EP2411794A2 - Procédé permettant de faire fonctionner un élément capteur et élément capteur correspondant - Google Patents

Procédé permettant de faire fonctionner un élément capteur et élément capteur correspondant

Info

Publication number
EP2411794A2
EP2411794A2 EP10709446A EP10709446A EP2411794A2 EP 2411794 A2 EP2411794 A2 EP 2411794A2 EP 10709446 A EP10709446 A EP 10709446A EP 10709446 A EP10709446 A EP 10709446A EP 2411794 A2 EP2411794 A2 EP 2411794A2
Authority
EP
European Patent Office
Prior art keywords
sensor element
internal resistance
exhaust gas
internal combustion
gas
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
EP10709446A
Other languages
German (de)
English (en)
Inventor
Peer Kruse
Jens Schneider
Lothar Diehl
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2411794A2 publication Critical patent/EP2411794A2/fr
Ceased 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
    • G01N27/4065—Circuit arrangements specially adapted therefor
    • 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

Definitions

  • the invention relates to a method for operating a sensor element for determining the concentration of gas components in the exhaust gas of internal combustion engines and a sensor element for determining the concentration of gas components in the exhaust gas of internal combustion engines.
  • the subject matter of the present invention is also a computer program and a computer program product which are suitable for carrying out the method.
  • Such sensors which are also referred to as lambda probes, are known, for example, from the book publication "Bosch Kraftfahrtechnisches Taschenbuch” 25th edition, pages 133 ff, a sensor for determining gas components and / or the concentration of gas constituents in gas mixtures, in particular in exhaust gases of internal combustion engines, with a reference electrode which can be acted upon by a reference gas channel with a reference gas, in particular air or an oxygen-containing gas, is also known from DE 100 43 089 C2.
  • Sensor elements for lambda probes which are usually constructed in a planar manner, have a reference gas channel in which a reference electrode is arranged. These sensors are used for example as jump probes.
  • these sensors are also operated with a so-called pumped reference or with a reference applied to a pumping voltage reference, in which the reference electrode is supplied from the exhaust gas with oxygen via an impressed anodic current.
  • the unburned hydrocarbons in the reference gas channel usually diffuse slower than oxygen
  • a single hydrocarbon molecule typically transcribes more than a single oxygen molecule so that the effective oxygen consumption rate of diffused unburned hydrocarbons is greater than the pure oxygen diffusion rate. This results in a relative enrichment of unburned hydrocarbons or a relative lack of oxygen at the reference electrode.
  • the risk of CSD behavior in the reference gas channel is significantly greater than in the inner volume in the probe housing, which is in communication with the reference gas channel.
  • the CSD behavior can now be counteracted by the fact that the sensor element is acted upon by applying an electrical voltage with an electron current, thereby driving an oxygen ion current.
  • the oxygen ion current passes into an oxygen flow at the reference electrode and leads via the reference channel into the outer region of the sensor element. tes.
  • a sufficient oxygen partial pressure is generated in order to oxidize or transport off fat gas components, so that the CSD behavior is actively eliminated.
  • the internal resistance of such lambda probes is also temperature-dependent. If such probes are operated with a pumping current, a pumping current leads to a voltage drop at the internal resistance and thus to a displacement of the measuring signal. With constant supply voltage and constant internal resistance (which is due to a constant temperature), the voltage drop is constant and can thus be considered in advance in the control unit. For unheated sensors, however, the internal resistance depends on the exhaust gas temperature. This can lead to a temperature-dependent voltage drop across the internal resistance, which corresponds to a signal delay. This is proportional to the pumping current.
  • Unheated lambda sensors known in the art are usually operated without pumping current. On the one hand, this leads to a disappearance of the temperature-dependent signal delay due to the proportionality of the signal delay to the pumping current. On the other hand, in this way no pumping action to eliminate the CSD behavior by flushing the reference channel can be achieved.
  • the invention is therefore based on the object to provide a method for operating an unheated sensor element, in particular a lambda probe, and such a lambda probe in which the CSD behavior is eliminated.
  • This object is achieved by a method for operating a sensor element for determining the concentration of gas components in the exhaust gas of internal combustion engines and a sensor element having the features of the independent claims 1 and 4.
  • the basic idea of the invention is to minimize the CSD behavior, ie a signal delay in the case of unheated lambda probes, by first determining the internal resistance of the sensor element and by adjusting the supply voltage of the sensor element with increasing temperature and thereby decreasing internal resistance in such a way that the control point of the sensor element does not change, that is, is located at the same point and while a predeterminable minimum pumping current is not exceeded.
  • the advantage of this measure is an increased pumping at high temperatures at which fat gas can increasingly evaporate from the pack.
  • the internal resistance of the sensor element is measured.
  • the internal resistance over the temperature of the sensor element based on the operating parameters of the internal combustion engine is calculated or taken from a map. In this case, depending on, for example, the operating point of the internal combustion engine, the exhaust gas temperature, the exhaust gas amount ratio, the Abgasmassen- ström determined, and from these on the temperature and thus the internal resistance of the sensor element.
  • Zirconia instead of yttria-stabilized zirconia in the area under the outer electrode with a thickness between 10 microns and 50 microns from.
  • lower internal resistance values can be achieved, especially in the low-temperature range, because the resistance component of the ion-installation reaction is lowered.
  • local areas with yttrium-stabilized zirconium oxide can be used. This applies in particular to the layers via which one or both electrodes are connected to the electrolyte.
  • Such a lambda probe is also operated with a very low pumping current, which leads to the lowest possible voltage distortion and still ensures a CSD and shunt resistance.
  • the pump currents are in the range between 0 ⁇ A and 10 ⁇ A, preferably between 2 ⁇ A and ⁇ ⁇ A.
  • a sensor element according to the invention is shown schematically in section.
  • FIG. 1 shows schematically a sensor element which is formed by an electrolyte 100 which can be applied to a carrier 105, for example by screen printing.
  • the electrolyte has a thickness of about 500 microns.
  • the lambda probe has an outer electrode 110 which is exposed to the exhaust gas (not shown) and which is connected to a control unit SG via an electrical line 11 1 shown only schematically in FIG. 1 and a reference arranged in a reference gas volume 130 (reference gas channel) - Electrode 120, which is also connected via a line 140 to the control unit SG.
  • the electrode surface in particular of the electrode 1 10 exposed to the exhaust gas, is chosen to be as large as possible, ideally it is chosen to be maximum, taking into account the structural conditions and the resulting temperature distributions.
  • the reference electrode 120 whose surface adjoins the electrode exposed to the exhaust gas
  • the probe 1 10 is positioned as close as possible to the outer surface of the probe in order to couple the electrolyte arranged therebetween as well as possible to the hot exhaust gas.
  • the probe can be operated with a pump current that is chosen to be as small as possible in order to ensure a low voltage delay while still ensuring the CSD and shunt capability.
  • Pump currents are in the range between 0 ⁇ A and 10 ⁇ A, in particular and preferably in the range between 2 ⁇ A and 5 ⁇ A.
  • a pump current only at a higher temperature, for example> 500 0 C, to switch on, which serves to bring about a "Abreak- tion" of evaporating from the packing fat gas.
  • An outlet 132 of the pumping gas is designed to be small, in order to prevent the penetration of grease gas to the reference electrode 120 as far as possible, however, it must be so large that a pressure equalization with the environment is ensured, whereby porous layers with a high flow resistance must be avoided, an open channel with a correspondingly small diameter being preferred
  • the reference channel can be realized by a simple pressure layer with a sacrificial layer of thickness 20 to 30 ⁇ m and a channel width between 0.5 and 1 mm (not shown) .in principle, it is also possible to use a not quite tightly printed electrode feed line as reference channel to use
  • the compensation of the signal delay presupposes the knowledge of the internal resistance of the sensor element, which is first determined. This can be determined, for example, by measurements or by calculation or, for example, by means of a characteristic map, depending on the operating parameters of the internal combustion engine, such as the exhaust gas mass flow, the exhaust gas quantity ratio, the exhaust gas temperature and the like.
  • the method described above can be implemented, for example, as a computer program in the control unit of the internal combustion engine and run there.
  • the program code may be stored on a machine-readable medium that the controller SG can read.

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)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

Procédé permettant de faire fonctionner un élément capteur pour déterminer la concentration de constituants gazeux dans les gaz d'échappement de moteurs à combustion interne, en particulier une sonde lambda. Selon ledit procédé, la résistance interne de l'élément capteur est déterminée et la tension de pompage de l'électrode de référence est réajustée, pour une résistance interne baissant avec la hausse de la température, de manière telle que le point de réglage de l'élément capteur ne se modifie pas et que le courant de pompage ne tombe pas au-dessous d'une valeur minimale prédéfinie.
EP10709446A 2009-03-25 2010-02-18 Procédé permettant de faire fonctionner un élément capteur et élément capteur correspondant Ceased EP2411794A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910001840 DE102009001840A1 (de) 2009-03-25 2009-03-25 Verfahren zum Betreiben eines Sensorelements und Sensorelement
PCT/EP2010/052043 WO2010108731A2 (fr) 2009-03-25 2010-02-18 Procédé permettant de faire fonctionner un élément capteur et élément capteur correspondant

Publications (1)

Publication Number Publication Date
EP2411794A2 true EP2411794A2 (fr) 2012-02-01

Family

ID=42272016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10709446A Ceased EP2411794A2 (fr) 2009-03-25 2010-02-18 Procédé permettant de faire fonctionner un élément capteur et élément capteur correspondant

Country Status (5)

Country Link
EP (1) EP2411794A2 (fr)
CN (1) CN102362174B (fr)
DE (1) DE102009001840A1 (fr)
RU (1) RU2541702C2 (fr)
WO (1) WO2010108731A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013210753A1 (de) 2013-06-10 2014-12-11 Robert Bosch Gmbh Vorrichtung zum Betreiben von Lambdasonden
JP6048463B2 (ja) * 2014-09-01 2016-12-21 トヨタ自動車株式会社 ガス濃度検出装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH063431B2 (ja) * 1984-02-08 1994-01-12 三菱電機株式会社 機関の空燃比センサ
DE4445033A1 (de) * 1994-12-16 1996-06-27 Heraeus Electro Nite Int Verfahren zur Messung der Konzentration eines Gases in einem Gasgemisch sowie elektrochemischer Sensor zur Bestimmung der Gaskonzentration
JPH10239276A (ja) * 1996-12-27 1998-09-11 Ngk Insulators Ltd 一酸化炭素ガスセンサおよび同センサを用いた測定装置
DE19928561C2 (de) * 1999-06-22 2003-02-06 Bayerische Motoren Werke Ag Verfahren zur Schätzung von Temperaturgrößen im Abgasstrang einer Brennkraftmaschine
DE10043089C2 (de) 2000-09-01 2003-02-27 Bosch Gmbh Robert Gassensor
JP4682465B2 (ja) * 2000-10-31 2011-05-11 株式会社デンソー ガス濃度検出装置
US6787014B2 (en) * 2001-10-09 2004-09-07 Kabushiki Kaisha Riken Gas-detecting element and gas-detecting device comprising same
JP3880506B2 (ja) * 2001-12-27 2007-02-14 株式会社日本自動車部品総合研究所 ガス濃度検出装置
JP4662207B2 (ja) * 2005-11-28 2011-03-30 日本特殊陶業株式会社 空燃比検出装置
DE102006041184A1 (de) * 2006-09-01 2008-03-06 Robert Bosch Gmbh Schaltungsanordnung zum Betreiben einer Führungssonde
DE102008023695A1 (de) * 2008-05-15 2009-11-19 Robert Bosch Gmbh Sensorelement mit verbesserten dynamischen Eigenschaften

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010108731A2 *

Also Published As

Publication number Publication date
RU2541702C2 (ru) 2015-02-20
WO2010108731A2 (fr) 2010-09-30
DE102009001840A1 (de) 2010-09-30
WO2010108731A3 (fr) 2010-11-25
RU2011142616A (ru) 2013-04-27
CN102362174A (zh) 2012-02-22
CN102362174B (zh) 2014-11-05

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