EP1914400A1 - Abgasanlage mit einem Katalysator und einer Temperatursonde - Google Patents

Abgasanlage mit einem Katalysator und einer Temperatursonde Download PDF

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Publication number
EP1914400A1
EP1914400A1 EP07301393A EP07301393A EP1914400A1 EP 1914400 A1 EP1914400 A1 EP 1914400A1 EP 07301393 A EP07301393 A EP 07301393A EP 07301393 A EP07301393 A EP 07301393A EP 1914400 A1 EP1914400 A1 EP 1914400A1
Authority
EP
European Patent Office
Prior art keywords
exhaust line
catalytic converter
particulate filter
temperature sensor
oxidation catalyst
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.)
Granted
Application number
EP07301393A
Other languages
English (en)
French (fr)
Other versions
EP1914400B1 (de
Inventor
Marc Daneau
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.)
Renault SAS
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Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1914400A1 publication Critical patent/EP1914400A1/de
Application granted granted Critical
Publication of EP1914400B1 publication Critical patent/EP1914400B1/de
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Anticipated expiration legal-status Critical

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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
    • F01N3/02—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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust

Definitions

  • the present invention relates to a burnt gas exhaust line comprising a catalytic converter and a temperature probe opening inside the catalytic converter, the catalytic converter having two envelopes secured to one another by two fixing flanges, one of the two envelopes containing a particle filter.
  • the invention finds a particularly advantageous application in the production of exhaust lines of diesel engines and exhaust lines of spark ignition engines operating at low richness.
  • the invention also relates, on the one hand, internal combustion engines of the diesel type comprising a combustion chamber and such an exhaust line, and, on the other hand, motor vehicles comprising such an internal combustion engine.
  • an exhaust line of an internal combustion engine comprises a catalytic converter which contains at least one particulate filter. It further comprises an oxidation device disposed either directly in the particulate filter, or upstream of the particulate filter, within or outside the catalytic converter.
  • This oxidation device also called oxidation catalyst, is intended to oxidize hydrocarbons and carbon monoxide from the combustion of fuel and fresh air in the combustion chamber of the engine to prevent them are released into the atmosphere.
  • the particulate filter allows to filter and store a large part of the polluting particles (soot) rejected by the engine.
  • the flue gas evacuates with difficulty from the exhaust pipe, which generates an overpressure of the flue gas which is detrimental to the efficiency of the engine.
  • an exothermic reaction is induced within the oxidation catalyst to raise the temperature of the flue gases, so that they enter the particle filter at a temperature of the order of 650 degrees Celsius and burn the polluting particles that fill the filter.
  • a temperature sensor is disposed on the catalytic converter, so as to open between the oxidation catalyst and the particulate filter.
  • this temperature probe near the inlet of the particulate filter in order to better determine the temperature of the flue gases when they enter the filter to burn the polluting particles.
  • the document JP 2004 263593 proposes a catalytic converter of internal combustion engine comprising two envelopes secured to one another, one containing the particulate filter and the other supporting the temperature sensor.
  • the manual cleaning of the particulate filter does not require a prior disassembly of the probe.
  • the invention proposes a new inexpensive exhaust line, having a simpler and less cumbersome arrangement.
  • a burnt gas exhaust line of an internal combustion engine comprising a catalytic converter and a temperature sensor opening inside the catalytic converter, the catalytic converter having two envelopes secured to one another by two clamps, one of the two envelopes containing a particulate filter, and the fixing flange of the other envelope serving as mounting support for said temperature probe.
  • downstream and upstream are used in the direction of the flow of air, from the point of sampling the fresh air into the atmosphere until it leaves a catalytic converter. .
  • FIG. 1 there is shown a diesel-type internal combustion engine 10 of a motor vehicle (not shown).
  • This combustion engine internal 10 comprises a combustion chamber 11 defined by four cylinders 12.
  • the internal combustion engine 10 Upstream of the combustion chamber 11, the internal combustion engine 10 comprises an intake line 20 of fresh air.
  • This intake line 20 draws fresh air directly into the atmosphere and the filter by means of an air filter 21. It extends to an air distributor 22 which opens onto four intake channels 23 each connected to one of the cylinders 12 of the combustion chamber 11.
  • the intake line 20 further comprises a compressor 31 of a turbocharger 30 which compresses the fresh air filtered by the air filter 21 to inject it under pressure into the air distributor 22.
  • the internal combustion engine 10 Downstream of the combustion chamber 11, the internal combustion engine 10 comprises an exhaust line 40 of burnt gases extending from an exhaust manifold 41, connected by four exhaust channels 42 to each of the cylinders 12 of the engine. the combustion chamber 11 to the catalytic converter 45.
  • the exhaust line 40 further comprises an auxiliary oxidation catalyst 44 which is disposed upstream of the catalytic converter 45 and which partially oxidizes the flue gases leaving the combustion chamber, so that they are treated more easily and more quickly by catalytic converter 45.
  • the exhaust line 40 further comprises, upstream of the auxiliary oxidation catalyst 44, a turbine 32 which is driven by the flue gas stream and which drives the compressor 31.
  • the internal combustion engine 10 also comprises a flue gas recirculation line 60 which originates in the exhaust line 40, between the exhaust manifold 41 and the turbine 32, and which opens into the intake line 20, between the compressor 31 and the air distributor 22.
  • the recirculation line 60 comprises, at its junction with the inlet line 20, a valve 61 for regulating the flow of burnt gases reinjected into the combustion chamber 11 of the engine 10. This recirculation line 60 reduces the volume of pollutant emissions released by the internal combustion engine 10.
  • the invention relates more specifically to the exhaust line 40 and its catalytic converter 45.
  • the catalytic converter 45 has a cylinder shape consisting of two envelopes 48, 49 tubular end-to-end.
  • the first and second envelopes 48, 49 have facing ends which are bordered by first and second crown-shaped fastening flanges 48A, 49A.
  • first and second fastening flanges 48A, 49A enable the two envelopes 48, 49 to be joined to one another. For this, they are applied against each other and they comprise a plurality of axial bores 48B, 49B vis-à-vis, regularly distributed along their contour, which are traversed by devices 43 of the screw type. nut to hold the two envelopes 48, 49 securely in position relative to each other.
  • the particle filter 47 is disposed in the second casing 49 so that its inlet 47A is located at the opposite of the second fixing flange 49A, thus flush with the corresponding end of the second casing 49.
  • the oxidation catalyst 46 is disposed in the first casing 48 so that its outlet 46A is set back from the first attachment flange 48A.
  • the relative positions of the oxidation catalyst 46 and the particulate filter 47 thus define a free space 80 through which the flue gases leaving the oxidation catalyst 46 enter the particulate filter 47.
  • the oxidation catalyst 46 is in particular adapted to oxidize the HC hydrocarbons and CO carbon monoxide contained in the flue gases circulating in the exhaust line 40.
  • the particulate filter 47 is adapted to filter and store the polluting particles (also called soot) produced by the combustion of fuel and fresh air in the combustion chamber 11, so as to prevent them being rejected. in the air. This filter must be regularly regenerated so as not to be clogged by too much of the polluting particles.
  • polluting particles also called soot
  • the particulate filter 47 may optionally be lined internally with a catalytic material, such as platinum, adapted to oxidize the HC hydrocarbons and carbon monoxide CO contained in the flue gas.
  • a catalytic material such as platinum
  • the internal combustion engine 10 also comprises a device for regenerating the particulate filter 47.
  • This device comprises, in particular, fuel injection means 50 for introducing fuel directly into the fuel line. exhaust 40.
  • injection means 50 comprise in a known manner a fuel tank 51 connected to a pump 52 which draws fuel into the tank to bring it under pressure into a fuel injector 53.
  • the latter opens into the exhaust line 40, between the auxiliary oxidation catalyst 44 and the catalytic converter 45.
  • the injector 53 can send the desired amount of fuel in this pipe, at the desired time.
  • the opening and closing of the fuel injector 53 is controlled by electronic control means 70 of the internal combustion engine 10.
  • the electronic control means 70 of the internal combustion engine 10 are furthermore connected to two pressure sensors 71, 74 adapted to measure the pressure difference between the inlet and the outlet of the catalytic converter 45. This pressure difference is a function of the filling rate of the particulate filter 47 by the polluting particles.
  • the pressure sensors 71, 74 thus make it possible to determine the degree of fouling of this filter.
  • the electronic control means 70 of the engine initiate a regeneration step of the filter by injecting fuel into the exhaust line 40 by means of the fuel injector 53.
  • This injection causes a reaction A highly exothermic chemical within the oxidation catalyst 46, which increases the temperature of the flue gases entering the particulate filter 47. These gases then burn the pollutant particles stored in the particulate filter and release them into the atmosphere.
  • control means 70 are also connected to temperature probes 72, 75.
  • the first of these probes 72 is disposed between the fuel injector 53 and the catalytic converter 45, while the other temperature 75 opens into the catalytic converter 45, in the free space 80.
  • These temperature probes 72, 75 provide continuously to the control means 70 two signals representative of the temperature of the flue gases. One is representative of the temperature of these gases before they enter the catalytic converter 45, and the other is representative of the temperature of these gases when they were treated by the oxidation catalyst.
  • the control means can thus control the amount of fuel injected by the fuel injector 53 as a function of these measured temperatures, so that the flue gases have the desired temperature.
  • the temperature probe 75 which is of particular interest to us, here comprises a cylindrical base 76 at one end of which extends a rod forming a measuring end 77.
  • the first fastening flange 48A serves as mounting support for the temperature probe 75.
  • the first fastening flange 48A is radially pierced with a through bore 48C.
  • This radial bore 48C has two parts of different diameters, including an outer portion of diameter equal, with the clearance, to the diameter of the base 76 of the temperature sensor 75 and an inner portion of diameter equal, with the clearance, to the diameter of the measuring end 77 of the probe.
  • the temperature probe 75 is housed in this radial bore 48C so that its measurement end 77 opens inside the catalytic converter 45, in the free space 80, between the outlet 46A of the oxidation catalyst 46 and the inlet 47A of the particulate filter 47. Due to the positioning of the particulate filter 47 to the right of the fixing flange 49A of the second casing 49 and the positioning of the oxidation catalyst 46 recessed from the first attachment flange 48A of the first envelope 48, the measurement end 77 of the temperature sensor 75 is shifted to the input side 47A of the particle filter 47.
  • the proximity of the measuring end 77 of the temperature probe 75 and the inlet 47A of the particulate filter 47 allows the electronic control means 70 to accurately determine the temperature of the flue gases as they enter the filter. particles 47. These control means can then modulate the fuel flow injected into the exhaust line 40 of so that the temperature of the flue gases passing through the particulate filter remains precisely at the desired temperature.
  • the positioning of the temperature sensor 75 in the first casing 48 of the catalytic converter 45 allows, during maintenance operations, to be able to assemble and disassemble the particulate filter 47 of the second casing 49 of the catalytic converter 45 without affecting the the temperature probe 75.
  • these operations are easier to perform and are not likely to cause a possible adjustment of said probe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP07301393A 2006-10-09 2007-09-25 Abgasanlage mit einem Katalysator und einer Temperatursonde Active EP1914400B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0608832A FR2906837B1 (fr) 2006-10-09 2006-10-09 Ligne d'echappement pourvue d'un pot catalytique et d'une sonde de temperature.

Publications (2)

Publication Number Publication Date
EP1914400A1 true EP1914400A1 (de) 2008-04-23
EP1914400B1 EP1914400B1 (de) 2010-03-10

Family

ID=37831439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07301393A Active EP1914400B1 (de) 2006-10-09 2007-09-25 Abgasanlage mit einem Katalysator und einer Temperatursonde

Country Status (4)

Country Link
EP (1) EP1914400B1 (de)
AT (1) ATE460572T1 (de)
DE (1) DE602007005199D1 (de)
FR (1) FR2906837B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120305112A1 (en) * 2010-02-12 2012-12-06 Masataka Mitsuda Exhaust gas purifying device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030159436A1 (en) * 2002-02-27 2003-08-28 Foster Michael Ralph Diesel particulate filter ash removal
JP2004263593A (ja) * 2003-02-28 2004-09-24 Calsonic Kansei Corp ディーゼルパティキュレートフィルタ装置
US20060067860A1 (en) * 2004-09-08 2006-03-30 Faircloth Arthur E Jr Construction for an engine exhaust system component
US20060171865A1 (en) * 2005-02-01 2006-08-03 Arvin Technologies, Inc. Converter assembly with insulated sensor boss

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030159436A1 (en) * 2002-02-27 2003-08-28 Foster Michael Ralph Diesel particulate filter ash removal
JP2004263593A (ja) * 2003-02-28 2004-09-24 Calsonic Kansei Corp ディーゼルパティキュレートフィルタ装置
US20060067860A1 (en) * 2004-09-08 2006-03-30 Faircloth Arthur E Jr Construction for an engine exhaust system component
US20060171865A1 (en) * 2005-02-01 2006-08-03 Arvin Technologies, Inc. Converter assembly with insulated sensor boss

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120305112A1 (en) * 2010-02-12 2012-12-06 Masataka Mitsuda Exhaust gas purifying device
US8915071B2 (en) * 2010-02-12 2014-12-23 Yanmar Co., Ltd. Exhaust gas purifying device

Also Published As

Publication number Publication date
FR2906837B1 (fr) 2008-12-19
DE602007005199D1 (de) 2010-04-22
FR2906837A1 (fr) 2008-04-11
ATE460572T1 (de) 2010-03-15
EP1914400B1 (de) 2010-03-10

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