EP3152561A1 - Procédé de fonctionnement d'un capteur de gaz permettant d'améliorer la stabilité à long terme de ce dernier - Google Patents

Procédé de fonctionnement d'un capteur de gaz permettant d'améliorer la stabilité à long terme de ce dernier

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Publication number
EP3152561A1
EP3152561A1 EP15738102.1A EP15738102A EP3152561A1 EP 3152561 A1 EP3152561 A1 EP 3152561A1 EP 15738102 A EP15738102 A EP 15738102A EP 3152561 A1 EP3152561 A1 EP 3152561A1
Authority
EP
European Patent Office
Prior art keywords
electrodes
gas sensor
voltage
gas
short
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.)
Withdrawn
Application number
EP15738102.1A
Other languages
German (de)
English (en)
Inventor
Sabine Fischer
Maximilian Fleischer
Erhard Magori
Ralf Moos
Roland Pohle
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP3152561A1 publication Critical patent/EP3152561A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01N27/4073—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 for operating a gas sensor to improve the long - term stability of the gas ⁇ sors. Rising requirements with regard to the emission of exhaust gases and the efficiency in the operation of power plants, combustion plants, waste incineration plants, gas turbines and engines of all kinds can be countered by, among other things, determining the composition of gases in the respective plants during operation and evaluating them for improved operation becomes. This results in a need for sensors for Be ⁇ determination of components of a gas mixture. An example of this is the ever-increasing number of motor vehicles, for which stricter exhaust gas regulations have to be complied with in order to limit the damage to the environment and health caused by combustion exhaust gases.
  • Known sensors that overcome these disadvantages are based on yttrium-stabilized zirconia (YSZ) and are similar in construction to the conventional lambda probe. There are thereby Elect ⁇ roden same material used tin for example, from plan-. In the classical operating principle of this sensor, a simultaneous measurement of oxygen and NOx is carried out in a two-chamber system. The disadvantage of this typi ⁇ rule Sensorprinizip but always a complex structure of the sensor and thus a high price. A second, newer option for a functional principle of the gas sensor is disclosed in the German patent application 102013222195.9. This gas sensor comprises an oxygen ion-conducting material and at least two electrodes arranged on the ion-conducting material.
  • the electrodes are made of the same material in this gas sensor.
  • the gas sensor is furthermore configured in such a way that, when the gas sensor is in operation, both electrodes come into contact with the gas mixture. It is therefore not necessary in this case that the gas sensor has a two-chamber system. This greatly simplifies the construction of the gas sensor.
  • the measurement of these gas sensors is based on a polarization method in which the NOx concentration is measured by means of voltage pulses and a subsequent depolarization. Disadvantageously, these sensors show a change in both the polarization current and the discharge curves during prolonged use. This change results in a noticeable degradation of the sensor signal. It is therefore an object of the present invention to provide a method which overcomes the disadvantages mentioned and improves the long-term stability of the gas sensor. The object is achieved by a method according to claim 1.
  • the inventive method for operating a gas sensor for the detection of nitrogen oxides in a gas mixture comprises several steps. First of all, a gas sensor with at least two electrodes arranged on an oxygen ion conductor is provided from the same material, with both electrodes coming into contact with the gas mixture during operation of the gas sensor. The electrodes are polarized such that a voltage is changed from a first voltage to a second voltage. The depolarization of the electrodes in the presence of the gas mixture will be indicative ⁇ net. Subsequently, the electrodes are short-circuited in such a way that, after short-circuiting, the first voltage is applied to the electrodes.
  • the voltage after depolarization is different in dependence of the NO concentration.
  • These different voltage differences between the first and second voltage disadvantageously add up without the short-circuiting of the electrodes, so that the sensor signal degrades in the case of long-term measurements .
  • This degradation of the sensor signal is advantageously reduced by the method according to the invention.
  • the first voltage after short-circuiting is close to 0V.
  • the short-circuiting lasts less than 20 ms.
  • the polarization typically lasts from 100 ms to 1 s and the depolarization from 1 s -3 s.
  • Advantage- thus, short-circuiting hardly prolongs the analysis time of the gas sensor.
  • the method repeats cyclically with mutual polarity.
  • the method repeats cyclically with the same polarity.
  • a first of the two electrodes then is advantageously a measuring electrode and a second of the two electrodes, a Polarisationselekt ⁇ rode.
  • Advantageously can in this case material einspa ⁇ reindeer, since the second electrode only serves for the polarization and thus can be carried out significantly smaller.
  • the first electrode can be optimized as a measuring electrode advantageous in terms of functionality, design and appropriate placement.
  • the polarization of the electrodes is carried out with a time constant voltage.
  • the polarization can also be done with a time variable voltage.
  • FIG. 1 shows a gas sensor for operation with the short-circuit method
  • FIG. 2 shows a method for operating the gas sensor with short-circuit and mutual polarization
  • FIG. 3 shows a method for operating the gas sensor with short-circuit and one-sided polarization.
  • FIG. 1 shows a gas sensor 10 in a highly schematic manner. This comprises a block 11 of yttrium-stabilized
  • YSZ Zirconia
  • a first platinum electrode 12 is arranged, while 13 is placed ⁇ introduced on a second side opposite the first side opposite a second platinum electrode.
  • the platinum electrodes 12, 13 are electrically connected to a device 14 for generating and measuring voltage US.
  • Not shown in Figure 1 are means by which the first gas sensor 10 can be placed in a space filled with the gas mixture to be measured space, for example, a flange for screwing into a correspondingly shaped opening.
  • These means and the gas sensor 10 are designed so that after attaching the gas sensor 10, both the first and the second platinum electrode 12, 13 are in direct contact with the gas mixture.
  • a contact of the block 11 with, for example, the ambient air, however, is thereby expediently avoided.
  • In the operation of the gas sensor 10 is alternately by means of
  • FIG. 2 shows the voltage curve of a typical NO measurement of the gas sensor plotted over the time of the measurement.
  • the electrodes of the gas sensor are brought from a first voltage U M to a second voltage + Uo for a time trough to. + Uo in this example is 1 V, U M ⁇ typi cally almost 0V.
  • the depolarization of the electrodes takes place in the NO-containing gas mixture.
  • the measured value is the
  • FIG. 2 shows an alternative arrangement of the measurement cycles with only one-sided polarization.
  • the first measurement cycle 1 is analogous to Figure 1 shown in the first measuring cycle 1.
  • a second measurement cycle 2 but then is followed by a measurement ⁇ cycle, in which in turn is carried by the polarization of a voltage U M to + Uo. This is advantageously possible because the voltage U M has been reached again by the short circuit and there is no residual voltage after time ti.

Landscapes

  • 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)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

La présente invention concerne un procédé de fonctionnement d'un capteur de gaz permettant de détecter des oxydes d'azote dans un mélange gazeux, qui comprend les étapes consistant à : prendre un capteur de gaz comportant au moins deux électrodes en matériau identique, agencées sur un conducteur d'ions oxygène, les deux électrodes étant en contact avec le mélange gazeux lors du fonctionnement dudit capteur ; effectuer une polarisation des électrodes de façon à faire varier une tension d'une première valeur à une deuxième valeur, la dépolarisation des électrodes en présence du mélange gazeux étant enregistrée ; et enfin mettre en court-circuit les électrodes de sorte que la première valeur de tension soit présente au niveau des électrodes après le court-circuit.
EP15738102.1A 2014-07-23 2015-07-16 Procédé de fonctionnement d'un capteur de gaz permettant d'améliorer la stabilité à long terme de ce dernier Withdrawn EP3152561A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014214413.2A DE102014214413A1 (de) 2014-07-23 2014-07-23 Verfahren zum Betrieb eines Gassensors zur Verbesserung der Langzeitstabilität des Gassensors
PCT/EP2015/066256 WO2016012336A1 (fr) 2014-07-23 2015-07-16 Procédé de fonctionnement d'un capteur de gaz permettant d'améliorer la stabilité à long terme de ce dernier

Publications (1)

Publication Number Publication Date
EP3152561A1 true EP3152561A1 (fr) 2017-04-12

Family

ID=53546648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15738102.1A Withdrawn EP3152561A1 (fr) 2014-07-23 2015-07-16 Procédé de fonctionnement d'un capteur de gaz permettant d'améliorer la stabilité à long terme de ce dernier

Country Status (3)

Country Link
EP (1) EP3152561A1 (fr)
DE (1) DE102014214413A1 (fr)
WO (1) WO2016012336A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE513477C2 (sv) * 1993-11-08 2000-09-18 Volvo Ab Sensor för detektering av kväveoxidföreningar
DE19505369C1 (de) * 1995-02-17 1996-07-11 Rainer Gorris Verfahren zur Verbesserung der Funktion und katalytischen Aktivität von Elektroden und katalytisch wirkenden Substanzen in einem elektrochemischen oder elektrokatalytischen Prozeß
DE19800027B4 (de) * 1998-01-02 2004-01-29 Robert Bosch Gmbh Verfahren und Vorrichtung zur Erfassung des Sauerstoffgehalts in einem Meßgas
US7585402B2 (en) * 2004-06-18 2009-09-08 Bjr Sensors, Llc Method of sensor conditioning for improving signal output stability for mixed gas measurements
DE102013222195A1 (de) 2013-10-31 2015-04-30 Siemens Aktiengesellschaft Gassensor zur Detektion von Stickoxiden und Betriebsverfahren für einen solchen Gassensor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2016012336A1 *

Also Published As

Publication number Publication date
WO2016012336A1 (fr) 2016-01-28
DE102014214413A1 (de) 2016-01-28

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