WO2012136715A1 - Procédé servant à faire fonctionner une sonde lambda à large bande - Google Patents

Procédé servant à faire fonctionner une sonde lambda à large bande Download PDF

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Publication number
WO2012136715A1
WO2012136715A1 PCT/EP2012/056189 EP2012056189W WO2012136715A1 WO 2012136715 A1 WO2012136715 A1 WO 2012136715A1 EP 2012056189 W EP2012056189 W EP 2012056189W WO 2012136715 A1 WO2012136715 A1 WO 2012136715A1
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WO
WIPO (PCT)
Prior art keywords
pumping
voltage
pump
current
cell
Prior art date
Application number
PCT/EP2012/056189
Other languages
German (de)
English (en)
Inventor
Claudius Bevot
Bertrand Eric MELI
Thomas Schulz
Jens Wagner
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 WO2012136715A1 publication Critical patent/WO2012136715A1/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
    • G01N27/26—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

Definitions

  • the invention relates to a method for operating a broadband lambda probe according to the preamble of claim 1.
  • 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.
  • Lambda sensors with two cells as they emerge for example from DE 10 2007 057 707 A1. These probes are used to measure the concentration of a gas component in the exhaust gas of the internal combustion engine.
  • Broadband lambda probes basically consist of a combination of a conventional concentration probe (Nernst probe), which acts as a galvanic cell, and a limiting current or "pumping cell.”
  • Exhaust gas becomes oxygen by reversing the pumping voltage fed.
  • the respective pumping current forms the output signal.
  • the output signal line of such broadband lambda probes is connected to the engine control unit.
  • the setpoint of the Nernst voltage is regulated by the pumping current. It should be noted that the pump voltage does not exceed a certain threshold, otherwise the probe will be destroyed. If the pumping voltage is too high, blackening of the probe may occur.
  • the pumping voltage regulated by the above-described pumping current regulator is monitored and limited in probes of today's design.
  • the polarization of the probe is crucial.This polarization can be advantageously determined by the applied pumping voltage, while no pumping current flows. This state is referred to below as “de-energized pumping voltage”.
  • the polarization of the probe is in other words by the unpowered
  • the invention is based on the object of providing a method for operating a broadband lambda probe, which enables protection of a regulated broadband lambda probe from excessively high pumping voltage.
  • Lambda probe solved with the features of claim 1.
  • the basic idea of the invention is to base the unthrottled pumping voltage on the protective function of the broadband lambda probe described in more detail below.
  • One way to measure the de-energized pumping voltage is to use the
  • the pump voltage is compared with a predetermined maximum threshold value.
  • the pump current regulator for the control to its nominal value, the so-called Nernst voltage, and a separate monitoring of the pump voltage, the probe can be operated up to the maximum permitted unpowered pumping voltage.
  • the pumping current regulator When the threshold value is exceeded, the pumping current regulator is deactivated and either the pumping current is switched off or the pumping current is regulated by means of a separate regulator, also referred to below as “blackening protection regulator", so that the pumping voltage lies within specifiable limits Wide-band lambda probe within the predetermined allowable limits for the de-energized pump voltage continue to operate.
  • the pump voltage is adjusted by the pump current controller so that it is between a minimum and a maximum pump voltage limit.
  • the minimum and maximum pump voltage limit values are preferably determined separately for rich and lean operating ranges, taking into account a hysteresis, and predefined.
  • the threshold values are therefore separately adjustable for the two operating ranges “rich” and “lean” and are provided with an adjustable hysteresis.
  • the threshold values or the hysteresis depend on the probe type. They are freely adjustable via a data register within the evaluation range of an analog-to-digital converter with a specific resolution.
  • a particularly preferred embodiment provides that when the pump voltage falls below the maximum predetermined threshold again, a control by means of the pump current regulator is made again. Thus, if the pump voltage threshold which is dangerous for the probe has again fallen below, the control takes place in a manner known per se, the pump current regulator being configured such that the control starts immediately.
  • Measurement of the pumping voltage can be done, for example, that the Pumping current is turned off for a predetermined time and in this current pause the voltage between the outer pumping electrode and the inner pumping electrode is measured.
  • the above-described method steps can be designed purely in principle as a computer program which runs in a control unit program, for example as a subroutine.
  • the program code is advantageously stored on a computer program code, for example a DVD, a CD-ROM, an external drive, a flash memory or the like, and in this way it is readily possible to retrofit the method into existing control devices without additional hardware expenditure.
  • the separate controller ie the blackening protection controller, can be implemented as a computer program.
  • Fig. 2 shows schematically an equivalent circuit diagram of the broadband lambda probe for explaining the method according to the invention
  • Fig. 3 the pump voltage over time to explain the method according to the invention.
  • Gas sensors of different types are used to determine the gas composition in the exhaust gas of internal combustion engines, in particular of internal combustion engines in motor vehicles.
  • jump probes or lambda probes so-called broadband lambda probes are used, in particular for the further lean range.
  • These consist essentially of a combination of conventional, acting as a galvanic cell concentration probe, a so-called Nernst probe, as well as a limiting current or "pump" cell.
  • the method according to the invention will be described below with reference to such a broadband lambda probe.
  • Fig. 1 the structure of such a broadband lambda probe is shown schematically.
  • This comprises a Nernst concentration probe 110 and an oxygen pumping cell 120, wherein the oxygen pumping cell 120 is formed by an outer pumping electrode (APE) 131 and an inner pumping electrode (IPE) 132.
  • the outer pumping electrode 131 is exposed to the exhaust gas A and the inner, annular pumping electrode 132 is arranged in a cavity 133, which is connected to the exhaust gas A via a channel 134 and a diffusion gap in which a diffusion barrier 130 is arranged.
  • the Nernst cell 110 is formed by the inner pumping electrode 132 and a reference electrode (RE) 141 arranged in an inner reference air channel 140.
  • the probe is brought to operating temperature by a heater 150, at which a heating voltage U H is applied.
  • a control circuit 160 formed for example by an operational amplifier, at the noninverting input of a reference voltage Uref of 450 mV particular applies and applied to the inverting input, the output signal of the reference electrode 141, generates a pumping current l P , with which the outer pumping electrode 131 is acted upon.
  • the inner pumping electrode 132 is connected to ground.
  • the pumping current I P can be tapped by means of connection terminals 161, 162. It forms a measure of the oxygen concentration, as briefly described below.
  • To the pumping cell 120 a voltage is applied.
  • the pumping current which can be tapped off via terminals 161, 162, forms the output signal and represents a measure of the oxygen concentration and thus of the lambda value
  • the pump voltage U P is regulated to the Nernst voltage U n , which corresponds to the reference voltage, by means of this pump current regulator
  • the equivalent circuit diagram of the broadband lambda probe is shown schematically in FIG Internal resistance R ie 220 and a fictitious voltage source 221 which provides the Nernst voltage U n o
  • the pumping cell is formed by a fictitious voltage source 231 providing the pumping voltage Upo and an internal resistance R ia 230.
  • the pumping voltage U P is dropped, and the inner pumping electrode IPE is denoted by the reference numeral 132 in Fig. 1.
  • the outer pumping electrode APE and the inner pumping electrode IPE and the reference electrode RE are connected to a circuit unit 270 via corresponding terminals.
  • the broadband probe is controlled by means of the pump current regulator to its nominal value, the Nernst voltage U n .
  • the pumping current required for this purpose generates a pumping voltage U P which must be within two predefined threshold values, which will be discussed below, so as not to destroy the probe by an excessive pumping voltage.
  • the method according to the invention for protecting the regulated broadband probe against excessively high pumping voltage now starts from the unpowered pumping voltage U P0 and uses this de-energized pumping voltage as a decision variable. Non-energized means that no pumping current flows.
  • One way of measuring the no-current pumping voltage Upo is to switch off the pumping current for a certain time, which can happen, for example, during a pulse-width-modulated (PWM) current signal during a pause in the current.
  • PWM pulse-width-modulated
  • the threshold values are determined and specified empirically; in concrete terms, values are written into a register 270 by the software of the controller 271. Separate threshold values can be set for the two operating ranges "rich” and "lean”. These are also provided with an adjustable hysteresis. In Fig. 3, this is schematically illustrated by the lean region.
  • FIG. 3 shows the lean operating range. Shown are the lean threshold 305 and the adjustable hysteresis 306. This hysteresis 306 causes the lean threshold to vary between the value 305 and a value 307 shown in phantom in FIG. The fat area is not shown.
  • the rich area represents, in principle, the reflection of the lean area on the t-axis in the fourth quadrant shown in FIG. 3, that is, the rich threshold is in the negative pump voltage range, as well as the hysteresis adjustable in the rich range. In other words, if the maximum allowable pumping voltage, ie the
  • Threshold 305 has been exceeded, which can be determined in such a measurement, the pump current regulator is deactivated and it is either the pumping power off or
  • the pumping current is controlled such that the probe is operated within the permitted limits for the currentless pumping voltage U P0 .
  • This is achieved with its own, adjustable characteristic regulator, the blackening protection regulator.
  • Fig. 3 of the reference numeral 340 pump voltage waveform Such a controller can be implemented digitally or analogously. It can also be implemented as a computer program in the control unit.
  • the pumping current regulator which could also be referred to as Nernstwoodsregler.
  • the pumping current controller is configured during its deactivation in such a way that a trouble-free re-entry into the pumping current regulation is possible.
  • the method described above can be implemented very advantageously as a computer program on a computing device, in particular the control unit 271, and run there.
  • the program code may be stored on a machine-readable medium, such as a CD-ROM, a DVD-ROM, a memory stick, an external flash memory, an external drive, or the like, which the controller 270 may read. But it is also possible to realize the controller analog, so as a circuit structure.

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  • 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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un procédé servant à faire fonctionner une sonde lambda à large bande pour la détermination de la concentration en oxygène dans les gaz d'échappement d'un moteur à combustion interne fonctionnant avec un mélange de carburant et d'air. La sonde lambda à large bande comporte une cellule de Nernst et une cellule de pompage, au niveau de laquelle est appliquée une tension de pompage qui est réglée à l'aide d'un régulateur de courant de pompage en fonction d'une tension de Nernst prélevée sur la cellule de Nernst, cette tension correspondant à la concentration d'oxygène dans les gaz d'échappement. Ledit procédé est caractérisé par les étapes suivantes : - la tension de pompage est mesurée avec interruption temporaire du courant de pompage et comparée à une valeur seuil maximale prédéfinie; - lorsque la tension passe au-dessus de la valeur seuil, le régulateur de courant de pompage est désactivé; et - soit le courant de pompage est coupé, - soit le courant de pompage est réglé au moyen d'un régulateur séparé de telle sorte que la tension de pompage se situe à l'intérieur de limites pouvant être prédéfinies.
PCT/EP2012/056189 2011-04-08 2012-04-04 Procédé servant à faire fonctionner une sonde lambda à large bande WO2012136715A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011007068.0 2011-04-08
DE201110007068 DE102011007068A1 (de) 2011-04-08 2011-04-08 Verfahren zum Betreiben einer Breitband-Lambdasonde

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Publication Number Publication Date
WO2012136715A1 true WO2012136715A1 (fr) 2012-10-11

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DE (1) DE102011007068A1 (fr)
WO (1) WO2012136715A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117907406A (zh) * 2024-03-19 2024-04-19 四川智感蔚蓝科技有限公司 一种陶瓷芯片的性能测试方法、装置、介质和终端

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013220756A1 (de) 2013-10-15 2015-04-16 Robert Bosch Gmbh Verfahren zur Bestimmung der Konzentration einer Gaskomponente in einem Gasgemisch
DE102018201479A1 (de) 2018-01-31 2019-08-01 Robert Bosch Gmbh Verfahren zum geschützten Betrieb einer geregelten Breitband-Lambdasonde
DE102019201234A1 (de) * 2019-01-31 2020-08-06 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben einer Breitband-Lambdasonde
DE102019202880A1 (de) 2019-03-04 2020-10-29 Robert Bosch Gmbh Verfahren zum Betreiben einer Lambdasonde
DE102019204219A1 (de) 2019-03-27 2020-10-01 Robert Bosch Gmbh Verfahren zur Diagnose von Abgassensoren
DE102019204827A1 (de) 2019-04-04 2020-10-08 Robert Bosch Gmbh Verfahren zur Diagnose von Abgassensoren
DE102019206023A1 (de) 2019-04-26 2020-10-29 Robert Bosch Gmbh Verfahren zur präzisen Erfassung eines Signals zum Beispiel eines Sensors
EP3875951A1 (fr) 2020-03-06 2021-09-08 Robert Bosch GmbH Évaluation et unité de commande pour un capteur de gaz
DE102020214036A1 (de) 2020-11-09 2022-05-12 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben einer Lambdasonde

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163912A1 (de) * 2001-04-05 2003-02-06 Bosch Gmbh Robert Gassensor, insbesondere Lambda-Sonde
WO2006067054A1 (fr) * 2004-12-21 2006-06-29 Robert Bosch Gmbh Procede et dispositif de regulation d'une sonde de mesure de gaz
DE102007057707A1 (de) 2007-11-30 2009-06-04 Robert Bosch Gmbh Verfahren zum Betreiben eines Gassensors zur Bestimmung der Konzentration von Gaskomponenten im Abgas von Brennkraftmaschinen
WO2009130266A1 (fr) * 2008-04-24 2009-10-29 Continental Automotive Gmbh Circuit de commande pour capteur de gaz électrochimique et procédé de réglage d'un tel capteur de gaz électrochimique
DE102008001697A1 (de) * 2008-05-09 2009-11-12 Robert Bosch Gmbh Auswerte- und Steuereinheit für eine Breitband-Lambdasonde
DE102009029690A1 (de) * 2008-09-24 2010-03-25 Robert Bosch Gmbh Breitband-Sensorelement mit eindeutiger Messkurve
US20100140113A1 (en) * 2008-12-04 2010-06-10 Ngk Spark Plug Co., Ltd. Gas sensor control apparatus and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163912A1 (de) * 2001-04-05 2003-02-06 Bosch Gmbh Robert Gassensor, insbesondere Lambda-Sonde
WO2006067054A1 (fr) * 2004-12-21 2006-06-29 Robert Bosch Gmbh Procede et dispositif de regulation d'une sonde de mesure de gaz
DE102007057707A1 (de) 2007-11-30 2009-06-04 Robert Bosch Gmbh Verfahren zum Betreiben eines Gassensors zur Bestimmung der Konzentration von Gaskomponenten im Abgas von Brennkraftmaschinen
WO2009130266A1 (fr) * 2008-04-24 2009-10-29 Continental Automotive Gmbh Circuit de commande pour capteur de gaz électrochimique et procédé de réglage d'un tel capteur de gaz électrochimique
DE102008001697A1 (de) * 2008-05-09 2009-11-12 Robert Bosch Gmbh Auswerte- und Steuereinheit für eine Breitband-Lambdasonde
DE102009029690A1 (de) * 2008-09-24 2010-03-25 Robert Bosch Gmbh Breitband-Sensorelement mit eindeutiger Messkurve
US20100140113A1 (en) * 2008-12-04 2010-06-10 Ngk Spark Plug Co., Ltd. Gas sensor control apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117907406A (zh) * 2024-03-19 2024-04-19 四川智感蔚蓝科技有限公司 一种陶瓷芯片的性能测试方法、装置、介质和终端
CN117907406B (zh) * 2024-03-19 2024-06-07 四川智感蔚蓝科技有限公司 一种陶瓷芯片的性能测试方法、装置、介质和终端

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