volume flow is made up of different partial volume flows 3, 4, some of which remain constant over time.
  • the uppermost portion 5 of the volume flow shows the volume flow that is additionally delivered by the pump depending on the opening state of the injector.
  • the portion which is additionally promoted by increasing the pump speed at the time the injector opens (status of the injector changes from “0” to “1”) is identified by reference number 6 .
  • This proportion 6 is not constant over the course of time, but is increased for a limited time in accordance with the opening and closing of the injector.
  • the volume flow consisting of the partial volume flows 3, 4 and the proportion of the volume flow 5 when the injector is closed corresponds to the volume flow normally required to deliver the required amount of aqueous urea solution.
  • the proportion marked with the reference number 6 corresponds to the volume flow which is additionally conveyed by increasing the rotational speed of the pump according to the invention.
  • FIG. 1 has no restrictive character and serves to clarify the idea of the invention.

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)

Abstract

L'invention concerne un procédé pour faire fonctionner un dispositif de transport pour une solution aqueuse d'urée dans un véhicule automobile, ayant une pompe pour transporter la solution aqueuse d'urée, la solution aqueuse d'urée étant transportée d'un réservoir le long d'une conduite de pression vers un injecteur, l'injecteur étant disposé sur une ligne d'échappement et étant conçu pour injecter la solution aqueuse d'urée dans la ligne d'échappement, la vitesse de transport de la pompe étant commandée en fonction des opérations d'ouverture et de fermeture de l'injecteur et/ou des conditions de pression qui en résultent dans la section de transport entre la pompe et l'injecteur.
EP21787402.3A 2020-10-14 2021-10-05 Procédé d'adaptation du débit volumique Withdrawn EP4229281A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020212961.4A DE102020212961B4 (de) 2020-10-14 2020-10-14 Verfahren zum Betreiben einer Fördervorrichtung
PCT/EP2021/077461 WO2022078822A1 (fr) 2020-10-14 2021-10-05 Procédé d'adaptation du débit volumique

Publications (1)

Publication Number Publication Date
EP4229281A1 true EP4229281A1 (fr) 2023-08-23

Family

ID=78085689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21787402.3A Withdrawn EP4229281A1 (fr) 2020-10-14 2021-10-05 Procédé d'adaptation du débit volumique

Country Status (5)

Country Link
US (1) US12060823B2 (fr)
EP (1) EP4229281A1 (fr)
CN (1) CN116324135A (fr)
DE (1) DE102020212961B4 (fr)
WO (1) WO2022078822A1 (fr)

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5411002A (en) 1991-02-28 1995-05-02 Walter Potoroka, Sr. Internal combustion engine fuel injection apparatus and system
JP4867675B2 (ja) * 2007-01-23 2012-02-01 株式会社デンソー 還元剤供給装置
WO2010129841A1 (fr) 2009-05-07 2010-11-11 Smith Clyde M Système de distribution de fluide à régulation thermique
DE102010000931A1 (de) * 2010-01-15 2011-07-21 Robert Bosch GmbH, 70469 Verfahren zur Überwachung eines hydraulischen Drucksystems
DE102010030858A1 (de) * 2010-07-02 2012-01-05 Robert Bosch Gmbh Verfahren zur Überwachung einer Dosiereinrichtung
DE102013105710B4 (de) * 2013-06-04 2025-05-28 Schaeffler Technologies AG & Co. KG Verfahren zum Betrieb einer Vorrichtung zur Förderung einer Flüssigkeit
KR101882664B1 (ko) * 2014-08-15 2018-08-24 로베르트 보쉬 게엠베하 압력 제어를 갖는 디젤 배기 유체 전달 시스템
DE102015203437B3 (de) * 2015-02-26 2016-06-09 Continental Automotive Gmbh Verfahren zum Betrieb einer Vorrichtung zur dosierten Bereitstellung einer Flüssigkeit
US10301996B2 (en) * 2015-10-08 2019-05-28 Cummins Emission Solutions Inc. System and method for varying reductant delivery pressure to aftertreatment systems
CN108474282B (zh) * 2016-01-22 2021-04-30 康明斯有限公司 确定还原剂输送性能的系统和方法
DE102016215380A1 (de) * 2016-08-17 2018-02-22 Robert Bosch Gmbh Verfahren zur Erkennung einer blockierten Druckleitung
JP2019007351A (ja) * 2017-06-20 2019-01-17 日野自動車株式会社 尿素ｓｃｒシステム
JP2019105259A (ja) * 2017-12-14 2019-06-27 トヨタ自動車株式会社 還元剤添加装置の異常診断装置
JP6988433B2 (ja) * 2017-12-18 2022-01-05 株式会社デンソー 異常判定装置
US10753254B2 (en) * 2018-03-06 2020-08-25 Cummins Emission Solutions Inc. Reductant insertion assemblies including multiple metering assemblies and a single pump
WO2020032933A1 (fr) * 2018-08-07 2020-02-13 Cummins Emission Solutions Inc. Systèmes et procédés pour augmenter la précision d'insertion de réducteur
JP6939739B2 (ja) * 2018-08-21 2021-09-22 トヨタ自動車株式会社 流体供給装置の故障診断装置、及び流体供給装置の故障診断方法

Also Published As

Publication number Publication date
CN116324135A (zh) 2023-06-23
DE102020212961B4 (de) 2024-02-29
US12060823B2 (en) 2024-08-13
DE102020212961A1 (de) 2022-04-14
WO2022078822A1 (fr) 2022-04-21
US20230383684A1 (en) 2023-11-30

Similar Documents

Publication Publication Date Title
DE102009005790B4 (de) Dosiersystem
EP2013456B1 (fr) Dispositif pour acheminer un agent reducteur dans une branche de gaz d'echappement d'un moteur a combustion interne
EP1399653B1 (fr) Dispositif et procede de dosage d'un agent reducteur permettant d'eliminer des oxydes d'azote contenus dans des gaz d'echappement
DE102009023325B4 (de) Verfahren zur Adaption der Injektionsmittelzufuhr in einem Injektionssystem
EP2504540B1 (fr) Procédé de fonctionement d'un dispositif d'alimentation d'un moyen de reduction
DE102012204385B4 (de) Verfahren und Steuereinheit zur Dosierung von Kraftstoff in einen Abgaskanal
DE102009005012B4 (de) Verfahren zum Betreiben einer Dosiereinrichtung und Dosiereinrichtung
DE102012204100B4 (de) Fluidfördersystem und Verfahren zum Fördern eines Fluids
DE102020212961B4 (de) Verfahren zum Betreiben einer Fördervorrichtung
EP2693014A1 (fr) Système de dosage d'agent de réduction avec chambre de dosage pour le réglage exact de la quantité de dosage
DE102012213525A1 (de) Verfahren zur Überwachung eines Förder- und Dosiersystems
WO2012150103A1 (fr) Dispositif de pompage pour système de dosage
EP3529469A1 (fr) Procédé d'augmentation de la précision quantitative dans des systèmes de dosage à pression régulée
EP2662550B1 (fr) Système de dosage d'agent réducteur avec aération automatique de la conduite d'agent réducteur
DE102019207142A1 (de) Systeme und Verfahren zur Kompensation eines Reduktionsmittelabgabesystems in einem Nachbehandlungssystem eines Verbrennungsmotors
EP3337962B1 (fr) Dispositif d'alimentation en carburant pour injection moteur et post-traitement des gaz d'échappement
DE102019007085B4 (de) Verfahren zum Betrieb eines Förder-Dosiersystems für ein Fluid, Förder-Dosiersystem und Kraftfahrzeug mit einem derartigen Förder-Dosiersystem
EP1222371B1 (fr) Dispositif pour le dosage d'un agent de reduction
DE102024203402B4 (de) Verfahren zur Bestimmung einer Systemsteifigkeit
DE102016210619A1 (de) Verfahren zur Diagnose eines Reagenzmittel-Dosiersystems, Vorrichtung zur Durchführung des Verfahrens, Computer-Programm sowie Computer-Programmprodukt
DE102014200805A1 (de) Verfahren zur volumetrischen Adaption von Fertigungstoleranzen bei einem SCR-Katalysatorsystem
EP4256182B1 (fr) Procédé et dispositif permettant le dosage d'une solution d'urée aqueuse
DE102015201859A1 (de) Verfahren und Vorrichtung zum Kalibrieren eines Druckmodells
DE102018216848A1 (de) Verfahren zum Betreiben eines Dosiersystems, Dosiersystem
WO2010066546A1 (fr) Procédé d'adaptation de l'alimentation en agent réducteur, notamment dans un système de traitement des gaz d'échappement comportant un catalyseur à réduction catalytique sélective ou un filtre à particules diesel

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230515

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230830

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20231123