WO2012143633A1 - Method for validating and detecting a change of reducing agent cannister in an scr system, exhaust line and vehicle - Google Patents

Method for validating and detecting a change of reducing agent cannister in an scr system, exhaust line and vehicle Download PDF

Info

Publication number
WO2012143633A1
WO2012143633A1 PCT/FR2012/050608 FR2012050608W WO2012143633A1 WO 2012143633 A1 WO2012143633 A1 WO 2012143633A1 FR 2012050608 W FR2012050608 W FR 2012050608W WO 2012143633 A1 WO2012143633 A1 WO 2012143633A1
Authority
WO
WIPO (PCT)
Prior art keywords
cartridge
pressure
cartridges
pipes
change
Prior art date
Application number
PCT/FR2012/050608
Other languages
French (fr)
Inventor
Vincent Dubois
Guillaume Massot
Thierry Bertin
Original Assignee
Peugeot Citroen Automobiles Sa
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
Priority claimed from FR1153416A external-priority patent/FR2974388B1/en
Priority claimed from FR1153432A external-priority patent/FR2974390B1/en
Application filed by Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Priority to EP12717795.4A priority Critical patent/EP2699773A1/en
Publication of WO2012143633A1 publication Critical patent/WO2012143633A1/en

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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/05—Systems for adding substances into 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
    • 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
    • F01N2610/06—Adding substances to exhaust gases the substance being in the gaseous 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/105—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
    • 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
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the invention lies in the technical field of the nitrogen oxides (NOx) aftertreatment system by injection of an exhaust reagent (SCR system - used later - for "selective catalytic reduction” in English or selective catalytic reduction), a gasoline or diesel engine.
  • SCR system used later - for "selective catalytic reduction” in English or selective catalytic reduction
  • gasoline or diesel engine a gasoline or diesel engine.
  • the SCR system (expression used later - for "selective catalytic reduction” in English or selective catalytic reduction) is one of the possible solutions for the post-treatment of nitrogen dioxides (NOx thereafter) on diesel engine .
  • the principle of such a system is to chemically reduce the NOx by adding a reducing agent (NH3 - ammonia) upstream of a specific SCR catalyst and thus to allow this type of engine to meet more emission levels. more strict.
  • control strategy requires either the addition of sensors or the addition of additional actuators (eg solenoid valves) to the system. Which has a cost and complicates the solution. It is therefore desirable that the control strategy uses the sensors and actuators already provided in the system and incorporates cartridge detection algorithms in use. The problem is having to make the system unavailable to perform the detection for a long time.
  • the invention provides a method for validating the detection of a nitrogen oxide reducer cartridge change in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector characterized in that the process comprises the production of a plurality of heaters within a first cartridge supplying the pipes,
  • the method comprises a delay before performing the validation step, during which no heating is performed. [Ooi 3] According to a variant, if following the completion of a heater in the second cartridge, a decrease in pressure is found, the cartridge change is not validated.
  • the invention also proposes a method for detecting a cartridge change of a gearbox in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector, characterized in that the method comprises
  • the regulation of the pressure within a first cartridge supplying the pipes comprising phases of pressure increase of the first cartridge
  • the pressure increase of the cartridges is achieved by heating the cartridges.
  • the SCR system comprises a control element which regulates the cartridges in pressure and ensures the pressure rise of the cartridges.
  • control control member regulates one cartridge at a time in pressure. According to a variant, after the validation of the supply of the pipes by the second cartridge, the control member regulates the pressure of the second cartridge.
  • the method further comprises measuring or estimating the pressure in the pipes.
  • the pressure in the pipes corresponds to the pressure of the cartridge having the greatest pressure.
  • the method comprises, during the validation of the supply change, an increase in the derivative of the pressure in the pipes.
  • an SCR system comprising a plurality of cartridges and ducts connecting the cartridges to a reducer injector in the exhaust gas pipe and
  • control command member for implementing the method as described above.
  • the invention also relates to a vehicle characterized in that it comprises a motor supplying exhaust gas an exhaust line as described above.
  • FIG. 1 a diagram of an SCR system
  • FIG. 4 graphs showing the detection of the cartridge change.
  • the invention relates to a method for validating the detection of a change of nitrogen oxide reducing cartridge in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector.
  • the method comprises producing a plurality of heaters within a first cartridge supplying the pipes, producing at least one heater of a second cartridge and detecting the supply of the pipes by the second cartridge.
  • the method further includes enabling the supply cartridge change by detecting an increase in the pressure in the pipes as a result of heating within the second cartridge. The method makes it possible to quickly check whether the cartridge is suitably changed.
  • FIG. 1 shows an SCR system 10.
  • the system 10 is part of an exhaust line comprising a pipe (not shown) in which a reducer is injected by an injector (not shown).
  • the system 10 comprises a storage unit composed of several tanks or cartridges 12 (121, 122, ... 12n) all connected by pipes 14.
  • the pipes 14 allow the transport of the reducer to the injector. All the cartridges are connected by a pipe 14 whose pressure is known by measurement with the aid of a pressure information member 16 which may be a sensor or an estimate.
  • Each cartridge 12 is connected to the pipe 14 by zero, one or more non-return valves 18.
  • the valves 18 are optional.
  • the system may include a cartridge without non-return valve and one or more cartridges with a non-return valve.
  • Each cartridge is heated by a dedicated heater 19.
  • the SCR system 10 further comprises a control element for the implementation of the method according to the invention.
  • the cartridges comprise a solid enclosing a gaseous reducing agent which is released by displacement of the chemical equilibrium, in particular by increasing the temperature of the solid.
  • the pressure increase of the cartridges is for example obtained by heating the cartridges.
  • the heating element is for example an external element or internal to the cartridge and may be a heating resistor.
  • the solid is for example a storage salt such as strontium chloride.
  • the reducing agent is, for example, ammonia in the gas phase.
  • the invention described is described for an SCR ammonia (gas) solution, but can be applied to all SCR concepts in gaseous form.
  • the advantage of the gaseous form is that it requires less energy to be released than a liquid reductant.
  • the control system control SCR comprises a pressure regulation of the cartridges 12, the pressure in the cartridges are not known, only the pressure of the pipes 14 is known.
  • the pressure regulation of the cartridges comprises phases of pressure increase of the cartridges by heating the cartridges 12. The pressure increase phases by heating are alternated with phases without heating involving a pressure drop.
  • a tank or cartridge is said to be active when the gas used by the system comes from the tank or cartridge, that is to say when its check valve 18 is open and puts in communication the volume of the cartridge with the pipeline.
  • check valve 18 is open and puts in communication the volume of the cartridge with the pipeline.
  • two cartridges will not be active at the same time, except for brief moments during the active cartridge change.
  • the strategy or method of validating the cartridge change 12 active is to detect an increase in the pressure characteristic of the heating of the active cartridge. For this, you must first have detected the change of active cartridge. Then, preferably, it is necessary not to have heated some time the two cartridges to not have false detection during the validation test.
  • the validation test consists in heating the supposed active cartridge and detecting an increase in the pressure in the pipes that would come from the increase of the pressure in the cartridge itself.
  • the strategy or process can be broken down into three phases. Phase 1 is the phase between the beginning of the active cartridge change and the detection of the active cartridge change. Phase 2 is the system preparation phase for the validation test. Phase 3 is the phase of the validation test completed by the confirmation or denial of the active cartridge change.
  • an active cartridge change was requested according to phase 1.
  • the cartridge 2 is heated according to 32 in Figures 2 and 3 during this phase so that its internal pressure increases and exceeds the pressure in the pipe which is that of the cartridge 1.
  • the cartridge 2 may undergo one or more heat.
  • the phase 1 ends with the detection 34 that the cartridge 2 has an internal pressure greater than that of the cartridge 1 and that it is now the cartridge 2 which is the pressure in the pipe. This is for example detected by the detection of the exceeding of a pressure threshold within the cartridge or by the detection of a variation of the pressure in the pipes while the first cartridge is outside of a rising phase. in pressure.
  • phase 2 the system 10 may be prepared to be in the right initial conditions to perform the validation test.
  • none of the cartridges is heated for a period of time which makes it possible to be sure that any increase in the pressure in the pipes 14 will be the result of the heating of the phase 3, and not of an earlier heating.
  • the pressure at the end of phase 2 is decreasing.
  • Phase 3 is that of the validation test.
  • the cartridge 2 supposed to be active is heated for a given time 36, which must cause an increase in the pressure in the pipes 14. This heating is preferably metered in order to guarantee the validation, but does not cause an excessive increase in the pressure of the system.
  • the method therefore implements an architecture of sensors and actuators for controlling and achieving the amount of gaseous reductant injected.
  • This method does not require a specific mode of operation causing a loss of time during the validation of the cartridge change.
  • the gain is technical in terms of the availability of the system, because the validation of the active cartridge change makes it possible to guarantee a good regulation of the pressure of the system without too much deviation from the set point and thus the availability of the injection of gas towards the exhaust.
  • the invention also relates to a method of detecting a cartridge change of a reducer in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector.
  • the method comprises the regulation of the pressure within a first cartridge supplying the pipes, the regulation comprising phases of pressure increase of the first cartridge, the pressure increase of a second cartridge, the detection of the supply of the pipes by the second cartridge by detecting a variation of the pressure in the pipes while the first cartridge is outside a pressure increase phase.
  • This invention makes it possible to detect in a simple manner the change of the active cartridge using the pressure information of the pipes only. It is therefore not necessary to add pressure sensors to know the pressure in the cartridges. In addition, this avoids over-consumption that can occur in electrical devices of the prior art.
  • the active cartridge is the one that presses the pipes 14.
  • the control member wishes to change the active cartridge, it continues the pressure control of the cartridge currently active (first cartridge) to ensure the functional performance of the system and pressurizes the cartridge soon active (second cartridge) until detect a significant variation in pressure even though the first cartridge is outside a phase of rise in pressure, that is to say in a phase where the first cartridge is not heated. This variation corresponds to the actual change of the active cartridge.
  • the cartridge that was rising in pressure becomes the active cartridge.
  • the SCR system comprises several cartridges 12 but the control member can regulate only one cartridge 12 at a time because the cartridge pressures are not known, only the pressure in the pipes 14 is known. At most, the member can pressurize a cartridge while regulating another pressure.
  • the pressure in the pipes 14 always corresponds to the pressure of the cartridge 12 having the greatest pressure (pressure difference ⁇ of the valve (s) 18 included).
  • the active cartridge is the one that presses the pipes.
  • the significant variation can be the acceleration of the pressure in the pipes 14.
  • the heating of the active cartridge always causes a positive acceleration of the pressure.
  • this acceleration is then due to the heating of the cartridge which rose in pressure and which becomes active.
  • Figure 4 shows the detection of the variation of the pressure in the pipes.
  • Figure 4 shows a graph at the top of the pressure variation in the pipelines.
  • Figure 4 shows below a graph relating to the acceleration of the pressure in the pipes.
  • Figure 4 still shows below a graph relating to the pressurization of the first cartridge 1 which is the active one.
  • FIG. 4 shows a bottom chart relating to the pressurization of the second cartridge 2 which is intended to replace the cartridge 1 as an active cartridge. Time is represented on the abscissa of the graphs.
  • the control control member regulates the pressure via the cartridge 1 and wants the cartridge 2 to become the active cartridge.
  • the arrows 40 and 42 show a positive acceleration which is detected a few seconds after the heating of the cartridge 1. In other words, the heating of the cartridge 1 is turned on and the cartridge is heated. This results in an acceleration of the pressure visible by two peaks on the second graph from the top.
  • the arrow 44 shows a positive acceleration which is detected while the cartridge 1 has not been heated. This acceleration is due to the pressurization of the cartridge 2 obtained by heating the cartridge whose heating is turned on. This acceleration means that the cartridge 2 becomes active and that the control command can therefore regulate the pressure on the cartridge 2.
  • the invention also relates to a vehicle comprising a motor supplying exhaust gas to an exhaust line.
  • the line includes the exhaust piping, the SCR system 10 having a plurality of cartridges 12 and the lines 14 connecting the cartridges to a reducer injector in the exhaust pipe.
  • the line also comprises the control element for the implementation of the gearbox cartridge change detection method.

Landscapes

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

Abstract

The invention relates to a method for validating the detection of a change of nitrogen oxide reducing agent cannister (12) in an SCR system (10) comprising a plurality of cannisters (12) and piping (14) connecting the cannisters to an injector, characterized in that the method involves carrying out a plurality of fittings within a first cannister, carrying out a heating of a second cannister, detecting supply by the second cannister, validating the change in supply cannister by detecting an increase in pressure in the lines following the carrying‑out of a heating within the second cannister. The invention also relates to a method for detecting a change in cannister, to an exhaust line and to a vehicle that has the line.

Description

PROCEDE DE VALIDATION ET DE DETECTION DE CHANGEMENT DE CARTOUCHE DE REDUCTEUR DANS UN SYSTEME SCR, LIGNE  METHOD FOR VALIDATION AND DETECTION OF REDUCER CARTRIDGE CHANGE IN SCR SYSTEM, LINE
D'ECHAPPEMENT ET VEHICULE  EXHAUST AND VEHICLE
[0001 ] La présente demande revendique la priorité des demandes françaises 1 153416 et 1 153432 déposées le 20 avril 201 1 dont les contenus (texte, dessins et revendications) sont ici incorporés par référence. The present application claims the priority of French applications 1 153416 and 1 153432 filed April 20, 201 1 whose contents (text, drawings and claims) are here incorporated by reference.
[ooo2] L'invention se situe dans le domaine technique du système de posttraitement des oxydes d'azote (NOx) par injection d'un réactif à l'échappement (système SCR - utilisée par la suite - pour « sélective catalytic réduction » en anglais ou réduction catalytique sélective), d'un moteur essence ou diesel. [Ooo2] The invention lies in the technical field of the nitrogen oxides (NOx) aftertreatment system by injection of an exhaust reagent (SCR system - used later - for "selective catalytic reduction" in English or selective catalytic reduction), a gasoline or diesel engine.
[ooo3] Le système SCR (expression utilisée par la suite - pour « sélective catalytic réduction » en anglais ou réduction catalytique sélective) est une des solutions possibles pour le post-traitement des dioxydes d'azote (NOx par la suite) sur moteur Diesel. Le principe d'un tel système est de réduire chimiquement les NOx en ajoutant un agent réducteur (NH3 - ammoniac) en amont d'un catalyseur SCR spécifique et ainsi de permettre à ce type de moteur de respecter des niveaux d'émissions de plus en plus strictes. [ooo3] The SCR system (expression used later - for "selective catalytic reduction" in English or selective catalytic reduction) is one of the possible solutions for the post-treatment of nitrogen dioxides (NOx thereafter) on diesel engine . The principle of such a system is to chemically reduce the NOx by adding a reducing agent (NH3 - ammonia) upstream of a specific SCR catalyst and thus to allow this type of engine to meet more emission levels. more strict.
[ooo4] La réduction des oxydes d'azote par l'ammoniac selon les réactions SCR est une méthode bien connue et largement utilisée dans l'industrie, notamment dans des usines stationnaires. Appliquée à l'automobile, la difficulté de la SCR est d'apporter dans l'échappement l'ammoniac nécessaire à la réduction des NOx. Il est nécessaire de stocker ce réducteur sur le véhicule. Pour cela, plusieurs concepts ont été développés pour embarquer l'ammoniac : sous forme d'urée solide, sous forme d'urée liquide en solution aqueuse, sous forme de carbamate d'ammonium, etc.... [ooo4] The reduction of nitrogen oxides by ammonia according to the SCR reactions is a well-known method and widely used in industry, especially in stationary plants. Applied to the automobile, the difficulty of the SCR is to bring into the exhaust the ammonia necessary for the reduction of NOx. It is necessary to store this gearbox on the vehicle. For this, several concepts have been developed for shipping ammonia: in the form of solid urea, in the form of liquid urea in aqueous solution, in the form of ammonium carbamate, etc.
[ooo5] Il existe aujourd'hui différentes stratégies pour le contrôle du système SCR. Il existe des systèmes comprenant un seul réservoir (ou cartouche) de réducteur et au moins un capteur de pression en amont du système d'injection. Il existe également des systèmes comprenant une grande cartouche, une plus petite (réservoirs ou cartouches « Main » et « Start-up ») et au moins un capteur de pression en amont du système d'injection. Il existe encore des systèmes comprenant deux cartouches, deux clapets anti-retour et au moins un capteur de pression en amont du système d'injection. Il existe en outre des systèmes comprenant deux grandes cartouches, une petite cartouche, deux clapets anti- retour et au moins un capteur de pression en amont du système d'injection. [ooo5] There are different strategies for controlling the SCR system today. There are systems comprising a single reservoir (or cartridge) gearbox and at least one pressure sensor upstream of the injection system. There are also systems including a large cartridge, a smaller one (tanks or cartridges "Main" and "Start-up") and at least one sensor. pressure upstream of the injection system. There are still systems comprising two cartridges, two check valves and at least one pressure sensor upstream of the injection system. There are also systems comprising two large cartridges, a small cartridge, two check valves and at least one pressure sensor upstream of the injection system.
[0006] Les documents US 2007 1 63245, WO 0601 2903, WO 07000170, WO08077626, DE1 02001024544, DE1 02008012543, EP1 977 817, EP 1 992 397, US 2001 053342, US 2004045284, WO 03090908 donnent des exemples de systèmes de systèmes de SCR avec réducteur gaz. [ooo7] Cependant, aucun de ces documents ne permet de détecter de manière simple le changement de la cartouche ou réservoir de réducteur. Il existe donc un besoin pour cela. US 2007 1 63245, WO 0601 2903, WO 07000170, WO08077626, DE1 02001024544, DE1 02008012543, EP1 977 817, EP 1 992 397, US 2001 053342, US 2004045284, WO 03090908 give examples of systems systems. SCR with gas reducer. [ooo7] However, none of these documents can detect in a simple way the change of the cartridge or gearbox tank. So there is a need for that.
[ooo8] Un des enjeux de tels systèmes est l'utilisation à bon escient des différentes cartouches de stockage de NH3 dans le cas d'un système à plusieurs cartouches. Le système de pilotage doit connaître quelle est la cartouche en cours d'utilisation. [ooo8] One of the challenges of such systems is the proper use of the different NH3 storage cartridges in the case of a multi-cartridge system. The control system must know which cartridge is in use.
[ooo9] Pour connaître la cartouche active qui est celle en cours d'utilisation, la stratégie de pilotage demande soit l'ajout de capteurs, soit l'ajout d'actionneurs (ex : électrovannes) supplémentaires au système. Ce qui a un coût et complexifie la solution. Il est donc souhaitable que la stratégie de contrôle utilise les capteurs et actionneurs déjà prévus dans le système et intègre des algorithmes de détection de cartouche en cours d'utilisation. Le problème est de devoir rendre le système indisponible pour réaliser la détection durant un temps trop long. [ooo9] To know which active cartridge is in use, the control strategy requires either the addition of sensors or the addition of additional actuators (eg solenoid valves) to the system. Which has a cost and complicates the solution. It is therefore desirable that the control strategy uses the sensors and actuators already provided in the system and incorporates cartridge detection algorithms in use. The problem is having to make the system unavailable to perform the detection for a long time.
[ooi o] Il existe donc un besoin en un procédé permettant de vérifier rapidement le changement de cartouche. [ooi o] There is therefore a need for a method to quickly check the cartridge change.
[ooi i] Pour cela, l'invention propose un procédé de validation de la détection d'un changement de cartouche de réducteur d'oxyde d'azote dans un système SCR comportant une pluralité de cartouches et des canalisations reliant les cartouches à un injecteur, caractérisé en ce que le procédé comprend - la réalisation d'une pluralité de chauffes au sein d'une première cartouche alimentant les canalisations , [Ooi i] For this, the invention provides a method for validating the detection of a nitrogen oxide reducer cartridge change in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector characterized in that the process comprises the production of a plurality of heaters within a first cartridge supplying the pipes,
- la réalisation d'au moins une chauffe d'une deuxième cartouche,  the production of at least one heating of a second cartridge,
- la détection de l'alimentation des canalisations par la deuxième cartouche,  the detection of the supply of the pipes by the second cartridge,
- la validation du changement de cartouche d'alimentation par la détection d'une augmentation de la pression dans les canalisations suite à la réalisation d'une chauffe au sein de la deuxième cartouche. - The validation of the supply cartridge change by detecting an increase in the pressure in the pipes following the completion of a heater in the second cartridge.
[0012] Selon une variante, le procédé comprend une temporisation avant de réaliser l'étape de validation, au cours de laquelle aucune chauffe n'est réalisée. [ooi 3] Selon une variante, si suite à la réalisation d'une chauffe au sein de la deuxième cartouche, une diminution de la pression est constatée, le changement de cartouche n'est pas validé. According to a variant, the method comprises a delay before performing the validation step, during which no heating is performed. [Ooi 3] According to a variant, if following the completion of a heater in the second cartridge, a decrease in pressure is found, the cartridge change is not validated.
[0014] l'invention propose aussi un procédé de détection d'un changement de cartouche d'un réducteur dans un système SCR comportant une pluralité de cartouches et des canalisations reliant les cartouches à un injecteur, caractérisé en ce que le procédé comprend The invention also proposes a method for detecting a cartridge change of a gearbox in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector, characterized in that the method comprises
- la régulation de la pression au sein d'une première cartouche alimentant les canalisations, la régulation comprenant des phases de montée en pression de la première cartouche,  the regulation of the pressure within a first cartridge supplying the pipes, the regulation comprising phases of pressure increase of the first cartridge,
- la montée en pression d'une deuxième cartouche - the increase in pressure of a second cartridge
- la détection de l'alimentation des canalisations par la deuxième cartouche par la détection d'une variation de la pression dans les canalisations alors que la première cartouche est en dehors d'une phase de montée en pression.  - Detecting the supply of pipes by the second cartridge by detecting a variation in the pressure in the pipes while the first cartridge is outside a pressure increase phase.
[ooi 5] Selon une variante, la montée en pression des cartouches est réalisée par la chauffe des cartouches.  [Ooi 5] According to one variant, the pressure increase of the cartridges is achieved by heating the cartridges.
[0016] Selon une variante, le système SCR comporte un organe de contrôle commande qui régule en pression les cartouches et assure la montée en pression des cartouches. According to one variant, the SCR system comprises a control element which regulates the cartridges in pressure and ensures the pressure rise of the cartridges.
[0017] Selon une variante, l'organe de contrôle commande régule en pression une cartouche à la fois. [0018] Selon une variante, après la validation de l'alimentation des canalisations par la deuxième cartouche, l'organe de contrôle régule la pression de la deuxième cartouche. According to one variant, the control control member regulates one cartridge at a time in pressure. According to a variant, after the validation of the supply of the pipes by the second cartridge, the control member regulates the pressure of the second cartridge.
[0019] Selon une variante, le procédé comprend en outre la mesure ou l'estimation de la pression dans les canalisations. Alternatively, the method further comprises measuring or estimating the pressure in the pipes.
[0020] Selon une variante, la pression dans les canalisations correspond à la pression de la cartouche ayant la plus grande pression. According to one variant, the pressure in the pipes corresponds to the pressure of the cartridge having the greatest pressure.
[0021 ] Selon une variante, le procédé comprend, au cours de la validation du changement d'alimentation, une augmentation de la dérivée de la pression dans les canalisations. According to a variant, the method comprises, during the validation of the supply change, an increase in the derivative of the pressure in the pipes.
[0022] L'invention se rapporte aussi à une ligne d'échappement caractérisée en ce qu'elle comprend : The invention also relates to an exhaust line characterized in that it comprises:
- une tuyauterie de gaz d'échappement,  - exhaust gas piping,
- un système SCR comportant une pluralité de cartouches et des canalisations reliant les cartouches à un injecteur de réducteur dans la tuyauterie de gaz d'échappement et  an SCR system comprising a plurality of cartridges and ducts connecting the cartridges to a reducer injector in the exhaust gas pipe and
- un organe de contrôle commande pour la mise en œuvre du procédé tel que décrit précédemment.  a control command member for implementing the method as described above.
[0023] L'invention se rapporte aussi à un véhicule caractérisé en ce qu'il comprend un moteur alimentant en gaz d'échappement une ligne d'échappement telle que décrite précédemment. The invention also relates to a vehicle characterized in that it comprises a motor supplying exhaust gas an exhaust line as described above.
[0024] D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit des modes de réalisation de l'invention, donnés à titre d'exemple uniquement et en références aux dessins qui montrent : - figure 1 , un schéma d'un système SCR ; Other features and advantages of the invention will appear on reading the following detailed description of the embodiments of the invention, given by way of example only and with reference to the drawings which show: FIG. 1 , a diagram of an SCR system;
- figures 2 et 3, des graphiques montrant des stratégies de validation de changement de cartouche. - Figures 2 and 3, graphs showing cartridge change validation strategies.
- La figure 4, des graphiques montrant la détection du changement de cartouche. [0025] L'invention se rapporte à un procédé de validation de la détection d'un changement de cartouche de réducteur d'oxyde d'azote dans un système SCR comportant une pluralité de cartouches et des canalisations reliant les cartouches à un injecteur. Le procédé comprend la réalisation d'une pluralité de chauffes au sein d'une première cartouche alimentant les canalisations, la réalisation d'au moins une chauffe d'une deuxième cartouche et la détection de l'alimentation des canalisations par la deuxième cartouche. Le procédé comprend en outre la validation du changement de cartouche d'alimentation par la détection d'une augmentation de la pression dans les canalisations suite à la réalisation d'une chauffe au sein de la deuxième cartouche. Le procédé permet de vérifier rapidement si la cartouche est convenablement changée. FIG. 4, graphs showing the detection of the cartridge change. The invention relates to a method for validating the detection of a change of nitrogen oxide reducing cartridge in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector. The method comprises producing a plurality of heaters within a first cartridge supplying the pipes, producing at least one heater of a second cartridge and detecting the supply of the pipes by the second cartridge. The method further includes enabling the supply cartridge change by detecting an increase in the pressure in the pipes as a result of heating within the second cartridge. The method makes it possible to quickly check whether the cartridge is suitably changed.
[0026] La figure 1 montre un système SCR 10. Le système 10 fait partie d'une ligne d'échappement comprenant une tuyauterie (non représentée) dans laquelle un réducteur est injecté par un injecteur (non représenté). Le système 10 comporte une unité de stockage composée de plusieurs réservoirs ou cartouches 12 (121 , 122, ... 12n) toutes reliées par des canalisations 14. Les canalisations 14 permettent l'acheminement du réducteur vers l'injecteur. Toutes les cartouches sont reliées par une canalisation 14 dont la pression est connue par mesure à l'aide d'un organe 16 d'information pression qui peut être un capteur ou une estimation. Chaque cartouche 12 est reliée à la canalisation 14 par zéro, un ou plusieurs clapets antiretour 18. Les clapets 18 sont facultatifs. Notamment, le système peut comporter une cartouche sans clapet anti-retour et une ou plusieurs cartouches avec un clapet anti-retour. Chaque cartouche est chauffée par un organe de chauffe 19 dédié. Le système SCR 10 comporte en outre un organe de contrôle commande permettant la mise en œuvre du procédé selon l'invention. Figure 1 shows an SCR system 10. The system 10 is part of an exhaust line comprising a pipe (not shown) in which a reducer is injected by an injector (not shown). The system 10 comprises a storage unit composed of several tanks or cartridges 12 (121, 122, ... 12n) all connected by pipes 14. The pipes 14 allow the transport of the reducer to the injector. All the cartridges are connected by a pipe 14 whose pressure is known by measurement with the aid of a pressure information member 16 which may be a sensor or an estimate. Each cartridge 12 is connected to the pipe 14 by zero, one or more non-return valves 18. The valves 18 are optional. In particular, the system may include a cartridge without non-return valve and one or more cartridges with a non-return valve. Each cartridge is heated by a dedicated heater 19. The SCR system 10 further comprises a control element for the implementation of the method according to the invention.
[0027] Les cartouches comprennent un solide enfermant un réducteur gazeux qui est libéré par déplacement de l'équilibre chimique, notamment par l'augmentation de la température du solide. La montée en pression des cartouches est donc par exemple obtenue par la chauffe des cartouches. L'élément de chauffe est par exemple un élément externe ou interne à la cartouche et peut être une résistance chauffante. Le solide est par exemple un sel de stockage tel que du chlorure de strontium. Le réducteur est par exemple de l'ammoniac en phase gaz. L'invention décrite est décrite pour une solution SCR ammoniac (gaz), mais peut s'appliquer à l'ensemble des concepts SCR sous forme gazeuse. L'avantage de la forme gazeuse est qu'elle nécessite moins d'énergie pour être libérée qu'un réducteur liquide. [0028] Le contrôle commande du système SCR comporte une régulation en pression des cartouches 12, la pression dans les cartouches n'étant pas connue, seule la pression des canalisations 14 étant connue. La régulation en pression des cartouches comprend des phases de montée en pression des cartouches par chauffe des cartouches 12. Les phases de montée en pression par chauffe sont alternées avec des phases sans chauffage impliquant une baisse de pression. The cartridges comprise a solid enclosing a gaseous reducing agent which is released by displacement of the chemical equilibrium, in particular by increasing the temperature of the solid. The pressure increase of the cartridges is for example obtained by heating the cartridges. The heating element is for example an external element or internal to the cartridge and may be a heating resistor. The solid is for example a storage salt such as strontium chloride. The reducing agent is, for example, ammonia in the gas phase. The invention described is described for an SCR ammonia (gas) solution, but can be applied to all SCR concepts in gaseous form. The advantage of the gaseous form is that it requires less energy to be released than a liquid reductant. The control system control SCR comprises a pressure regulation of the cartridges 12, the pressure in the cartridges are not known, only the pressure of the pipes 14 is known. The pressure regulation of the cartridges comprises phases of pressure increase of the cartridges by heating the cartridges 12. The pressure increase phases by heating are alternated with phases without heating involving a pressure drop.
[0029] Un réservoir ou cartouche est dit actif lorsque le gaz utilisé par le système vient de ce réservoir ou cartouche, c'est-à-dire quand son clapet-anti retour 18 est ouvert et met en communication le volume de la cartouche avec la canalisation. Pour le bon fonctionnement du système deux cartouches ne seront pas actives en même temps, sauf lors de brefs moments durant le changement de cartouche active. A tank or cartridge is said to be active when the gas used by the system comes from the tank or cartridge, that is to say when its check valve 18 is open and puts in communication the volume of the cartridge with the pipeline. For the proper functioning of the system two cartridges will not be active at the same time, except for brief moments during the active cartridge change.
[0030] La stratégie ou procédé de validation du changement de cartouche 12 active est de détecter une augmentation de la pression caractéristique de la chauffe de la cartouche active. Pour cela, il faut au préalable avoir détecté le changement de cartouche active. Puis, de préférence, il faut ne pas avoir chauffé un certain temps les deux cartouches pour ne pas avoir de fausse détection lors du test de validation. Le test de validation consiste en la chauffe de la cartouche supposée active et la détection d'une augmentation de la pression dans les canalisations qui viendrait de l'augmentation de la pression dans la cartouche elle-même. [0031 ] La stratégie ou procédé peut se décomposer en trois phases. La phase 1 est la phase entre le début du changement de cartouche active et la détection du changement de cartouche active. La phase 2 est la phase de préparation du système pour le test de validation. La phase 3 est la phase du test de validation terminée par la confirmation ou l'infirmation du changement de cartouche active. [0032] Selon les figures 2 et 3, alors qu'une pluralité de chauffes 30 est réalisée au sein de la cartouche active 1 , un changement de cartouche active a été demandé selon la phase 1 . Pour cela, la cartouche 2 est chauffée selon 32 sur les figures 2 et 3 durant cette phase afin que sa pression interne augmente et dépasse la pression dans la canalisation qui est celle de la cartouche 1 . La cartouche 2 peut subir une ou plusieurs chauffes. La phase 1 se termine avec la détection 34 que la cartouche 2 a une pression interne supérieure à celle de la cartouche 1 et que c'est maintenant la cartouche 2 qui fait la pression dans la canalisation. Ceci est par exemple détecté par la détection du dépassement d'un seuil de pression au sein de la cartouche ou alors par la détection d'une variation de la pression dans les canalisations alors que la première cartouche est en dehors d'une phase de montée en pression. The strategy or method of validating the cartridge change 12 active is to detect an increase in the pressure characteristic of the heating of the active cartridge. For this, you must first have detected the change of active cartridge. Then, preferably, it is necessary not to have heated some time the two cartridges to not have false detection during the validation test. The validation test consists in heating the supposed active cartridge and detecting an increase in the pressure in the pipes that would come from the increase of the pressure in the cartridge itself. The strategy or process can be broken down into three phases. Phase 1 is the phase between the beginning of the active cartridge change and the detection of the active cartridge change. Phase 2 is the system preparation phase for the validation test. Phase 3 is the phase of the validation test completed by the confirmation or denial of the active cartridge change. According to Figures 2 and 3, while a plurality of heaters 30 is formed within the active cartridge 1, an active cartridge change was requested according to phase 1. For this, the cartridge 2 is heated according to 32 in Figures 2 and 3 during this phase so that its internal pressure increases and exceeds the pressure in the pipe which is that of the cartridge 1. The cartridge 2 may undergo one or more heat. The phase 1 ends with the detection 34 that the cartridge 2 has an internal pressure greater than that of the cartridge 1 and that it is now the cartridge 2 which is the pressure in the pipe. This is for example detected by the detection of the exceeding of a pressure threshold within the cartridge or by the detection of a variation of the pressure in the pipes while the first cartridge is outside of a rising phase. in pressure.
[0033] Toutefois, cette détection n'est pas toujours robuste dans certain cas de vie ; de ce fait, il est préférable de mettre en œuvre une stratégie de validation du changement de cartouche. However, this detection is not always robust in certain cases of life; therefore, it is best to implement a cartridge change validation strategy.
[0034] Lors de la phase 2, le système 10 peut être préparé pour être dans les bonnes conditions initiales pour réaliser le test de validation. Ainsi, aucune des cartouches n'est chauffée pendant une durée qui permet d'être sûr que toute augmentation de la pression dans les canalisations 14 sera le résultat de la chauffe de la phase 3, et non d'une chauffe antérieure. La pression à la fin de la phase 2 est donc décroissante. In phase 2, the system 10 may be prepared to be in the right initial conditions to perform the validation test. Thus, none of the cartridges is heated for a period of time which makes it possible to be sure that any increase in the pressure in the pipes 14 will be the result of the heating of the phase 3, and not of an earlier heating. The pressure at the end of phase 2 is decreasing.
[0035] La phase 3 est celle du test de validation. La cartouche 2 supposée active est chauffée durant un temps donné 36 ce qui doit entraîner une augmentation de la pression dans les canalisations 14. Cette chauffe est de préférence dosée afin de garantir la validation, mais ne pas entraîner une augmentation trop importante de la pression du système. Phase 3 is that of the validation test. The cartridge 2 supposed to be active is heated for a given time 36, which must cause an increase in the pressure in the pipes 14. This heating is preferably metered in order to guarantee the validation, but does not cause an excessive increase in the pressure of the system.
[0036] Il y a alors deux possibilités. Soit la pression augmente comme prévu. Il s'agit alors bien de la cartouche 2 qui est active. Ceci est le cas de la figure 2 ou l'on constate une augmentation 38 de la pression. La figure 2 correspond à une validation du changement de cartouche 1 vers 2. Soit la pression continue de descendre. Il s'agit alors toujours de la cartouche 1 qui est active. Ceci est le cas de la figure 3 ou l'on constate une diminution 38 de la pression. There are then two possibilities. Either the pressure increases as expected. This is then the cartridge 2 which is active. This is the case of FIG. 2 where an increase in pressure is observed. Figure 2 corresponds to a validation of cartridge change 1 to 2. That is the continuous pressure of go down. This is always the cartridge 1 that is active. This is the case of Figure 3 where there is a decrease 38 of the pressure.
[0037] Il est en outre possible, lors du test de validation, de détecter l'augmentation de la dérivée de la pression après la chauffe de la phase 3. Il n'est donc pas nécessaire d'attendre que la pression soit décroissante à la fin de la phase 2. Ceci permet de valider plus rapidement le changement de cartouche. It is also possible, during the validation test, to detect the increase of the derivative of the pressure after heating phase 3. It is therefore not necessary to wait until the pressure is decreasing at the end of phase 2. This makes it possible to validate the cartridge change more quickly.
[0038] Le procédé met donc en œuvre une architecture de capteurs et d'actionneurs permettant la maîtrise et la réalisation de la quantité de réducteur gazeux injectée. Ce procédé ne nécessite pas de mode spécifique de fonctionnement provoquant une perte de temps lors de la validation du changement de cartouche. Le gain est technique en termes de disponibilité du système, car la validation du changement de cartouche active permet de garantir une bonne régulation de la pression du système sans écart trop important à la consigne et donc la disponibilité de l'injection de gaz vers l'échappement. [0039] L'invention se rapporte encore à un procédé de détection d'un changement de cartouche d'un réducteur dans un système SCR comportant une pluralité de cartouches et des canalisations reliant les cartouches à un injecteur. Le procédé comprend la régulation de la pression au sein d'une première cartouche alimentant les canalisations, la régulation comprenant des phases de montée en pression de la première cartouche, la montée en pression d'une deuxième cartouche, la détection de l'alimentation des canalisations par la deuxième cartouche par la détection d'une variation de la pression dans les canalisations alors que la première cartouche est en dehors d'une phase de montée en pression. Cette invention permet de détecter de manière simple le changement de la cartouche active à l'aide de l'information de pression des canalisations seulement. Il n'est donc pas nécessaire d'ajouter des capteurs de pression afin de connaître la pression dans les cartouches. En outre, ceci permet d'éviter une surconsommation électrique qui peut se produire dans les dispositifs de l'art antérieur. The method therefore implements an architecture of sensors and actuators for controlling and achieving the amount of gaseous reductant injected. This method does not require a specific mode of operation causing a loss of time during the validation of the cartridge change. The gain is technical in terms of the availability of the system, because the validation of the active cartridge change makes it possible to guarantee a good regulation of the pressure of the system without too much deviation from the set point and thus the availability of the injection of gas towards the exhaust. The invention also relates to a method of detecting a cartridge change of a reducer in an SCR system comprising a plurality of cartridges and pipes connecting the cartridges to an injector. The method comprises the regulation of the pressure within a first cartridge supplying the pipes, the regulation comprising phases of pressure increase of the first cartridge, the pressure increase of a second cartridge, the detection of the supply of the pipes by the second cartridge by detecting a variation of the pressure in the pipes while the first cartridge is outside a pressure increase phase. This invention makes it possible to detect in a simple manner the change of the active cartridge using the pressure information of the pipes only. It is therefore not necessary to add pressure sensors to know the pressure in the cartridges. In addition, this avoids over-consumption that can occur in electrical devices of the prior art.
[0040] On considère que la cartouche active est celle qui met en pression les canalisations 14. Lorsque l'organe de contrôle commande souhaite changer de cartouche active, il continue la régulation en pression de la cartouche actuellement active (première cartouche) afin d'assurer les prestations fonctionnelles du système et monte en pression la cartouche prochainement active (deuxième cartouche) jusqu'à détecter une variation significative de la pression alors même que la première cartouche est en dehors d'une phase de montée en pression, c'est-à-dire dans une phase ou la première cartouche n'est pas chauffée. Cette variation correspond au changement effectif de la cartouche active. La cartouche qui montait en pression devient la cartouche active. It is considered that the active cartridge is the one that presses the pipes 14. When the control member wishes to change the active cartridge, it continues the pressure control of the cartridge currently active (first cartridge) to ensure the functional performance of the system and pressurizes the cartridge soon active (second cartridge) until detect a significant variation in pressure even though the first cartridge is outside a phase of rise in pressure, that is to say in a phase where the first cartridge is not heated. This variation corresponds to the actual change of the active cartridge. The cartridge that was rising in pressure becomes the active cartridge.
[0041 ] Le système SCR comporte plusieurs cartouches 12 mais l'organe de contrôle commande ne peut réguler qu'une seule cartouche 12 à la fois car les pressions des cartouches ne sont pas connues, seule la pression dans les canalisations 14 étant connue. Tout au plus, l'organe peut monter en pression une cartouche tout en régulant une autre en pression. La pression dans les canalisations 14 correspond toujours à la pression de la cartouche 12 ayant la plus grande pression (différence de pression ΔΡ du/des clapet(s) 18 inclus). La cartouche active est celle qui met en pression les canalisations. The SCR system comprises several cartridges 12 but the control member can regulate only one cartridge 12 at a time because the cartridge pressures are not known, only the pressure in the pipes 14 is known. At most, the member can pressurize a cartridge while regulating another pressure. The pressure in the pipes 14 always corresponds to the pressure of the cartridge 12 having the greatest pressure (pressure difference ΔΡ of the valve (s) 18 included). The active cartridge is the one that presses the pipes.
[0042] La variation significative peut être l'accélération de la pression dans les canalisations 14. La chauffe de la cartouche active provoque toujours une accélération positive de la pression. Lorsqu'une accélération positive est détectée alors que la cartouche active n'a pas été chauffée, cette accélération est alors due à la chauffe de la cartouche qui montait en pression et qui devient ainsi active. The significant variation can be the acceleration of the pressure in the pipes 14. The heating of the active cartridge always causes a positive acceleration of the pressure. When a positive acceleration is detected while the active cartridge has not been heated, this acceleration is then due to the heating of the cartridge which rose in pressure and which becomes active.
[0043] La figure 4 montre la détection de la variation de la pression dans les canalisations. La figure 4 montre un graphique en haut relatif à la variation de pression dans les canalisations. La figure 4 montre en dessous un graphique relatif à l'accélération de la pression dans les canalisations. La figure 4 montre encore en dessous un graphique relatif à la mise en pression de la première cartouche 1 qui est celle active. La figure 4 montre un graphique en bas relatif à la mise en pression de la deuxième cartouche 2 qui est destinée à remplacer la cartouche 1 comme cartouche active. Le temps est représenté en abscisse des graphiques. Figure 4 shows the detection of the variation of the pressure in the pipes. Figure 4 shows a graph at the top of the pressure variation in the pipelines. Figure 4 shows below a graph relating to the acceleration of the pressure in the pipes. Figure 4 still shows below a graph relating to the pressurization of the first cartridge 1 which is the active one. FIG. 4 shows a bottom chart relating to the pressurization of the second cartridge 2 which is intended to replace the cartridge 1 as an active cartridge. Time is represented on the abscissa of the graphs.
[0044] L'organe de contrôle commande régule la pression via la cartouche 1 et souhaite que la cartouche 2 devienne la cartouche active. [0045] Les flèches 40 et 42 montrent une accélération positive qui est détectée quelques secondes après la chauffe de la cartouche 1 . En d'autres termes, le chauffage de la cartouche 1 est mis sur « on » et la cartouche est chauffée. Ceci se traduit par une accélération de la pression visible par deux pics sur le deuxième graphique en partant de celui du haut. La flèche 44 montre une accélération positive qui est détectée alors que la cartouche 1 n'a pas été chauffée. Cette accélération est due à la mise en pression de la cartouche 2 obtenue par la chauffe de la cartouche dont le chauffage est mis sur « on ». Cette accélération signifie que la cartouche 2 devient active et qu'à présent le contrôle commande peut donc réguler la pression sur la cartouche 2. The control control member regulates the pressure via the cartridge 1 and wants the cartridge 2 to become the active cartridge. The arrows 40 and 42 show a positive acceleration which is detected a few seconds after the heating of the cartridge 1. In other words, the heating of the cartridge 1 is turned on and the cartridge is heated. This results in an acceleration of the pressure visible by two peaks on the second graph from the top. The arrow 44 shows a positive acceleration which is detected while the cartridge 1 has not been heated. This acceleration is due to the pressurization of the cartridge 2 obtained by heating the cartridge whose heating is turned on. This acceleration means that the cartridge 2 becomes active and that the control command can therefore regulate the pressure on the cartridge 2.
[0046] Dans ce cas il n'est pas nécessaire que la pression soit décroissante à la fin de la phase 2 (fig. 2 ou 3). In this case it is not necessary for the pressure to be decreasing at the end of the phase 2 (FIG 2 or 3).
[0047] L'invention se rapporte aussi à un véhicule comprenant un moteur alimentant en gaz d'échappement une ligne d'échappement. La ligne comprend la tuyauterie de gaz d'échappement, le système SCR 10 comportant une pluralité de cartouches 12 et les canalisations 14 reliant les cartouches à un injecteur de réducteur dans la tuyauterie de gaz d'échappement. La ligne comprend aussi l'organe de contrôle commande pour la mise en œuvre du procédé de détection de changement de cartouche de réducteur. The invention also relates to a vehicle comprising a motor supplying exhaust gas to an exhaust line. The line includes the exhaust piping, the SCR system 10 having a plurality of cartridges 12 and the lines 14 connecting the cartridges to a reducer injector in the exhaust pipe. The line also comprises the control element for the implementation of the gearbox cartridge change detection method.

Claims

REVENDICATIONS
1. Procédé de validation de la détection d'un changement de cartouche (12) de réducteur d'oxyde d'azote dans un système SCR (10) comportant une pluralité de cartouches (12) et des canalisations (14) reliant les cartouches à un injecteur, caractérisé en ce que le procédé comprend A method of enabling detection of a change in nitrogen oxide reducing cartridge (12) in an SCR system (10) having a plurality of cartridges (12) and lines (14) connecting the cartridges to an injector, characterized in that the method comprises
- la réalisation d'une pluralité de chauffes au sein d'une première cartouche (1 ) alimentant les canalisations ,  the production of a plurality of heaters within a first cartridge (1) supplying the pipes,
- la réalisation d'au moins une chauffe d'une deuxième cartouche (2),  the production of at least one heating of a second cartridge (2),
- la détection de l'alimentation des canalisations par la deuxième cartouche (2),the detection of the supply of the pipes by the second cartridge (2),
- la validation du changement de cartouche d'alimentation par la détection d'une augmentation de la pression dans les canalisations suite à la réalisation d'une chauffe au sein de la deuxième cartouche (2). - The validation of the supply cartridge change by detecting an increase in the pressure in the pipes following the completion of a heater in the second cartridge (2).
2. Le procédé selon la revendication 1 , caractérisé en ce que le procédé comprend une temporisation avant de réaliser l'étape de validation, au cours de laquelle aucune chauffe n'est réalisée. 2. The method of claim 1, characterized in that the method comprises a time delay before performing the validation step, during which no heating is performed.
3. Le procédé selon l'une des revendications 1 ou 2, caractérisé en ce que, si suite à la réalisation d'une chauffe au sein de la deuxième cartouche (2), une diminution de la pression est constatée, le changement de cartouche n'est pas validé. 3. The method according to one of claims 1 or 2, characterized in that, if following the completion of a heating in the second cartridge (2), a decrease in pressure is noted, the cartridge change Is not valid.
4. Procédé de détection d'un changement de cartouche d'un réducteur dans un système SCR (10) comportant une pluralité de cartouches (12) et des canalisations (14) reliant les cartouches à un injecteur, caractérisé en ce que le procédé comprend A method of detecting a cartridge change of a reducer in an SCR system (10) having a plurality of cartridges (12) and lines (14) connecting the cartridges to an injector, characterized in that the method comprises
- la régulation de la pression au sein d'une première cartouche alimentant les canalisations (14), la régulation comprenant des phases de montée en pression de la première cartouche, the regulation of the pressure within a first cartridge supplying the pipes (14), the regulation comprising phases of increase in pressure of the first cartridge,
- la montée en pression d'une deuxième cartouche  - the increase in pressure of a second cartridge
- la détection de l'alimentation des canalisations par la deuxième cartouche par la détection d'une variation de la pression dans les canalisations alors que la première cartouche est en dehors d'une phase de montée en pression.  - Detecting the supply of pipes by the second cartridge by detecting a variation in the pressure in the pipes while the first cartridge is outside a pressure increase phase.
5. Le procédé selon la revendication 4, caractérisé en ce que la montée en pression des cartouches est réalisée par la chauffe des cartouches. 5. The method according to claim 4, characterized in that the pressure increase of the cartridges is achieved by heating the cartridges.
6. Le procédé selon la revendication 4 ou la revendication 5, caractérisé en ce que le système SCR comporte un organe de contrôle commande qui régule en pression les cartouches (12) et assure la montée en pression des cartouches. 6. The method of claim 4 or claim 5, characterized in that the SCR system comprises a control member which regulates pressure cartridges (12) and ensures the pressure rise of the cartridges.
7. Le procédé selon la revendication 6, caractérisé en ce que l'organe de contrôle commande régule en pression une cartouche (12) à la fois. 7. The method according to claim 6, characterized in that the control control member pressure regulates a cartridge (12) at a time.
8. Le procédé selon la revendication 6 ou la revendication 7, caractérisé en ce que, après la validation de l'alimentation des canalisations par la deuxième cartouche, l'organe de contrôle régule la pression de la deuxième cartouche. 8. The method of claim 6 or claim 7, characterized in that, after the validation of the supply of the pipes by the second cartridge, the control member regulates the pressure of the second cartridge.
9. Le procédé selon l'une des revendications précédentes, caractérisé en ce que le procédé comprend en outre la mesure ou l'estimation de la pression dans les canalisations. 9. The method according to one of the preceding claims, characterized in that the method further comprises measuring or estimating the pressure in the pipes.
10. Le procédé selon l'une des revendications précédentes, caractérisé en ce que la pression dans les canalisations correspond à la pression de la cartouche ayant la plus grande pression. 10. The method according to one of the preceding claims, characterized in that the pressure in the pipes corresponds to the pressure of the cartridge having the largest pressure.
11. Le procédé selon l'une des revendications précédentes, caractérisé en ce que le procédé comprend, au cours de la validation du changement d'alimentation, une augmentation de la dérivée de la pression dans les canalisations. 11. The method according to one of the preceding claims, characterized in that the method comprises, during the validation of the supply change, an increase in the derivative of the pressure in the pipes.
12. Une ligne d'échappement caractérisée en ce qu'elle comprend : 12. An exhaust line characterized in that it comprises:
- une tuyauterie de gaz d'échappement,  - exhaust gas piping,
- un système SCR comportant une pluralité de cartouches et des canalisations reliant les cartouches à un injecteur de réducteur dans la tuyauterie de gaz d'échappement et an SCR system comprising a plurality of cartridges and ducts connecting the cartridges to a reducer injector in the exhaust gas pipe and
- un organe de contrôle commande pour la mise en œuvre du procédé selon l'une des revendications précédentes.  a control control member for implementing the method according to one of the preceding claims.
13. Un véhicule caractérisé en ce qu'il comprend un moteur alimentant en gaz d'échappement une ligne d'échappement selon la revendication 12. 13. A vehicle characterized in that it comprises a motor supplying exhaust gas an exhaust line according to claim 12.
PCT/FR2012/050608 2011-04-20 2012-03-23 Method for validating and detecting a change of reducing agent cannister in an scr system, exhaust line and vehicle WO2012143633A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12717795.4A EP2699773A1 (en) 2011-04-20 2012-03-23 Method for validating and detecting a change of reducing agent cannister in an scr system, exhaust line and vehicle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR1153416A FR2974388B1 (en) 2011-04-20 2011-04-20 METHOD FOR VALIDATING CHANGE OF REDUCER CARTRIDGE IN SCR SYSTEM, EXHAUST LINE AND VEHICLE
FR1153432 2011-04-20
FR1153432A FR2974390B1 (en) 2011-04-20 2011-04-20 METHOD FOR DETECTING CHANGE OF REDUCER CARTRIDGE IN SCR SYSTEM, EXHAUST LINE AND VEHICLE
FR1153416 2011-04-20

Publications (1)

Publication Number Publication Date
WO2012143633A1 true WO2012143633A1 (en) 2012-10-26

Family

ID=46022481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2012/050608 WO2012143633A1 (en) 2011-04-20 2012-03-23 Method for validating and detecting a change of reducing agent cannister in an scr system, exhaust line and vehicle

Country Status (2)

Country Link
EP (1) EP2699773A1 (en)
WO (1) WO2012143633A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199097A1 (en) * 2000-10-19 2002-04-24 Hydraulik-Ring GmbH Device for treating an exhaust gas from a diesel engine
EP1199449A2 (en) * 2000-10-20 2002-04-24 MESSER GRIESHEIM GmbH Use of liquid ammonia in exhaust catalyst systems of internal combustion engines
WO2003090908A1 (en) * 2002-04-25 2003-11-06 Daimlerchrysler Ag Aftertreatment installation for exhaust gas and method for filling a reducing agent reservoir
EP1977817A1 (en) * 2007-03-30 2008-10-08 Amminex A/S A system for storing ammonia in and releasing ammonia from a storage material and method for storing and releasing ammonia

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199097A1 (en) * 2000-10-19 2002-04-24 Hydraulik-Ring GmbH Device for treating an exhaust gas from a diesel engine
EP1199449A2 (en) * 2000-10-20 2002-04-24 MESSER GRIESHEIM GmbH Use of liquid ammonia in exhaust catalyst systems of internal combustion engines
WO2003090908A1 (en) * 2002-04-25 2003-11-06 Daimlerchrysler Ag Aftertreatment installation for exhaust gas and method for filling a reducing agent reservoir
EP1977817A1 (en) * 2007-03-30 2008-10-08 Amminex A/S A system for storing ammonia in and releasing ammonia from a storage material and method for storing and releasing ammonia

Also Published As

Publication number Publication date
EP2699773A1 (en) 2014-02-26

Similar Documents

Publication Publication Date Title
EP2447495B1 (en) Method for controlling a selective catalytic reduction system for a vehicle and corresponding vehicle
WO2011148814A1 (en) Selective catalytic reduction system
FR3043429A1 (en) METHOD FOR MANAGING A SCR CATALYST SYSTEM OF AN INTERNAL COMBUSTION ENGINE
JP2008133780A (en) Device and method for diagnosing abnormality of nox sensor
WO2013127502A1 (en) Method for calculating the no2 level at the inlet to a selective catalytic reduction catalytic converter, and device for implementing this method
EP2558693A1 (en) Purge phase control strategy for a selected catalytic reduction system
FR2972489A1 (en) Method for estimating concentration of e.g. urea in nitrogen oxide reducing solution of selective catalytic reduction system for vehicle, involves determining correction factor of concentration of agent and estimating concentration
FR2981689A1 (en) Method for purging injection system for injecting liquid agent in exhaust line of car, involves performing gas aspiration process in outer side of pipe, and detecting specific pressure change in pipe of injector during purging
EP2699773A1 (en) Method for validating and detecting a change of reducing agent cannister in an scr system, exhaust line and vehicle
EP2966275B1 (en) Exhaust gas purification device of a motor vehicle engine comprising a selective catalytic reduction catalyst
FR2974388A1 (en) Method for validating detection of change of ammonia gas cartridge in selective catalytic reduction system of exhaust line for diesel engine of vehicle, involves validating change of cartridge by detecting increase in pressure in pipes
EP2917529B1 (en) Exhaust gas purification device with controlled injection of reducing agent
EP2699774B1 (en) Method for detecting a change of reducing agent canister in an scr system, exhaust line and vehicle
FR2965856A1 (en) METHOD FOR CONTROLLING THE OPERATION OF AN EXHAUST GAS POST-TREATMENT SYSTEM OF AN ENGINE AND VEHICLE ADAPTED FOR THE IMPLEMENTATION OF THE METHOD
FR2923533A1 (en) EXHAUST GAS PURIFYING APPARATUS FOR INTERNAL COMBUSTION ENGINE
FR2974390A1 (en) Method for detecting change of e.g. ammonia gas cartridge in selective catalytic reduction system of exhaust line of vehicle, involves detecting reducing agent supplied to pipes by cartridge by detection of pressure change in pipes
JP2007255289A (en) Exhaust emission control system of internal combustion engine
EP3425183A1 (en) Method for determining the change of state without the presence of liquid water in an exhaust line comprising a pollutant-removal member
FR3000988A1 (en) METHOD FOR MONITORING PRESSURE IN A TRANSFER AND DOSING SYSTEM
US20240167409A1 (en) Method for emptying an scr supply system
EP2453116B1 (en) Method for checking the activation of a selective catalytic reduction system
US20220195956A1 (en) Methods and systems for nox offset diagnostic
EP2944778B1 (en) Method for controlling the polluting emissions of an internal combustion engine
Korpics et al. Methods and systems for NO x offset diagnostic
EP2694786A1 (en) Method for determining the duration for which an orifice is open

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12717795

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2012717795

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE