SE537121C2 - Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine - Google Patents

Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine Download PDF

Info

Publication number
SE537121C2
SE537121C2 SE1350621A SE1350621A SE537121C2 SE 537121 C2 SE537121 C2 SE 537121C2 SE 1350621 A SE1350621 A SE 1350621A SE 1350621 A SE1350621 A SE 1350621A SE 537121 C2 SE537121 C2 SE 537121C2
Authority
SE
Sweden
Prior art keywords
sensor
content
component
ref
nox
Prior art date
Application number
SE1350621A
Other languages
Swedish (sv)
Other versions
SE1350621A1 (en
Inventor
Fredrik Mörner
Magnus Wadstrand
Original Assignee
Scania Cv Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1350621A priority Critical patent/SE537121C2/en
Priority to DE112014002182.2T priority patent/DE112014002182T5/en
Priority to PCT/SE2014/050598 priority patent/WO2014189441A1/en
Publication of SE1350621A1 publication Critical patent/SE1350621A1/en
Publication of SE537121C2 publication Critical patent/SE537121C2/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0006—Calibrating gas analysers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • 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
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1493—Details
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
    • G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
    • G01M15/104—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using oxygen or lambda-sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/4175—Calibrating or checking the analyser
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • G01N35/00584—Control arrangements for automatic analysers
    • G01N35/00594—Quality control, including calibration or testing of components of the analyser
    • G01N35/00693—Calibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/30—Controlling by gas-analysis apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—Specially adapted to detect a particular component
    • G01N33/0037—Specially adapted to detect a particular component for NOx
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

537 121 SAM MANDRAG Uppfinningen hanfor sig till ett forfarande for att avgara funktion has en sensor (235; 245; 255; 265) anordnad att faststalla halt av en komponent hos avgaser fr5n en motor (206), innefattande stegen att: exponera (s420; s450) namnda sensor (235; 245; 255; 265) for en referensgas, annan an namnda avgaser, med en kand halt (Ref 1 NOx; Ref 1 Ox) av namnda komponent; faststalla (s430; s460) en halt (HmeasNox; Hmeas0x) av namnda komponent hos namnda referensgas medelst namnda sensor (235; 245; 255; 265); jamfora (s440; s470) den sAlunda faststallda halten (HmeasNox; Hmeas0x) med namnda kanda halt (Ref 1 NOx; Ref 1 Ox) avseende namnda komponent; och bedoma namnda funktion p5 basis av resultatet av namnda jamforelse. Uppfinningen avser ocks5 en datorprogramprodukt innefattande programkod (P) for en dator (200; 210) for att implementera ett forfarande enligt uppfinningen. Uppfinningen avser ocksa en anordning for att avgora funktion hos en sensor (235; 245; 255; 265) anordnad att faststalla halt av en komponent hos avgaser fr5n en motor (206) och ett motorfordon (100) som är utrustat med anordningen. SUMMARY The invention relates to a method for emitting function having a sensor (235; 245; 255; 265) arranged to determine the content of a component of exhaust gases from an engine (206), comprising the steps of: exposing (s420; s450) said sensor (235; 245; 255; 265) for a reference gas, other than said exhaust gas, having a candle content (Ref 1 NOx; Ref 1 Ox) of said component; determining (s430; s460) a content (HmeasNox; HmeasOx) of said component of said reference gas by means of said sensor (235; 245; 255; 265); compares (s440; s470) the thus determined content (HmeasNox; Hmeas0x) with said kanda content (Ref 1 NOx; Ref 1 Ox) with respect to said component; and judging said function on the basis of the result of said comparison. 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 device for determining the function of a sensor (235; 245; 255; 265) arranged to determine the content of a component of exhaust gases from an engine (206) and a motor vehicle (100) equipped with the device.

Description

537 121 Anordning och forfarande for att avgora funktion hos en sensor f6r faststallande av halt av en komponent hos avgaser fran en motor TEKNISKT OMRADE Foreliggande uppfinning avser ett forfarande for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser Iran en motor. Uppfinningen avser ocks5 en datorprogramprodukt innefattande programkod for en dator for att implementera ett forfarande enligt uppfinningen. Uppfinningen avser ocks5 en anordning for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor samt ett motorfordon som är utrustat med anordningen. 15 BAKGRUND Det finns idag strikta bestammelser i m5nga !ander vad galler utslapp av oonskade gaser och partiklar fr5n fordon. Fordonstillverkare arbetar standigt med att forbattra efterbehandlingssystem for att Ora det mojligt att ytterligare minska mangden oonskade emissioner i avgaser. Oonskade gaser som bildas i fordons motorer, for vilka restriktioner finns, är kvaveoxider (NOx). TECHNICAL FIELD The present invention relates to a method for determining the function of a sensor arranged to determine the content of a component of exhaust gases in an engine. . 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 device for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine and a motor vehicle which is equipped with the device. 15 BACKGROUND Today, there are strict regulations in many areas regarding emissions of unwanted gases and particles from vehicles. Vehicle manufacturers are constantly working to improve after-treatment systems to make it possible to further reduce the amount of unwanted emissions in exhaust gases. Unwanted gases formed in vehicle engines, for which there are restrictions, are nitrogen oxides (NOx).

Ett satt att minska mangden NOx i avgaser är att anvanda ett s5 kallat efterbehandlingssystem, exempelvis ett SCR-system (Selective Catalytic Reduction). Detta system innefattar en SCR-katalysator och en doseringsenhet for en lamplig reduktant, t.ex. en ureabaserad vattenlosning. I katalysatorn kan namnda reduktant och NOx-gas reagera och omvandlas till kvavgas och vatten. One way to reduce the amount of NOx in exhaust gases is to use a so-called after-treatment system, for example a SCR system (Selective Catalytic Reduction). This system comprises an SCR catalyst and a dosage unit for a lamp reductant, e.g. a urea-based aqueous solution. In the catalyst, said reductant and NOx gas can react and be converted to nitrogen gas and water.

Mangden NOx i avgaser detekteras med atminstone en NOx-sensor som placeras i en avgaskanal hos avgassystemet, till exempel nedstroms SCR-katalysatorn. Sensorn anvands for att detektera mangden NOx i avgaser som slapps ut fran fordonet. 1 537 121 Signalerna frAn NOx-sensorn kan anvandas for att exempelvis styra doseringen av namnda reduktant som anvands i SCR-systemet eller som underlag for att generera felkoder clA mangden NOx är hogre an ett visst forutbestamt varde. The amount of NOx in exhaust gases is detected with at least one NOx sensor which is placed in an exhaust duct of the exhaust system, for example downstream of the SCR catalyst. The sensor is used to detect the amount of NOx in exhaust gases emitted from the vehicle. The signals from the NOx sensor can be used to control, for example, the dosage of said reductant used in the SCR system or as a basis for generating error codes when the amount of NOx is higher than a certain predetermined value.

DA mangden detekterad NOx i avgaserna är hogre an ett visst forutbestamt varde uppmanas foraren att kora fordonet till en verkstad for att Atgarda problemet. En detekterad hog NOx-halt kan ha en mangd olika orsaker sAsom kvalitet hos namnda reduktant, ett defekt SCR-system, defekta sensorer etc. I verkstaden utfors Stgarder for att utreda samt korrigera orsaken till de hoga detekterade NOx-halterna i avgaserna. En vanlig Stgard som utfors cla en for hog NOx-halt har detekterats, är att kontrollera funktionen hos NOx-sensorn. Detta gars genom att kora motorn enligt ett visst forutbestamt program och medelst NOx-sensorn detektera mangden NOx i avgaserna under namnda program. De detekterade halterna av NOx i avgaserna janitors med beraknade NOx-halter. De beraknade NOx-halterna erhAllas ur en berakningsmodell clar olika faktorer som pAverkar NOx-halten i avgaserna sAsom mangd insprutat bransle, motorns drifttillstand etc. tas i beaktande. Om de uppmatta NOx-halterna skiljer sig frAn de beraknade NOx-halterna med mer an ett visst forutbestamt varde konstateras att NOx-sensorn är defekt och NOx-sensorn byts ut. Since the amount of NOx detected in the exhaust gases is higher than a certain predetermined value, the driver is asked to drive the vehicle to a workshop to Atgarda the problem. A detected high NOx content can have a variety of reasons such as the quality of the said reductant, a defective SCR system, defective sensors, etc. In the workshop, Stgarder is carried out to investigate and correct the cause of the high detected NOx levels in the exhaust gases. A common Stgard that performs cla a for hog NOx content has been detected, is to check the function of the NOx sensor. This is done by running the engine according to a certain predetermined program and by means of the NOx sensor detecting the amount of NOx in the exhaust gases during said program. The detected levels of NOx in the exhaust gases are janitors with calculated NOx levels. The calculated NOx levels are obtained from a calculation model for various factors that affect the NOx content in the exhaust gases, such as the amount of fuel injected, the engine's operating condition, etc. are taken into account. If the measured NOx levels differ from the calculated NOx levels by more than a certain predetermined value, it is determined that the NOx sensor is defective and the NOx sensor is replaced.

Da det är komplicerat att genom berakning fa fram tillforlitliga NOx-halter kan, efter en jamforelse mellan beraknad NOx-halt och detekterad NOx-halt, en NOx-sensor ibland felaktigt pekas ut som defekt och darmed bytas ut i onoclan. As it is complicated to obtain reliable NOx levels by calculation, after a comparison between calculated NOx content and detected NOx content, a NOx sensor can sometimes be incorrectly pointed out as defective and thus replaced in onoclan.

Att driva en motor hos ett fordon vid optimal forbranning är onskvart clA mangden oonskade emissioner samt bransleforbrukning harvid kan minimeras. En val avvagd mangd bransle i forhAllande till luft i motorn motsvarar en vasentligen optimal forbranning i motorn. F6r att fã en uppskattning av hur optimal motorns forbranning är, kan syrehalten i en avgaskanal frAn namnda motor detekteras. Detta kan utforas medelst en sA kallad Lambda-sensor. Med hjalp av den detekterade 2 537 121 mangden syre i avgaskanalen kan mangden bransle i forhallande till luft i avgaskanalen beraknas. Mangden bransle i forhallande till luft i avgaskanalen kan vara ett matt p5 hur optimal motorns forbranning 5r. Beroende p5 vilken halt syre som detekterats i avgaskanalen kan bransleinsprutningen i motorn regleras 55 att en optimal forbranning erhalles och darmed skapas en mindre mangd emissioner. Operating an engine of a vehicle during optimal combustion is unequal to the amount of unwanted emissions and fuel consumption can be minimized. A choice balanced amount of fuel in relation to air in the engine corresponds to a substantially optimal combustion in the engine. In order to obtain an estimate of how optimal the combustion of the engine is, the oxygen content in an exhaust duct from said engine can be detected. This can be done by means of a so-called Lambda sensor. With the aid of the detected 2,537,121 the amount of oxygen in the exhaust duct, the amount of fuel in relation to air in the exhaust duct can be calculated. The amount of fuel in relation to air in the exhaust duct can be a dull p5 how optimal the engine's combustion 5r. Depending on the content of oxygen detected in the exhaust duct, the fuel injection in the engine can be regulated so that an optimal combustion is obtained and thus a smaller amount of emissions is created.

DS en detekterad syrehalt i avgaserna avviker fran ett forutbestamt intervall inom vilket syrehalten anses vara normal kan lamplig felkod genereras. Alternativt kan foraren uppmanas att kora fordonet till en verkstad eller servicestation for att atgarda problemet. En detekterad syrehalt som Over- eller understiger namnda normala syrehalt kan ha en mangd olika orsaker sasom exempelvis felaktig mangd doserat bransle, defekt Lambda-sensor etc. I verkstaden utfors Atgarder for att utreda samt korrigera orsaken till den detekterade syrehalten som under- eller overstiger namnda normala syrehalt. En vanlig Stgard är att kontrollera funktionen hos Lambda-sensorn. Detta gars vanligtvis genom att kora motorn enligt ett visst 15 fOrutbestamt program och medelst Lambda-sensorn detektera syrehalten i avgaskanalen. Den detekterade syrehalten kan anvandas for att bet-Una mangden bransle i forhallande till luft i avgaserna under namnda program. De, med hjalp av de uppmatta syrehalterna, beraknade halterna bransle i forhallande till luft i avgaserna, vilket i denna beskrivning kommer att benamnas de detekterade halterna bransle i forhallande till luft i avgaserna, jamfors med ett beraknat varde p5 mangden bransle i forhallande till luft dar faktorer s5som mangd doserat bransle, motorns driftstillst5nd etc. tas i beaktande. Om den med hjalp av Lambda-sensorn detekterade mangden bransle i forhallande till luft skiljer sig fran den beraknade mangden bransle i forh5llande till luft med mer an ett visst bestamt varde konstateras att Lambda-sensorn är defekt och Lambda-sensorn byts ut. DS a detected oxygen content in the exhaust gases deviates from a predetermined range within which the oxygen content is considered to be normal, a suitable error code can be generated. Alternatively, the driver may be asked to drive the vehicle to a workshop or service station to address the problem. A detected oxygen content that exceeds or falls below the normal oxygen content can have a variety of causes such as incorrect amount of dosed fuel, defective Lambda sensor, etc. In the workshop, Atgarder is performed to investigate and correct the cause of the detected oxygen content that exceeds or exceeds said normal oxygen content. A common Stgard is to check the function of the Lambda sensor. This is usually done by running the engine according to a certain predetermined program and by means of the Lambda sensor detecting the oxygen content in the exhaust duct. The detected oxygen content can be used to control the amount of fuel in relation to air in the exhaust gases during said program. They, with the aid of the measured oxygen contents, calculated the levels of industry in relation to air in the exhaust gases, which in this description will be called the detected levels of industry in relation to air in the exhaust gases, compared with an estimated value of the amount of industry in relation to air there Factors such as the amount of dosed fuel, the operating condition of the engine, etc. are taken into account. If the amount of industry in relation to air detected with the aid of the Lambda sensor differs from the calculated amount of industry in relation to air by more than a certain specific value, it is found that the Lambda sensor is defective and the Lambda sensor is replaced.

DS det är komplicerat att genom berakning erh51Ia en tillforlitlig mangd bransle i forhallande till luft kan, efter en jamforelse mellan beraknad mangd bransle i forh5llande till luft och detekterad mangd bransle i forhallande till luft, en Lambda- sensor ibland felaktigt pekas ut som defekt och darmed bytas ut i onoclan. 3 537 121 SAMMANFATTN1NG AV UPPF1NNINGEN Ett syfte med foreliggande uppfinning är att tillhandah511a ett nytt och fordelaktigt forfarande far att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor. DS it is complicated that by calculating obtain a reliable amount of industry in relation to air can, after a comparison between calculated amount of industry in relation to air and detected amount of industry in relation to air, a Lambda sensor is sometimes incorrectly pointed out as defective and thus replaced in onoclan. SUMMARY OF THE INVENTION An object of the present invention is to provide a new and advantageous method for discharging the function of a sensor arranged to determine the content of a component of exhaust gases from an engine.

Ett annat syfte med uppfinningen är att tillhandahalla en fly och fordelaktig anordning och ett nytt och fordelaktigt datorprogram for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor. Another object of the invention is to provide an escape and advantageous device and a new and advantageous computer program for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine.

Ytterligare ett syfte med uppfinningen är att tillhandah51Ia ett forfarande, en anordning och ett datorprogram for att astadkomma ett tillforlitligt och anvandarvanligt avgarande av funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor. A further object of the invention is to provide a method, an apparatus and a computer program for providing a reliable and user-friendly assessment of the function of a sensor arranged to determine the content of a component of exhaust gases from an engine.

Ytterligare ett syfte med uppfinningen är att tillhandahalla ett forfarande, en anordning och ett datorprogram for att 5stadkomma ett tidseffektivt avgarande av funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor. A further object of the invention is to provide a method, an apparatus and a computer program for providing a time-efficient delivery of function of a sensor arranged to determine the content of a component of exhaust gases from an engine.

Ytterligare ett syfte med uppfinningen är att tillhandahalla ett forfarande, en anordning och ett datorprogram for att reducera risk for att en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor felaktigt identifieras som defekt eller byts ut i onodan. A further object of the invention is to provide a method, a device and a computer program for reducing the risk that a sensor arranged to determine the content of a component of exhaust gases from an engine is incorrectly identified as defective or replaced in the onodan.

Vissa av dessa syften uppn5s med ett farfarande for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor enligt patentkrav 1. Vissa av dessa syften uppn5s med en anordning enligt krav 8. Fordelaktiga utforingsformer anges med hanvisning till de beroende kraven. 10 15 20 4 537 121 Enligt en aspekt av foreliggande uppfinning tillhandahAlls ett forfarande for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor, inbegripande stegen att: exponera namnda sensor for en referensgas, annan an namnda avgaser, med en kand halt av namnda komponent; faststalla en halt av namnda komponent hos namnda referensgas medelst namnda sensor; - jamfora den salunda faststallda halten med namnda kanda halt avseende namnda komponent; och - bedoma namnda funktion pa basis av resultatet av namnda jamforelse. Some of these objects are achieved with a method for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine according to claim 1. Some of these objects are achieved with a device according to claim 8. Advantageous embodiments are stated with reference to the depending on the requirements. According to one aspect of the present invention, there is provided a method of determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine, including the steps of: exposing said sensor to a reference gas, other than said exhaust gases. , with a candle content of said component; determining a content of said component of said reference gas by means of said sensor; - comparing the thus determined content with said kanda content with respect to said component; and - assessing said function on the basis of the result of said comparison.

Genom att jamfora den medelst sensorn faststallda halten av en komponent i namnda referensgas med den kanda halten av nannnda komponent i namnda referensgas kan det p5 ett robust, noggrant och tidseffektivt satt avgoras huruvida namnda sensor är defekt eller inte. By comparing the content of a component in said reference gas determined by the sensor with the known content of said component in said reference gas, it can be determined in a robust, accurate and time-efficient manner whether said sensor is defective or not.

Namnda referensgas har fordelaktigt en noggrant uppmatt halt av namnda komponent. Denna halt kan vara uppmatt med en valfri lamplig sensor till exempel vid ett tillverkningsstalle dar namnda referensgas bereds. D5 den kanda halten av 20 namnda komponent hos namnda referensgas Jr bestamd med mycket hag noggrannhet, kan funktionen hos sensorn avgoras med mycket hog tillforlitlighet for de fall d5 for hoga eller for I5ga halter av namnda komponent hos en avgaskanal detekterats. Detta medlar stora fordelar d5 det akar chanserna till att den verkliga orsaken till de detekterade for hoga eller for laga halterna av namnda komponent kan identifieras och cla orsaken till de detekterade halterna undersoks kommer enligt det uppfinningsmassiga forfarandet en sensor som Jr korrekt inte bytas ut vilket medlar en kostnadsbesparing. D5 namnda forfarande gar snabbt att genomfora sparas tid som kan anyandas till att ytterligare undersoka orsaken till felet som genererat de detekterade far hoga eller for !Aga halterna av namnda komponent hos namnda avgaskanal. 537 121 Enligt en aspekt av uppfinningen anses namnda sensor vara korrekt om den medelst sensorn faststallda halten ligger inom ett visst forutbestamt intervall, vilket intervall Jr forknippat med namnda kanda halt av namnda komponent i referensgasen. Said reference gas advantageously has an accurately measured content of said component. This content can be measured with an optional lamp sensor, for example at a production plant where the reference gas is prepared. Since the known content of said component of said reference gas is determined with very high accuracy, the function of the sensor can be determined with very high reliability for the cases where too high or too low levels of said component of an exhaust duct have been detected. This offers great advantages as it increases the chances that the real cause of the detected high or low levels of said component can be identified and the cause of the detected levels is investigated according to the inventive method a sensor which is not correctly replaced which means a cost saving. The said procedure can be carried out quickly, saving time which can be used to further investigate the cause of the error which generated the detected hazards or increase the levels of said component of said exhaust duct. According to one aspect of the invention, said sensor is considered to be correct if the content determined by the sensor is within a certain predetermined interval, which interval Jr is associated with said known content of said component in the reference gas.

Enligt ett exempel, dar namnda komponent är NOx, kan namnda kanda halt vara 900 ppm. Namnda intervall kan c15 enligt ett exempel vara mellan 895 och 905 ppm. Namnda intervall kan alternativt vara mellan 870 och 930 ppm. Namnda intervall kan enligt ett exempel definieras som +/- 5% av namnda kanda halt. Namnda intervall kan enligt ett exempel definieras som +/- 10% av namnda kanda halt. According to an example, where said component is NOx, said kanda content may be 900 ppm. Said range, c15 according to an example may be between 895 and 905 ppm. Said range may alternatively be between 870 and 930 ppm. According to an example, said range can be defined as +/- 5% of said kanda content. Said interval can according to an example be defined as +/- 10% of said kanda content.

Enligt en aspekt av uppfinningen exponeras namnda sensor far en referensgas under en tidsperiod mellan 1 och 5 minuter. Enligt en aspekt av uppfinningen exponeras namnda sensor for en referensgas under en lamplig tidsperiod, exempelvis 1, 3, 5, 7 eller 10 minuter. According to one aspect of the invention, said sensor is exposed to a reference gas for a period of time between 1 and 5 minutes. According to one aspect of the invention, said sensor is exposed to a reference gas for an appropriate period of time, for example 1, 3, 5, 7 or 10 minutes.

Enligt en aspekt av uppfinningen Jr nJmnda sensor en NOx-sensor. According to one aspect of the invention, said sensor is a NOx sensor.

Enligt en aspekt av uppfinningen är namnda sensor en Lambda-sensor. According to one aspect of the invention, said sensor is a Lambda sensor.

Harvid tillhandahns ett mangsidigt forfarande dar halter av olika komponenter kan faststallas for att p5 ett tillforlitligt s5tt avgara funktion hos en respektive sensor. This provides a versatile method in which levels of different components can be determined in order to reliably determine the function of a respective sensor.

Forfarandet kan innefatta steget att: efter steget att exponera namnda sensor for en forsta referensgas med en kand halt av namnda komponent, exponera namnda sensor for Atminstone en ytterligare referensgas, dar namnda ytterligare referensgas har en kand halt av namnda komponent som skiljer sig fr5n halten i namnda forsta referensgas. 6 537 121 Enligt en aspekt av uppfinningen kan namnda funktion hos 5tminstone tv5 sensorer aygoras samtidigt genom att under yasentligen samma tidsperiod exponera namnda kminstone ty5 sensorer for referensgaser anpassade for respektive sensor. Genom att samtidigt avgiira funktion hos respektive sensor erhalles ett tidseffektivt forfarande. The method may comprise the step of: after the step of exposing said sensor to a first reference gas having a candle content of said component, exposing said sensor to At least one further reference gas, wherein said additional reference gas has a candle content of said component different from the content of named first reference gas. According to an aspect of the invention, said function of at least two sensors can be increased simultaneously by exposing said at least the same time period to said at least two sensors for reference gases adapted for each sensor. By simultaneously delivering function to each sensor, a time-efficient procedure is obtained.

Enligt en aspekt av uppfinningen är namnda komponent NOx. Enligt en aspekt av uppfinningen är namnda komponent syre. According to one aspect of the invention, said component is NOx. According to one aspect of the invention, said component is oxygen.

D5 funktion hos olika typer ay sensorer kan aygoras enligt det uppfinningsmassiga forfarandet erh5lls ett m5ngsidigt forfarande. The operation of different types of sensors can be enhanced according to the inventive method, a versatile method is obtained.

Forfarandet kan innefatta stegen att: - exponera namnda sensor for en forsta referensgas med en kand halt av namnda 15 komponent; - exponera namnda sensor for atminstone en ytterligare referensgas, clar namnda ytterligare referensgas har en halt av namnda komponent som skiljer sig fran halten i namnda forsta referensgas. The method may comprise the steps of: - exposing said sensor to a first reference gas with a candle content of said component; exposing said sensor to at least one further reference gas, clar said further reference gas has a content of said component which differs from the content of said first reference gas.

Enligt ett utforande är namnda referensgas luft. Ett lampligt antal referensgaser kan anvandas enligt det uppfinningsmassiga forfarandet for att aygora funktion hos namnda sensor. Varje referensgas kan innehalla en noggrant faststalld kand koncentration av namnda komponent. En sadan referensgas kan saledes innefatta en koncentration av namnda komponent som är vasentligen noll. According to one embodiment, said reference gas is air. An appropriate number of reference gases can be used according to the inventive process to enhance the operation of said sensor. Each reference gas may contain a precisely determined concentration of said component. Such a reference gas may thus comprise a concentration of said component which is essentially zero.

Enligt en aspekt ay uppfinningen exponeras namnda sensor for kminstone ty5 referensgaser med inbordes olika kanda halter ay namnda komponent. Exponering av de kminstone ty5 referensgaserna sker foretradesvis yid olika tidpunkter for att sakerhetsstalla att enbart en referensgas at gangen exponeras for namnda sensor. 7 537 121 Enligt ett exempel exponeras namnda sensor for en forsta referensgas uppvisande en kand halt NOx om 0 ppm och en andra referensgas med en kand halt NOx om 900 ppm. Enligt ett utforingsexempel tacks sensorns matregister vasentligen in av namnda kanda halter NOx. Enligt ett utforingsexempel kan tv5 referensgaser anvandas enligt det uppfinningsmassiga forfarandet, vilka tv5 referensgaser inbegriper en kand halt av namnda komponent vid en lagre del respektive hogre del av sensorns matregister. According to one aspect of the invention, said sensor is exposed to at least five reference gases with different known contents of the said component. Exposure of the at least one reference gas takes place preferably at different times in order to ensure that only one reference gas is exposed to the said sensor at a time. 7 537 121 According to one example, said sensor is exposed to a first reference gas having a candle NOx content of 0 ppm and a second reference gas having a candle NOx content of 900 ppm. According to an exemplary embodiment, the sensor's food register is essentially thanked by the said kanda levels NOx. According to an exemplary embodiment, tv5 reference gases can be used according to the inventive method, which tv5 reference gases comprise a candle content of said component at a lower part and a higher part of the sensor food register, respectively.

Enligt ett exempel exponeras namnda sensor for tre referensgaser med inbordes olika kand halt av namnda komponent. Enligt ett utforingsexempel har namnda tre referensgaser 0, 500 respektive 1000 ppm NOx. Enligt ett utforingsexempel tacks sensorns matregister in av namnda kanda halter NOx. According to one example, the said sensor is exposed to three reference gases with different levels of said component on board. According to an exemplary embodiment, the three reference gases have 0, 500 and 1000 ppm NOx, respectively. According to an exemplary embodiment, the sensor's food register is thanked by the said kanda levels NOx.

Enligt ett exempel exponeras namnda sensor for tio referensgaser med inbordes olika kand halt av NOx. Enligt ett utfiiringsexempel har namnda tio referensgaser, exempelvis 0, 100, 200, 300, 400, 500, 600, 700, 800, 900 respektive 1000 ppm NOx. Enligt detta utforingsexempel testas namnda sensors hela matregister. Enligt ett utforingsexempel tacks sensorns matregister in av namnda kanda halter NOx. According to one example, the said sensor is exposed to ten reference gases with inboard different levels of NOx. According to an exemplary embodiment, the name has ten reference gases, for example 0, 100, 200, 300, 400, 500, 600, 700, 800, 900 and 1000 ppm NOx, respectively. According to this embodiment, the entire food register of said sensor is tested. According to an exemplary embodiment, the sensor's food register is thanked by the said kanda levels NOx.

Enligt ett exempel utfors matningar p5 5tminstone en referensgas med en kand halt NOx upp till 3000 ppm. According to one example, feeds p5 5 are carried out at least one reference gas with a candlestick content of NOx up to 3000 ppm.

Enligt en aspekt av namnda uppfinning valjs namnda, inbordes olika, kanda halter av namnda komponent for att harvid tacka in vasentligen hela sensorns matregister. According to one aspect of said invention, said, different, known contents of said component are selected to thereby substantially fill in the entire food register of the sensor.

Enligt en aspekt av foreliggande uppfinningen kan en sensors matregister, for de fall cI5 namnda sensor är en NOx-sensor, vara mellan 0 och 3000 ppm. According to one aspect of the present invention, a food register of a sensor, in cases where said sensor is a NOx sensor, may be between 0 and 3000 ppm.

Enligt ett utforande motsvaras en referensgas med en kand halt av NOx om 0 ppm av luft. Namnda luft kan besta av verkstadsluft, utomhusluft eller kemisk luft. According to one embodiment, a reference gas with a candlestick content of NOx of 0 ppm corresponds to air. Said air may consist of workshop air, outdoor air or chemical air.

Genom att anvanda luft som referensgas kan ett kostnadseffektivt forfarande 8 537 121 erhallas cla denna referensgas inte behover beredas. Namnda komponent i luft behover ej matas av en kontrollsensor cla namnda halt redan Jr kand. By using air as the reference gas, a cost-effective procedure can be obtained cla this clause gas does not need to be prepared. The said component in air does not need to be fed by a control sensor cla the said content already Jr kand.

Enligt det uppfinningsmassiga forfarandet erhalls ett tillforlitligt resultat av avgarandet av funktion hos en sensor. Enligt det uppfinningsmassiga forfarandet kan en avgarandet av funktion hos en sensor utforas tidseffektivt. According to the inventive method, a reliable result is obtained from the performance of a sensor. According to the inventive method, a departure from the function of a sensor can be performed in a time-efficient manner.

Enligt en aspekt av namnda uppfinning kan en sensors matregister, far de fall da namnda sensor Jr en Lambda-sensor, vara mellan 0,8 och 1,7. According to one aspect of said invention, a food register of a sensor, in cases where said sensor Jr a Lambda sensor, may be between 0.8 and 1.7.

Forfarandet kan innefatta steget att: - bibehalla namnda sensor signalansluten till ett styrsystem hos namnda motor pa samma sat som vid sensorns gangse anvandning. The method may comprise the step of: - maintaining said sensor signal connected to a control system of said motor in the same manner as in the normal use of the sensor.

Namnda sensor Jr under normal drift signalansluten till ett styrsystem hos namnda motor. Signaler inbegripande uppgift am detekterad halt av namnda komponent skickas till styrsystemet som Jr anpassat att avgara huruvida namnda halt ska ligga till grund for att generera ett forslag pa en kontroll- eller serviceatgard eller inte. Signaler inbegripande uppgift om detekterad halt av namnda komponent skickas till styrsystemet som är anpassat att avgiira huruvida namnda halt ska ligga till grund for att generera en felkod eller inte. Said sensor Jr during normal operation is signal-connected to a control system of said motor. Signals including information on the detected content of said component are sent to the control system which is adapted to decide whether the said content should form the basis for generating a proposal for a control or service yard or not. Signals including information on detected content of said component are sent to the control system which is adapted to determine whether said content should form the basis for generating an error code or not.

Genom att bibehalla namnda sensor signalansluten till ett styrsystem has namnda motor pa samma satt som vid sensorns gangse anvandning kan ett snabbt och enkelt forfarande enligt uppfinningen astadkommas. Genom att sensorn är ansluten till namnda styrsystem under forfarandet sparas tid cla namnda sensor inte behover kopplas ur och anslutas till ett annat styrsystem eller matutrustning. 9 537 121 Med hjalp av namnda signalanslutning kan namnda styrsystem forbereda sensorn for detektering av namnda komponent hos en referensgas, t ex. genom att vat-ma upp sensorn till en forutbestamd lamplig temperatur. By maintaining said sensor signal-connected to a control system, said motor has the same method as in the normal use of the sensor, a fast and simple method according to the invention can be achieved. Because the sensor is connected to said control system during the procedure, time is saved and said sensor does not need to be disconnected and connected to another control system or feeding equipment. With the aid of said signal connection, said control system can prepare the sensor for detecting said component of a reference gas, e.g. by heating the sensor to a predetermined lamp temperature.

Enligt en aspekt av foreliggande uppfinning utfors namnda exponering av en referensgas med namnda sensor anordnad vid sin gangse plats hos avgaskanalen eller anordnad externt namnda avgaskanal. Enligt ett utforande Jr namnda sensor vid namnda exponering av en referensgas signalansluten till en styrenhet hos fordonet, exempelvis motorns styrsystem. According to an aspect of the present invention, said exposure of a reference gas is performed with said sensor arranged at its usual location by the exhaust duct or arranged externally said exhaust duct. According to an embodiment Jr said sensor at said exposure of a reference gas signal connected to a control unit of the vehicle, for example the engine control system.

Enligt en aspekt av foreliggande uppfinning utfors namnda exponering med namnda sensor anordnad vid sin gangse plats hos avgaskanalen. Enligt denna aspekt fors en referensgas in i namnda avgassystem sa att namnda sensor exponeras av namnda referensgas for att tillSta adekvat detektering av namnda halt av namnda komponent. According to one aspect of the present invention, said exposure is performed with said sensor arranged at its usual location at the exhaust duct. According to this aspect, a reference gas is forced into said exhaust system so that said sensor is exposed by said reference gas to allow adequate detection of said content of said component.

Enligt en aspekt av foreliggande uppfinning utfors namnda exponering med namnda sensor anordnad externt narrinda avgaskanal. Enligt ett utforande Jr namnda sensor signalansluten till motorns styrsystem, saledes utfOrs matningen harvid i narheten av namnda avgaskanal, men externt namnda avgaskanal. According to an aspect of the present invention, said exposure is performed with said sensor arranged externally narrinda exhaust duct. According to one embodiment, said sensor is signal-connected to the engine control system, thus the feeding is carried out in the vicinity of said exhaust duct, but externally named exhaust duct.

Forfarandet kan implementeras i existerande motorfordon. Programkod for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor enligt uppfinningen kan installeras i en styrenhet hos fordonet vid tillverkning av detsamma. En kopare av fordonet kan saledes fa mojlighet att valja forfarandets funktion som ett tillval. Alternativt kan programkod for att utfora det uppfinningsmassiga forfarandet for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor installeras i en styrenhet hos fordonet vid uppgradering vid en servicestation. I detta fall kan programkoden laddas in i ett minne i styrenheten. 10 537 121 Programkod for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor kan uppdateras eller bytas ut. Vidare kan olika delar av programkoden for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor bytas ut oberoende av varandra. Denna modulara konfiguration 5r fordelaktig ur ett underh5lIsperspektiv. The procedure can be implemented in existing motor vehicles. Program code for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine according to the invention can be installed in a control unit of the vehicle in the manufacture thereof. A buyer of the vehicle may thus have the option of choosing the function of the procedure as an option. Alternatively, program code for carrying out the inventive method for discharging function of a sensor arranged to determine the content of a component of exhaust gases from an engine may be installed in a control unit of the vehicle when upgrading at a service station. In this case, the program code can be loaded into a memory in the control unit. 10 537 121 Program code for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine can be updated or replaced. Furthermore, different parts of the program code for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine can be replaced independently of each other. This modular configuration is advantageous from a maintenance perspective.

Enligt en aspekt av foreliggande uppfinning tillhandahalls en anordning far att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor, innefattande: en sensor anordnad hos en avgaskanal anordnad att detektera namnda halt av en komponent hos en referensgas, annan an namnda avgaser, med en kand halt av namnda komponent; organ anpassade att faststalla en halt av namnda komponent hos namnda referensgas medelst namnda sensor; organ anpassade att jamfora den s5lunda faststallda halten med namnda kanda halt avseende namnda komponent; och organ anpassade att beclama namnda funktion pa basis av resultatet av namnda jamforelse. According to one aspect of the present invention, there is provided an apparatus for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine, comprising: a sensor arranged at an exhaust duct arranged to detect said content of a component of a reference gas, another an said exhaust gas, with a candle content of said component; means adapted to determine a content of said component of said reference gas by means of said sensor; means adapted to compare the thus determined content with said kanda content with respect to said component; and means adapted to determine said function on the basis of the result of said comparison.

Enligt en aspekt av foreliggande uppfinning tillhandahalls en anordning far att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor, dar namnda sensor är anpassad for exponering for en referensgas, annan an namnda avgaser, med en kand halt av namnda komponent, och dar namnda sensor vidare är anpassad att faststalla en halt av namnda komponent hos namnda referensgas. Anordningen innefattar vidare: organ anpassade att jamfora den salunda faststallda halten med namnda kanda halt avseende namnda komponent; och organ anpassade att bedoma namnda funktion p5 basis av resultatet av namnda 30 jamforelse. 11 537 121 Anordningen kan innefatta en sensor, varvid namnda sensor är en NOx-sensor eller en Lambda-sensor. According to one aspect of the present invention, there is provided an apparatus for emitting function of a sensor arranged to determine the content of a component of exhaust gases from an engine, said sensor being adapted for exposure to a reference gas, other than said exhaust gases, with a known content of said component, and wherein said sensor is further adapted to determine a content of said component of said reference gas. The device further comprises: means adapted to compare the thus determined content with said kanda content with respect to said component; and means adapted to judge said function on the basis of the result of said comparison. The device may comprise a sensor, said sensor being a NOx sensor or a Lambda sensor.

Anordningen kan innefatta: - organ anpassade att exponera n5mnda sensor far Stminstone tv5 referensgaser med inbardes olika kanda halter av namnda komponent far bedamning av namnda funktion. The device may comprise: - means adapted to expose said sensor for at least two reference gases with different known contents of said component for assessment of said function.

Anordningen kan innefatta: - organ anpassade att lostagbart h5lla namnda sensor, varvid namnda organ är lostagbart fast hos namnda avgaskanal. The device may comprise: - means adapted to releasably hold said sensor, said means being releasably fixed to said exhaust duct.

Anordningen kan innefatta: - organ anpassade att lostagbart halla namnda sensor, varvid namnda organ är lostagbart fast hos namnda avgaskanal. The device may comprise: - means adapted to releasably hold said sensor, said means being releasably fixed to said exhaust duct.

Ovanstaende syften uppnas ocksa med ett motorfordon som innefattar anordningen for att avgora funktion hos en sensor anordnad att faststalla halt ay en komponent hos avgaser fr5n en motor. Motorfordonet kan vara en lastbil, buss eller personbil. The above objects are also achieved with a motor vehicle which comprises the device for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine. The motor vehicle can be a truck, bus or car.

Enligt en aspekt av uppfinningen tillhandah5lls ett datorprogram for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor, dar namnda datorprogram innefattar programkod far att orsaka en elektronisk styrenhet eller en annan dator ansluten till den elektroniska styrenheten att utfora stegen enligt nagot ay patentkraven 1-7. According to one aspect of the invention there is provided a computer program for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine, said computer program comprising program code for causing an electronic control unit or another computer connected to the electronic control unit to perform the steps according to any of claims 1-7.

Enligt en aspekt av uppfinningen tillhandahalls ett datorprogram for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser 12 537 121 fran en motor, dar namnda datorprogram innefattar programkod lagrad p5 ett, av en dator lasbart, medium for att orsaka en elektronisk styrenhet eller en annan dator ansluten till den elektroniska styrenheten att utfora stegen enligt nagot av patentkraven 1-7. According to one aspect of the invention, there is provided a computer program for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine, said computer program comprising program code stored on a computer readable medium for causing a electronic control unit or another computer connected to the electronic control unit to perform the steps according to any one of claims 1-7.

Enligt en aspekt av uppfinningen tillhandahalls en datorprogramprodukt innefattande en programkod lagrad pa ett, av en dator lasbart, medium for att utfora forfarandestegen enligt n5got av patentkraven 1-7, nar namnda programkod {cars pa en elektronisk styrenhet eller en annan dator ansluten till den elektroniska styrenheten. According to one aspect of the invention, there is provided a computer program product comprising a program code stored on a computer readable medium for performing the method steps according to any one of claims 1-7, when said program code {cars on an electronic control unit or another computer connected to the electronic the control unit.

Ytterligare syften, fordelar och nya sardrag hos den foreliggande uppfinningen kommer att framg5 for fackmannen av foljande detaljer, liksom via utovning av uppfinningen. Medan uppfinningen är beskriven nedan, bar det framga att uppfinningen inte Jr begransad till de specifika beskrivna detaljerna. Fackman som har tillgang till !aroma hari kommer att karma igen ytterligare applikationer, modifieringar och inforlivanden inom andra omrAden, vilka är inom omfinget for uppfinningen. 20 OVERSIKTLIG BESKRIVNING AV RITNINGARNA For en mer komplett forst5else av foreliggande uppfinning och ytterligare syften och fordelar darav, gars nu hanvisning till foljande detaljerade beskrivning som ska lasas tillsammans med de 5tfoljande 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 2a schematiskt illustrerar en anordning for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor, dar namnda sensor är anordnad i en avgaskanal som leder avgaser fran en motor, enligt en utforingsform av uppfinningen; 13 537 121 Figur 2b schematiskt illustrerar en utforingsform av foreliggande uppfinning; Figur 2c schematiskt illustrerar en utforingsform av foreliggande uppfinning; Figur 2d schematiskt illustrerar en utforingsform av foreliggande uppfinning; Figur 2e schematiskt illustrerar en utforingsform av foreliggande uppfinning; Figur 2f schematiskt illustrerar en utforingsform av foreliggande uppfinning; Figur 3a schematiskt illustrerar ett diagram, enligt en aspekt av uppfinningen; Figur 3b schematiskt illustrerar ett diagram, enligt en aspekt 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 aspekt av uppfinningen; 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 aroma hari will again appreciate 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 following drawings in which like reference numerals refer to like parts in the various figures, and in which: Figure 1 schematically illustrates a vehicle, according to an embodiment of the invention; Figure 2a schematically illustrates a device for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine, said sensor being arranged in an exhaust duct leading exhaust gases from an engine, according to an embodiment of the invention; Figure 2b schematically illustrates an embodiment of the present invention; Figure 2c schematically illustrates an embodiment of the present invention; Figure 2d schematically illustrates an embodiment of the present invention; Figure 2e schematically illustrates an embodiment of the present invention; Figure 2f schematically illustrates an embodiment of the present invention; Figure 3a schematically illustrates a diagram, according to an aspect of the invention; Figure 3b schematically illustrates a diagram, according to an aspect 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 aspect of the invention; Figure 5 schematically illustrates a computer, according to an embodiment of the invention.

DETAUERAD 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. 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.

Det bor papekas att uppfinningen lampar sig for tillampning hos en godtycklig lamplig motor och är saledes inte begransad till motorfordon. It should be noted that the invention is suitable for application to any suitable engine and is thus not limited to motor vehicles.

Det uppfinningsmassiga forfarandet och den uppfinningsmassiga anordningen for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor enligt en aspekt av uppfinningen lampar sig val for andra plattformar som inbegriper en motor an motorfordon, sasom t.ex. vattenfarkoster. Vattenfarkosterna kan vara av godtyckligt lampligt slag, s5som t.ex. motorbatar, fartyg, farjor eller skepp. 14 537 121 Det uppfinningsmassiga forfarandet och den uppfinningsmassiga anordningen for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor enligt en aspekt av uppfinningen lampar sig aven val for t.ex. system inbegripande exempelvis en stenkross eller dylikt. The inventive method and the inventive device for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine according to an aspect of the invention are suitable for other platforms which include an engine and a motor vehicle, such as e.g. watercraft. The watercraft can be of any suitable type, such as e.g. motor boats, ships, ferries or ships. The inventive method and the inventive device for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine according to an aspect of the invention are also suitable for e.g. systems including, for example, a stone crusher or the like.

Det uppfinningsmassiga forfarandet och den uppfinningsmassiga anordningen for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser frAn en motor enligt en aspekt av uppfinningen lampar sig aven val for t.ex. system inbegripande industrimotorer och/eller motordrivna industrirobotar. The inventive method and the inventive device for delivering function of a sensor arranged to determine the content of a component of exhaust gases from an engine according to an aspect of the invention are also suitable for e.g. systems including industrial engines and / or motorized industrial robots.

Det uppfinningsmassiga forfarandet och den uppfinningsmassiga anordningen for att avgiira funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor enligt en aspekt av uppfinningen lampar sig aven val for olika slag av kraftverk, s5som t.ex. ett elkraftverk innefattande en dieselgenerator. The inventive method and the inventive device for emitting function of a sensor arranged to determine the content of a component of exhaust gases from an engine according to an aspect of the invention are also suitable for different types of power plants, such as e.g. an electric power plant comprising a diesel generator.

Det uppfinningsmassiga forfarandet och den uppfinningsmassiga anordningen for att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fr5n en motor lampar sig val for ett godtyckligt lampligt motorsystem som inbegriper en motor s5som t.ex. hos ett lok eller annan plattform. The inventive method and the inventive device for determining the function of a sensor arranged to determine the content of a component of exhaust gases from an engine illuminate the choice of an arbitrarily suitable engine system which includes an engine such as e.g. at a locomotive or other platform.

Hari hanfor sig termen "lank" till en kommunikationslank som kan vara en fysisk ledning, s5som en opto-elektronisk kommunikationsledning, eller en icke-fysisk ledning, s5som 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 "ledning" till en passage for att halla och transportera en fluid, s5som t.ex. en reduktant i vatskeform. Ledningen kan vara ett ror av godtycklig dimension. Ledningen kan best5 av ett godtyckligt, lampligt material, s5som t.ex. plast, gummi eller metall. 5 10 15 537 121 Hari hanfor sig termerna "reduktant" eller "reduktionsmedel" till ett medel som anvands fOr att reagera med vissa emissioner i ett SCR-system. Dessa emissioner kan t.ex. vara NOR-gas. Termerna "reduktant" och "reduktionsmedel" anvands hari synonymt. Namnda reduktant är enligt ett utforande s.k. AdBlue. Naturligtvis kan andra slag av reduktanter anvandas. In this case the term "line" refers 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. 5 10 15 537 121 Hari refers to the terms "reductant" or "reducing agent" for an agent used to react with certain emissions in an SCR system. These emissions can e.g. be NOR gas. The terms "reductant" and "reducing agent" are used synonymously. Said reductant is according to an embodiment so-called AdBlue. Of course, other types of reductants can be used.

Med hanvisning till Figur 2a visas en anordning 299 hos fordonet 100. Anordningen 299 kan vara anordnad i dragbilen 110. Anordningen innefattar en motor 206. Namnda motor 206 ar en forbranningsmotor, exempelvis en dieselmotor. Namnda motor 206 kan vara en lamplig motor. Namnda motor 206 kan exempelvis drivas med bensin, etanol eller gas. Namnda motor 206 Jr anordnad att leda avgaser till en avgaskanal 290. Referring to Figure 2a, a device 299 of the vehicle 100 is shown. The device 299 may be arranged in the tractor 110. The device comprises an engine 206. Said engine 206 is an internal combustion engine, for example a diesel engine. Said motor 206 may be a lampable motor. Said engine 206 can, for example, be powered by petrol, ethanol or gas. Said engine 206 Jr arranged to direct exhaust gases to an exhaust duct 290.

Anordningen innefattar en forsta styrenhet 200. The device comprises a first control unit 200.

Anordningen 299 innefattar enligt detta exempel en beh5llare 205 som är anordnad att Ulla en reduktant. Beh5llaren 205 är anordnad att inneh511a en lamplig mangd reduktant och Jr vidare anordnad att kunna fyllas p5 vid behov. The device 299 according to this example comprises a container 205 which is arranged to ulla a reductant. The container 205 is arranged to contain a suitable amount of reductant and is further arranged to be able to be filled if necessary.

En forsta ledning 271 Jr anordnad att leda reduktanten till en pump 230 fr5n beh5llaren 205. Pumpen 230 kan vara en godtycklig lamplig pump. Pumpen 230 kan vara anordnad att drivas medelst en elmotor (ej visad). Pumpen 230 kan vara anordnad att pumpa upp reduktanten fr5n behallaren 205 via den forsta ledningen 271 och via en andra ledning 272 tillfora narrinda reduktant till en doseringsenhet 250. A first line 271 is arranged to lead the reductant to a pump 230 from the container 205. The pump 230 may be any suitable pump. The pump 230 may be arranged to be operated by means of an electric motor (not shown). The pump 230 may be arranged to pump up the reductant from the container 205 via the first line 271 and via a second line 272 to supply the narcissant reductant to a dosing unit 250.

Doseringsenheten 250 är anordnad att tillfora namnda reduktant till namnda avgaskanal 290 has fordonet 100. Enligt detta utforande är en SCR-katalysator 270 anordnad nedstroms ett lage hos avgassystemet Or tillforsel av reduktanten sker. 16 537 121 Den mangd reduktant som tillfors i avgassystemet är avsedd att anvandas i SCRkatalysatorn for att reducera mangden oonskade emissioner. The dosing unit 250 is arranged to supply said reductant to said exhaust duct 290 has the vehicle 100. According to this embodiment, an SCR catalyst 270 is arranged downstream of a layer of the exhaust system Or supply of the reductant takes place. 16 537 121 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.

Enligt ett exempelutforande tillhandaals en s.k. 3-vagskatalysator hos namnda avgaskanal 290. Anvandning av Lambda-sensorer är fordelaktig for de fall namnda anordning 299 inbegriper en 3-vagskatalysator. According to an exemplary embodiment, a so-called 3-wave catalyst of said exhaust duct 290. Use of Lambda sensors is advantageous for those cases where said device 299 includes a 3-wave catalyst.

En fOrsta NOx-sensor 255 är anordnad for kommunikation med den fOrsta styrenheten 200 via en lank L255. Den fOrsta NOx-sensorn 255 är anordnad att fortlopande faststalla en r5dande NOx-halt HmeasNox i avgaser fran motorn 206 hos avgaskanalen uppstroms namnda SCR-katalysator 270. Den fOrsta NOx-sensorn 255 är anordnad att fortlopande skicka signaler 5255 innefattande information om en radande NOx-halt HmeasNox uppstroms namnda SCR-katalysator 270 till den fOrsta styrenheten 200. Den fOrsta NOx-sensorn är lostagbart anordnad hos avgaskanalen 290. Harvid kan den fOrsta NOx-sensorn 255 faststalla en radande NOx-halt HmeasNox i avgaser hos avgaskanalen 290. Harvid kan den fOrsta NOxsensorn 255 faststalla en r5dande NOx-halt HmeasNox hos en referensgas som tillfors namnda avgaskanal 290. Harvid kan den fOrsta NOx-sensorn 255 faststalla en r5dande NOx-halt HmeasNox hos en referensgas externt namnda avgaskanal 290. A first NOx sensor 255 is provided for communication with the first control unit 200 via a long L255. The first NOx sensor 255 is arranged to continuously determine a moving NOx content of HmeasNox in exhaust gases from the engine 206 of the exhaust duct upstream of said SCR catalyst 270. The first NOx sensor 255 is arranged to continuously send signals 5255 containing information content of HmeasNox upstream of said SCR catalyst 270 to the first control unit 200. The first NOx sensor is releasably arranged at the exhaust duct 290. In this case, the first NOx sensor 255 can determine a radiating NOx content of HmeasNox in the exhaust gases of the exhaust duct 29. the first NOx sensor 255 determines a moving NOx content HmeasNox of a reference gas supplied to said exhaust duct 290. In this case, the first NOx sensor 255 can determine a moving NOx content HmeasNox of a reference gas externally named exhaust duct 290.

Den fOrsta NOx-sensorn 255 kan for samliga beskrivna fall vara signalansluten till den fOrsta styrenheten 200. The first NOx sensor 255 may, for all described cases, be signal connected to the first control unit 200.

En andra NOR-sensor 265 är anordnad for kommunikation med den fOrsta styrenheten 200 via en lank L265. Den andra NOR-sensorn 265 är anordnad att vid drift fortlopande faststalla en r5dande NOR-halt HmeasNox i avgaser Iran motorn 206 i avgaskanalen 290 nedstroms namnda SCR-katalysator 270. Den andra NORsensorn 265 är anordnad att fortlopande skicka signaler S265 innefattande information om en radande NOR-halt HmeasNox till den forsta styrenheten 200. Den andra NOx-sensorn är lostagbart anordnad hos avgaskanalen 290. Harvid kan den andra NOx-sensorn 265 faststalla en radande NOx-halt HmeasNox i avgaser has 17 537 121 avgaskanalen 290. Harvid kan den andra NOx-sensorn 265 faststalla en radande NOx-halt HmeasNox hos en referensgas som tillfors namnda avgaskanal 290. Harvid kan den andra NOx-sensorn 255 faststalla en rAdande NOx-halt HmeasNox hos en referensgas externt namnda avgaskanal 290. Den andra NOx-sensorn 255 kan for samliga beskrivna fall vara signalansluten till den forsta styrenheten 200. A second NOR sensor 265 is provided for communication with the first control unit 200 via a long L265. The second NOR sensor 265 is arranged to continuously detect during operation a moving NOR content HmeasNox in exhaust gas Iran 206 in the exhaust duct 290 downstream of said SCR catalyst 270. The second NOR sensor 265 is arranged to continuously send signals S265 including information about a radiating NOR content HmeasNox to the first control unit 200. The second NOx sensor is releasably arranged at the exhaust duct 290. In this case, the second NOx sensor 265 can determine a radiating NOx content HmeasNox in exhaust gases has 17 537 121 exhaust duct 290. In this case, the second The NOx sensor 265 determines a radiating NOx content HmeasNox of a reference gas supplied to said exhaust duct 290. In this case, the second NOx sensor 255 can determine a radiating NOx content HmeasNox of a reference gas externally named exhaust duct 290. The second NOx sensor 255 can for all described cases be signal connected to the first control unit 200.

Den forsta styrenheten 200 ar anordnad att kommunicera med respektive NOxsensor 255, 265. Den av NOx-sensorn faststallda NOx-halten HmeasNox hos namnda referensgas kommuniceras till den forsta styrenheten 200. Den forsta styrenheten 200 5r anordnad att jamfora den av namnda NOx-sensor 255, 26 faststallda halten NOx HmeasNox med namnda kanda halt avseende NOx hos namnda referensgas. Den forsta styrenheten 200 är vidare anordnad att avgora funktion hos namnda NOx-sensor 255, 265 p5 basis av resultatet av namnda jamforelse. The first control unit 200 is arranged to communicate with the respective NOx sensor 255, 265. The NOx content HmeasNox determined by the NOx sensor of said reference gas is communicated to the first control unit 200. The first control unit 200 is arranged to compare that of said NOx sensor 255. , 26 determined NOx content HmeasNox with said kanda content with respect to NOx of said reference gas. The first control unit 200 is further arranged to determine the function of said NOx sensor 255, 265 on the basis of the result of said comparison.

En forsta Lambda-sensor 235 är anordnad for kommunikation med den forsta styrenheten 200 via en lank L235. Den forsta Lambda-sensorn 235 är anordnad att vid drift fortlopande faststalla en radande syrehalt HmeasOx hos motorns avgasstrOm uppstr6ms namnda SCR-katalysator 270. Den forsta Lambda-sensorn 235 är anordnad att fortlopande skicka signaler S235 innefattande information om en r5dande syrehalt HmeasOx i avgaserna uppstroms namnda SCR-katalysator 270 till den forsta styrenheten 200. Den forsta Lambda-sensorn 235 är lostagbart anordnad hos avgaskanalen 290. Harvid kan den forsta Lambda-sensorn 235 faststalla en r5dande syrehalt HmeasOx i avgaser hos avgaskanalen 290. Harvid kan den forsta Lambda-sensorn 235 faststalla en r5dande syrehalt HmeasOx hos en referensgas som tillfors namnda avgaskanal 290. Harvid kan den forsta Lambdasensorn 235 faststalla en radande syrehalt HmeasOx hos en referensgas externt namnda avgaskanal 290. Den forsta Lambda-sensorn 235 kan for samliga beskrivna fall vara signalansluten till den forsta styrenheten 200. 18 537 121 En andra Lambda-sensor 245 Jr anordnad for kommunikation med den forsta styrenheten 200 via en lank L245. Den andra Lambda-sensorn 245 är anordnad att vid drift fortlopande faststalla en radande syrehalt HmeasOx hos motorns avgasstrom nedstroms namnda SCR-katalysator 270. Den andra Lambda-sensorn 245 är anordnad att fortlopande skicka signaler 5245 innefattande information om en r5dande syrehalt HmeasOx till den forsta styrenheten 200. Den andra Lambdasensorn Jr lostagbart anordnad hos avgaskanalen 290. Harvid kan den andra Lambda-sensorn 235 faststalla en r5dande syrehalt HmeasOx i avgaser hos avgaskanalen 290. Harvid kan den andra Lambda-sensorn 235 faststalla en radande syrehalt HmeasOx hos en referensgas som tillfOrs namnda avgaskanal 290. Harvid kan den andra Lambda-sensorn 235 faststalla en r5dande syrehalt HmeasOx hos en referensgas externt namnda avgaskanal 290. Den andra Lambda-sensorn 235 kan for samliga beskrivna fall vara signalansluten till den forsta styrenheten 200. A first Lambda sensor 235 is provided for communication with the first control unit 200 via a long L235. The first Lambda sensor 235 is arranged to continuously detect in operation a radiating oxygen content HmeasOx of the engine exhaust stream upstream of said SCR catalyst 270. The first Lambda sensor 235 is arranged to continuously send signals S235 including information about a radiating oxygen content of HmeasOx. said SCR catalyst 270 to the first control unit 200. The first Lambda sensor 235 is releasably arranged at the exhaust duct 290. In this case, the first Lambda sensor 235 can determine a moving oxygen content HmeasOx in exhaust gases of the exhaust duct 290. In this case, the first Lambda sensor can 235 determines a moving oxygen content HmeasOx of a reference gas supplied to said exhaust duct 290. In this case, the first Lambda sensor 235 may determine a radiating oxygen content HmeasOx of a reference gas externally named exhaust duct 290. The first Lambda sensor 235 may be for the first described signal. control unit 200. 18 537 121 A second Lambda sensor 245 Jr arranged for communication with the first control unit 200 via a long L245. The second Lambda sensor 245 is arranged to continuously detect in operation a radiating oxygen content HmeasOx of the engine exhaust stream downstream of said SCR catalyst 270. The second Lambda sensor 245 is arranged to continuously send signals 5245 including information about an increasing oxygen content to the HmeasOx. the control unit 200. The second Lambda sensor Jr is releasably arranged at the exhaust duct 290. In this case, the second Lambda sensor 235 can detect a moving oxygen content HmeasOx in exhaust gases of the exhaust duct 290. In this case, the second Lambda sensor 235 can detect a radiating oxygen content of a reference gas H said second exhaust duct 290. In this case, the second Lambda sensor 235 can determine a moving oxygen content HmeasOx of a reference gas externally named exhaust duct 290. The second Lambda sensor 235 may in all described cases be signal connected to the first control unit 200.

Enligt ett exempelutforande är namnda forsta Lambda-sensor 235 anordnad att vid drift fortlopande faststalla en r5dande syrehalt HmeasOx hos motorns avgasstrom uppstroms en s.k. 3-vagskatalysator (ej visad) anordnad i namnda avgaskanal 290. According to an exemplary embodiment, said first Lambda sensor 235 is arranged to continuously detect a moving oxygen content HmeasOx of the engine exhaust stream upstream of a so-called 3-way catalyst (not shown) arranged in said exhaust duct 290.

Enligt ett exempelutforande Jr namnda andra Lambda-sensor 245 anordnade att anordnad att vid drift fortlopande faststalla en r5dande syrehalt HmeasOx hos motorns avgasstrom nedstroms en s.k. 3-vagskatalysator (ej visad) anordnad i namnda avgaskanal 290. According to an exemplary embodiment, said second Lambda sensor 245 is arranged to be arranged to continuously determine during operation a moving oxygen content HmeasOx of the engine exhaust stream downstream of a so-called 3-way catalyst (not shown) arranged in said exhaust duct 290.

Den forsta styrenheten 200 Jr anordnad att kommunicera med respektive Lambda- sensor 235, 245. Den av Lambda-sensorn faststallda syrehalten HmeasOx hos namnda referensgas kommuniceras till den forsta styrenheten 200. Den forsta styrenheten 200 är anordnad att jamfora den av namnda Lambda-sensor 235, 245 faststallda halten syre HmeasOx med namnda kanda halt syre Ref 1 Ox hos namnda referensgas. Den fOrsta styrenheten 200 Jr vidare anordnad att avgOra funktion hos namnda Lambda-sensor 235, 245 p5 basis av resultatet av namnda jamforelse. 19 537 121 Den forsta styrenheten 200 är anordnad att avgara funktion hos namnda sensor 235, 245, 255, 265. Den forsta styrenheten Sr anordnad att avgara funktion hos namnda sensor 235, 245, 255, 265 p5 basis av resultatet av namnda jamforelse dar namnda sensor 235, 245, 255, 265 exponeras for en forsta referensgas Ref 1 Nox, Ref 1 Ox med en kand halt av namnda komponent och darefter far 5tminstone en ytterligare referensgas, dar namnda ytterligare referensgas har en halt Ref 2 Nox, Ref 2 Ox av namnda komponent som skiljer sig fr5n halten i namnda forsta referensgas. The first control unit 200 is arranged to communicate with the respective Lambda sensor 235, 245. The oxygen content HmeasOx determined by the Lambda sensor of said reference gas is communicated to the first control unit 200. The first control unit 200 is arranged to compare that of said Lambda sensor 235 , 245 fixed content of oxygen HmeasOx with the said kanda content of oxygen Ref 1 Ox of the said reference gas. The first control unit 200 is further arranged to determine the function of said Lambda sensor 235, 245 on the basis of the result of said comparison. The first control unit 200 is arranged to provide function of said sensor 235, 245, 255, 265. The first control unit Sr is arranged to provide function of said sensor 235, 245, 255, 265 p5 on the basis of the result of said comparison with said sensor. sensors 235, 245, 255, 265 are exposed to a first reference gas Ref 1 Nox, Ref 1 Ox with a candle content of said component and then get at least one additional reference gas, where said additional reference gas has a content Ref 2 Nox, Ref 2 Ox of said component which differs from the content of said first reference gas.

Den forsta styrenheten 200 Sr anordnad att avgara funktion hos namnda sensor 235, 245, 255, 265 p5 basis av resultatet av namnda jamforelse dar namnda sensor exponeras for en forsta referensgas med en kand halt Ref 1 Nox, Ref 1 Nox av namnda komponent och darefter far Stminstone en ytterligare referensgas varvid namnda, inbordes olika, kanda halter hos namnda referensgaser valjs for tackande av sensorns matregister. The first control unit 200 is arranged to act on said sensor 235, 245, 255, 265 p5 on the basis of the result of said comparison where said sensor is exposed to a first reference gas with a cand content of Ref 1 Nox, Ref 1 Nox of said component and thereafter at least one additional reference gas, wherein said, inboard different, known levels of said reference gases are selected for filling the sensor's food register.

Enligt det uppfinningsmassiga forfarandet bibehalls den forsta styrenheten 200, under matningen p5 namnda referensgas, signalansluten till namnda sensor, 235, 245, 255, 265, p5 samma satt som vid gangse anvandning av namnda sensor 235, 245, 255, 265. According to the inventive method, the first control unit 200, during the supply p5 of said reference gas, is maintained as a signal connected to said sensor, 235, 245, 255, 265, p5 in the same manner as in the normal use of said sensor 235, 245, 255, 265.

Enligt en utfaringsform av det uppfinningsmassiga forfarandet utfors namnda exponering av en referensgas med namnda sensor 235, 245, 255, 265 anordnad p sin gangse plats hos avgaskanalen 290. Enligt en utforingsform av det uppfinningsmassiga forfarandet utfOrs namnda exponering med namnda sensor 235, 245, 255, 265 anordnad externt namnda avgaskanal 290. According to an embodiment of the inventive method, said exposure is performed by a reference gas with said sensor 235, 245, 255, 265 arranged in its usual place at the exhaust duct 290. According to an embodiment of the inventive method, said exposure is performed with said sensor 235, 245, 255. , 265 arranged externally named exhaust duct 290.

Den forsta styrenheten 200 Sr anordnad for kommunikation med presentationsmedel 280 via en lank L280. Namnda presentationsmedel 280 kan 537 121 vara forefintligt anordnade i en forarhytt hos fordonet 100. Namnda presentationsorgan 280 kan vara fast monterade i fordonet 100. Namnda presentationsorgan 280 kan vara en mobil elektronisk enhet. Namnda presentationsorgan 280 kan inbegripa exempelvis en visningsskarm. Den forsta styrenheten 200 är anordnad att presentera en felkod eller annan relevant information avseende det innovativa forfarandet for att avgiira funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor. Den forsta styrenheten 200 kan vara anordnad att medelst namnda presentationsmedel 280 presentera ett resultat av namnda bedomning eller avgarande om huruvida namnda sensor 235, 245, 255, 265 Jr defekt eller inte. The first control unit 200 Sr arranged for communication with presentation means 280 via a long L280. Said display means 280 may 537 121 be presently arranged in a cab of the vehicle 100. Said display means 280 may be fixedly mounted in the vehicle 100. Said display means 280 may be a mobile electronic unit. Said display means 280 may include, for example, a display screen. The first control unit 200 is arranged to present an error code or other relevant information regarding the innovative method for emitting function of a sensor arranged to determine the content of a component of exhaust gases from an engine. The first control unit 200 may be arranged to present by means of said presentation means 280 a result of said judgment or a decision as to whether or not said sensor 235, 245, 255, 265 is defective.

Den fOrsta styrenheten 200 är anordnad for kommunikation med en kommunikationsenhet 285 via en lank L285. Namnda kommunikationsenhet 285 kan vara forefintlig hos exempelvis en servicestation, verkstad, akeriagare eller ett s.k. fleet management system. The first control unit 200 is arranged for communication with a communication unit 285 via a long L285. Said communication unit 285 may be present in, for example, a service station, workshop, haulier or a so-called fleet management system.

Namnda kommunikationsenhet 285 kan vara forefintligt anordnad i en forarhytt hos fordonet 100. Namnda kommunikationsenhet 285 kan vara fast monterad i fordonet 100. Namnda kommunikationsenhet 285 kan vara en mobil elektronisk 20 enhet. Namnda kommunikationsenhet 285 kan inbegripa exempelvis en visningsskarm. Den forsta styrenheten 200 Jr anordnad att automatiskt eller vid begat-an presentera en felkod eller annan relevant information avseende det uppfinningsmassiga forfarandet for att avgara funktion hos en sensor 235, 245, 255, 265 anordnad att faststalla halt av en komponent hos avgaser fr5n en motor 206. Said communication unit 285 may be provided in a driver's cab of the vehicle 100. Said communication unit 285 may be fixedly mounted in the vehicle 100. Said communication unit 285 may be a mobile electronic unit. Said communication unit 285 may include, for example, a display screen. The first control unit 200 is arranged to automatically or at the request present an error code or other relevant information regarding the inventive method for discharging function of a sensor 235, 245, 255, 265 arranged to determine the content of a component of exhaust gases from an engine. 206.

Den forsta styrenheten 200 kan vara anordnad att medelst namnda kommunikationsterminal 285 presentera ett resultat om huruvida namnda sensor är defekt eller inte. The first control unit 200 may be arranged to present by means of said communication terminal 285 a result as to whether said sensor is defective or not.

En andra styrenhet 210 Jr anordnad for kommunikation med den forsta styrenheten 200 via en lank L210. Den andra styrenheten 210 kan vara lostagbart 21 537 121 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 enligt uppfinningen. 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, sasom t.ex. att avgbra funktion hos en sensor 235, 245, 255, 265 anordnad att faststalla halt av en komponent hos avgaser fran en motor. Den andra styrenheten 210 kan exempelvis vara anordnad att faststalla en halt av namnda komponent hos namnda referensgas medelst namnda sensor 235, 245, 255, 265. Den andra styrenheten 210 kan vara anordnad att jamfora den salunda faststallda halten med namnda kanda halt avseende namnda komponent och bedoma namnda funktion pa basis av resultatet av namnda jämforelse. 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 detachably 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 method steps according to the invention. 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 the same functions as the first control unit 200, such as e.g. to discharge function of a sensor 235, 245, 255, 265 arranged to determine the content of a component of exhaust gases from an engine. The second control unit 210 may, for example, be arranged to determine a content of said component of said reference gas by means of said sensors 235, 245, 255, 265. The second control unit 210 may be arranged to compare the thus determined content with said jug content with respect to said component and judge said function on the basis of the result of said comparison.

Med hanvisning till Figur 2b visas en anordning enligt ett utforande av fOreliggande uppfinning. Sensorn 235, 245, 255, 265 är signalansluten till den forsta styrenheten 200 pa samma satt som vid sensorns gangse anvandning. Sensorn är enligt detta exempelutforande anordnad externt namnda avgaskanal 290. Ett mathus 275 är lOstagbart sammankopplat med sensorn 235, 245, 255, 265. Namnda mathus 275 är anpassat att kopplas samman med namnda sensor 235, 245, 255, 265 pa lampligt satt. Enligt ett exempelutforande kan namnda mathus 275 gangas ihop med namnda sensor 235, 245, 255, 265. Enligt ett exempelutforande kan namnda mathus 275 kopplas samman med namnda sensor 235, 245, 255, 265 via sparrhakar, via en insnappningsfunktion eller via en annan lamplig lasmekanism. Mathuset 275 är via en ledning 277 sammankopplat med en extern gaskalla 276. Den externa gaskallan 276 innehaller namnda referensgas med en kand halt av namnda komponent dar namnda referensgas är trycksatt. Flodet av referensgas 22 537 121 frAn den externa gaskallan 276 till mathuset 275 kan regleras via en ventilanordning 279. Namnda ventilanordning 279 kan regleras via ett lampligt styrsystem, exempelvis via den forsta styrenheten 200 eller alternativt manuellt via ett vred eller annat lampligt styrorgan. Vid matning oppnas namnda ventilanordning 279 under en viss forutbestamd tidsrymd, exempelvis en tidsperiod mellan 1 och minuter. Da namnda referensgas i den externa gaskallan 276 är trycksatt pressas n5mnda referensgas fran namnda gaskalla 276 via ledningen 277 till mathuset 275. For att sakerstalla att namnda referensgas omger namnda sensor 235, 245, 255, 265 har en oppning i namnda mathus 275 anordnats. Referensgasen flodar sAledes, under namnda matning, -Wan den externa gaskallan 276 till mathuset 275 och darefter ut ur mathuset 275 via namnda 6ppning. D5 mathuset 275 omsluter namnda sensor 235, 245, 255, 265 kommer namnda referensgas vid namnda matning omge namnda sensor 235, 245, 255, 265 och sakerstalla att halten av namnda komponent i namnda referensgas detekteras. Namnda sensor 235, 245, 255, 265, detekterar en halt av namnda komponent och skickar signaler innehallande information ang5ende den detekterade halten HmeasNox, HmeasOx av namnda komponent till den forsta styrenheten 200. Styrenheten 200 är harvid anordnad att jamfora namnda detekterade halter med de kanda halterna Ref 1 Nox, Ref 1 Ox, Ref 2 Nox, Ref 2 Ox hos respektive referensgas och kan p5 basis av denna jamforelse avgora om namnda sensor 235, 245, 255, 265 Jr defekt eller inte. Referring to Figure 2b, a device according to an embodiment of the present invention is shown. The sensors 235, 245, 255, 265 are signal connected to the first control unit 200 in the same manner as in the normal use of the sensor. According to this exemplary embodiment, the sensor is arranged externally to said exhaust duct 290. A food housing 275 is detachably connected to the sensor 235, 245, 255, 265. Said food housing 275 is adapted to be connected to said sensor 235, 245, 255, 265 in a suitable manner. According to an exemplary embodiment, said food housing 275 can be connected to said sensor 235, 245, 255, 265. According to an exemplary embodiment, said food housing 275 can be connected to said sensor 235, 245, 255, 265 via pawls, via a snap-in function or via another suitable welding mechanism. The feed housing 275 is connected via a line 277 to an external gas source 276. The external gas source 276 contains said reference gas with a known content of said component where said reference gas is pressurized. The flow of reference gas 22 537 121 from the external gas source 276 to the feed housing 275 can be regulated via a valve device 279. Said valve device 279 can be controlled via a lamp control system, for example via the first control unit 200 or alternatively manually via a knob or other lamp control means. During feeding, said valve device 279 is opened for a certain predetermined period of time, for example a time period between 1 and minutes. When said reference gas in the external gas source 276 is pressurized, said reference gas is pressed from said gas source 276 via line 277 to the feed housing 275. To ensure that said reference gas surrounds said sensor 235, 245, 255, 265, an opening in said feed housing 275 is provided. Thus, during said feed, the reference gas flows from the external gas source 276 to the feed housing 275 and then out of the feed housing 275 via said opening. D5 the feed housing 275 encloses said sensor 235, 245, 255, 265, said reference gas at said feed surrounds said sensor 235, 245, 255, 265 and ensures that the content of said component in said reference gas is detected. Said sensor 235, 245, 255, 265, detects a content of said component and sends signals containing information regarding the detected content HmeasNox, HmeasOx of said component to the first control unit 200. The control unit 200 is thereby arranged to compare said detected levels with the known the levels Ref 1 Nox, Ref 1 Ox, Ref 2 Nox, Ref 2 Ox of the respective reference gas and can on the basis of this comparison determine whether the said sensor 235, 245, 255, 265 Jr defective or not.

Enligt en utforingsform floclar referensgasen ut fr5n namnda mathus 275 till omgivande luft. Enligt en utforingsform flodar referensgasen ut fr5n namnda mathus 275 till ett karl (ej visat) anordnat att suga upp och mottaga namnda referensgas. According to one embodiment, the reference gas flocks out of said feed housing 275 into ambient air. According to one embodiment, the reference gas flows out of said feed housing 275 to a vessel (not shown) arranged to suck up and receive said reference gas.

Med hanvisning till Figur 2c visas en anordning enligt ett utforande av foreliggande uppfinning. Anordningen i figur 2c skiljer sig fran anordningen beskriven i figur 2b genom att ytterligare en extern referensgaskalla 276b 5r sammankopplad med mathuset 275. Harvid är en referensgaskalla 276a kopplad i flodeskommunikation 23 537 121 med namnda mathus 275 via en ledning 277a inbegripande en ventilanordning 279. Flarvid är namnda ytterligare referensgaskalla 276b kopplad i flOdeskommunikation med namnda mathus 275 via en ledning 277b inbegripande en ventilanordning 279. Enligt denna utforingsform kan namnda sensor 235, 245, 255, 265 exponeras for tv referensgaser genom att styra ventilerna 279 till respektive externa gaskalla 276a, 276b, utan att koppla om anordningen. De externa gaskallorna 276a, 276b innehaller namnda referensgaser med inbiirdes olika kanda halter av namnda komponent. Vid matning tillfors vid en forsta tidpunkt en forsta referensgas fr5n den forsta externa gaskallan 276a in i mathuset 275 under en viss forutbestamd tid, exempelvis 2 minuter. Namnda sensor 235, 245, 255, 265, detekterar en halt av namnda komponent och skickar signaler inneh5llande information ang5ende den detekterade halten av namnda komponent till den forsta styrenheten 200. Vid en andra tidpunkt tillfors en andra referensgas fr5n en andra extern gaskalla 276b in i mathuset 275 under en viss forutbestamd tid, exempelvis 2 minuter. Namnda sensor 235, 245, 255, 265, detekterar en halt av namnda komponent och skickar signaler inneh5llande information angaende den detekterade halten av namnda komponent till den forsta styrenheten 200. Styrenheten 200 är harvid anordnad att jamfora namnda detekterade halter av namnda komponent med de kanda halterna av namnda komponent hos respektive forsta och andra referensgas och kan p basis av denna jamforelse avgara om namnda sensor 235, 245, 255, 265 är defekt eller inte. Referring to Figure 2c, a device according to an embodiment of the present invention is shown. The device in Figure 2c differs from the device described in Figure 2b in that a further external reference gas head 276b 5r is connected to the feed housing 275. In this case, a reference gas head 276a is connected in river communication 23 537 121 to said feed housing 275 via a line 277a including a valve device 279. Flarvid said additional reference gas source 276b is connected in flow communication with said feed housing 275 via a line 277b including a valve device 279. According to this embodiment, said sensor 235, 245, 255, 265 can be exposed to two reference gases by controlling the valves 279 to respective external gas source 276a, 276 , without switching the device. The external gas skulls 276a, 276b contain said reference gases with different known contents of said component. When feeding, at a first time a first reference gas from the first external gas source 276a is supplied into the feed housing 275 for a certain predetermined time, for example 2 minutes. Said sensor 235, 245, 255, 265, detects a content of said component and sends signals containing information regarding the detected content of said component to the first control unit 200. At a second time a second reference gas from a second external gas source 276b is supplied into the food house 275 for a certain predetermined time, for example 2 minutes. Said sensor 235, 245, 255, 265, detects a content of said component and sends signals containing information regarding the detected content of said component to the first control unit 200. The control unit 200 is thereby arranged to compare said detected levels of said component with the known the levels of said component of the first and second reference gases, respectively, and can, on the basis of this comparison, determine whether or not said sensors 235, 245, 255, 265 are defective.

Enligt ett utforande kan respektive referensgaskalla vara ansluten i flodeskommunikation med ett tillhorande mathus 275 via en darfor avsedd ledning. According to one embodiment, the respective reference gas head can be connected in river communication with an associated dining house 275 via a dedicated line.

Harvid tillhandahalls saledes ett mathus 275 for varje referensgaskalla. Thus, a dining housing 275 is provided for each reference gas skull.

Med hanvisning till Figur 2d visas en anordning enligt ett utforande av foreliggande uppfinning. Namnda sensor 235, 245, 255, 265 är signalansluten till den forsta styrenheten 200 hos namnda motor 206 p'S samma satt som vid sensorns gangse anyandning. Sensorn är enligt detta utforingsexempel anordnad p5 sin gangse plats 24 537 121 hos avgaskanalen 290. En forsta extern gaskalla 276 som innehaller en forsta referensgas med en kand halt av namnda komponent Jr via en ledning 277 sammankopplad med namnda avgaskanal 290. Namnda ledning 277 kan inbegripa en ventilanordning 279. Enligt ett utforingsexempel kan ett flertal externa gaskallor som inneh5lIer referensgaser med inbordes olika !can& halter av namnda komponent sammankopplas med namnda avgaskanal 290. Vid matning oppnas en ventil sa att namnda referensgas floclar fran den externa gaskallan 276 in i namnda avgaskanal 290 under en viss forutbestamd tid, exempelvis 3 minuter. Namnda sensor 235, 245, 255, 265, detekterar en halt av namnda komponent och skickar signaler innehallande information angaende den detekterade halten av namnda komponent till styrenheten 200. Enlig ett utforingsexempel kan vid en andra tidpunkt en andra referensgas Was in i avgaskanalen 290 fr5n en andra extern gaskalla (ej visad) under en viss forutbestamd tid. Namnda sensor 235, 245, 255, 265, detekterar en halt av namnda komponent och skickar signaler inneh5llande 15 information angSende den detekterade halten av namnda komponent till styrenheten. Styrenheten jamfor namnda detekterade halter med de kanda halterna hos respektive forsta och andra referensgas och kan med hjalp av denna jamforelse avgOra funktion hos namnda sensor 235, 245, 255, 265. Referring to Figure 2d, a device according to an embodiment of the present invention is shown. Said sensor 235, 245, 255, 265 are signal connected to the first control unit 200 of said motor 206 p'S in the same manner as in the case of the sensor's normal breathing. According to this exemplary embodiment, the sensor is arranged in its usual location 24 537 121 at the exhaust duct 290. A first external gas source 276 which contains a first reference gas with a candle content of said component Jr via a line 277 connected to said exhaust duct 290. Said line 277 may include a valve device 279. According to an exemplary embodiment, a plurality of external gas sources containing reference gases with inboard different contents of said component may be connected to said exhaust duct 290. Upon feeding, a valve is opened so that said reference gas flows from the external gas source 276 into said gas duct 296. for a certain predetermined time, for example 3 minutes. Said sensor 235, 245, 255, 265, detects a content of said component and sends signals containing information regarding the detected content of said component to the control unit 200. According to an exemplary embodiment, at a second time a second reference gas may enter the exhaust duct 290 from a other external gas source (not shown) for a certain predetermined time. Said sensor 235, 245, 255, 265, detects a content of said component and sends signals containing information regarding the detected content of said component to the control unit. The control unit compares the detected levels with the known levels of the first and second reference gases, respectively, and can, with the aid of this comparison, determine the function of the said sensors 235, 245, 255, 265.

Med hanvisning till figur 2e visas en h5llare 295 anordnad att hAlla namnda sensor 235, 245, 255, 265 vid matning av namnda komponent hos namnda referensgas da namnda sensor 235, 245, 255, 265 är anordnad externt namnda avgaskanal 290. Namnda h5llare 295 kan anordnas lostagbart i en oppning i namnda avgaskanal 290 dar namnda sensor 235, 245, 255, 265 är placerad pa sin gangse plats i namnda avgaskanal 290. Namnda oppning kan enligt ett utforingsexempel vara anordnad att halla namnda sensor 235, 245, 255, 265 cla namnda sensor Jr placerad p5 sin gangse plats i namnda avgaskanal 290. Namnda h5llare 295 kan vara lostagbart anordnad hos namnda oppning p5 lampligt sat, exempelvis medelst gangor. Hallaren 295 kan inbegripa tvenne bojliga h5llardon fOr att tillhandah51Ia enkel applicering av sensorn 235, 245, 255, 265 tillika enkel borttagning av sensorn. 537 121 Hallaren kan utg6ras av ett lampligt material, exempelvis st51, eller en annan lampligt metallegering eller plast. Referring to Figure 2e, a holder 295 is shown arranged to hold said sensor 235, 245, 255, 265 when feeding said component of said reference gas, said sensor 235, 245, 255, 265 being arranged externally to said exhaust duct 290. Said holder 295 may is arranged releasably in an opening in said exhaust duct 290 where said sensor 235, 245, 255, 265 is placed in its usual place in said exhaust duct 290. According to an exemplary embodiment, said opening can be arranged to hold said sensor 235, 245, 255, 265 cla said sensor Jr placed in its aisle place in said exhaust duct 290. Said holder 295 may be releasably arranged at said opening in a suitable manner, for example by means of aisles. The holder 295 may include two flexible holders for providing easy application of the sensor 235, 245, 255, 265 as well as easy removal of the sensor. 537 121 The holder can be made of a suitable material, for example steel, or another suitable metal alloy or plastic.

Med hanvisning till figur 2f visas namnda sensor 235, 245, 255, 265 lostagbart anordnad i namnda hallare 295. Referring to Figure 2f, said sensor 235, 245, 255, 265 is releasably mounted in said holder 295.

Med hanvisning till Figur 3a visas ett diagram enligt ett utforande av fOreliggande uppfinning dar namnda sensor är en NOx-sensor. 1 Figur 3a visas uppmatt NOx-halt HmeasNox som funktion av referensgasens NOx-halt. NOx-halterna anges i termer av ppm (eng. parts per milion). Enligt ett utforande av fOreliggande uppfinning utfors 5tminstone tv5 matningar avseende 5tminstone tv5 referensgaser, Ref 1 NOx, Ref 2 NOx. Namnda referensgas NOx-halt kan valjas p5 lampligt satt sa att sensorns hela matregister tacks in. Enligt ett exempel kan en gas innefattande en NOx-halt om 900 ppm anvandas som referensgas. Enligt ett exempel kan en andra referensgas best5 av luft dar namnda NOx-halt är 0 ppm. Referring to Figure 3a, a diagram according to an embodiment of the present invention is shown in which said sensor is a NOx sensor. Figure 3a shows the measured NOx content HmeasNox as a function of the NOx content of the reference gas. NOx levels are given in terms of ppm (parts per million). According to an embodiment of the present invention, at least two feedings are performed with respect to at least two reference gases, Ref 1 NOx, Ref 2 NOx. The said reference gas NOx content can be selected in an appropriate manner so that the sensor's entire food register is thanked. According to one example, a gas comprising a NOx content of 900 ppm can be used as the reference gas. According to one example, a second reference gas may consist of air where said NOx content is 0 ppm.

Enligt en aspekt av foreliggande uppfinning kan ett intervall bestammas inom vilket namnda NOx-sensor anses vara korrekt. Namnda intervall kan variera beroende p5 namnda NOx-halt hos namnda referensgas. Enligt ett exempel kan namnda intervall vara +1-10 ppm d5 namnda referensgas innehaller 900 ppm NOx. Enligt ett exempel kan namnda intervall vara +/-5ppm d5 namnda referensgas innehaller 0 ppm NOx. Namnda intervall kan aven bestammas beroende p5 hur noggrant namnda referensgashalt är uppmatt. Enligt en aspekt av uppfinningen anses sensorn 255, 265, vara defekt d5 sensorn detekterar en halt NOx HmeasNox som hamnar utanfor namnda intervall. 1 Figur 3a visas matvarden fr5n en forsta sensor 255, sensor 1, och en andra sensor 265, sensor 2. Enligt detta utforingsexempel har tv5 referensgaser, med en forsta kand halt NOx, Ref 1 NOx, samt en andra kand halt NOx, Ref 2 NOx, anvants. Sensor 1 visar matvarden far respektive referensgas vilka befinner sig inom ett forutbestamt intervall far respektive referensgas. Sensor 2 visar matvarden for respektive referensgas som befinner sig utanfor ett forutbestamt intervall. S5ledes 26 537 121 kan det konstateras att funktionen for sensor 1 är korrekt samt att funktionen for sensor 2 är felaktiedefekt. Enligt ett utforande av foreliggande uppfinning anvands endast en referensgas for att avgara funktion hos en NOx-sensor. Enligt ett annat utforande anvands 5tminstone tv5 referensgaser for att avgiira funkton hos en NOx- sensor. According to one aspect of the present invention, an interval may be determined within which said NOx sensor is considered to be correct. Said range may vary depending on said NOx content of said reference gas. According to an example, said range may be + 1-10 ppm d5 said reference gas contains 900 ppm NOx. According to an example, said range may be +/- 5ppm d5 said reference gas contains 0 ppm NOx. Said intervals can also be determined depending on how accurately said reference gas content is measured. According to one aspect of the invention, the sensors 255, 265 are considered to be defective d5 the sensor detects a NOx HmeasNox content which falls outside said range. Figure 3a shows the food value from a first sensor 255, sensor 1, and a second sensor 265, sensor 2. According to this embodiment, tv5 has reference gases, with a first edge content NOx, Ref 1 NOx, and a second edge content NOx, Ref 2 NOx, anvants. Sensor 1 shows the food values for father and reference gas, respectively, which are within a predetermined interval for father and reference gas, respectively. Sensor 2 shows the food value for each reference gas that is outside a predetermined interval. Thus, it can be stated that the function of sensor 1 is correct and that the function of sensor 2 is faulty. According to an embodiment of the present invention, only a reference gas is used to provide function of a NOx sensor. According to another embodiment, at least two reference gases are used to emit the function of a NOx sensor.

Enligt en aspekt av uppfinningen utfors namnda matningar d5 NOx-sensorn 255, 265, är anordnad p5 sin gangse plats hos avgaskanalen 290. According to one aspect of the invention, said feeds are performed d5 the NOx sensor 255, 265, are arranged p5 in their usual location at the exhaust duct 290.

Enligt en aspekt av uppfinningen utfors namnda matningar d5 NOx-sensorn 255, 265, är anordnad externt namnda avgaskanal 290. According to an aspect of the invention, said feeds are performed d5 The NOx sensor 255, 265, is arranged externally said exhaust duct 290.

Med hanvisning till Figur 3b visas ett diagram enligt ett utforande av foreliggande uppfinning dar namnda sensor 235, 245, är en Lambda-sensor. I Figur 3b visas upprnatt syrehalt HmeasOx p5 y-axeln och referensgasens syrehalt visas p5 x-axeln. Referring to Figure 3b, there is shown a diagram according to an embodiment of the present invention in which said sensor 235, 245, is a Lambda sensor. Figure 3b shows the achieved oxygen content HmeasOx p5 y-axis and the oxygen content of the reference gas shows the p5 x-axis.

Syrehalten anges i termer av procent [N. Enligt ett utforande av namnda uppfinning utfors atminstone tv5 matningar p5 5tminstone tv5 referensgaser, Ref 1 Ox, Ref 2 Ox. Syrehalt hos namnda referensgas kan valjas p5 lampligt s5tt s5 att sensorns hela matregister tacks in. The oxygen content is given in terms of percent [N. According to an embodiment of the said invention, at least two feeds are carried out on at least two reference gases, Ref 1 Ox, Ref 2 Ox. The oxygen content of said reference gas can be chosen in an appropriate manner so that the entire food register of the sensor is thanked.

Enligt ett exempel kan en referensgas besta av 100% kvavgas. Enligt ett exempel kan en referensgas best5 av 79% kvavgas och 21% syrgas. Enligt ett exempel kan en referensgas best5 av 99% kvavgas och 1% syrgas. Enligt ett exempel kan en referensgas best5 av 99,5% kvavgas och 0,5% syrgas. Enligt ett exempel kan namnda referensgas besta av upp till 21% syrgas. According to one example, a reference gas may consist of 100% nitrogen gas. According to one example, a reference gas may consist of 79% nitrogen gas and 21% oxygen gas. According to one example, a reference gas may consist of 99% nitrogen gas and 1% oxygen gas. According to one example, a reference gas may consist of 99.5% nitrogen gas and 0.5% oxygen gas. According to one example, said reference gas may consist of up to 21% oxygen.

Enligt en aspekt av foreliggande uppfinning kan ett intervall bestammas, inom vilket en av namnda Lambda-sensor detekterad syrehalt ska befinna sig for att namnda Lambda-sensor ska anses vara korrekt. Namnda intervall kan valjas beroende p namnda syrehalt hos namnda referensgas. Enligt ett exempel kan namnda intervall 27 537 121 vara +/- 0,5% c15 namnda referensgas innehaller 21% syre. Enligt ett exempel kan namnda intervall vara +/- 0,1% da namnda referensgas innehaller 21% syre. Namnda intervall kan aven valjas beroende p5 hur noggrant namnda referensgashalt är uppmatt. Enligt en aspekt av uppfinningen anses sensorn vara defekt da sensorn detekterar en syrehalt HmeasOx som hamnar utanfor namnda forutbestamda intervall. I Figur 3b visas matvarden fran en forsta sensor 235, sensor 1 och en andra sensor 245, sensor 2. Enligt detta utforingsexempel har tv5 referensgaser, med en forsta kand halt syre, Ref 1 Ox, samt en andra kand halt syre, Ref 2 Ox, anvants. Sensor 1 visar matvarden far respektive referensgas vilka befinner sig inom ett farutbestamt intervall for respektive referensgas. Sensor 2 visar matvarden for respektive referensgas som befinner sig utanfor ett forutbestamt intervall. S5ledes kan det konstateras att funktionen for sensor 1 är korrekt samt att funktionen for sensor 2 är defekt. Enligt ett utforande av foreliggande uppfinning anvands endast en referensgas for att avgara funktion hos en Lambda-sensor. Enligt ett annat utforande anvands atminstone tvreferensgaser for att avgara funkton hos en Lambda-sensor. According to one aspect of the present invention, an interval may be determined within which an oxygen content detected by said Lambda sensor must be located in order for said Lambda sensor to be considered correct. Said range can be selected depending on said oxygen content of said reference gas. According to an example, said range 27 537 121 may be +/- 0.5% c15 said reference gas contains 21% oxygen. According to an example, said range may be +/- 0.1% as said reference gas contains 21% oxygen. Said intervals can also be selected depending on how accurately said reference gas content is measured. According to one aspect of the invention, the sensor is considered defective when the sensor detects an oxygen content of HmeasOx which falls outside said predetermined range. Figure 3b shows the food value from a first sensor 235, sensor 1 and a second sensor 245, sensor 2. According to this exemplary embodiment, tv5 has reference gases, with a first candle containing oxygen, Ref 1 Ox, and a second candle containing oxygen, Ref 2 Ox , anvants. Sensor 1 shows the food values for the respective reference gas which are within a danger-determined range for the respective reference gas. Sensor 2 shows the food value for each reference gas that is outside a predetermined interval. Thus, it can be stated that the function of sensor 1 is correct and that the function of sensor 2 is defective. According to an embodiment of the present invention, only a reference gas is used to provide function of a Lambda sensor. According to another embodiment, at least two reference gases are used to emit the function of a Lambda sensor.

Enligt en aspekt av uppfinningen utfors namnda matningar dã namnda Lambda-sensor 235, 245 är anordnad p5 sin gangse plats hos avgaskanalen 290. According to one aspect of the invention, said feeds are performed when said Lambda sensor 235, 245 is arranged in its usual location at the exhaust duct 290.

Enligt en aspekt av uppfinningen utfors namnda matningar da namnda Lambda-sensor 235, 245 är anordnad externt namnda avgaskanal 290. According to an aspect of the invention, said feeds are performed when said Lambda sensor 235, 245 is arranged externally said exhaust duct 290.

Figur 4a illustrerar schematiskt ett flodesschema Over ett forfarande for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser Iran en motor. Forfarandet innefattar ett forsta forfarandesteg s401. Steget s401 inbegriper stegen att: - exponera namnda sensor for en referensgas, annan an namnda avgaser, med en kand halt av namnda komponent; 28 537 121 faststalla en halt av namnda komponent hos namnda referensgas medelst namnda sensor; jamfora den sAlunda faststallda halten med namnda kanda halt avseende namnda komponent; och - bedoma namnda funktion p5 basis av resultatet av namnda jamforelse. Figure 4a schematically illustrates a flow chart of a method for discharging the function of a sensor arranged to determine the content of a component of exhaust gases in an engine. The process comprises a first process step s401. Step s401 comprises the steps of: - exposing said sensor to a reference gas, other than said exhaust gases, with a candle content of said component; Determining a content of said component of said reference gas by means of said sensor; comparing the thus determined content with said kanda content with respect to said component; and - judging said function on the basis of the result of said comparison.

Efter steget s401 avslutas forfarandet. After step s401, the procedure is terminated.

Figur 4b illustrerar schematiskt ett flodesschema aver en del av ett forfarande for att avgara funktion hos en sensor 235, 245, 255, 265 anordnad att faststalla halt av en komponent hos avgaser fr5n en motor 206, enligt en aspekt av fareliggande uppfinning. Figure 4b schematically illustrates a flow chart of a part of a method for preventing operation of a sensor 235, 245, 255, 265 arranged to determine the content of a component of exhaust gases from an engine 206, according to an aspect of the present invention.

Forfarandet inbegriper ett forsta forfarandesteg s410. Forfarandesteget s410 kan inbegripa steget att aktivera det uppfinningsmassiga forfarandet. Namnda aktivering kan utforas av en operator hos fordonet 100. Namnda aktivering kan utforas av verkstadspersonal eller servicepersonal hos en verkstad respektive serviceanlaggning. Namnda aktivering kan ske medelst namnda presentationsmedel 280 och/eller namnda kommunikationsenhet 285. The process includes a first process step s410. The method step s410 may include the step of activating the inventive method. Said activation can be performed by an operator of the vehicle 100. Said activation can be performed by workshop personnel or service personnel of a workshop or service facility. Said activation can take place by means of said presentation means 280 and / or said communication unit 285.

Forfarandesteget s410 kan inbegripa steget att anordna namnda sensor 235, 245, 255, 265 externt namnda avgaskanal 290. D5 sensorn 235, 245, 255, 265 anordnas externt namnda avgaskanal 290 kopplas ett mathus 275 till namnda sensor. Namnda mathus 275 är kopplat till en extern gaskalla 276 i vilken en referensgas halls. Enligt ett exempel kan namnda sensor 235, 245, 255, 265 anordnas externt namnda avgaskanal 290 i en hallare 295. Namnda hallare 295 kan enligt ett exempel vara anordnad i oppningen som namnda sensor 235, 245, 255, 265 är anordnad i, vid gangse anvandning av namnda sensor. 29 537 121 Forfarandesteget 5410 kan inbegripa steget att ansluta en extern gaskalla 276 i vilken en referensgas halls till namnda avgaskanal 290. Enligt detta utforingsexempel bibehalls sensorn 235, 245, 255, 265 placerad p5 sin gangse plats. The method step s410 may include the step of arranging said sensor 235, 245, 255, 265 externally said exhaust duct 290. D5 the sensor 235, 245, 255, 265 are arranged externally said exhaust duct 290 a dining house 275 is connected to said sensor. Said food housing 275 is connected to an external gas source 276 in which a reference gas is kept. According to an example, said sensor 235, 245, 255, 265 may be arranged externally, said exhaust duct 290 in a holder 295. According to an example, said holder 295 may be arranged in the opening in which said sensor 235, 245, 255, 265 is arranged, at a time use of said sensor. The process step 5410 may include the step of connecting an external gas source 276 in which a reference gas is held to said exhaust duct 290. According to this embodiment, the sensor 235, 245, 255, 265 is maintained in its usual location.

Forfarandesteget s410 kan inbegripa steget att 5stadkomma forutbestamda driftbetingelser, exempelvis i form av en bestamd lagsta temperaturniva hos namnda sensor 235, 245, 255, 265. Denna temperaturniva kan styras via motorns styrsystem 200. The process step s410 may include the step of establishing predetermined operating conditions, for example in the form of a predetermined minimum temperature level of said sensor 235, 245, 255, 265. This temperature level can be controlled via the engine control system 200.

Efter forfarandesteget 5410 utfors ett efterfoljande forfarandesteg s420. After step 5410, a subsequent step s420 is performed.

Forfarandesteget s420 inbegriper steget att exponera namnda sensor 235, 245, 255, 265 far en forsta referensgas. Namnda forsta referensgas har en kand halt Ref 1 Nox, Ref 1 Ox av en komponent. Forfarandesteget s420 kan inbegripa steget att med hjalp av ett avertryck lata namnda referensgas flocla p5 lampligt satt hos namnda sensor under en viss forutbestamd tid, t ex 2 minuter. Denna tid valjs for att sakerstalla att sensorn omges helt av namnda referensgas. The process step s420 includes the step of exposing said sensor 235, 245, 255, 265 to a first reference gas. The said first reference gas has a cand content of Ref 1 Nox, Ref 1 Ox of one component. The process step s420 may include the step of, with the aid of an overpressure, letting said reference gas flocculate p5 suitably with the said sensor for a certain predetermined time, for example 2 minutes. This time is selected to ensure that the sensor is completely surrounded by said reference gas.

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

Forfarandesteget s430 kan inbegripa steget att med hjalp av sensorn 235, 245, 255, 265 faststalla en halt HmeasNox, HmeasOx av namnda komponent hos namnda farsta referensgas. The process step s430 may include the step of determining with the aid of the sensor 235, 245, 255, 265 a content of HmeasNox, HmeasOx of said component of said first reference gas.

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

Forfarandesteget s440 kan inbegripa steget att jamfora den faststallda halten HmeasNox, HmeasOx med den kanda halten Ref 1 Nox, Ref 1 Ox hos namnda forsta referensgas avseende namnda komponent. Jamforelsen kan utforas av en lamplig enhet hos motorns styrsystem, exempelvis den forsta styrenheten 200, eller den 537 121 andra styrenheten 210, eller av namnda kommunikationsenhet 285. DS den faststallda halten HmeasNox, HmeasOx befinner sig inom ett visst forutbestamt intervall som omger den kanda halten Ref 1 Nox, Ref 1 Ox av namnda komponent kan det konstateras/faststallas att sensorn 235, 245, 255, 265 är korrekt. DS den faststallda halten befinner sig utom ett visst forutbestamt intervall som omger den kanda halten av namnda komponent kan det konstateras/faststallas att sensorn Sr defekt. The process step s440 may include the step of comparing the determined content of HmeasNox, HmeasOx with the known content of Ref 1 Nox, Ref 1 Ox of said first reference gas with respect to said component. The comparison can be made by an appropriate unit of the engine control system, for example the first control unit 200, or the 537 121 second control unit 210, or by the said communication unit 285. DS the fixed content HmeasNox, HmeasOx is within a certain predetermined range surrounding the known content Ref 1 Nox, Ref 1 Ox of the said component, it can be stated / determined that the sensor 235, 245, 255, 265 is correct. If the determined content is outside a certain predetermined interval which surrounds the known content of said component, it can be ascertained / determined that the sensor Sr is defective.

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

Forfarandesteget s450 kan inbegripa steget att exponera namnda sensor 235, 245, 255, 265 far en andra referensgas. Namnda andra referensgas har en kand halt Ref 2 Nox, Ref 2 Ox av en komponent. Forfarandesteget s450 kan inbegripa steget att med Naha av ett overtryck ISta namnda referensgas floda p6 lampligt sat has namnda sensor 235, 245, 255, 265 under en viss forutbestamd tid, t ex 2 minuter. The process step s450 may include the step of exposing said sensor 235, 245, 255, 265 to a second reference gas. Said second reference gas has a cand content Ref 2 Nox, Ref 2 Ox of one component. The process step s450 may comprise the step of floating with said Na of an overpressure ISta said reference gas p6 aptly set has the said sensor 235, 245, 255, 265 for a certain predetermined time, for example 2 minutes.

Denna tid valjs for att sakerstalla att sensorn omges helt av namnda referensgas. This time is selected to ensure that the sensor is completely surrounded by said reference gas.

Efter forfarandesteget s450 utfors ett efterfaljande forfarandesteg s460. After the step step s450, a subsequent step step s460 is performed.

Forfarandesteget s460 kan inbegripa steget att med hjalp av sensorn 235, 245, 255, 265 faststalla en halt HmeasNox, HmeasOx av namnda komponent hos namnda andra referensgas. The process step s460 may comprise the step of determining with the aid of the sensor 235, 245, 255, 265 a content of HmeasNox, HmeasOx of said component of said second reference gas.

Efter forfarandesteget s460 utfors ett efterfoljande forfarandesteg s470. After the procedure step s460, a subsequent procedure step s470 is performed.

Forfarandesteget s470 kan inbegripa steget att jamfara den faststallda halten HmeasNox, HmeasOx med den kanda halten Ref 2 Nox, Ref 2 Ox hos namnda andra referensgas avseende namnda komponent. Jamforelsen kan utforas av exempelvis den forsta styrenheten 200 eller av namnda kommunikationsenhet 285. DS den fastst5lIda halten HmeasNox, HmeasOx befinner sig inom ett visst forutbestamt 31 537 121 intervall som omger den kanda halten Ref 2 Nox, Ref 2 Ox av namnda komponent kan det konstateras att sensorn Sr korrekt. DS den faststallda halten befinner sig utom ett visst forutbestamt intervall som omger den kanda halten av namnda komponent kan det konstateras att sensorn Sr defekt. The process step s470 may include the step of comparing the determined content HmeasNox, HmeasOx with the known content Ref 2 Nox, Ref 2 Ox of said second reference gas with respect to said component. The comparison can be performed by, for example, the first control unit 200 or by the said communication unit 285. DS the determined content HmeasNox, HmeasOx is within a certain predetermined 31 537 121 range which surrounds the known content Ref 2 Nox, Ref 2 Ox of said component it can be stated that the sensor is correct. DS the determined content is outside a certain predetermined range which surrounds the known content of said component, it can be stated that the sensor Sr is defective.

Det bar papekas att den faststallda halten HmeasNox had janitors med den kanda halten Ref 1 Nox respektive Ref 2 Nox. Det bor papekas att den faststallda halten HmeasOx hari jamfors med den kanda halten Ref 1 Ox respektive Ref 2 Ox. It was stated that the fixed content HmeasNox had janitors with the known content Ref 1 Nox and Ref 2 Nox respectively. It should be noted that the fixed content HmeasOx is compared with the known content Ref 1 Ox and Ref 2 Ox, respectively.

Efter forfarandesteget s470 avslutas forfarandet. After procedure step s470, the procedure is terminated.

Med hanvisning till Figur 5, visas ett diagram av ett utforande av en anordning 500. Styrenheterna 200 och 210 som beskrivs med hanvisning till exempelvis Figur 2a 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, sS som ett operativsystem, Sr lagrat far att styra funktionen hos anordningen 500. Vidare innefattar anordningen 500 en buss-controller, en seriell kommunikationsport, I/O-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. Referring to Figure 5, a diagram is shown of an embodiment of a device 500. The controllers 200 and 210 described with reference to, for example, Figure 2a 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, sS as an operating system, Sr stored to control the operation of the device 500. Further, the device 500 comprises a bus 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 tillhandahSlles ett datorprogram P som kan innefatta rutiner for att avgara funktion hos en sensor anordnad att faststalla halt hos en komponent hos avgaser 25 fran en motor. A computer program P is provided which may include routines for discharging function of a sensor arranged to determine the content of a component of exhaust gases from an engine.

Datorprogrammet P kan innefatta rutiner for att styra exponering namnda sensor 235, 245, 255, 265 for en referensgas, annan an namnda avgaser, med en kand halt av namnda komponent. Datorprogrammet P kan innefatta rutiner for att faststalla en halt av namnda komponent hos namnda referensgas medelst namnda sensor 32 537 121 235, 245, 255, 265. Datorprogrammet P kan innefatta rutiner for att jamfora den salunda faststallda halten med namnda kanda halt avseende namnda komponent. Datorprogrammet P kan innefatta rutiner for att och bedOma namnda funktion p5 basis av resultatet av namnda jamforelse. The computer program P may comprise routines for controlling exposure of said sensor 235, 245, 255, 265 to a reference gas, other than said exhaust gases, with a known content of said component. The computer program P may comprise routines for determining a content of said component of said reference gas by means of said sensor 32 537 121 235, 245, 255, 265. The computer program P may comprise routines for comparing the thus determined content with said known content with respect to said component. The computer program P may comprise routines for and judging said function p5 on the basis of the result of said comparison.

Datorprogrammet P kan innefatta rutiner for att avgara funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor 206, varvid namnda sensor 5r en NOx-sensor eller en Lambda-sensor. The computer program P may comprise routines for discharging the function of a sensor arranged to determine the content of a component of exhaust gases from an engine 206, said sensor 5 being a NOx sensor or a Lambda sensor.

Datorprogrammet P kan innefatta rutiner for att styra exponering av namnda sensor 235, 245, 255, 265 for en fOrsta referensgas med en kand halt av namnda komponent. Datorprogrammet P kan innefatta rutiner for att styra exponering av namnda sensor 235, 245, 255, 265 for atminstone en ytterligare referensgas, dar namnda ytterligare referensgas har en halt av namnda komponent som skiljer sig frail halten i namnda fOrsta referensgas. The computer program P may include routines for controlling exposure of said sensor 235, 245, 255, 265 to a first reference gas with a candle content of said component. The computer program P may comprise routines for controlling exposure of said sensor 235, 245, 255, 265 to at least one further reference gas, wherein said additional reference gas has a content of said component which differs from the content of said first reference gas.

Datorprogrammet P kan innefatta rutiner for att styra exponering av namnda sensor 235, 245, 255, 265 for en fOrsta referensgas med en kand halt av namnda komponent. Datorprogrammet P kan innefatta rutiner for att styra exponering av namnda sensor for 5tminstone en ytterligare referensgas, dar namnda ytterligare referensgas har en halt av namnda komponent som skiljer sig fran halten i namnda fOrsta referensgas varvid namnda, inbordes olika, kanda halter valjs for tackande av sensorns 235, 245, 255, 265 matregister. The computer program P may include routines for controlling exposure of said sensor 235, 245, 255, 265 to a first reference gas with a candle content of said component. The computer program P may comprise routines for controlling exposure of said sensor to at least one additional reference gas, wherein said additional reference gas has a content of said component which differs from the content of said first reference gas, said different embedded contents being selected to thank the sensor. 235, 245, 255, 265 food registers.

Datorprogrammet P kan innefatta rutiner for att vid avgdrandet av namnda funktion hos en sensor 235, 245, 255, 265 anordnad att faststalla halt av en komponent hos avgaser fr5n en motor 206, beakta signaler fr5n namnda sensor som är bibeh5llet signalansluten till exempelvis den fOrsta styrenheten p5 samma satt som vid sensorns 235, 245, 255, 265 gangse anvandning. 33 537 121 Datorprogrammet P kan innefatta rutiner for att vid avgorandet av namnda funktion hos en sensor 235, 245, 255, 265 anordnad att faststalla halt av en komponent hos avgaser frail en motor 206, varvid namnda exponering av referensgas utfors med namnda sensor 235, 245, 255, 265 anordnad p5 sin gangse plats hos avgaskanalen 290 eller anordnad externt namnda avgaskanal 290. The computer program P may comprise routines for taking into account signals from said sensor which are maintained in a signal connected to, for example, the first control unit when determining said function of a sensor 235, 245, 255, 265 arranged to determine the content of a component of exhaust gases from an engine 206. p5 was the same as with the sensor 235, 245, 255, 265 once used. The computer program P may comprise routines for in determining said function of a sensor 235, 245, 255, 265 arranged to determine the content of a component of exhaust gases from an engine 206, said exposure of reference gas being performed with said sensor 235, 245, 255, 265 arranged in their usual place at the exhaust duct 290 or arranged externally named exhaust duct 290.

Datorprogrammet P kan innefatta rutiner for att vid avgarandet av namnda funktion hos en sensor 235, 245, 255, 265 anordnad att faststalla halt av en komponent hos avgaser fra'n en motor 206, varvid en referensgas utgors av luft. The computer program P may comprise routines for in the event of the said function of a sensor 235, 245, 255, 265 being arranged to determine the content of a component of exhaust gases from an engine 206, a reference gas being constituted by air.

Programmet P kan vara lagrat p5 ett exekverbart vis eller p5 komprimerat vis i ett minne 560 och/eller i ett las/skrivminne 550. The program P can be stored p5 in an executable mode or p5 compressed mode in a memory 560 and / or in a read / write memory 550.

Nar det Jr beskrivet att databehandlingsenheten 510 utfor en viss funktion ska det fOrstas att databehandlingsenheten 510 utfor en viss del av programmet vilket Jr lagrat i minnet 560, eller en viss del av programmet som är 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 Jr 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 Jr anordnat att kommunicera med databehandlingsenheten 510 via en databuss 514. Till dataporten 599 kan t.ex. lankarna L210, L230, L250, L255, L265, L280 och L285 anslutas (se Figur 2a). 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 Jr arranged to communicate with the data processing unit 510 via a data bus 514. To the data port 599, e.g. the lanes L210, L230, L250, L255, L265, L280 and L285 are connected (see Figure 2a).

Nar data mottages p5 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 p5 ett vis 30 som beskrivits ovan. Enligt ett utforande innefattar signaler mottagna p 34 537 121 dataporten 599 information om NOx-halt faststallda med respektive NOx-sensor 255, 265. Enligt ett utforande innefattar signaler mottagna pa dataporten 599 information om syrehalt faststallda med respektive Lambda-sensor 255, 265. When data is received at the data port 599, it is temporarily stored in the second memory portion 540. Once the received input has been temporarily stored, the data processing unit 510 is ready to perform execution of code p5 in a manner described above. According to one embodiment, signals received on the data port 599 include data on NOx content determined by the respective NOx sensor 255, 265. According to one embodiment, signals received on the data port 599 include information on oxygen content determined by the respective Lambda sensor 255, 265.

De mottagna signalerna pa dataporten 599 kan anyandas av anordningen 500 fOr att avgora funktion hos en sensor anordnad att faststalla halt av en komponent hos avgaser fran en motor. Delar av metoderna beskrivna had kan utforas av anordningen 500 med hjalp av databehandlingsenheten 510 som Icor programmet lagrat i minnet 560 eller lasiskriyminnet 550. Nar anordningen 500 kik programmet, exekveras hari beskrivna forfaranden. The received signals on the data port 599 may be used by the device 500 to determine the function of a sensor arranged to determine the content of a component of exhaust gases from an engine. Parts of the methods described may be performed by the device 500 by means of the data processing unit 510 which the Icor program stored in the memory 560 or the laser disk memory 550. When the device 500 looks at the 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 uttommande 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 är 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 make the first invention for different embodiments and with the various modifications which are appropriate to the intended use.

Claims (16)

537 121 PATENTKRAV 1. Forfarande for att avgora funktion hos en sensor (235; 245; 255; 265) anordnad att faststalla halt av en komponent hos avgaser fr5n en motor (206), kannetecknat av stegen att: - exponera (s420; s450) namnda sensor (235; 245; 255; 265) for en referensgas, annan an namnda avgaser, med en kand halt (Ref 1 NOx; Ref 1 Ox) av namnda komponent;A method for determining the function of a sensor (235; 245; 255; 265) arranged to determine the content of a component of exhaust gases from an engine (206), characterized by the steps of: - exposing (s420; s450) said sensor (235; 245; 255; 265) for a reference gas, other than said exhaust gas, having a candle content (Ref 1 NOx; Ref 1 Ox) of said component; 1. faststalla (s430; s460) en halt (HmeasN0x; Hmeas0x) av namnda komponent hos namnda referensgas medelst namnda sensor (235; 245; 255; 265); 2. jamfora (s440; s470) den salunda faststallda halten (HmeasNox; Hmeas0x) med namnda kanda halt (Ref 1 NOx; Ref 1 Ox) avseende namnda komponent; och 3. bedoma namnda funktion pa basis av resultatet av namnda jamforelse.Determining (s430; s460) a content (HmeasN0x; Hmeas0x) of said component of said reference gas by means of said sensor (235; 245; 255; 265); 2. compare (s440; s470) the thus determined content (HmeasNox; Hmeas0x) with said kanda content (Ref 1 NOx; Ref 1 Ox) with respect to said component; and 3. assessing said function on the basis of the result of said comparison. 2. Forfarande enligt krav 1, varvid namnda sensor är en NOx-sensor eller en Lambda-sensor.The method of claim 1, wherein said sensor is a NOx sensor or a Lambda sensor. 3. Forfarande enligt n5got av krav 1-2, innefattande steget att: - efter steget att exponera (s420) namnda sensor (235; 245; 255; 265) for en forsta referensgas med en kand halt (Ref 1 NOx; Ref 1 Ox) av namnda komponent, 1. exponera (s450) namnda sensor for 5tminstone en ytterligare referensgas, dar namnda ytterligare referensgas har en kand halt (Ref 2 NOx; Ref 2 Ox) av namnda komponent som skiljer sig fra'n halten (Ref 1 NOx; Ref 1 Ox) i namnda forsta referensgas.A method according to any one of claims 1-2, comprising the step of: - after the step of exposing (s420) said sensor (235; 245; 255; 265) for a first reference gas with a cand content (Ref 1 NOx; Ref 1 Ox ) of said component, 1. expose (s450) said sensor to at least one additional reference gas, where said additional reference gas has a known content (Ref 2 NOx; Ref 2 Ox) of said component which differs from the content (Ref 1 NOx ; Ref 1 Ox) in the said first reference gas. 4. Forfarande enligt krav 3, varvid namnda, inbordes olika, kanda halter valjs for tackande av sensorns matregister. 36 537 121A method according to claim 3, wherein said, inboard different, known contents are selected for filling the sensor food register. 36 537 121 5. Forfarande enligt nagot av krav 1-4, innefattande steget att: 1. bibeh51Ia namnda sensor (235; 245; 255; 265) signalansluten till ett styrsystem (200; 210) hos namnda motor (206) p5 samma satt som vid sensorns (235; 245; 255; 265) gangse anvandning.A method according to any one of claims 1-4, comprising the step of: 1. maintaining said sensor (235; 245; 255; 265) connected to a control system (200; 210) of said motor (206) in the same manner as in the sensor (235; 245; 255; 265) common use. 6. Forfarande enligt nagot av krav 1-5, varvid namnda exponering utfors med namnda sensor (235; 245; 255; 265) anordnad p5 sin gangse plats hos avgaskanalen (290) eller anordnad externt namnda avgaskanal (290).A method according to any one of claims 1-5, wherein said exposure is performed with said sensor (235; 245; 255; 265) arranged p5 its usual location at the exhaust duct (290) or arranged externally said exhaust duct (290). 7. Forfarande enligt n5got av krav 1-6, varvid en referensgas utgors av luft.A method according to any one of claims 1-6, wherein a reference gas is air. 8. Anordning for att avgora funktion hos en sensor (235; 245; 255; 265) anordnad att faststalla halt av en komponent hos avgaser fr5n en motor (206), innefattande: en sensor (235; 245; 255; 265) anordnad hos en avgaskanal (290) anordnad att detektera namnda halt av en komponent hos en referensgas, annan an namnda avgaser, med en kand halt (Ref 1 NOx; Ref 1 Ox) av namnda komponent; 1. organ (200; 210; 500) anpassade att faststalla en halt (HmeasNox; Hmeas0x) av namnda komponent hos namnda referensgas medelst namnda sensor; 2. organ (200; 210; 500) anpassade att jamfora den salunda faststallda halten (HmeasNox; Hmeas0x) med namnda kanda halt (Ref 1 NOx; Ref 1 Ox) avseende namnda komponent; och - organ (200; 210; 500) anpassade att bedorna namnda funktion p5 basis av resultatet av namnda jamforelse.An apparatus for determining the function of a sensor (235; 245; 255; 265) arranged to determine the content of a component of exhaust gases from an engine (206), comprising: a sensor (235; 245; 255; 265) arranged at an exhaust duct (290) arranged to detect said content of a component of a reference gas, other than said exhaust gases, with a candidate content (Ref 1 NOx; Ref 1 Ox) of said component; Means (200; 210; 500) adapted to determine a content (HmeasNox; HmeasOx) of said component of said reference gas by means of said sensor; Means (200; 210; 500) adapted to compare the salinity determined content (HmeasNox; Hmeas0x) with said kanda content (Ref 1 NOx; Ref 1 Ox) with respect to said component; and - means (200; 210; 500) adapted to perform said function on the basis of the result of said comparison. 9. Anordning enligt krav 8, varvid namnda sensor är en NOx-sensor eller en Lambda-sensor. 37 537 121The device of claim 8, wherein said sensor is a NOx sensor or a Lambda sensor. 37 537 121 10. Anordning enligt nagot av krav 8-9, innefattande: 1. organ (275) anpassade att exponera namnda sensor for 5tminstone tv5 referensgaser med inbordes olika kanda halter (Ref 1 NOx, Ref 2 NOx; Ref 1 Ox, Ref 2 Ox) av namnda komponent for bedomning av namnda funktion.Device according to any one of claims 8-9, comprising: 1. means (275) adapted to expose said sensor to at least two reference gases with different known contents in ref (Ref 1 NOx, Ref 2 NOx; Ref 1 Ox, Ref 2 Ox) of said component for judging said function. 11. Anordning enligt nagot av krav 8-10, innefattande: 1. organ (295) anpassade att lostagbart halla namnda sensor (235; 245; 255; 265), varvid namnda organ (295) är lostagbart fast hos namnda avgaskanal (290).A device according to any one of claims 8-10, comprising: 1. means (295) adapted to releasably hold said sensor (235; 245; 255; 265), said means (295) being releasably fixed to said exhaust duct (290) . 12. Anordning enligt krav 11, varvid namnda organ (295) är lostagbart tatbart fast i en oppning avsedd for namnda sensor (235; 245; 255; 265) i namnda avgaskanal (290).The device of claim 11, wherein said means (295) is releasably tangible fixed in an opening provided for said sensor (235; 245; 255; 265) in said exhaust duct (290). 13. Motorfordon (100; 110) innefattande en anordning enligt n5got av kraven 8-12.A motor vehicle (100; 110) comprising a device according to any one of claims 8-12. 14. Motorfordon (100; 110) enligt krav 13, varvid motorfordonet är n5got av en lastbil, buss eller personbil.A motor vehicle (100; 110) according to claim 13, wherein the motor vehicle is any of a truck, bus or passenger car. 15. Datorprogram (P) att avgora funktion hos en sensor (235; 245; 255; 265) anordnad att faststalla halt av en komponent hos avgaser fran en motor (206), dar namnda datorprogram (P) innefattar programkod for att orsaka en elektronisk styrenhet (200; 500) eller en annan dator (210; 500) ansluten till den elektroniska styrenheten (200; 500) att utfora stegen enligt nagot av patentkraven 1-7.A computer program (P) for determining the function of a sensor (235; 245; 255; 265) arranged to determine the content of a component of exhaust gases from an engine (206), wherein said computer program (P) comprises program code for causing an electronic control unit (200; 500) or another computer (210; 500) connected to the electronic control unit (200; 500) for performing the steps of any of claims 1-7. 16. Datorprogramprodukt innefattande en programkod lagrad p5 ett, av en dator lasbart, medium for att utfora forfarandestegen enligt nAgot av patentkraven 1-7, nar namnda programkod !cars pa en elektronisk styrenhet 38 537 121 (200; 500) eller en annan dator (210; 500) ansluten till den elektroniska styrenheten (200; 500). 39 537 121 1/6 100 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 cars on an electronic control unit 38 537 121 (200; 500) or another computer ( 210; 500) connected to the electronic control unit (200; 500). 39 537 121 1/6 100 112
SE1350621A 2013-05-22 2013-05-22 Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine SE537121C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE1350621A SE537121C2 (en) 2013-05-22 2013-05-22 Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine
DE112014002182.2T DE112014002182T5 (en) 2013-05-22 2014-05-16 Device and method for determining the function of a sensor
PCT/SE2014/050598 WO2014189441A1 (en) 2013-05-22 2014-05-16 Device and method for determining the function of an engine exhaust gas sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1350621A SE537121C2 (en) 2013-05-22 2013-05-22 Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine

Publications (2)

Publication Number Publication Date
SE1350621A1 SE1350621A1 (en) 2014-11-23
SE537121C2 true SE537121C2 (en) 2015-01-27

Family

ID=51933862

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1350621A SE537121C2 (en) 2013-05-22 2013-05-22 Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine

Country Status (3)

Country Link
DE (1) DE112014002182T5 (en)
SE (1) SE537121C2 (en)
WO (1) WO2014189441A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016212349A1 (en) * 2016-07-06 2017-08-24 Continental Automotive Gmbh Method for operating an oxygen sensor and oxygen sensor for determining an oxygen concentration in an intake tract

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878709B1 (en) * 1997-03-21 2004-08-25 NGK Spark Plug Co. Ltd. Method and apparatus for measuring NOx gas concentration
DE19842425C2 (en) * 1998-09-16 2003-10-02 Siemens Ag Method for correcting the characteristic of a linear lambda probe
DE102008046121A1 (en) * 2008-09-05 2010-03-11 Deutz Ag Method for calibrating a NOx / lambda sensor
JP4692911B2 (en) * 2008-09-18 2011-06-01 トヨタ自動車株式会社 NOx sensor output calibration apparatus and output calibration method
DE102009046777A1 (en) * 2009-11-17 2011-05-19 Robert Bosch Gmbh Method for calibration of e.g. nitrogen oxide sensor utilized in exhaust tract of internal-combustion engine of new vehicle, involves executing calibration and heating of sensor by measuring oxygen concentration in air in exhaust tract
DE102010063095A1 (en) * 2010-12-15 2012-06-21 Robert Bosch Gmbh Method and apparatus for performing a zero point adaptation of a lambda probe of an internal combustion engine

Also Published As

Publication number Publication date
WO2014189441A1 (en) 2014-11-27
DE112014002182T5 (en) 2016-01-07
SE1350621A1 (en) 2014-11-23

Similar Documents

Publication Publication Date Title
US6941746B2 (en) Mobile diesel selective catalytic reduction systems and methods
SE537121C2 (en) Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine
RU2560114C1 (en) Method related with scr-system and scr-system (scr stands for selective catalytic reduction)
WO2016028217A1 (en) System and method to diagnosing a sensor of an exhaust gas after treatment system
SE1251035A1 (en) SCR system and procedure of an SCR system
SE1450858A1 (en) System and method for performance control of a DOC unit exhaust gas purification system
SE537270C2 (en) Device and method for detecting defective NOx sensors
US11307102B2 (en) System and a method for determining a correct or incorrect position of a temperature sensor of an emission control system
SE1350273A1 (en) Apparatus and method for selecting the maximum reducing agent dosage in an SCR system for exhaust gas purification
SE1250771A1 (en) SCR system and procedure for cleaning exhaust gases in an SCR system
CN105784402A (en) Liquified natural gas (LNG) storage tank gas supply performance experiment device and method
EP2699776B1 (en) Method and device for determining the dosed reducing agent volume in an scr system
CN113935698A (en) Commercial concrete vehicle monitoring method, controller and system
CN102465743A (en) Diesel-exhaust-fluid refill detection
SE1450080A1 (en) Device and method of an exhaust gas purification system
KR101810621B1 (en) Device and method for fault-tracing pertaining to an scr system
US11852622B2 (en) Methods for avoiding improper mixing of additives in a refueling storage tank and devices therefor
US20210095983A1 (en) Method and system for reducing the environmental pollution due to a transport route
SE1450082A1 (en) A system and method for determining the presence of fuel in an exhaust gas purification system
WO2023055372A1 (en) Methods for avoiding improper mixing of additives in a refueling storage tank and devices therefor
KR20160115364A (en) Device and method for checking urea of SCR system
SE1450859A1 (en) Method and system for determining cleaning needs for a particle filter
SE1150863A1 (en) Method of an HC dosing system and an HC dosing system
KR20180075167A (en) Recording device for Urea dosing of selective catalytic reduction system
SE537652C2 (en) Liquid sample sampling unit, preferably for a fuel, where the unit is adapted to be mounted in a system of pressure variations