WO2020187879A1 - Procédé pour déterminer un défaut d'un capteur de gaz d'échappement d'un moteur à combustion interne - Google Patents

Procédé pour déterminer un défaut d'un capteur de gaz d'échappement d'un moteur à combustion interne Download PDF

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Publication number
WO2020187879A1
WO2020187879A1 PCT/EP2020/057209 EP2020057209W WO2020187879A1 WO 2020187879 A1 WO2020187879 A1 WO 2020187879A1 EP 2020057209 W EP2020057209 W EP 2020057209W WO 2020187879 A1 WO2020187879 A1 WO 2020187879A1
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WIPO (PCT)
Prior art keywords
pump
electrode
exhaust gas
gas sensor
cavity
Prior art date
Application number
PCT/EP2020/057209
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German (de)
English (en)
Inventor
Tim Walde
Original Assignee
Vitesco Technologies GmbH
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Filing date
Publication date
Application filed by Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of WO2020187879A1 publication Critical patent/WO2020187879A1/fr

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02D2041/1468—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 ammonia content or concentration of the exhaust gases
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method for determining a fault in an exhaust gas sensor of an internal combustion engine, in particular a method for
  • Exhaust sensors such as B. nitrogen oxide sensors allow a measurement of the
  • the components of the exhaust gas from the internal combustion engine include Ammonia (NFI3) and nitrogen oxides (NOx), knowledge of the respective concentration can be advantageous for controlling the internal combustion engine.
  • NFI3 Ammonia
  • NOx nitrogen oxides
  • DE 10 2007 035 768 A1 discloses a method for diagnosing an engine that is arranged in an exhaust system of an internal combustion engine
  • Nitrogen oxide sensor the at least one setting device for setting the oxygen content of exhaust gas that has entered the sensor by means of a
  • DE 697 32 582 T2 discloses a method and a device for measuring the oxygen concentration and the nitrogen oxide concentration
  • DE 103 12 732 B4 discloses a method for operating a measuring probe for measuring a gas concentration in a measuring gas with a
  • Oxygen ion-conducting solid electrolyte which has a measuring cavity for receiving the measuring gas, a measuring electrode and an outer electrode.
  • a pump current flowing between the measuring electrode and the outer electrode is transported Oxygen ions from the measuring electrode to the outer electrode. This is a check of the measuring electrode by a determination of the effective for the
  • Oxygen diffusion available electrode area or a value dependent on it is carried out by setting a predetermined oxygen concentration in the measuring cavity, impressing a predetermined constant pump current between the measuring electrode and the outer electrode and measuring the resulting Nernst potential at the measuring electrode, the time until the measured Nernst potential is measured jumps from small to large values, the measured time period is compared with a predetermined threshold value and a defect in the measuring electrode is detected when the measured time period falls below the predetermined threshold value.
  • WO 2017/222001 A1, WO 2017/222002 A1 and WO 2017/222003 A1 each disclose nitrogen oxide sensors that are provided with a pre-cavity in which a pre-electrode is provided. By controlling the pump electrode and the pre-electrode, the ammonia content in the exhaust gas can be qualitatively determined
  • the present invention is based on the idea of an error in a device designed to measure the concentration of nitrogen oxide and ammonia
  • Pump currents or oxygen signals of the exhaust gas sensor essentially correspond to a predetermined ratio value in the case of a fault-free exhaust gas sensor and a predetermined ratio value in the case of a faulty exhaust gas sensor Ratio value differ by more than a predetermined threshold value.
  • the pump electrodes have aged differently or that at least one of the pump electrodes has aged excessively.
  • the pumping currents or oxygen signals of a single exhaust gas sensor are compared with one another, the removal of the exhaust gas from the exhaust gas line being the
  • a method for determining a fault in an exhaust gas sensor having a main body and arranged in an exhaust system of an internal combustion engine is disclosed, the first being arranged in the main body and connected to the exhaust gas
  • the exhaust gas sensor is a single exhaust gas sensor in which the first pump cavity and the second
  • the method according to the invention includes controlling one of the first
  • Electrode voltage is kept constant at a predetermined first voltage value, controlling a second pump current applied to the second pump electrode in such a way that a second electrode voltage forming between the second pump electrode and the reference electrode is at a
  • predetermined second voltage value is kept constant and determine a a failure of the exhaust gas sensor based on a comparison of the first
  • the exhaust gas removed by the exhaust gas sensor has in the two measurement paths in
  • the exhaust gas sensor is an exhaust gas sensor that is sensitive to nitrogen oxide and ammonia and is based on the amperometric measuring principle.
  • the error of the determined by the method according to the invention is an exhaust gas sensor that is sensitive to nitrogen oxide and ammonia and is based on the amperometric measuring principle.
  • Another fault in the exhaust gas sensor can also be a mechanical defect in the flake body, such as B. a flaar crack in the flake body, which leads to uncontrolled diffusion within the exhaust gas sensor and in the flake body.
  • the method according to the invention preferably also includes determining a pump current ratio between the first pump current and the second pump current, an error in the exhaust gas sensor being determined if the determined pump current ratio deviates from a predetermined pump current ratio value by more than a ratio threshold value.
  • An alternative embodiment of the method according to the invention further comprises determining a pump current difference between the first pump current and the second pump current, an error in the exhaust gas sensor being determined when the determined pumping current difference from a predetermined one
  • the predetermined ratio threshold or the predetermined difference threshold is approximately 50%, preferably approximately 30%, more preferably approximately 15%. That is, if that determined
  • the method according to the invention preferably further comprises outputting a warning to the operator of the internal combustion engine if an error occurs in the
  • Exhaust gas sensor has been determined.
  • this warning can be an indication for the operator of the internal combustion engine that the exhaust gas sensor should be exchanged or replaced with a new exhaust gas sensor during the next maintenance.
  • a method for operating an exhaust gas sensor arranged in an exhaust line of an internal combustion engine comprises determining a fault in the exhaust gas sensor according to the first aspect and, if a fault in the exhaust gas sensor has been determined, controlling the first pump current and / or the second pump current in such a way that the first electrode voltage and / or the second electrode voltage a predetermined third voltage value and / or predetermined fourth voltage value are kept constant.
  • the third voltage value or fourth voltage value differ from the first
  • the method according to the second aspect of the present invention thus describes an emergency operating method of the exhaust gas sensor when a fault of the same has been determined according to the first aspect.
  • the emergency operation method by means of the emergency operation method, the time span from the detection of the error to a Maintenance of the internal combustion engine can be bridged and nitrogen oxide and ammonia values can thus continue to be recorded, but only as a total value.
  • the third voltage value is smaller than the first voltage value and / or if the fourth voltage value is smaller than the second voltage value.
  • the exhaust gas sensor can be preferred to provide the exhaust gas sensor with operating data for both normal measuring operation and emergency operation during manufacture.
  • FIG. 1 shows a schematic sectional view through an exhaust gas sensor according to an exemplary first embodiment
  • FIG. 2 shows a schematic sectional view through an exhaust gas sensor according to an exemplary second embodiment
  • FIG. 3 shows an exemplary flow chart of a method according to the invention for determining a fault in the exhaust gas sensor of FIG. 1 or FIG. 2.
  • control includes the control-related terms “control” and “regulate”.
  • control includes the control-related terms “control” and “regulate”.
  • FIG. 1 a schematic sectional view through an exhaust gas sensor 100 according to an exemplary first embodiment is shown, which is designed to be arranged in an exhaust line of an internal combustion engine (not shown) and to contain nitrogen oxide, ammonia and / or
  • the exhaust gas sensor 100 has a main body 112 made of a solid electrolyte, which is preferably formed from a mixed crystal of zirconium oxide and yttrium oxide and / or by a mixed crystal of zirconium oxide and calcium oxide.
  • Perovskite-based oxides or a mixed crystal of trivalent metal oxide can be used.
  • the first measuring path 110 has a first cavity 130, a first pump cavity 120 and a first measuring cavity 140.
  • the first cavity 130 is connected to the exterior of the main body 112 via a first connecting path 115.
  • exhaust gas can enter the first cavity 130 through the first connecting path 115.
  • the first pump cavity 120 is connected to the first cavity 130 via a first diffusion path 125.
  • the first diffusion path 125 is provided, for example, in the form of a very thin slit through which the gas mixture can pass at a predetermined rate. Alternatively, the first diffusion path 125 may be filled with a porous filler to form a
  • Diffusion rate regulation layer be filled or padded.
  • the first measuring cavity 140 is connected to the first pump cavity 120 via a second diffusion path 135.
  • the second diffusion path 135 is provided, for example, in the form of a very thin slit through which the gas mixture can pass at a predetermined rate.
  • the second diffusion path 135 may be filled with a porous filler to form a
  • Diffusion rate regulation layer be filled or padded.
  • the Diffusion rate layers can alternatively be referred to as diffusion barriers.
  • the first diffusion path 125 and the second diffusion path 135 are designed such that the gas mixture can only partially pass through them.
  • Diffusion rate through the first and second diffusion path 125, 135 can be determined and established.
  • Measurement path 110 only has the first pump cavity 120 and the first measurement cavity 140, which is connected to the first pump cavity 120 via the second diffusion path 135.
  • the first pump cavity 120 is then connected to the exhaust gas via a connection path which corresponds to the path through the first connection path 115, the first cavity 130 and the first diffusion path 125 of the exhaust gas sensor 100 of FIG. 1.
  • the exhaust gas from the exhaust line can enter the first pump cavity 120 directly through this connecting path.
  • the second measuring path 210 has a second pump cavity 220, a second cavity 230 and a second measuring cavity 240.
  • the second pump cavity 220 is connected to the exterior of the main body 112 via a second connection path 215.
  • exhaust gas can enter the second pump cavity 220 through the second connecting path 215.
  • Connection paths 115 are connected to the exhaust gas in such a way that the exhaust gas can be taken from an almost identical point in the exhaust system of the internal combustion engine. Consequently, the exhaust gas diffusing or flowing through the two measurement paths 110, 120 has almost identical properties or an almost identical composition.
  • the second cavity 230 is connected to the second pump cavity 220 via a third diffusion path 225.
  • the third diffusion path 225 is provided, for example, in the form of a very thin slit through which the gas mixture can pass at a predetermined rate. Alternatively, the third diffusion path 225 may be filled with a porous filler to form a
  • Diffusion rate regulation layer be filled or padded.
  • the second measuring cavity 240 is connected to the second cavity 230 via a fourth diffusion path 235.
  • the fourth diffusion path 235 is provided, for example, in the form of a very thin slit through which the gas mixture can pass at a predetermined rate.
  • the fourth diffusion path 235 may be filled with a porous filler to form a
  • Diffusion rate regulation layer be filled or padded.
  • Diffusion rate layers can alternatively be referred to as diffusion barriers.
  • the third diffusion path 225 and the fourth diffusion path 235 are designed such that the gas mixture can only partially pass through them.
  • Diffusion rate through the third and fourth diffusion path 225, 235 can be determined and set.
  • Measurement path 210 only has the second pump cavity 220 and the second measurement cavity 240, which is connected to the second pump cavity 220 via a diffusion path which corresponds to the path through the third diffusion path 225, the second cavity 230 and the fourth diffusion path 235 of the exhaust gas sensor 100 of FIG. 1 corresponds.
  • the exhaust gas can flow from the second pump cavity 220 through this diffusion path directly into the second
  • a reference cavity 50 is also formed in the main body 112, which is directly connected to the exterior of the main body 12.
  • a reference electrode 52 is arranged in the reference cavity 50.
  • the reference cavity 50 is in contact with the ambient air, i.e. H. does not come into contact with the exhaust gas and is designed to provide an oxygen reference for the im
  • Main body 1 12 of the exhaust gas sensor 100 arranged to form various electrodes.
  • An exhaust gas electrode (also called “P +” electrode) 22 that is in contact with the exhaust gas is arranged on an outside of the main body 112.
  • the oxygen in the exhaust gas can be ionized during a measurement operation of the exhaust gas sensor 100 by applying a reference current to the exhaust gas electrode 22 and diffuse through the main body 112 as oxygen ions to the reference electrode 52 and converted there again into oxygen molecules to form an oxygen reference.
  • a first pump electrode (also called “P -” electrode) 124 is arranged within first pump cavity 120. In particular, during the
  • the oxygen in the exhaust gas is ionized within the first pump cavity 120 and migrates or diffuses through the main body 112 as oxygen ions. Because of the oxygen ions discharged from the first pump cavity 120, a first electrode voltage or first Nernst voltage V0 is indirectly formed between the first pump electrode 124 and the reference electrode 52. More precisely, the first electrode voltage or the first Nernst voltage V0 is formed directly from the residual oxygen still present in the immediate vicinity of the first pump electrode 124.
  • An oxygen concentration in the pump cavity 120 can be set with IR0; depending on the level of the set oxygen concentration, the nitrogen oxides can be reduced or the ammonia oxidized.
  • a first measuring electrode (also called first “M2” electrode) 144 is arranged within first measuring cavity 140, which is designed to measure the oxygen and / or oxygen present within first measuring cavity 140 when a first measuring current IP21 is applied during measuring operation of nitrogen oxide sensor 100 To ionize nitrogen oxides, so that the oxygen ions can migrate through the main body 112. Due to the oxygen ions discharged or pumped out of the first measuring cavity 140, a first one forms between the first measuring electrode 144 and the reference electrode 52
  • Measuring electrode voltage or first measuring Nernst voltage V21 which is kept at a constant value by applying the first measuring current IP21 to the first measuring electrode 144. More precisely, the first is formed
  • the first measurement current IP21 applied is then an indication of the nitrogen oxide content within the exhaust gas.
  • the first pump current IR0 applied to the first pump electrode 124 is controlled in such a way that preferably only the oxygen is ionized, but not the nitrogen oxides.
  • the first pump electrode 124 is designed to pump almost all of the oxygen from the exhaust gas during normal operation of the nitrogen oxide sensor 100, so that almost only nitrogen oxides are still present in the first measuring cavity 140.
  • the first measuring electrode 144 is designed to the
  • the first measurement current IP21 applied to the first measurement electrode 144 is a measure of the nitrogen oxide content in the exhaust gas.
  • a second pump electrode (also called “M0” electrode) 224 is arranged within the second pump cavity 220.
  • the oxygen in the gas mixture can be ionized within the second pump cavity 220 and through the main body 112 as Oxygen ions migrate or get or diffuse.
  • a second electrode voltage or second Nernst voltage V3 is indirectly formed between the second pump electrode 224 and the reference electrode 52. More precisely, the second electrode voltage or the second Nernst voltage V3 is formed directly from the residual oxygen still present in the immediate vicinity of the second pump electrode 224.
  • a second measuring electrode (also called a second “M2” electrode) 244 is arranged within the second measuring cavity 240, which is designed to detect the oxygen and / or oxygen present within the second measuring cavity 240 when a second measuring current IP22 is applied during the measuring operation of the nitrogen oxide sensor 100 To ionize nitrogen oxides, so that the oxygen ions can migrate through the main body 112. Because of the oxygen ions discharged or pumped out of the second measuring cavity 240, a second one forms between the second measuring electrode 244 and the reference electrode 52
  • Measurement electrode voltage or first measurement Nernst voltage V22 which is kept at a constant value by applying the second measurement current IP22 to the second measurement electrode 244. More precisely, the second is formed
  • the first measurement current IP21 applied is then an indication of the nitrogen oxide content within the exhaust gas.
  • the proportion of ammonia in the exhaust gas can then be determined from the applied second measurement current IP22 and the applied first measurement current IP21, in particular since the ammonia in the exhaust gas is present in the two measurement paths 110, 210
  • Oxidation covers different diffusion distances
  • the second pump current IP3 applied to the second pump electrode 224 is set such that only the ammonia and oxygen present in the exhaust gas are preferably ionized.
  • it is provided to control the second pump current IP3 in such a way that the second electrode voltage or the second Nernst voltage V3 is kept constant at a second voltage value, for example 230 mV.
  • the second pump electrode 224 is designed to pump almost all of the oxygen from the exhaust gas during normal operation of the nitrogen oxide sensor 100, so that in the second
  • Measurement cavity 240 is almost exclusively nitrogen oxides.
  • the second measuring electrode 244 is designed to ionize the nitrogen oxides, the second measuring current IP22 applied to the second measuring electrode 244 being a measure for the
  • the diffusion of ammonia and nitrogen oxide takes place in particular due to the concentration gradient between the several cavities.
  • the ammonia present in the exhaust gas can in each case get better from the first cavity 130 into the first pump cavity 120 or from the second pump cavity 120 into the second cavity 230 than the nitrogen oxide present in the exhaust gas.
  • the exhaust gas sensor 100 also has a control unit (not explicitly shown) which is connected to the first pump electrode 124, the exhaust gas electrode 22, the second pump electrode 224, the first measuring electrode 144, the second measuring electrode 244 and the reference electrode 52 and is designed to these electrodes each with the currents IR0, IP3, IP21 and IP22
  • the control unit is thus designed to control the operation of the exhaust gas sensor 100.
  • Gas mixture can be pumped out.
  • a heating device 60 is also arranged, which is designed to the main body 1 12 to a predetermined
  • the heating device 60 can also be controlled and operated by the control unit.
  • FIG. 2 shows a schematic sectional view through an exhaust gas sensor 200 according to an exemplary second embodiment, which extends from
  • Exhaust gas sensor 100 of FIG. 1 differs in that only one measurement path 110 is present, which is from the second pump cavity 220 in which the second
  • Pump electrode 224 is arranged, the first pump cavity 120, in which the first pump electrode 124 is arranged, and the (first) measuring cavity 140, in which the (first) measuring electrode 144 is arranged, is formed.
  • the two measuring paths 110, 210 are implemented in that the two pump electrodes 124, 224 are operated selectively and alternately. This means that in a first operating mode the first pump current IR0 is applied to the first pump electrode 124, the second pump electrode 224 being deactivated and the second pump cavity 220 thus representing the first cavity 130, and in a second operating mode the second pump current IP3 to the second pump electrode 224 is applied, the first
  • FIG. 3 shows an exemplary flow chart of a method according to the invention for determining a fault in exhaust gas sensor 100 in FIG. 1. It should be noted that the method shown in FIG. 3 can also be carried out with the exhaust gas sensor according to FIG. 2, the first and second pump electrodes 124, 224 each being operated selectively and thereby the first and second pump currents IPO, IP3 offset in time and not be determined at the same time. The exemplary method can also take place in parallel (that is to say at the same time) to the normal measuring operation of the exhaust gas sensor 100. Consequently, the normal
  • the method in FIG. 3 starts in step 300 and then arrives at step 310, at which (during normal operation of the exhaust gas sensor 100) the first pump current IPO applied to the first pump electrode 124 is controlled in such a way that the between the first pump electrode 124 and of the reference electrode 52 forming the first electrode voltage V0 on the predetermined first
  • the second pump current IP3 applied to the second pump electrode 224 is controlled such that the second electrode voltage V3 developing between the second pump electrode 224 and the reference electrode 52 is kept constant at the predetermined second voltage value.
  • the determined pumping current ratio is compared in a further step 340 with a predetermined pumping current ratio value.
  • step 340 If it is determined in step 340 that the determined pumping current ratio does not differ from the predetermined pumping current ratio value by more than a predetermined ratio threshold value, the method returns to step 310 and it can be determined that the exhaust gas sensor is operating correctly. If, on the other hand, it is determined in step 340 that this has been determined
  • step 350 Pumping current ratio deviates from the predetermined pumping current ratio value by more than the predetermined ratio threshold value, the method proceeds to step 350 and a fault in the exhaust gas sensor 100 is determined before the method ends in step 360.
  • a fault in the exhaust gas sensor is recognized, for example, when the determined pumping current ratio deviates from the predetermined pumping current ratio by more than 30%, preferably more than 20%, even more preferably more than 10%.
  • the error of the exhaust gas sensor 100 ascertained in step 350 can, for example, indicate a different aging of the pump electrodes 124, 224, which means that the respective oxygen proportions in the exhaust gas thus ascertained can no longer be determined with sufficient accuracy. It can also be preferred that in step 350, that is to say when an error in the exhaust gas sensor 100 has been determined, the operation of the exhaust gas sensor 100 switches to an emergency mode in which the exhaust gas sensor 100 z. B. is operated as a pure nitrogen oxide sensor that is cross-sensitive to ammonia.
  • the nitrogen oxide signal with the ammonia cross-sensitivity is indeed faulty, but this emergency operation can serve to bridge the time span until the exhaust gas sensor 100 is replaced. Consequently, the exhaust gas sensor 100 can thus be operated in the emergency operating mode at least for this period of time without the vehicle coming to a standstill.

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Abstract

L'invention concerne un procédé pour déterminer un défaut d'un capteur de gaz d'échappement (100) agencé sur la ligne d'échappement d'un moteur à combustion interne, comprenant une première cavité de pompage (120) dans laquelle une première électrode de pompage (124) est agencée, une deuxième cavité de pompage (220) dans laquelle une deuxième électrode de pompage (224) est disposée, et une cavité de référence (50) dans laquelle une électrode de référence (52) est agencée. Le procédé selon l'invention comprend les étapes consistant : à commander un premier flux de pompage (IP0) au niveau de la première électrode de pompage (124) de manière qu'une première tension d'électrode (V0) générée entre la première électrode de pompage (124) et l'électrode de référence (52) soit maintenue constante ; à commander un deuxième flux de pompage (IP3) au niveau de la deuxième électrode de pompage (224) de manière qu'une deuxième tension d'électrode (V3) générée entre la deuxième électrode de pompage (224) et l'électrode de référence (52) soit maintenue constante, et à déterminer un défaut du capteur de gaz d'échappement (100) en fonction d'une comparaison entre le premier flux de pompage (IP0) et le deuxième flux de pompage (IP3).
PCT/EP2020/057209 2019-03-19 2020-03-17 Procédé pour déterminer un défaut d'un capteur de gaz d'échappement d'un moteur à combustion interne WO2020187879A1 (fr)

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DE102021212821A1 (de) 2021-11-15 2023-05-17 Vitesco Technologies GmbH Verfahren zum Betreiben eines Abgassensors für eine Brennkraftmaschine und Abgassensor
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