WO2012072666A1 - Procédé de détermination d'un volume instantané d'un liquide dans un réservoir, notamment pour un véhicule à moteur - Google Patents

Procédé de détermination d'un volume instantané d'un liquide dans un réservoir, notamment pour un véhicule à moteur Download PDF

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Publication number
WO2012072666A1
WO2012072666A1 PCT/EP2011/071354 EP2011071354W WO2012072666A1 WO 2012072666 A1 WO2012072666 A1 WO 2012072666A1 EP 2011071354 W EP2011071354 W EP 2011071354W WO 2012072666 A1 WO2012072666 A1 WO 2012072666A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
liquid
signal
sno
current
Prior art date
Application number
PCT/EP2011/071354
Other languages
German (de)
English (en)
Inventor
Paul Rodatz
Michael Nienhoff
Ingo Koops
Tino Arlt
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2012072666A1 publication Critical patent/WO2012072666A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
    • 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
    • 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
    • F01N2900/1814—Tank level
    • 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 determining a current filling quantity of a liquid in a container, in particular the current residual filling quantity of a reducing agent in a reducing agent container of an SCR metering device of a motor vehicle.
  • exhaust gas is produced, which contains pollutants such as hydrocarbon (HC), carbon monoxide (CO), nitrogen oxides (NO x ) and particles.
  • pollutants such as hydrocarbon (HC), carbon monoxide (CO), nitrogen oxides (NO x ) and particles.
  • HC hydrocarbon
  • CO carbon monoxide
  • NO x nitrogen oxides
  • an exhaust gas purification system is usually used, which contains one or a plurality of catalysts, different gas sensors ⁇ off, and in the case of a diesel engine usually a particulate filter.
  • lean-burn engines diesel engines or gasoline lean-burn engines
  • nitrogen oxide reducing processes based on nitrogen oxide storage catalysts or
  • SCR Selective Catalytic Reduction
  • SCR catalysts require a reducing agent, usually ammonia (NH 3 ), for nitrogen oxide reduction.
  • the ammonia is usually by injection or injection of a urea-water solution and its hydrolysis in Exhaust tract of the engine generates and then fed to the SCR catalyst.
  • a metering of the reducing agent is effected by a timing of a metering valve, wherein the reducing agent is provided by a pump and a pressure regulator with a defined pressure from the metering valve.
  • the metered addition of the reducing agent must be continuously monitored as an overdose causes emissions of ammonia and underdosing may lead to excessive nitrogen oxide emissions.
  • Fuel tanks are used for application in aqueous urea solution because of the conductivity of the reducing agent, a corrosivity and crystallization during drying out problematic.
  • the level is determined by comparatively short and repeated measurements of the electrical resistance between two well-conductive electrodes (stainless steel rods).
  • the electrical resistance results from the limited conductivity of the reducing agent solution between the electrodes.
  • the electrical resistance is in principle indirectly proportional to the immersion depth of the electrodes.
  • Fill level sensor comprises three electrodes, wherein a bare, functioning as a ground electrode reference electrode, an electrically insulated level electrode and an electrically insulated reference electrode are provided.
  • a bare functioning as a ground electrode reference electrode
  • an electrically insulated level electrode functioning as a ground electrode reference electrode
  • an electrically insulated reference electrode By means of the level sensor, the level of the liquid in the container can be determined in three places, for which the
  • Level electrode is freed at both and the reference electrode only at its free L jossendendabexcellent of their respective insulating material.
  • This should be as simple as possible built-up level sensor are used, wherein, for. B. on the basis of a single or multiple measuring points, over a wide level range across the level of the liquid in the container should be determined.
  • the method should not be limited only to applications in the automotive sector.
  • the object of the invention is a reduction ⁇ achieved by a method for determining a current capacity of a liquid in a container, in particular the current residual capacity means in a reducing agent tank of an SCR dosing device of a motor vehicle, according to Claim. 1
  • a presence of liquid at a measuring point on / in the container is sensed or detected by a discontinuously and / or a discretely operating filling level sensor.
  • a single or a plurality of measuring points can be used, with a measuring point on a container inner wall is preferred.
  • the invention is based on a temporal characteristic of a signal of the level sensor, due to a sloshing or a back and forth of the liquid in the container, closed on the current capacity of the liquid in the container or determines the current capacity of the liquid in the container.
  • z. B possible to determine based on a measured frequency and / or a pulse width of the measuring signal, the filling amount or the level of the liquid in the container with only a single measuring point within the container for a wide range around the measuring point around.
  • This z. B. a simply constructed level sensor are used.
  • an additional parameter can be used.
  • Level sensor another or a plurality of other parameters are used.
  • the temporal characteristic of the signal of the level sensor is a digital signal, wherein by a
  • the current amount of liquid in the container can be determined.
  • an analogue signal can be used.
  • a frequency and / or a pulse width of the signal or portions of the signal so an analogue to the behavior of the liquid in the container with respect to the measuring point, are determined.
  • the current amount of liquid in the container is determined.
  • an acceleration of the liquid, of the container or in the field of motor vehicle technology can be used for that of the motor vehicle.
  • the frequency and / or the pulse width of the signal or portions of the signal are determined, further wherein the acceleration of the container or the
  • Motor vehicle can be used with.
  • one or a plurality of parameters can be used for determining the current filling level characteristic of the liquid in the container, within the function.
  • parameters in addition to the above-mentioned patent, in particular a rametern, optionally temperature-dependent visco sity ⁇ the liquid, a geometric factor of the container and / or a predetermined filling amount of the liquid in the container.
  • a multiplicity of fill-level characteristics of the characteristics can be determined in a characteristic diagram
  • Liquid in the container be stored in advance in time, the corresponding level characteristics is preferably determined in driving tests with the motor vehicle. Furthermore, it is preferred that a current filling level of the liquid in the container is determined on the basis of the current filling level characteristic using the characteristic field. In this case, the current fill level of the liquid in the container can then be determined based on the current fill level of the liquid in the container, preferably by means of a characteristic curve.
  • the at least one measuring point of the discontinuously and / or discretely operating level sensor with the exception of a reserve of the container, in an upper third with respect to a fully filled container, approximately at half height, in a lower third, in a lower Quarter, and / or as far as possible in / on the container arranged below.
  • the at least one discontinuously and / or discretely operating level sensor can be provided on / in the container, the level sensor preferably having at least one electrode immersed in the liquid in the container.
  • FIG. 2 shows a flow chart of the method according to the invention. The invention will be described below with reference to a method for
  • a filling amount of a liquid reducing agent in a reducing agent container for an SCR metering device in a motor vehicle explained in more detail.
  • the invention is not limited to such embodiments, but rather can be applied to all liquids or containers as long as the container or the liquid does not rest therein too much. Ie. the liquid and possibly also the container must be subjected to certain accelerations in at least one direction.
  • the internal combustion engine 3 is preferably a lean-burn engine, such as. B. a diesel or an Ot-to-lean engine, wherein as entrained liquid reducing agent 100 for the aftertreatment of an exhaust gas 50 z.
  • a lean-burn engine such as. B. a diesel or an Ot-to-lean engine, wherein as entrained liquid reducing agent 100 for the aftertreatment of an exhaust gas 50 z.
  • urea a urea-water solution, AdBlue®, Denoxium®, Aminex® o. A. is applicable, which releases 50 in the aftertreatment of the exhaust gas preferably ammonia.
  • the internal combustion engine 3 is supplied via an intake tract 32 a fresh air necessary for combustion.
  • An injection system such as a common rail with fuel injectors (not shown), can inject the fuel directly into the cylinders of the internal combustion engine 3.
  • the exhaust 50 of the Internal combustion engine 3 flows into an exhaust tract 34 for Ab ⁇ gas aftertreatment system and from this via a silencer, not shown, into the open.
  • a known control unit 2 is provided, which is designed in particular as an ECU (Engine Control Unit).
  • the control unit 2 is electrically or electronically connected to the internal combustion engine 3 via a data and / or control line indicated only in FIG. About this data and / or
  • Signals from sensors eg, temperature sensors for intake air, charge air, coolant, load sensor, speed sensor, etc.
  • actuators eg. injection valves, actuators, etc.
  • the exhaust aftertreatment system has a catalyst 20 designed in particular as an SCR catalytic converter 20, which preferably contains a plurality of catalyst units connected in series and unspecified. Upstream (reference numeral 40) and / or downstream (not shown) of the
  • SCR catalyst 20 may additionally be arranged in each case one preferably designed as an oxidation catalyst catalyst. Further, a metering control device 16 is provided which a reducing agent container 10 with an electric
  • controllable pump 12 is assigned for conveying the reducing agent 100.
  • the pump 12 can also be arranged inside the reducing agent tank 10.
  • AdBlue® As a reducing agent 100 is used in this embodiment AdBlue®, which is stored in the reducing agent tank 10.
  • the reducing agent container 10 preferably has an electrical heating device and sensors which detect the temperature of the reducing agent 100 in the reducing agent container 10. Signals of a temperature sensor arranged upstream of the SCR catalytic converter 20 and of a downstream of the SCR catalytic converter 8 are also sent to the dosing control device 16 arranged Abgasmessaufsmellings, such. B. a NO x sensor passed (not shown).
  • the Dosier horrinsky 16 controls a metering valve 14 preferably elec- romagneticians, which is supplied as required through a supply AdBlue by the pump 12 from the reductive ⁇ tion agent container 10th
  • a pressure sensor is preferably inserted, which detects a fluid pressure in the metering device 1 and emits a corresponding signal to the metering control device 16.
  • AdBlue® by means of the metering valve 14 takes place in the exhaust gas tract 34 upstream of the SCR catalytic converter 20 in or in the opposite flow direction of the exhaust gas 50.
  • the fresh air flows in the direction of the arrow shown in FIG. 2 into the internal combustion engine 3 into it and the exhaust gas 50 also in the arrow indicated there through the exhaust tract 34 therethrough.
  • the metering control device 16 is preferably connected to the control unit 2 for mutual data transfer via an electrical or electronic bus system, which is indicated by the arrows shown in FIG. 1. However, it may be realized in other embodiments such that the
  • Dosing control device 16 is realized in the control unit 2.
  • the bus system is used to calculate the quantity of Vioo to be dispensed to AdBlue®, such as operating parameters.
  • B. a speed, a fresh air mass, a fuel quantity, a control path of an injection pump, an exhaust gas mass flow, an operating temperature, a charge air temperature, an injection start, etc. passed to the dosing control 16.
  • Dosing control device 16 an amount to be injected Vioo to AdBlue® and via an electrical or electronic Ver ⁇ connection line from a corresponding electrical / electronic signal to the metering valve 14 from.
  • urea is hydrolyzed in AdBlue® and mixed with the Exhaust gas 50 mixed.
  • SCR catalyst 20 is the catalytic reduction of NO x in the exhaust gas 50 to N 2 and H 2 0.
  • the metering valve 14 for introducing AdBlue® in the exhaust tract 34 may largely correspond to a conventional low-pressure gasoline injection valve.
  • Level sensor 110 used which may be formed differently ⁇ .
  • Level sensor 110 is used, which at least at a single measuring point 112 in or inside the reducing agent container 10 can sense, detect or measure whether a level of the reducing agent 100 is above or below a measuring point 112 of the level sensor 110.
  • one or more level sensors 110 are also applicable, which can possibly also sense at several measuring points 122 whether reducing agent 100 is located at / in the measuring point 122. If the reducing agent tank 10 or the motor vehicle is moved or accelerated, then the reducing agent 100 sloshes in the reducing agent tank 10 - see the left in FIG. 2.
  • an evaluation function F, KF of the or the filling level sensors 110 no longer determine the filling level h or a current filling quantity V t or volume V t , ie a current residual filling quantity V t or volume V t , of the sloshing reducing agent 100 only at a specific level in the reducing agent container 10, but in a wide area around the measuring point 112 around.
  • a completely filled reducing agent ⁇ container 10 is correspondingly an output fill quantity V 0 or volume V 0 .
  • the sloshing of the reducing agent 100 during driving which is disadvantageous in the prior art, is now recognized as an advantage and correspondingly utilized in that the measuring range of the fill level sensor 110 is widened. Ie. In contrast to the state of the art, it is possible to determine reliable information about the current filling quantity V t while driving.
  • the discrete measuring signal Sno of the filling level sensor 110 is evaluated, which in the case of a sloshing of the reducing agent 100 within the reducing agent container 10 between the values "0" and " 1 "changes.
  • an acceleration a of the reducing agent 100 or of the reducing agent tank 10 or of the motor vehicle is used.
  • the acceleration a is directly present as an input signal, e.g. B. from an ESP control unit, or can by means of a speed of the motor vehicle, for. B. from an ABS control unit, are calculated.
  • the acceleration a can be an acceleration a in / against a forward direction of travel of the motor vehicle or else a transverse acceleration a.
  • a characteristic Char of the signal Sno is evaluated at a specific time period / point t and / or over a longer period t, with preferably a frequency f and / or a pulse width pw in the signal Sno or in a region or section of the signal Sno.
  • a filling level characteristic of the sloshing reduction stored in a characteristic field KF can be determined.
  • tion means 100 in the reducing agent tank 10, the filling height h or the current (residual) filling amount V t of the reducing agent 100 in the reducing agent container 10 are calculated.
  • the level characteristic stored in the characteristic field KF should be identified beforehand by driving tests with the motor vehicle or by other suitable methods. This can z.
  • the level characteristic recorded in the map KF is a behavior of the reducing agent 100 sloshing at the time t or in the period t in the reducing agent tank 10, from previously determined frequencies f, pulse widths pw and / or accelerations a with respect to the measuring point 112.
  • the current volume V t and the current (residual) filling quantity V t of reducing agent 100 in the reducing agent container 10 can be determined via a characteristic curve KL.
  • the characteristic curve KL of the reducing agent container 10 takes into account its geometry with respect to the filling height h of the reducing agent 100.

Abstract

L'invention concerne un procédé permettant de déterminer un volume instantané (Vt) d'un liquide (100) dans un réservoir (10), en particulier le volume résiduel instantané (Vt) d'un agent de réduction (100) dans un réservoir d'agent de réduction (10) d'un dispositif de dosage SCR (réduction catalytique sélective) d'un véhicule à moteur. Selon le procédé, la présence de liquide (100) en un point de mesure (112) sur/dans le réservoir (10) est déterminée par un capteur de niveau à fonctionnement discret ou discontinu et le volume instantané (Vt) du liquide (100) dans le réservoir (10) est déterminé à partir d'une caractéristique temporelle (Char; f, pw) d'un signal (S110) du capteur de niveau (110) en raison de fluctuations du niveau du liquide (100) dans le réservoir (10).
PCT/EP2011/071354 2010-12-01 2011-11-30 Procédé de détermination d'un volume instantané d'un liquide dans un réservoir, notamment pour un véhicule à moteur WO2012072666A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062302.4 2010-12-01
DE102010062302A DE102010062302A1 (de) 2010-12-01 2010-12-01 Verfahren zum Bestimmen einer aktuellen Füllmenge einer Flüssigkeit in einem Behälter, insbesondere für ein Kraftfahrzeug

Publications (1)

Publication Number Publication Date
WO2012072666A1 true WO2012072666A1 (fr) 2012-06-07

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WO (1) WO2012072666A1 (fr)

Families Citing this family (4)

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SE535932C2 (sv) * 2011-04-19 2013-02-26 Scania Cv Ab Förfarande och anordning för bestämning av resterande volym reduktionsmedel i en behållare vid ett SCR-system
DE102014216875A1 (de) * 2014-08-25 2016-02-25 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Ermitteln der Flüssigkeitsmenge von einer in einem Behälter eines Fahrzeugs bevorrateten Flüssigkeit
SE538928C2 (en) 2015-06-09 2017-02-21 Scania Cv Ab A method and a system for providing an auxiliary unit Joakim Sommansson, Grödinge, SE
DE102021213952A1 (de) 2021-12-08 2023-06-15 Vitesco Technologies GmbH Verfahren zur Feststellung einer Fehlfunktion eines Füllstandsgebers, Füllstandsgeber, Computerprogramm und computerlesbares Medium

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US3978464A (en) * 1974-11-04 1976-08-31 Chrysler Corporation Means for sensing change in the amount of fluent material in a reservoir
DE10047594A1 (de) 2000-09-26 2002-04-18 Siemens Ag Verfahren und Vorrichtung zum Bestimmen des Füllstandes einer Flüssigkeit in einem Behälter
US7392691B1 (en) * 2005-10-20 2008-07-01 Sierra Lobo, Inc. Method and apparatus for detecting the level of a liquid
US20090182467A1 (en) * 2008-01-10 2009-07-16 Felix Nedorezov Indicating a Low Volume of Fluid in a Transmission Sump
DE102008043778A1 (de) * 2008-11-17 2010-05-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur Füllstandsmessung

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US4908776A (en) * 1987-11-23 1990-03-13 Ford Aerospace & Communications Corporation Spacecraft fuel measurement
DE102008009154A1 (de) * 2008-02-14 2009-08-20 Robert Bosch Gmbh Verfahren zur Überwachung eines digitalen Tankfüllstandsgebers

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Publication number Priority date Publication date Assignee Title
US3978464A (en) * 1974-11-04 1976-08-31 Chrysler Corporation Means for sensing change in the amount of fluent material in a reservoir
DE10047594A1 (de) 2000-09-26 2002-04-18 Siemens Ag Verfahren und Vorrichtung zum Bestimmen des Füllstandes einer Flüssigkeit in einem Behälter
US7392691B1 (en) * 2005-10-20 2008-07-01 Sierra Lobo, Inc. Method and apparatus for detecting the level of a liquid
US20090182467A1 (en) * 2008-01-10 2009-07-16 Felix Nedorezov Indicating a Low Volume of Fluid in a Transmission Sump
DE102008043778A1 (de) * 2008-11-17 2010-05-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur Füllstandsmessung

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