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WO2012034761A1 - Procédé de détermination d'une propriété d'un gaz dans une chambre de gaz de mesure - Google Patents

Procédé de détermination d'une propriété d'un gaz dans une chambre de gaz de mesure Download PDF

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Publication number
WO2012034761A1
WO2012034761A1 PCT/EP2011/062816 EP2011062816W WO2012034761A1 WO 2012034761 A1 WO2012034761 A1 WO 2012034761A1 EP 2011062816 W EP2011062816 W EP 2011062816W WO 2012034761 A1 WO2012034761 A1 WO 2012034761A1
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WIPO (PCT)
Prior art keywords
electrode
pumping
gas
change
current
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.)
Ceased
Application number
PCT/EP2011/062816
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German (de)
English (en)
Inventor
Lothar Diehl
Thomas Seiler
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2012034761A1 publication Critical patent/WO2012034761A1/fr
Anticipated expiration legal-status Critical
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor

Definitions

  • Solid electrolyte materials are yttria-stabilized zirconia (YSZ) and / or scandium-doped zirconia (ScSZ). Examples of devices of the type mentioned are described in Robert Bosch GmbH: Sensors in motor vehicles, edition 2007, pages 154-159.
  • the at least one property of the gas may in particular be a fraction of a gas component of the gas, which can be determined qualitatively and / or quantitatively.
  • a gas component of the gas which can be determined qualitatively and / or quantitatively.
  • Oxygen content can be determined.
  • the share can be in the form of a
  • Percentage and / or in the form of a partial pressure can also be determined, for example physical and / or chemical properties.
  • Jump probes also called broadband lambda probes.
  • broadband lambda probes exist in a single-cell configuration or in multicellular
  • Limit current determines which is established by the cell.
  • the pumping current is at least approximately proportional to the 0 2 - or fat gas content in the exhaust gas.
  • the measurement of the cavity concentration is usually based on the determination of a Nernst voltage between a Nernst electrode in the cavity and an oxygen-purged reference electrode in a reference space. From the prior art, it is generally known to influence the target Nernst voltage, for example to lower permanently or to set a higher Nernst voltage. From DE 10 2005 056 515 A1, a method is also known in which a
  • Gas composition or a gas type of a lambda probe supplied gas is detected by means of a modulated measurement gas change.
  • the sensitivity of the probe for various gases is periodically changed by periodically adjusting the air ratio in the cavity of the lambda probe.
  • a technical challenge of known devices and methods basically consists in the fact that it can lead to a passivation of the inner pumping electrode arranged in the cavity.
  • Such passivations can be caused, for example, by chromium deposition and / or by platinum segregation and / or by other processes which increase the activity and / or the number of
  • a method and a sensor device for detecting at least one property of a gas in a measurement gas space are proposed, which at least largely avoid the disadvantages of known methods and sensor devices.
  • the method and the sensor device can be used, in particular, to qualitatively and / or quantitatively detect a proportion of at least one gas component in the gas, for example a percentage and / or a partial pressure of the gas component, which in particular can be oxygen.
  • at least one sensor element is used, wherein the sensor element comprises at least one pump cell with at least one first electrode, at least one second electrode and at least one solid electrolyte connecting the first electrode and the second electrode.
  • the first electrode and / or the second electrode may, for example, be designed as cermet electrodes, for example as platinum cermet electrodes.
  • the solid electrolyte can basically be any body with ion-conducting
  • this may be a solid.
  • the solid electrolyte may be a ceramic solid electrolyte or may comprise a ceramic solid electrolyte.
  • the solid electrolyte may also comprise one or more other materials having ion-conducting properties, for example one or more polymers.
  • the solid electrolyte can be a ceramic solid electrolyte or may comprise a ceramic solid electrolyte.
  • the solid electrolyte may also comprise one or more other materials having ion-conducting properties, for example one or more polymers.
  • the solid electrolyte can be a ceramic solid electrolyte or may comprise a ceramic solid electrolyte.
  • the solid electrolyte may also comprise one or more other materials having ion-conducting properties, for example one or more polymers.
  • the solid electrolyte can be a ceramic solid electrolyte or may comprise a ceramic solid electrolyte.
  • the solid electrolyte may also comprise one or more other materials having ion-conducting properties, for example one or more polymers.
  • a zirconia-based solid electrolyte for example, YSZ and / or ScSZ.
  • the method is performed such that the property is deduced from a pumping current through the pumping cell, for example, the oxygen content in the
  • the measuring gas chamber may in particular be an exhaust gas tract of an internal combustion engine, and the gas may be an exhaust gas of the
  • the pumping cell is operated or controlled using at least one reference variable.
  • the second electrode may be arranged in an electrode cavity.
  • a Nernst voltage between a measuring electrode which is likewise arranged in the electrode cavity and which may be configured as identical with the second electrode or which may be designed as a separate measuring electrode, and a reference electrode arranged in a reference gas space, for example a reference gas channel, and Actual value can be used.
  • This actual value of the Nernst voltage can with a
  • predetermined setpoint of a Nernst voltage are compared as a reference variable, and the pumping current through the pumping cell can be adjusted such that a
  • Control difference between the actual value and the reference variable disappears.
  • Robert Bosch GmbH Sensors in
  • Pump cell however, also controlled using other control variables, control variables or reference variables and / or controlled operated.
  • a pumping current can be regulated by the pumping cell to a predetermined value.
  • the method furthermore comprises at least one control step, which can likewise be carried out simply, repeatedly or even over a relatively long period of time.
  • At least one control step can be followed by at least one measuring step, after which a second measuring step can again follow.
  • measuring step and control step can be carried out alternately.
  • other embodiments are possible in principle.
  • the reference variable is changed.
  • This change can take place, for example, by a predetermined amount, for example by changing a setpoint Nernst voltage U NS O II by, for example, a predetermined amount, in particular increasing it.
  • a desired pumping voltage Up.soii and / or a desired pumping current I P , S oii can also be changed.
  • the change in the reference variable can be done once or several times.
  • the change can also be repeated, with the same change or an adapted change.
  • Reference variable also oscillating done, for example periodically oscillating.
  • the adaptation can then take place, for example, such that the mean value of the oscillation of the reference variable is set in such a way, for example by a
  • Control device that the resulting change in the pumping current, for example, the resulting pumping current amplitude or amplitude of the change in the pumping current, a predetermined threshold, for example, 20 ⁇ , does not exceed. Furthermore, in the control step, a change in the pumping current I p is detected by the pumping cell. In other words, the change in pumping current in
  • Reaction to the change in the reference variable can be detected.
  • This change can be detected as an absolute change or in the form of a temporal evolution of the pumping current. Also other ways of quantifying the
  • Change is possible, such as detecting a change over a period of time.
  • the method can be carried out in such a way that the reference variable in the measuring step is adapted, in particular increased, if the change in the pumping current in the control step no longer satisfies at least one threshold condition. For example, it can be queried in this control step, whether the pumping current reaches at least a predetermined threshold, exceeds or falls below. For example, it is possible to query whether the pumping current or a characteristic variable derived therefrom or the change in the pumping current or the magnitude thereof are smaller than a predefined threshold value, smaller than or equal to a predefined threshold value
  • Threshold or similar threshold conditions can be set.
  • the threshold condition can be adapted in particular such that a in the
  • the method can be carried out in such a way that an on-board
  • Control step which is also referred to as a test phase, by a defined amount, for example by 20 to 400 mV, in particular by 100 to 300 mV and particularly preferably by 200 mV, briefly increased, for example by a period of 0.5 to 10 s, in particular a period of 0.8 to 2 s and more preferably for a period of 1 s. If, in this case, the pump current I P increases by at least one threshold value or by more than one threshold value, a new regulation setpoint value of the
  • Nernst voltage U NS O II are stored in a control electronics.
  • the threshold may be 50 ⁇ to 400 ⁇ , in particular 100 ⁇ to 300 ⁇ and more preferably 200 ⁇ .
  • the control setpoint of the Nernst voltage can be raised, for example, by 20 mV to 400 mV, in particular by 100 mV to 300 mV and particularly preferably by 200 mV.
  • the adjustment of the reference variable can be simple or iterative. If an iterative adaptation, for example, the reference variable can be increased or decreased so many times by one or more predetermined amounts, which can be adapted to the number of steps and / or, for example, increasingly smaller, until the change in the pumping current in the Control step that meets at least one threshold condition.
  • one or more further measures can be taken, alternatively or in addition to a change in the reference variable or an adjustment of the reference variable.
  • a regeneration step can be initiated.
  • Regeneration steps may include various measures involving the
  • a regeneration step may include a pump flow reversal by the pump cell. Such pumping current reversal can be initiated for example for a certain period of time. Alternatively or additionally, for example, temperature increases or other measures for the regeneration of one or more of the electrodes come into consideration, for example, by the sensor element is temporarily exposed to a rich exhaust gas.
  • the method can be carried out in particular such that the first electrode and / or the second electrode are acted upon with gas from the measurement gas space or can be acted upon.
  • the sensor element may be configured such that the first electrode and / or the second electrode are in communication with the measurement gas space directly or via a gas-permeable protective layer.
  • the first electrode and / or the second electrode may also be connected to the measuring gas space by at least one diffusion barrier.
  • the first electrode and / or the second electrode may be disposed on a surface of the
  • Sensor element may be arranged or in an electrode cavity in the interior of the Sensor element, which via the at least one diffusion barrier with the
  • the at least one diffusion barrier can, for example, protect the first electrode and / or the second electrode from contamination and / or set a limiting current of the pump cell.
  • one or more of the electrodes may be in communication with a reference gas space.
  • the second electrode may be an electrode in communication with a reference gas space, while, for example, the first electrode may be supplied with gas from the measurement gas space.
  • the second electrode can for example be arranged directly in the reference gas space or communicate with this reference gas space in another way.
  • the reference gas space is a gas space in which a defined gas atmosphere can be established. For example, this can be a closed cavity, which can be acted upon by a pumping process with a defined atmosphere.
  • the reference gas space may also comprise at least one reference gas channel, for example an air reference channel, which may be connected to an environment of the sensor element, for example, which may be formed separately from the sample gas space.
  • a reference gas channel for example an air reference channel
  • the sensor element for example, which may be formed separately from the sample gas space.
  • Embodiment in which the second electrode is in communication with at least one reference gas space can be used in particular in a single-cell sensor structure.
  • other sensor structures are basically possible.
  • the second electrode or at least one of the second electrodes can also be arranged in an electrode cavity. This electrode cavity can be formed, for example, separated from the sample gas space by the solid electrolyte.
  • the electrode cavity may be configured as a cavity in which a defined by the above-described control or regulating method
  • Gas atmosphere or gas composition to be set for example, a defined lambda value.
  • a defined lambda value for this purpose, in the electrode cavity
  • At least one measuring electrode may furthermore be arranged, for example at least one Nernst electrode.
  • This at least one measuring electrode may be wholly or partially component identical to the second electrode or electrically to the second Electrode be connected, which is particularly preferred in the context of the present invention and as described for example in Robert Bosch GmbH: sensors in
  • Nernstelektrode be used for a Nernstschreibshunt, makes the inventive prevention or the inventive compensation of
  • Electrode polarization particularly advantageous noticeable may also be formed separately from the second electrode.
  • Other embodiments are possible.
  • the pumping cell can be operated in the measuring step, in particular in a limiting current operation.
  • a limiting current is to be understood as meaning the saturation current for a specific composition of the gas which sets in the pump current-voltage characteristic.
  • the pumping voltage can in particular be selected such that the pumping current is in the saturation region, as is common in many broadband probes.
  • the command variable can, as described above, be configured in various ways.
  • the reference variable can be at least one nominal value of a
  • a desired Nernst voltage can be specified as a reference variable, which is measured, for example, between the second electrode and a reference electrode, which can be arranged, for example, in a reference gas space in the manner described above.
  • the first electrode can in particular be charged with gas from the measuring gas space, as stated above.
  • the sensor element may further comprise at least one reference electrode in at least one reference gas space, wherein a
  • Nernst voltage U N between the second electrode and the reference electrode can be detected.
  • the measuring step as stated above, in particular the
  • a nominal Nernst voltage U N.Soll 3lS reference variable In the control step can, as stated above, in particular the desired Nernst voltage U NS O II be changed by a value ⁇ UN.S O II, in particular be increased, the change ⁇ ⁇ of the pump current is detected and compared with at least one threshold.
  • the nominal Nernststpan Vietnamese can for example be changed, in particular be increased if the change ⁇ ⁇ reaches or exceeds the threshold.
  • the desired Nernst voltage U NS O II can be changed by one or more predetermined amounts, wherein the amounts can be fixed or can for example be adapted to the iteration of the method, for example, iteratively smaller can be selected when the change ⁇ ⁇ of the pump current approaches the threshold.
  • the reference variable may also include a pump voltage U P , for example a desired pump voltage.
  • this pumping voltage can be changed by a value ⁇ ⁇ , wherein the change ⁇ ⁇ of the pumping current can be detected in response to this change in the pumping voltage and can be compared with at least one threshold.
  • the pump voltage can then be changed, in particular increased, if the change ⁇ ⁇ at least reaches or exceeds the threshold value. In this way, for example, unicellular sensor elements can be operated with the proposed method.
  • the reference variable may also include a pumping current I p .
  • the pumping current can be changed by a value ⁇ ⁇ .
  • a change AU P of a pump voltage and / or a change AU N of a Nernst voltage can be detected and compared with at least one threshold value.
  • the pumping current can be changed, in particular increased, if the changes AU P or AU N exceed or do not fall below the threshold value.
  • a sensor device for detecting at least one property of a gas in a sample gas space
  • Sensor device may include corresponding devices to perform one, several or all of the substeps of the method described above.
  • Sensor device comprises at least one sensor element, in particular at least one ceramic sensor element.
  • the sensor element comprises at least one pump cell at least one first electrode, at least one second electrode and at least one connecting the first electrode and the second electrode
  • the sensor device further comprises at least one controller connected to the sensor element or at least connectable.
  • the controller can be set up centrally or else decentrally and can include, for example, one or more data processing devices.
  • the control can also be completely or partially integrated in a central motor control or also be integrated in whole or in part in the sensor element and / or a plug.
  • the controller is arranged to close the property from pumping current through the pumping cell.
  • the controller may for this purpose comprise at least one application device, for example at least one voltage source and / or current source, with at least one pump cell
  • the controller may, for example, further comprise at least one measuring device, for example at least one current measuring device and / or one
  • Voltage measuring device for example, to measure the pumping current through the pumping cell.
  • the controller is furthermore set up to operate or control the pumping cell in at least one measuring step using at least one reference variable.
  • the controller may, for example, at least one
  • Voltage control and / or at least one current control and / or at least one voltage control and / or at least one current control include, which may be connected, for example, with the pumping cell.
  • the controller is further configured to change in at least one control step, the reference variable and to detect a change in the pumping current.
  • the controller can be set up in terms of programming in order to carry out the checking step and to carry out the corresponding changes or measurements.
  • the controller can, for example, comprise at least one measuring device, as stated above.
  • the proposed method and the proposed sensor device have numerous advantages over known methods and devices. Thus, these can be used in particular for reliable on-board compensation of a change in one or more of the electrodes of the sensor element. In this way it is possible to reliably prevent or at least reduce a change in the measured value and / or a signal distortion which can occur as a result of aging.
  • Figure 1 shows an embodiment of a sensor device according to the invention
  • FIG. 2 shows pump current-pump voltage characteristic curves and Nernst voltage
  • FIG. 1 shows by way of example an embodiment of an inventive device
  • Sensor device 1 10 for detecting at least one property of a gas in a measuring gas chamber 1 12 shown.
  • the sensor device 110 includes a
  • Sensor element 114 and a controller 118 connected to the sensor element 114 via an interface and / or another connection 116.
  • the sensor element 1 14 comprises in the illustrated embodiment, a first electrode 120, which is also referred to below as APE (outer
  • the first electrode 120 may, for example, by a gas-permeable Protective layer 122 to be separated from the sample gas space 112.
  • the sensor element 1 14 comprises a second electrode 124, which in the illustrated
  • Embodiment is disposed in an electrode cavity 126 and which accordingly can also be referred to as inner pumping electrode (IPE).
  • the electrode cavity 126 is connected via a gas inlet hole 128 and a diffusion barrier 130, which limits subsequent diffusion of oxygen and / or gas, with the
  • the second electrode 124 is connected to the first electrode 120 via a solid electrolyte 123.
  • the first electrode 120, the solid electrolyte 123 and the second electrode 124 together form a pumping cell 125.
  • the sensor element 1 14 in the illustrated embodiment comprises a third electrode 132, which is also referred to as a reference electrode (RE) and which in a
  • Reference gas space 134 is arranged.
  • the reference gas space 134 which may be designed to be open or which may also be completely or partially filled with a gas-permeable, porous material 136 as shown in FIG. 1, may be configured, for example, as a reference gas channel 138, for example as an air reference channel.
  • the second electrode 124, the solid electrolyte 123 and the third electrode 132 together form a Nernst cell 139.
  • the interface 116 preferably comprises electrode leads 140, 142 and 144 to the first electrode 120, the second electrode 124 and the third electrode 132 In the illustrated embodiment, a control device 146.
  • a Nernst voltage between the IPE 124 and the RE 132 can be set or adjusted to a nominal Nernstschreib UN, S O II 3ls reference variable 148.
  • the controller 1 18 for this purpose include an adjustable voltage source 150 for setting the target Nernstschreib.
  • one end of the voltage source 150 and the electrode lead 142 of the second electrode 124 may be connected to electrical ground 152 such that the one provided via the electrode lead 144 of the third electrode 132
  • Nernst voltage U N (actual value) and the target Nernst voltage U N, soii (setpoint) in a comparison device 154 (for example, a comparator) can be compared with each other to a control difference from a control variable and / or manipulated variable 156 in the form of a pumping voltage U P and or to generate a pumping current I P , which in turn is applied to the APE 120 to adjust an atmosphere corresponding to the reference variable 148 in the electrode cavity 126.
  • the specification of the reference variable 148 for example, by a
  • Data processing device 158 take place in the controller 118, which, for example, affects the adjustable voltage source 150 and / or may include all or part thereof.
  • the controller 1 18 may include one or more measuring devices 160, which may detect, for example, the pumping current I P and / or the pumping voltage U P. The measured values of this measuring device 160 can be provided to the data processing device 158, for example. Alternatively or additionally, the measuring device 160 may also be wholly or partially inserted in the
  • Data processing device 158 be integrated.
  • the data processing device 158 may, for example, be set up in terms of programming in order to carry out a method in accordance with one or more of the method variants described above.
  • Data processing device 158 may include, for example, a microcontroller. Alternatively or additionally, the controller 118 may also be configured in whole or in part as an application-specific integrated circuit (ASIC). Various other configurations are possible.
  • ASIC application-specific integrated circuit
  • Adjust or regulate electrode cavity 126 In typical
  • control setpoint over the entire life of the sensor device 1 10 is typically 450 mV.
  • the pumping voltage U P is applied to the pumping cell 125 on the horizontal axis.
  • the curve 162 which is assigned to this left vertical axis, denotes a pumping current pumping voltage characteristic of an intact sensor element 14, at which no electrode polarization has yet occurred at the second electrode 124.
  • the dashed curve 164 denotes a pumping current of a polarizing sensor element 114, that is, a sensor element 114, in which at the second electrode 124, the polarization effects described above have occurred. It can be seen that this curve is much flatter and later the
  • the Nernst voltages U N are plotted on the right vertical axis as a function of the pumping voltage U P.
  • the solid line 166 indicates a Nernst voltage of an intact sensor element 114
  • the dashed line 168 indicates a Nernst voltage of a polarizing one
  • Sensor element 1 14 denotes, that is, a sensor element 114, wherein the second electrode 124 has the above-described polarization effects. Starting from these curves 166, 168, the effect outlined above can be described.
  • the Nernst voltage is set to a value U N, soii of 450 mV, which corresponds to the pump voltage U P, i for an intact sensor element 14.
  • the pump current characteristic 162 of such an intact sensor element 1 14 is already in the saturation region at this pump voltage U P, i and has at least approximately the value l s .
  • Electrode lead 144 in Figure 1 already at smaller pump currents l P the value U N, soii of 450 mV. This is illustrated in FIG. 2 in that the Nernst voltage curve 168 of the polarizing sensor element 114 rises considerably earlier than the one
  • the pump cell 125 in at least one measuring step, is controlled or controlled using the reference variable U NS O II and closed from the pumping current on the property of the gas in the sample gas space 1 12, for example, the oxygen partial pressure.
  • the reference variable U NS O II is changed, for example, by a predetermined amount ⁇ N, S O II- The change in the pump current ⁇ ⁇ is detected. In curve 170 in Figure 3, this change is nearly 0 or very small.
  • ⁇ ⁇ divided by ⁇ NS O II is greater than 0.
  • This ⁇ ⁇ (or, which is equivalent to ⁇ ⁇ divided by ⁇ NS O II or, which is also equivalent to l ' P ) may be of at least one threshold be compared. If this at least one threshold is at least reached or exceeded, then it can be concluded that the sensor element 1 14 is no longer intact. In this case, for example, a warning can be issued or the reference variable U NS O II can be adjusted.
  • the reference variable I NS O II can be increased, for example by a predetermined amount. Thereafter, a further control step can be run through and, if appropriate, the setpoint Nernst voltage can be further increased, as long as the above-described threshold condition is still not met and the change ⁇ ⁇ is still too large. In this way it can be achieved that U N is increased in Figure 2 such that U P, 2 so far to the right shifts in Figure 2, that the pumping current l P * approaches the saturation pump current l s .
  • the method can for example be carried out in such a way that in solid
  • Time intervals for example, every 5 hours and / or preferably at a lean exhaust gas condition, preferably - but not necessary - in overrun, the change of the pump current l P detected with an increase of U NS O II and then optionally the target Nernst voltage U NS O II is increased. Then another test cycle, ie a further control step, can be run through and, if appropriate, the setpoint Nernst voltage U N , soii can be further increased. Optionally, further control steps may follow.
  • the change ⁇ ⁇ in a U N.soii increase and subsequent decrease is measured to provide redundancy of the data.
  • Oscillation can be regulated by a control device to a minimum value such that a resulting pump current amplitude does not exceed a certain threshold value, for example 20 ⁇ .
  • the method described above can also be applied to a single-cell lambda probe, for example to a sensor element 1 14, which has only the pumping cell 125.
  • the target Nernst voltage UN , S O II can be replaced by a desired pumping voltage U P, S 0 II. Since the curve 164 in FIG. 2 reaches the saturation l s much later than the intact curve 162, it is likewise possible by means of a
  • Threshold method can be detected in the control step, when the pump cell 125 is no longer running in the limiting current operation.
  • the desired pumping voltage U P, S0 II can be increased, which in turn can also take place in one or more steps, optionally also iteratively and / or oscillatingly.
  • a temperature of the pumping cell 125 can be set to a value of 500 to 800 ° C, in particular to a value of 600 to 700 ° C. Due to this lowered temperature of the sensor element 1 14 and in particular the pumping cell 125, a heating power requirement can be significantly reduced.
  • the amount of catalytically active noble metal in one or more of the electrodes 120, 124 and 132, in particular in the IPE 124, can be significantly reduced with the proposed method and the resulting robustness with respect to electrode polarization.
  • the detection of an electrode polarization in the at least one control step for example by varying the reference variable and in particular the desired Nernst voltage, also in one or more of the above
  • Method as a trigger for a regeneration process for example by means of a temporary pumping current reversal and / or a temporary or permanent
  • Temperature increase and / or a temporary application of grease gas can be used. Such measures generally have a regenerating effect.
  • the change in the reference variable can be carried out in any method according to the invention both in the positive and in the negative direction. So were above in the
  • the proposed method and the proposed sensor device 1 10 are also suitable for other applications.
  • the proposed method can in principle also be applied, for example, to NOx sensors, so that the sensor device 110 can be used, for example, for detecting a proportion of NOx in the measurement gas space 112.
  • Such sensor elements are basically also known from the prior art.

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Abstract

L'invention concerne un procédé de détermination d'au moins une propriété d'un gaz dans une chambre de gaz de mesure (112), notamment pour la détection d'au moins un composant gazeux dans le gaz. Au moins un élément de détection (114) est utilisé, l'élément de détection (114) comprenant au moins une cellule à pompage (125) ayant au moins une première électrode (120), au moins une seconde électrode (124), et au moins un électrolyte solide (123) reliant la première électrode (120) et la seconde électrode (124). Une information relative à la propriété résulte d'un flux de pompage à travers la cellule à pompage (125). Dans au moins une étape de mesure du procédé, la cellule à pompage (125) est mise à fonctionner de manière réglée ou commandée, par utilisation d'au moins une grandeur de référence(148). Dans au moins une étape de contrôle du procédé, la grandeur de référence (148) est modifiée, et une variation du flux de pompage est détectée.
PCT/EP2011/062816 2010-09-15 2011-07-26 Procédé de détermination d'une propriété d'un gaz dans une chambre de gaz de mesure Ceased WO2012034761A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010040821A DE102010040821A1 (de) 2010-09-15 2010-09-15 Verfahren zur Bestimmung einer Eigenschaften eines Gases in einem Messgasraum
DE102010040821.2 2010-09-15

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WO2012034761A1 true WO2012034761A1 (fr) 2012-03-22

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DE102013212288A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Verfahren zum Betrieb eines Sensorelements und Sensorvorrichtung
DE102021212820A1 (de) 2021-11-15 2022-12-01 Vitesco Technologies GmbH Verfahren zum Betreiben eines Abgassensors für eine Brennkraftmaschine und Abgassensor

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WO2001023729A2 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Procede pour controler la fonction une sonde de gaz et/ou de la regenerer
WO2003027462A2 (fr) * 2001-09-26 2003-04-03 Robert Bosch Gmbh Sonde lambda large bande presentant un comportement ameliore au demarrage
DE102005056515A1 (de) 2005-11-28 2007-05-31 Robert Bosch Gmbh Verfahren zur Erkennung der Diffusionsgaszusammensetzung in einer Breitband-Lambdasonde
DE102007035318A1 (de) * 2007-07-27 2009-01-29 Robert Bosch Gmbh Verfahren und Schaltungsanordnung zum Betreiben einer Breitbandlambdasonde
DE102008043124A1 (de) * 2008-10-23 2010-04-29 Robert Bosch Gmbh Verfahren zur Diagnose einer in einem Abgaskanal eines Verbrennungsmotors angeordneten Lambdasonde und Vorrichtung zur Durchführung des Verfahrens

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WO2001023729A2 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Procede pour controler la fonction une sonde de gaz et/ou de la regenerer
WO2003027462A2 (fr) * 2001-09-26 2003-04-03 Robert Bosch Gmbh Sonde lambda large bande presentant un comportement ameliore au demarrage
DE102005056515A1 (de) 2005-11-28 2007-05-31 Robert Bosch Gmbh Verfahren zur Erkennung der Diffusionsgaszusammensetzung in einer Breitband-Lambdasonde
DE102007035318A1 (de) * 2007-07-27 2009-01-29 Robert Bosch Gmbh Verfahren und Schaltungsanordnung zum Betreiben einer Breitbandlambdasonde
DE102008043124A1 (de) * 2008-10-23 2010-04-29 Robert Bosch Gmbh Verfahren zur Diagnose einer in einem Abgaskanal eines Verbrennungsmotors angeordneten Lambdasonde und Vorrichtung zur Durchführung des Verfahrens

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