WO2016071509A1 - Procédé, dispositif, système, programme d'ordinateur et produit programme d'ordinateur pour le fonctionnement d'un élément de détection d'une concentration de gaz - Google Patents

Procédé, dispositif, système, programme d'ordinateur et produit programme d'ordinateur pour le fonctionnement d'un élément de détection d'une concentration de gaz Download PDF

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Publication number
WO2016071509A1
WO2016071509A1 PCT/EP2015/075964 EP2015075964W WO2016071509A1 WO 2016071509 A1 WO2016071509 A1 WO 2016071509A1 EP 2015075964 W EP2015075964 W EP 2015075964W WO 2016071509 A1 WO2016071509 A1 WO 2016071509A1
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WO
WIPO (PCT)
Prior art keywords
sensor element
gas
electrode
concentration
measuring
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2015/075964
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German (de)
English (en)
Inventor
Torsten Reitmeier
Sabrina SCHIESSL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies 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 Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of WO2016071509A1 publication Critical patent/WO2016071509A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01N27/403—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
    • G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts

Definitions

  • the invention relates to a method, a device, a system, a computer program and a computer program product for operating a sensor element for detecting a gas concentration in a gas space, in particular in an exhaust gas tract of a vehicle.
  • the object on which the invention is based is to provide a method, a device, a system, a computer program and a computer program product for operating a sensor element for detecting a gas concentration in a gas space, which contribute to reducing the gas concentration in the gas space easy and accurate to determine.
  • the object is solved by the features of the independent claims.
  • Advantageous developments of the invention are characterized in the subclaims.
  • the invention is characterized by a method and a corresponding device for operating a sensor element for detecting a gas concentration in a gas space.
  • the sensor element comprises a reference electrode and a measuring electrode, which comprises at least one mixed potential electrode which is sensitive to a gas whose concentration is to be detected.
  • the sensor element has a transport layer for the transport of ions, which is conductive for a given temperature for the ions and which is arranged so that it is coupled to the reference electrode and to the measuring electrode.
  • a current is impressed between the measuring electrode and the reference electrode as a function of a provided measured variable which is representative of an oxygen concentration in the gas space.
  • a measurement variable between the measurement electrode and the reference electrode is detected, which is representative of the gas concentration in the gas space.
  • the gas space preferably has a gas mixture.
  • the gas mixture preferably also comprises a measurement gas whose concentration is to be detected by the sensor element.
  • the sensor element is designed to detect the concentration of the measurement gas, for example a hydrocarbon concentration, in the gas space.
  • Different oxygen concentrations in the gas mixture cause a change in a course of a Characteristic of the sensor element, in particular a change in a characteristic increase, also called Ga n, and an offset.
  • the detected measured variable preferably comprises a voltage.
  • the characteristic preferably represents a voltage which is detected between the measuring electrode and the reference electrode, plotted against the gas concentration.
  • the application of the current between the measuring electrode and the reference electrode whose current intensity is set as a function of the oxygen concentration of the gas mixture the characteristics of the sensor element can be shifted so that they are congruent or approximately congruent for all oxygen concentrations. In this way, a compensation of the oxygen cross sensitivity can take place without computational steps.
  • the sensor element can be used universally in various vehicle configurations in both diesel and gasoline vehicles. Furthermore, can be such a change in the sensitivity of the sensor element to below ⁇ Kunststofferie gases.
  • the transport layer is in particular mechanically coupled to the reference electrode and the measuring electrode.
  • the transport ⁇ layer preferably comprises a solid electrolyte, or consists of a solid electrolyte.
  • the transport layer is preferably formed such that they can transport electrolytically in a spe ⁇ -specific operating temperature range oxygen ions.
  • the preparation phase may be a predetermined constant first time period and the measuring phase have a constant predetermined second time period and the prepara ⁇ processing phase and the measurement phase are repeated cyclically.
  • the preparation phase preferably lasts longer than the actual measurement phase.
  • the measuring electrode is sensitive to At least one hydrocarbon compound and the detected measured variable is representative of a concentration of the at least one hydrocarbon compound.
  • the sensor element can be used for monitoring a catalytic converter in a motor vehicle.
  • the sensor element a Erisser ⁇ determining unit for heating at the transport layer.
  • the heating device is activated in the sense of a switch-off.
  • the heating device is controlled in such a way that the transport layer heats up to a predetermined operating temperature at which the transport layer is conductive for the ions.
  • the transport layer may comprise, for example, yttrium-doped zirconium oxide and the operating temperature may be, for example, in a range from 550 ° C to 800 ° C.
  • the sensor element is arranged in an exhaust gas tract of a vehicle. This allows a simple emission control of the vehicle, in particular with regard to future and / or applicable statutory provisions such as the European standard EURO-6 or the US standard SULFE.
  • the invention is characterized by a system comprising the device for operating a sensor element for detecting a gas concentration in a gas space and the sensor element for detecting the gas concentration.
  • the invention is characterized by a computer program, wherein the computer program is formed is to perform the method for operating a sensor element for detecting a gas concentration in a gas space or an advantageous embodiment of the method for operating the sensor element for detecting the gas concentration on a data processing device.
  • the invention is characterized by a computer program product comprising executable program code, wherein the program code when executed by a data processing device, the method for operating a sensor element for detecting a gas concentration in a gas space or an advantageous embodiment of the method for operating the sensor element for detecting the gas concentration leads out.
  • 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 a system comprising a sensor element for detecting a gas concentration in a gas space and a control device
  • Figure 2 is an exemplary flowchart for a program for
  • Figure 3 is a first characteristic diagram
  • FIG 4 is another characteristic diagram. Elements of the same construction or function are provided across the figures with the same reference numerals.
  • FIG. 1 shows a system 10.
  • the system 10 comprises at least one sensor element 20 for detecting a gas concentration in a gas space and a control device 30.
  • FIG. 1 further shows a sectional view of a first exemplary embodiment for the sensor element 20 for detecting the gas concentration in the gas space.
  • the sensor element 20 may be arranged, for example in a motor vehicle at one or more locations.
  • the sensor element 20 may be arranged in an exhaust tract of a vehicle.
  • the sensor element 20 may be disposed at a position in an intake tract of an internal combustion engine ⁇ of the vehicle, for example in a suction of the intake tract.
  • the sensor element 20 has, for example, a measuring electrode 50 and a reference electrode 40.
  • the measuring electrode 50 comprises at least one mixed potential electrode which is sensitive to the gas whose concentration is to be detected.
  • the measuring electrode 50 comprises, for example, a specially doped electrode.
  • the reference electrode 40 includes, for example, a platinum electrode.
  • the sensor element 20 has a transport layer 60 for transporting ions.
  • the transport layer 60 is conductive from a predetermined temperature for the ions.
  • the transport layer 60 is disposed such that it is coupled to the reference ⁇ electrode 40 and the measuring electrode 50th
  • the sensor element 20 may, for example, have a transport layer 60 of yttrium-doped zirconium oxide which is oxygen-ion conductive from the given temperature.
  • the sensor element 20 Refe rence ⁇ electrode 40 and measuring electrode 50 are disposed by way of example on opposite sides of the transport layer 60th
  • the measuring electrode 50 is arranged such that it is beauf ⁇ beat with a gas mixture of the gas chamber
  • the reference electrode 40 is placed in a chamber 70th
  • the reference electrode 40 is thus arranged in a shielded manner from the gas space, so that a reference environment can form in a predetermined region around the reference electrode 40.
  • a heating device 80 For heating the transport layer 60, for example, a heating device 80 is provided which is separated from the transport layer 60 by an insulating layer 90.
  • a control voltage is applied to the heating device 80.
  • the temperature of the heating device 80 can be regulated.
  • the heating device 80 can be used for example to set a Be ⁇ operating temperature of the solid electrolyte.
  • the mixed potential electrode is, for example, sensitive ge ⁇ genüber at least one hydrocarbon compound.
  • the sensor element 20 can thus be used, for example, to determine a hydrocarbon concentration in the exhaust gas line of the internal combustion engine.
  • mixed potential electrodes also called fuel gas-sensitive electrodes or electrodes with non-Nernstian behavior
  • the electrode function is no longer thermodynamic, but determined kinetically.
  • mixing potentials are generated which correlate directly with each other
  • Non-equilibrium exhaust gases such as hydrocarbon compounds or carbon monoxide.
  • the reference electrode 40 which is arranged shielded relative to the gas mixture in the gas space.
  • the reaction at the mixed potential electrode is mainly based on a reaction rate and catalysis of the gas components with oxygen
  • the signal has a large number of cross-sensitivities to almost all reducing and oxidizing gas constituents, ie in addition to the cross-sensitivity to oxygen O2, also to CO, O2, NH3 , and so on. This leads to a large tolerance spectrum. Different media generate different voltages at the same concentration.
  • control device 30 In order to obtain a sufficiently accurate measurement result when detecting the gas concentration, in particular the hydrocarbon concentration, the oxygen cross-sensitivity must be compensated. This can be done, for example, by means of a program executed by the control device 30.
  • the control device 30 may also be referred to as a device for operating a sensor element 20 for detecting a gas concentration in a gas space.
  • a program for operating a sensor element 20 for detecting a gas concentration in a gas space is stored on a data and program memory of the control device 30 for this purpose.
  • the control device 30 may be formed, for example, as part of the sensor element 20 and / or as a separate component.
  • the control device 30 includes, for example, a power source 100, in particular a controllable power source, by means of which the measuring and reference electrode 50, 40 are acted upon during a preparation phase with a current.
  • the current is dependent on a detected and / or determined oxygen concentration and / or a measured variable which is representative of the oxygen concentration in the gas space, set.
  • the oxygen concentration and / or the at least one parameter which is representative of the oxygen concentration in the gas space is provided, for example, by a suitably formed from ⁇ further sensor element for the control device 30.
  • the hydrocarbons react with oxygen.
  • the transport layer, the measuring electrode and the gas space form a three-phase boundary layer.
  • the reaction of the hydrocarbons with oxygen takes place in particular at this three-phase boundary layer.
  • the measuring electrode has a cermet, for example based on zirconium dioxide.
  • the chemical reaction produces water and carbon dioxide.
  • the current supply causes oxygen ions (O 2 -), which reach the measuring electrode 50 through the transport layer 60, to emit electrons and thus further oxygen can be provided at the measuring electrode 50.
  • the supplied electrons cause the oxygen to take up the electrons and give rise to additional oxygen ions which reach the measuring electrode 50 via the transport layer 60. It is thus possible to keep the supply of oxygen at the measuring electrode 50 constant, independently of an oxygen concentration of the gas mixture in the gas space.
  • control device 30 for example, a measuring device which is adapted to detect a measured variable, preferably a voltage between the reference electrode 40 and the measuring electrode 50, which is representative of the gas concentration in the gas space.
  • Figure 2 shows a flowchart of the program for operating the sensor element for detecting the gas concentration. The program is started in a step Sl, in which variables can be initialized if necessary.
  • a current is impressed between the measuring electrode 50 and the reference electrode 40 as a function of a provided measured variable that is representative of an oxygen concentration in the gas space.
  • a voltage between the measuring electrode 50 and the reference electrode 40 which is representative of the gas concentration in the gas space, is detected in a measuring phase following the preparatory phase of step S3.
  • no current is impressed between the measuring electrode 50 and the reference electrode 40 during the measuring phase.
  • the heater 80 is driven such that the transport layer 60 is heated to a predetermined operation ⁇ temperature at which the transport layer 60 is conductive for ions.
  • the heating device 80 is preferably driven in the sense of a shutdown.
  • the transport layer 60 can be heated both in the measurement phase and in the preparation phase. Switching off the heating means 80 during the measurement phase is ⁇ geous in particular, if the insulating layer 90 does not ensure a sufficiently good insulation between heating means 80 and transport layer 60th
  • the program is terminated and can gege ⁇ appropriate, be started in the step Sl again.
  • the program can also be continued again in step S3.
  • the preparatory phase and the measurement phase can zyk ⁇ cally, for setting every 5 ms, are repeated.
  • the preparation phase lasts longer in time than the egg ⁇ tual measurement phase.
  • the preparatory phase ⁇ 4.9 ms and 0.1 ms, the measuring phase lasts.
  • the detected gas concentration is for example a concen tration ⁇ a hydrocarbon compound.
  • Measuring electrode 50 can account for a computational com ⁇ compensation of oxygen interference of the sensor element or at least be facilitated.
  • the sensor element 20 may, for example, different sensitivity to the different hydrocarbon compounds methane (CH4), propane (C3H8), propylene (C3H6) and
  • FIG. 3 shows a characteristic diagram MI with a plurality of voltage profiles.
  • characteristic curves are preferably used.
  • the characteristic curves represent an output voltage of the sensor element 20 plotted against the gas concentration of the gas to be measured. In this example it is hydrocarbon.
  • the characteristic diagram of Ml in each case shows a voltage waveform which has been detected between the reference electrode 40 and measuring electrode 50 depends on various hydrocarbon ⁇ concentrations in the gas space.
  • a first voltage profile Ul was detected, for example, in a gas space in which the Gas mixture in the gas space had an oxygen concentration of 2%.
  • the second voltage curve U2 was detected, for example, in a gas space in which the gas mixture in the gas space had an oxygen concentration of 6%.
  • the third voltage curve U3 was detected, for example, in a gas space in which the gas mixture in the gas space had an oxygen concentration of 10%.
  • Different oxygen concentrations in the gas mixture cause a change in a curve of the characteristic of the sensor element, in particular a change in a characteristic ⁇ rise, also called Gain, and an offset.
  • FIG. 4 shows a further characteristic diagram M2 with a plurality of voltage profiles.
  • the further characteristic diagram M2 shows three voltage profiles which were respectively detected between the reference electrode 40 and the measuring electrode 50 as a function of different hydrocarbon concentrations in the gas space.
  • the reference electrode 40 and measuring electrode 50 are supplied with a current depending on the respective oxygen concentration of the gas mixture in the gas space.
  • the characteristics of the sensor element 20 for detecting the gas concentration are shifted so that they are congruent or approximately congruent for all oxygen concentrations. Computational compensation of oxygen sensitivity is not required or will at least relieved.

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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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un élément de détection qui comprend une électrode de référence (40) et une électrode de mesure (50) pourvue d'au moins une électrode de potentiel mixte qui est sensible à un gaz dont la concentration doit être détectée. En outre, l'élément de détection (20) comporte une couche de transport (60) destinée à transporter des ions qui est conductrice d'ions au-dessus d'une température prédéterminée et qui est disposée de façon à être accouplé à l'électrode de référence (40) et à l'électrode de mesure (50). Dans une phase préparatoire, un courant est généré entre l'électrode de mesure (50) et l'électrode de référence (40) en fonction d'une grandeur de mesure produite qui est représentative de la concentration en oxygène dans la chambre à gaz. Dans une phase de mesure qui fait suite à la phase préparatoire, de préférence dans une phase de mesure qui fait directement suite à la phase préparatoire, une grandeur de mesure, représentative de la concentration de gaz dans la chambre à gaz, est détectée entre l'électrode de mesure (50) et l'électrode de référence (40).
PCT/EP2015/075964 2014-11-07 2015-11-06 Procédé, dispositif, système, programme d'ordinateur et produit programme d'ordinateur pour le fonctionnement d'un élément de détection d'une concentration de gaz Ceased WO2016071509A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014222748.8A DE102014222748A1 (de) 2014-11-07 2014-11-07 Verfahren, Vorrichtung, System, Computerprogramm und Computerprogrammprodukt zum Betreibeneines Sensorelements zum Erfassen einer Gaskonzentration
DE102014222748.8 2014-11-07

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Cited By (1)

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CN112858410A (zh) * 2021-01-21 2021-05-28 中国科学技术大学 一种混合电位型气体传感器及其制备方法

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EP0731351A2 (fr) * 1995-03-09 1996-09-11 Ngk Insulators, Ltd. Méthode et appareil pour mesurer un composant de gaz combustibles en brûlant le composant
EP1004877A2 (fr) * 1998-11-25 2000-05-31 Ngk Spark Plug Co., Ltd Capteur de gaz, méthode de sa fabrication et système utilisant ce capteur de gaz
DE102006062051A1 (de) * 2006-12-29 2008-07-03 Robert Bosch Gmbh Sensorelement mit zusätzlicher Diagnosefunktion
DE102007057707A1 (de) * 2007-11-30 2009-06-04 Robert Bosch Gmbh Verfahren zum Betreiben eines Gassensors zur Bestimmung der Konzentration von Gaskomponenten im Abgas von Brennkraftmaschinen
DE102010028543A1 (de) * 2010-05-04 2011-11-10 Robert Bosch Gmbh Verfahren und Vorrichtung zur Detektion verschiedener Gase in einem Messgasraum

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DE102007002275A1 (de) * 2007-01-16 2008-07-17 Robert Bosch Gmbh Elektrodenmaterial und Mischpotenzialsensor zur Detektion von Gasen, insbesondere von Wasserstoff und Kohlenwasserstoffen, in Gasgemischen sowie Verfahren zu dessen Betrieb

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EP0731351A2 (fr) * 1995-03-09 1996-09-11 Ngk Insulators, Ltd. Méthode et appareil pour mesurer un composant de gaz combustibles en brûlant le composant
EP1004877A2 (fr) * 1998-11-25 2000-05-31 Ngk Spark Plug Co., Ltd Capteur de gaz, méthode de sa fabrication et système utilisant ce capteur de gaz
DE102006062051A1 (de) * 2006-12-29 2008-07-03 Robert Bosch Gmbh Sensorelement mit zusätzlicher Diagnosefunktion
DE102007057707A1 (de) * 2007-11-30 2009-06-04 Robert Bosch Gmbh Verfahren zum Betreiben eines Gassensors zur Bestimmung der Konzentration von Gaskomponenten im Abgas von Brennkraftmaschinen
DE102010028543A1 (de) * 2010-05-04 2011-11-10 Robert Bosch Gmbh Verfahren und Vorrichtung zur Detektion verschiedener Gase in einem Messgasraum

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HASHIMOTO A ET AL: "High-temperature hydrocarbon sensors based on a stabilized zirconia electrolyte and proton conductor-containing platinum electrode", SENSORS AND ACTUATORS B: CHEMICAL: INTERNATIONAL JOURNAL DEVOTED TO RESEARCH AND DEVELOPMENT OF PHYSICAL AND CHEMICAL TRANSDUCERS, ELSEVIER S.A, CH, vol. 81, no. 1, 15 December 2001 (2001-12-15), pages 55 - 63, XP004324020, ISSN: 0925-4005, DOI: 10.1016/S0925-4005(01)00931-5 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112858410A (zh) * 2021-01-21 2021-05-28 中国科学技术大学 一种混合电位型气体传感器及其制备方法
CN112858410B (zh) * 2021-01-21 2022-07-15 中国科学技术大学 一种混合电位型气体传感器及其制备方法

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