EP1105720A1 - Procede et dispositif pour etalonner un systeme de sonde constitue d'une sonde pour gaz d'echappement et d'un circuit de regulation pour un vehicule automobile - Google Patents

Procede et dispositif pour etalonner un systeme de sonde constitue d'une sonde pour gaz d'echappement et d'un circuit de regulation pour un vehicule automobile

Info

Publication number
EP1105720A1
EP1105720A1 EP99952345A EP99952345A EP1105720A1 EP 1105720 A1 EP1105720 A1 EP 1105720A1 EP 99952345 A EP99952345 A EP 99952345A EP 99952345 A EP99952345 A EP 99952345A EP 1105720 A1 EP1105720 A1 EP 1105720A1
Authority
EP
European Patent Office
Prior art keywords
control circuit
test
values
probe
microcontroller
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Withdrawn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
EP99952345A
Other languages
German (de)
English (en)
Inventor
Markus Amtmann
Stephan Bolz
Jürgen RÖSSLER
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 EP1105720A1 publication Critical patent/EP1105720A1/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Withdrawn legal-status Critical Current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
    • G01N27/4175—Calibrating or checking the analyser

Definitions

  • Method and device for calibrating a probe system consisting of an exhaust gas probe and a control circuit for a motor vehicle
  • the invention relates to a method and a device for calibrating a probe system, consisting of an exhaust gas probe and a control circuit for a motor vehicle.
  • NO x sensor It is known to use thick-film sensors to measure the concentration of pollutants in the exhaust gas of an internal combustion engine. Such a sensor is described using the example of a NO x sensor in N. Kato et al., "Performance of Thick Film NO x sensor on Diesel and Gasoline Engines", Society of Automotive Engineers, publication 970858, 1997.
  • This NO x sensor has two measuring cells and three oxygen pumping cells and realizes the following measuring concept: In a first measuring cell, to which the gas to be measured is supplied via a diffusion barrier, a first oxygen concentration is set by means of a first oxygen-ion pumping current, whereby no decomposition of NO x takes place.
  • the oxygen content is further reduced by means of a second oxygen-ion pumping current and NO x is decomposed at a measuring electrode.
  • the oxygen generated in this way is recorded as a measure of the NO x concentration.
  • the entire NO x sensor is heated to an elevated temperature, e.g. B. 700 ° C brought.
  • the invention is based on the technical problem of developing a method which makes it possible to individually calibrate exhaust gas probes together with the associated control circuit at the end of the production process and in the course of their service life, and to compensate for component tolerances in the control circuit.
  • the problem is solved by a method having the features of patent claim 1 and by a device according to patent claim 8.
  • Advantageous further developments of the invention are laid down in the subclaims. If a microcontroller is used in connection with an analog circuit to regulate the pump currents, it is possible to save application-specific data of the probe system.
  • the measured values recorded under specified test conditions are stored in a programmable read-only memory, for example an EPROM, which is preferably integrated in the microcontroller, as correction or test values.
  • the test values then serve as a reference for an independent recalibration of the probe system during the lifetime.
  • the correction values are used to compensate for further component tolerances, such as offset voltages from operational amplifiers.
  • FIG. 1 shows a schematic sectional illustration of a NO x sensor
  • FIG. 2 shows a block diagram of a circuit arrangement for regulating a pump current
  • Figure 3 is a schematic representation of an arrangement for
  • Thick film NO x sensors consist of a multilayer, sintered ceramic substrate. In the manufacturing process, several electrodes are applied to the individual ceramic carriers. These electrodes form the pump and measuring cells required to implement a NO x sensor. The electrical properties of the electrodes and the ceramic substrate change during the sintering process and over time.
  • a NO x sensor 1 (FIG. 1) consisting of a solid electrolyte 2, in this case zirconium dioxide, takes over one first diffusion barrier 3 on the exhaust gas to be measured.
  • the exhaust gas diffuses through the diffusion barrier 3 into a first measuring cell 4.
  • the oxygen content in this measuring cell is measured by means of a first Nernst voltage VNO between a first pump electrode 5 and a reference electrode 6 exposed to ambient air.
  • the reference electrode 6 is arranged in an air channel 7, into which ambient air passes through an opening 8. Both electrodes 5, 6 are conventional platinum electrodes.
  • the measured value of the first Nernst voltage VNO is used to set a first control voltage VpO.
  • the control voltage VpO drives a first oxygen ion pump current IpO through the solid electrolyte 2 of the NO x sensor 1 between the first pump electrode 5 and an outer electrode 9 - the pump electrode 5 and the outer electrode 9 form a first pump cell.
  • the control voltage VpO is set by a controller so that there is a predetermined oxygen concentration in the first measuring cell 4.
  • the first measuring cell 4 is connected to a second measuring cell 10 via a second diffusion barrier 11. Through this diffusion barrier 11, the gas present in the measuring cell 4 diffuses into the second measuring cell 10.
  • the second oxygen concentration in the second measuring cell 10 is via a second Nernst voltage VN1 between a second pump electrode 12, which is also a platinum electrode, and the reference electrode 6 measured and used by a controller to specify a second control voltage Vpl, which drives a second oxygen ion pump current Ipl.
  • the second oxygen ion pump current Ipl from the second measuring cell 10 flows from the second pump electrode 12 through the solid electrolyte 2 to the outer electrode 9 (second pump cell). With his help a predetermined oxygen concentration is set in the second measuring cell 10.
  • a third oxygen concentration is measured via a third Nernst voltage VN2 between the measuring electrode 13 and the reference electrode 6 and used by a controller to specify a third control voltage Vp2.
  • Vp2 is applied between the measuring electrode 13 and the outer electrode 9 (third pump cell)
  • the N0 x is decomposed and the oxygen released is pumped through the solid electrolyte 2 to the outer electrode 9 in a third oxygen-ion pumping current Ip2.
  • the ion pump current Ip2 is carried only by oxygen ions which originate from the decomposition of N0 x . It is therefore a measure of the NO x concentration in the measuring cell 10 and thus in the exhaust gas to be measured. Since such NO x sensors have a strong temperature dependence, a heating element 14 ensures that the probe temperature is always kept in a predetermined temperature range in order to maintain the necessary measurement accuracy.
  • a microcontroller 20 in conjunction with an analog circuit 21 is used to regulate the pump currents.
  • the circuit arrangement of an individual pump current control circuit is shown in detail in FIG.
  • the control circuit of the entire NO x sensor has such a circuit arrangement for each pump cell to be controlled.
  • the required digital circuit components can be implemented within a single microcontroller 20.
  • a PWM unit 22 in the microcontroller 20 generates a pulse-width-modulated signal, which with the aid of an analog filter circuit 23 in a DC voltage is converted. Depending on the requirements of the required current strength, this voltage is given either directly or via an impedance converter 24 to a measuring resistor 25, which is connected in series with the pump cell 27 of the NO x sensor 1 to be controlled.
  • the pump cell is in the form of a
  • the voltage potentials before and after the measuring resistor 25 are read alternately via a multiplexer 31. Since the input of the NO x sensor 1 is usually very high-resistance, an impedance converter 32, for example a buffer amplifier, can be connected into the measuring line, which is used to measure the potential value after the measuring resistor 25.
  • an impedance converter 32 for example a buffer amplifier
  • the Nernst voltages required to regulate the pump current are also calculated in the microcontroller 20.
  • both the Nernst potential V Nerns and the reference potential V Ref of the corresponding measuring cell 33 of the NO x sensor 1 are read in by a second A / D converter 34 in the microcontroller 20.
  • the measuring cell 33 corresponds to either the first measuring cell 4 or the second measuring cell 10 from FIG. 1 and is shown schematically as a DC voltage source.
  • two impedance converters 35 and 36 are also provided here, for example in the form of buffer amplifiers.
  • a pump current difference .DELTA.Ip is calculated within the microcontroller 20 from the read potential values.
  • B a PID controller, which controls the PWM unit 22.
  • a programmable read-only memory 39 for example an EPROM, which is preferably integrated in the microcontroller, serves to store the potentials read in on the A / D converters 30 and 34.
  • a probe system 50 consisting of a NO x probe 51 and the associated control circuit 52, is calibrated with the arrangement according to FIG. 3.
  • the NO x probe 51 is composed of the NO x sensor 1, a sensor line 53 and a sensor plug 54.
  • the arrangement of the control circuit 52 in the housing of the sensor connector 54 results in very short connecting lines. In this way, despite the line losses that occur, a sufficiently precise transmission of the signal currents, which are usually only in the nA range, can be ensured.
  • the test parameters for example NO x concentration and gas temperature, are set and monitored in a test chamber 56 by a test control computer 55.
  • the NO x sensor 1 records the corresponding measured values and forwards them to the control circuit 52 via the sensor line 51.
  • the control circuit 52 the measured values present at the A / D converters of the microcontroller 20 are stored either directly or after an internal evaluation, for example by comparison with predetermined target values, in characteristic maps made available for this purpose in the programmable read-only memory 39.
  • the communication with the test control computer 55 necessary for controlling the control circuit 52 takes place via a serial interface 57 integrated in the control circuit and a data line 58.
  • the individual pump current control circuits must be measured under different, characteristic operating conditions after completion of the probe system, i.e. after connecting the NO x probe to the associated control circuit.
  • Offset voltages the probe system is first tested under electrically neutral test conditions. For this purpose, the heating element is switched off and on The duty cycle of the pulse width modulated signal is set to 0% so that no pump current flows.
  • the values now read by the A / D converters correspond exactly to the offset voltages present. These can be stored as correction values in the programmable read-only memory 39 and can be used to coordinate the respective pump currents.
  • This compensation can also be repeated after the control system has been installed in a motor vehicle, for example at the request of the central engine control or in the course of an inspection in a workshop.
  • Each pump current control loop of the probe system is then tested successively under different test conditions.
  • the pump currents determined in this case - ie the measured values applied to the first A / D converter 30 - are stored in the read-only memory 39 and subsequently serve as a reference for regular, independent recalibration of the system over the course of its service life.
  • the Nernst and reference potentials present at the second A / D converter 34 can also be stored in the read-only memory 39.
  • a / D converters can read and store various application-specific data from the probe system. In this way, each probe system can be calibrated individually and fully automatically at the end of the manufacturing process using a test facility. A complex and costly comparison of electronic components, as would be necessary with a purely analog control circuit, can be avoided in this way. Due to the possibility of independent recalibration of the probe system, the circuit design of the control circuit is largely independent of component tolerances.
  • the invention has been described by way of example for a NO x sensor; corresponding methods and devices are also available for others based on the principle of galvanic acid Material concentration cell with solid electrolyte exhaust gas probes, such as linear oxygen probes, suitable.

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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

Le circuit de régulation (52) d'une sonde pour gaz d'échappement comporte un microcontrôleur (20) fonctionnant en liaison avec des montages analogiques (21). Des valeurs de mesure relevées dans des conditions d'essai prédéfinies dans une chambre d'essai (56) sont mémorisées dans des champs caractéristiques d'une mémoire morte programmable (39). Ces valeurs servent ensuite de référence pour un post-étalonnage ultérieur du système de sonde.
EP99952345A 1998-08-10 1999-08-10 Procede et dispositif pour etalonner un systeme de sonde constitue d'une sonde pour gaz d'echappement et d'un circuit de regulation pour un vehicule automobile Withdrawn EP1105720A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19836127A DE19836127A1 (de) 1998-08-10 1998-08-10 Verfahren und Vorrichtung zum Kalibrieren eines Sondensystems, bestehend aus einer Abgassonde und einer Regelschaltung für ein Kraftfahrzeug
DE19836127 1998-08-10
PCT/DE1999/002490 WO2000010002A1 (fr) 1998-08-10 1999-08-10 Procede et dispositif pour etalonner un systeme de sonde constitue d'une sonde pour gaz d'echappement et d'un circuit de regulation pour un vehicule automobile

Publications (1)

Publication Number Publication Date
EP1105720A1 true EP1105720A1 (fr) 2001-06-13

Family

ID=7877042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99952345A Withdrawn EP1105720A1 (fr) 1998-08-10 1999-08-10 Procede et dispositif pour etalonner un systeme de sonde constitue d'une sonde pour gaz d'echappement et d'un circuit de regulation pour un vehicule automobile

Country Status (4)

Country Link
US (1) US6347277B2 (fr)
EP (1) EP1105720A1 (fr)
DE (1) DE19836127A1 (fr)
WO (1) WO2000010002A1 (fr)

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DE10224055B4 (de) * 2002-05-31 2007-12-27 Robert Bosch Gmbh Verfahren zum Kalibrieren eines Sensorelements für eine Grenzstromsonde
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DE10322276A1 (de) * 2003-05-16 2004-12-02 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Adapter für modulare Messumformer
DE102005032456A1 (de) * 2005-07-12 2007-01-25 Robert Bosch Gmbh Verfahren zur Dynamikdiagnose einer Abgassonde
DE102006006552B8 (de) * 2006-02-13 2007-06-06 Siemens Ag Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine
DE102007043728A1 (de) * 2007-09-13 2009-04-09 Continental Automotive Gmbh Abgassonde und Verfahren zu deren Betrieb
DE102008020651B3 (de) 2008-04-24 2009-12-31 Continental Automotive Gmbh Ansteuerschaltung für einen elektrochemischen Gassensor und Verfahren zum Einstellen eines elektrochemischen Gassensors
CN101482531B (zh) * 2009-01-10 2012-05-16 大连理工大学 一种用于可燃气体探测器的基线漂移自适应补偿探测方法
DE102009026418B4 (de) 2009-05-22 2023-07-13 Robert Bosch Gmbh Konditionierung eines Sensorelements in einem Brennerprüferstand bei mindestens 1000°C und Konditionierungsstrom
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Also Published As

Publication number Publication date
US20010023386A1 (en) 2001-09-20
WO2000010002A1 (fr) 2000-02-24
US6347277B2 (en) 2002-02-12
DE19836127A1 (de) 2000-02-24

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