SE1450858A1 - System and method for performance control of a DOC unit exhaust gas purification system - Google Patents

System and method for performance control of a DOC unit exhaust gas purification system Download PDF

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SE1450858A1
SE1450858A1 SE1450858A SE1450858A SE1450858A1 SE 1450858 A1 SE1450858 A1 SE 1450858A1 SE 1450858 A SE1450858 A SE 1450858A SE 1450858 A SE1450858 A SE 1450858A SE 1450858 A1 SE1450858 A1 SE 1450858A1
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content
determined
scr catalyst
doc unit
unit
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SE1450858A
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SE538317C2 (en
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Mikael Lundström
Magnus Fröberg
Ola Stenlåås
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Scania Cv Ab
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Priority to SE1450858A priority Critical patent/SE538317C2/en
Priority to DE102015007751.1A priority patent/DE102015007751A1/en
Publication of SE1450858A1 publication Critical patent/SE1450858A1/en
Publication of SE538317C2 publication Critical patent/SE538317C2/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1402—Exhaust gas composition
    • 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
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1614—NOx amount trapped in catalyst
    • 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
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1621—Catalyst conversion efficiency
    • 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
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1622—Catalyst reducing agent absorption capacity or consumption amount
    • 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

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  • 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)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

SAMMANDRAG Uppfinningen hanfor sig till ett forfarande vid ett forfarande for prestandakontroll av en DOC-enhet (260) has ett avgasreningssystem innefattande en forsta NOR-sensor 5 (237) uppstroms namnda DOC-enhet (260) och en SCR-katalysator (270) nedstrams namnda DOC-enhet (260). Forfarandet kan inbegripa stegen att: - i huvudsak tomma (s410) namnda SCR-katalysator (270) pa reduktionsmedel; - faststalla (s420) en forsta NO2-halt (NO2mod) has avgaserna pa basis av en faststalld NOR-halt uppstroms namnda DOC-enhet (260) och en faststalld omvandlingsgrad (X) rorande omvandling till NO2 has avgasreningssystemet uppstroms namnda SCR-katalysator (270); - faststalla (s430) en andra NO2-halt (NO2measured) has avgaserna pa basis av en medelst en korskanslig NH3-sensor (278) faststalld NH3-halt (NH3measured) och en korskanslighetsfunktion (F) rorande NO2 for namnda NH3-sensor (278); och - bedoma prestanda (s440) has namnda DOC-enhet (260) pa basis av namnda faststallda forsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured). Uppfinningen avser ocksa en datorprogramprodukt innefattande programkod (P) for 20 en dator (200; 210) for att implementera ett forfarande enligt uppfinningen. Uppfinningen avser ocksa ett system for prestandakontroll av en DOC-enhet (260) och ett motorfordon (100) som är utrustat med systemet. SUMMARY The invention relates to a process in a process for controlling the performance of a DOC unit (260) having an exhaust gas purification system comprising a first NOR sensor 5 (237) upstream of said DOC unit (260) and an SCR catalyst (270) downstream said DOC unit (260). The process may comprise the steps of: - substantially emptying (s410) said SCR catalyst (270) on reducing agent; - determining (s420) a first NO2 content (NO2mod) has the exhaust gases on the basis of a determined NOR content upstream of said DOC unit (260) and a determined conversion rate (X) concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst ( 270); - determining (s430) a second NO2 content (NO2measured) has the exhaust gases on the basis of a NH3 content (NH3measured) determined by means of a cross-sensitive NH3 sensor (278) and a NO2-measured cross-function function (F) for said NH3 sensor (278 ); and - assessing performance (s440) has said DOC unit (260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured). The invention also relates to a computer program product comprising program code (P) for a computer (200; 210) for implementing a method according to the invention. The invention also relates to a system for performance control of a DOC unit (260) and a motor vehicle (100) equipped with the system.

Description

1 System och forfarande for prestandakontroll av en DOC-enhet hos ett avgasreningssystem TEKNISKT OMRADE Foreliggande uppfinning avser ett forfarande for prestandakontroll av en DOC-enhet has ett avgasreningssystem. Uppfinningen avser ocksa en datorprogramprodukt innefattande programkod for en dator for att implementera ett forfarande enligt uppfinningen. Uppfinningen avser ocksa ett system fOr prestandakontroll av en DOC- enhet has ett avgasreningssystem samt ett motorfordon som är utrustat med system et. TECHNICAL FIELD The present invention relates to a method for performance control of a DOC unit having an exhaust gas purification system. The invention also relates to a computer program product comprising program code for a computer for implementing a method according to the invention. The invention also relates to a system for performance control of a DOC unit having an exhaust gas purification system and a motor vehicle equipped with the system.

BAKGRUND Avgasreningssystem has motorfordon av idag inbegriper ett antal olika komponenter. BACKGROUND Exhaust gas cleaning systems of today's motor vehicles include a number of different components.

Exempelvis kan ett avgasreningssystem inbegripa en DOC-enhet (Diesel Oxidation Catalyst) anordnad i en passage nedstroms en forbranningsmotor has fordonet. Andra komponenter som kan vara anordnade nedstroms namnda motor är en DPFenhet (Diesel Particulate Filter) och en SCR-katalysator (Selective Catalytic 2oReduction). For example, an exhaust gas purification system may include a DOC unit (Diesel Oxidation Catalyst) arranged in a passage downstream of an internal combustion engine has the vehicle. Other components that may be arranged downstream of said engine are a DPF unit (Diesel Particulate Filter) and a SCR catalyst (Selective Catalytic 2oReduction).

Det är av manga orsaker onskvart att kunna utfora prestandakontroll av enskilda komponenter has avgasreningssystem has motorfordon, sasom exempelvis lastbilar och bussar. Prestandakontroll av komponenter has avgasreningssystem has motorfordon kan exempelvis vara onskvard for att kunna faststalla radande prestanda och/eller funktion has de olika komponenterna. Prestandakontroll av enskilda komponenter i avgasreningssystem kan i vissa stater vara understalld lagar, regelverk eller direktiv, vilket naturligtvis fordonstillverkare maste forhalla sig till, inte minst ur ett konkurrensperspektiv. For many reasons, it is unfortunate to be able to perform performance checks on individual components of exhaust gas cleaning systems and motor vehicles, such as trucks and buses. Performance control of components has exhaust gas purification systems has motor vehicles can, for example, be necessary to be able to determine radiating performance and / or function has the various components. Performance control of individual components in exhaust gas cleaning systems may in some states be subject to laws, regulations or directives, which of course vehicle manufacturers must adhere to, not least from a competition perspective.

Namnda DOC-enhet är anordnad att oxidera NO-gas fran en motor till NO2-gas. Om namnda DOC-enhet pa nagot vis kan en mindre mangd NO-gas an vad som är erforderligt och onskvart omvandlas till NO2-gas. Det kan i vissa applikationer vara onskvart att namnda DOC-enhet har en omvandlingsgrad som ligger i ett intervall 2 mellan 40-60%. Om DOC-enheten harvid uppvisar en forsamrad prestanda och exempelvis endast har en omvandlingsgrad am 30% eller lagre kan denna behovas rengoras, repareras, eller bytas ut. Detta är naturligtvis forknippat med olika slags kostnader, inte minst avseende material och arbetstid for servicepersonal. Said DOC unit is arranged to oxidize NO gas from an engine to NO2 gas. If the said DOC unit in some way, a smaller amount of NO gas than what is required and unwanted can be converted to NO2 gas. In some applications it may be undesirable that the DOC unit has a degree of conversion which is in a range 2 between 40-60%. If the DOC unit has a pre-assembled performance and, for example, only has a conversion rate of 30% or less, this may need to be cleaned, repaired, or replaced. This is of course associated with different types of costs, not least in terms of materials and working hours for service personnel.

En degradering av prestanda hos namnda DOC-enhet kan uppsta av flera olika orsaker. A degradation of performance of the said DOC unit can occur for several different reasons.

FOr de fall namnda motorfordon är utrustad med ett turboaggregat kan exempelvis metalldelar, sasom flisor eller span, lossna och toms med en avgasstrom Iran motorn till DOC-enheten och harvid skada densamma, vilket orsakar en degradering av prestanda has DOC-enheten. In cases where the said motor vehicle is equipped with a turbocharger, for example, metal parts, such as chips or spans, can come loose and toms with an exhaust stream Iran the engine to the DOC unit and thereby damage it, which causes a degradation of performance has the DOC unit.

Vidare kan bransle Iran motor och/eller smorjmedel for motorn och/eller smorjmedel for ett turboaggregat tillforas namnda DOC-enhet och harvid orsaka degradering av prestanda has densamma. Furthermore, the Iran engine and / or engine lubricant and / or lubricant for a turbocharger may be supplied to said DOC unit and thereby cause degradation of performance has the same.

For de fall namnda motor drivs medel etanol, kan detta drivmedel blandas med sot och tillforas namnda DOC-enhet, varvid degradering av prestanda has densamma 20 kan orsakas. In cases where said engine is driven by ethanol, this fuel can be mixed with soot and fed to said DOC unit, whereby degradation of performance has the same can be caused.

Prestandakontroll av namnda DOC-enhet kan idag endast utforas under vissa specifika forhallanden och drifttillstand has fordonet. I de fiesta fall dá diagnostisering eller funktionskontroll ska utforas maste det utforas dä DOC-enheten overstiger en viss temperatur. For att erhalla denna temperatur anvands harvid ett forfarande som inbegriper bransledosering. DOC-enheten oxiderar harvid tillfOrt bransle och orsaker en temperaturhojning has avgaser som kan matas nedstroms namnda DOC-enhet, varvid diagnos av DOC-enheten kan utforas harvid. Av flera orsaker är det inte alltid onskvart att diagnostisera en DOC-enhet pa detta satt. Vidare är det inte ens alltid mojligt att kunna utfora en sadan diagnostisering. Performance control of the said DOC unit can today only be performed under certain specific conditions and operating condition of the vehicle. In most cases when diagnosis or function check is to be performed, it must be performed when the DOC unit exceeds a certain temperature. To obtain this temperature, a process involving industry dosing is used. The DOC unit thereby oxidizes the supplied fuel and causes a temperature rise to have exhaust gases which can be fed downstream of the said DOC unit, whereby a diagnosis of the DOC unit can be made therewith. For several reasons, it is not always difficult to diagnose a DOC device in this way. Furthermore, it is not even always possible to perform such a diagnosis.

US20120186226 beskriver en metod for att diagnostisera en DOC-enhet med hjalp av temperaturmatning pa en uppstromssida respektive en nedstromssida darav. 3 SAMMANFATTNING AV UPPFINNINGEN Det finns saledes ett behov av att pa ett tillforlitligt satt utfora prestandakontroll av en DOC-enhet has ett avgasreningssystem has ett avgasreningssystem has ett motorfordon. US20120186226 describes a method for diagnosing a DOC unit by means of temperature supply on an upstream side and a downstream side thereof, respectively. SUMMARY OF THE INVENTION Thus, there is a need to reliably perform a performance check of a DOC unit having an exhaust purification system having an exhaust purification system having a motor vehicle.

Det finns ett behov att pa ett effektivt, palitligt och anvandarvanligt satt bedOma en DOC-enhet has olika avgasreningssystem i prestandaavseende. There is a need to evaluate in a efficient, reliable and user-friendly way a DOC unit has different exhaust gas cleaning systems in terms of performance.

Ett syfte med foreliggande uppfinning är att tillhandahalla ett nytt och fordelaktigt forfarande for prestandakontroll av en DOC-enhet has ett avgasreningssystem. An object of the present invention is to provide a new and advantageous method for performance control of a DOC unit having an exhaust gas purification system.

Ett annat syfte med uppfinningen är att tillhandahalla ett nytt och fordelaktigt system for prestandakontroll av en DOC-enhet has ett avgasreningssystem och ett nytt och fordelaktigt datorprogram for att utfora en prestandakontroll av en DOC-enhet has ett avgasreningssystem. Another object of the invention is to provide a new and advantageous performance control system for a DOC unit having an exhaust gas purification system and a new and advantageous computer program for performing a performance control of a DOC unit having an exhaust purification system.

Ytterligare ett syfte med uppfinningen är att tillhandahalla ett alternativt forfarande for prestandakontroll av en DOC-enhet has ett avgasreningssystem, ett alternativt 2o system for prestandakontroll av en DOC-enhet has ett avgasreningssystem och ett alternativt datorprogram for att styra en prestandakontroll av en DOC-enhet has ett avgasreningssystem. A further object of the invention is to provide an alternative method for performance control of a DOC unit having an exhaust purification system, an alternative system for performance control of a DOC unit having an exhaust purification system and an alternative computer program for controlling a performance control of a DOC unit. has an exhaust gas purification system.

Ytterligare ett syfte med uppfinningen är att tillhandahalla ett forfarande vid ett avgasreningssystem, en anordning vid ett avgasreningssystem och ett datorprogram kir att astadkomma en tillfarlitlig prestandakontroll av en DOC-enhet has ett motorfordon. A further object of the invention is to provide a method of an exhaust gas purification system, an apparatus of an exhaust gas purification system and a computer program which are to provide a reliable performance control of a DOC unit having a motor vehicle.

Ytterligare ett syfte med uppfinningen är att tillhandahalla ett forfarande vid ett avgasreningssystem, ett system vid ett avgasreningssystem och ett datorprogram for att astadkomma en tillfOrlitlig prestandakontroll av en DOC-enhet has ett SCR-system, vilket SCR-system kan vara installerat has ett motorfordon. 4 Vissa av namnda syften uppnas med ett forfarande for prestandakontroll av en DOCenhet has ett avgasreningssystem enligt patentkrav 1. Andra syften uppnas med ett system for prestandakontroll av en DOC-enhet hos ett avgasreningssystem enligt patentkrav 8. Fordelaktiga utforingsformer anges i de beroende patentkraven. A further object of the invention is to provide a method of an exhaust purification system, a system of an exhaust purification system and a computer program for providing a reliable performance control of a DOC unit having an SCR system, which SCR system may be installed having a motor vehicle. Some of said objects are achieved with a performance control method of a DOC unit having an exhaust gas purification system according to claim 1. Other objects are achieved with a performance control system of a DOC unit of an exhaust gas purification system according to claim 8. Advantageous embodiments are stated in the dependent claims.

Enligt en aspekt av foreliggande uppfinning tillhandahalls ett forfarande for prestandakontroll av en DOC-enhet has ett avgasreningssystem innefattande en forsta NO,-sensor uppstroms namnda DOC-enhet och en SCR-katalysator nedstrOms namnda DOC-enhet. FOrfarandet innefattar stegen att: ia - i huvudsak tomma namnda SCR-katalysator pa reduktionsmedel; - faststalla en fOrsta NO2-halt has avgaserna pa basis av en faststalld NO,-halt uppstroms namnda DOC-enhet och en faststalld omvandlingsgrad rorande omvandling till NO2 has avgasreningssystemet uppstrOms namnda SCR-katalysator; - faststalla en andra NO2-halt has avgaserna pa basis av en medelst en korskanslig NH3-sensor faststalld NH3-halt och en korskanslighetsfunktion rorande NO2 for namnda NH3-sensor; och - bedoma prestanda has namnda DOC-enhet pa basis av namnda faststallda forsta NO2-halt och namnda faststallda andra NO2-halt. According to one aspect of the present invention, there is provided a method of performance monitoring of a DOC unit having an exhaust gas purification system comprising a first NO 2 sensor upstream of said DOC unit and an SCR catalyst downstream of said DOC unit. The process comprises the steps of: ia - substantially emptying said SCR catalyst on reducing agent; - determining a first NO2 content has the exhaust gases on the basis of a fixed NO, - content upstream of said DOC unit and a fixed conversion rate concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst; determining a second NO2 content has the exhaust gases on the basis of an NH3 content determined by means of a crossover NH3 sensor and a crossover function relating to NO2 for said NH3 sensor; and - assess the performance of said DOC unit on the basis of said determined first NO2 content and said determined second NO2 content.

Harvid astadkommes ett tillforlitligt forfarande for att bedoma prestanda has en DOC- enhet. Fordelaktigt behovs ingen temperaturhojning i avgassystemet astadkommas for att utfora namnda prestandakontroll, vilket ger ett branslesnalt forfarande enligt en aspekt av uppfinningen. This provides a reliable procedure for assessing the performance of a DOC unit. Advantageously, no temperature rise in the exhaust system is required to be performed to perform said performance control, which provides an industry-friendly method according to an aspect of the invention.

FOrfarandet kan innefatta steget att: - faststalla namnda omvandlingsgrad has avgasreningssystemet uppstrams namnda SCR-katalysator genom berakning inbegripande parametrarna avgastemperatur och avgasmassflode. Harvid tillhandahalles ett noggrant satt att berakna namnda forsta NO2-halt. The process may comprise the step of: - determining said degree of conversion has the exhaust gas purification system tightened said SCR catalyst by calculating including the exhaust gas temperature and exhaust mass flow parameters. In this case an accurate method is provided for calculating the first NO2 content.

FOrfarandet kan innefatta steget att: - faststalla namnda korskanslighetsfunktion rorande NO2 for namnda NH3-sensor baserat pa en aktuell driftpunktangivelse avseende en motor alstrande namnda avgaser och/eller avgassammansattning och/eller avgastemperatur. Harvid tillhandahalles ett noggrant satt att berakna namnda forsta NO2-halt. Namnda korskanslighetsfunktion anger ett matt pa korskansligheten for NO2 has namnda ammoniaksensor 278. The method may comprise the step of: - determining said cross-probability function concerning NO2 for said NH3 sensor based on a current operating point indication regarding an engine producing said exhaust gases and / or exhaust gas composition and / or exhaust gas temperature. In this case an accurate method is provided for calculating the first NO2 content. The cross-probability function indicates a measure of the cross-probability of NO2 having the said ammonia sensor 278.

Forfarandet kan innefatta steget att: - faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator uppnatts genom att mata namnda forsta NO,-halt uppstroms namnda DOC-enhet 10 och att mata en andra NOx-halt nedstroms namnda SCR-katalysator; och - taga i huvudsak overensstammande varden has de bada NO„-halterna som kriterium pa att avsedd tomning uppnatts. Harvid tillhandahalles ett tillforlitligt satt att faststalla att tomning skett. Vidare tillhandahalles ett tillforlitligt och anvandarvanligt forfarande for prestandakontroll av en DOC-enhet. The method may comprise the step of: - determining that the intended emptying of reducing agent of said SCR catalyst has been achieved by feeding said first NO 2 content upstream of said DOC unit 10 and feeding a second NOx content downstream of said SCR catalyst; and - take essentially the corresponding value, the two NO 'levels have as a criterion that the intended emptying has been achieved. In this case, a reliable method is provided to establish that emptying has taken place. Furthermore, a reliable and user-friendly procedure for performance monitoring of a DOC unit is provided.

Forfarandet kan innefatta stegen att: - faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator uppnatts genom att modellera/berakna namnda forsta NO,-halt uppstroms namnda DOC-enhet och att mata en andra NO,-halt nedstroms namnda SCR-katalysator; och - taga i huvudsak overensstammande varden has de bada NO„-halterna som kriterium pa att avsedd tomning uppnatts. The method may comprise the steps of: - determining that the intended emptying of reducing agent of said SCR catalyst has been achieved by modeling / calculating said first NO, content upstream of said DOC unit and feeding a second NO, content downstream of said SCR catalyst; and - take essentially the corresponding value, the two NO 'levels have as a criterion that the intended emptying has been achieved.

Harvid tillhandahalles ett tillforlitligt satt att faststalla att tomning skett. Vidare tillhandahalles ett tillforlitligt och anvandarvanligt forfarande for prestandakontroll av en DOC-enhet. In this case, a reliable method is provided to establish that emptying has taken place. Furthermore, a reliable and user-friendly procedure for performance monitoring of a DOC unit is provided.

FOrfarandet kan innefatta steget att: - becloma prestanda hos namnda DOC-enhet pa basis av namnda faststallda forsta NO2-halt och namnda faststallda andra NO2-halt, varvid en kvot mellan namnda forsta NO2-halt och namnda andra NO2-halt skall ligga utanfor ett forutbestamt intervall kir att indikera att bristande prestanda hos namnda DOC-enhet fOreligger. 6 Harvid tillhandahalles ett tillforlitligt och anvandarvanligt forfarande for prestandakontroll av en DOC-enhet. The method may comprise the step of: - determining the performance of said DOC unit on the basis of said determined first NO2 content and said determined second NO2 content, wherein a ratio between said first NO2 content and said second NO2 content shall be outside a predetermined interval kir to indicate that there is a lack of performance of the said DOC unit. 6 A reliable and user-friendly procedure for performance control of a DOC unit is provided.

Forfarandet kan innefatta steget att: - bedoma prestanda has namnda DOC-enhet pa basis av namnda faststallda forsta NO2-halt och namnda faststallda andra NO2-halt, varvid en absolut skillnad mellan namnda forsta NO2-halt och namnda andra NO2-halt overstigande ett forutbestamt troskelvarde indikerar bristande prestanda has namnda DOC-enhet. Harvid tillhandahalles ett tillforlitligt och anvandarvanligt forfarande for prestandakontroll av en DOC-enhet. The method may comprise the step of: - assessing the performance of said DOC unit on the basis of said determined first NO2 content and said determined second NO2 content, an absolute difference between said first NO2 content and said second NO2 content exceeding a predetermined threshold value indicates poor performance has said DOC unit. This provides a reliable and user-friendly procedure for performance monitoring of a DOC unit.

Enligt en aspekt av foreliggande uppfinning tillhandahalls ett system for prestandakontroll av en DOC-enhet has ett avgasreningssystem innefattande en forsta NO,-sensor anordnad uppstroms namnda DOC-enhet och en SCR-katalysator anordnad nedstroms namnda DOC-enhet. Systemet innefattar: - organ anpassade att i huvudsak tomma namnda SCR-katalysator pa reduktionsmedel; - organ anpassade att faststalla en forsta NO2-halt has avgaserna pa basis av en faststalld NO,-halt uppstroms namnda DOC-enhet och en faststalld omvandlingsgrad rorande omvandling till NO2 has avgasreningssystemet uppstroms namnda SCRkatalysator; - organ anpassade att faststalla en andra NO2-halt has avgaserna pa basis av en medelst en korskanslig NH3-sensor faststalld NH3-halt och en korskanslighetsfunktion rorande NO2 for namnda NH3-sensor; och - organ anpassade att bedama prestanda has namnda DOC-enhet pa basis av namnda faststallda forsta NO2-halt och namnda faststallda andra NO2-halt. According to one aspect of the present invention, there is provided a performance control system of a DOC unit having an exhaust gas purification system comprising a first NO 2 sensor arranged upstream of said DOC unit and an SCR catalyst arranged downstream of said DOC unit. The system comprises: - means adapted to substantially empty said SCR catalyst on reducing agents; means adapted to determine a first NO2 content has the exhaust gases on the basis of a fixed NO, content upstream of said DOC unit and a fixed conversion rate for conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst; means adapted to determine a second NO2 content have the exhaust gases on the basis of a NH3 content determined by means of a crossover NH3 sensor and a crossover function touching NO2 for said NH3 sensor; and - means adapted to assess the performance of said DOC unit on the basis of said determined first NO2 content and said determined second NO2 content.

Systemet kan innefatta: - organ anpassade att faststalla namnda omvandlingsgrad has avgasreningssystemet uppstroms namnda SCR-katalysator genom berakning inbegripande parametrarna avgastemperatur och avgasmassflade. The system may comprise: - means adapted to determine said degree of conversion having the exhaust gas purification system upstream of said SCR catalyst by calculation including the parameters exhaust temperature and exhaust mass.

Systemet kan innefatta: 7 - organ anpassade att faststalla namnda korskanslighetsfunktion rorande NO2 for namnda NH3-sensor baserat pa en aktuell driftpunktangivelse avseende en motor alstrande namnda avgaser och/eller avgassammansattning och/eller avgastemperatur. The system may comprise: 7 means adapted to determine said cross-probability function concerning NO2 for said NH3 sensor based on a current operating point indication regarding an engine producing said exhaust gases and / or exhaust gas composition and / or exhaust gas temperature.

Systemet kan innefatta: - organ anpassade att faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator uppnatts genom att mata namnda forsta NOx-halt uppstroms namnda DOC-enhet och att mata en andra NOx-halt nedstroms namnda SCRkatalysator; och - organ anpassade att taga i huvudsak overensstammande varden hos de bada NORhalterna som kriterium pa att avsedd tomning uppnatts. The system may comprise: - means adapted to determine that the intended emptying of reducing agent of said SCR catalyst has been achieved by feeding said first NOx content upstream of said DOC unit and feeding a second NOx content downstream of said SCR catalyst; and - bodies adapted to take the substantially consistent value of the two NOR contents as a criterion that the intended emptying has been achieved.

Systemet kan innefatta: - organ anpassade att faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator uppnatts genom att modellera/berakna namnda forsta NOx-halt uppstroms namnda DOC-enhet; - organ anpassade att mata en andra NOx-halt nedstrams namnda SCR-katalysator; och - organ anpassade att taga i huvudsak Overensstammande varden hos de bada NORhalterna som kriterium pa att avsedd tomning uppnatts. The system may comprise: - means adapted to determine that the intended emptying of reducing agent of said SCR catalyst has been achieved by modeling / calculating said first NOx content upstream of said DOC unit; means adapted to feed a second NOx content downstream of said SCR catalyst; and - bodies adapted to take essentially the corresponding value of the two NOR contents as a criterion for the intended emptying having been achieved.

Systemet kan innefatta: - organ anpassade att bedoma prestanda hos namnda DOC-enhet pa basis av namnda faststallda forsta NO2-halt och namnda faststallda andra NO2-halt, varvid en kvot mellan namnda forsta NO2-halt och namnda andra NO2-halt skall ligga utanfor ett forutbestamt intervall for att indikera att bristande prestanda hos namnda DOC- enhet foreligger. The system may comprise: - means adapted to assess the performance of said DOC unit on the basis of said determined first NO2 content and said determined second NO2 content, a ratio between said first NO2 content and said second NO2 content being outside a predetermined interval to indicate that there is a lack of performance in the said DOC unit.

Systemet kan innefatta: 8 - organ anpassade att bedoma prestanda hos namnda DOC-enhet pa basis av namnda faststallda forsta NO2-halt och namnda faststallda andra NO2-halt, varvid en absolut skillnad mellan namnda forsta NO2-halt och namnda andra NO2-halt overstigande ett forutbestamt troskelvarde indikerar bristande prestanda hos namnda DOC-enhet. The system may comprise: 8 - means adapted to assess the performance of said DOC unit on the basis of said determined first NO2 content and said determined second NO2 content, an absolute difference between said first NO2 content and said second NO2 content exceeding a predetermined threshold value indicates poor performance of said DOC unit.

Enligt en aspekt av foreliggande uppfinning tillhandahalls ett motorfordon innefattande ett system for prestandakontroll av en DOC-enhet hos ett avgasreningssystem enligt nagot av kraven 8-14. According to one aspect of the present invention, there is provided a motor vehicle comprising a performance control system of a DOC unit of an exhaust gas purification system according to any of claims 8-14.

Namnda motorfordon kan vara nagot av en lastbil, buss eller personbil. Said motor vehicle can be anything from a truck, bus or car.

Enligt en aspekt av fOreliggande uppfinning tillhandahalls datorprogram vid ett avgasreningssystem, dar namnda datorprogram innefattar programkod for att orsaka en elektronisk styrenhet eller en dator ansluten till den elektroniska styrenheten att utfora stegen enligt nagot av patentkraven 1-7. According to one aspect of the present invention, computer programs are provided in an exhaust gas purification system, said computer program comprising program code for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps according to any of claims 1-7.

Enligt en aspekt av fOreliggande uppfinning tillhandahalls datorprogram vid ett avgasreningssystem, dar namnda datorprogram innefattar programkod for att orsaka en elektronisk styrenhet eller en dator ansluten till den elektroniska styrenheten att utfora stegen enligt nagot av patentkraven 1-7, nar namnda programkod kors hos namnda styrenhet eller namnda dator. According to one aspect of the present invention, computer programs are provided in an exhaust gas purification system, said computer program comprising program code for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps of any of claims 1-7, when said program code intersects with said control unit or named computer.

Enligt en aspekt av fOreliggande uppfinning tillhandahalls datorprogram vid ett avgasreningssystem, dar namnda datorprogram innefattar programkod lagrad pa ett, av en dator lasbart, medium for att orsaka en elektronisk styrenhet eller en dator ansluten till den elektroniska styrenheten att utfora stegen enligt nagot av patentkraven 1-7. According to one aspect of the present invention, computer programs are provided in an exhaust gas purification system, said computer program comprising program code stored on a computer readable medium for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps of any of claims 1- 7.

Enligt en aspekt av fOreliggande uppfinning tillhandahalls datorprogram vid ett avgasreningssystem, dar namnda datorprogram innefattar programkod lagrad pa ett, av en dator lasbart, medium for att orsaka en elektronisk styrenhet eller en dator ansluten till den elektroniska styrenheten att utfora stegen enligt nagot av 9 patentkraven 1-7, nar namnda programkod kors hos namnda styrenhet eller namnda dator. According to one aspect of the present invention, computer programs are provided in an exhaust gas purification system, said computer program comprising program code stored on a computer readable medium for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps of any of the claims 1. -7, when said program code is crossed at said control unit or said computer.

Enligt en aspekt av foreliggande uppfinning tillhandahalls en datorprogramprodukt innefattande en programkod lagrad pa ett, av en dator lasbart, medium fOr att utfOra forfarandestegen enligt nagot av patentkraven 1-7, nar namnda datorprogram kors pa en elektronisk styrenhet eller en dator ansluten till den elektroniska styrenheten. According to one aspect of the present invention, there is provided a computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-7, when said computer program is crossed on an electronic control unit or a computer connected to the electronic control unit. .

Enligt en aspekt av fOreliggande uppfinning tillhandahalls en datorprogramprodukt innefattande en programkod icke-flyktigt lagrad pa ett, av en dator lasbart, medium for att utfora forfarandestegen enligt nagot av patentkraven 1-7, nar namnda programkod kors pa en elektronisk styrenhet eller en dator ansluten till den elektroniska styrenheten. According to one aspect of the present invention, there is provided a computer program product comprising a program code non-volatile stored on a computer readable medium for performing the method steps of any of claims 1-7, when said program code is crossed on an electronic controller or computer connected to the electronic control unit.

Ytterligare syften, fordelar och nya sardrag hos den foreliggande uppfinningen kommer att framga for fackmannen av foljande detaljer, liksom via utovning av uppfinningen. Medan uppfinningen är beskriven nedan, bor det framga att uppfinningen inte är begransad till de specifika beskrivna detaljerna. Fackman som har tillgang till laroma hari kommer att kanna igen ytterligare applikationer, modifieringar och inforlivanden inom andra omraden, vilka är inom omfanget for uppfinningen. oVERSIKTLIG BESKRIVNING AV RITNINGARNA For en mer komplett forstaelse av foreliggande uppfinning och ytterligare syften och fOrdelar darav, gOrs nu hanvisning till faljande detaljerade beskrivning som ska lasas tillsammans med de atfoljande ritningarna dar lika hanvisningsbeteckningar avser lika delar i de olika figurerna, och i vilka: Figur 1 schematiskt illustrerar ett fordon, enligt en utforingsform av uppfinningen; Figur 2 schematiskt illustrerar ett delsystem has fordonet visat i Figur 1, enligt en utforingsform av uppfinningen; Figur 3 schematiskt illustrerar ett delsystem has fordonet visat i Figur 1, enligt en utforingsform av uppfinningen; Figur 4a schematiskt illustrerar ett flodesschema over ett forfarande, enligt en utforingsform av uppfinningen; Figur 4b i ytterligare detalj schematiskt illustrerar ett flodesschema over ett forfarande, enligt en utforingsform av uppfinningen; och Figur 5 schematiskt illustrerar en dator, enligt en utfOringsform av uppfinningen. Additional objects, advantages, and novel features of the present invention will become apparent to those skilled in the art from the following details, as well as through the practice of the invention. While the invention is described below, it should be understood that the invention is not limited to the specific details described. Those skilled in the art having access to laroma hari will recognize further applications, modifications, and incorporations within other fields which are within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding of the present invention and further objects and advantages thereof, reference is now made to the following detailed description which is to be read in conjunction with the accompanying drawings in which like reference numerals refer to like parts in the various figures, and in which: 1 schematically illustrates a vehicle, according to an embodiment of the invention; Figure 2 schematically illustrates a subsystem of the vehicle shown in Figure 1, according to an embodiment of the invention; Figure 3 schematically illustrates a subsystem of the vehicle shown in Figure 1, according to an embodiment of the invention; Figure 4a schematically illustrates a flow chart of a process, according to an embodiment of the invention; Figure 4b schematically illustrates in further detail a flow chart of a method, according to an embodiment of the invention; and Figure 5 schematically illustrates a computer, according to an embodiment of the invention.

DETALJERAD BESKRIVNING AV FIGURERNA Med hanvisning till Figur 1 visas en sidovy av ett fordon 100. Det exemplifierade fordonet 100 bestar av en dragbil 110 och en slapvagn 112. Fordonet kan vara ett tungt fordon, sasom en lastbil eller en buss. Fordonet kan alternativt vara en personbil eller en bandvagn. DETAILED DESCRIPTION OF THE FIGURES Referring to Figure 1, a side view of a vehicle 100 is shown. The exemplary vehicle 100 consists of a tractor 110 and a trailer 112. The vehicle may be a heavy vehicle, such as a truck or a bus. The vehicle can alternatively be a car or a tracked vehicle.

Hari hanfor sig termen "lank" till en kommunikationslank som kan vara en fysisk ledning, sasom en opto-elektronisk kommunikationsledning, eller en icke-fysisk ledning, sasom en tradlos anslutning, till exempel en radio- eller mikrovagslank. The term "lank" refers to a communication link which may be a physical line, such as an optoelectronic communication line, or a non-physical line, such as a wireless connection, for example a radio or microwave line.

Hari hanfor sig termen "reduktant" till ett medel som anvands for att reagera med vissa emissioner i ett SCR-system. Dessa emissioner kan t.ex. vara NOR-gas. Hari refers to the term "reductant" as a means used to react with certain emissions in an SCR system. These emissions can e.g. be NOR gas.

Namnda reduktant är enligt ett utforande s.k. AdBlue. Naturligtvis kan andra slag av reduktanter anvandas. Han anges AdBlue som ett exempel pa en reduktant men en fackman inser att det uppfinningsmassiga forfarandet och det uppfinningsmassiga SCR-systemet kan realiseras for andra typer av reduktanter. Said reductant is according to an embodiment so-called AdBlue. Of course, other types of reductants can be used. He cites AdBlue as an example of a reductant, but one skilled in the art will recognize that the inventive process and inventive SCR system can be realized for other types of reductants.

Det bor papekas att uppfinningen lampar sig for tillampning has ett lampligt avgasreningssystem innefattande en DOC-enhet, och an saldes inte begransat till ett avgasreningssystem innefattande en DOC-enhet has motorfordon. Det uppfinningsmassiga forfarandet och det uppfinningsmassiga systemet lampar sig val for andra plattformar som inbegriper ett avgasreningssystem an motorfordon, sasom t.ex. vattenfarkoster. Vattenfarkosterna kan vara av godtyckligt slag, sasom t.ex. motorbatar, fartyg, farjor eller skepp. It should be noted that the invention is suitable for application having a suitable exhaust gas purification system comprising a DOC unit, and is not limited to an exhaust purification system comprising a DOC unit having a motor vehicle. The inventive method and the inventive system make choices for other platforms which include an exhaust gas purification system of motor vehicles, such as e.g. watercraft. The watercraft can be of any kind, such as e.g. motor boats, ships, ferries or ships.

Det uppfinningsmassiga forfarandet och det uppfinningsmassiga systemet vid ett avgasreningssystem enligt en aspekt av uppfinningen lampar sig aven val for t.ex. 11 system inbegripande traktorer, dumprar, motorredskap, industrimotorer och/eller motordrivna industrirobotar. The inventive method and the inventive system in an exhaust gas purification system according to an aspect of the invention also lend themselves to choices for e.g. 11 systems including tractors, dumpers, power tools, industrial engines and / or powered industrial robots.

Det uppfinningsmassiga forfarandet och det uppfinningsmassiga systemet vid ett avgasreningssystem enligt en aspekt av uppfinningen lampar sig aven val for olika slag av kraftverk, sasom t.ex. ett elkraftverk innefattande en dieselgenerator. The inventive method and the inventive system in an exhaust gas purification system according to an aspect of the invention also illuminate choices for different types of power plants, such as e.g. an electric power plant comprising a diesel generator.

Det uppfinningsmassiga forfarandet och det uppfinningsmassiga systemet vid ett avgasreningssystem lampar sig val fOr ett godtyckligt motorsystem som inbegriper en motor, DOC enhet och ett SCR-system, sasom t.ex. hos ett lok eller annan plattform. The inventive process and the inventive system of an exhaust gas purification system make choices for an arbitrary engine system that includes an engine, DOC unit and an SCR system, such as e.g. at a locomotive or other platform.

Det uppfinningsmassiga forfarandet och det uppfinningsmassiga systemet vid ett avgasreningssystem lampar sig val for ett system som inbegriper en NOx-generator, exempelvis en dieselmotor, vars avgaser skall renas. The inventive process and the inventive system of an exhaust gas purification system make choices for a system which includes a NOx generator, for example a diesel engine, the exhaust gases of which are to be purified.

Det uppfinningsmassiga forfarandet och det uppfinningsmassiga systemet vid ett avgasreningssystem lampar sig val for ett system som inbegriper en NOx-generator, exempelvis en dieselmotor, och en DOC-enhet. The inventive process and the inventive system of an exhaust gas purification system make choices for a system that includes a NOx generator, such as a diesel engine, and a DOC unit.

Hari hanfor sig termen "ledning" till en passage for att halla och transportera en fluid, sasom t.ex. en reduktant i vatskeform. Ledningen kan vara ett ror av godtycklig dimension. Ledningen kan besta av ett godtyckligt, lampligt material, sasom t.ex. plast, gummi eller metall. In this he refers to the term "line" to a passage for holding and transporting a fluid, such as e.g. a reductant in liquid form. The pipe can be a rudder of any dimension. The cable can consist of an arbitrary, suitable material, such as e.g. plastic, rubber or metal.

Med hanvisning till Figur 2 visas ett delsystem 299 has fordonet 100. Delsystemet 299 kan vara anordnat i dragbilen 110. Delsystemet 299 kan utgOra en del av ett SCR-system som ingar i avgasreningssystemet enligt en aspekt av foreliggande uppfinning, vilket avgasreningssystem beskrivs i ytterligare detalj med hanvisning till Figur 3. Referring to Figure 2, a subsystem 299 is shown having the vehicle 100. The subsystem 299 may be located in the tractor 110. The subsystem 299 may form part of an SCR system incorporating the exhaust gas purification system according to an aspect of the present invention, the exhaust gas purification system being described in further detail. with male reference to Figure 3.

Delsystemet 299 bestar enligt detta exempel av en behallare 205 som är anordnad att halla en reduktant. En forsta ledning 271 är anordnad att leda reduktanten till en pump 230 Iran behallaren 205. Namnda pump är 230 anordnad att pumpa upp reduktanten fran behallaren 205 via den forsta ledningen 271 och via en andra 12 ledning 272 tillfora namnda reduktant till en doseringsenhet 250. Pumpen 230 är anordnad att trycksatta reduktanten i den andra ledningen 272. The subsystem 299 according to this example consists of a container 205 which is arranged to hold a reductant. A first line 271 is arranged to lead the reductant to a pump 230 Iran the container 205. The said pump is 230 arranged to pump the reductant from the container 205 via the first line 271 and via a second line 272 supply said reductant to a dosing unit 250. The pump 230 is arranged to pressurize the reductant in the second line 272.

Doseringsenheten 250 är anordnad att tillfora namnda reduktant till ett 5 avgasreningssystem (se Fig. 3) has fordonet 100. Narmare bestamt är doseringsenheten 250 anordnad att pa ett styrt satt tillfora en lamplig mangd reduktant till ett avgasreningssystem has fordonet 100. Enligt detta utfOrande är en SCR-katalysator (se Fig. 3) anordnad nedstroms ett lage dar tillforsel av reduktanten astadkommes. Den mangd reduktant som tillfOrs i avgassystemet är avsedd att 10 anvandas i SCR-katalysatorn for att reducera mangden oonskade emissioner. The dosing unit 250 is arranged to supply said reductant to an exhaust gas purification system (see Fig. 3) has the vehicle 100. More specifically, the dosing unit 250 is arranged to supply in a controlled manner a suitable amount of reductant to an exhaust purification system has the vehicle 100. According to this embodiment, a SCR catalyst (see Fig. 3) arranged downstream of a low supply of the reductant is provided. The amount of reductant supplied to the exhaust system is intended to be used in the SCR catalyst to reduce the amount of unwanted emissions.

En tredje ledning 273 är forefintligt anordnad mellan doseringsanordningen 250 och behallaren 205. Den tredje ledningen 273 är anordnad att leda tillbaka en viss mangd av reduktanten som matats till doseringsenheten 250 till behallaren 205. A third conduit 273 is presently disposed between the metering device 250 and the container 205. The third conduit 273 is arranged to return a certain amount of the reductant fed to the metering unit 250 to the container 205.

Den forsta styrenheten 200 är anordnad for kommunikation med pumpen 230 via en lank 292. Den forsta styrenheten 200 är anordnad att styra drift av pumpen 230 for att t.ex. reglera floden av reduktanten inom delsystemet 299. The first control unit 200 is arranged for communication with the pump 230 via a line 292. The first control unit 200 is arranged to control operation of the pump 230 in order to e.g. regulate the flow of the reductant within the subsystem 299.

Den forsta styrenheten 200 är anordnad for kommunikation med doseringsenheten 250 via en lank L250. Den forsta styrenheten 200 är anordnad att styra drift av doseringsenheten 250 for att t.ex. reglera tillforsel av reduktanten till avgasreningssystemet has fordonet 100. Den forsta styrenheten 200 är anordnad att aktivera cirkulering av namnda reduktionsmedel medelst namnda pump 230 dä det bedoms vara lampligt. Den forsta styrenheten 200 är anordnad att aktivera dosering av namnda reduktionsmedel dá det bedOms vara lampligt. Den farsta styrenheten 200 är enligt en aspekt av foreliggande uppfinning anordnad att stanga av tillforsel av reduktionsmedel till SCR-katalysatorn for att vasentligen tomma namnda SCRkatalysator pa inlagrat/tillfort reduktionsmedel. Den forsta styrenheten 200 är enligt en aspekt av foreliggande uppfinning anordnad att stanga av tillforsel av reduktionsmedel till SCR-katalysatorn for att vasentligen fullstandigt tomma namnda SCR-katalysator pa inlagrat/tillfort reduktionsmedel. 13 Enligt en aspekt av foreliggande uppfinning är namnda forsta styrenhet 200 anordnad att styra namnda doseringsenhet 250 pa ett sadant satt att reduktionsmedelstillforsel till namnda avgaser temporart upphor. Vid prestandakontroll av namnda DOC-enhet hos avgasreningssystemet tillfors saledes enligt en aspekt av fOreliggande uppfinning inget eller vasentligen inget reduktionsmedel till namnda SCR-katalysator hos avgasreningssystemet. Harvid mOjliggOrs en effektiv och noggrann prestandakontroll av en DOC-enhet has namnda avgasreningssystem. The first control unit 200 is arranged for communication with the dosing unit 250 via a long L250. The first control unit 200 is arranged to control the operation of the dosing unit 250 in order to e.g. regulating the supply of the reductant to the exhaust gas purification system has the vehicle 100. The first control unit 200 is arranged to activate circulation of said reducing agent by means of said pump 230 when it is judged to be suitable. The first control unit 200 is arranged to activate dosing of said reducing agent when it is judged to be appropriate. According to one aspect of the present invention, the first control unit 200 is arranged to shut off the supply of reducing agent to the SCR catalyst in order to substantially empty said SCR catalyst on stored / supplied reducing agent. According to one aspect of the present invention, the first control unit 200 is arranged to shut off the supply of reducing agent to the SCR catalyst in order to substantially completely empty said SCR catalyst of stored / supplied reducing agent. According to one aspect of the present invention, said first control unit 200 is arranged to control said dosing unit 250 in such a manner that the supply of reducing agent to said exhaust gases temporarily ceases. Thus, in a performance check of said DOC unit of the exhaust gas purification system, according to one aspect of the present invention, no or substantially no reducing agent is supplied to said SCR catalyst of the exhaust gas purification system. This enables efficient and accurate performance control of a DOC unit's named exhaust gas purification system.

En andra styrenhet 210 är anordnad for kommunikation med den forsta styrenheten 200 via en lank L210. Den andra styrenheten 210 kan vara lostagbart ansluten till den forsta styrenheten 200. Den andra styrenheten 210 kan vara en till fordonet 100 extern styrenhet. Den andra styrenheten 210 kan vara anordnad att utfora de uppfinningsmassiga forfarandestegen. Den andra styrenheten 210 kan anvandas for att ladda Over programkod till den forsta styrenheten 200, i synnerhet programkod for att utfora det uppfinningsmassiga forfarandet. Den andra styrenheten 210 kan alternativt vara anordnad for kommunikation med den forsta styrenheten 200 via ett internt natverk i fordonet. Den andra styrenheten 210 kan vara anordnad att utfora vasentligen likadana funktioner som den forsta styrenheten 200. A second control unit 210 is arranged for communication with the first control unit 200 via a long L210. The second control unit 210 may be releasably connected to the first control unit 200. The second control unit 210 may be a control unit external to the vehicle 100. The second control unit 210 may be arranged to perform the inventive process steps. The second control unit 210 can be used to load Over program code to the first control unit 200, in particular program code to perform the inventive method. The second control unit 210 may alternatively be arranged for communication with the first control unit 200 via an internal network in the vehicle. The second control unit 210 may be arranged to perform substantially similar functions to the first control unit 200.

Figur 3 illustrerar schematiskt ett delsystem 289 has fordonet 100 som visas i Figur 1, enligt en utfOringsform av uppfinningen. Namnda delsystem 289 utgor en del av ett avgasreningssystem has fordonet 100. Namnda delsystem 299 som beskrivs med hanvisning till Figur 2 kan ocksa utgora en del av namnda avgasreningssystem. Figure 3 schematically illustrates a subsystem 289 of the vehicle 100 shown in Figure 1, according to an embodiment of the invention. Said subsystem 289 forms part of an exhaust gas purification system having the vehicle 100. Said subsystem 299 described with reference to Figure 2 may also form part of said exhaust gas purification system.

Harvid tillhandahalles en motor 231, vilken vid drift orsakar ett avgasflade som leds via en forsta passage 235 till en DOC-enhet 260. En andra passage 245 är anordnad att leda avgaser fran namnda DOC-enhet 260 till en DPF-enhet 265. Namnda DPFenhet 265 inbegriper ett dieselpartikelfilter (Diesel Particulate Filter). En tredje passage 255 är anordnad att leda avgaser fran namnda DPF-enhet 265 till ett SCRkatalysatorarrangemang 270. Namnda SCR-katalysatorarrangemang 270 kan alternativt benamnas SCR-katalysator. En fjarde passage 256 ar anordnad att leda avgaser Iran namnda SCR-katalysatorarrangemang 270 till en omgivning has fordonet 100. 14 Namnda doseringsenhet 250 som beskrivs med hanvisning till Figur 2 är anordnad att dosera reduktionsmedel in i namnda tredje passage 255. An engine 231 is provided, which in operation causes an exhaust surface which is led via a first passage 235 to a DOC unit 260. A second passage 245 is arranged to direct exhaust gases from said DOC unit 260 to a DPF unit 265. Said DPF unit 265 includes a Diesel Particulate Filter. A third passage 255 is arranged to direct exhaust gases from said DPF unit 265 to an SCR catalyst arrangement 270. Said SCR catalyst arrangement 270 may alternatively be termed SCR catalyst. A fourth passage 256 is arranged to direct exhaust gas Iran said SCR catalyst arrangement 270 to an environment having the vehicle 100. The said dosing unit 250 described with reference to Figure 2 is arranged to dose reducing agent into said third passage 255.

Det bOr papekas att namnda avgasreningssystem inte nadvandigtvis behover innefatta namnda DPF-enhet 265. It should be noted that said exhaust gas purification system does not necessarily need to include said DPF unit 265.

Den forsta styrenheten 200 är anordnad for kommunikation med motorn 231 via en lank L231. Den fOrsta styrenheten 200 är anordnad att styra drift hos namnda motor 231. Den forsta styrenheten 200 är exempelvis anordnad att styra bransledosering till forbranningskammare hos namnda motor 231. The first control unit 200 is arranged for communication with the motor 231 via a long L231. The first control unit 200 is arranged to control operation of said engine 231. The first control unit 200 is arranged, for example, to control industry metering to the combustion chamber of said engine 231.

Bransledoseringsorgan (ej visade) kan vara anordnade uppstroms namnda DOCenhet 260 och nedstroms namnda motor 231. Den fOrsta styrenheten 200 är anordnad for kommunikation med namnda bransledoseringsorgan via en darfor avsedd lank (ej visad). Den fOrsta styrenheten 200 är anordnad att styra dosering av bransle, exempelvis diesel, in i namnda forsta passage 235 medelst namnda bransledoseringsorgan for att astadkomma en sá kallad aktiv regenerering av namnda DPF-enhet 265. Enligt en aspekt av foreliggande uppfinning behovs inte aktiv regenerering utforas enligt det uppfinningsmassiga forfarandet, vilket astadkommer ett relativt billigt forfarande for prestandakontroll av namnda DOCenhet 260. Fuel metering means (not shown) may be arranged upstream of said DOC unit 260 and downstream of said motor 231. The first control unit 200 is arranged for communication with said industrial metering means via a dedicated link (not shown). The first control unit 200 is arranged to control dosing of fuel, for example diesel, into said first passage 235 by means of said industry dosing means to effect a so-called active regeneration of said DPF unit 265. According to an aspect of the present invention no active regeneration is required according to the inventive method, which provides a relatively inexpensive method for performance control of said DOC unit 260.

En forsta NOR-sensor 237 är anordnad uppstroms namnda DOC-enhet 260 vid namnda fOrsta passage 235. Namnda fOrsta NOR-sensor 237 är anordnad for kommunikation med den fOrsta styrenheten 200 via en lank L237. Namnda fOrsta NOR-sensor 237 är anordnad att fortlopande faststalla en radande NOR-halt NOR1 i den fOrsta passagen 235. Namnda fOrsta NOR-sensor 237 är anordnad att fortlopande skicka signaler S237 innefattande information om en radande NOR-halt NOR1 i namnda fOrsta passage 235 till den fOrsta styrenheten 200 via lanken L237. A first NOR sensor 237 is arranged upstream of said DOC unit 260 at said first passage 235. Said first NOR sensor 237 is arranged for communication with the first control unit 200 via a long L237. Said first NOR sensor 237 is arranged to continuously determine a radiating NOR content NOR1 in the first passage 235. Said first NOR sensor 237 is arranged to continuously send signals S237 including information about a radiating NOR content NOR1 in said first passage 235. to the first control unit 200 via the line L237.

En andra NOR-sensor 277 är anordnad nedstroms namnda SCR-katalysator 270 vid namnda fjarde passage 256. Namnda andra NOR-sensor 277 är anordnad for kommunikation med den fOrsta styrenheten 200 via en lank L277. Namnda andra NOR-sensor 277 är anordnad att fortlopande faststalla en radande NOR-halt NO2 i den fjarde passagen 256. Namnda andra NOR-sensor 277 är anordnad att fortlopande skicka signaler S277 innefattande information om en radande NOR-halt NO2 i namnda fjarde passage 256 till den forsta styrenheten 200 via lanken L277. A second NOR sensor 277 is arranged downstream of said SCR catalyst 270 at said fourth passage 256. Said second NOR sensor 277 is arranged for communication with the first control unit 200 via a long L277. Said second NOR sensor 277 is arranged to continuously determine a radiating NOR content NO2 in the fourth passage 256. Said second NOR sensor 277 is arranged to continuously send signals S277 including information about a radiating NOR content NO2 in said fourth passage 256 to the first control unit 200 via the link L277.

Namnda forsta NOR-sensor 237 och namnda andra NOR-sensor 277 kan anvandas kir att tillhandahalla uppgift am radande NOR-halt i den farsta passagen 235 respektive den fjarde passagen 277. Harvid kan den forsta styrenheten 200 vara anordnad att faststalla att avsedd tOmning av reduktionsmedel has namnda SCR- katalysator 270 uppnatts genom att mata namnda forsta NOR-halt NOR1 uppstroms namnda DOC-enhet 260 och att mata namnda andra NOR-halt NO2 nedstroms namnda SCR-katalysator 270, och taga i huvudsak Overensstammande varden has de bada NOR-halterna som kriterium pa att avsedd tomning uppnatts. Said first NOR sensor 237 and said second NOR sensor 277 can be used to provide information on the current NOR content in the first passage 235 and the fourth passage 277, respectively. In this case, the first control unit 200 can be arranged to determine that intended emptying of reducing agent has said SCR catalyst 270 been obtained by feeding said first NOR content NOR1 upstream of said DOC unit 260 and feeding said second NOR content NO2 downstream of said SCR catalyst 270, and taking substantially the corresponding value has the two NOR contents as a criterion that the intended emptying has been achieved.

Enligt ett utforingsexempel är namnda forsta NOR-sensor 237 anordnad i den forsta passagen 235, uppstroms namnda DOC-enhet 260 och nedstroms namnda motor 231 for att fortlopande mata/detektera/faststalla en forsta NOR-halt NOR1 has avgaserna dar och namnda andra NOR-sensor 277 är anordnad nedstroms namnda SCR-katalysator 270 for att fortlopande mata/detektera/faststalla en andra NOR-halt NO2 has avgaserna fran motorn 231. According to an embodiment, said first NOR sensor 237 is arranged in the first passage 235, upstream of said DOC unit 260 and downstream of said motor 231 to continuously feed / detect / determine a first NOR content NOR1 has the exhaust gases there and said second NOR sensor 277 is arranged downstream of said SCR catalyst 270 to continuously feed / detect / determine a second NOR content NO2 having the exhaust gases from the engine 231.

En temperatursensor 233 är anordnad uppstroms namnda DOC-enhet 260 vid namnda forsta passage 235. Namnda temperatursensor 233 är anordnad for kommunikation med den forsta styrenheten 200 via en lank L233. Namnda temperatursensor 233 är anordnad att fortlopande mata/detektera/faststalla en radande ternperatur T1meas has avgaserna i den forsta passagen 235. Namnda temperatursensor 233 är anordnad att fortlopande skicka signaler S233 innefattande information am en radande ternperatur T1meas has avgaserna i namnda fOrsta passage 235 till den forsta styrenheten 200 via lanken L233. A temperature sensor 233 is arranged upstream of said DOC unit 260 at said first passage 235. Said temperature sensor 233 is arranged for communication with the first control unit 200 via a line L233. Said temperature sensor 233 is arranged to continuously feed / detect / determine a radiating temperature T1meas has the exhaust gases in the first passage 235. Said temperature sensor 233 is arranged to continuously send signals S233 including information am a radiating temperature T1meas has the exhaust gases in the first pass first control unit 200 via line L233.

Enligt ett utforande är den forsta styrenheten 200 anordnad att medelst en dari inlagrad berakningsmodell faststalla en radande temperatur T1cal has avgaserna i den forsta passagen 235. Sagda radande temperatur T1cal has avgaserna i den 16 forsta passagen 235 kan faststallas pa basis av t.ex. ett faststallt avgasmassflode och ett matt pa till motorn 230 doserad mangd bransle. Harvid kan saledes namnda radande temperatur Tlcal beraknas/modelleras/uppskattas pa lampligt satt medelst namnda forsta styrenhet 200. Enligt en aspekt av foreliggande uppfinning kan atminstone flagon av namnda temperaturer T-I meas och Tical anvandas for att exempelvis modellerera en omvandlingsgrad X och korskanslighetsfunktion F. According to one embodiment, the first control unit 200 is arranged to determine by means of a storage model stored therein a radiating temperature T1cal has the exhaust gases in the first passage 235. Said radiating temperature T1cal has the exhaust gases in the first 16 passage 235 can be determined on the basis of e.g. a fixed exhaust mass flow and a matte on to the engine 230 dosed amount of fuel. Thus, said radiating temperature Tlcal can be calculated / modeled / estimated appropriately by means of said first control unit 200. According to one aspect of the present invention, at least flakes of said temperatures T-I meas and Tical can be used to model, for example, a conversion degree X and cross-probability function F.

En sensor (ej visad) for att mata ett radande avgasmassflode MF kan vara forefintligt anordnad i den fOrsta passagen 235. Namnda avgasmassfladessensor är anordnad att fortlopande faststalla ett radande avgasmassflode MF i den fOrsta passagen 2 och skicka signaler inbegripande uppgift darom till den fOrsta styrenheten 200 via en darfor avsedd lank (ej visad). A sensor (not shown) for feeding a radiating exhaust mass flow MF may be provided in the first passage 235. The said exhaust mass surface sensor is arranged to continuously determine a radiating exhaust mass flow MF in the first passage 2 and send signals including the control including information. via a dedicated link (not shown).

Enligt ett utforande är den fOrsta styrenheten 200 anordnad att medelst en dari inlagrad berakningsmodell faststalla ett radande avgasmassflode MF i den forsta passagen 235. Sagda ett radande avgasmassflode MF i den fOrsta passagen 235 kan faststallas pa basis av t.ex. ett faststallt drifttillstand hos motorn 231. According to one embodiment, the first control unit 200 is arranged to determine by means of a calculation model stored therein a radiating exhaust mass flow MF in the first passage 235. Said radiating exhaust mass flow MF in the first passage 235 can be determined on the basis of e.g. a determined operating state of the motor 231.

Den fOrsta styrenheten 200 är enligt ett utforande anordnad att faststalla en forsta 20 NON-halt NON1 hos avgaser uppstroms namnda DOC-enhet 260. Den forsta styrenheten 200 är enligt ett utforande anordnad att faststalla en andra NOR-halt hos avgaser nedstroms namnda SCR-katalysator 270. The first control unit 200 is according to one embodiment arranged to determine a first NON content NON1 of exhaust gases upstream of said DOC unit 260. The first control unit 200 is according to one embodiment arranged to determine a second NOR content of exhaust gases downstream of said SCR catalyst. 270.

Enligt ett utforande är den fOrsta styrenheten 200 anordnad att berakna/modellera/uppskatta namnda fOrsta NON-halt NON1 med en dari inlagrad modell. According to one embodiment, the first control unit 200 is arranged to calculate / model / estimate said first NON content NON1 with a model stored therein.

En ammoniaksensor 278 anordnad hos namnda SCR-katalysator 270. Enligt ett alternativt utforande an namnda ammoniaksensor 278 anordnad nedstroms namnda SCR-katalysator 270 i den fjarde passagen 256. Namnda ammoniaksensor 278 an anordnad for kommunikation med den forsta styrenheten 200 via en lank L278. Namnda ammoniaksensor 278 an anordnad att fortlopande faststalla en radande ammoniakhalt i NH3measured SCR-katalysatorn 270 eller i den fjarde passagen 256. Namnda ammoniaksensor 278 an anordnad att fortlopande skicka signaler S278 17 innefattande information om en radande ammoniakhalt NH3measured i SCRkatalysatorn 270 eller en radande ammoniakhalt NH3measured i namnda fjarde passage 256 till den forsta styrenheten 200 via lanken L278. Namnda ammoniaksensor 278 är korskanslig for NO2. Detta är en viktig aspekt av det uppfinningsmassiga fOrfarandet. An ammonia sensor 278 arranged at said SCR catalyst 270. According to an alternative embodiment of said ammonia sensor 278 arranged downstream of said SCR catalyst 270 in the fourth passage 256. Said ammonia sensor 278 is arranged for communication with the first control unit 200 via a long L278. Said ammonia sensor 278 arranged to continuously determine a radiating ammonia content in the NH3measured SCR catalyst 270 or in the fourth passage 256. Said ammonia sensor 278 arranged to continuously send signals S278 17 comprising information on a radiating ammonia content NH in said fourth passage 256 to the first control unit 200 via the line L278. Said ammonia sensor 278 is highly sensitive to NO2. This is an important aspect of the inventive process.

Den fbrsta styrenheten 200 är anordnad att fortlOpande eller intermittent faststalla en forsta NO2-halt NO2mod avseende NO2-gas hos avgaserna pa basis av en faststalld fOrsta NO,-halt N0,1 uppstrOms namnda DOC-enhet 260 och en faststalld omvandlingsgrad X rorande omvandling till NO2 hos avgasreningssystemet uppstroms namnda SCR-katalysator 270. Namnda omvandlingsgrad X kan faststallas pa basis av namnda faststallda avgastemperatur T1meas och/eller Ti cal och namnda faststallda avgasmassflode MF. Namnda omvandlingsgrad X kan faststallas fortlopande eller intermittent baserat pa relevanta faststallda varden av namnda faststallda avgastemperatur T1meas och/eller Ti cal och namnda faststallda avgasmassflode MF. Namnda omvandlingsgrad X kan faststallas fortlopande eller intermittent baserat pa en termisk troghet hos avgasreningssystemet. Namnda omvandlingsgrad X kan faststallas fortlopande eller intermittent baserat pa relevanta faststallda varden av namnda faststallda avgastemperatur T1meas och/eller Ti cal och namnda faststallda avgasmassflode MF och en termisk troghet hos avgasreningssystemet. Ett matt pa namnda termiska troghet kan modelleras/beraknas/uppskattas medelst den fbrsta styrenheten 200. Namnda omvandlingsgrad X anger i vilken grad NO-gas omvandlas till NO2-gas hos namnda DOC-enhet 260. The first control unit 200 is arranged to continuously or intermittently determine a first NO2 content NO2 mode with respect to NO2 gas of the exhaust gases on the basis of a determined first NO, content NO0.1 upstream of said DOC unit 260 and a fixed degree of conversion X concerning conversion to NO2 of the exhaust gas purification system upstream of said SCR catalyst 270. Said degree of conversion X can be determined on the basis of said determined exhaust gas temperature T1meas and / or Ti cal and said determined exhaust gas mass flow MF. Said degree of conversion X may be determined continuously or intermittently based on the relevant determined values of said determined exhaust gas temperature T1meas and / or Ti cal and said determined exhaust gas mass flow MF. Said degree of conversion X can be determined continuously or intermittently based on a thermal inertia of the exhaust gas purification system. Said degree of conversion X may be determined continuously or intermittently based on the relevant determined values of said determined exhaust gas temperature T1meas and / or Ti cal and said determined exhaust gas mass flow MF and a thermal inertia of the exhaust gas purification system. A measure of said thermal inertia can be modeled / calculated / estimated by means of the first control unit 200. Said degree of conversion X indicates the degree to which NO gas is converted to NO2 gas in said DOC unit 260.

Den fbrsta styrenheten 200 kan vara anordnad att modellera/berakna/faststalla namnda omvandlingsgrad X pa basis av namnda faststallda avgastemperatur Tlmeas och/eller Ti cal, namnda faststallda avgasmassflode MF och en termisk trOghet hos avgasreningssystemet. The first control unit 200 may be arranged to model / calculate / determine said degree of conversion X on the basis of said determined exhaust gas temperature Tlmeas and / or Ti cal, said determined exhaust gas mass flow MF and a thermal inertia of the exhaust gas purification system.

Namnda omvandlingsgrad X kan anges i procent (°/0). Said conversion degree X can be stated in percent (° / 0).

Harvid anges namnda forsta jamforelsehalt NO2mod är produkten av namnda faststallda forsta NOR-halt N0,1 och namnda omvandlingsgrad X. 18 N0,1*X=NO2mod Den forsta styrenheten 200 är anordnad att fortlopande eller intermittent faststalla en andra NO2-halt NO2measured has avgaserna pa basis av en faststalld ammoniakhalt 5 NH3measured has namnda SCR-enhet 270, eller i namnda fjarde passage 256, och en korskanslighetsfunktion F rorande NO2 for namnda NH3-sensor 278. In this case, said first comparative content NO2mod is the product of said determined first NOR content N0.1 and said degree of conversion X. 18 N0.1 * X = NO2mod The first control unit 200 is arranged to continuously or intermittently determine a second NO2 content NO2measured has the exhaust gases on the basis of a fixed ammonia content NH3measured has said SCR unit 270, or in said fourth passage 256, and a crossover function for NO2 for said NH3 sensor 278.

En korskanslighet rorande NO2 for namnda NH3-sensor 278 kan enligt ett alternativ faststallas pa basis av namnda faststallda avgastemperatur T1meas och/eller Ti cal, namnda faststallda avgasmassflode MF och ett matt pa termisk troghet i avgasreningssystemet. Namnda korskanslighet kan enligt ett annat alternativ faststallas pa basis av en radande driftpunkt/drifttillstand has namnda motor 231. Namnda korskanslighet kan faststallas fortlopande eller intermittent baserat pa relevanta faststallda varden av namnda faststallda avgastemperatur Tlmeas och/eller Ti cal och namnda faststallda avgasmassflode MF och/eller radande driftpunkt has namnda motor 231 och/eller och ett matt pa termisk troghet i avgasreningssystemet. Namnda korskanslighet anger ett matt pa korskansligheten for NO2 has namnda ammoniaksensor 278. Namnda korskanslighetsfunktion F kan faststallas pa lampligt satt pa basis av namnda korskanslighet. Namnda korskanslighetsfunktion F kan vara en forutbestamd korskanslighetsfunktion Den forsta styrenheten 200 är anordnad att modellera/berakna/faststalla namnda korskanslighet pa basis av namnda faststallda avgastemperatur Tlmeas och/eller Ti cal och namnda faststallda avgasmassflOde MF och/eller namnda radande drifttillstand has namnda motor 231 och/eller och ett matt pa termisk troghet i avgasreningssystemet. A crucifixion touching NO2 for said NH3 sensor 278 can alternatively be determined on the basis of said determined exhaust gas temperature T1meas and / or Ti cal, said determined exhaust gas mass flow MF and a measure of thermal inertia in the exhaust gas purification system. According to another alternative, said cross-sensitivity can be determined on the basis of a radiating operating point / operating state, said engine 231. Said cross-sensitivity can be determined continuously or intermittently based on relevant determined values of said determined exhaust temperature Tlmeas and / or Ti cal and said determined exhaust mass flow and MF or radiating operating point has said motor 231 and / or and a mat of thermal inertia in the exhaust purification system. Said cross-sensitivity indicates a measure of the cross-sensitivity of NO2 has the said ammonia sensor 278. Said cross-sensitivity function F can be determined in an appropriate manner on the basis of said cross-sensitivity. Said cross-sensitivity function F may be a predetermined cross-sensitivity function. The first control unit 200 is arranged to model / calculate / determine said cross-sensitivity on the basis of said fixed exhaust gas temperature Tlmeas and / or Ti cal and said fixed exhaust mass flow MF and / or said line. / or and a measure of thermal inertia in the exhaust purification system.

Namnda korskanslighetsfunktion F kan anges pa lampligt satt. The named cross-sensitivity function F can be specified in an appropriate manner.

Harvid anges namnda andra NO2-halt NO2measured är produkten av namnda faststallda NH3-halt NH3measured och namnda korskanslighetsfunktion F. In this case, said second NO2 content NO2measured is the product of said determined NH3 content NH3measured and said cross-probability function F.

NH3measured*F=NO2measured 19 Enligt en aspekt av foreliggande uppfinning anvands namnda forsta NO2-halt NO2mod och namnda andra NO2-halt NO2measured for att bedoma prestanda hos namnda DOC-enhet 260. For det fall namnda forsta NO2-halt NO2mod och namnda andra NO2-halt NO2measured skiljer sig at alltfor mycket kan det faststallas att namnda DOC-enhet 260 är defekt till en viss grad. Storleken has en absolut skillnad mellan namnda forsta NO2-halt NO2mod och namnda andra NO2-halt NO2measured kan ange ett matt pa i vilken grad namnda DOC-enhet 260 är defekt. NH3measured * F = NO2measured 19 According to one aspect of the present invention, said first NO2 content NO2mod and said second NO2 content NO2measured are used to assess the performance of said DOC unit 260. In that case, said first NO2 content NO2mod and said second NO2 content NO2measured differs in that too much it can be established that the said DOC unit 260 is defective to a certain degree. The size has an absolute difference between said first NO2 content NO2mod and said second NO2 content NO2measured can indicate a measure of the degree to which said DOC unit 260 is defective.

Den fbrsta styrenheten 200 är enligt ett utfOrande anordnad att upphbra med en reduktionsmedelstillforsel till namnda avgaser for att mojliggora korrekt prestandakontroll av namnda DOC-enhet 260 enligt en aspekt av det uppfinningsmassiga forfarandet. According to one embodiment, the first control unit 200 is arranged to cease with a supply of reducing agent to said exhaust gases in order to enable correct performance control of said DOC unit 260 according to an aspect of the method according to the invention.

Den forsta styrenheten 200 kan vara anordnad att styra tomning av namnda SCR- katalysator 270 pa reduktionsmedel genom att avbryta/forhindra dosering medelst namnda doseringsenhet 250. The first control unit 200 may be arranged to control emptying of the SCR catalyst 270 on reducing agent by interrupting / preventing dosing by means of said dosing unit 250.

Den forsta styrenheten 200 kan vara anordnad att faststalla en forsta NO2-halt NO2mod has avgaserna pa basis av en faststalld NOR-halt NOxl uppstroms namnda DOC-enhet 260 och en faststalld omvandlingsgrad X rorande omvandling till NO2 has avgasreningssystemet uppstroms namnda SCR-katalysator 270. The first control unit 200 may be arranged to determine a first NO2 content NO2 mode has the exhaust gases on the basis of a fixed NOR content NOx1 upstream of said DOC unit 260 and a fixed conversion degree X concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst 270.

Den forsta styrenheten 200 kan vara anordnad att faststalla en andra NO2-halt NO2measured has avgaserna pa basis av en medelst namnda korskansliga NH3- sensor 278 faststalld NH3-halt NH3measured och en korskanslighetsfunktion F rbrande NO2 fOr namnda NH3-sensor 278. Den fOrsta styrenheten 200 kan vara anordnad att bedoma prestanda has namnda DOC-enhet 260 pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured. The first control unit 200 may be arranged to determine a second NO2 content NO2measured has the exhaust gases on the basis of an NH3 content NH3measured determined by means of said cruciform NH3 sensor 278 and a crucifixion function for burning NO2 for said NH3 sensor 278. The first control unit 200 may be arranged to assess the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2mod and said determined second NO2 content NO2measured.

Den forsta styrenheten 200 kan vara anordnad att faststalla namnda omvandlingsgrad X has avgasreningssystemet namnda SCR-katalysator 270 genom berakning inbegripande parametrarna avgastemperatur T1meas och/eller Ti cal, avgasmassflode MF och ett matt pa termisk troghet i avgasreningssystemet. The first control unit 200 may be arranged to determine the degree of conversion X has the exhaust gas purification system said SCR catalyst 270 by calculating including the parameters exhaust temperature T1meas and / or Ti cal, exhaust gas mass flow MF and a measure of thermal inertia in the exhaust gas purification system.

Den forsta styrenheten 200 kan vara anordnad att faststalla namnda korskanslighet rorande NO2 for namnda NH3-sensor 278 baserat pa en aktuell driftpunktangivelse avseende namnda motor 231 alstrande namnda avgaser och/eller avgassammansattning och/eller avgastemperatur. Den forsta styrenheten 200 kan vara anordnad att faststalla namnda avgassammansattning pa lampligt satt, exempelvis genom modellering/berakning/uppskattning pa basis av lampliga parametrar. The first control unit 200 may be arranged to determine said cross-sensitivity of NO2 for said NH3 sensor 278 based on a current operating point indication regarding said engine 231 producing said exhaust gases and / or exhaust gas composition and / or exhaust gas temperature. The first control unit 200 may be arranged to determine said exhaust composition in an appropriate manner, for example by modeling / calculation / estimation on the basis of appropriate parameters.

Den forsta styrenheten 200 kan vara anordnad att faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator 270 uppnatts genom att mata namnda forsta NOx-halt N0x1 uppstroms namnda DOC-enhet 260 och att mata namnda andra NOx-halt NO2 nedstrOms namnda SCR-katalysator 270. Den fOrsta styrenheten 200 kan vara anordnad att taga i huvudsak overensstammande varden hos de bada NOx-halterna som kriterium pa att avsedd tbmning uppnatts. The first control unit 200 may be arranged to determine that the intended emptying of reducing agent of said SCR catalyst 270 has been achieved by feeding said first NOx content NOx1 upstream of said DOC unit 260 and feeding said second NOx content NO2 downstream of said SCR catalyst. 270. The first control unit 200 may be arranged to take substantially the corresponding value of the two NOx levels as a criterion that the intended emptying has been achieved.

Enligt ett utforande är den forsta styrenheten 200 anordnad att berakna/modellera/uppskatta/faststalla att avsedd tOmning av reduktionsmedel hos namnda SCR-katalysator 270 uppnatts. Detta kan ske medelst en i ett minne inlagrad berakningsmodell. Den fOrsta styrenheten 200 kan vara anordnad att berakna/modellera/uppskatta/faststalla att tomning av reduktionsmedel hos namnda SCR-katalysator 270 uppnatts pa basis av atminstone flagon av parametrarna avgastemperatur (Ti cal, Tlmeas) avgasmassflode MF, termisk troghet hos avgasreningssystemet och namnda forsta NOx-halt N0x1 uppstroms namnda DOCenhet 260. Namnda berakning baseras enligt en utforingsform pa atminstone en av namnda parametrar dá tillforsel av reduktionsmedel har avbrutits och vasentligen inget reduktionsmedel är inlagrat i SCR-katalysatorn. Den forsta styrenheten 200 kan vara anordnad att faststalla/modellera/berakna/uppskatta ett matt pa termisk troghet i avgasreningssystemet. Ett matt pa termisk troghet kan vara forutbestamt och vara inlagrat i ett minne i den forsta styrenheten 200. According to one embodiment, the first control unit 200 is arranged to calculate / model / estimate / determine that the intended emptying of reducing agent of said SCR catalyst 270 has been achieved. This can be done by means of a calculation model stored in a memory. The first control unit 200 may be arranged to calculate / model / estimate / determine that emptying of reducing agent of said SCR catalyst 270 has been achieved on the basis of at least flag of the parameters exhaust temperature (Ti cal, Tlmeas) exhaust mass flow MF, thermal inertia of the exhaust purification system NOx content NOx1 upstream of said DOC unit 260. Said calculation is based according to an embodiment on at least one of said parameters when the supply of reducing agent has been interrupted and essentially no reducing agent is stored in the SCR catalyst. The first control unit 200 may be arranged to determine / model / calculate / estimate a measure of thermal inertia in the exhaust gas purification system. A measure of thermal integrity may be predetermined and stored in a memory in the first controller 200.

Den forsta styrenheten 200 kan vara anordnad att bedoma prestanda hos namnda DOC-enhet 260 pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured, varvid en kvot mellan namnda forsta NO2- 21 halt NO2mod och namnda andra NO2-halt NO2measured skall ligga utanfor ett forutbestamt intervall I for att indikera att bristande prestanda hos namnda DOCenhet 260 foreligger. The first control unit 200 may be arranged to judge the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2mod and said determined second NO2 content NO2measured, a ratio between said first NO2-21 content NO2mod and said second NO2 content NO2measured shall be outside a predetermined interval I to indicate that there is a lack of performance of the said DOC unit 260.

Den forsta styrenheten 200 kan vara anordnad att bedoma prestanda hos namnda DOC-enhet 260 pa basis av namnda faststallda fOrsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured, varvid en absolut skillnad, INO2 mod— NO2measured, mellan namnda fOrsta NO2-halt NO2mod och namnda andra NO2-halt NO2measured overstigande ett forutbestamt troskelvarde TH1 indikerar bristande prestanda has namnda DOC-enhet 260. The first control unit 200 may be arranged to judge the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2 mode and said determined second NO2 content NO2measured, an absolute difference, INO2 mode— NO2measured, between said first NO2- content NO2mod and said other NO2 content NO2measured exceeding a predetermined threshold value TH1 indicates poor performance has said DOC unit 260.

Presentationsorgan 220 är anordnade for kommunikation med namnda forsta styrenhet 200 via en lank L220. Den forsta styrenheten 200 är anordnad att presentera ett resultat av namnda prestandakontrol av namnda DOC-enhet 260. Namnda resultat kan exempelvis anvisa "fullgod funktion" eller "defekt". Exempelvis kan en grad av funktionsnedsattning hos namnda DOC-enhet presenteras, denna grad av funktionsnedsattning kan anges i procent. Namnda presentationsorgan 220 kan inbegripa hogtalare for att aterge syntetiserad rost eller annan audiell aterkoppling. Namnda presentationsorgan 220 kan inbegripa en visningsskarm, exempelvis en s.k. pekskarm for visuell aterkoppling av namnda resultat. Presenting means 220 are arranged for communication with said first control unit 200 via a long L220. The first control unit 200 is arranged to present a result of said performance control of said DOC unit 260. Said result may, for example, indicate "satisfactory function" or "defective". For example, a degree of disability of the said DOC unit can be presented, this degree of disability can be stated in percent. Said display means 220 may include loudspeakers for reproducing synthesized rust or other audible feedback. Said display means 220 may include a display screen, for example a so-called touch screen for visual feedback of the said result.

Enligt en utforingsform av det uppfinningsmassiga forfarandet och systemet for prestandakontroll av namnda DOC-enhet 260 kan namnda ammoniaksensor 278 inbegripa en NOR-sensor for att mata en radande NOR-halt i avgasstrommen fran namnda motor. Namnda inbyggda NOR-sensor kan harvid vara anordnad att faststalla en radande NO2-halt dar namnda ammoniaksensor 278 är forefintligt anordnad. Harvid skulle ett alternativt utforande av foreliggande uppfinning inbegripa att faststalla namnda andra NO2-halt och anvanda detta matt i stallet for namnda medelst namnda korskanslighetsfunktion faststallda andra NO2-halt NO2measured som underlag for att bedoma prestanda hos namnda DOC-enhet 260. Enligt en variant kan detta alternativa utforande utgora ett komplement till att anvanda namnda korskanslighetsfunktion F for faststallande av namnda NO2-halt NO2measured. 22 Figur 4a illustrerar schematiskt ett flodesschema over ett forfarande for prestandakontroll av en DOC-enhet 260 has ett avgasreningssystem innefattande en forsta NOR-sensor 221 uppstroms namnda DOC-enhet 260 och en SCR-katalysator 270 nedstroms namnda DOC-enhet 260. Forfarandet innefattar ett forsta fOrfarandesteg s401. Steget s401 inbegriper stegen att: - i huvudsak tomma namnda SCR-katalysator 270 pa reduktionsmedel; - faststalla en fOrsta NO2-halt NO2mod has avgaserna pa basis av en faststalld NON-halt uppstroms namnda DOC-enhet 260 och en faststalld omvandlingsgrad X rOrande omvandling till NO2 has avgasreningssystemet uppstrOms namnda SCR- katalysator 270; - faststalla en andra NO2-halt NO2measured has avgaserna pa basis av en medelst en korskanslig NH3-sensor 278 faststalld NH3-halt och en korskanslighetsfunktion F rorande NO2 for namnda NH3-sensor 278; och - bedoma prestanda has namnda DOC-enhet 260 pa basis av namnda faststallda forsta NO2-halt NO2 NO2mod och namnda faststallda andra NO2-halt NO2measured. Efter forfarandesteget s401 avslutas forfarandet. According to one embodiment of the inventive method and system for performance control of said DOC unit 260, said ammonia sensor 278 may include a NOR sensor for feeding a radiating NOR content into the exhaust stream from said engine. Said built-in NOR sensor can then be arranged to determine a radiating NO2 content where said ammonia sensor 278 is presently arranged. In this case, an alternative embodiment of the present invention would involve determining said second NO2 content and using this mat instead of said second NO2 content NO2measured determined by means of said crucifixion function as a basis for assessing the performance of said DOC unit 260. According to a variant, this alternative embodiment constitutes a complement to using said cross-probability function F for determining said NO2 content NO2measured. Figure 4a schematically illustrates a flow chart of a performance control method of a DOC unit 260 having an exhaust gas purification system comprising a first NOR sensor 221 upstream of said DOC unit 260 and an SCR catalyst 270 downstream of said DOC unit 260. The method comprises a first stepS401. Step s401 includes the steps of: - substantially emptying said SCR catalyst 270 on reducing agent; determining a first NO2 content NO2mod has the exhaust gases on the basis of a fixed NON content upstream of said DOC unit 260 and a fixed conversion rate X concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst 270; determining a second NO2 content NO2measured has the exhaust gases on the basis of an NH3 content determined by means of a crucible NH3 sensor 278 and a crucifixion function concerning NO2 for said NH3 sensor 278; and - assessing performance, said DOC unit 260 is based on said determined first NO2 content NO2 NO2mod and said determined second NO2 content NO2measured. After procedure step s401, the procedure is terminated.

Figur 4b illustrerar schematiskt ett flodesschema over ett forfarande for prestandakontroll av en DOC-enhet 260 has ett avgasreningssystem innefattande en 20 forsta NO,-sensor 221 uppstroms namnda DOC-enhet 260 och en SCR-katalysator 270 nedstroms namnda DOC-enhet 260. Figure 4b schematically illustrates a flow chart of a performance control method of a DOC unit 260 having an exhaust gas purification system comprising a first NO 1 sensor 221 upstream of said DOC unit 260 and an SCR catalyst 270 downstream of said DOC unit 260.

FOrfarandet innefattar ett forsta forfarandesteg s410. Forfarandesteget s410 kan inbegripa steget att i huvudsak tOmma namnda SCR-katalysator 270 pa reduktionsmedel. The method comprises a first method step s410. Process step s410 may include the step of substantially emptying said SCR catalyst 270 on reducing agent.

Forfarandesteget s410 kan inbegripa steget att stanga av reduktionsmedeldosering medelst namnda doseringsenhet 250 och vanta en forutbestamd tid innan forfarandet fortskrider. The process step s410 may include the step of switching off the reducing agent dosing by means of said dosing unit 250 and waiting a predetermined time before the process proceeds.

FOrfarandesteget s410 kan inbegripa steget att faststalla att avsedd tomning av reduktionsmedel has namnda SCR-katalysator 270 uppnatts genom att mata namnda forsta NO,-halt uppstroms namnda DOC-enhet 260 och att mata en andra 23 NOx-halt nedstroms namnda SCR-katalysator. Om varden hos de bada NOx-halterna är vasentligen lika kan detta tagas som kriterium pa att avsedd tomning uppnatts. The process step s410 may include the step of determining that the intended emptying of reducing agent has achieved said SCR catalyst 270 by feeding said first NO 2 content upstream of said DOC unit 260 and feeding a second 23 NOx content downstream of said SCR catalyst. If the value of the two NOx levels is substantially equal, this can be taken as a criterion that the intended emptying has been achieved.

Forfarandesteget s410 kan inbegripa steget att berakna/modellera/uppskatta/faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator 270 uppnatts. Detta kan ske medelst en i ett minne inlagrad berakningsmodell hos den forsta styrenheten 200. Den forsta styrenheten 200 kan vara anordnad att berakna/modellera/uppskatta/faststalla att tomning av reduktionsmedel has namnda SCR-katalysator 270 uppnatts pa basis av atminstone flagon av parametrarna avgastemperatur (T1cal, T1meas), avgasmassflode MF, termisk trOghet has avgasreningssystemet och namnda fOrsta NO,-halt N0x1 uppstroms namnda DOC-enhet 260. Namnda berakning baseras enligt en utfOringsform pa atminstone en av namnda parametrar Ida tillfbrsel av reduktionsmedel har avbrutits och vasentligen inget reduktionsmedel är inlagrat i SCR-katalysatorn. Process step s410 may include the step of calculating / modeling / estimating / determining that the intended emptying of reducing agent of said SCR catalyst 270 has been achieved. This can be done by means of a memory model of the first control unit 200 stored in a memory. The first control unit 200 can be arranged to calculate / model / estimate / determine that emptying of reducing agent has the said SCR catalyst 270 achieved on the basis of at least flag of the exhaust gas parameters (T1cal, T1meas), exhaust gas mass flow MF, thermal inertia has the exhaust gas purification system and said first NO, content NOx1 upstream of said DOC unit 260. Said calculation is based according to an embodiment on at least one of said parameters Ida supply of reducing agent and has no detergent is stored in the SCR catalyst.

Efter fOrfarandesteget s410 utfbrs ett efterfOljande forfarandesteg s420. After the procedure step s410, a subsequent procedure step s420 is performed.

Forfarandesteget s420 innefattar steget att faststalla s420 en forsta NO2-halt NO2mod has avgaserna pa basis av en faststalld NOx-halt uppstroms namnda DOCenhet 260 och en faststalld omvandlingsgrad X rorande omvandling till NO2 has avgasreningssystemet uppstroms namnda SCR-katalysator 270. The process step s420 comprises the step of determining s420 a first NO2 content NO2mod has the exhaust gases on the basis of a determined NOx content upstream of said DOC unit 260 and a determined conversion rate X concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst 270.

Forfarandesteget s420 kan inbegripa att faststalla namnda omvandlingsgrad X pa 25 basis av uppgift am ett radande avgasmassflode MF och en radande temperatur has avgaser uppstroms namnda DOC-enhet 260. Namnda omvandlingsgrad X kan modelleras/beraknas/uppskattas/faststallas pa lampligt satt. The process step s420 may comprise determining said degree of conversion X on the basis of information in a radiating exhaust mass flow MF and a radiating temperature has exhaust gases upstream of said DOC unit 260. Said degree of conversion X may be modeled / calculated / estimated / determined in an appropriate manner.

Efter forfarandesteget s420 utfors ett efterfoljande forfarandesteg s430. After the procedure step s420, a subsequent procedure step s430 is performed.

FOrfarandesteget s430 innefattar steget att faststalla en andra NO2-halt NO2measured has avgaserna pa basis av en medelst en korskanslig NH3-sensor 27 24 faststalld NH3-halt och en korskanslighetsfunktion F rorande NO2 for namnda NH3sensor 275. The process step s430 comprises the step of determining a second NO2 content NO2measured has the exhaust gases on the basis of an NH3 content determined by means of a crucible NH3 sensor 27 and a crucifixion function for NO2 for said NH3 sensor 275.

Forfarandesteget s430 kan inbegripa att faststalla namnda korskanslighet rorande 5 NO2 for namnda NH3-sensor 278 pa basis av uppgift om ett radande avgasmassflode MF och en radande temperatur hos avgaser uppstroms namnda DOC-enhet 260. FOrfarandesteget s430 kan inbegripa att faststalla namnda korskanslighet rarande NO2 for namnda NH3-sensor 278 pa basis av atminstone flagon av: uppgift om ett radande avgasmassflOde MF, en radande temperatur hos avgaser uppstrOms 10 namnda DOC-enhet 260, termisk troghet hos avgasreningssystemet och avgassammansattning. Forfarandesteget s430 kan inatt faststalla namnda korskanslighet rorande NO2 for namnda NH3-sensor 278 pa basis av uppgift om ett radande drifttillstand hos fordonet 100 och/eller drifttillstand hos motorn 231. Namnda korskanslighet trande NO2 for namnda NH3-sensor 278 kan modelleras/beraknas/uppskattas/faststallas pa lampligt satt. The process step s430 may comprise determining said cross-sensitivity touching NO2 for said NH3 sensor 278 on the basis of information of a radiating exhaust mass flow MF and a radiating temperature of exhaust gases upstream of the said DOC unit 260. The process step s430 may comprise determining the NO2 sensor2. said NH3 sensor 278 on the basis of at least a flag of: indicating a radiating exhaust mass flow MF, a radiating temperature of exhaust gases upstream of said DOC unit 260, thermal inertia of the exhaust purification system and exhaust composition. The process step s430 can tonight determine said crucifixion concerning NO2 for said NH3 sensor 278 on the basis of information about a radiating operating state of the vehicle 100 and / or operating state of the engine 231. Said crucifixion concerning NO2 for said NH3 sensor 278 can be modeled / calculated / estimated / determined in an appropriate manner.

Efter forfarandesteget s430 utfors ett efterfoljande forfarandesteg s440. After the step step s430, a subsequent step s440 is performed.

Steget s440 kan inbegripa steget att bedoma prestanda hos namnda DOC-enhet 260 20 pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured. Detta kan utforas pa ett antal olika satt. Step s440 may include the step of judging the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2 mode and said determined second NO2 content NO2measured. This can be done in a number of different ways.

Enligt ett exempel kan prestanda hos namnda DOC-enhet bedOmas pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured, varvid en kvot mellan namnda forsta NO2-halt NO2mod och namnda andra NO2-halt NO2measured skall ligga utanfOr ett fOrutbestamt intervall fOr att indikera att bristande prestanda hos namnda DOC-enhet 260 foreligger. According to an example, the performance of said DOC unit can be judged on the basis of said determined first NO2 content NO2mod and said determined second NO2 content NO2measured, whereby a ratio between said first NO2 content NO2mod and said second NO2 content NO2measured shall be outside a predetermined interval to indicate that there is a lack of performance of said DOC unit 260.

Enligt ett exempel kan prestanda hos namnda DOC-enhet bedomas pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt, varvid en absolut skillnad mellan namnda fOrsta NO2-halt och namnda andra NO2halt NO2measured overstigande ett forutbestamt troskelvarde indikerar bristande prestanda hos namnda DOC-enhet 260. According to one example, the performance of said DOC unit may be judged on the basis of said determined first NO2 content NO2mod and said determined second NO2 content, an absolute difference between said first NO2 content and said second NO2 content NO2measured exceeding a predetermined threshold value indicating deficiency performance of said DOC unit 260.

Efter forfarandesteget s440 utfors ett efterfoljande forfarandesteg s450. After the step step s440, a subsequent step step s450 is performed.

Forfarandesteget s450 innefattar steget att presentera ett resultat av namnda prestandakontroll av namnda DOC-enhet 260. Detta kan ske medelst namnda presentationsorgan 220 och namnda forsta styrenhet 200. Harvid kan en resultat avseende namnda en radande prestanda hos namnda DOC-enhet 260 presenteras kir exempelvis en operatOr has fordonet 100 eller servicepersonal. Namnda resultat kan exempelvis inbegripa uppgift om namnda DOC-enhet 260 uppvisar fullgod funktion, begransad funktion eller obefintlig funktion, avseende omvandlingsgrad eller annan prestanda. Efter forfarandesteget s450 utfors ett efterfoljande forfarandesteg s460. The process step s450 comprises the step of presenting a result of said performance control of said DOC unit 260. This may be done by said display means 220 and said first control unit 200. In this case, a result concerning said radiating performance of said DOC unit 260 may be presented as e.g. operator has the vehicle 100 or service personnel. Said results may, for example, include information on whether said DOC unit 260 exhibits satisfactory function, limited function or non-existent function, with respect to degree of conversion or other performance. After the step step s450, a subsequent step step s460 is performed.

Forfarandesteget s460 innefattar steget att vidtaga atminstone en atgard has fordonet 100 och/eller avgassystemet och/eller delsystemet 299 och/eller delsystemet 289 och/eller ett annat system som for forknippat med fordonet 100. The process step s460 comprises the step of taking at least one action having the vehicle 100 and / or the exhaust system and / or the subsystem 299 and / or the subsystem 289 and / or another system associated with the vehicle 100.

Namnda atgard kan faststallas pa basis av namnda bedomning av prestanda has namnda DOC-enhet 260. Namnda atgard kan faststallas pa basis av uppgift om en degraderings storlek avseende bedomd prestanda has namnda DOC-enhet 260. The said action can be determined on the basis of the said assessment of performance has the said DOC unit 260. The said action can be determined on the basis of information on the size of a degradation regarding the assessed performance has the said DOC unit 260.

For ett fall dar namnda degraderings storlek overstiger ett forutbestamt varde/matt kan namnda DOC-enhet 260 diagnostiseras vara "defekt". Att diagnostisera namnda DOC-enhet 260 varande defekt är harvid att faststalla en atgard. In a case where the magnitude of said degradation exceeds a predetermined value / mat, said DOC unit 260 can be diagnosed as "defective". To diagnose the said DOC unit 260 as defective is to determine an action.

Ett annat exempel pa atgard kan vara att styra SCR-reglering pa basis av namnda 25 degraderings storlek avseende namnda DOC-enhet 260. For det fall namnda DOCenhet 260 i en viss grad är funktionsmassigt nedsatt kan exempelvis Overdosering av reduktionsmedel medelst namnda doseringsenhet 250 utforas, i kompensationssyfte. Another example of action may be to control SCR control on the basis of the size of said degradation with respect to said DOC unit 260. In case said DOC unit 260 is to some extent functionally impaired, for example overdosing of reducing agent by means of said dosing unit 250 can be performed. for compensatory purposes.

Ett annat exempel pa atgard kan vara att aktivt styra drift av fordonets motor 231 pa 30 basis av namnda degraderings storlek avseende namnda DOC-enhet 260 for att undvika drift av motorn 231 i vissa oonskade driftpunkter. Another example of action may be to actively control the operation of the engine 231 of the vehicle on the basis of the magnitude of said degradation with respect to said DOC unit 260 in order to avoid operation of the engine 231 at certain undesired operating points.

Efter forfarandesteget s460 avslutas forfarandet. 26 Med hanvisning till Figur 5, visas ett diagram av ett utforande av en anordning 500. Styrenheterna 200 och 210 som beskrivs med hanvisning till Figur 2 och Figur 3 kan i ett utforande innefatta anordningen 500. Anordningen 500 innefattar ett icke-flyktigt minne 520, en databehandlingsenhet 510 och ett las/skriv-minne 550. Det icke- flyktiga minnet 520 har en fOrsta minnesdel 530 van i ett datorprogram, sä som ett operativsystem, är lagrat for att styra funktionen has anordningen 500. Vidare innefattar anordningen 500 en buss-controller, en seriell kommunikationsport, I/0- organ, en A/D-omvandlare, en tids- och datum inmatnings- och overforingsenhet, en handelseraknare och en avbrytningscontroller (ej visade). Det icke-flyktiga minnet 520 har ocksa en andra minnesdel 540. After the step step s460, the procedure is terminated. Referring to Figure 5, there is shown a diagram of an embodiment of a device 500. The controllers 200 and 210 described with reference to Figure 2 and Figure 3 may in one embodiment include the device 500. The device 500 includes a non-volatile memory 520. a data processing unit 510 and a read / write memory 550. The non-volatile memory 520 has a first memory portion 530 used in a computer program, such as an operating system, stored to control the operation of the device 500. Further, the device 500 includes a bus memory. controller, a serial communication port, I / O means, an A / D converter, a time and date input and transfer unit, a trade calculator and an interrupt controller (not shown). The non-volatile memory 520 also has a second memory portion 540.

Det tillhandahalles ett datorprogram P for styrning av prestandakontroll av en DOCenhet 260 has ett avgasreningssystem innefattande en forsta NOR-sensor 237 uppstroms namnda DOC-enhet 260 och en SCR-katalysator 270 nedstroms namnda 15 DOC-enhet 260. A computer program P is provided for controlling the performance control of a DOC unit 260 having an exhaust gas purification system comprising a first NOR sensor 237 upstream of said DOC unit 260 and an SCR catalyst 270 downstream of said DOC unit 260.

Datorprogrammet P kan innefatta rutiner for att styra ett tomningsforfarande for namnda SCR-katalysator 270 for att i huvudsak tomma SCR-katalysatorn 270 pa reduktionsmedel. The computer program P may include routines for controlling an emptying process for the SCR catalyst 270 to substantially empty the SCR catalyst 270 of reducing agent.

Datorprogrammet P kan innefatta rutiner for att faststalla en forsta NO2-halt NO2mod has avgaserna pa basis av en faststalld NOR-halt NOR1 uppstroms namnda DOCenhet 260 och en faststalld omvandlingsgrad X rorande omvandling till NO2 has avgasreningssystemet uppstroms namnda SCR-katalysator 270. The computer program P may comprise routines for determining an initial NO2 content NO2 mode has the exhaust gases on the basis of a fixed NOR content NOR1 upstream of said DOC unit 260 and a fixed conversion degree X concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst 270.

Datorprogrammet P kan innefatta rutiner kir att faststalla en andra NO2-halt NO2measured has avgaserna pa basis av en medelst en korskanslig NH3-sensor 278 faststalld NH3-halt NH3measured och en korskanslighetsfunktion F rorande NO2 for namnda NH3-sensor 278. The computer program P may comprise routines for determining a second NO2 content NO2measured has the exhaust gases on the basis of an NH3 content NH3measured determined by means of a crucible NH3 sensor 278 and a crucifixion function concerning NO2 for said NH3 sensor 278.

Datorprogrammet P kan innefatta rutiner for att bedoma prestanda has namnda DOC-enhet 260 pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured. 27 Datorprogrammet P kan innefatta rutiner for att faststalla namnda omvandlingsgrad X has avgasreningssystemet uppstroms namnda SCR-katalysator 270 genom berakning inbegripande parametrarna avgastemperatur Tlmeas, Ti cal, avgasmassflode MF och ett matt pa termisk troghet has avgasreningssystemet. The computer program P may comprise routines for assessing the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2 mode and said determined second NO2 content NO2measured. The computer program P may include routines for determining said degree of conversion X has the exhaust gas purification system upstream of said SCR catalyst 270 by calculating the exhaust temperature parameters Tlmeas, Ti cal, exhaust mass flow MF and a mat of thermal inertia has the exhaust gas purification system.

Datorprogrammet P kan innefatta rutiner for att faststalla namnda korskanslighet rorande NO2 for namnda NH3-sensor 278 baserat pa en aktuell driftpunktangivelse avseende en motor 231 alstrande namnda avgaser. The computer program P may comprise routines for determining said cross-probability of NO2 for said NH3 sensor 278 based on a current operating point indication regarding an engine 231 generating said exhaust gases.

Datorprogrammet P kan innefatta rutiner for att faststalla namnda korskanslighetsfunktion F rorande NO2 for namnda NH3-sensor 278 baserat pa en aktuell driftpunktangivelse avseende en motor 231 alstrande namnda avgaser. The computer program P may include routines for determining said crossover function F concerning NO2 for said NH3 sensor 278 based on a current operating point indication regarding an engine 231 generating said exhaust gases.

Datorprogrammet P kan innefatta rutiner for att faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator 270 uppnatts genom att mata namnda forsta NOR-halt NOR1 uppstroms namnda DOC-enhet 260 och att mata en andra NOR-halt NOR2 nedstroms namnda SCR-katalysator 270. Datorprogrammet P kan innefatta rutiner for att taga i huvudsak overensstammande varden hos de bada NOR-halterna som kriterium pa att avsedd tOmning uppnatts. The computer program P may comprise routines for determining that the intended emptying of reducing agent of said SCR catalyst 270 has been achieved by feeding said first NOR content NOR1 upstream of said DOC unit 260 and feeding a second NOR content NOR2 downstream of said SCR catalyst 270. The computer program P may include routines for taking substantially consistent values of the two NOR levels as a criterion for achieving the intended emptying.

Datorprogrammet P kan innefatta rutiner for att: - faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator 270 uppnatts genom att modellera/berakna namnda forsta NOR-halt NOR1 uppstroms namnda DOC-enhet 260 och att mata en andra NOR-halt NO2 nedstroms namnda 25 SCR-katalysator 270; och - taga i huvudsak overensstammande varden has de bada NOR-halterna som kriterium pa att avsedd tomning uppnatts. The computer program P may comprise routines for: - determining that the intended emptying of reducing agent of said SCR catalyst 270 has been achieved by modeling / calculating said first NOR content NOR1 upstream of said DOC unit 260 and feeding a second NOR content NO2 downstream of said SCR Catalyst 270; and - take the substantially consistent value, the two NOR levels have as a criterion that the intended emptying has been achieved.

Datorprogrammet P kan innefatta rutiner for att berakna/modellera/uppskatta/faststalla att avsedd tomning av reduktionsmedel hos 30 namnda SCR-katalysator 270 uppnatts. 28 Datorprogrammet P kan innefatta rutiner for att bedorna prestanda hos namnda DOC-enhet 260 pa basis av namnda faststallda forsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured, varvid en kvot mellan namnda forsta NO2halt NO2mod och namnda andra NO2-halt NO2measured skall ligga utanfor ett forutbestamt intervall I for att indikera att bristande prestanda hos namnda DOC- enhet 260 foreligger. The computer program P may comprise routines for calculating / modeling / estimating / determining that the intended emptying of reducing agent of said SCR catalyst 270 has been achieved. The computer program P may comprise routines for improving the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2mod and said determined second NO2 content NO2measured, wherein a ratio between said first NO2 content NO2mod and said second NO2 content NO2measured shall be outside a predetermined interval I to indicate that there is a lack of performance of the said DOC unit 260.

Datorprogrammet P kan innefatta rutiner for att bedorna prestanda hos namnda DOC-enhet 260 pa basis av namnda faststallda fOrsta NO2-halt NO2mod och namnda faststallda andra NO2-halt NO2measured, varvid en absolut skillnad mellan namnda forsta NO2-halt NO2mod och namnda andra NO2-halt NO2measured overstigande ett forutbestamt troskelvarde TH1 indikerar bristande prestanda hos namnda DOCenhet 260. The computer program P may comprise routines for improving the performance of said DOC unit 260 on the basis of said determined first NO2 content NO2 mode and said determined second NO2 content NO2measured, an absolute difference between said first NO2 content NO2 mode and said second NO2 mode. NO2measured content exceeding a predetermined threshold value TH1 indicates poor performance of the said DOC unit 260.

Programmet P kan vara lagrat pa ett exekverbart vis eller pa komprimerat vis i ett minne 560 och/eller i ett las/skrivminne 550. The program P can be stored in an executable manner or in a compressed manner in a memory 560 and / or in a read / write memory 550.

Nar det är beskrivet att databehandlingsenheten 510 utfor en viss funktion ska det forstas att databehandlingsenheten 510 utfor en viss del av programmet vilket är lagrat i minnet 560, eller en viss del av programmet som ar lagrat i las/skrivminnet 550. When it is described that the data processing unit 510 performs a certain function, it should be understood that the data processing unit 510 performs a certain part of the program which is stored in the memory 560, or a certain part of the program which is stored in the read / write memory 550.

Databehandlingsanordningen 510 kan kommunicera med en dataport 599 via en databuss 515. Det icke-flyktiga minnet 520 är avsett fOr kommunikation med databehandlingsenheten 510 via en databuss 512. Det separata minnet 560 är avsett att kommunicera med databehandlingsenheten 510 via en databuss 511. Las/skrivminnet 550 är anordnat att kommunicera med databehandlingsenheten 510 via en databuss 514. Till dataporten 599 kan t.ex. lankarna L210, L220, L233, L237, L250, L277, L278, och L292 anslutas (se Figur 2 och Figur 3). The data processing device 510 can communicate with a data port 599 via a data bus 515. The non-volatile memory 520 is intended for communication with the data processing unit 510 via a data bus 512. The separate memory 560 is intended to communicate with the data processing unit 510 via a data bus 511. Read / write memory 550 is arranged to communicate with the data processing unit 510 via a data bus 514. To the data port 599, e.g. the lanes L210, L220, L233, L237, L250, L277, L278, and L292 are connected (see Figure 2 and Figure 3).

Nar data mottages pa dataporten 599 lagras det temporart i den andra minnesdelen 540. Nar mottaget indata temporart har lagrats, är databehandlingsenheten 510 iordningstalld att utfora exekvering av kod pa ett vis som beskrivits ovan. Enligt ett utforande innefattar signaler mottagna pa dataporten 599 information am 29 Delar av metoderna beskrivna hari kan utforas av anordningen 500 med hjalp av databehandlingsenheten 510 som Icor programmet lagrat i minnet 560 eller lasiskriyminnet 550. Nar anordningen 500 Icor programmet, exekveras hari beskrivna forfaranden. When data is received on the data port 599, it is temporarily stored in the second memory part 540. Once the received input data has been temporarily stored, the data processing unit 510 is ready to perform code execution in a manner described above. According to one embodiment, signals received at the data port 599 include information on 29 Parts of the methods described herein may be performed by the device 500 using the data processing unit 510 which the Icor program stored in the memory 560 or the laser memory 550. When the device 500 Icor program, the methods described are executed.

Den fOregaende beskrivningen av de fOredragna utfOringsformerna av fOreliggande uppfinning har tillhandahallits i syftet att illustrera och beskriva uppfinningen. Det är inte avsett att vara uttbmmande eller begransa uppfinningen till de beskrivna varianterna. Uppenbarligen kommer manga modifieringar och variationer att framga for fackmannen. Utforingsformerna valdes och beskrevs for att bast forklara principerna av uppfinningen och dess praktiska tillampningar, och darmed mOjliggOra for fackman att forsta uppfinningen for olika utforingsformer och med de olika modifieringarna som ar lampliga for det avsedda bruket. The foregoing description of the preferred embodiments of the present invention has been provided for the purpose of illustrating and describing the invention. It is not intended to be exhaustive or to limit the invention to the variations described. Obviously, many modifications and variations will occur to those skilled in the art. The embodiments were selected and described in order to best explain the principles of the invention and its practical applications, thereby enabling those skilled in the art to understand the invention for various embodiments and with the various modifications which are appropriate to the intended use.

Claims (18)

PATENTKRAVPATENT REQUIREMENTS 1. Forfarande for prestandakontroll av en DOC-enhet (260) has ett avgasreningssystem innefattande en forsta NO,-sensor (237) uppstroms namnda DOC-enhet (260) och en SCR-katalysator (270) nedstroms namnda DOC-enhet (260), kannetecknat av stegen att: - i huvudsak tomma (s410) namnda SCR-katalysator (270) pa reduktionsmedel; - faststalla (s420) en forsta NO2-halt (NO2mod) has avgaserna pa basis av en faststalld NOx-halt (NO,(1) uppstroms namnda DOC-enhet (260) och en faststalld omvandlingsgrad (X) rorande omvandling till NO2 has avgasreningssystemet uppstroms namnda SCR-katalysator (270); - faststalla (s430) en andra NO2-halt (NO2measured) has avgaserna pa basis av en medelst en korskanslig NH3-sensor (278) faststalld NH3-halt (NH3measured) och en korskanslighetsfunktion (F) rorande NO2 for namnda NH3-sensor (278); och - bedama prestanda (s440) has namnda DOC-enhet (260) pa basis av namnda faststallda forsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured).A method for performance checking a DOC unit (260) has an exhaust gas purification system comprising a first NO 2 sensor (237) upstream of said DOC unit (260) and an SCR catalyst (270) downstream of said DOC unit (260) , characterized by the steps of: - substantially empty (s410) said SCR catalyst (270) on reducing agent; - determining (s420) a first NO2 content (NO2mod) has the exhaust gases on the basis of a fixed NOx content (NO, (1) upstream of said DOC unit (260) and a fixed conversion rate (X) concerning conversion to NO2 has the exhaust gas purification system upstream of said SCR catalyst (270); - determining (s430) a second NO2 content (NO2measured) has the exhaust gases on the basis of a NH3 content (NH3measured) determined by means of a cross-sensitive NH3 sensor (278) and a cross-probability function (F) and - assessing performance (s440) has said DOC unit (260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured). 2. FOrfarande enligt krav 1, innefattande steget att: - faststalla (s420) namnda omvandlingsgrad (X) has avgasreningssystemet uppstroms namnda SCR-katalysator (270) genom berakning inbegripande parametrarna avgastemperatur (Tlmeas; Ti cal), avgasmassflode (MF) och termisk trOghet has namnda avgasreningssystem.The method of claim 1, comprising the step of: - determining (s420) said degree of conversion (X) having the exhaust gas purification system upstream of said SCR catalyst (270) by calculating the parameters exhaust temperature (Tlmeas; Ti cal), exhaust mass flow (MF) and thermal inertia. has the said exhaust gas purification system. 3. Forfarande enligt krav 1 eller 2, innefattande steget att: - faststalla (s430) namnda korskanslighetsfunktion (F) rorande NO2 for namnda NH3- sensor (278) baserat pa en aktuell driftpunktangivelse avseende en motor (231) alstrande namnda avgaser, avgassammansattning och avgastemperatur. 31A method according to claim 1 or 2, comprising the step of: - determining (s430) said cross-probability function (F) concerning NO2 for said NH3 sensor (278) based on a current operating point indication regarding an engine (231) generating said exhaust gases, exhaust gas composition and exhaust temperature. 31 4. Forfarande enligt nagot av foregaende krav, innefattande stegen att: - faststalla (s410) att avsedd tomning av reduktionsmedel hos namnda SCRkatalysator (270) uppnatts genom att mata namnda forsta NO,-halt (N0,1) uppstroms namnda DOC-enhet (260) och att mata en andra NO,-halt (NO2) 5 nedstroms namnda SCR-katalysator (270); och - taga (s410) i huvudsak overensstammande varden has de bada NO,-halterna som kriterium pa att avsedd tomning uppnatts.A process according to any one of the preceding claims, comprising the steps of: - determining (s410) that the intended emptying of reducing agent of said SCR catalyst (270) has been achieved by feeding said first NO, - content (N0,1) upstream of said DOC unit ( 260) and feeding a second NO 1 content (NO 2) downstream of said SCR catalyst (270); and - take (s410) the substantially corresponding value has the two NO, levels as a criterion that the intended emptying has been achieved. 5. Forfarande enligt nagot av foregaende krav, innefattande stegen att: - faststalla (s410) att avsedd tOmning av reduktionsmedel has namnda SCR- katalysator (270) uppnatts genom att modellera/berakna namnda forsta NOx-halt (N0,1) uppstrams namnda DOC-enhet (260) och att mata en andra NO,-halt (NO2) nedstroms namnda SCR-katalysator (270); och - taga (s410) i huvudsak Overensstammande varden has de bada NO,-halterna som kriterium pa att avsedd tomning uppnatts.A method according to any one of the preceding claims, comprising the steps of: - determining (s410) that the intended emptying of reducing agent has achieved the said SCR catalyst (270) by modeling / calculating said first NOx content (N0.1) of said DOC. unit (260) and feeding a second NO 1 content (NO 2) downstream of said SCR catalyst (270); and - take (s410) essentially The corresponding value has the two NO, levels as a criterion that the intended emptying has been achieved. 6. Forfarande enligt nagot av foregaende krav, innefattande steget att: - bedoma prestanda (s440) has namnda DOC-enhet (s260) pa basis av namnda faststallda forsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured), varvid en kvot mellan namnda forsta NO2-halt (NO2mod) och namnda andra NO2-halt (NO2measured) skall ligga utanfor ett forutbestamt intervall (I) for att indikera att bristande prestanda has namnda DOC-enhet (260) foreligger.A method according to any one of the preceding claims, comprising the step of: - judging the performance (s440) of said DOC unit (s260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured), wherein a ratio between said first NO2 content (NO2mod) and said second NO2 content (NO2measured) shall be outside a predetermined interval (I) to indicate that poor performance has said DOC unit (260). 7. Forfarande enligt nagot av foregaende krav, innefattande steget att: - bedoma (s440) prestanda has namnda DOC-enhet (260) pa basis av namnda faststallda forsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured), varvid en absolut skillnad (INO2mod— NO2measuredl) mellan namnda forsta NO2-halt (NO2mod) och namnda andra NO2-halt (NO2measured) overstigande 32 ett forutbestamt troskelvarde (TH1) indikerar bristande prestanda hos namnda DOCenhet (260).A method according to any one of the preceding claims, comprising the step of: - judging (s440) the performance of said DOC unit (260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured), wherein an absolute difference (INO2mod— NO2measuredl) between said first NO2 content (NO2mod) and said second NO2 content (NO2measured) exceeding 32 a predetermined threshold value (TH1) indicates poor performance of said DOC unit (260). 8. System for prestandakontroll av en DOC-enhet (260) hos ett avgasreningssystem 5 innefattande en forsta NOR-sensor (237) anordnad uppstroms namnda DOC-enhet (260) och en SCR-katalysator (270) anordnad nedstroms namnda DOC-enhet (260), kannetecknat av: - organ (200; 210; 500; 250) anpassade att i huvudsak tomma namnda SCRkatalysator (270) pa reduktionsmedel; - organ (200; 210; 500) anpassade att faststalla en forsta NO2-halt (NO2mod) hos avgaserna pa basis av en faststalld NO,-halt (N0,1) uppstroms namnda DOC-enhet (260) och en faststalld omvandlingsgrad (X) rorande omvandling till NO2 hos avgasreningssystemet uppstroms namnda SCR-katalysator (270); - organ (200; 210; 500) anpassade att faststalla en andra NO2-halt (NO2measured) hos avgaserna pa basis av en medelst en korskanslig NH3-sensor (278) faststalld NH3-halt (NH3measured) och en korskanslighetsfunktion (F) rorande NO2 for namnda NH3-sensor (278); och - organ (200; 210; 500) anpassade att bedoma prestanda hos namnda DOC-enhet (260) pa basis av namnda faststallda fOrsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured).A system for controlling the performance of a DOC unit (260) of an exhaust gas purification system 5 comprising a first NOR sensor (237) arranged upstream of said DOC unit (260) and an SCR catalyst (270) arranged downstream of said DOC unit ( 260), characterized by: - means (200; 210; 500; 250) adapted to substantially empty said SCR catalyst (270) on reducing agent; means (200; 210; 500) adapted to determine a first NO2 content (NO2mod) of the exhaust gases on the basis of a fixed NO, content (NO0.1) upstream of said DOC unit (260) and a fixed degree of conversion (X ) stirring conversion to NO2 of the exhaust gas purification system upstream of said SCR catalyst (270); means (200; 210; 500) adapted to determine a second NO2 content (NO2measured) of the exhaust gases on the basis of a NH3 content (NH3measured) determined by means of a crucible NH3 sensor (278) and a crucifixion function (F) concerning NO2 for said NH3 sensor (278); and - means (200; 210; 500) adapted to judge the performance of said DOC unit (260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured). 9. System enligt krav 8, innefattande: - organ (200; 210; 500) anpassade att faststalla namnda omvandlingsgrad (X) hos avgasreningssystemet uppstroms namnda SCR-katalysator (270) genom berakning 25 inbegripande parametrarna avgastemperatur (Tlmeas; Ti cal), avgasmassflOde (MF) och termisk troghet hos namnda avgasreningssystem.A system according to claim 8, comprising: - means (200; 210; 500) adapted to determine said degree of conversion (X) of the exhaust gas purification system upstream of said SCR catalyst (270) by calculating including the parameters exhaust temperature (Tlmeas; Ti cal), exhaust mass flow (MF) and thermal inertia of said exhaust gas purification system. 10. System enligt krav 8 eller 9, innefattande: - organ (200; 210; 500) anpassade att faststalla namnda korskanslighetsfunktion (F) rorande NO2 for namnda NH3-sensor (278) baserat pa en aktuell driftpunktangivelse 33 avseende en motor (231) alstrande namnda avgaser, avgassammansattning och avgastemperatur.A system according to claim 8 or 9, comprising: - means (200; 210; 500) adapted to determine said cross-probability function (F) concerning NO2 for said NH3 sensor (278) based on a current operating point indication 33 regarding an engine (231) generating said exhaust gases, exhaust gas composition and exhaust gas temperature. 11. System enligt nagot av krav 8-10, innefattande: - organ (200; 210; 500; 237, 277) anpassade att faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator (270) uppnatts genom att mata namnda forsta NO.-halt (N0.1) uppstroms namnda DOC-enhet (260) och att mata en andra NO.-halt (NO2) nedstroms namnda SCR-katalysator (270); och - organ (200; 210; 500) anpassade att taga i huvudsak overensstammande varden hos de bada NO,-halterna som kriterium pa att avsedd tomning uppnatts.A system according to any one of claims 8-10, comprising: - means (200; 210; 500; 237, 277) adapted to determine that the intended emptying of reducing agent of said SCR catalyst (270) has been achieved by feeding said first NO. content (NO.1) upstream of said DOC unit (260) and feeding a second NO content (NO2) downstream of said SCR catalyst (270); and - means (200; 210; 500) adapted to take substantially the corresponding value of the two NO 1 levels as a criterion for achieving the intended emptying. 12. System enligt nagot av krav 8-11, innefattande: - organ (200; 210; 500) anpassade att faststalla att avsedd tomning av reduktionsmedel hos namnda SCR-katalysator (270) uppnatts genom att modellera/berakna namnda forsta NO.-halt (N0,1) uppstroms namnda DOC-enhet (260); - organ (277) anpassade att mata en andra NO.-halt (NO2) nedstroms namnda SCR-katalysator (270); och - organ (200; 210; 500) anpassade att taga i huvudsak overensstammande varden hos de bada NO.-halterna som kriterium pa att avsedd tomning uppnatts.A system according to any one of claims 8-11, comprising: - means (200; 210; 500) adapted to determine that the intended emptying of reducing agent of said SCR catalyst (270) has been achieved by modeling / calculating said first NO content. (N0.1) upstream of said DOC unit (260); means (277) adapted to feed a second NO 1 content (NO 2) downstream of said SCR catalyst (270); and - means (200; 210; 500) adapted to take the substantially consistent value of the two NO levels as a criterion for achieving the intended emptying. 13. System enligt nagot av krav 8-12, innefattande: - organ (200; 210; 500) anpassade att bedoma prestanda hos namnda DOC-enhet (260) pa basis av namnda faststallda forsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured), varvid en kvot mellan namnda forsta NO2-halt (NO2mod) och namnda andra NO2-halt (NO2measured) skall ligga utanfor 34 ett forutbestamt intervall (I) for att indikera att bristande prestanda hos namnda DOCenhet (260) foreligger.A system according to any one of claims 8 to 12, comprising: - means (200; 210; 500) adapted to assess the performance of said DOC unit (260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured), wherein a ratio between said first NO2 content (NO2mod) and said second NO2 content (NO2measured) shall be outside 34 a predetermined interval (I) to indicate that poor performance of said DOC unit (260) available. 14. System enligt nagot av krav 8-13, innefattande: - organ (200; 210; 500) anpassade att bedoma prestanda hos namnda DOC-enhet (260) pa basis av namnda faststallda forsta NO2-halt (NO2mod) och namnda faststallda andra NO2-halt (NO2measured), varvid en absolut skillnad (NO2mod—NO2measured) mellan namnda forsta NO2-halt (NO2mod) och namnda andra NO2-halt (NO2measured) overstigande ett forutbestamt troskelvarde (TH1) indikerar bristande prestanda hos namnda DOC-enhet (260).A system according to any of claims 8-13, comprising: - means (200; 210; 500) adapted to assess the performance of said DOC unit (260) on the basis of said determined first NO2 content (NO2mod) and said determined second NO2 content (NO2measured), whereby an absolute difference (NO2mod — NO2measured) between said first NO2 content (NO2mod) and said second NO2 content (NO2measured) exceeding a predetermined threshold value (TH1) indicates poor performance of said DOC unit ( 260). 15. Motorfordon (100; 110) innefattande ett system enligt nagot av kraven 8-14.Motor vehicle (100; 110) comprising a system according to any of claims 8-14. 16. Motorfordon (100; 110) enligt krav 15, varvid motorfordonet är nagot av en lastbil, buss, personbil, vattenfarkost och bandvagn.A motor vehicle (100; 110) according to claim 15, wherein the motor vehicle is any of a truck, bus, passenger car, watercraft and tracked vehicle. 17. Datorprogram (P) vid ett avgasreningssystem, dar namnda datorprogram (P) innefattar programkod for att orsaka en elektronisk styrenhet (200; 500) eller en dator (210; 500) ansluten till den elektroniska styrenheten (200; 500) att utfora stegen enligt nagot av patentkraven 1-7.A computer program (P) in an exhaust gas purification system, wherein said computer program (P) comprises program code for causing an electronic control unit (200; 500) or a computer (210; 500) connected to the electronic control unit (200; 500) to perform the steps according to any one of claims 1-7. 18. Datorprogramprodukt innefattande en programkod lagrad pa ett, av en dator lasbart, medium f6r att utf6ra f6rfarandestegen enligt nagot av patentkraven 1-7, nar namnda programkod kOrs pa en elektronisk styrenhet (200; 500) eller en dator (210; 500) ansluten till den elektroniska styrenheten (200; 500). 1/4 or 100 112A computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-7, when said program code is run on an electronic control unit (200; 500) or a computer (210; 500) connected to the electronic control unit (200; 500). 1/4 or 100 112
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