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WO1990003569A1 - Detecteur rapide a compensation thermique, en particulier pour l'oxygene et les gaz d'echappement de voitures - Google Patents

Detecteur rapide a compensation thermique, en particulier pour l'oxygene et les gaz d'echappement de voitures Download PDF

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Publication number
WO1990003569A1
WO1990003569A1 PCT/DE1989/000609 DE8900609W WO9003569A1 WO 1990003569 A1 WO1990003569 A1 WO 1990003569A1 DE 8900609 W DE8900609 W DE 8900609W WO 9003569 A1 WO9003569 A1 WO 9003569A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistor
temperature
metal oxide
shunt resistor
sensor
Prior art date
Application number
PCT/DE1989/000609
Other languages
German (de)
English (en)
Inventor
Josef Gerblinger
Hans Meixner
Peter Kleinschmidt
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1990003569A1 publication Critical patent/WO1990003569A1/fr

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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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits
    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/045—Circuits
    • G01N27/046—Circuits provided with temperature compensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
    • G01N33/0034—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array comprising neural networks or related mathematical techniques

Definitions

  • the present invention relates to a sensor with the features of the preamble of claim 1.
  • thermocouples or sensors for temperature measurement in relevant measuring devices and to carry out corresponding measured value corrections.
  • DE-A-2 942 983 discloses a gas component measuring device with a bridge circuit. Two of the bridge resistors are sensors that must have different response time constants and the same temperature coefficients.
  • the sensor according to the invention is a fast or rapidly responding, temperature-compensated sensor, in particular partial pressure meter for preferably oxygen. It is particularly suitable for use in automotive technology for the qualitative and, in particular, quantitative detection of oxygen in car exhaust.
  • So-called lambda probes are already known, with which car exhaust gases are measured or monitored to determine whether or to what extent the air-fuel mixture supplied to the engine has a predetermined or optimal composition.
  • the object of the present invention is to provide a sensor with which the oxygen partial pressure in the exhaust gas can be measured or monitored with response times in the range of milliseconds. This task is particularly aimed at creating such a sensor that can be used advantageously for cylinder-selective engine control. This object is achieved with the invention according to claim 1.
  • the starting point of the invention is that cylinder-selective engine control cannot be implemented with the conventional lambda probes, since these sensors have response times which are too short.
  • the known lambda probes are also too temperature-dependent to meet the task at hand.
  • the exhaust gas temperatures are within a relatively large temperature range for the solution of the task, namely depending on the operating phase and load on the engine.
  • the position of the intended mounting of the probe in the path of the exhaust gas from the engine to the final silencer must also be taken into account.
  • the invention is based on the fact that known lambda probes or oxygen detectors are temperature-dependent.
  • the inventors have found that the respective sensors, in particular sensors, which have essentially thin ceramic metal oxide layers as sensor elements, have different temperature responses.
  • FIG. 3 shows the circuit diagram of a circuit which has compensation for the temperature responses of the two (R, R 2 ) ceramic resistors used for the sensor, known per se or known to be used.
  • R ⁇ and R p denote a first and a second shunt resistor.
  • U Q is the DC supply voltage and U 2 is the measured value signal. It can be shown mathematically that, taking into account the material conditions, the measured-value voltage U 2 in a predeterminable temperature range only depends on the oxygen partial pressure and no longer on the temperature of the sensor, ie the otherwise disruptive temperature response of an oxygen sensor is eliminated .
  • the invention is based on the fact that a resistor with sensor properties for oxygen, i.e. such as The above-mentioned doped metal oxide resistance with regard to its dependencies on the partial pressure and on the temperature can be stated as:
  • shunt resistors are expediently assigned to the same resistor R-, (P, T) (as the figure shows).
  • the measure according to the invention is a, however very good, approximation to the temperature independence and the series shunt resistance extends the temperature range of the temperature dependence to the lower temperatures, whereas the parallel shunt resistance favors the range of the higher temperatures.
  • One or the two shunt resistors R s , R p are assigned to the temperature-dependent resistor R (P, T) which has the higher temperature coefficient K.
  • the shunt resistors R ⁇ and R p are expediently arranged outside the temperature effects caused by the exhaust gases.
  • the respective dimensioning of the resistors R ⁇ and R p naturally depends on the size of the resistors R ⁇ R 2 . According to the applicable mathematical relationship for this bridge circuit with series or parallel shunt resistance, it can be determined with the aid of a computer by iteration. As a rule, however, it is sufficient to find suitable resistance values for the intended series shunt resistor R ⁇ and / or possibly provided parallel shunt resistor R p by simple practical experiment with the knowledge of the invention and its objective.
  • the gradient of the oxygen partial pressure dependence of the Metal oxide resistors R ,, R 2 depends on whether there is donor or acceptor conductivity. Donor conductivity of one resistor R. and acceptor conductivity of the other resistor R. must be provided. Accordingly, the invention can advantageously also be used for those other gases in which there is a similar dependence on the metal oxide, namely the opposite gradient of the dependence of the electrical conductivity of the metal oxide on the partial pressure of the gas in question.
  • FIG. 3 shows a differential circuit in the manner of a complete bridge circuit in which the second bridge branch is missing.
  • the circuit according to Figure 3 can also be used for a complete bridge circuit by e.g. two further resistors can be added.
  • Rapid response or high response speed can be achieved if the oxide resistors are designed as thin-film resistors or sensors.
  • response time constants of less than 5 ms can be achieved, 90% of the asymtotic value being taken as the basis for the sensor measurement quantity achieved. This is the T 90 value.
  • Such a short time constant is sufficient for cylinder-selective measurement in a 6-cylinder engine. Any different time constants of the two resistors are irrelevant as long as the response time constants are below, for example, 5 ms for the application of a 6-cylinder engine or below a corresponding value of another application.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Evolutionary Computation (AREA)
  • Artificial Intelligence (AREA)
  • Mathematical Physics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

Détecteur quantitatif d'oxygène pour gaz d'échappement de voitures comportant deux résistances en oxyde métallique (R1, R2) dont l'une est reliée à une résistance shunt (RS, RP) pour la compensation thermique.
PCT/DE1989/000609 1988-09-30 1989-09-28 Detecteur rapide a compensation thermique, en particulier pour l'oxygene et les gaz d'echappement de voitures WO1990003569A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3833295.7 1988-09-30
DE19883833295 DE3833295A1 (de) 1988-09-30 1988-09-30 Schneller, temperaturkompensierter sensor, insbesondere fuer sauerstoff und fuer autoabgase

Publications (1)

Publication Number Publication Date
WO1990003569A1 true WO1990003569A1 (fr) 1990-04-05

Family

ID=6364103

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000609 WO1990003569A1 (fr) 1988-09-30 1989-09-28 Detecteur rapide a compensation thermique, en particulier pour l'oxygene et les gaz d'echappement de voitures

Country Status (2)

Country Link
DE (1) DE3833295A1 (fr)
WO (1) WO1990003569A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992021018A1 (fr) * 1991-05-18 1992-11-26 Capteur Sensors & Analysers Ltd. Detecteur de gaz
WO1993008467A1 (fr) * 1991-10-24 1993-04-29 Capteur Sensors & Analysers Ltd. Detection de substances gazeuses

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19531202C2 (de) * 1995-08-24 1998-05-14 Siemens Ag Anordnung zur Messung des Sauerstoffgehaltes in brennbaren strömenden Medien, des Verhältnisses von Sauerstoff und brennbarem strömendem Medium sowie zur Messung von brennbaren Gasen in Luft
DE19830709C2 (de) * 1998-07-09 2002-10-31 Daimler Chrysler Ag Meßwandler zur Detektion von Kohlenwasserstoffen in Gasen
ATE408819T1 (de) * 2004-06-03 2008-10-15 Ust Umweltsensortechnik Gmbh Vorrichtung und verfahren zur detektion von leichtflüchtigen organischen verbindungen
US7737700B2 (en) 2005-11-23 2010-06-15 Ust Umweltsensortechnik Gmbh Arrangement and method for detecting air ingredients

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385096A1 (fr) * 1977-03-22 1978-10-20 Renault Sonde de dosage d'un composant de flux gazeux
GB2002124A (en) * 1977-07-26 1979-02-14 Fuji Electric Co Ltd Carbon monoxide detecting apparatus
GB2005026A (en) * 1977-09-26 1979-04-11 Bendix Autolite Corp Method and apparatus for measuring the o2 contend of a gas
US4233033A (en) * 1979-09-19 1980-11-11 Bendix Autolite Corporation Method and apparatus for measuring the O2 content of a gas
EP0077724A1 (fr) * 1981-10-16 1983-04-27 Association Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels (Armines) Procédé, capteur et dispositif de détection de traces de gaz dans un milieu gazeux
GB2158246A (en) * 1984-03-28 1985-11-06 Sharp Kk Sensor temperature compensation

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DE2065023A1 (de) * 1970-04-06 1972-03-02 Taguchi N Gasspürgerät
JPS5558447A (en) * 1978-10-25 1980-05-01 Nippon Soken Inc Gas constituent detector
US4377944A (en) * 1979-12-27 1983-03-29 Nippon Electric Co., Ltd. Integrated gas sensitive unit comprising a gas sensitive semiconductor element and a resistor for gas concentration measurement
DE3104986A1 (de) * 1981-02-12 1982-08-19 Bosch Gmbh Robert Polarographischer messfuehler fuer die bestimmung des sauerstoffgehaltes in gasen
JPS5819553A (ja) * 1981-07-27 1983-02-04 Nippon Denso Co Ltd 多機能酸素濃度検出器
DE3322534A1 (de) * 1983-06-23 1985-01-10 Robert Bosch Gmbh, 7000 Stuttgart Widerstandsmessfuehler
DE3442295C2 (de) * 1984-11-20 1986-10-02 Karl Dungs Gmbh & Co, 7067 Urbach Verfahren zur Bestimmung des Sauerstoffgehaltes gasförmiger oder flüssiger Medien und Meßsonde zur Durchführung des Verfahrens
JPH0697220B2 (ja) * 1986-05-08 1994-11-30 株式会社日立製作所 空燃比検出装置
US4784728A (en) * 1987-06-23 1988-11-15 Ametek, Inc. Oxygen measuring apparatus and method with automatic temperature compensation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385096A1 (fr) * 1977-03-22 1978-10-20 Renault Sonde de dosage d'un composant de flux gazeux
GB2002124A (en) * 1977-07-26 1979-02-14 Fuji Electric Co Ltd Carbon monoxide detecting apparatus
GB2005026A (en) * 1977-09-26 1979-04-11 Bendix Autolite Corp Method and apparatus for measuring the o2 contend of a gas
US4233033A (en) * 1979-09-19 1980-11-11 Bendix Autolite Corporation Method and apparatus for measuring the O2 content of a gas
EP0077724A1 (fr) * 1981-10-16 1983-04-27 Association Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels (Armines) Procédé, capteur et dispositif de détection de traces de gaz dans un milieu gazeux
GB2158246A (en) * 1984-03-28 1985-11-06 Sharp Kk Sensor temperature compensation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992021018A1 (fr) * 1991-05-18 1992-11-26 Capteur Sensors & Analysers Ltd. Detecteur de gaz
WO1993008467A1 (fr) * 1991-10-24 1993-04-29 Capteur Sensors & Analysers Ltd. Detection de substances gazeuses

Also Published As

Publication number Publication date
DE3833295A1 (de) 1990-04-05

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