EP4365422A1 - Unité pouvant être chauffée électriquement - Google Patents

Unité pouvant être chauffée électriquement Download PDF

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Publication number
EP4365422A1
EP4365422A1 EP23192678.3A EP23192678A EP4365422A1 EP 4365422 A1 EP4365422 A1 EP 4365422A1 EP 23192678 A EP23192678 A EP 23192678A EP 4365422 A1 EP4365422 A1 EP 4365422A1
Authority
EP
European Patent Office
Prior art keywords
base body
electrically conductive
electrically
contact element
electrode
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.)
Pending
Application number
EP23192678.3A
Other languages
German (de)
English (en)
Inventor
Martin Straub
Steffen Ramin
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.)
Friedrich Boysen GmbH and Co KG
Original Assignee
Friedrich Boysen GmbH and Co KG
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 Friedrich Boysen GmbH and Co KG filed Critical Friedrich Boysen GmbH and Co KG
Publication of EP4365422A1 publication Critical patent/EP4365422A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust 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
    • F01N3/18—Exhaust 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 methods of operation; Control
    • F01N3/20—Exhaust 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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust 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
    • F01N3/18—Exhaust 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 methods of operation; Control
    • F01N3/20—Exhaust 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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust 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
    • F01N3/18—Exhaust 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 methods of operation; Control
    • F01N3/20—Exhaust 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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust 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
    • F01N3/24—Exhaust 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
    • F01N3/28—Construction of catalytic reactors

Definitions

  • the invention relates to an electrically heatable unit for use in a gas stream, in particular for an exhaust gas aftertreatment device - in particular for catalytic exhaust gas aftertreatment - of an internal combustion engine.
  • Catalysts are used, among other things, for exhaust gas treatment in vehicles.
  • Conventional catalysts usually comprise a base body made of electrically non-conductive ceramic (honeycomb body with channels), whereby the catalyst base body is coated with a catalyst material (for example metals from the platinum group, so-called platinum group metals - PGM).
  • the catalyst material is applied to the base body in a very thin and porous layer (so-called wash coat).
  • Catalysts can only efficiently convert pollutant emissions, i.e. convert them into less harmful gas emissions, after reaching a certain minimum temperature - also known as the "light-off temperature". This minimum temperature is around 250°C to 280°C, but can also be up to around 400°C to 800°C in aged catalysts. In order to reach these temperatures, the catalyst is heated by the hot exhaust gases from a combustion engine flowing through it. Depending on where the catalyst is located in the exhaust system, it can take some time for the catalyst to reach the required minimum temperature. Often, efforts are made to position the catalyst as close to the engine as possible in order to heat it up as efficiently and, above all, quickly as possible. Another way to reach the minimum temperature more quickly is to heat the catalyst. For this purpose, a heating disk can be provided on the catalyst base body upstream of the catalyst base body, which introduces heated air into the catalyst base body and thus preheats the catalyst.
  • Directly heated catalysts (electrically heated catalysts - EHC) help to significantly shorten the time until the light-off temperature is reached.
  • EHC electrically heated catalysts
  • the electrically heated catalyst base body is made of a conductive material.
  • a voltage applied to the conductive material leads to heating of the catalyst through the resulting potential difference due to the electrical resistance of the conductive material.
  • complete heating i.e. heating of the entire catalyst material, especially inside the catalyst, takes a certain amount of time even with the known directly heated catalysts, which in turn means that the catalyst is only fully functional after this certain amount of time in order to convert most of the pollutants from the exhaust gas into harmless substances.
  • ELS electrically conductive substrates
  • the ELS for example a semi-ceramic conductive carrier material
  • a metallic contact at suitable points, for example by a direct connection between metal and ELS, in order to transfer the electrical current from a power source (battery or power electronics/output stage) into the ELS.
  • This contact should also be selected in such a way that an effective current supply for the heating output is possible.
  • Electrodes preferably made of metal, can be provided to supply current and thus heat an electrically conductive substrate of a base body of the electrically heatable unit.
  • Direct electrical contact between the electrodes and the base body can be problematic for several reasons. For example, different thermal expansion of metals and ceramics can make a direct connection between the two components, e.g. by soldering, impossible or at least prone to errors. The connection can be severed by different expansion of the materials when exposed to heat, so that effective current supply to the base body can no longer be guaranteed.
  • a further problem can arise from possible oxidation processes on the ceramic of the base body, which can lead to an electrically passivated (non-conductive) oxide layer on the surface of the base body. It can therefore be advantageous to protect the contact from oxygen.
  • an electrically heatable unit has an electrically conductive base body and a heating device.
  • the electrically conductive base body in particular a catalyst substrate, has a current input-side end face, a current output-side end face and a peripheral surface arranged between the end faces and is flowed through by the gas flow.
  • the heating device comprises at least one first electrode and at least one second electrode.
  • At least one of the electrodes comprises an electrically conductive layer which is arranged on an outer surface of the base body or applied thereto and which is electrically conductively connected to the base body, an electrically conductive contact element arranged at a distance from the electrically conductive layer and an electrically conductive, flexible connection structure which is arranged between the electrically conductive layer and the electrically conductive contact element. is arranged and contacts both the electrically conductive layer and the electrically conductive contact element.
  • the electrically heatable unit can be designed as a cleaning unit, for example as a catalyst, or as a heating unit, for example as a heating disk.
  • the internal combustion engine can be designed as an internal combustion engine, for example as a gasoline engine or diesel engine.
  • the internal combustion engine can also implement other combustion processes, for example a Miller combustion process, or use other fuels, for example synthetic fuels or hydrogen. When such a machine is operated, pollutants are produced.
  • the pollutant concentrations can depend heavily on the operating conditions, for example on the type of fuel, the concentration of the fuel in the fuel-air mixture used, the amount of the fuel-air mixture, the speed of the internal combustion engine and/or the operating temperature of the internal combustion engine.
  • the exhaust gases produced by combustion in the internal combustion engine form a gas flow.
  • the exhaust gases are guided to the outside via an exhaust system connected to the internal combustion engine through an exhaust after-treatment device, i.e. released into the ambient air of the vehicle.
  • the exhaust after-treatment device generally comprises at least one base body through which the gas flow flows, essentially parallel to a longitudinal axis of the base body.
  • the term "essentially” refers here to the fact that the gas flow does not have to run parallel to a longitudinal axis of the base body, especially on the front face on the flow inlet side (i.e. at the inlet of the base body) and on the front face on the flow outlet side (i.e. at the outlet of the base body), for example due to the design.
  • Flow deviations for example less than 20° to a longitudinal axis of the base body, can also be possible inside the base body.
  • the essentially parallel flow of the exhaust gas to a longitudinal axis of the base body can result in a low exhaust back pressure can be achieved within the exhaust system, which reduces power loss and increased consumption of the internal combustion engine.
  • other structures of a base body through which a gas flow flows are also conceivable, for example printed structures. With such structures, flow deviations inside the structures of up to 90° to a longitudinal axis of the base body can be possible.
  • Such structures can be advantageous with regard to heat transfer from the electrically heatable unit to the gas flow flowing through or with regard to reactivity through better mixing of the gas flow.
  • the electrically conductive base body of an electrically heated catalyst (EHC), other cleaning units or other electrically heated units for use in a gas stream has often been manufactured from metal in a complex process.
  • EHC electrically heated catalyst
  • a semi-ceramic carrier material which can also be made electrically conductive and directly heatable by adding metallic additives to a ceramic substrate before the sintering process, for example, the advantages of a ceramic, such as a significantly lower density and thus weight advantages or lower production costs, can be exploited compared to metallic carriers.
  • the advantage of directly heating the ceramic base body is a higher level of efficiency and faster heating behavior, because, for example, in contrast to heatable catalysts/cleaning units that are heated using a heating disk, the heating does not have to go via the detour of heated air, i.e. the heating disk heats air that is fed to the base body of the catalyst/cleaning unit and thus indirectly heats the base body.
  • the base body In an EHC/cleaning unit with an electrically conductive substrate, the base body is directly energized and thus directly heated.
  • the electrically conductive base body of a cleaning unit such as a catalyst or a particle filter can have channels arranged in a honeycomb shape.
  • the honeycomb shape in particular the thin-walled channels, increases the surface area of the base body.
  • the thin-walled channels and the resulting increased surface area of the base body of a cleaning unit designed as a catalyst allow more exhaust gases to be converted into harmless substances from the gas flow of the internal combustion engine, since the increased surface area means that more exhaust gas volume comes into contact with the catalytically active coating (PGM WashCoat).
  • PGM WashCoat catalytically active coating
  • Precious metals such as rhodium, platinum and palladium are applied to the surface of the base body, which catalytically convert the pollutants.
  • the at least one first electrode and the at least one second electrode of the heating device are made of electrically conductive elements.
  • the first electrode can also function as an anode and the second electrode as a cathode, or vice versa.
  • the electrodes contact - directly or indirectly - the electrically conductive honeycomb structure of the base body. By applying an external voltage to the electrodes, an electrical potential difference builds up between the first electrode and the second electrode, so that an electrical current flows.
  • the electrically conductive base body represents an electrical resistance that leads to heating. With the help of a control unit, the current flow between the electrodes and thus the heating of the base body can be controlled.
  • the electrically conductive layer is made of an electrically conductive material.
  • the electrically conductive material has both temperature-stable and corrosion-resistant properties, for example heat-resistant metals such as nickel. In principle, all suitable metals that meet the requirements with regard to temperature and corrosion stability are suitable for forming the electrically conductive layer.
  • a separate electrically conductive layer can be provided for each of the at least one first electrode and at least one second electrode. However, it is also possible to use a common electrically conductive layer for electrodes with the same potential. For example, a plurality of spaced-apart first electrodes can be subjected to a positive potential by means of the control unit. The majority of the first electrodes can have a common electrically conductive layer.
  • the at least one electrically conductive layer per electrode is arranged on an outer surface of the base body.
  • the outer surface of the base body is understood to mean a side facing away from the peripheral surface surrounding the base body.
  • the electrically conductive layer can be deposited galvanically on the outer surface of the base body. The thickness of the electrically conductive layer can depend on the current strength and the duration of the current supply during the galvanic treatment of the base body. During the galvanic treatment, the base body is placed in a galvanic bath. Areas of the outer surface of the base body where no electrically conductive layer is to be applied are taped off or protected by coatings.
  • Another possibility for a targeted application or deposition of the electrically conductive layer on the outer surface of the base body can be to oxidize the base body before galvanization, whereby a non-conductive surface is applied to the outer surface of the base body. Then only target areas in which the electrically conductive layer is to be arranged are mechanically ground in order to remove the oxide layer in the target areas.
  • other methods are also conceivable, for example chemical deposition of the metallic layer or pressing on a thin metallic foil by, for example, magnetic pulse welding.
  • the electrically conductive contact element is designed to make contact with an electrically conductive connection to the control unit.
  • the contact can be arranged on an outer surface of the contact element facing away from the base body or in the contact element, for example by making a contact in a bore in the contact element.
  • the contact element can be evenly spaced from the electrically conductive layer and.
  • the contact element can have the same size as the electrically conductive layer, i.e. a projection of the contact element spaced from the electrically conductive layer onto the electrically conductive layer can lead to an overlap without overlapping of the projected area of the contact element with the area of the electrically conductive layer.
  • a two-dimensional extension (length and width) of the electrically conductive layer and a two-dimensional extension (length and width) of the contact element can be essentially the same size.
  • connection structure can completely fill a space between the electrically conductive layer and the electrically conductive contact element, at least in sections.
  • the connection structure it is also possible for the connection structure to have only individual discrete connection elements between the electrically conductive layer and the contact element.
  • the connection structure By contacting the connection structure with both the electrically conductive layer and the contact element, the connection structure represents a link between the contact element and the electrically conductive layer or the base body, which can be controlled from outside (for example from a control unit) of the electrically heatable unit via contacting the contact element and thus enables energization and heating of the base body.
  • the use of the unit according to the invention is not limited to exhaust technology. It is also possible to use the unit - in exhaust technology or in other areas - merely as a heating device with which a gas stream is heated without achieving a (catalytic) cleaning effect.
  • the electrically heatable unit can further comprise at least one first contact fixation and at least one second contact fixation.
  • the at least one first contact fixation can fix at least one first contact of the electrically conductive layer and the connection structure.
  • the at least one second contact fixation can fix at least one second contact of the connection structure and the contact element.
  • the at least one first contact fixation and the at least one second contact fixation can secure the connection structure against displacement or slipping.
  • the connection structure is still arranged flexibly between the electrically conductive layer and the contact element.
  • the connection structure can compensate for relative movements between the electrically conductive layer and the contact element without the electrically conductive connection (through the connection structure) between the electrically conductive layer and the contact element being interrupted. Fixing the connection structure can be particularly useful for mounting the electrically heatable unit in a housing (canning), since large forces and accelerations can occur here, which can cause the connection structure to shift or slip.
  • the first contact fixation and/or the second contact fixation can be designed as a solder layer at least in sections and/or can comprise solder points.
  • the contact fixations by means of a solder layer can be advantageous because all or a large number of contacts between the connection structure and the electrically conductive layer and/or between the connection structure and the contact element can be fixed almost simultaneously. If the connection structure only comprises a small number of discrete connection elements, fixing the discrete connection elements by means of individual solder points can be advantageous.
  • the electrically conductive layer can have a layer thickness of between 10 ⁇ m and 100 ⁇ m, in particular between 30 ⁇ m and 80 ⁇ m, preferably between 40 ⁇ m and 60 ⁇ m, for example 50 ⁇ m +/- 5 ⁇ m.
  • a sufficiently large layer thickness can promote both a stable electrically conductive connection between the electrically conductive layer and the electrically conductive base body, and a stable contact fixation of the electrically conductive, flexible connection structure to the electrically conductive layer.
  • a larger layer thickness can be advantageous with regard to current distribution and/or for applying a contact fixation, for example a solder layer, to the electrically conductive layer.
  • a smaller layer thickness can, however, bring advantages in order to counteract different thermal expansions of the base body and the electrically conductive layer.
  • the electrically conductive layer can extend substantially over an entire axial length in the axial direction of the base body.
  • the entire axial length of the base body can describe a spatial extension of the base body in the axial direction of an axis of symmetry of the base body, starting at the current input side end face of the base body up to the current output side end face of the base body.
  • the term "substantially” refers here to the fact that the electrically conductive layer can, for example, be formed all the way up to or close to the current input side end face and all the way up to or close to the current output side end face of the base body, i.e.
  • the at least one electrically conductive layer (and thus the at least one electrode) can be formed such that the at least one electrically conductive layer does not quite reach the edges, i.e. the current input side end face and the current output side end face, of the base body in some sections.
  • the electrically conductive layer, starting at the current input side end face of the base body can extend in the axial direction only over a maximum of 10%, 15%, 25% or up to 50% of the base body.
  • An electrically conductive layer limited in this way, starting at the current input side end face of the base body can have the advantage that an inlet area of the base body in particular can be brought quickly and efficiently to the required minimum temperature in order to clean the incoming exhaust gas. The gas heated in the inlet area then efficiently heats downstream areas of the base body.
  • two or more first electrodes and/or two or more second electrodes can be provided.
  • a more effective and targeted supply of current to the base body and thus also heating of the base body can be achieved by a plurality of first and second electrodes.
  • the two or more first electrodes can each have the same electrical potential (positive potential: plus pole or negative potential: minus pole).
  • the two or more second electrodes can have an electrical potential that is opposite to the electrical potential of the two or more first electrodes. If, for example, the two or more first electrodes have a positive potential, the two or more second electrodes can have a negative potential, and vice versa.
  • a potential difference (voltage) can build up between a first electrode and a second electrode if the first electrode has a different potential than the second electrode.
  • the at least two or more first electrodes and the At least two or more second electrodes can be arranged at a distance from one another on the peripheral surface of the base body.
  • At least one first electrode can be arranged on a peripheral surface of the base body, in particular wherein the at least one first electrode can be closed in the peripheral direction.
  • at least one second electrode can be arranged on the peripheral surface of the base body, in particular wherein the at least one second electrode can be closed in the peripheral direction.
  • the at least one first electrode can be arranged in the region of the current input-side end face on the peripheral surface of the base body.
  • the at least one second electrode can be arranged in the region of the current output-side end face on the peripheral surface of the base body.
  • At least one first electrode can be arranged on an end face of the base body and/or at least one second electrode can be arranged on an end face of the base body.
  • the at least one first electrode can be arranged on the end face of the base body on the current input side.
  • the at least one second electrode can be arranged on the end face of the base body on the current output side.
  • the electrically conductive contact element can be a sheet metal component that is curved or flat at least in sections.
  • the sheet metal component can have at least a section-wise shape of the base body and/or at least a section-wise shape of a housing in which the base body is arranged. This can enable simple assembly of the electrically heatable unit in the housing.
  • the sheet metal component can also be designed in such a way that contacting for energizing the contact element is possible; in particular, the contact element or the sheet metal part can have a recess for a sleeve.
  • the electrically conductive contact element can be made of a temperature-stable and/or corrosion-resistant material, in particular stainless steel.
  • the contact element can be exposed to high temperatures.
  • a temperature-stable or heat-resistant design of the contact element can ensure reliable functionality of the contact element even at high temperatures, for example contacting from the outside to supply power to the electrically heatable unit.
  • designing the contact element with a corrosion-resistant material can counteract a deterioration in contact capability due to oxidation.
  • the electrically conductive, flexible connection structure can have an irregular structure, in particular the connection structure can comprise a wire mesh.
  • the wire mesh can comprise a plurality of wires.
  • the wires can have a spiral, a wound, a braided or an undirected, for example a chaotic structure.
  • the irregular structure of the electrically conductive connection structure can also be formed from a flexible metal foam.
  • the irregular structure of the connection structure extends from the electrically conductive layer or from a first contact fixation to the contact element or to a second contact fixation, so that an electrically conductive connection is formed between the electrically conductive layer and the contact element through the connection structure.
  • the electrically conductive, flexible connection structure can have a regular structure, in particular the Structure has a plurality of discrete connecting elements, which are preferably prestressed in the radial direction.
  • Each of the discrete connecting elements can have a straight, angled, or directional structure.
  • the plurality of discrete connecting elements of the connecting structure can comprise individual bent sheet metal elements, each of which is clamped between the electrically conductive layer and the contact element.
  • the sheet metal elements can be punched out of the contact element at least in sections and bent in the direction of the electrically conductive layer.
  • Each of the discrete connecting elements has a length that is greater than the distance between the electrically conductive layer and the contact element.
  • each of the discrete connecting elements extends from the electrically conductive layer or from a first contact fixation to the contact element or to a second contact fixation, so that an electrically conductive connection is formed between the electrically conductive layer and the contact element through each of the discrete connecting elements.
  • the electrically heatable unit can further comprise a sleeve with an internal thread, wherein the sleeve is connected to the contact element in an electrically conductive manner and extends in the direction of the base body.
  • the sleeve can be welded onto the contact element of the electrically heatable unit.
  • the sleeve can be designed to contact the contact element, in particular to receive an electrically conductive pin via the internal thread of the sleeve. Power can thus be supplied to the electrically heatable unit via the sleeve.
  • one end of the sleeve can be essentially flush with the contact element.
  • flush in this context means that a slight overhang of the sleeve over the contact element is possible.
  • the overhang over the contact element is smaller than a distance between the housing and the contact element in the installed Condition of the electrically heated unit. This makes it possible to insert the electrically heated unit into the housing without the sleeve touching the housing. Damage to the housing or the sleeve can thus be avoided.
  • one end of the sleeve can extend into a base body bore of the base body, the base body bore having a larger diameter than a diameter of the sleeve.
  • the base body bore must be made before the heating device is mounted on the base body.
  • the base body bore is designed to accommodate one end of the sleeve without the end of the sleeve and the base body touching.
  • the electrically heatable unit can further comprise a pin that is electrically conductively connected to the contact element, wherein the pin extends in the direction away from the base body.
  • the pin can be made of an electrically conductive material.
  • One end of the pin can electrically conductively contact the contact element of the electrically heatable unit.
  • the pin can be welded onto the contact element or the pin can be screwed into the sleeve and thus electrically conductively connected to the contact element.
  • Another end of the pin can be connected to a control unit, wherein the control unit can be used to supply power to the electrically heatable unit.
  • the power supply creates a A potential difference is generated between at least two electrodes of the electrically heated unit. The potential difference can be controlled as required.
  • the electrically heatable unit can be clamped in a housing.
  • the housing can be made of a metal, for example stainless steel.
  • the housing can have an inlet and an outlet.
  • a gas flow in particular an exhaust gas flow from an internal combustion engine, can flow through the inlet.
  • the gas flow flowing into the housing can flow through the electrically heatable unit inside the housing and exit the housing again through the outlet of the housing.
  • the electrically heatable unit can be clamped in the housing by means of at least one bearing mat.
  • At least one bearing mat can be arranged between the housing and the base body, in particular between the housing and the contact element.
  • the at least one bearing mat can be made of an electrically insulating, temperature-resistant material, for example high-temperature wool.
  • the bearing mat can surround the base body of the electrically heatable unit at least in sections, in particular completely.
  • the electrically heatable unit can be fixed in the housing by means of the bearing mat and insulated from the housing.
  • two or more bearing mats can be arranged between the housing and the base body, wherein at least one bearing mat can be arranged between the housing and the contact element.
  • a first bearing mat can accommodate the heating device described here, so that the at least two electrodes of the heating device are fixed by the first bearing mat.
  • the first bearing mat can have recesses for accommodating the at least two electrodes of the heating device.
  • the first bearing mat can surround the base body of the electrically heatable unit at least in sections, in particular completely, and can be flush with an outer surface of the contact element facing the housing.
  • flush in this context means that the outer surface of the contact element facing the housing is accessible for contacting and is not covered by the first bearing mat.
  • the second bearing mat can in particular lie flat on the first bearing mat.
  • the second bearing mat can have a recess.
  • the recess in the second bearing mat can be smaller than the recess in the first bearing mat.
  • the second bearing mat covers part of the outer surface of the contact element facing the housing and thus fixes and insulates the contact element from the housing.
  • the present invention further relates to an exhaust system having an exhaust aftertreatment device with an electrically heatable unit according to at least one of the embodiments described above.
  • the invention also relates to a vehicle with an internal combustion engine connected to an exhaust system of the type described above.
  • Fig. 1A shows a perspective view of an embodiment of an electrically heatable cleaning unit 100 with a heating device for the (in the present example catalytic) treatment of a gas flow with an electrically conductive base body 102, in particular a catalyst substrate.
  • the base body 102 is cylindrical in the embodiment shown and is defined in its extent by a current input side face 110, a current output side face 112 and a
  • the base body 102 is delimited by the peripheral surface 104 arranged on the end faces 110, 112.
  • the base body 102 can also be shaped differently.
  • the base body 102 Within the space delimited by the end faces 110, 112 and the peripheral surface 104, the base body 102 has a honeycomb structure 103, the honeycomb structure 103 forming a plurality of thin-walled channels.
  • the base body 102 can be flowed through by a gas flow, in particular by an exhaust gas flow from an internal combustion engine.
  • the gas flow flows through the base body 102 in the flow direction 130 of the gas flow, with the gas flow flowing into the base body 102, in particular into the thin channels of the honeycomb structure 103, at the flow inlet side end face 110 of the base body 102.
  • the gas flow is guided in the flow direction 130 through the honeycomb structure 103 of the base body 102 until the gas flow exits again at the flow outlet side end face 112 of the base body 102.
  • the channels of the honeycomb structure 103 of the base body 102 run essentially parallel to the flow direction 130 of the gas flow.
  • the base body 102 is preferably designed to be rotationally symmetrical to an axis of symmetry A. In the embodiment shown, the axis of symmetry A corresponds to the longitudinal axis of the base body 102.
  • the heating device of the electrically heatable cleaning unit 100 comprises a first electrode 106 and a second electrode 108, which are arranged at a distance from one another on the peripheral surface 104 of the base body 102.
  • the heating device can also comprise more than one first electrode 106 and/or more than one second electrode 108.
  • the electrodes 106, 108 are electrically conductively connected to the peripheral surface 104 of the base body 102.
  • first electrode 106 and a negative electrical potential are also possible to apply. Due to the different polarity of the first electrode 106 and the second electrode 108, a potential difference (voltage) is formed between the first electrode 106 and the second electrode 108. The formation of the potential difference can be controlled as required by a control unit (not shown) which is assigned to the heating device.
  • a control unit not shown
  • an electrical current flows between the first electrode 106 and the second electrode 108.
  • the electrical current causes areas between the first electrode 106 and the second electrode 108 to heat up thermally due to an electrical resistance of the electrically conductive base body 102, and thus the base body 102 is heated.
  • At least one of the electrodes 106, 108 comprises an electrically conductive layer 114, an electrically conductive contact element 116 and an electrically conductive, flexible connection structure 118.
  • the electrically conductive layer 114 is arranged on an outer surface of the base body 102 or applied thereto. Furthermore, the electrically conductive layer 114 is electrically conductively connected to the base body 102.
  • the electrically conductive layer 114 can extend starting at the current input side end face 110 in the axial direction of the axis of symmetry A over 10%, 15%, 25%, 50% of the axial length of the base body 102 or over the entire axial length of the base body 102 and have a substantially constant layer thickness.
  • connection structure 118 and the contact element 116 of the electrodes 106, 108 have essentially the same axial extension as the electrically conductive layer 114.
  • the term "essentially” in this context means that the electrically conductive layer 114 and/or the contact element 116 may have a slightly, in the range of a few centimeters, larger axial extension than the connecting structure 118.
  • the electrically conductive contact element 116 is arranged in the radial direction away from the base body 102 at a distance from the electrically conductive layer 114.
  • the contact element 116 can be designed as a sheet metal component that is curved at least in sections. In other embodiments, the contact element 116 can also be designed to be flat at least in sections.
  • a distance between the contact element 116 and the electrically conductive layer 114 can be the same size, i.e. the contact element 116 can be arranged offset parallel to the electrically conductive layer 114.
  • connection structure 118 is arranged in the space delimited by the electrically conductive layer 114 and the contact element 116.
  • the connection structure 118 contacts both the layer 114 and the contact element 116, i.e. the connection structure 118 is electrically conductively connected to both the electrically conductive layer 114 and the electrically conductive contact element 116.
  • the connection structure 118 can be designed as an irregular structure, for example as a wire mesh, or as a regular structure with a plurality of discrete connection elements that are prestressed in the radial direction.
  • Fig. 1B shows a section of the electrically heatable cleaning unit 100 in a schematic sectional view through a cutting plane E of the embodiment according to Fig. 1A .
  • the layer structure of an electrically heatable cleaning unit 100 according to the invention shown comprises the following elements: a base body 102 with a honeycomb structure 103, for example of a catalyst, an electrically conductive layer 114, a first contact fixation 120, a connecting structure 118, a second contact fixation 121 and a contact element 116.
  • the elements are arranged in layers in a radial direction outwards, from Base body 102 away.
  • the electrically conductive layer 114 is applied to an outer surface of the base body 102.
  • the first contact fixation 120 fixes at least a first contact of the electrically conductive layer 114 and the connection structure 118.
  • the first contact fixation 120 fixes at least one point or at least one area of the connection structure 118 to the electrically conductive layer 114.
  • the connection structure 118 is fixed to the electrically conductive layer 114 against translational and rotational movements.
  • the connection structure 118 is also fixed to the contact element 116 by means of the second contact fixation 121.
  • the second contact fixation 121 consequently fixes at least a second contact of the connection structure 118 and the contact element 116.
  • the connection structure 118 is fixed to the contact element 116 by means of the second contact fixation 121 at least at one point or at least in one area.
  • the connecting structure 118 is fixed to the contact element 116 against translational and rotational movements.
  • the electrically conductive layer 114 can be made of a metal layer, for example of galvanically deposited nickel.
  • the layer 114 can protect the base body 102, for example an electrically conductive substrate, from oxidation and at the same time form a contact surface for at least a first contact fixation 120.
  • the electrically conductive layer 114 has a layer thickness that does not hinder the thermal expansion of the base body 102.
  • the layer thickness of the electrically conductive layer 114 can be between 10 ⁇ m and 100 ⁇ m, in particular between 30 ⁇ m and 80 ⁇ m, preferably between 40 ⁇ m and 60 ⁇ m (eg 50 ⁇ m +/- 5 ⁇ m).
  • the first contact fixation 120 and/or the second contact fixation 121 can be formed at least in sections as a solder layer and/or can comprise solder points (see Fig.2 ), wherein the electrically conductive layer 114 can be designed to facilitate application of the solder points or the solder layer.
  • Fig.2 shows a further section of the electrically heatable cleaning unit 100 in a schematic sectional view.
  • the first contact fixation 120 is designed in this embodiment as a plurality of solder points 122.
  • the solder points 122 can enable the connection structure 118, designed as a wire mesh 124, to be fixed to the electrically conductive layer 114 and consequently also enable the connection structure 118 or the wire mesh 124 to be fixed to the base body 102.
  • the solder points 122 (or the first contact fixation 120) can prevent or limit a relative movement of the base body 102 and the wire mesh 124 and thus counteract mechanical abrasion of the base body 102 or the wire mesh 124.
  • first contact fixation 120 in the form of solder points 122 or in the form of a solder layer (not shown) can protect the electrically conductive layer 114 at the contact points from environmental influences.
  • a second contact fixation 121 for example a further soldering by solder points 122 as a fixation between the wire mesh 124 and the contact element 116, can take place.
  • the second contact fixation can also be designed as a plurality of solder points 122 or as a solder layer and prevent or limit a relative movement of the wire mesh 124 and the contact element 116. At higher application temperatures, this soldering or a fixation of the connection structure 118 is decisive.
  • the wire mesh 124 can represent a compensating component between a ceramic of the base body 102 of a catalyst and the contact element 116.
  • the connecting structure 118 or the wire mesh 124 can compensate for different thermal expansions and create a tolerance compensation between an uneven ceramic surface of the base body 102 and the contact element 116.
  • the connecting structure 118 can provide a mechanical decoupling between the contact element 116 and the base body 102, so that, for example, forces on the Contact element 116 (e.g. via a connection pin) is not transferred directly to the ceramic of the base body 102.
  • Different embodiments of a connection structure 118 required in the respective application area can be used for the wire mesh 124 shown, in particular electrically conductive, flexible connections.
  • the electrically conductive contact element 116 can be made of a temperature-stable and/or corrosion-resistant material, in particular stainless steel.
  • the contact element 116 can promote a uniform, flat current distribution between a connection, for example by means of a pin or a sleeve, and the ceramic of the base body 102.
  • Fig.3 shows a schematic sectional view of an embodiment of an electrically heatable cleaning unit 100 with a heating device in a housing 126.
  • the layer structure of the electrically heatable cleaning unit 100 can be one of the Figures 1A , 1B and 2 described embodiments.
  • the electrically heatable cleaning unit 100 is arranged in a housing 126.
  • the housing 126 can be made of metal. Electrical insulation of the electrically heatable cleaning unit 100 from the housing 126 is achieved via an electrically insulating, optionally intumescent bearing mat 128, which is arranged between the housing 126 and the contact element 116.
  • the bearing mat 128 can also fix the electrically heatable cleaning unit 100 in the housing 126.
  • Several bearing mats 128, in particular two electrically insulating bearing mats 128 see Fig.5 ), for the insulation and fixation of the electrically heatable cleaning unit 100.
  • Fig.4 shows a schematic sectional view of another embodiment of an electrically heatable cleaning unit 100 with a heating device.
  • contact can also be made via the current input-side end face 110 and/or the current output-side end face 112.
  • a first electrode 106 can be arranged on the current input-side end face 110 of the base body 102. It must be taken into account that a sufficiently large flow of a gas stream in the flow direction 130 along an axis of symmetry A through the base body 102 is possible.
  • the first electrode 106 can be ring-shaped and arranged at least in sections on an edge region of the base body 102, so that a large part of the circular cross section (in a cylindrical design of the base body 102) can still be flowed through by the gas stream.
  • the first electrode 106 can be closed in particular in the circumferential direction.
  • the first electrode 106 can comprise a connecting structure 118 as described herein.
  • the connecting structure 118 can be designed as a wire mesh ring in accordance with the annular geometry of the first electrode 106.
  • the wire mesh ring can be applied to the base body 102 or to an electrically conductive layer 114 (in Fig.4 not shown).
  • Contacting or energizing the first electrode 106 can be done via at least one clamping contact that is arranged between the wire mesh ring and a support ring 132.
  • the support ring 132 can be arranged all the way around, on the power input side of the base body 102.
  • energizing the first electrode 106 can also be done via a connection contact that is soldered directly onto the wire mesh ring.
  • the contacting of the first electrode 106 can be electrically connected to a control unit, as described herein.
  • the first electrode 106 arranged on the current input side face 110 of the base body 102 can be fixed against a housing 126 (not shown) and electrically insulated by support rings 132.
  • the support rings 132 are made of electrically insulating material in order to prevent current from being supplied to the housing 126.
  • the second electrode 108 can be arranged on the current output-side end face 112 of the base body 102, for example centered around the axis of symmetry A of the base body 102.
  • the second electrode 108 can comprise a connecting structure 118 and a contact element 116 as described herein.
  • the connecting structure 118 can be formed as a wire mesh 124 that is soldered centrally onto the current output-side end face 112 of the base body.
  • the contact element 116 can be designed as a retaining plate that is clamped onto the wire mesh 124 in a cross or star shape, for example.
  • the retaining plate 136 can be clamped all the way around the support ring 132 arranged on the current output side.
  • the contact element 116 or the retaining plate 136 can also be soldered directly onto the connecting structure 118, designed as a wire mesh 124. Contacting or energizing the second electrode 108 can be done via a connection contact 134, which is held by means of the holding plate 136.
  • the connection contact 134 can be designed as a pin or a welded nut welded onto the contact element 116 or onto the holding plate 134, as described herein.
  • the first electrode 106 and the second electrode 108 can be designed according to one of the embodiments described herein.
  • the base body 102 is fixed in the housing 126 by at least one bearing mat 128.
  • the base body 102 can be mounted in the housing 126 via support rings 132.
  • Fig.5 shows a perspective view of an embodiment of an electrically heatable cleaning unit 100 with two bearing mats 128, 129.
  • the manufacturability of the contacting of the first electrode 106 is challenging due to the necessary insulation against the housing 126 (not shown), since the housing 126 or the canning can be exposed to high temperatures, accelerations and exhaust gas pressures.
  • the first electrode 106 is arranged in a recess of a first bearing mat 128.
  • the first bearing mat 128 is flush with the first electrode 106 or with an outer surface of the contact element 116 of the first electrode 106.
  • a second bearing mat 129 is arranged on the first bearing mat 128.
  • a recess 138 is provided in the second bearing mat 129 for contacting the first electrode 106.
  • the recess 138 of the second bearing mat 129 can expose an area of the outer surface of the contact element 116 of the first electrode 106 in such a way that this area is accessible from the outside through the housing 126.
  • the electrode 106 can therefore be contacted and energized from the outside through the housing 126.
  • the contacting of a plurality of electrodes 106, 108, in particular also the contacting of the second electrode 108 can also be made possible by a corresponding recess 138 of the bearing mat 129.
  • FIG.6 shows a schematic sectional view of an embodiment of an electrically heatable cleaning unit 100 according to Fig.3 with contact via a sleeve 140.
  • the electrode 106 which comprises at least one electrically conductive layer 114, an electrically conductive contact element 116 and an electrically conductive, flexible connection structure 118, is arranged in a first bearing mat 128.
  • the first bearing mat 128 is essentially flush with a Outer surface of the contact element 116.
  • a second bearing mat 129 rests on the first bearing mat 128, the second bearing mat 129 having a recess 138 in the area of a desired contact of the electrode 106.
  • the second bearing mat 129 with the recess 138 can provide the necessary insulation from the housing 126 and enable the contact of the contact element 116 from the outside.
  • the recess 138 on the second bearing mat 129 for contacting the contact element 116 can allow the use of axial support rings 132 (see Fig.4 ) necessary.
  • the contacting of the electrode 106 or the contact element 116 can be done via a sleeve 140 welded into the contact element 116.
  • the sleeve 140 is connected to the contact element 116 of the electrode 106 in an electrically conductive manner.
  • One end of the sleeve 140 is essentially flush with the contact element 116.
  • a slight overhang of the sleeve 140 beyond the contact element 116 is possible, but only to the extent that the sleeve 140 does not extend to the housing 126.
  • Another end of the sleeve 140 extends through the connecting structure 118 in the direction of the base body 102 in order not to hinder the introduction of the electrically heatable cleaning unit 100 into the housing 126, i.e.
  • the other end of the sleeve 140 can extend into a base body bore 142 of the base body 102, wherein the base body bore 142 has a larger diameter than a diameter of the sleeve 140.
  • an air gap is formed between the sleeve 140 and the base body 102 through the base body bore 142 and through an end of the sleeve 140 protruding into the base body bore 142, so that the sleeve 140 and the base body 102 do not touch.
  • connection of the connecting structure 118 to the electrically conductive layer 114 and the contact element 116 by means of a first contact fixing 120 and a second contact fixing 121 described here can be advantageous (not shown) in order to counteract displacement of the contact element 116 in the canning process. This enables fully automated canning.
  • a pin 144 can be introduced into the sleeve 140 via or through the recess 138.
  • the sleeve 140 can, for example, have an internal thread into which the pin 144 can be screwed.
  • the pin 144 can have a socket 146 for insulation against the housing 126.
  • the socket 146 can be made of an electrically insulating material.
  • the socket 146 can also be made of an electrically conductive material and shrunk onto the pin 144.
  • the pin 144 is ceramically coated in an area in which the pin 144 is enveloped by the socket 146, so that the pin 144 and the socket 146 are connected to one another in an electrically insulating manner.
  • the socket 146 is arranged at a distance from the contact element 116. After canning, the socket 146 can be attached to the housing 126 in a gas-tight manner, for example by welding.
  • the pin 144 can be electrically connected to a control unit (not shown). The control unit can control the formation of a potential difference between at least two electrodes 106, 108 as required.
  • Fig.7 shows a schematic sectional view of another embodiment of an electrically heatable cleaning unit 100 according to Fig.3 with contacting via a welded pin 144.
  • the contacting of the contact element 116 can also be done via an electrically conductive pin 144 welded to the contact element 116.
  • the pin 144 is connected after canning by the recess 138 of the bearing mat 129 is connected to the contact element 116 in an electrically conductive manner, for example by resistance welding or friction welding.
  • a recess in the housing 126 and the recess 138 in the bearing mat 129 are dimensioned such that the pin 144 can be guided through the recess in the housing 126 and through the recess 138 in the bearing mat 129 and can be attached to the contact element 116.
  • the pin 144 extends in the direction away from the base body 102 out of the housing 126.
  • the pin 144 can have an electrically insulating socket 146 in order to insulate the pin 144 from the metallic housing 126.
  • the socket 146 can be pre-mounted on the pin 144 or can be subsequently plugged onto the pin 144 after the pin 144 has been attached to the contact element 116, so that the socket 146 is arranged between the pin 144 and the housing 126.
  • the socket 146 can also, as in the embodiment of the Fig.6 described, be made of an electrically conductive material, wherein the socket 146 and the pin 144 are connected to one another in an electrically insulating manner.
  • the socket 146 can be attached to the housing 126 in a gas-tight manner, for example by welding. Alternatively or optionally, the socket 146 can also be arranged on a hat plate 148. Using the hat plate 148 can be advantageous if the pin 144 is not positioned precisely during canning or if the sockets 146 are not round. The socket 146 can then be pushed onto the pin 144 together or separately with the hat plate 148. The hat plate 148 is then attached to the housing 126 in a gas-tight manner, for example by welding using a circular seam, in order to close the recess in the housing 126.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
EP23192678.3A 2022-11-04 2023-08-22 Unité pouvant être chauffée électriquement Pending EP4365422A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022129142.1A DE102022129142A1 (de) 2022-11-04 2022-11-04 Elektrisch beheizbare Einheit

Publications (1)

Publication Number Publication Date
EP4365422A1 true EP4365422A1 (fr) 2024-05-08

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EP (1) EP4365422A1 (fr)
DE (1) DE102022129142A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131970A1 (de) * 1990-09-28 1992-04-09 Nissan Motor Katalytischer konverter mit einem elektrischen widerstand als katalysatortraeger
US20120076698A1 (en) * 2010-09-27 2012-03-29 Denso Corporation Honeycomb structural body and electrical heated catalyst device
EP2674209A1 (fr) * 2011-02-08 2013-12-18 Toyota Jidosha Kabushiki Kaisha Catalyseur à chauffage électrique
US20190112958A1 (en) * 2017-10-17 2019-04-18 Toyota Jidosha Kabushiki Kaisha Electrically heated catalyst
DE102019203958A1 (de) * 2018-03-29 2019-10-02 Ngk Insulators, Ltd. Träger für einen elektrischen heizkatalysator
WO2020074692A1 (fr) * 2018-10-11 2020-04-16 Vitesco Technologies GmbH Dispositif de traitement des gaz d'echappement
US20200291840A1 (en) * 2019-03-15 2020-09-17 Ngk Insulators, Ltd. Electric heating type support, exhaust gas purifying device, method for producing electric heating type support, joined body, and method for producing joined body

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7448632B2 (ja) 2020-03-05 2024-03-12 日本碍子株式会社 電気加熱式コンバータ及び電気加熱式担体

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131970A1 (de) * 1990-09-28 1992-04-09 Nissan Motor Katalytischer konverter mit einem elektrischen widerstand als katalysatortraeger
US20120076698A1 (en) * 2010-09-27 2012-03-29 Denso Corporation Honeycomb structural body and electrical heated catalyst device
EP2674209A1 (fr) * 2011-02-08 2013-12-18 Toyota Jidosha Kabushiki Kaisha Catalyseur à chauffage électrique
US20190112958A1 (en) * 2017-10-17 2019-04-18 Toyota Jidosha Kabushiki Kaisha Electrically heated catalyst
DE102019203958A1 (de) * 2018-03-29 2019-10-02 Ngk Insulators, Ltd. Träger für einen elektrischen heizkatalysator
WO2020074692A1 (fr) * 2018-10-11 2020-04-16 Vitesco Technologies GmbH Dispositif de traitement des gaz d'echappement
US20200291840A1 (en) * 2019-03-15 2020-09-17 Ngk Insulators, Ltd. Electric heating type support, exhaust gas purifying device, method for producing electric heating type support, joined body, and method for producing joined body

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