DE102005044545A1 - Exhaust gas purification component for cleaning an engine exhaust gas - Google Patents

Exhaust gas purification component for cleaning an engine exhaust gas

Info

Publication number
DE102005044545A1
DE102005044545A1 DE200510044545 DE102005044545A DE102005044545A1 DE 102005044545 A1 DE102005044545 A1 DE 102005044545A1 DE 200510044545 DE200510044545 DE 200510044545 DE 102005044545 A DE102005044545 A DE 102005044545A DE 102005044545 A1 DE102005044545 A1 DE 102005044545A1
Authority
DE
Germany
Prior art keywords
exhaust gas
gas purification
coating
purification component
oxygen storage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE200510044545
Other languages
German (de)
Inventor
Clemens Dipl.-Ing. Brinkmeier
Christof Dr.-Ing. Schön
Guido Dipl.-Ing. Vent
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DaimlerChrysler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Priority to DE200510044545 priority Critical patent/DE102005044545A1/en
Publication of DE102005044545A1 publication Critical patent/DE102005044545A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28Construction of catalytic reactors
    • F01N3/2803Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495Controlling the catalytic process
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/0006Catalysts containing parts with different compositions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/206Rare earth metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/90Physical characteristics of catalysts
    • B01D2255/908O2-storage component incorporated in the catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00Surface coverings
    • F01N2510/06Surface coverings for exhaust purification, e.g. catalytic reaction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00Surface coverings
    • F01N2510/06Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/16Oxygen
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/20Exhaust after-treatment
    • Y02T10/22Three way catalyst technology, i.e. oxidation or reduction at stoichiometric equivalence ratio

Abstract

An exhaust gas purification component is proposed for cleaning an engine exhaust gas, with one of a plurality of flow channels (2) traversed for the exhaust gas carrier body. At least a portion of the walls (3) of the flow channels have a coating with oxygen storage capability. DOLLAR A According to the invention, the coating with oxygen storage capability is provided for a first delimited partial area (5, 5 ', 5 ") of the carrier body and a second delimited partial area (6, 6', 6") of the carrier body is free of a coating with oxygen storage capability executed or has a coating with respect to the first portion (5; 5 '; 5' ') greatly reduced oxygen storage capacity.

Description

  • The The invention relates to an exhaust gas purification component for cleaning a Engine exhaust with the features of the preamble of Claim 1.
  • to Cleaning of engine exhaust is generally common, cylindrical Carrier body in Provide exhaust line, which of a variety of flow channels for the exhaust gas are traversed. For a catalytically supported Exhaust gas purification are the channels usually provided with a catalytically active coating on the channels is applied, so that the exhaust gas flowing through the channels in contact with the coating comes and catalyzed by the coating reactions can run off of exhaust components. Often, the coatings show an oxygen storage capability. this makes possible in particular a catalyzing of redox reactions.
  • Especially as a result of exposure to elevated temperatures may be an aging of the exhaust gas purification component with a reduction of its operability result. In an exhaust gas purification component with a coating with oxygen storage capability Aging can occur with a decrease in oxygen storage function accompanied. Such unwanted Aging effects reduce the reliability of the corresponding Emission control component.
  • task The invention is therefore an exhaust gas purification component with a improved operational reliability specify.
  • These Task is by an emission control component with the features of claim 1.
  • According to the invention Coating with oxygen storage capability for a first demarcated Part of the support body provided and a second delimited portion of the carrier body is free of a coating with oxygen storage capability accomplished or has a coating with respect to the first portion greatly reduced oxygen storage capacity.
  • When Coating preferably comes as a so-called washcoat designed coating for use. Depending on the intended function, the coating finely distributed catalytically active precious metals in particular the Contain platinum group. If the coating has an oxygen storage capacity on, so contains it is a material capable of storing oxygen such as an oxide of a rare earth element. This is homogeneous in the coating or the washcoat distributed so that the coating in this case, an overall oxygen storage capacity having. Particular preference is given to cerium oxide and / or praseodymium oxide-based oxides or mixed oxides as materials with oxygen storage capacity, which are homogeneously distributed in the coating so that the coating has an overall oxygen storage capacity. For the first Partial area is a share of about 20% to 70% of the material with oxygen storage capability in the coating preferred. For the second sub-range, however, is less than 10% preferred. However, the second portion may also be a coating which does not contain such material, or it can be perfect be executed free of a coating. For simplification becomes below for the embodiments of the first and second subareas of an OSC rich subarea and from an OSC-poor or OSC-free subarray (OSC = oxygen storage capacity).
  • By the embodiment of the invention, only a delimited portion of the carrier body with an OSC-rich To provide coating remain over the material with oxygen storage capability ongoing chemical reactions predominantly or completely limited this area of the emission control component. Consequently The heat release associated with the reactions also remains limited this area, whereby the temperature load of the exhaust gas purification component at least in the rest Areas is reduced. Because the oxygen storage capacity as a result of aging, it is also possible to by detecting the oxygen storage capacity in the OSC-rich subarea the strength of To detect or estimate aging of the exhaust gas cleaning component. Becomes too high or too fast aging, so can counteract Interventions in the operation of the internal combustion engine are made, whereby the life and the operational reliability of the exhaust gas purification component is also improved.
  • ever according to use case different shaped portions of the exhaust gas purification component as be formed first or second portion. For example can the first and / or the second portion over the entire length of Carrier body, not but over the full cross-sectional area extend. The first and / or the second subarea can become but also about the full cross-sectional area of the carrier body, but not over the whole length extend.
  • In Embodiment of the invention, the first portion extend and / or the second subsection over the entire cross section of the carrier body and are limited in the axial direction with respect to the extension of the carrier body. This embodiment is very easy to manufacture by means of a dip / suction coating.
  • In Further embodiment of the invention, the first subarea borders to the second subarea. In particular, it is provided that an OSC-rich subsection over the entire cross section of the carrier body extends and in the axial direction directly to a also on the entire cross-section extending OSC-poor or OSC-free portion borders. In this way, the transitions are clearly defined and located in the axial direction on the carrier body.
  • In Further embodiment of the invention, the first OSC-rich extends Subarea over the vast Part of the length of the carrier body. These embodiment is especially for emission control components advantageous for Their function is a large amount of oxygen storage capacity need. For example, this is the case with three-way catalysts.
  • In Further embodiment of the invention, the first, OSC-rich extends Part of a from the input side end of the carrier body in axially spaced location to the output end of the carrier body. One Input side, preferably disc-shaped portion of the support body is thus running OSC-poor or OSC-free. This avoids that oxygen-storing materials in the usually particularly temperaturbeanspruchten Entrance of the exhaust gas purification component increased aging Experienced. In addition, over the oxygen-storing material running heat-giving reactions of Entrance area shifted axially to the rear. On the other hand stands There is still enough oxygen storage capacity for the function downstream of the OSC-poor or OSC-free input area the emission control component available.
  • In Further embodiment of the invention are for the exhaust gas purification component at least two spaced-apart (OSC-rich) first portions intended. Advantageous for the function of a catalytic converter as an exhaust gas purification component it may in particular be when alternating in the axial direction several times, preferably in each case disc-shaped OSC-poor or OSC-free subareas and OSC-rich subareas follow one another.
  • In Another embodiment of the invention is the exhaust gas purification component designed as an exhaust gas catalyst. It can be like that called full catalyst or a so-called supported catalyst act. Particularly advantageous is an embodiment of the exhaust gas purification component according to the invention as a three-way catalyst.
  • In Another embodiment of the invention is the exhaust gas purification component designed as an exhaust particulate filter. These are preferably around a particle filter in a so-called wall-flow design. The channels of the particulate filter can thereby along her Gas inlet side and / or longitudinal their gas outlet side catalytically coated or substantially be free of a catalytic coating.
  • In Another embodiment of the invention are temperature sensing means for detecting the temperature of the coating with oxygen storage capability provided in the first subarea. In this way, temperature changes to be covered by over the OSC-rich coating causes ongoing redox reactions become. Leaves as a result of aging activity According to the coating, this may be based on the detected temperatures the coating can be detected. In particular, by capturing the temperature of the coating occurring during an oxygen storage Modification transition the oxygen-storing material can be detected, since this usually accompanied by a heat of color is. Based on the detected temperature of the coating with oxygen storage capability Therefore, their oxygen storage capacity can be detected. It is therefore a diagnosis of the exhaust gas purification component allows, as an aging Deterioration of the function of the oxygen-storing coating over the Temperature detection can be detected.
  • advantageous embodiments The invention is illustrated and illustrated in the drawings described below. Here are the above and to be explained below Features not only in the specified feature combination, but also usable in other combinations or in isolation, without to leave the scope of the present invention.
  • there demonstrate:
  • 1 a first advantageous embodiment of the exhaust gas purification component according to the invention,
  • 2 a second advantageous embodiment of the exhaust gas purification component according to the invention,
  • 3 a third advantageous embodiment of the exhaust gas purification component according to the invention,
  • 4 a fourth advantageous embodiment of the exhaust gas purification component according to the invention,
  • 5 a fifth advantageous embodiment of the exhaust gas purification component according to the invention,
  • 6 a first arrangement of a temperature sensor for the exhaust gas purification component according to the invention in a side view (left) and in a front view (right),
  • 7 a second arrangement of a temperature sensor for the exhaust gas purification component according to the invention in a side view,
  • 8a to 8d further advantageous embodiments of the exhaust gas purification component according to the invention in conjunction with a according to 6 arranged temperature sensor and
  • 9a to 9c further advantageous embodiments of the exhaust gas purification component according to the invention in conjunction with a according to 7 arranged temperature sensor.
  • In 1 is an exhaust gas purification component designed as a catalytic converter in a honeycomb body design 1 shown schematically. Although the catalytic converter 1 can be designed as a so-called full catalyst, in which the honeycomb body itself consists of catalytically active material, is subsequently assumed by a supported catalytic converter with a metallic or ceramic carrier body. The carrier body is of a plurality of flow channels 2 pervaded, on their walls 3 at least partially a coating is applied, which is not shown in detail. This is preferably a catalytically active coating. In terms of with the arrow 4 characterized exhaust gas flow direction is the exhaust gas catalyst 1 in its rear part 5 with an OSC-rich coating, ie provided with a coating with a comparatively large oxygen storage capacity. In contrast, significantly shorter input side portion 6 is the catalytic converter 1 however OSC-free or OSC-poor executed. The input-side subarea 6 can be carried out free of a coating or have a coating with no or with a relatively low oxygen storage capacity. From a production point of view, it is preferred if coatings on the walls 3 the flow channels 2 in the respective subareas 5 . 6 are applied approximately uniformly and the entire cross section of the catalytic converter 1 include.
  • Preferably, the in 1 illustrated embodiment of a catalyst that is used close to the engine as the first catalytic exhaust gas purification component in the exhaust system of an internal combustion engine. Such exhaust gas cleaning components are exposed to strong thermal loads, in particular in their input area, since the incoming exhaust gas can have high temperatures. Reactions of reactive exhaust constituents with oxygen stored in the catalyst and / or modification transitions of the oxygen storage material itself may further increase the temperature load on the catalyst. In order to protect the input-side region, which is important for the exhaust-gas cleaning performance, from excessively high temperatures, it may therefore be advantageous if the input region of the catalytic converter is OSC-poor or OSC-free. Advantageously, an approximately 5 mm to 50 mm, or to about 5% to 50% of its total length OSC arm or OSC-free executed input side portion 6 of the catalytic converter 1 , The directly adjacent downstream section 5 is preferably carried out uniformly OSC rich.
  • 2 shows a second advantageous embodiment of an embodiment of the invention carried out exhaust gas purification component 1 , In contrast to the embodiment of 1 Here is an input-side section 5 OSC-rich and a directly adjacent, downstream area 6 OSC-poor or OSC-free running. This embodiment is recommended when for the function of the exhaust gas purification component 1 an increased oxygen storage capacity is not required. This can, for example, in an exhaust gas purification component designed as an oxidation catalyst or as a soot filter 1 be the case. The input-side OSC-rich subarea 5 In particular, in this case, it can serve as a diagnosis area in such a way that through repeated determinations of the oxygen storage capacity of the OSC-rich subarea 5 the aging of the exhaust gas purification component 1 is determined. It is advantageous to an approximately 5 mm to 50 mm, or to about 5% to 50% of its total length OSC rich executed input side portion 5 the exhaust gas purification component 1 ,
  • 3 shows a third advantageous embodiment of an inventively designed catalytic converter 1 , In contrast to the embodiment of 1 Here is an input-side section 5 ' as well as a back section 5 OSC-rich, ie running with a coating with comparatively high oxygen storage capacity. Between the OSC-rich subareas 5 ' . 5 is an OSC-poor or OSC-free midrange 6 arranged. The middle OSC arm or OSC-free subsection 6 preferably makes up about 20% to 30% of the total length of the exhaust gas catalytic sator 1 out. The catalytic converter 1 Therefore, over the greater part of its length, it has an OSC-rich coating so that its relevant function is sufficiently available.
  • In 4 is a further advantageous embodiment of a catalytic converter 1 shown. In this embodiment, only a middle portion is 5 OSC-rich running. On the other hand, there is a directly adjacent front section 6 as well as a directly adjacent rear section 6 ' OSC-poor or OSC-free running. Such an embodiment is particularly advantageous for catalytic exhaust gas purification components in which a comparatively low oxygen storage capacity is required. This embodiment offers the advantage over a coating implemented over the entire length with a uniformly reduced oxygen storage capability that only a partial region has a reduced temperature resistance. Preferably, the middle portion makes 5 about 20% to 60% of the total length of the catalytic converter 1 out.
  • In the in 5 shown further advantageous embodiment switch OSC-rich sections 5 . 5 ' . 5 '' . 5 ''' with OSC-poor or OSC-free sections 6 . 6 ' . 6 '' . 6 ''' from. In this case, as shown, the input-side portion 6 OSC-poor or OSC-free running. However, it may also be advantageous if the input area has a coating with high oxygen storage capacity. Since, in particular, cerium-containing coatings can catalyze water gas shift reactions with the formation of hydrogen, in such a case hydrogen formed in the regions with high oxygen storage capacity can be used in the subsequent partial regions with little or no oxygen storage capability. In this way, the catalytic function of the catalytic converter 1 be extended. Preferably, each subregion makes up about 20% of the total length of the catalytic converter 1 out. The individual subregions can be made approximately the same length or different lengths.
  • Due to the embodiment according to the invention of an exhaust gas purification component having a first delimited partial region with OSC-rich coating and a second delimited OSC-poor or OSC-free partial region, an improved catalytic function of the exhaust gas purification component results. In addition, the embodiment according to the invention can be used for monitoring the exhaust gas purification component with respect to its aging. For this purpose, a temperature detection of the coating with oxygen storage capacity in the OSC-rich portion is made such that a heat of reaction of a occurring during the storage of oxygen modification transition of the material can be detected with oxygen storage capability. When oxygen is stored in the material with oxygen storage capacity, this changes from an oxygen-poor modification into an oxygen-rich modification. For example, in the case of ceria-based oxygen scavenging materials, ceria changes from its trivalent form (Ce 2 O 3 ) to tetravalent form (CeO 2 ). The corresponding oxygen uptake reaction is very rapid and exothermic, and therefore oxygen storage increases the temperature of the oxygen storage coating. Due to the nature of the temperature increase can therefore be determined whether and to what extent a modification transition occurs, ie whether and to what extent material with oxygen storage capacity is available. Since catalyst aging, for example due to exposure to elevated temperatures or poisoning, is manifested by a decrease in oxygen storage capacity, the aging state of the exhaust gas purification component can be evaluated and diagnosis made by evaluating the temperature increase in oxygen storage. For this purpose, for example, the size of the temperature increase is determined and compared with a reference value.
  • The nature and the effect of the temperature increase occurring when oxygen is stored in the material with oxygen storage capacity must be clearly distinguished from temperature increases which can occur as a result of the passage of catalysed gas reactions. While in the former case an exothermic modification transition in the material with oxygen storage capacity is the cause of the temperature increase, in the latter case these are exothermic reactions of exhaust components. The heat of reaction released with the storage of oxygen therefore acts directly in the coating itself and therefore heats it very rapidly, which is why a temperature increase also occurs when no exothermic gas reactions occur. On the other hand, gas reactions catalyzed by the coating heat the coating indirectly and are delayed, in particular, at regions of the exhaust gas purification component which are at a distance from the gas inlet. Consequently, a temperature detection made at a distance from the exhaust gas inlet can distinguish between the temperature-increasing effect of a gas oxidation and a modification transition in the coating. This means that at a distance to the exhaust gas inlet temperature measurement carried out a particularly reliable monitoring of the Abgasreini tion component can be made with determination of the existing there oxygen storage capacity. Preferably, a temperature increase occurring directly in a mode change of the internal combustion engine with a transition of reducing Abgasbe conditions with oxygen deficiency to be oxidized exhaust conditions occurring with excess oxygen is evaluated. In this way, caused by gas oxidation temperature effects can be effectively hidden.
  • The detection of the heat of reaction of the modification transition occurring when oxygen is stored in the oxygen-storing material can advantageously be carried out in exhaust-gas purification components which correspond to those disclosed in US Pat 1 and 3 Illustrated embodiments are provided from the outset predominantly with an OSC-rich coating. The temperature detection can be done only at one point in the OSC-rich coating or at several axially and / or radially offset positions.
  • For monitoring an exhaust gas purification component, for which no coating with oxygen storage capability is provided from the outset, it can be provided locally with such a coating in a comparatively small delimited partial region. By means of an evaluation of the temperature increase associated with an oxygen storage in this area, it is thus possible to monitor and diagnose components which are predominantly free from a coating with oxygen storage capability. For this purpose, it is advantageous, the exhaust gas purification component according to the in the 2 . 4 and 5 execute variants shown.
  • to Detection of the reaction heat in the case of a storage of oxygen in the material with Oxygen storage capacity occurring modification transition is preferably a temperature sensor in heat transfer connection with brought the appropriate coating. The temperature sensor is preferably in the radial or axial direction in the exhaust gas purification component introduced and with its temperature sensitive area in heat transfer contact with the OSC-rich coating.
  • In 6 is schematically a radial feed of a temperature sensor 7 in an emission control component 1 shown. The temperature-sensitive area of the temperature sensor 7 can be arranged off-center. A placement approximately at the height of the central longitudinal axis is of course also possible.
  • In 7 is schematically an axial feed of a temperature sensor 7 in an emission control component 1 shown. A placement of the temperature sensor 7 in the amount of the central longitudinal axis, as shown is not required. The sensor axis can be moved parallel to the central longitudinal axis, these cut or skewed stand to her.
  • In the case of exhaust-gas purification components which, for functional reasons, are designed predominantly free of a coating with oxygen storage capability or with a coating with low oxygen storage capacity, it may be provided to provide an OSC-rich coating only in the immediate vicinity of the temperature sensor or its temperature-sensitive area. Exemplary embodiments for radial feeds of the temperature sensor are shown in section in FIGS 8a to 8d according to the in 6 marked cutting lines A and B shown. In the 8a and 8c is one over the full length of the emission control component 1 but only part of the cross-section comprehensive sub-area 5 in which the temperature sensor 7 immersed, provided with an OSC-rich coating. In 8a this surrounds the temperature-sensitive part of the tempera ture sensor 7 - Here its tip - and extends to the outer surface of the emission control component 1 , In 8c surrounds the OSC-rich subarea 5 in the radial direction, only the temperature-sensitive area of the temperature sensor 7 , Preferably, however, according to 8b and 8d the OSC-rich subarea 5 performed comparatively short in the axial direction and only in the vicinity of the temperature sensor 7 available. In 8b surrounds the OSC-rich subarea 5 the entire feeler 7 from its entry point into the exhaust gas purification component 1 , in 8d surrounds the OSC-rich subarea 5 only the temperature-sensitive tip of the temperature sensor 7 , With the in the 8a to 8d In embodiments illustrated, it is thus possible to carry out monitoring of component aging even in exhaust-gas purification components which are predominantly designed to be poor or free from a coating with oxygen storage capability.
  • As in the 9a to 9c represented, it is also possible in an analogous manner, for example, designed as a thermocouple temperature sensor 7 axially into the exhaust gas purification component to be monitored 1 introduce. This can be achieved with an OSC-rich coating which is uniform over the entire component length or in an axial subarea or, as shown, with a merely in the immediate vicinity of the temperature-sensitive region of the temperature sensor 7 existing OSC-rich coating in heat transfer contact.

Claims (9)

  1. Exhaust gas purification component for cleaning an engine exhaust gas, with one of a plurality of flow channels ( 2 ) for the exhaust gas traversed carrier body, wherein at least a part of the walls ( 3 ) of the flow channels have a coating with oxygen storage capacity, characterized in that the coating with oxygen storage capacity for a first delimited partial area ( 5 ; 5 '; 5 '' ) of the carrier body is provided and a second delimited subregion ( 6 ; 6 '; 6 '' ) of the carrier body is designed to be free of a coating with oxygen storage capability or a coating with respect to the first portion ( 5 ; 5 '; 5 '' ) has greatly reduced oxygen storage capacity.
  2. Exhaust gas purification component according to claim 1, characterized in that the first subregion ( 5 ; 5 '; 5 '' ) and / or the second subregion ( 6 ; 6 '; 6 '' ) extend over the entire cross section of the carrier body and are limited in the axial direction with respect to the extension of the carrier body.
  3. Exhaust gas purification component according to claim 1 or 2, characterized in that the first subregion ( 5 ; 5 '; 5 '' ) to the second subsection ( 6 ; 6 '; 6 '' ) adjoins.
  4. Exhaust gas purification component according to one of claims 1 to 3, characterized in that the first subregion ( 5 ; 5 '; 5 '' ) extends over the majority of the length of the carrier body.
  5. Exhaust gas purification component according to one of claims 1 to 4, characterized in that the first subregion ( 5 ; 5 '; 5 '' ) extends from a spaced from the input side end of the carrier body in the axial direction point to the output side end of the carrier body.
  6. Exhaust gas purification component according to one of claims 1 to 4, characterized in that at least two spaced-apart first portions ( 5 ; 5 '; 5 '' ) are provided.
  7. Exhaust gas purification component according to one of claims 1 to 6, characterized in that the exhaust gas purification component ( 1 ) is designed as an exhaust gas catalyst.
  8. Exhaust gas purification component according to one of claims 1 to 7, characterized in that the exhaust gas purification component ( 1 ) is designed as an exhaust gas particle filter.
  9. Exhaust gas purification component according to one of claims 1 to 8, characterized in that temperature detection means ( 7 ) for detecting a temperature of the coating with oxygen storage capability in the first subregion ( 5 ; 5 '; 5 '' ) are provided.
DE200510044545 2005-09-17 2005-09-17 Exhaust gas purification component for cleaning an engine exhaust gas Withdrawn DE102005044545A1 (en)

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DE200510044545 DE102005044545A1 (en) 2005-09-17 2005-09-17 Exhaust gas purification component for cleaning an engine exhaust gas
PCT/EP2006/008383 WO2007031190A1 (en) 2005-09-17 2006-08-26 Exhaust gas cleaning component for cleaning an internal combustion engine exhaust gas
EP06791679A EP1924340A1 (en) 2005-09-17 2006-08-26 Exhaust gas cleaning component for cleaning an internal combustion engine exhaust gas
US12/067,105 US20090301069A1 (en) 2005-09-17 2006-08-26 Exhaust Gas Cleaning Component for Cleaning an Internal Combustion Engine Exhaust Gas
JP2008530365A JP2009508049A (en) 2005-09-17 2006-08-26 Exhaust gas purification components for purifying exhaust gas of internal combustion engines

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WO2007031190A1 (en) 2007-03-22
US20090301069A1 (en) 2009-12-10
JP2009508049A (en) 2009-02-26

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