EP3721063A1 - Unité de dosage de rcs pour transporter et fournir un additif liquide de purification des gaz d'échappement - Google Patents

Unité de dosage de rcs pour transporter et fournir un additif liquide de purification des gaz d'échappement

Info

Publication number
EP3721063A1
EP3721063A1 EP18815625.1A EP18815625A EP3721063A1 EP 3721063 A1 EP3721063 A1 EP 3721063A1 EP 18815625 A EP18815625 A EP 18815625A EP 3721063 A1 EP3721063 A1 EP 3721063A1
Authority
EP
European Patent Office
Prior art keywords
aluminum frame
dosing unit
scr
plastic
plastic housing
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Withdrawn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
EP18815625.1A
Other languages
German (de)
English (en)
Inventor
Sandro MULAZZANI
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.)
Vitesco Technologies Germany GmbH
Original Assignee
Vitesco Technologies Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vitesco Technologies Germany GmbH filed Critical Vitesco Technologies Germany GmbH
Publication of EP3721063A1 publication Critical patent/EP3721063A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1426—Filtration 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
    • H05B2214/03—Heating of hydrocarbons

Definitions

  • SCR dosing unit for conveying and providing a liquid exhaust gas cleaning additive
  • the invention relates to an SCR dosing unit for conveying and providing a liquid exhaust gas purification additive.
  • an SCR dosing unit can be used, for example, in a motor vehicle to promote an exhaust gas purification additive to the exhaust gas treatment device of the motor vehicle.
  • This can be, for example, an exhaust gas treatment device which is used for purifying the exhaust gases of a diesel internal combustion engine of the motor vehicle and in which the method of selective catalytic reduction (SCR) is used.
  • the exhaust gases of diesel internal combustion engines often have a high proportion of nitrogen oxide compounds, which can be reduced by the SCR process with the aid of an exhaust gas cleaning additive.
  • Urea-water solution is regularly used as the emission control additive.
  • Urea-water solution with a urea content of 32.5% is available for emission control under the trade name AdBlue®.
  • Urea-water solution is removed from the exhaust gases or converted into ammonia inside the exhaust gas.
  • the nitrogen oxide compounds in the exhaust gas in the exhaust gas treatment device then react in the SCR process to harmless substances, in particular water, nitrogen and CO2.
  • a tank is regularly required in a motor vehicle, is stored in the exhaust gas purification additive.
  • an SCR metering unit is required that removes the exhaust gas purification additive from the tank and delivers it to the exhaust treatment device.
  • the over- Licher used exhaust gas cleaning additives can freeze at low temperatures. On freezing, on the one hand, there is a volume expansion that can damage the tank, the SCR dosing unit and other components. In addition, a promotion is not possible if the exhaust gas cleaning additive is frozen.
  • PTC heating elements A type of heaters used particularly frequently in SCR metering units are so-called PTC heating elements.
  • PTC have the property of being self-regulating around a certain temperature. This means that automatically sets a certain heating temperature in the operation of such PTC heating elements.
  • PTC heating elements are made of special materials that have a temperature-dependent electrical resistance, which generates the described dependence of the heating power on the temperature.
  • PTC heating elements are relatively expensive. In addition, it is difficult to heat large areas with PTC heating elements. It is therefore known to use heat distribution structures in order to effectively dissipate the heat generated by PTC heating elements from the PTC heating elements and to distribute them over larger areas. Only then can an effective fusion of larger quantities of frozen liquid exhaust gas cleaning additive in a tank be guaranteed.
  • Heat distribution structures are usually formed of metals with good thermal conductivity, for example of aluminum. Heat distribution structures and PTC heating elements are not permanently stable in the exhaust gas cleaning additive on a regular basis. It occurs very quickly corrosion, when PTC heating elements and heat distribution structures are exposed to liquid exhaust gas cleaning additive. To avoid this, therefore, sufficient protection must be provided.
  • SCR dosing units Another problem with SCR dosing units is that manufacturing costs are a very critical factor.
  • a tank for an exhaust gas purifying additive and SCR dosing unit must be provided in a motor vehicle in addition to the tank and the fuel delivery unit. Therefore, highly integrated, compact and high performance SCR dosing units are regularly desired at low cost.
  • SCR dosing unit to promote and provide a liquid emission control additive with a particularly effective heating presented.
  • the invention relates to an SCR dosing unit for conveying and providing a liquid exhaust gas cleaning additive on a multi-part aluminum frame, wherein at least one PTC heating element forms an electrically conductive contact between a first part and a second part of the aluminum frame, with no further electrically conductive contacts between the first part and the second part of the aluminum frame and the multi-part aluminum frame is injected into a plastic housing of the SCR dosing unit.
  • the SCR dosing or SCR delivery unit may be referred to as a pump module in example.
  • the be described plastic housing of the SCR dosing unit is a housing in which the various active components that are required for the promotion and provision of liquid additive from a tank, are arranged. The most important of these components is a pump with which the actual delivery takes place.
  • sensors, valves, switches, circuit boards, etc. may be arranged as components in the SCR dosing unit.
  • the plastic housing of the SCR metering unit is usually arranged in a tank in which the exhaust gas cleaning additive is stored. Then additional suction lines from the SCR metering unit to the tank can be very short or even eliminated.
  • the PTC heating elements serve to effectively heat liquid additive in the SCR dosing unit itself or in areas directly adjacent to the SCR dosing unit within a tank.
  • said aluminum frame is provided in order to transfer the heat from the PTC heating elements well into the exhaust gas cleaning additive. This aluminum frame is directly in the plastic case of the
  • the plastic housing is made of injection molding and surrounds the aluminum frame at least in sections.
  • a used injection molding material for the plastic housing may be, for example, POM (polyoxyethylene) or HDPE (high density polyethylene)
  • the aluminum frame has been preferably inserted into this injection mold before the injection molding material is introduced into the injection mold, thus ensuring that the plastic material of the plastic housing In particular, a strong composite of the aluminum frame and the formed material housing.
  • the plastic housing surrounds the aluminum miniumrahmen preferably on both sides. In particular, the material of the plastic housing surrounds the aluminum frame on an outer side of the plastic housing.
  • the SCR dosing unit can be arranged in a tank in which the liquid exhaust gas purification additive is stored. Characterized in that the material of the plastic housing completely surrounds the aluminum frame on an outer side, prevents liquid exhaust gas cleaning additive in the tank with the aluminum frame in contact. On an inner side of the plastic housing, the aluminum frame may also be partially exposed. This means that the aluminum material on an inner side of the plastic housing is not covered with plastic material.
  • PTC heating elements can be in contact with the aluminum frame on the inside of the plastic housing, so that the heat of the PTC heating elements can be transferred to the aluminum frame.
  • PTC heating elements which are arranged distributed as evenly as possible along a circumferential direction of the plastic housing.
  • a special feature of the aluminum frame is that it consists of separate parts, namely a first part and a second part.
  • the first part of the aluminum frame and the second part of the aluminum frame are electrically isolated from each other. There are only electrically conductive contacts between the first part and the second part by the PTC heating elements.
  • the PTC heating elements form electrically conductive connections between the first part and the second part. This makes it possible to supply the PTC heating elements via the first part of the aluminum frame and the second part of the aluminum frame with electric current.
  • the first part of the aluminum frame and the second part of the aluminum miniumrahmens thus form electrical supply and discharge to the PTC heating elements. This makes it possible to ensure a uniform Be aufschlagung the PTC heating elements with electric current.
  • the electric current flows into the PTC heating elements over the entire contact area of the PTC heating elements with the first part of the aluminum frame and out of the PTC heating elements over the entire contact surface of the PTC heating elements with the second part of the aluminum frame and vice versa.
  • the PTC material of the PTC heating elements is relatively expensive.
  • This form of electrical contact makes it possible to fully utilize the PTC material.
  • the electrical contacting described here allows a complete
  • the multi-part aluminum frame is in particular a two-part aluminum frame with a first part and a second part.
  • the concept of the two-part aluminum frame can be transferred to aluminum frames with three or more parts. It is important that at least two parts exist, so that the electrical contacting of PTC heating elements over the Aluminum frame can be done.
  • each of the two parts can be subdivided into two or more further parts, which if necessary can also be electrically insulated from one another.
  • the SCR metering unit when the plastic housing forms a plastic wall having a surface and the aluminum frame is at least partially disposed within the plastic wall and the aluminum frame covers the surface of the plastic wall to at least 60%.
  • the surface of the plastic wall of the plastic housing here an imaginary surface is meant, which forms the plastic wall.
  • the plastic housing is, for example, cylindrically shaped.
  • the surface of the plastic wall of the plastic housing is a cylindrical peripheral surface and an upper lid surface and / or a lower lid surface which lies in the plastic wall or is aligned with the plastic wall.
  • the aluminum frame covers the surface of the plastic wall, it is meant that an area proportion of at least 60% is covered by the aluminum frame along the said surface.
  • SCR metering unit is arranged with the plastic housing in a tank for liquid exhaust gas cleaning additive, this allows a large-scale release of heat from the aluminum frame to the exhaust gas cleaning additive in the tank.
  • the material of the plastic wall at least partially surrounds the aluminum frame on both sides.
  • both sides is here meant that plastic material both on the tank interior directed towards the outside of the plastic wall and on the interior of the plastic housing arranged aligned inside of the plastic wall.
  • the material of the plastic wall has an insulating effect. Because the plastic material is arranged on both sides, it can be ensured that the heat introduced by the PTC heating elements into the aluminum frame will also be distributed uniformly on both sides of the plastic wall and no disproportionate heat is emitted towards the inside.
  • the SCR metering unit when the plastic housing has a top and a circumferential side wall and the first part of the aluminum frame is at least partially disposed in the top, while the second part of the aluminum frame is at least partially disposed in the circumferential Be tenwand.
  • the first part of the aluminum frame is thus largely designed in the manner of a flat surface.
  • the second part of the aluminum frame is largely formed in the manner of a cylindrical peripheral surface.
  • the SCR metering unit when the first part of the aluminum frame forms at least one extension and the at least one PTC heating element is arranged in pocket-like openings, which are each frame frame between an extension of the first part of the aluminum frame and the second part of the aluminum and form at least one electrically conductive contact.
  • an extension is meant here a partial surface extending away from the flat surface of the first part of the aluminum frame (in particular vertically).
  • This extension forms in particular a to the second part of the aluminum frame at least sectionally parallel surface.
  • An arrangement of PTC heating elements between this surface of the extension and a surface of the second part of the aluminum frame is very easy.
  • a gap between the second part of the aluminum frame and the extension is referred to as a pocket-shaped opening, in which a PTC heating element can be used easily and with little manufacturing effort.
  • several pocket-shaped openings for PTC heating elements are formed by several extensions. Particularly preferably, there are two, three or four extensions and pocket-shaped openings with PTC heating elements arranged therein.
  • the aluminum frame or on the SCR dosing unit there are a plurality of such pocket-like openings on the aluminum frame or on the SCR dosing unit, which are distributed circumferentially along the peripheral side wall. This allows a particularly uniform distribution of heat on the outside of the plastic housing of the SCR dosing unit.
  • the SCR metering unit when the plastic housing has a circumferential flange, in which the second part of the aluminum frame extends with a flange-shaped portion.
  • a circumferential flange can be used, for example, to insert the plastic housing of the SCR dosing unit in a tank bottom.
  • the aluminum frame and in particular the second part of the Alumi niumrahmens continue in this flange, has the advantage that heat can be delivered via this flange to the exhaust gas cleaning additive in the tank.
  • SCR dosing unit if at least partially electrically insulating Distanzele elements are arranged between the first part and the second part of the aluminum frame.
  • Electrically insulating spacer elements may on the one hand be formed by the plastic material of the plastic housing itself. However, electrically insulating spacers may also be present to additional, for example, such be electrically insulating spacer elements inserted in the injection mold, with which the plastic housing is made, even before injection molding material is introduced into the injection mold. Such spacers then allow accurate positioning of the first part and the second part in the plastic housing. Such spacers may also serve to protect the PTC heating elements and, for example, be arranged in a ram-shaped manner around the PTC heating elements.
  • electrical voltage source for supplying power to the at least one PTC heating element, which is adapted to generate an electrical voltage between the first part and the second part of the aluminum frame.
  • a plastic tank for a liquid exhaust gas cleaning additive comprising a tank bottom side, in which a described SCR dosing unit is arranged such that the plastic housing of the SCR dosing unit forms a tank bottom in sections, the plastic housing from the bottom of the tank into a Interior of the plastic tank extends.
  • the SCR metering unit with the plastic housing in the tank bottom to arrange or arrange on the tank that this forms part of the tank bottom, is possible, regardless of the level of the exhaust gas purification additive in the tank and in particular special at low levels of the exhaust gas purification additive in the tank to be able to effectively ensure the removal of exhaust gas cleaning additive from the tank.
  • the bottom of the tank is an accessibility of the
  • SCR dosing unit ensures, so that, for example, the maintenance of active components in the SCR dosing unit is possible.
  • an interior of the tank here another interior is meant as the interior of the plastic housing.
  • the interior of the tank surrounds in a preferred embodiment, the outside of the plastic housing.
  • a motor vehicle having an internal combustion engine, a Abgas adaptationsvor device for cleaning the exhaust gases of the internal combustion engine with an SCR catalyst for performing the method of selective catalytic reduction and a described SCR dosing unit for adding a liquid Abgasreini supply additive to the exhaust treatment device.
  • the SCR dosing unit can remove the emission control additive from a plastic tank in which the SCR dosing unit is inserted.
  • FIGS. show particularly preferred embodiments of the invention, to which the invention is not limited.
  • the figures and especially the size ratios shown in the figures are only schematic. Show it :
  • Fig. 1 a schematic plastic tank with a be
  • Fig. 2 a section through a described
  • Fig. 4 a schematic section of the aluminum frame with
  • Fig. 5 a second schematic portion of the aluminum frame with PTC heating element
  • Fig. 6 a motor vehicle.
  • Fig. 1 shows a plastic tank 19 with a tank bottom 20, which is formed by a tank bottom 21 shown schematically here and in which an SCR dosing unit 1 is used, which has the structure described here.
  • SCR metering unit 1 has a plastic housing 8, in which an aluminum frame 3 is inserted.
  • This aluminum frame 3 has a first part 6 and a second part 7.
  • the first part 6 of the aluminum frame is disposed in a top 11 of the plastic housing 8.
  • the second part of the aluminum frame is predominantly in a circumferential side wall 12 of the
  • Plastic housing 8 arranged.
  • the plastic housing 8 has a plastic wall 9, which has a surface 10.
  • PTC heating elements 4 are arranged, which form electrical conductive contacts 5 between the first part 6 and the second part 7 of the aluminum frame 3.
  • the space between the first part 6 and the second part 7, in which the PTC heating elements 4 are arranged, can also be seen as a pocket-shaped opening 14 at.
  • the first part 6 of the aluminum frame forms to form the pocket-shaped openings 14 projections 13 which extend parallel to the second part 7 of the aluminum frame.
  • the plastic housing 8 of the SCR dosing unit 1 has a circumferential flange 15, with which it is inserted into the tank bottom 21.
  • the peripheral flange 15 effectively forms a connection region of the plastic housing 8 to a tank bottom 21.
  • This flange-shaped portion 16 allows heat distribution through the flange 15.
  • the plastic housing 8 as a whole forms an invagination in an interior 22 of the plastic tank 19, the emanating from the tank bottom 21.
  • a filter 34 is provided circumferentially on the outside. The filter 34 surrounds the plastic housing 8 circumferentially.
  • Liquid Abgastherapiesad additive in the plastic tank 19 can be sucked through the filter 34 to a suction point 31, at which the liquid Ab- gas cleaning additive is removed from the tank.
  • a pump 30 is arranged, which sucks the liquid exhaust gas purification additive from the suction point 31 via a suction line 32 and to a supply port 33 promotes, to which the exhaust gas purification additive is provided.
  • the plastic housing 8 is closed by a cover 35 on a housing inner side 36 facing outwards from the top side 11, so that a closed space 37 is formed for the components of the SCR metering unit 1 (in particular for a pump 30).
  • FIG. 2 shows a section through the SCR metering unit 1 and the plastic housing 8. It can be seen how the plastic wall 9 of the plastic housing 8 forms a peripheral surface.
  • the second part 7 of the aluminum frame 3 is arranged in this circumferential side wall 12 of the plastic housing.
  • Also visible from below is a section of the first part of the aluminum frame 3, not covered by the plastic material of the plastic housing 8, with extensions 13 which extend parallel to the second part of the aluminum frame and form pocket-like openings 14 in which PTC heating elements are arranged form electrical contacts 5 between the first part 6 and the second part 7 of the aluminum frame.
  • the suction point 31, the suction line 32 and the pump 30 also shown in Fig. 1 can be seen that here along the circumferential side wall 12 a total of three
  • PTC heating elements 4 are arranged in pocket-shaped openings 14. Shown are also spacer elements 17, which ensure a distance between the first part 6 and the second part 7 of the aluminum frame.
  • 4 and 5 each show a portion of the aluminum frame 3 with the first part 6 and the second part 7 and a PTC heating element 4 arranged between them, which forms the electrical contact 5 between the first part 6 and the second part 7 ,
  • the first part 6 and the second part 7 are each connected via electrical contacts 29 to a voltage source 18 in order to supply electrical current to the PTC heating element 4.
  • 4 additionally shows spacer elements 17, which maintain a spacing between the first part 6 and the second part 7 of the aluminum frame 3.
  • Fig. 6 shows a motor vehicle 23 comprising a combus- tion combustion engine 24, and an exhaust treatment device 25 with an SCR catalyst 26 for cleaning the exhaust gases of the internal combustion engine 24.
  • the exhaust treatment device 25 is liquid exhaust gas cleaning additive 2 from a plastic tank 19 with an SCR dosing unit 1 can be fed ,
  • the SCR metering unit 1 is connected via a line 27 to an injector 28 on the exhaust gas treatment device 25.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne une unité de dosage de RCS (1) pour transporter et fournir un additif liquide de purification des gaz d'échappement (2), comprenant un cadre en aluminium (3) en plusieurs parties. Au moins un élément chauffant à CTP (4) forme un contact électriquement conducteur (5) entre une première partie (6) et une deuxième partie (7) du cadre en aluminium (3), il n'existe aucun autre contact électriquement conducteur entre la première partie (6) et la deuxième partie (7) du cadre en aluminium (3) et le cadre en aluminium (3) en plusieurs parties est moulé par injection dans un boîtier en matière plastique (8) de l'unité de dosage de RCS (1).
EP18815625.1A 2017-12-08 2018-12-05 Unité de dosage de rcs pour transporter et fournir un additif liquide de purification des gaz d'échappement Withdrawn EP3721063A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017222301.4A DE102017222301A1 (de) 2017-12-08 2017-12-08 SCR-Dosiereinheit zur Förderung und Bereitstellung eines flüssigen Abgasreinigungsadditivs
PCT/EP2018/083566 WO2019110629A1 (fr) 2017-12-08 2018-12-05 Unité de dosage de rcs pour transporter et fournir un additif liquide de purification des gaz d'échappement

Publications (1)

Publication Number Publication Date
EP3721063A1 true EP3721063A1 (fr) 2020-10-14

Family

ID=64661350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18815625.1A Withdrawn EP3721063A1 (fr) 2017-12-08 2018-12-05 Unité de dosage de rcs pour transporter et fournir un additif liquide de purification des gaz d'échappement

Country Status (6)

Country Link
US (1) US11181025B2 (fr)
EP (1) EP3721063A1 (fr)
CN (1) CN111406148B (fr)
BR (1) BR112020008600A2 (fr)
DE (1) DE102017222301A1 (fr)
WO (1) WO2019110629A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3107928B1 (fr) * 2020-03-09 2022-01-28 Vitesco Technologies Procédé de chauffage d’un boîtier renfermant au moins un organe fonctionnel

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DE10206028A1 (de) * 2002-02-14 2003-08-28 Man Nutzfahrzeuge Ag Verfahren und Vorrichtung zur Erzeugung von Ammoniak
US6892530B2 (en) * 2002-11-21 2005-05-17 Ford Global Technologies, Llc Exhaust gas aftertreatment systems
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CN111406148B (zh) 2022-08-05
DE102017222301A1 (de) 2019-06-13
US11181025B2 (en) 2021-11-23
CN111406148A (zh) 2020-07-10
US20210172360A1 (en) 2021-06-10
BR112020008600A2 (pt) 2020-10-20
WO2019110629A1 (fr) 2019-06-13

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