WO2017102709A1 - Procédé, dispositif, système, programme d'ordinateur et produit-programme d'ordinateur pour le diagnostic d'un capteur de potentiel mixte - Google Patents

Procédé, dispositif, système, programme d'ordinateur et produit-programme d'ordinateur pour le diagnostic d'un capteur de potentiel mixte Download PDF

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Publication number
WO2017102709A1
WO2017102709A1 PCT/EP2016/080765 EP2016080765W WO2017102709A1 WO 2017102709 A1 WO2017102709 A1 WO 2017102709A1 EP 2016080765 W EP2016080765 W EP 2016080765W WO 2017102709 A1 WO2017102709 A1 WO 2017102709A1
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WO
WIPO (PCT)
Prior art keywords
mixed potential
potential sensor
gas
mixed
electrode
Prior art date
Application number
PCT/EP2016/080765
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German (de)
English (en)
Inventor
Torsten Reitmeier
Sabrina KOLBECK
Willibald Reitmeier
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2017102709A1 publication Critical patent/WO2017102709A1/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
    • 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
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4073—Composition or fabrication of the solid electrolyte
    • G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen

Definitions

  • the invention relates to a method, an apparatus, a system, a computer program and a computer program product for diagnosis of a mixed potential sensor for a motor driving ⁇ convincing.
  • Mixed potential sensors are characterized by a simple structure and a relatively high sensitivity for the measurement of pollutant components. They generally have a gas sensitive ⁇ first measuring electrode and a second Referenzelekt ⁇ rode between which a mixed potential is determined askerssig ⁇ nal function of the gas to be measured. It is an object on which the invention is based
  • a method for the diagnosis of a mixed potential sensor for a motor vehicle comprises providing the mixed potential sensor with a gas-sensitive first electrode and a referencing second electrode, which are designed to generate a measurement signal in dependence on a gas to be measured as a mixed potential between the first and second electrodes is representative of a gas concentration of the gas to be measured.
  • the method further includes controlling the mixed potential sensor by means of electrical current and thereby ⁇ n ⁇ countries of the mixed potential between the first and second electrodes.
  • the method further comprises determining a gradient of the modified mixing potential and a determining ei ⁇ nes function state of the mixed potential sensor in Depending ⁇ ness of the determined course of the mixed potential.
  • the functional principle of mixed potential sensors is based essentially on ion diffusion of oxygen.
  • the contaminant components ⁇ bind the available oxygen and the resulting voltage difference between the ERS th and second electrode is detected as a mixed potential.
  • the driving of the mixed potential sensor by means of electrical current makes it possible to achieve a slight excess of oxygen in the mixed potential sensor and to pump it specifically toward the electrode or to provide it for detection by the electrode.
  • the supplied oxygen surplus thus represents a con ⁇ trolled disturbance of the mixed potential, the advertising evaluated to determine the functional state of the mixed potential sensor the can.
  • it is by means of predetermined changing the
  • the mixed potential sensor Due to the driving of the mixed potential sensor by means of electrical current, a pumping current is introduced, which leads to a controlled disturbance of the mixing potential between the two electrodes. An oxygen excess is achieved between the electrodes, which causes an oxygen ion transport and a defined change of the mixed potential. If the course of the mixed potential is determined until the specifically introduced disturbance has subsided again, the functional state of the mixed potential sensor can be checked, for example, in comparison with a predetermined and calibrated course of the mixed potential stored on a data memory.
  • the determined functional state of the mixed potential sensor makes it possible, for example, to draw conclusions about the age and activity of one or both electrodes, which may be impaired due to external influences.
  • a sol ⁇ che impairment of the activity of the mixed potential sensor may be, for example, in drifting measurement signals tillspie- rules, leading to a different course of the mixed potential, which for example does not correspond to a calibrated or functional state.
  • the mixed potential representing the potential applied between an aisle and a referencing ⁇ sitiven electrode of Mischpoten- tialsensors.
  • the Ermit ⁇ stuffs the functional state of the mixed potential sensor in Ab ⁇ dependence of the determined course of the specifically modified mixed potential comprises matching the detected course of the mixed potential with predetermined reference values which are repre ⁇ sentative for a given operational state of the mixed potential sensor.
  • the functional state of the mixed potential sensor can be checked by the fact that the variation of the CONTROL lines ⁇ modified mixed potential determined is compared with a predetermined profile which is for example stored in a data memory.
  • the course of the Mischpo- determined tentials can be compared and provide information on a current operating state of the mixing potential sensor, for example, in terms of its shape, sti ⁇ supply and / or its maximum and minimum excursions with a predetermined profile and / or predetermined reference values.
  • Such a functional state of the mixed potential sensor can be used, for example, for various operating points which different torques, temperatures or injection behavior of injectors can be checked and compared with historical data.
  • a match of the determined course of the mixed potential with a predetermined course or with predetermined basic data is determined by means of the method described, and the mixed potential sensor is judged to be reliable and functional within predetermined tolerance ranges.
  • the gas sensi ⁇ tive electrode of the mixed potential sensor is poisoned by, for example maximum deflections of the determined course of the mixed potential with previously calibrated and not Vergif ⁇ ended measurement signals of the mixed potential sensor and / or Verläu- fen of the mixed potential are compared.
  • the term "poisoned” in this context refers to a reversible or irreversible poisoning of various substances which deposit on or in one or both electrodes and adversely affect their activity.
  • the Ansteu ⁇ ern the mixed potential sensor by means of electrical current comprises a driving means of an isolated current source, which is formed ⁇ , to provide a timed current waveform for driving the mixed potential sensor.
  • the mixed potential sensor has more than two electrodes, so that, for example, a referencing Electrode and a plurality of gas-sensitive electrodes are part of the mixed ⁇ potential sensor, the gas-sensitive electrodes are sensitive, for example, for different gases or gas mixtures.
  • the power source is usefully connected to the electrodes so that a desired pumping current can be introduced between one of the measuring electrodes and the reference electrode. In this way, the electrodes can be individually controlled and checked for the reliability of the measurement signals.
  • the predefined activation by means of the current source comprises, for example, different current levels, amplitudes and times and, inter alia, makes it possible to determine a response time and an activity of the individual electrodes or the respective electrode pair.
  • the power source may Wech ⁇ selstrom or DC power supply as the pumping power for the mixed potential sensor.
  • the frequency of the driving electrical current can be variable and also the pulse shape of the provided current waveform can vary. For example, the current-addressing the course of a kon ⁇ constants curve or a sine, square, triangular or otherwise pulsed form.
  • the polarity of the current source can be bidirectionally adjustable, so that using different current waveforms and by changing the polarity of the current curve conclusions about both the activity of the complete mixed potential sensor and its subareas, such as electrodes, gas transfer, oxidation and electrode material state, activity of the three-phase boundary ⁇ layer and aging of the ionic conductor are possible and provide information on the functional state of the mixed potential sensor.
  • the Ermit ⁇ stuffs the functional state of the mixed potential sensor comprises an ER mittein an electrode and / or functionality of the material mixed potential sensor.
  • the Ermit ⁇ stuffs the functional state of the mixed potential sensor comprises a He ⁇ means of an electrode-gas transition of Mischpotentialsen ⁇ sors.
  • the Ermit ⁇ stuffs the functional state of the mixed potential sensor comprises a He ⁇ convey a type of a three-phase boundary layer of the mixed potential sensor.
  • the electrode-gas transition and the activity of the three-phase boundary layer are two parameters that can decisively influence the functionality of the mixed potential sensor.
  • the electrode-gas transition essentially denotes the interface between the respective electrode surface and the surrounding gas.
  • a reliable determination of gas concentrations using the mixed potential sensor to ermögli ⁇ chen, the gas to be detected may not be prevented from reaching the electrode surface. This would crizspiels- be the case if the mixed potential sensor has a silicon poisoning and the electrode surface is wetted with Silizi ⁇ dioxide, which would block a detection of the measured Ga ⁇ ses.
  • the three-phase boundary layer denotes an area of the
  • the Mixed potential sensor in which the gas to be measured, the Elekt ⁇ rode and a zirconia grid co-operate and co-determine the func- tion state of the mixed potential sensor.
  • the Akti ⁇ tivity of the three-phase boundary layer decides on the kinetics of oxygen deposits, which are incorporated as oxygen molecules in the zirconia lattice of the mixed potential sensor and are dissolved out of this. It has a significant effect on properties such as the signal level of the measurement signals and the response time of the mixed potential sensor.
  • an apparatus for diagnosing a mixed potential sensor for a motor driving ⁇ generating is adapted to perform one of the methods described above, and the mixed potential sensor having a gas sensitive first electrode and a referencing second electrode, which are adapted in Depending ⁇ ability of a gas to be measured to generate a measurement signal, which is representative of a mixed potential for a Gaskonzent ⁇ ration of the gas to be measured.
  • the system comprises an insulated Stromquel ⁇ le, which is designed for electrically driving the mixed potential sensor.
  • the invention features a computer program for diagnosing a mixed potential ⁇ sensor for a motor vehicle, which is designed to perform one of the methods described above when executed on a data processing apparatus.
  • the invention is characterized by a computer program product comprising executable program code, wherein the program code, when executed by a data processing device, is one of the previously described methods for the diagnosis of the mixed potential sensor performs.
  • the computer program product comprises a medium which can be read by the data processing device and on which the program code is stored.
  • FIG. 1 shows an embodiment of a motor vehicle with a device for diagnosing a Mischpotenti ⁇ alsensors
  • FIG. 3 shows a flow chart for a method for the diagnosis of a mixed potential sensor for a motor vehicle.
  • Figure 1 shows an embodiment of a system for Diag ⁇ nose of a mixed potential sensor 5 which is arranged in an exhaust gas tract 7 of a motor vehicle.
  • a Vorrich ⁇ device 1 is adapted to selectively control the mixed potential sensor 5 by means of an isolated current ⁇ source 11 and thereby to enable a determination of a functional state of the mixed potential sensor 5.
  • the mixing ⁇ potential sensor 5 can be checked for an activity and an age and it can be a measuring signals of the mixed potential sensor 5 a certain reliability zugeord ⁇ net.
  • the mixed potential sensor 5 comprises, for example, one or more gas-sensitive electrodes and a referencing electrode, which are designed to generate a measurement signal as a function of a gas to be measured, which as mixed potential between a gas-sensitive electrode and the referencing electrode is representative of a gas concentration of the gas to be measured.
  • the mixed potential Zvi ⁇ rule the two electrodes can be changed by means of driving with electric current, thereby allowing a determination of function egg nes state of the mixed potential sensor 5 in depen ⁇ dependence of the modified mixed potential.
  • the operating principle of the mixed potential sensor 5 is based essentially on ion diffusion of oxygen.
  • the harmful substance components bind the available oxygen and the resulting voltage difference Zvi ⁇ rule of the first and second or the gassensiti ⁇ ven and referencing electrode is detected as a mixed potential.
  • the driving of the mixed potential sensor by means of electrical current makes it possible to achieve a slight excess of oxygen in the mixed potential sensor and to pump it specifically toward the electrodes or to provide it for detection by the electrodes.
  • the oxygen excess provided thus represents a controlled disturbance of the mixed potential, which can be evaluated to determine the functional state of the mixed potential sensor 5.
  • the mixed potential sensor 5 Upon determination of the functional state of the mixed potential sensor 5, the mixed potential sensor 5 is driven, for example, with a predetermined current profile V_ST, thereby introducing in a controlled manner a change in the mixed potential.
  • the predetermined current profile V_ST represents a pump ⁇ stream, which leads to a defined change of the mixed potential between the electrodes due to an induced Sauerstoffüber- shot. If now the course V_MP of the mixed potential is determined until the specifically introduced disturbance has decayed again, the functional state of the mixed potential sensor 5 can be determined, for example, by comparing thus determined course V_MP with a predetermined and calibrated course of the mixed potential.
  • an active diagnosis of the functional state of the mixed potential sensor 5 given the information about the functionality of the mixed potential sensor 5 and the reliability of the measurement ⁇ can deliver signals.
  • the device 1 comprises, for example, a data processing device 9, on which a computer program is executed in order to control the mixed potential sensor 5 by means of electrical current and to influence the mixing potential between the electrodes of the mixed potential sensor 5.
  • Figure 2 shows an example of a current to be driven extending V_ST and a resulting V_MP course of the mixed potential which can be evaluated for the diagnosis of the mixed potential ⁇ sensor 5 and a determination of the functional condition of the mixed potential sensor 5 allows.
  • the mixed potential sensor 5 is thereby operated in voltage mode, the so-called EMF operation.
  • the current waveform shown V_ST which is provided ⁇ by the isolated current source 11, has a function of time t ⁇ a right angular shape and leads to an exponential increase in the course of saturating V_MP the mixed potential.
  • the driving current waveform V_ST may have a Si ⁇ nus-, triangle or otherwise shaped pulse shape.
  • the current source is preferably isolated from an evaluation and / or heating circuit in order to avoid cross-influences when pumping the mixed potential sensor 5.
  • a maximum and Mi ⁇ nimalwert can be determined, which can be with reference values vergli- Chen and thus information about theterrorismszu ⁇ stood enable the mixed potential sensor 5.
  • Wei ⁇ se aging of the electrodes and the mixed potential ⁇ sensor 5 can be checked and an activity of the entire mixed potential sensor 5 to be controlled to a loading of the motor vehicle 3 drove the measurement signals of the Mischpotenti ⁇ alsensors 5 to attach a certain credibility ,
  • mixed potential sensor 5 can be done to get back to allow a timely manner a reliable determination of emissions or other gas concentrations, and thus possibly affect operation of the motor vehicle 3 before ⁇ geous. In this way can also be determined whether the gas sensi ⁇ tive electrode or electrodes of the mixed potential sensor 5 are poisoned by, for example maximum deflections of the determined course V_MP the mixed potential with previously ka ⁇ libri Erten and measurement signals of the non-poisoned mixed potential sensor 5 are compared.
  • “Poisoned” with the term in this context is a reversible or irreversible deposition of different substances referred to, which are deposited on the electrodes and their activity adversely beeinflus ⁇ sen.
  • the mixed potential sensor in a functional operating state during a driving means of electric current with a value of 100 nA a course of the mixed potential with an amplitude of 60 mV.
  • Is in the context of a diagnosis of the mixed potential sensor 5 then only an amplitude of 10 mV of course V_MP he ⁇ averages, this may be one or more electrodes and, optionally, point to a poisoning of the mixed potential sensor 5 is indicative of a reduced quantityi ⁇ ty.
  • Figure 3 shows a flowchart for a method of diagnosis of the mixed potential sensor 5, in which in a step Sl, for example, the mixed potential sensor 5 seen by electrical current is driven specified, for example ge ⁇ Mäss the curve shown in Figure 2 V_ST, and thereby the mixed potential between the first and second electrode is selectively changed.
  • the history V_MP will play as determined at ⁇ according to the illustrated in Figure 2 track by allowing selectively a ⁇ brought by means of the current profile V_ST disorder is monitored.
  • the functional state of the mixed potential sensor is then determined as a function of the determined gradient V_MP 5, and thus the functional state of the mixed potential 5, for example with respect to aging, Ak ⁇ tivity and electrode and gas transition is determined.
  • such a determination includes, for example, a trimming the ermit ⁇ telten V_MP course with predetermined stored values.
  • the method of the determined course V_MP can also be in terms of electrode and / or material functionality, ONS an oxidation and electrode material state and / or activity of the three-phase boundary layer of the mixed potential sensor are checked 5 via ⁇ .

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Testing Of Engines (AREA)

Abstract

L'invention concerne un procédé pour effectuer un diagnostic d'un capteur de potentiel mixte (5) pour un véhicule automobile (3), ce procédé consistant à exciter le capteur de potentiel mixte (5) au moyen d'un courant électrique et à modifier ainsi le potentiel mixte entre une première électrode sensible au gaz et une deuxième électrode de référence du capteur de potentiel mixte (5) conçues pour générer, en fonction d'un gaz à mesurer, un signal de mesure qui, en tant que potentiel mixte, est représentatif d'une concentration du gaz. Ce procédé consiste en outre à déterminer une courbe (V_MP) du potentiel mixte modifié et à déterminer un état de fonctionnement du capteur de potentiel mixte (5) en fonction de la courbe déterminée (V_MP).
PCT/EP2016/080765 2015-12-14 2016-12-13 Procédé, dispositif, système, programme d'ordinateur et produit-programme d'ordinateur pour le diagnostic d'un capteur de potentiel mixte WO2017102709A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015225118.7A DE102015225118A1 (de) 2015-12-14 2015-12-14 Verfahren, Vorrichtung, System, Computerprogramm und Computerprogrammprodukt zur Diagnose eines Mischpotentialsensors
DE102015225118.7 2015-12-14

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WO2017102709A1 true WO2017102709A1 (fr) 2017-06-22

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DE102017218612A1 (de) * 2017-10-18 2019-04-18 Hochschule Karlsruhe-Technik Und Wirtschaft Verfahren zum Betrieb eines Mischpotentialsensors und Verfahren zur Steuerung einer Verbrennungsanlage mit diesem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050284772A1 (en) * 2004-06-18 2005-12-29 Bjr Sensors, Llc. Method of sensor conditioning for improving signal output stability for mixed gas measurements
DE102010028543A1 (de) * 2010-05-04 2011-11-10 Robert Bosch Gmbh Verfahren und Vorrichtung zur Detektion verschiedener Gase in einem Messgasraum
DE102012213601A1 (de) * 2012-08-01 2014-02-06 Continental Automotive Gmbh Überprüfung einer Lambdasonde

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Publication number Priority date Publication date Assignee Title
DE102012219282A1 (de) * 2012-10-23 2014-04-24 Robert Bosch Gmbh Verfahren und Vorrichtung zur Diagnose des Luftreferenzkanals einer Breitband-Lambdasonde

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050284772A1 (en) * 2004-06-18 2005-12-29 Bjr Sensors, Llc. Method of sensor conditioning for improving signal output stability for mixed gas measurements
DE102010028543A1 (de) * 2010-05-04 2011-11-10 Robert Bosch Gmbh Verfahren und Vorrichtung zur Detektion verschiedener Gase in einem Messgasraum
DE102012213601A1 (de) * 2012-08-01 2014-02-06 Continental Automotive Gmbh Überprüfung einer Lambdasonde

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NORIO MIURA ET AL: "A review of mixed-potential type zirconia-based gas sensors", IONICS, vol. 20, no. 7, 28 May 2014 (2014-05-28), DE, pages 901 - 925, XP055229444, ISSN: 0947-7047, DOI: 10.1007/s11581-014-1140-1 *

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