• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY In an exhaust gas purification process in an internal combustion engine, exhaust gas is passed to a particulate filter of a filter configuration and where particles of the exhaust gas are oxidized. The process comprises the step of continuously assessing (S1) the particle amount accumulated in the particle filter as a basis for avoiding avocontrollable exothermic oxidation of the particulate particle filter, the particle filter comprising catalyzing materials for influencing the oxidation rate of said oxidation. The step of continuously judging the amount of particles accumulated in the particle filter involves the use of a pre-particle filter in the filter configuration, which is configured with a catalyzing material before lower oxidation rate at said pre-particle filter. The method further comprises the step of, as a basis for said judgment, determining (S2) the occurrence of said uncontrollable exothermic oxidation by determining the temperature of the pre-particle filter, where uncontrollable exothermic oxidation takes place in the pre-particle filter before it takes place in the particle filter. A single device for exhaust gas purification in an internal combustion engine comprises the corresponding parts. (Fig. 7)
    公开号:SE1350261A1
    申请号:SE1350261
    申请日:2013-03-05
    公开日:2014-09-06
    发明作者:Magnus Mackaldener；Fredrik Swartling；Robert Nordenhök；Ola Sandström；Marcus Larsson；Fredrik Brandt；Raymond Reinmann
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    One way of detecting the amount of soot in the particulate filter is to measure the pressure difference across the filter, making an estimate at which pressure difference the limit of the amount of soot is reached. One problem is that the pressure difference across the filter depends on how soot has been introduced, which varies, among other things, with the exhaust gas temperature going up and down. This entails a large uncertainty factor, which means that a good margin is required in order not to risk sootxotherm, which in turn means that the heating function of the engine is activated at a relatively lower amount of soot, so that fuel consumption increases. An alternative variant is to estimate the amount of soot through a model that calculates how much soot gets stuck in the filter. This method also entails a large uncertainty factor and consequently requires a good margin with corresponding disadvantages as for the variant with detection of the pressure difference across the filter.
    OBJECT OF THE INVENTION An object of the invention is to provide a method for exhaust gas purification in an internal combustion engine where exhaust gas is passed through a particulate filter of a filter configuration and where particles of the exhaust gas are oxidized which enables more accurate assessment of the particulate filter accumulated particulate matter.
    SUMMARY OF THE INVENTION These and other objects, which appear from the following description, are achieved by means of a method and a device for exhaust gas purification as well as an internal combustion engine and a motor vehicle of the kind initially indicated and further having the features set forth in the characterizing part of the independent claims. Preferred embodiments of the method and device are defined in the dependent claims.
    According to the invention, the objects are achieved with a method for exhaust gas purification in an internal combustion engine where exhaust gas is passed through a particulate filter of a filter configuration and where particles of the exhaust gas are oxidized in the particulate filter comprising the step of continuously assessing the particulate filter accumulated in the particulate filter. oxidation of particles in the particulate filter and wherein the particulate filter comprises catalytic materials for influencing oxidation rate of said oxidation, the step of continuously assessing the amount of particles accumulated in the particulate filter comprising utilizing a pre-particulate filter of the filter configuration configured with a lowering oxidant filter. , and the step of, as a basis for said assessment, determining the occurrence of said uncontrollable exothermic oxidation by determining the temperature of the pre-particle filter which ok uncontrollable exothermic oxidation occurs in the pre-particle filter before it occurs in the particle filter. This enables more accurate assessment of the particle filter accumulated particle amount compared to estimating the particle amount by measuring the pressure difference across the particle filter or modeling the particle amount because such a pre-particle filter better captures the physics that control accumulation of particles in the particle filter. By making a more accurate assessment of the particulate filter accumulated particle amount thereby possible and consequently the uncertainty factor is reduced, a larger amount of particulate matter was allowed in the particulate filter before the heating function of the internal combustion engine is activated, which consequently leads to reduced fuel consumption.
    According to one embodiment of the method, the step of determining said behavior involves determining the temperature downstream of the pre-particle filter.
    This makes it possible to easily determine the temperature at which uncontrollable exothermic oxidation takes place in the pre-particle filter.
    According to one embodiment of the method, the pre-particle filter is configured to count an uncontrollable exothermic oxidation. This makes it possible to reuse the pre-particle filter in the event of uncontrollable exothermic oxidation in it. According to one embodiment of the process, the particulate filter configuration is arranged downstream of an oxidizing catalyst configured for pretreatment of exhaust gas.
    According to an embodiment of the method, said pre-particle filter is arranged upstream of said particle filter. This makes it possible to utilize an existing means for determining temperature in that a temperature sensor for determining temperature downstream of the oxidizing catalyst can thereby be used.
    According to one embodiment of the method, the pre-particle filter is integrated with the particle filter. This enables space efficiency arranged by the filter configurator.
    According to the invention, the objects are achieved with an exhaust gas purification device in an internal combustion engine where exhaust gas is intended to pass a particulate filter of a filter configuration and wherein particles of the exhaust gas are intended to be oxidized in the particulate filter comprising means for continuously assessing accumulated particulate matter. exothermic oxidation of particles in the particulate filter and wherein the particulate filter comprises catalytic materials for influencing oxidation rate of said oxidation, said means for continuously assessing the amount of particles accumulated in the particulate filter including a pre-particulate filter of the filter configuration configured in a lower oxidizing material. pre-particle filter, and means for determining, as a basis for said assessment, the occurrence of said uncontrollable exothermic oxidation by determining the temperature of the pre-particle filter. This enables more accurate assessment of the particle amount accumulated in the particle filter compared to estimating the particle amount by measuring the pressure difference across the particle filter or modeling the particle amount because such a pre-particle filter better captures the physics that control accumulation of particles in the particle filter. By enabling a more accurate assessment of the particulate filter 10 accumulated particulate filter 10 and thereby reducing the uncertainty factor, a larger amount of particulate matter was allowed in the particulate filter before the heating function of the internal combustion engine is activated, which consequently leads to reduced fuel consumption.
    According to one embodiment of the device, said means for determining said means for determining temperature downstream of the pre-particle filter is included. This makes it possible to easily determine the temperature at which uncontrollable exothermic oxidation takes place in the pre-particle filter.
    According to one embodiment of the device, the pre-particle filter is configured to withstand an uncontrollable exothermic oxidation.
    According to one embodiment of the device, the particle filter configuration is arranged downstream of an oxidizing catalyst configured for pre-treatment of exhaust gas.
    According to an embodiment of the device, the pre-particle filter is arranged upstream of said particle filter. This makes it possible to utilize an existing means for determining temperature in that a temperature sensor for determining temperature downstream of the oxidizing catalyst can thereby be used.
    According to an embodiment of the device, the pre-particle filter is integrated with said particle filter. This enables space efficiency arranged by the filter configuration.
    According to an embodiment of the device, the pre-particle filter is arranged in a space of said particle filter. This enables space efficiency arranged by the filter configuration.
    According to an embodiment of the device, said space is arranged to pass through the particle filter. This results in a pressure drop across the pre-particle filter which is similar to the pressure drop across the particle filter, a particle accumulation similar to that of the particle filter also being obtained in the pre-particle filter.
    Furthermore, this reduces the risk of the particle filter burning during uncontrolled exothermic oxidation of the pre-particle filter.
    DESCRIPTION OF THE DRAWINGS The invention will be better understood with reference to the following detailed description read in conjunction with the accompanying drawings exemplifying the invention, in which like reference numerals refer to like parts throughout the many views, and in which: Fig. 1 schematically illustrates a motor vehicle equipped with an internal combustion engine and equipped with exhaust gas purification devices; Figs. 2 - 5 schematically illustrate different devices for exhaust gas purification at an internal combustion engine; Fig. 6 schematically illustrates the particle oxidation rate as a function of the temperature of a pre-particle filter and a particle filter of filter configuration of an exhaust gas purifier; and Fig. 7 schematically illustrates a block diagram of a method of exhaust gas purification at an internal combustion engine.
    DESCRIPTION OF EMBODIMENTS Fig. 1 schematically illustrates a motor vehicle 1 in the form of a heavy vehicle, more particularly a truck. The vehicle comprises a device I; ll; lll; IV for exhaust gas purification, which can be designed in different ways as described in more detail below. Fig. 2 schematically illustrates a device 1 for exhaust gas purification at an internal combustion engine 10 according to a first embodiment. The exhaust gas purification device 1 comprises a filter configuration 20 arranged in an exhaust pipe 30 for exhaust gases F formed during combustion of an internal combustion engine 10 connected to the exhaust pipe 30. The exhaust gases F are intended to pass the filter configuration 20. The internal combustion engine 10 may be, for example, a diesel engine.
    The filter configuration 20 comprises a particle filter 22 in which particles of the exhaust gas F are intended to be oxidized. The particulate filter 22 comprises catalyzing materials for influencing the oxidation rate of said oxidation.
    The particulate filter 22 is configured and dimensioned and arranged in the exhaust pipe 30 so that particles in the exhaust gas F are captured by the particulate filter 22.
    The particulate filter 22 may be any suitable particulate filter 22 which can filter out exhaust particles such as soot particles.
    The filter configuration 20 further includes a pre-particle filter 24.
    The pre-particulate filter 24 is configured with a catalytic material for a lower oxidation rate in the pre-particulate filter 24 than the oxidation rate in the particulate filter 22. The catalytic material of the particulate filter 22 and the pre-particulate filter 24 is a variant of noble metal, according to a variant of so-called platinum group metals, PGIVI , where the amount of noble metal per unit volume of the particulate filter 22 is greater than that of the pre-particulate filter 24. As a result of rising exhaust gas temperature, the oxidation rate will increase more slowly in the pre-particulate filter 24 than in the particulate filter 22, as shown in Fig. 5.
    The pre-particle filter 24 is configured to withstand an uncontrollable exothermic oxidation. This makes it possible to reuse the pre-particle filter 24 in the event of uncontrollable exothermic oxidation therein. According to a variant, the pre-particle filter 24 is composed of a material comprising silicon carbide configured to withstand an uncontrollable exothermic oxidation. The particle filter 22 is according to a variant composed of a material including Kordierit which is cost effective and enables manufacture in relatively larger dimensions compared to, for example, silicon carbide.
    The exhaust gases F in the exhaust pipe are arranged to pass an oxidizing catalyst 40 arranged upstream of the filter configuration 20 for pre-combustion of exhaust gas, including, inter alia, oxidation of hydrocarbon and oxidation of nitrogen monoxide to nitrogen dioxide. The oxidizing catalyst 40 is, in a variant, a hydrocarbon oxidizing catalyst.
    According to the embodiment illustrated in Fig. 2, the pre-particle filter 24 of the filter configuration 20 is arranged upstream of the particle filter 22 and consequently downstream of the oxidizing catalyst 40.
    The device comprises means for continuously assessing the amount of particles accumulated in the particle filter as a basis for avoiding uncontrollable exothermic oxidation of particles in the particle filter.
    The means for continuously judging the amount of particles accumulated in the particle filter 22 comprises the pre-particle filter 24.
    The means for continuously assessing the amount of particles accumulated in the particulate filter 22 further comprises means for determining the occurrence of said uncontrollable exothermic oxidation by determining the temperature of the pre-particulate filter 24, including means 50 for determining the temperature downstream of the pre-particulate filter 50. .
    Because the pre-particle filter 24 is configured with a catalyzing material for a lower oxidation rate in the pre-particle filter 24 than the oxidation rate in the particle filter 22, uncontrollable exothermic oxidation occurs in the pre-particle filter 24 before it occurs in the particle filter 22.
    By detecting the temperature downstream of the pre-particulate filter 24 by means of the means 50 for determining the temperature downstream of the pre-particulate filter 24, here by means of a temperature sensor the occurrence of uncontrollable thermal oxidation in the pre-particulate filter 24 can be determined to avoid uncontrollable thermal oxidation in the particulate filter 22.
    The device I is configured so that, when an uncontrollable thermal oxidation is detected by detecting the temperature downstream of the pre-particle filter 24, a heating function of the engine 10 is activated to heat the exhaust gases in the exhaust pipe 30 so as to avoid uncontrollable thermal oxidation in the particulate filter 22.
    According to a preferred variant, the pre-particle filter 24 is dimensioned substantially smaller than the particle filter 22. According to a variant, the volume of the pre-particle filter 24 is in the order of 1 per mille to 5 percent of the volume of the particle filter 22. According to a variant, the surface of the pre-particle filter 24 is arranged to receive particles. percent to 10 percent of the surface of the particle filter 22. According to one embodiment, the pre-particle filter 24 is dimensioned so that the thermal energy formed in the pre-particle filter 24 does not significantly affect the particle filter 22. Because the pre-particle filter 24 is substantially smaller than the particle filter 22, oxidation in the pre-particle filter 24 is a relatively high thermal peak, but the thermal energy which is thereby transferred to the particle filter 22 is negligible in this context.
    The pre-particulate filter 24 may be oriented in any suitable manner relative to the particulate filter 22. According to a variant, the pre-particulate filter 24 is arranged to be aligned with a central area of the particulate filter 22 to the extent of the exhaust pipe 30.
    Thus, by utilizing a pre-particle filter 24, more accurate assessment of the particle amount accumulated in the particle filter 22 is possible compared to estimating the particle amount by measuring the pressure difference across the particle filter or modeling the particle amount because such a pre-particle filter 24 better captures the particle filter. . By enabling a more accurate assessment of the particulate filter 22 accumulated particle amount thereby enabling and consequently reducing the uncertainty factor, larger particulate matter in the particulate filter is allowed before the heating function of the internal combustion engine 10 is activated which consequently results in reduced fuel consumption.
    Because the pre-particle filter according to the embodiment in Fig. 2 is arranged upstream of the particle filter 24 but downstream of the oxidizing catalyst 40, it is possible to use existing means 50 for determining temperature in that temperature sensor for determining temperature downstream of the oxidizing catalyst 40 can thereby be used.
    Fig. 3 schematically illustrates a device 11 for exhaust gas purification at an internal combustion engine 10 according to a second embodiment.
    The device 11 according to the embodiment illustrated in Fig. 3 differs from the device 1 according to the embodiment illustrated in Fig. 2 substantially by the design of the filter configuration 120 and how the pre-particle filter 124 is arranged relative to the particle filter 122.
    According to this embodiment, the pre-particle filter 124 is integrated with the particle filter 122. The pre-particle filter 124 is arranged in a space 160 of the particle filter.
    The space 160 is according to this variant arranged in a central area of the particle filter 122.
    The space 160 according to this embodiment consists of a blind heel whose opening faces the oxidizing catalyst 40. Thus, integrating the pre-particle filter 124 with the particle filter 122 makes space-efficiently arranged by the filter configuration 120 possible.
    The device according to this embodiment comprises means 150 for determining temperature downstream of the pre-particle filter 124, here including a temperature sensor 150 arranged downstream of the pre-particle filter 124. According to this variant, the temperature sensor 150 is integrated with the particle filter. In this case, the temperature sensor 150 is used in addition to the temperature sensor 50 arranged between the filter configuration 120 and the oxidizing catalyst 40.
    Fig. 4 schematically illustrates a device III for exhaust gas purification at an internal combustion engine 10 according to a third embodiment.
    The device 11 according to the embodiment illustrated in Fig. 4 differs from the device 11 according to the embodiment illustrated in Fig. 3 substantially by the design of the space 260 in which the pre-particle felt 224 of the filter configuration 220 is arranged.
    According to this embodiment, the space 260 is arranged to pass through the particle filter 222, the pre-particle filter 224 arranged in the space being arranged in the portion closest to the oxidizing catalyst 40 of the space 260 in the particle filter 222. This reduces the risk of the particle filter 222 burning in uncontrolled exothermic oxide filtration.
    The device 111 according to this embodiment comprises means 250 for determining temperature downstream of the pre-particle filter 224, here including a temperature sensor 250 arranged downstream of the pre-particle filter 224. According to this embodiment the temperature sensor 250 is arranged downstream of the particle filter 222 in connection with the opener 260. 50 arranged between the filter configuration 220 and the oxidizing catalyst 40.
    Fig. 5 schematically illustrates a device IV for exhaust gas purification at an internal combustion engine 10 according to a fourth embodiment.
    The device IV according to the embodiment illustrated in Fig. 5 differs from the device III according to the embodiment illustrated in Fig. 4 substantially by the pre-particle felt 324 of the filter configuration 320.
    According to this embodiment, the space 360 is arranged to pass through the particle filter 322, the pre-particle filter 324 arranged in the space being arranged throughout the particle filter 322. Thereby a pressure drop 12 is obtained over the pre-particle filter 324 which is similar to the pressure drop across the particle filter 322. 322 is also obtained in the pre-particle filter 324. Furthermore, this reduces the risk of the particle filter 322 being burned by uncontrolled exothermic oxidation of the pre-particle filter 324.
    The device IV according to this embodiment comprises means 350 for determining temperature downstream of the pre-particle filter 324, here including a temperature sensor 350 arranged downstream of the pre-particle filter 324. According to this embodiment, the temperature sensor 350 is arranged downstream of the particle filter 322 in connection with said temperature 50 arranged between the filter configuration 320 and the oxidizing catalyst 40.
    Fig. 6 schematically illustrates the particle oxidation rate v as a function of the temperature of the pre-particle filter and the particle filter of the filter configuration of the device according to the invention. Curve P1 shows the oxidation rate as a function of the exhaust gas temperature T of the particulate filter and curve P2 the oxidation rate as a function of the exhaust gas temperature T of the pre-particulate filter. Consequently, with rising exhaust temperature T, the oxidation rate v increases more slowly in the pre-particle filter than in the particle filter because the pre-particle filter is configured with a catalyzing material for a lower oxidation rate. In this case, uncontrolled thermal oxidation takes place in the pre-particle filter before it takes place in the particle filter, whereby, by detecting the temperature downstream of the pre-particle filter, the occurrence of uncontrollable thermal oxidation in the pre-particle filter can be determined to avoid uncontrollable thermal oxidation in the particle filter.
    Fig. 7 schematically illustrates a block diagram of a method for exhaust gas purification at an internal combustion engine according to an embodiment of the invention.
    According to one embodiment, the method of exhaust gas purification at an internal combustion engine comprises a first stage S1. oxidation comprising utilizing a pre-particle filter of the filter configuration, which is configured with a catalyzing material for a lower oxidation rate in said pre-particle filter. According to one embodiment, the method of exhaust gas purification at an internal combustion engine comprises a second stage S2. In this step, as a basis for said assessment, the occurrence of said uncontrollable exothermic oxidation is determined by determining the temperature of the pre-particle filter, which uncontrollable exothermic oxidation takes place in the pre-particle filter before it takes place in the particle filter.
    权利要求:
    Claims (16)
    [1]
    A method of exhaust gas purification in an internal combustion engine wherein exhaust gas is passed through a particulate filter (22; 122; 222; 322) of a filter configuration (20; 120; 220; 320) and wherein particles of the exhaust gas are oxidized in said particulate filter (22; 122; 222; 322), comprising the step of continuously assessing (S1) in the particulate filter accumulated particulate matter as a basis for avoiding uncontrollable exothermic oxidation of particles in the particulate filter (22; 122; 222; 322) and where the particulate filter (22; 122; 222; 322) comprises catalyzing materials for influencing the oxidation rate of said oxidation, characterized in that the step of continuously judging in the particle filter (22; 122; 222; 322) accumulated particle amount involves the use of a pre-particle filter (24; 124; 224; 324) of the filter configuration (20; 120; 220; 320), which is configured with a catalyzing material for a lower oxidation rate in said pre-particle filter (24; 124; 224; 324), and the step of, as a support for said then assessing, determining (S2) the occurrence of said uncontrollable exothermic oxidation by determining the temperature of the pre-particle filter (24; 124; 224; 324), which uncontrollable exothermic oxidation occurs in the pre-particle filter (24; 124; 224; 324) before it occurs in the particle filter (22; 122; 222; 322).
    [2]
    The method of claim 1, wherein the step of determining said behavior comprises determining temperature downstream of the pre-particle filter (24; 124; 224; 324)
    [3]
    The method of claim 1 or 2, wherein the pre-particle filter (24; 124; 224; 324) is configured to withstand an uncontrollable exothermic oxidation.
    [4]
    A method according to any one of claims 1-3, wherein the particle filter configuration (20; 120; 220; 320) is arranged downstream of an oxidizing catalyst configured for pretreatment of exhaust gas.
    [5]
    A method according to claim 4, wherein the pre-particle filter (24) is arranged upstream of the particle filter (22). 10 15 20 25 15
    [6]
    The method of claim 4, wherein the pre-particle filter (124; 224; 324) is integrated with the particle filter (122; 222; 322).
    [7]
    Device (|; ll; lll; IV) for exhaust gas purification at an internal combustion engine (10) where exhaust gas (F) is intended to pass a particulate filter (22; 122; 222; 322) of a filter configuration (20; 120; 220; 320) and wherein particles of the exhaust gas are intended to be oxidized in said particulate filter (22; 122; 222; 322) comprising means for continuously assessing in the particulate filter (22; 122; 222; 322) accumulated particle amount as a basis for avoiding uncontrollable exothermic oxidation of particles in the particle filter (22; 122; 222; 322) and wherein the particle filter comprises catalytic materials for influencing the oxidation rate of said oxidation, characterized in that said means for continuously judging in the particle filter (22; 122; 222; 322) includes accumulated particle amount a pre-particle filter (24; 124; 224; 324) of the filter configuration (20; 120; 220; 320), which is configured with a catalyzing material for a lower oxidation rate in said pre-particle filter (24; 124; 224; 324), and agent (50; 150; 250; 350) to determine, as a basis for said assessment, the occurrence of said uncontrollable exothermic oxidation by determining the temperature of the pre-particle filter (24; 124; 224; 324).
    [8]
    The device of claim 7, wherein said means for determining said behavior includes means (50; 150; 250; 350) for determining temperature downstream of the pre-particle filter (24; 124; 224; 324).
    [9]
    The device of claim 7 or 8, wherein the pre-particle filter (24; 124; 224; 324) is configured to tolerate an uncontrollable exothermic oxidation.
    [10]
    Device according to any one of claims 7-9, wherein the particle filter configuration (20; 120; 220; 320) is arranged downstream of an oxidizing catalyst (40) configured for pre-treatment of exhaust gas.
    [11]
    The device of claim 10, wherein the pre-particle filter (24) is disposed upstream of the particle filter (22). 10 16
    [12]
    The device of claim 10, wherein the pre-particle filter (124; 224; 324) is integrated with the particle filter (122; 222).
    [13]
    Device according to claim 12, wherein the pre-particle filter (124; 224; 324) is arranged in a space (160; 260; 360) of the particle filter (122; 222; 322).
    [14]
    The device of claim 13, wherein said space (260; 360) is arranged to pass through said particle filter (222; 322).
    [15]
    Internal combustion engine (10) comprising a device (l; ll; lll; IV) according to any one of claims 7-14.
    [16]
    Motor vehicle (1) comprising a device (l; ll; lll; IV) according to any one of claims 7-14.
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    同族专利:
    公开号 | 公开日
    WO2014137269A1|2014-09-12|
    DE112014000860T5|2015-11-05|
    SE536981C2|2014-11-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102004048313A1|2004-10-05|2006-04-06|Robert Bosch Gmbh|Exhaust system for an internal combustion engine, and method for operating such an exhaust system|
    JP4214982B2|2004-10-12|2009-01-28|トヨタ自動車株式会社|Exhaust gas purification device for internal combustion engine|
    JP2006214311A|2005-02-02|2006-08-17|Mazda Motor Corp|Exhaust emission control device of internal combustion engine|
    RU2008108086A|2005-08-05|2009-09-10|Басф Каталистс Ллк |DIESEL EXHAUST SYSTEM PRODUCT AND CATALYTIC COMPOSITIONS FOR IT|
    US8444730B2|2010-09-27|2013-05-21|Ford Global Technologies, Llc|Even-loading DPF and regeneration thereof|
    JP2012219732A|2011-04-11|2012-11-12|Toyota Motor Corp|Pm filter and method of regenerating the same|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350261A|SE536981C2|2013-03-05|2013-03-05|Process and apparatus for exhaust gas purification in an internal combustion engine|SE1350261A| SE536981C2|2013-03-05|2013-03-05|Process and apparatus for exhaust gas purification in an internal combustion engine|
    PCT/SE2014/050227| WO2014137269A1|2013-03-05|2014-02-25|Method and arrangement for exhaust aftertreatment at a combustion engine|
    DE112014000860.5T| DE112014000860T5|2013-03-05|2014-02-25|Method and arrangement for exhaust aftertreatment in an internal combustion engine|
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