EP1461609A1 - Sonde a oxygene destinee a des gaz d'echappement - Google Patents

Sonde a oxygene destinee a des gaz d'echappement

Info

Publication number
EP1461609A1
EP1461609A1 EP02792623A EP02792623A EP1461609A1 EP 1461609 A1 EP1461609 A1 EP 1461609A1 EP 02792623 A EP02792623 A EP 02792623A EP 02792623 A EP02792623 A EP 02792623A EP 1461609 A1 EP1461609 A1 EP 1461609A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
electrode
measuring
gas probe
probe according
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Withdrawn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
EP02792623A
Other languages
German (de)
English (en)
Inventor
Lothar Diehl
Bernd Schumann
Frank Stanglmeier
Johann Riegel
Eberhard Schnaibel
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 EP1461609A1 publication Critical patent/EP1461609A1/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Withdrawn legal-status Critical Current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
    • G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure
    • 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
    • G01N27/4067—Means for heating or controlling the temperature of the solid electrolyte

Definitions

  • the invention is based on an exhaust gas probe for measuring oxygen in an exhaust gas according to the type defined in more detail in the preamble of claim 1.
  • Such an exhaust gas probe which is referred to as a broadband lamda probe, is, for example, from Bosch ' "Automotive ' Tachenbuch", 22nd edition, 1998, p. 492 f. or ' the • DE 199 41 051 AI known.
  • the Breitbandlamdasonde has a Nernst Kohzentrationszelle and a pumping cell and egg ⁇ NEN with the surrounding gas atmosphere associated., Designed as a measuring chamber to the measuring gap.
  • the pump cell pumps oxygen out of the measuring gap. If, on the other hand, the measuring gap is exposed to a rich exhaust gas, oxygen is pumped from the surrounding exhaust gas by decomposition of C0 2 and H 2 0 into the measuring gap by means of the pump cell. In this case, the direction of the measured current is reversed to the current direction in the case of a lean exhaust gas.
  • the pump current is proportional to the oxygen concentration or • to the oxygen requirement.
  • the broadband lamda probe has an operating temperature of at least 600 ° C, which can be set using an " integrated heater " .
  • So-called HC sensors are used to measure the hydrocarbon content of an exhaust gas, which are arranged in an exhaust line downstream or upstream of a catalytic converter.
  • ER is used to detect and measure zth not umgeset by means of the catalyst of P ⁇ est-Kohlenwasserstof fanteils the exhaust gas.
  • DE 197 57 112 C2 discloses a gas sensor for measuring the air / fuel ratio ⁇ , which is designed as a two-point probe and is designed with a catalytically inactive electrode by means of which a carbon-hydrogen concentration in an exhaust gas is determined can be.
  • the hydrocarbon signal determined by means of an HC sensor depends on the concentration of oxygen in the exhaust gas in question.
  • An oxygen concentration gig ⁇ correction of the hydrocarbon signal is not possible with the gas sensor known from DE 197 57 112 C2.
  • the exhaust gas probe for measuring oxygen in an exhaust gas with the features according to the preamble of claim 1, in which at least one HC electrode is arranged on the outside of the layered structure for measuring a hydrocarbon content of the exhaust gas, has the advantage that the 'corrected detected signal in response to the oxygen content of the exhaust gas by means of the so-called HC-electrode for measurement of Hydrocarbons solid content and the.
  • Oxygen content and the hydrocarbons sto 'ffgehalt of the exhaust gas at the same time upstream of a catalytic converter which is arranged in an exhaust line of a motor vehicle, can be ge messenger-. This is particularly advantageous in an internal combustion engine in which misfires occur which lead to an increased hydrocarbon content upstream of the catalytic converter. Such increased concentrations of hydrocarbon in the exhaust gas occur in particular shortly after the misfire occurred. These misfires can be detected by means of the HC sensor for diagnostic purposes.
  • the exhaust gas probe according to the invention which forms an integrated probe with an oxygen sensor and an HC sensor for measuring the hydrocarbon content, which is determined by means of the HC electrodes. te measurement signal before ignition compared with the measurement signal determined shortly after this ignition.
  • the arrangement of the HC electrode for measuring the hydrocarbon content of the exhaust gas on an essentially known broadband lamna probe, for example comprising three or four solid-state electrolyte layers, which comprises an oxygen pump cell and a Nernst concentration cell, is an inexpensive possibility , the aforementioned diag-
  • the exhaust gas probe according to the invention can be provided with a 6-cable connection, which
  • the HC electrode is operated at a temperature of about 60 ° C. This operating temperature can
  • the HC electrode is heated by means of a heater, which is preferably also the heater for operating the oxygen sensor unit, which consists of the oxygen pump cell and the Nernst concentration cell.
  • the HC electrode for measuring the hydrocarbon content can also be operated at a temperature that is above 600 ° C. It is understood that in this case the material from which the HC electrode is made must support this operating temperature.
  • the HC electrode can consist of a catalytically inactive material, for example a Pt / Au alloy.
  • the additional HC electrode is advantageously printed on an essentially conventional broadband lamda probe with a heater on the side on which the heater is arranged.
  • the HC electrode can then be electroplated provided with .Gold and alloyed using an annealing process.
  • the temperature can also be controlled via the internal resistance of the so-called Nernst concentration cell, so that the suitable operating temperature for the HC electrode is reached.
  • the electrode for measuring the hydrocarbon content is arranged outside a so-called "hot spot" area of a heater.
  • the "hot spot" area of the heater is the area of the exhaust gas probe in which the heater is located causes highest temperatures. Placing the HC probe outside of this range can easily
  • the electrode for measuring the hydrocarbon content has a low-resistance feed line.
  • the lead of the HC electrode is usually also printed on the outside of the layered structure.
  • a low-resistance supply line can then be achieved by increasing the thickness of the supply line, for example by means of a double pressure structure.
  • the electrode for measuring the hydrocarbon content is advantageously provided with a protective layer made of a porous material.
  • a suitable porous material in this application is zirconium dioxide.
  • the HC electrode can be provided with a simple protective layer of this type.
  • the layered structure Of the solid electrolyte layers ⁇ consists in particular of so-called carrier foils, which consist of yttrium-stabilized zirconium dioxide.
  • the electrode-HC then look at the outside of one of these ceramic carrier films disposed of, for example three or administratla- ⁇ Gigen structure.
  • the supply line to the electrode for measuring the hydrocarbon content can be insulated on both sides in accordance with a supply line to the external pump electrode of the exhaust gas probe. This ensures that one that arises during sintering Curvature of the HC sensor element in the case of different sintering shrinkage of the insulation, which can consist of aluminum oKid, and the carrier film consisting, for example, of yttrium-stabilized zirconium dioxide is reduced.
  • the double-sided insulation of the lead of the HC electrode only requires an additional pressure step in the manufacture of the exhaust gas probe according to the invention, since the associated contact contacts must be insulated on the underside anyway.
  • the HC electrode can be arranged on the side on which the oxygen sensor unit is also located; H. on the side of the outer pump electrode.
  • the lead of the HC electrode can be provided with a through-contacting connection.
  • the plated-through hole can pass through several layers of the layered structure.
  • Show it 1 shows a section through an exhaust gas probe according to the invention
  • Figure 2 is a plan view of the exhaust probe of Figure 1 along the arrow II in Figure 1;
  • FIG. 3 shows a section through an alternative embodiment of an exhaust gas probe according to the invention
  • Figure 4 is a plan view of the exhaust gas probe of Figure 3 in the direction of arrow IV in Figure 3;
  • Figure 5 is a plan view of another embodiment.
  • FIGS. 1 and 2 A basic structure of an exhaust gas probe 10 is shown in FIGS. 1 and 2.
  • the exhaust gas probe 10 which is designed as a planar body, is a broadband lambda probe with an essentially conventional layered structure 11 with four ceramic foils, each of which is formed from a solid electrolyte, such as yttrium-stabilized zirconium dioxide.
  • a In the layered structure 11 of the broadband lamna probe 10 is a, provided with a porous diffusion barrier 12, as .
  • Measuring space formed measuring gap 14 is arranged, which is ring-shaped and is exposed via a gas inlet opening 15 oriented perpendicular to the plane of the probe 10 to an exhaust gas flowing in an exhaust line of a motor vehicle, not shown here.
  • the broadband lamda probe 10 includes an air reference channel 16, which is connected to the environment, and "A heater '17 which taktierungen about illustrated in -Figur 2 für- 18 and 19 and contact surfaces 20 and 21 with a non-illustrated power source is connected.
  • a heater '17 which taktierungen about illustrated in -Figur 2 fürkon- 18 and 19 and contact surfaces 20 and 21 with a non-illustrated power source is connected.
  • the heater 17 is the operating temperature of the exhaust gas sensor 10 adjustable.
  • the Breitbandlamdasonde 10 further includes two electrochemical 'cell, namely a so-called oxygen pumping cell having an annular outer pump electrode 22, which surrounds the gas inlet opening 15 and an annular inner pumping electrode 24, and a Nernst Kon ⁇ entra- tion cell, a has annular concentration electrode 26 and a reference electrode 28 delimiting the reference channel 16.
  • the inner pump electrode 24 and the concentration electrode 26 are each arranged opposite one another downstream of the diffusion barrier 12 in the measuring gap 14. , ,
  • the outer pump electrode 22 is provided with an annular porous protective layer 29.
  • the so-called HC electrode 31 is arranged, which is used to measure a carbon water content of the exhaust gas flowing in the exhaust gas line and also to protect against abrasive components of the exhaust gas with a porous protective layer 32 is made of zirconium dioxide.
  • the HC electrode 31 arranged in the effective area of the heater 17 is in one the so-called "hot spot” area of the heater 17.
  • the "hot spot area” is marked "X" in FIG.
  • the broadband lamda probe 10 further comprises a feed line 33 for the HC electrode 31, which is delimited on both sides in accordance with a feed line for the external pump 1 electrode 22 by insulation 34 made of aluminum oxide. Furthermore, an insulation layer 35 is arranged on the side of the HC electrode 31, which is printed with a contact surface 27 for connecting the HC electrode 31 and the contact surfaces 20 and 21 assigned to the heater 17.
  • the outer pump electrode 22, the inner pump electrode 24, the reference electrode 28 and the HC electrode 31 are sintered in a manner known per se with the structure 11 made of the ceramic foils.
  • FIGS. 3 and 4 show an alternative embodiment of an exhaust gas probe 40 according to the invention.
  • the exhaust gas probe 40 differs from that according to FIGS. 1 and 2 in that it consists of a layered structure 41 composed of three solid electrolyte layers and therefore has a compact 3-foil structure.
  • Such a structure of a broadband lamda probe is known from DE 199 41 051 AI.
  • the Nernst concentration cell is arranged behind the pumping cell in the broadband lambda probe 40, which has the outer pumping electrodes 22 and
  • measuring gap 14 and the reference channel are arranged essentially at a height one behind the other.
  • a so-called HC electrode which is fork-shaped and has two legs 43 and 44, is printed on the large surface of the structure 41 of the exhaust gas probe 40 facing away from the outer pump electrode 22.
  • the two legs 43 and 44 of the HC electrode are each provided with a porous protective layer 45 and 46, respectively.
  • This arrangement causes the HC electrode to be arranged outside the so-called “hot spot” area of the heater 17, so that the HC electrode is at a lower temperature, for example about 600 ° C., than that from the pump cell by means of the same heater and the concentration cell existing oxygen measuring unit can be operated, the operating temperature is about 750 ° C.
  • the broadband lamda probe "0 has a low-resistance lead 47 for the HC electrode consisting of the legs 43 and 44.
  • the lead 47 is designed for this purpose as a double-printed conductor and is provided on both sides with an insulating layer made of aluminum oxide.
  • FIG 5 is. another embodiment of an exhaust gas probe 50 according to the invention is shown.
  • the exhaust gas probe 50 differs from that according to FIGS. 3 and 4 in that it is provided with an HC electrode 51.
  • the so-called Nernst concentration cell is arranged below the HC electrode 51 in the interior of the exhaust gas probe 50.
  • the HC electrode 51 is therefore above the area of the exhaust gas probe 50 in which the Ernst concentration point is controlled internally.
  • the temperature-dependent internal resistance of the Nernst concentration cell is regulated to 600 ⁇ or, in an alternative embodiment, to 2000 ⁇ .
  • the internal resistance of the Nernst cell concentration but is regulated to for example, 80 ⁇ and 200 ⁇ .
  • the heater 17 may 3.
  • the heater is clocked with pulse width modulation.
  • the construction of the exhaust gas probe 50 has a low heat capacity, as a result of which a rapid change in temperature can be achieved when the heating output changes.
  • the invention is not featured on the Darge ⁇ embodiments is limited. Rather, for example, the structure shown in FIG. 1 can also be equipped with a " fork-like HC electrode.
  • the fork-shaped HC electrode of the exemplary embodiment according to FIGS. 3 and 4 can also be replaced by an HC electrode corresponding to that according to FIG. 1.

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

L'invention concerne une sonde à oxygène destinée à mesurer la teneur en oxygène des gaz d'échappement. Cette sonde se présente sous la forme d'une construction en couches (11) comportant des couches d'électrolyte solide et contenant une cavité de mesure (14) exposée aux gaz d'échappement, au moins une électrode de pompage interne (24) qui est logée dans la cavité de mesure (14), au moins une électrode de pompage externe (22) qui coopère avec l'électrode de pompage interne (24) et qui est plaquée sur le côté externe de la construction en couches (11), et un canal de référence abritant une électrode de référence. Au moins une électrode HC (31) destinée à mesurer la teneur en hydrocarbures de gaz d'échappement est plaquée sur le côté externe de la construction en couches (11).
EP02792623A 2001-12-22 2002-11-29 Sonde a oxygene destinee a des gaz d'echappement Withdrawn EP1461609A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10163942 2001-12-22
DE2001163942 DE10163942A1 (de) 2001-12-22 2001-12-22 Abgassonde
PCT/DE2002/004388 WO2003056323A1 (fr) 2001-12-22 2002-11-29 Sonde a oxygene destinee a des gaz d'echappement

Publications (1)

Publication Number Publication Date
EP1461609A1 true EP1461609A1 (fr) 2004-09-29

Family

ID=7710852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792623A Withdrawn EP1461609A1 (fr) 2001-12-22 2002-11-29 Sonde a oxygene destinee a des gaz d'echappement

Country Status (3)

Country Link
EP (1) EP1461609A1 (fr)
DE (1) DE10163942A1 (fr)
WO (1) WO2003056323A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005049775A1 (de) * 2005-10-18 2007-04-19 Robert Bosch Gmbh Sensor zur Messung der Konzentration einer Gaskomponente in einem Gasgemisch und Verfahren zur Herstellung einer Elektrode eines solchen Sensors
DE102014200481A1 (de) 2014-01-14 2015-07-16 Robert Bosch Gmbh Breitbandlambdasonde und Herstellungsverfahren für eine Breitbandlambdasonde

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0684950B2 (ja) * 1987-03-03 1994-10-26 日本碍子株式会社 電気化学的装置
JP3863974B2 (ja) * 1996-10-31 2006-12-27 株式会社日本自動車部品総合研究所 ガス検出装置
JP3540177B2 (ja) * 1998-12-04 2004-07-07 日本特殊陶業株式会社 ガスセンサ及びそれを用いた可燃性ガス成分濃度測定装置
JP3686272B2 (ja) * 1998-12-21 2005-08-24 株式会社日立製作所 空燃比センサ及びこれを用いたエンジン燃焼制御システム
DE19941051C2 (de) * 1999-08-28 2003-10-23 Bosch Gmbh Robert Sensorelement zur Bestimmung der Sauerstoffkonzentration in Gasgemischen und Verfahren zur Herstellung desselben

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO03056323A1 *

Also Published As

Publication number Publication date
WO2003056323A1 (fr) 2003-07-10
DE10163942A1 (de) 2003-07-10

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