EP1738162A1 - Procede et dispositif permettant de faire fonctionner une cellule de detecteur pour l'analyse de gaz d'echappement - Google Patents

Procede et dispositif permettant de faire fonctionner une cellule de detecteur pour l'analyse de gaz d'echappement

Info

Publication number
EP1738162A1
EP1738162A1 EP05717051A EP05717051A EP1738162A1 EP 1738162 A1 EP1738162 A1 EP 1738162A1 EP 05717051 A EP05717051 A EP 05717051A EP 05717051 A EP05717051 A EP 05717051A EP 1738162 A1 EP1738162 A1 EP 1738162A1
Authority
EP
European Patent Office
Prior art keywords
sensor
exhaust gas
heating element
pwm
potential
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Withdrawn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
EP05717051A
Other languages
German (de)
English (en)
Inventor
Torsten Reitmeier
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.)
Continental Automotive GmbH
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 EP1738162A1 publication Critical patent/EP1738162A1/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Withdrawn legal-status Critical Current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
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/419—Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells
    • 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

Definitions

  • the present invention relates to a method and a device for operating a sensor cell for exhaust gas analysis, as are used in a known manner in the exhaust gas tracts of internal combustion engines for regulating and reducing pollutant emissions.
  • exhaust gas analysis sensor cells are used to determine a content of nitrogen oxides and other environmentally harmful gases which are components of an exhaust gas mixture.
  • the required control variables are prepared for the control from the electrical output signals of these sensors.
  • Ceramic probes have proven themselves as ⁇ probes and nitrogen oxide or NOx sensors for motor vehicle exhaust gases.
  • Essentially zirconium oxide Zr0 2 is used as the ceramic material, which is heated to temperatures between 300 and 850 ° C. during operation by an electrical resistance heater.
  • broadband ceramic probes of the type used as ⁇ and nitrogen oxide sensors in motor vehicle technology for regulating pollutant emissions are dealt with below.
  • these probes or sensors are arranged in the exhaust tract such that ⁇ sensors are arranged in front of a catalytic converter and nitrogen oxide sensors behind a catalytic converter in the exhaust tract.
  • planar, and or resistance jump probes not only in a range around ⁇ ⁇ l, but continuously over a wide ⁇ range of the mixtures from rich to lean.
  • Broadband probes have two cells for this purpose, namely a so-called pump cell and a concentration cell, which is also referred to as a sensor cell or Nernst cell.
  • a corresponding control based on an output signal of a broadband probe is therefore able to continuously produce any desired air ratio ⁇ in the combustion chamber of an internal combustion engine.
  • a broadband ⁇ probe which in principle consists of two cells, is in contact with three different media, namely air from the environment and an exhaust gas mixture and a ⁇ -one mixture.
  • the ⁇ -one mixture is generated automatically in the measuring chamber from exhaust gas and ambient air by a pump current I p .
  • This pump current I p is evaluated as a measure of the air ratio ⁇ .
  • the broadband probe In order to be able to initiate this process at all, the broadband probe must first be brought to a minimum operating temperature of around 500 ° C. At this temperature, the zirconium oxide ceramic loses its property as an electrical insulator to such an extent that it becomes permeable to oxygen ions and acts as a solid electrolyte for ion transport.
  • a respective electrical reference of a respective sensor is essentially synchronous with the arithmetic mean of the supply voltage of the electrical heating element.
  • the present invention is based on the finding that in exhaust gas sensors with a heater layer which is applied directly to the respective ceramic without an air gap, leakage currents between the heater layer and a reference electrode cannot be prevented, as a result of which measurement errors occur at least in a regulated heating mode due to the Shift of the reference potential inevitably result. It has been shown that a significant measurement error occurs in the pulse-width-modulated control mode of the heater layer, as is proposed, for example, in DE 102 21 392.5 as the mode of operation which is slightly stressful for the electrodes. An alleviation of the problem by eliminating the influence of electrical currents between the heater layer and the reference electrode can be labeled by taking measurements only outside an activity interval of the pulse-width-modulated heater voltage signal.
  • Disturbance for the exhaust gas sensor may have been impressed.
  • an electrode P + is to be changed as an electrical reference of a broadband sensor with a previously empirically determined or also calculated correction value synchronously with the arithmetic mean value of the battery voltage.
  • a weighted DC component of the variable battery voltage is thus added to the potential of the electrical reference electrode.
  • control signal of the heater layer is subjected to an RC element to determine an arithmetic mean value as a pulse-width-modulated voltage signal.
  • the output signal of the RC element is amplified by a factor k in an amplifier and added to the potential of the electrode P + via a summation point. This results in a corrected potential difference between the reference electrode and the electrode P + has been substantially freed from the interference listed above.
  • Figure 1 a sectional view through a broadband sensor, for ⁇ measurement with associated wiring and
  • FIG. 2 a block diagram to illustrate a ballast according to the invention.
  • FIG. 1 shows a section through a basic structure of a measuring sensor which, depending on the specific configuration, can detect the NOx concentration of combustion products in an exhaust tract of an internal combustion engine, or a corresponding air ratio ⁇ .
  • the sensor shown is designed as a sensor 1 and essentially consists of a solid electrolyte 2, here zirconium dioxide Zr0 2 .
  • an internal structure with separate chambers or measuring cells 3, 4, 5 is created by a layered structure, which are each accessible via associated channels 3a, 4a, 5a.
  • the entire ceramic sensor 1 is brought to operating temperature by an electrical heater layer 6, the control signal of the heater layer 6 being a pulse-width-modulated and clocked voltage V P W M.
  • an additionally inserted insulation layer 7 made of Al 2 O 3 ceramic cannot prevent the flow of leakage currents from the higher potential of the heater layer to lower potentials within the sensor 1.
  • Potential measuring points are arranged in the area of each of the cells 3, 4, 5 as electrodes Ref, P-, P +, Ml and M2. Due to the creeping currents shown in the form of the curved arrow and the associated potential shifts, the measuring accuracy of the sensor cell 1 is substantially disturbed in the course of its actual measuring activity, as described below:
  • Combustion gas mixture A is supplied to the first measuring cell 4 via the duct 4a from the exhaust tract (not shown further).
  • the sensor 1 When the sensor 1 is switched on, a small amount of gas enters the otherwise closed channel 5a Cell 5.
  • the electrodes Ml, M2 are pumped through the surrounding solid electrolyte by means of the external circuit shown with current and voltage sources 0 2- ions. Accordingly, cell 5 is also referred to as a pump cell.
  • Cell 3 is supplied with ambient air U or unused outside air with an oxygen content of 21% via duct 3a and serves as a reference cell with respect to sensor cell 4 filled with exhaust gas mixture A.
  • the electrode Ref in the cell 3 represents the reference potential for all voltage measurements. Falsifications ⁇ V due to leakage currents and corresponding shifts in this reference potential V Re f thus act as a fundamental error on all voltage and current measurements, on the basis of which a NOx content or a T.value are ultimately determined.
  • FIG. 2 now shows a compensation method for eliminating the errors described above, which is implemented in the form of a ballast 9.
  • the ballast-modulated and clocked control signal V PWM of the heating element 6 is supplied to the ballast 9 as an input signal.
  • An RC element determines an arithmetic one from this control signal V PWM
  • the correction value k is previously determined empirically in experiments, but it can also be calculated.
  • a relatively simple test can be carried out in a laboratory measuring station in that supply voltages U bat or pulse width-modulated heater control voltages V PWM are added to a sensor with constant values for NOx or the air ratio ⁇ , for example. Time constants ⁇ in a range between 3 and 4 seconds are determined from the signal changes. A calibration measure is obtained from this that can be effectively used against fast and periodic disturbances in a range of ⁇ t approximately 1 second.
  • a method according to the invention and a corresponding implementation thus achieve an overall quiet NOx signal even with larger battery voltage fluctuations in the dynamic range. This results in higher accuracy, especially for a binary ⁇ signal in the stationary range, with more precise observance of the quantities important for ... the life of a sensor 1 described above.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de faire fonctionner une cellule de détecteur (1) pour l'analyse de gaz d'échappement. L'invention a pour but de disposer d'un procédé et d'un dispositif correspondant, capables de fournir, même en utilisant une régulation de l'élément de chauffage (6), avantageusement commandée par largeur d'impulsion, des résultats de mesure fiables, dans chaque état de fonctionnement d'un détecteur. A cet effet, l'invention est caractérisée en ce que le potentiel de l'électrode de référence (Réf) du détecteur est corrigé de manière sensiblement synchronisée avec la moyenne arithmétique de la tension d'alimentation (Vpwm) de l'élément de chauffage électrique (6).
EP05717051A 2004-04-19 2005-03-15 Procede et dispositif permettant de faire fonctionner une cellule de detecteur pour l'analyse de gaz d'echappement Withdrawn EP1738162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004018871A DE102004018871B4 (de) 2004-04-19 2004-04-19 Verfahren und Vorrichtung zum Betreiben einer Abgas-Analyse-Sensorzelle
PCT/EP2005/051178 WO2005100970A1 (fr) 2004-04-19 2005-03-15 Procede et dispositif permettant de faire fonctionner une cellule de detecteur pour l'analyse de gaz d'echappement

Publications (1)

Publication Number Publication Date
EP1738162A1 true EP1738162A1 (fr) 2007-01-03

Family

ID=34961778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05717051A Withdrawn EP1738162A1 (fr) 2004-04-19 2005-03-15 Procede et dispositif permettant de faire fonctionner une cellule de detecteur pour l'analyse de gaz d'echappement

Country Status (5)

Country Link
US (1) US20070222454A1 (fr)
EP (1) EP1738162A1 (fr)
JP (1) JP2007532927A (fr)
DE (1) DE102004018871B4 (fr)
WO (1) WO2005100970A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006014266A1 (de) * 2005-12-23 2007-06-28 Robert Bosch Gmbh Breitband-Lambdasonde
JP5189537B2 (ja) * 2009-03-27 2013-04-24 日本碍子株式会社 ガスセンサおよびガスセンサの電極電位の制御方法
US10900433B2 (en) 2019-05-21 2021-01-26 Delphi Technologies Ip Limited Oxygen sensor system and method
US10746118B1 (en) * 2019-07-02 2020-08-18 Delphi Technologies Ip Limited Compensator circuitry and method for an oxygen sensor
DE102019219647A1 (de) * 2019-12-16 2021-06-17 Robert Bosch Gmbh Messung des Nebenschlusswiderstands einer Lambdasonde und Korrektur dessen Einflusses
JP7452477B2 (ja) * 2021-03-18 2024-03-19 株式会社デンソー ガス濃度検出装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022192B (de) * 1956-10-26 1958-01-09 Balzers Geraeteverkaufsgesells Verfahren zum Aufbringen von UEberzuegen auf Kohle-, Graphit- und anderen Materialien
DE4423390A1 (de) * 1994-07-04 1996-01-11 Roth Technik Gmbh Schaltungsanordnung
JP3332761B2 (ja) * 1996-11-08 2002-10-07 日本特殊陶業株式会社 酸素濃度・窒素酸化物濃度測定方法及び装置
JP3664558B2 (ja) * 1996-12-20 2005-06-29 日本碍子株式会社 ガスセンサ
JP3796333B2 (ja) * 1996-12-20 2006-07-12 日本碍子株式会社 ガスセンサ
US6254750B1 (en) * 1997-07-29 2001-07-03 Ecm Engine Control And Monitoring Exhaust emission sensors
DE19743644C2 (de) * 1997-10-02 1999-12-16 Bosch Gmbh Robert Verfahren zum Betrieb eines Gassensors
EP2163889A1 (fr) * 1999-02-03 2010-03-17 Denso Corporation Dispositif de mesure de la concentration d'un gaz avec compensation d'erreurs du signal de sortie
DE19944181A1 (de) * 1999-09-15 2001-04-12 Bosch Gmbh Robert Sensor zur Bestimmung der Konzentration von Gaskomponenten in Gasgemischen
DE10221392B4 (de) * 2002-05-14 2004-07-22 Siemens Ag Verfahren und Vorrichtung zur Messung einer Gas-Konzentration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005100970A1 *

Also Published As

Publication number Publication date
WO2005100970A1 (fr) 2005-10-27
DE102004018871A1 (de) 2005-11-10
JP2007532927A (ja) 2007-11-15
US20070222454A1 (en) 2007-09-27
DE102004018871B4 (de) 2006-03-09

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