CN101893597B - Method for conditioning sensor element - Google Patents
Method for conditioning sensor element Download PDFInfo
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- CN101893597B CN101893597B CN201010181676.7A CN201010181676A CN101893597B CN 101893597 B CN101893597 B CN 101893597B CN 201010181676 A CN201010181676 A CN 201010181676A CN 101893597 B CN101893597 B CN 101893597B
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- 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
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
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- 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
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- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- 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
Abstract
The present invention relates to a method for conditioning a sensor element. The sensor element (116) is used for detecting at least one gas property in a measuring chamber, particularly for recording portion of gas component, and involves at least a measuring cell (118) with at least a first electrode (120), where the first electrode (120) may be loaded by the gas in the measuring chamber, the measuring cell (118) is also provided with at least a second electrode (124) and at least a solid electrolyte (127) for connecting the first electrode (120) and the second electrode (124). Before the sensor element (116) is used, at least a conditioning process is subjected to the measuring cell (118) for an increase in conditioning temperature.
Description
Technical field
The present invention come from for survey measurement gas chamber gas at least one characteristic known sensor element and for the manufacture of the known manufacturing methods of this sensor element.These sensor elements for example can be provided for surveying a kind of physical characteristics and/or the chemical characteristic of the gas in measurement gas chamber.A constituent that focuses on especially surveying the gas in measurement gas chamber of the invention the following describes, especially surveys the component of a gas componant of the gas in measurement gas chamber, for example the dividing potential drop of a gas componant and/or concentration.Described gas componant can be especially oxygen.
Background technology
Sensor element especially can be for surveying the air coefficient λ of engine exhaust gas.This sensor element is also often called as lambda seeker.For example at the 154th of automobile sensor one book of 2007 editions of Robert Bosch GmbH company, having described in to 159 also can be by means of the lambda seeker of manufacturing according to method of the present invention in scope of the present invention.This sensor element can be especially so-called 2 lambda seekers.The method especially can for the manufacture of with regulate processing cost sensor element favourable and that simply, do not contain integrated heating element, for example so-called lambda seeker not heating.This lambda seeker for example can be used as low-cost detector and uses in two-wheel vehicle applications, for example as sensor element, conduct, be fixed on a sensor element in housing, it is in the back also referred to as assembly or as complete detector, and it is in the back also referred to as sensor.
Especially the lambda seeker not heating demonstrates long t actuation time to application in many cases after installing
2.Time t
2described after the operation of dense gas is transformed into diluted gas operation when detector voltage is reduced to 300mV from 600mV, lambda seeker is the needed time on burner testing table.In addition, when sensor element is repeatedly installed in testing table and while measuring subsequently, this actuation time t
2can not reproduce in many cases or be difficult to and reproduce.Therefore produce and there is t actuation time shortening than conventional sensors element
2sensor element and make t actuation time
2stable is desired.
Summary of the invention
Correspondingly proposed a kind ofly for regulating the method for the sensor element of processing the above-mentioned type, the method has been avoided at least to a great extent known manufacture and has been regulated the shortcoming of disposal route or with this known method, manufacture and regulate the defect of sensor element, assembly and the sensor of processing.The sensor of the method for regulating at least one sensor element of processing or the assembly that contains this sensor element or containing this sensor element.As mentioned above, assembly represents that at least one is fixed on the sensor element at least one housing in the case, sensor represent one that can put into operation, comprised described assembly and if desired other building block as the member of for example plug connector.Now in scope of the present invention, regulate to process to refer to such a process, in this process, sensor element is ready to for use in certain application target.The object that this adjusting is processed especially can be in order to realize constant and repeatably to measure and prepare sensor element, for example, to eliminate the impurity being caused by certain manufacturing step, and these impurity may affect measured value.Therefore, regulate to process and can comprise one during manufacturing sensor element or the process (operation) of enforcement after manufacturing.Correspondingly, can be ready-made to part, but there is at least in part the sensor of ability to work, for example do not have chlamydate sensor element, to the sensor element in housings (assembly) or to complete ready-made sensor, implement to regulate and process.Regulating processing can be a part for manufacture method thus.Correspondingly can propose a kind of manufacture method, this manufacture method comprises adjusting disposal route described below.But also can be by step or under complete ready-made sensor situation, for example on independent testing table and/or on final place to use, for example, in automobile, implement individually this adjusting disposal route.
Sensor element is for surveying at least one characteristic of the gas of measurement gas chamber.For example can be correspondingly referring to above-mentioned known sensor element.This sensor element can be especially a kind of sensor element not heating, that is a kind of sensor element that there is no integrated heating element.As mentioned above, this sensor element especially can be in two-wheel vehicle applications.This sensor element can be especially a kind of single battery type sensor element, i.e. such sensor element, and it has, and just what a measures battery, and for example transition battery or one are with the battery operated measurement battery of transition.But the sensor element of other version is also possible in principle, wherein for example can be referring to explanation above.This sensor element can be especially a kind of two point form lambda seeker.Many cell type transducers element and/or in principle also can be according to advised method manufacture according to the sensor element of other different measuring principle work.
In the method for suggestion, provide at least one to measure battery.The manufacture of measuring battery itself can be the ingredient of the method, but also can in the method for separating, implement, and it is the ingredient of advised method that measurement battery is only provided thus.As mentioned above, this adjusting disposal route also can be to only partly ready-made sensor enforcement.But the degree that sensor element is ready should be able to the measurement battery that provides described, and this measurement battery should possess service ability at least in part.
Measure battery and have at least one first electrode and at least one second electrode, wherein the first electrode can be used the gas-loaded in measurement gas chamber.This loading for example can directly or indirectly be carried out, for example can be by making the first electrode directly bear the gas of measurement gas chamber and/or bear the gas of measurement gas chamber through the protective seam that can see through gas of porous.But, alternatively or additionally, also can consider, by one or more admission passages, the first electrode is applied to the gas in measurement gas chamber, gas can for example flow and/or diffusion or mobile in the opposite direction and/or diffusion to the first electrode by this admission passage.The second electrode for example can with a reference gas chamber UNICOM.The parts of this reference gas chamber for example can be identical wholly or in part with measurement gas chamber, but also can completely or partially separate with measurement gas chamber.Particularly preferably be, the second electrode and at least one reference gas chamber UNICOM, Yu Yige reference channel UNICOM especially, this reference gas chamber and measurement gas chamber are separate construction.Can be for example a benchmark air duct in the case, the engine room UNICOM of this benchmark air duct and internal combustion engine and for example, separating with the exhaust pipe that will measure therein fuel gas mixture composition (air coefficient).This external pelivimetry battery has the solid electrolyte that at least one connects the first electrode and the second electrode.
Solid electrolyte is a kind of ceramic solid electrolyte preferably, to be construed as be a kind of such material to solid electrolyte herein, its at least at the temperature improving, (for example, higher than 600 ℃, be preferably at least at the temperature of 800 ℃) have to the ion of one or more types for example oxonium ion carry out the ability of ionic conduction.Now for example can use known solid electrolyte material, zirconium dioxide (YSZ) as stable in for example ytterbium.But alternatively and additionally, also can use other solid electrolyte material, for example the stable zirconium dioxide of scandium or the solid electrolyte material of other type.
Sensor element can also comprise that other arrives this also NM parts except measuring battery.As mentioned above, sensor element for example can also comprise other battery and correspondingly be configured to monocell device or many batteries device except measuring battery.Measure battery preferably battery operated as this spy of energy, that is battery operated as transition, but also can be used as in principle pump battery, use.As this energy, this is special when battery operated, sensor element has corresponding control and/or analysis circuit, but the latter also can be on whole or in part, be the ingredient of the device that separates of outside and a sensor element.Correspondingly, general situation can be referring to prior art.In addition sensor element can be arranged in probe body.Measure battery and for example can be embodied as a kind of layer of structure, preferably ceramic layer structure.This layer of structure example as can with protection tube for example the protection tube of metal surround, it can make gas from measurement gas chamber preferably with sealing by this sealing, for example, from the exhaust pipe of internal combustion engine, be penetrated into this layer of structure.Layer structure example, as can be so realized, makes the first electrode and the second electrode mutually up and down or be arranged side by side.Particularly preferably be, the first electrode is configured in layer structure as external electrode, and the second electrode is as being positioned at inner electrode.In addition,, as also will described in detail below, sensor element can have one or more seal elements, for example one or more diaphragm seals and/or packaging part.Also can be referring to above-mentioned prior art to this, for example, referring to automobile sensor one book the 156th of 2007 editions of Robert Bosch GmbH and 157 pages.The sensor element of showing there substantially also can and/or regulate according to method manufacture of the present invention and process.
The present invention's suggestion made to measure battery and stands at least one adjusting processing procedure before sensor element is come into operation.In regulating processing procedure, make to measure the adjusting treatment temperature that battery bears a kind of raising.In regulating processing procedure, selectively to measuring battery, additionally apply a kind of adjusting processing electric current.
The temperature now improving refers to the temperature higher than room temperature in principle, preferably higher than 200 ℃, is especially greater than the temperature of 300 ℃.Regulate treatment temperature especially be at least 800 ℃, be preferably at least 900 ℃ be particularly preferably at least 1000 ℃.In regulating processing procedure, preferably can use an outside well heater, that is one not the well heater of the ingredient of sensor element itself.Especially can use one or more in following well heater: electric heater, especially wound form electric heater, for example, surround the electric heater of the some parts of sensor element and/or sensor element wholly or in part; The sensor stand that can heat, receives the heatable gap of one or more sensor elements in particular for peace; Flame, especially gas flame; Heated gas.
In this external adjusting processing procedure, can make at least one seal element vitrifacation of sensor element, for example the seal element of a sheet and/or a packaging part.Now especially can relate to one or more in following seal element: the seal element that comprises at least one glass ingredient and/or the element of being made by glass ingredient, especially boron nitride seal element; The talcum element that contains at least one glass ingredient.This situation is so a kind of example, and the adjusting disposal route advised can be a part of the manufacture method of sensor element.The step that applies in this case the adjusting treatment temperature of raising was implemented as a part for the manufacture process of sensor element by the while, because vitrifacation is processed, was a part for this manufacture process.
Regulate processing procedure especially can in a kind of gas atmosphere of restriction, implement, a kind of at least with regard to one or more compositions its composition be known gas atmosphere.As can be, in dense gas atmosphere, implemented to regulate processing procedure preferably in the volume of air/gas mixture of having burnt, and/or in a kind of gas atmosphere of conversion.The gas atmosphere of this restriction can be especially the gas composition that a kind of air coefficient is known, for example, be air and/or especially dense gas.Alternatively or additionally, regulate processing procedure also can in a kind of gas atmosphere of alternately conversion, implement, for example, carry out therein implementing the gas atmosphere of the conversion from rare air coefficient to dense air coefficient at least one times or reverse conversion.Also can carry out a series of repeatedly air conversion.As also will described in detail below, regulate processing procedure especially can comprise step by step a plurality of, wherein at least one, use a kind of the first gas atmosphere in step by step, a kind of dense gas atmosphere for example, and second use another kind of gas atmosphere in step by step at least one, a diluted gas atmosphere for example, vice versa.
Regulate processing procedure especially can on a burner testing table, implement.Now burner testing table is generally a kind of like this device, in this device, make a part at least one sensor or sensor, for example at least one measures battery, comprise the assembly that at least one is measured the sensor element of battery or comprises at least one sensor element, bear the heat being produced by burner and/or air-flow that produced by burner or impact.Alternatively or additionally also can apply a kind of gas atmosphere of restriction.
Except applying the adjusting treatment temperature of raising measuring battery as mentioned above, in regulating processing procedure, also can additionally with regulating, process current load to described measurement battery.Even measure battery when sensor element normally moves as can this spy battery operated, the current load of processing electric current also can be implemented to regulate in no current ground and only for measuring the electromotive force between at least two electrodes during regulating processing procedure.Especially can regulate processing procedure at least one step by step in, for example regulating one first of processing procedure to select in this wise to regulate in step by step and process electric current, make the second electrode on the higher electromotive force of ratio first electrode, now oxygen due to pumping process preferably from the first electrode for example external electrode flow to the second electrode for example in electrode.As mentioned above, regulate processing procedure also can comprise step by step a plurality of, wherein measure battery at least two step by step in the different adjusting processing current load of direction of current.For example regulate processing electric current can be 0.5mA at least in the size of amount, is preferably at least 1mA, is particularly preferably between 1mA and 30mA.Particularly preferably be, at one first, to measuring battery, with the adjusting between 1mA and 30mA, process current load and to measuring battery, with reverse adjusting, process current load at one second in step by step in step by step, be preferably used in 0 μ A and-adjusting processing current load between 30mA.
Regulate processing procedure, each that especially regulates processing procedure step by step, can preferably have at least one second, is preferably between 5 seconds and 90 seconds, is particularly preferably the duration of at least 30 seconds.
The method especially can be bundled in a test sequence.In the case, preferably directly before or after each test procedure of described test sequence and/or between carry out or implement described at least one adjusting processing procedure.
By means of the method for advising in one or more above-mentioned forms of implementation, can shorten significantly and operating stably time t
2.By adopting individually or in combination described measure to eliminate or reducing at least to a great extent especially one of them electrode of staying on sensor element or the dense gas componant on two electrodes.In addition, can evaporate reliably or at least reduce on the electrode surface of one of them electrode or two electrodes and/or interior poison control centre, for example compound of silicon, boron, chromium or the compound of other transition metal.
At least one first electrode and/or at least one the second electrode can comprise at least one cermet electrodes, i.e. metal-ceramic-electrode.Now for example relate to a kind of zirconia-platinum-electrode.But also can use in principle the cermet electrodes of other type.By adopting described measure individually or in combination, now can improve the component of the three-phase limit of metal, pottery and gas, for example improve the component of the three-phase limit of platinum, zirconia and gas.So for example can weaken the relevance of poison control centre, and electrode especially can be designed in low-temperature space more responsive.This is especially favourable for the above-mentioned sensor element not heating.In addition, also can remove the oxide layer on electrode surface and also can make thus the electrode structure must be more responsive in low-temperature space.By adopting these measures with described effect can prepare well this sensor element individually or in combination, to use as the sensor element not heating.
In the adjusting processing procedure of suggestion, measure battery and/or comprise that the assembly of measuring battery can process as mentioned above in different ways, wherein can comprise a kind of loading, to reach foregoing those effects.For example measuring battery and/or assembly can be before implementing low-temperature measurement, that is before sensor element comes into operation, at the temperature of at least 800 ℃, preferably, at higher temperature, in dense gas atmosphere, is heated.Alternatively or additionally, measure battery and/or comprise measure the assembly of battery also can be at the temperature of at least 800 ℃, preferably at higher temperature, in the gas atmosphere of alternately conversion, be heated, especially before implementing low-temperature measurement, that is before sensor element comes into operation.Also be alternatively or additionally, can be to measuring battery and/or comprising that the assembly of measuring battery carries out current load, especially at least one first electrode and/or at least one the second electrode lower than the temperature range of 800 ℃ in or at least one first electrode and/or at least one the second electrode, be at least 800 ℃, preferably lower than carrying out current load in the temperature range of 800 ℃.
When measuring battery and carry out external heating, especially when comprising that the front area of the assembly of this measurement battery carries out external heating, also can for example in the region of at least one packaging part, there is high temperature at least one seal element.In the situation that process control is suitable, also can replace by this way conventionally needed for example by the vitrifacation of the boron nitride sheet in packaging part being processed to the heating process that guarantees CSD intensity, it is commonly called AH0 heating process, wherein CSD refers to feature migration, because dense gas componant penetrates into caused signals migrate in reference region.
Accompanying drawing explanation
Embodiments of the invention are shown in the drawings and describe in detail in the following description.Shown in accompanying drawing:
Fig. 1 is according to the schematic diagram of the method for conditioning sensor element of the present invention.
Embodiment
In Fig. 1, schematically illustrated burner testing table 110, according to this burner testing table, schematically described a kind of according to method of the present invention.Burner testing table 110 comprises one with the shell 112 that regulates process chamber 114, pacifies to have received the sensor element 116 of finished product or intermediate product form in this adjustings process chamber.In the present embodiment, sensor element 116 comprises one and measures battery 118 and/or an assembly that comprises this measurement battery 118, this measurement battery can be with a kind of state with ability to work, that is for example as the layer structure that completes sintering, is provided for enforcement according to method of the present invention.Other parts of sensor element 116 are not shown, as for example case member, packaging part, plug connector or like in figure.Measure battery 118 and comprise the first electrode 120, in the present embodiment, this first electrode design becomes external electrode and can be applied in from the gas in measurement gas chamber through porous protective layer 122.Measure battery 118 and also comprise the second electrode 124, this second electrode design becomes interior electrode and separates to turn up the soil with measurement gas chamber to be configured in the inside of a floor structure measuring battery 118.In the case, the second electrode 124 is configured in reference channel 126 and for example and can to it, applies air by this passage.The first electrode 120 and the second electrode 124 are connected with each other by solid electrolyte 127.This solid electrolyte 127 can be for example the stable zirconia of ytterbium (YSZ).Electrode 120,124 can be connected on a voltage measuring apparatus and/or can be applied in an electric current (being called herein IB) and/or a voltage by the contact conductor 128 through only schematically illustrating in Fig. 1.
In regulating process chamber 114, selectively to measuring battery 118, apply an adjusting processing electric current, for example, by means of a corresponding current source, implement.Electric current symbol that preferably controlled and/or be conditioned and that preferably can have conversion is processed in the adjusting representing with IB in Fig. 1.Control device 134 is preferably arranged to affect regulate and is processed electric current I B, especially its direction and/or its size and/or its duration.For example whole burner testing table 110 can be designed to be subject to computer-controlled.
In addition, burner testing table 110 in the embodiment shown in fig. 1 preferably comprises a well heater 130.Alternatively or additionally, burner testing table 110 preferably comprises a gas supply mechanism 132, can be to regulating process chamber 114 apply the gas atmosphere of accurate restriction by it.As described in detail below, other form of implementation is also possible, for example, cancel the form of implementation of shell 112 and/or gas supply mechanism 132.In addition, burner testing table 110 can comprise a control device 134, by this control device control combustion device testing table 110 completely or partially for example, for example, control the function of the electric current supply of electrode 120,124 and/or well heater 130 and/or gas supply mechanism 132.
In the method for suggestion, implement a kind of adjusting processing procedure, in this process, preferably can implement either alone or in combination following methods step:
* before implementing actual low-temperature measurement, before sensor element 116 comes into operation, in dense gas atmosphere, be greater than other building block that adds thermal measurement battery 118 and/or sensor element 116 at the temperature of 800 ℃;
* especially before implementing low-temperature measurement, before sensor element 116 comes into operation, in the gas atmosphere of conversion, be greater than other parts that add thermal measurement battery 118 and/or sensor element 116 at the temperature of 800 ℃;
* in being less than the temperature range of 800 ℃, on the first electrode 120, to measuring battery 118 and/or sensor element 116, apply electric current;
* in more than 800 ℃ temperature ranges, on the first electrode 120, to measuring battery 118 and/or sensor element 116, apply electric current.
On the burner testing table of in vitro 850 ℃ of the reaction of dense gas componant, can implement.This reaction occurs under dense gas atmosphere, but by checker supply with diluted gas and dense gas and be reinforced by improving temperature.
Therefore, a kind of possible measure is in diluted gas and/or in air, to add thermal measurement battery 118, especially heating sensor front area.In the case meaningfully, territory, heated protective area under control only, also comprises the screw thread of heating sensor element 116 when possible.This for example can implement by the electric heater 130 of a coiling for each single sensor element 116, or for a plurality of sensor elements 116 or a plurality of measurement battery 118, can implement by an electrically heated gap (or sealing structure), measure battery 118 or sensor element 116 and can be inserted in this gap.
Dense gas operation and the diluted gas operation of checker can the most for example be implemented by means of gas flame.In theory also can especially under use bottled gas condition, implement by means of electrical heating.Also the whole assembly that will consider in principle sensor 116 comprises the heating of shell and seal member.But particularly preferably be the region that only adds thermal measurement battery 118.This determines by following situation, and due to the thermal instability of the packaging part of sensor element 116, the thermal instability of the talcum of packaging part for example can produce and damage being greater than at the temperature of 720 ℃ in many present sensors.
With respect to the heating of implementing by well heater 130, also can selectively or additionally by applying, regulate processing electric current to strengthen heating, electric current is processed in this adjusting also can be called test current feed-in.At high temperature, this can cause producing in the electrode structure of the first electrode 120 and/or the second electrode 124 variation requiring.Required precondition can be the dense gas atmosphere in regulating process chamber 114 for this reason, is enhanced and is not only from gas, to export oxygen thus to the oxygen infusion on the contact bed of electrode 120 or 124.Now the load of external electrode 120 is main in many cases.This means and preferably select in this wise direction of current, make external electrode 120 first in low electromotive force and interior electrode 124 is pumped in reference channel 126 from waste gas or from regulate process chamber 114 in high electromotive force and by oxygen.External electrode 120 therefore should be first on than the lower electromotive force of interior electrode 124.By making oxygen dilution, can in electrode and electrolytical interface zone, produce material substitution thus.In second step by making direction of current oppositely be regenerated in this region.As the significant value of typical lambda seeker, determined the electric current that continues the 10mA in 30 seconds, for reversed reaction, be the electric current that continues 30 seconds-1mA.Generally, when forward reaction, the electric current of 1mA to 30mA causes the improvement of actuation time.Now the constant of reversed reaction does not generally change.Reversed reaction should not align overreact compensation.Correspondingly, for reversed reaction, 0 μ A may be significant between the Current Zone of-30mA.The duration of current load can be for example each step by step, that is to say each the Direction of Reaction, be 30 seconds.Each step by step, the significant time interval that is to say each the Direction of Reaction is for example between 5 seconds and 90 seconds.According to current understanding, during applying electric current, need to reach enough ionic conduction abilities by the lattice of heating solid electrolyte 127.Therefore preferably make exhaust gas temperature or regulate the temperature in process chamber 114 to be greater than 800 ℃.During electric current applies, for the parameter of sensor element Temperature Key, be generally to measure the interior resistance of battery 118.During electric current applies, the interior resistance of 17 Ω generally can be realized very large improvement.This is conventionally equivalent to the exhaust gas temperature of about 1097 ℃ or regulates the temperature of the gas in process chamber 114 and the electrode temperature of about 908 ℃.Correspondingly, using at least 800 ℃, is significant more preferably greater than the electrode temperatures of 800 ℃.But applying electric current at electrode temperature in lower than the low-temperature space of 800 ℃ is also possible in principle.
In the embodiment shown in fig. 1, in order to implement described method, used a special burner testing table 110 arranging for this reason.But, alternatively or additionally, also can be to the sensor element 116 of having installed, for example the sensor element 116 being arranged in the waste gas system of internal combustion engine was implemented to described method before putting into operation first.On the sensor element 116 that the measure of advising can be implemented and/or not be mounted on the sensor element 116 of having installed, implement.But if implement this measure on the sensor element 116 not being mounted, these measures are no longer generally the poisoning materials just producing by installation process for volatilizing so.Also can complete on the sensor element 116 of assembling in principle, for example, implement these measures before or after in being installed to a device (waste gas system of internal combustion engine, especially internal combustion engine), that is implement according to method of the present invention.For example described method can complete assembling for example with the sensor element 116 of the bunch of cables being fixed on implement.But, herein especially because high temperature may produce the damage to bunch of cables in poor process control situation.Correspondingly, it is significant on an independent testing table, for example on the burner testing table 110 according to Fig. 1, implementing the method.
Claims (26)
1. for the method for conditioning sensor element (116), described sensor element is for surveying at least one characteristic at the gas of measurement gas chamber, wherein provide at least one to measure battery (118), described measurement battery (118) has at least one first electrode (120), described the first electrode (120) can be used the gas-loaded in measurement gas chamber, described measurement battery (118) also has at least one second electrode (124) is connected described the first electrode (120) and described the second electrode (124) solid electrolyte (127) with at least one, wherein, before described sensor element (116) comes into operation, make described measurement battery (118) stand at least one and regulate processing procedure, in described adjusting processing procedure, make described measurement battery (118) bear the adjusting treatment temperature of a raising, wherein, in described adjusting processing procedure, described measurement battery (118) is additionally processed to current load with regulating.
2. in accordance with the method for claim 1, wherein, described adjusting treatment temperature is at least 800 ℃.
3. in accordance with the method for claim 1, wherein, for described adjusting processing procedure is used at least one external heater (130).
4. in accordance with the method for claim 1, wherein, in described adjusting processing procedure, make at least one seal element vitrifacation of described sensor element (116).
5. in accordance with the method for claim 1, wherein, described adjusting processing procedure is implemented in a kind of gas atmosphere of restriction.
6. in accordance with the method for claim 1, wherein, described adjusting processing procedure is in the upper enforcement of a burner testing table (110).
7. in accordance with the method for claim 1, wherein, in described adjusting processing procedure, described measurement battery (118) is additionally processed to current load with regulating, wherein select in this wise described adjusting to process electric current, make described the first electrode (120) described adjusting processing procedure at least one step by step in one than the lower electromotive force of described the second electrode (124) on.
8. in accordance with the method for claim 1, wherein, described adjusting processing procedure comprises at least two step by step, and wherein said measurement battery (118) is processed current load with the different adjusting of direction of current at described at least two in step by step.
9. in accordance with the method for claim 1, wherein, in described adjusting processing procedure to described measurement battery (118) additionally with regulate processing current load, wherein said adjusting is processed electric current for 0.5mA at least.
10. in accordance with the method for claim 1, wherein, in described adjusting processing procedure to described measurement battery (118) additionally with regulate processing current load, wherein at one first, described measurement battery (118) is used in step by step adjusting between 1mA and 30mA process current load and at one second, described measurement battery (118) is used in step by step 0 μ A and-adjusting between 30mA processes current load.
11. in accordance with the method for claim 1, and wherein, the duration of described adjusting processing procedure is at least one second.
12. in accordance with the method for claim 1, and wherein, described adjusting processing procedure is arranged in a test sequence.
13. in accordance with the method for claim 1, and wherein, described sensor element (116) is for surveying the component of a gas componant.
14. in accordance with the method for claim 2, and wherein, described adjusting treatment temperature is at least 900 ℃.
15. in accordance with the method for claim 14, and wherein, described adjusting treatment temperature is at least 1000 ℃.
16. in accordance with the method for claim 5, and wherein, described adjusting processing procedure is implemented in dense gas atmosphere.
17. in accordance with the method for claim 5, and wherein, described adjusting processing procedure is implemented in the volume of air/gas mixture of having burnt.
18. in accordance with the method for claim 5, and wherein, described adjusting processing procedure is implemented in a kind of gas atmosphere of conversion.
19. in accordance with the method for claim 7, wherein, make described the first electrode (120) one first of described adjusting processing procedure step by step in one than the lower electromotive force of described the second electrode (124) on.
20. in accordance with the method for claim 7, wherein, oxygen is pumped into described the second electrode (124) from described the first electrode (120).
21. in accordance with the method for claim 9, and wherein, described adjusting is processed electric current for 1mA at least.
22. in accordance with the method for claim 21, and wherein, described adjusting is processed electric current between 1mA and 30mA.
23. in accordance with the method for claim 11, and wherein, each of described adjusting processing procedure duration is step by step at least one second.
24. in accordance with the method for claim 11, and wherein, the duration of described adjusting processing procedure is between 5 seconds and 90 seconds.
25. in accordance with the method for claim 11, and wherein, the duration of described adjusting processing procedure is at least 30 seconds.
26. in accordance with the method for claim 12, wherein, directly before or after each test procedure of described test sequence and/or between carry out described at least one regulate processing procedure.
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| DE102009026418.3 | 2009-05-22 | ||
| DE102009026418.3A DE102009026418B4 (en) | 2009-05-22 | 2009-05-22 | Conditioning of a sensor element in a burner test stand at at least 1000°C and conditioning current |
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| DE102012207751B4 (en) * | 2012-05-09 | 2016-09-08 | Continental Automotive Gmbh | Method for producing a sensor and sensor |
| US9804004B1 (en) * | 2016-05-13 | 2017-10-31 | Deere & Company | Fluid quality sensor and cover assembly |
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Also Published As
| Publication number | Publication date |
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| DE102009026418A1 (en) | 2010-11-25 |
| KR20100126209A (en) | 2010-12-01 |
| TW201105961A (en) | 2011-02-16 |
| TWI557410B (en) | 2016-11-11 |
| CN101893597A (en) | 2010-11-24 |
| KR101754695B1 (en) | 2017-07-06 |
| DE102009026418B4 (en) | 2023-07-13 |
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