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1. 发明授权

US08230674B2 Method for monitoring the nitrogen oxide storage capacity of a nitrogen oxide storage catalyst used in the form of a primary catalytic converter 有权
标题翻译：监测以一级催化转化器形式使用的氮氧化物储存催化剂的氮氧化物储存能力的方法
公开(公告)号：US08230674B2
公开(公告)日：2012-07-31
申请号：US11722135
申请日：2005-12-17
申请人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
发明人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N3/00
CPC分类号： F01N11/00 , F01N3/0814 , F01N3/0842 , F01N3/0864 , F01N13/009 , F01N13/0093 , F01N2550/03 , Y02T10/47
摘要： Modern exhaust-gas purification systems in motor vehicles with a lean-burn engine include a starting catalyst fitted close to the engine and a main catalyst arranged in the underbody region, with both the starting catalyst and the main catalyst being formed by nitrogen oxide storage catalysts. The nitrogen oxide storage catalysts are in each case regenerated by the engine being briefly switched from lean-burn mode to rich-burn mode when the nitrogen oxide concentration in the exhaust gas downstream of the storage catalysts rises above a predetermined value.The starting catalyst is exposed to particularly high temperatures and is therefore prone to faster ageing of its nitrogen oxide storage capacity than the main catalyst. To check the nitrogen oxide storage capacity of the starting catalyst, a regeneration which is due for the catalyst system is selected in such a way in terms of its duration and the extent to which the exhaust gas is enriched that substantially only the starting catalyst is regenerated, whereas the main catalyst is not. In this arrangement, the criterion for terminating this partial regeneration is the breakthrough of rich exhaust gas through the starting catalyst. After the engine has been switched back to lean-burn mode, the time which elapses until the concentration of nitrogen oxides in the exhaust gas downstream of the catalyst requires regeneration again is measured. The measured time is a measure of the remaining nitrogen oxide storage capacity of the starting catalyst.
摘要翻译：具有稀燃燃烧发动机的机动车辆中的现代废气净化系统包括安装在发动机附近的起动催化剂和布置在底体区域中的主催化剂，起始催化剂和主催化剂由氮氧化物储存催化剂形成。当存储催化剂下游的废气中的氮氧化物浓度升高到预定值以上时，氮氧化物储存催化剂在每种情况下都可通过发动机从稀燃模式短暂切换为富燃模式。起始催化剂暴露于特别高的温度，因此比主催化剂容易发生氮氧化物储存容量的老化。为了检查起始催化剂的氮氧化物存储容量，选择催化剂体系所致的再生，就其持续时间和废气浓缩程度而言，基本上只有起始催化剂被再生，而主催化剂不是。在这种布置中，终止这种部分再生的标准是通过起动催化剂的富排气的突破。在发动机已经切换回稀燃模式之后，测量在催化剂下游的废气中的氮氧化物浓度再次需要再次之前经过的时间。测量时间是起始催化剂的剩余氮氧化物储存容量的量度。

2. 发明授权

US07905087B2 Method for regenerating nitrogen oxide storage catalysts 有权
标题翻译：氮氧化物储存催化剂再生方法
公开(公告)号：US07905087B2
公开(公告)日：2011-03-15
申请号：US11995765
申请日：2006-06-22
申请人： Ulrich Goebel , Stephan Bremm , Christian Manfred Tomanik , Wilfried Mueller , Thomas Kreuzer
发明人： Ulrich Goebel , Stephan Bremm , Christian Manfred Tomanik , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N3/00
CPC分类号： B01D53/9495 , B01D53/9431 , B01D53/96 , F01N3/0807 , F01N3/22 , F01N3/32 , Y02T10/20
摘要： Nitrogen oxide storage catalytic converters for purifying the exhaust gas of lean-burn engines are periodically regenerated by switching the engine from lean-burn mode to rich-burn mode. After regeneration has taken place, the engine is switched back to lean-burn mode. At this time, rich exhaust gas is still flowing in the exhaust line from the engine to the catalytic converter, which rich exhaust gas is ejected via the catalytic converter into the environment by the following, lean exhaust gas. This leads to brief emissions peaks of the rich exhaust gas constituents and impairs the level of exhaust gas cleaning which can be obtained. In order to solve said problem, it is proposed to create oxidizing conditions by injecting air upstream of the storage catalytic converter, so that the rich exhaust gas constituents still flowing in the exhaust line upstream of the storage catalytic converter can be converted at the storage catalytic converter to form non-harmful products. The proposed method can lead to a considerable improvement in exhaust gas purification in particular in the case of catalytic converters which are already impaired in terms of their storage capacity through aging, and which must be regenerated significantly more frequently than fresh catalytic converters.
摘要翻译：通过将发动机从稀燃模式切换到富燃烧模式，周期性地再生用于净化贫燃发动机废气的氧化氮储存催化转化器。发生再生后，发动机切换回稀燃模式。此时，排气管道中的废气仍然从发动机流向催化转化器，其中，废气通过下列稀释废气通过催化转化器排放到环境中。这导致了丰富的废气成分的短暂的排放峰值，并损害了可以获得的废气净化水平。为了解决上述问题，提出了通过在储存催化转化器的上游喷射空气来产生氧化条件，使得能够在储存催化转化器的上游排出的排气管中仍然流动的富排气成分在储存催化剂转换器形成无害产品。所提出的方法可以导致废气净化的显着改进，特别是在催化转化器的情况下，其通过老化而在储存容量方面已经受损，并且必须比新鲜催化转化器显着更频繁地再生。

3. 发明授权

US07832201B2 Method for regeneration a nitrogen oxide storage catalyst 有权
标题翻译：再生氮氧化物储存催化剂的方法
公开(公告)号：US07832201B2
公开(公告)日：2010-11-16
申请号：US11722149
申请日：2005-12-24
申请人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
发明人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N3/00
CPC分类号： F02D41/0275 , B01D53/9495 , B01D53/96 , F01N3/0814 , F01N3/0885
摘要： To remove the nitrogen oxides from the exhaust gas from lean-burn engines, these engines are equipped with a nitrogen oxide storage catalyst, which has to be regenerated frequently by the engine being briefly switched to rich-burn mode. The regeneration is usually initiated when the nitrogen oxide concentration downstream of the catalyst rises above a permissible value. In this context, there is a risk of the bed temperature of the catalyst during and after regeneration being pushed into a range with incipient thermal desorption of the nitrogen oxides on account of the heat which is released during the conversion of the nitrogen oxides by the reducing constituents of the exhaust gas. This can lead to increased nitrogen oxide emission both during the regeneration itself and after the engine has been switched back to lean-burn mode. To eliminate this problem, it is proposed to divide the rich-burn mode into two rich pulses which follow one another in time, the first rich pulse being of shorter duration than the second rich pulse.
摘要翻译：为了从贫燃发动机的排气中除去氮氧化物，这些发动机配备有氮氧化物储存催化剂，其必须经过发动机的短时间切换为富燃烧模式而频繁地再生。当催化剂下游的氮氧化物浓度高于允许值时，通常开始再生。在这种情况下，存在在再生期间和之后将催化剂的床温度推到具有氮氧化物的初期热解吸的范围内的风险，这是由于在氮氧化物转化期间释放的热量通过还原排气成分。这可以导致在再生期间和发动机已经切换回稀燃模式之后氮氧化物排放增加。为了消除这个问题，提出将富燃烧模式分成时间上相互依赖的两个富脉冲，第一富脉冲的持续时间比第二富脉冲短。

4. 发明申请

US20090145112A1 Method for Regenerating Nitrogen Oxide Storage Catalysts 有权
标题翻译：再生氮氧化物储存催化剂的方法
公开(公告)号：US20090145112A1
公开(公告)日：2009-06-11
申请号：US11995765
申请日：2006-06-22
申请人： Ulrich Goebel , Stephan Bremm , Christian Manfred Tomanik , Wilfried Mueller , Thomas Kreuzer
发明人： Ulrich Goebel , Stephan Bremm , Christian Manfred Tomanik , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N9/00
CPC分类号： B01D53/9495 , B01D53/9431 , B01D53/96 , F01N3/0807 , F01N3/22 , F01N3/32 , Y02T10/20
摘要： Nitrogen oxide storage catalytic converters for purifying the exhaust gas of lean-burn engines are periodically regenerated by switching the engine from lean-burn mode to rich-burn mode. After regeneration has taken place, the engine is switched back to lean-burn mode. At this time, rich exhaust gas is still flowing in the exhaust line from the engine to the catalytic converter, which rich exhaust gas is ejected via the catalytic converter into the environment by the following, lean exhaust gas. This leads to brief emissions peaks of the rich exhaust gas constituents and impairs the level of exhaust gas cleaning which can be obtained. In order to solve said problem, it is proposed to create oxidizing conditions by injecting air upstream of the storage catalytic converter, so that the rich exhaust gas constituents still flowing in the exhaust line upstream of the storage catalytic converter can be converted at the storage catalytic converter to form non-harmful products. The proposed method can lead to a considerable improvement in exhaust gas purification in particular in the case of catalytic converters which are already impaired in terms of their storage capacity through aging, and which must be regenerated significantly more frequently than fresh catalytic converters.
摘要翻译：通过将发动机从稀燃模式切换到富燃烧模式，周期性地再生用于净化贫燃发动机废气的氧化氮储存催化转化器。发生再生后，发动机转回稀燃模式。此时，排气管道中的废气仍然从发动机流向催化转化器，其中，废气通过下列稀释废气通过催化转化器排放到环境中。这导致了丰富的废气成分的短暂的排放峰值，并损害了可以获得的废气净化水平。为了解决上述问题，提出了通过在储存催化转化器的上游喷射空气来产生氧化条件，使得能够在储存催化转化器的上游排出的排气管中仍然流动的富排气成分在储存催化剂转换器形成无害产品。所提出的方法可以导致废气净化的显着改进，特别是在催化转化器的情况下，其通过老化而在储存容量方面已经受损，并且必须比新鲜催化转化器显着更频繁地再生。

5. 发明申请

US20090229249A1 Method for monitoring the nitrogen oxide storage capacity of a nitrogen oxide storage catalyst used in the form of a primary catalytic converter 有权
标题翻译：监测以一级催化转化器形式使用的氮氧化物储存催化剂的氮氧化物储存能力的方法
公开(公告)号：US20090229249A1
公开(公告)日：2009-09-17
申请号：US11722135
申请日：2005-12-17
申请人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
发明人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N11/00 , G01M15/10
CPC分类号： F01N11/00 , F01N3/0814 , F01N3/0842 , F01N3/0864 , F01N13/009 , F01N13/0093 , F01N2550/03 , Y02T10/47
摘要： Modern exhaust-gas purification systems in motor vehicles with a lean-burn engine include a starting catalyst fitted close to the engine and a main catalyst arranged in the underbody region, with both the starting catalyst and the main catalyst being formed by nitrogen oxide storage catalysts. The nitrogen oxide storage catalysts are in each case regenerated by the engine being briefly switched from lean-burn mode to rich-burn mode when the nitrogen oxide concentration in the exhaust gas downstream of the storage catalysts rises above a predetermined value.The starting catalyst is exposed to particularly high temperatures and is therefore prone to faster ageing of its nitrogen oxide storage capacity than the main catalyst. To check the nitrogen oxide storage capacity of the starting catalyst, a regeneration which is due for the catalyst system is selected in such a way in terms of its duration and the extent to which the exhaust gas is enriched that substantially only the starting catalyst is regenerated, whereas the main catalyst is not. In this arrangement, the criterion for terminating this partial regeneration is the breakthrough of rich exhaust gas through the starting catalyst. After the engine has been switched back to lean-burn mode, the time which elapses until the concentration of nitrogen oxides in the exhaust gas downstream of the catalyst requires regeneration again is measured. The measured time is a measure of the remaining nitrogen oxide storage capacity of the starting catalyst.
摘要翻译：具有稀燃燃烧发动机的机动车辆中的现代废气净化系统包括安装在发动机附近的起动催化剂和布置在底体区域中的主催化剂，起始催化剂和主催化剂由氮氧化物储存催化剂形成。当存储催化剂下游的废气中的氮氧化物浓度升高到预定值以上时，氮氧化物储存催化剂在每种情况下都可通过发动机从稀燃模式短暂切换为富燃模式。起始催化剂暴露于特别高的温度，因此比主催化剂容易发生氮氧化物储存容量的老化。为了检查起始催化剂的氮氧化物存储容量，选择催化剂体系所致的再生，就其持续时间和废气浓缩程度而言，基本上只有起始催化剂被再生，而主催化剂不是。在这种布置中，终止这种部分再生的标准是通过起动催化剂的富排气的突破。在发动机已经切换回稀燃模式之后，测量在催化剂下游的废气中的氮氧化物浓度再次需要再次之前经过的时间。测量时间是起始催化剂的剩余氮氧化物储存容量的量度。

6. 发明申请

US20090151329A1 Method for regeneration a nitrogen oxide storage catalyst 有权
标题翻译：再生氮氧化物储存催化剂的方法
公开(公告)号：US20090151329A1
公开(公告)日：2009-06-18
申请号：US11722149
申请日：2005-12-24
申请人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
发明人： Stephan Bremm , Christian Manfred Tomanik , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N9/00
CPC分类号： F02D41/0275 , B01D53/9495 , B01D53/96 , F01N3/0814 , F01N3/0885
摘要： To remove the nitrogen oxides from the exhaust gas from lean-burn engines, these engines are equipped with a nitrogen oxide storage catalyst, which has to be regenerated frequently by the engine being briefly switched to rich-burn mode. The regeneration is usually initiated when the nitrogen oxide concentration downstream of the catalyst rises above a permissible value. In this context, there is a risk of the bed temperature of the catalyst during and after regeneration being pushed into a range with incipient thermal desorption of the nitrogen oxides on account of the heat which is released during the conversion of the nitrogen oxides by the reducing constituents of the exhaust gas. This can lead to increased nitrogen oxide emission both during the regeneration itself and after the engine has been switched back to lean-burn mode. To eliminate this problem, it is proposed to divide the rich-burn mode into two rich pulses which follow one another in time, the first rich pulse being of shorter duration than the second rich pulse.
摘要翻译：为了从贫燃发动机的排气中除去氮氧化物，这些发动机配备有氮氧化物储存催化剂，其必须经过发动机的短时间切换为富燃烧模式而频繁地再生。当催化剂下游的氮氧化物浓度高于允许值时，通常开始再生。在这种情况下，存在在再生期间和之后将催化剂的床温度推到具有氮氧化物的初期热解吸的范围内的风险，这是由于在氮氧化物转化期间释放的热量通过还原排气成分。这可以导致在再生期间和发动机已经切换回稀燃模式之后氮氧化物排放增加。为了消除这个问题，提出将富燃烧模式分成时间上相互依赖的两个富脉冲，第一富脉冲的持续时间比第二富脉冲短。

7. 发明申请

US20110258982A1 METHOD FOR THE ON-BOARD REACTIVATION OF THERMALLY AGED NITROGEN OXIDE STORAGE CATALYSTS IN MOTOR VEHICLES HAVING AN INTERNAL COMBUSTION ENGINE OPERATED PREDOMINANTLY UNDER LEAN CONDITIONS 审中-公开
标题翻译：在具有内部燃烧发动机的电动车辆中，根据LEAN条件预先运行的热老化的氮氧化物储存催化剂的板反应方法
公开(公告)号：US20110258982A1
公开(公告)日：2011-10-27
申请号：US12304843
申请日：2007-06-05
申请人： Stephan Eckhoff , Meike Wittrock , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
发明人： Stephan Eckhoff , Meike Wittrock , Ulrich Goebel , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N3/18
CPC分类号： F01N3/0885 , F01N3/0814 , F01N3/0842 , F01N3/101 , F01N3/103 , F01N13/009 , F01N13/011 , F01N13/107 , F01N2250/12 , F01N2260/04 , F01N2330/06 , F01N2430/06 , Y02A50/2324 , Y02T10/22
摘要： Nitrogen oxide storage catalysts are used to remove the nitrogen oxides present in the lean exhaust gas of lean-burn engines. Storage catalysts are thermally aged by high temperatures. Ageing is due to sintering of the catalytically active noble metal components of the catalyst and to formation of compounds of the storage components with the support materials. According to the invention, the formation of compounds of the storage materials can be largely reversed by treatment of the storage material with a gas mixture containing carbon dioxide, optionally water vapor and optionally nitrogen oxides at temperatures in the range from 200° C. to 950° C., preferably from 300° C. to 700° C. The reactivation can be carried out under emission-neutral conditions directly in the vehicle during driving operation by setting of suitable exhaust gas conditions and regulating the air/fuel ratio.
摘要翻译：氮氧化物储存催化剂用于去除贫燃发动机的贫废气中存在的氮氧化物。储存催化剂通过高温热老化。老化是由于催化剂的催化活性贵金属组分的烧结以及用载体材料形成储存组分的化合物。根据本发明，存储材料的化合物的形成可以通过用包含二氧化碳，任选的水蒸汽和任选的氮氧化物的气体混合物在200℃至950℃的温度范围内处理储存材料而大大逆转 ℃，优选为300℃至700℃。通过设定合适的废气条件并调节空气/燃料比，可以在驾驶操作期间直接在车辆的发射 - 中性条件下进行再活化。

8. 发明申请

US20080314030A1 Method for Operating a Nitrogen Oxide Storage Catalytic Converter in a Motor Vechicle with Consideration of Regional Fuel Qualities 审中-公开
标题翻译：在考虑区域燃料质量的汽车机器中操作氮氧化物储存催化转化器的方法
公开(公告)号：US20080314030A1
公开(公告)日：2008-12-25
申请号：US12158099
申请日：2006-11-22
申请人： Wilfried Mueller , Thomas Kreuzer , Ulrich Goebel , Friedemann Rohr
发明人： Wilfried Mueller , Thomas Kreuzer , Ulrich Goebel , Friedemann Rohr
IPC分类号： F01N9/00
CPC分类号： F02D41/0275 , F01N3/0814 , F01N3/0842 , F01N3/0885 , F01N9/00 , F01N11/00 , F02D41/0025 , F02D41/3076 , F02D2200/701 , Y02T10/47
摘要： The fuel qualities for vehicles differ, for example, in Europe on a regional basis. This applies in particular to the sulphur content of the fuel. If vehicles with modern lean engines or with diesel engines which are equipped with nitrogen oxide storage-type catalytic converters in order to reduce the nitrogen oxide content in their exhaust gas pass through regions with a sulphur content in the fuel which is above the sulphur content which is specified for the vehicle, the engine controller will correspondingly frequently initiate desulphurization of the storage-type catalytic converter after the vehicle has been refuelled with this fuel. Any desulphurization entails an increased level of fuel consumption and greater ageing of the catalytic converter. It is proposed to avoid these adverse effects in that in lean motors the engine controller switches to stoichiometric operation in such a case, and in a diesel engine said engine controller prevents the desulphurization. The information about the region in which the vehicle is moving at a particular time can be transmitted to the engine controller by a navigation system.
摘要翻译：车辆的燃料质量在欧洲区域不同。这尤其适用于燃料的硫含量。如果配备有氮氧化物存储型催化转化器以减少其废气中的氮氧化物含量的现代精益发动机或柴油发动机的车辆通过燃料中硫含量高于硫含量的区域为车辆指定，发动机控制器将相应地频繁地启动储存型催化转化器在车辆加油之后的脱硫。任何脱硫都需要增加燃料消耗水平和催化转化器的老化。建议避免在这种情况下，在稀薄电动机中，发动机控制器切换到化学计量操作的这些不利影响，并且在柴油发动机中，所述发动机控制器防止脱硫。关于车辆在特定时间移动的区域的信息可以由导航系统发送到发动机控制器。

9. 发明授权

US08383544B2 Dual-stage method for the reactivation of thermally aged nitrogen oxide storage catalysts 有权
标题翻译：热老化氮氧化物储存催化剂再活化的双阶段方法
公开(公告)号：US08383544B2
公开(公告)日：2013-02-26
申请号：US12599411
申请日：2008-04-16
申请人： Stephan Eckhoff , Meike Wittrock , Ulrich Goebel , Ina Grisstede , Ruediger Hoyer , Wilfried Mueller , Thomas Kreuzer , Maria Cristina Casapu , Jan-Dierk Grunwaldt , Marek Maciejewski , Aflons Baiker
发明人： Stephan Eckhoff , Meike Wittrock , Ulrich Goebel , Ina Grisstede , Ruediger Hoyer , Wilfried Mueller , Thomas Kreuzer , Maria Cristina Casapu , Jan-Dierk Grunwaldt , Marek Maciejewski , Aflons Baiker
IPC分类号： B01J23/58
CPC分类号： B01J35/002 , B01D53/9422 , B01D53/96 , B01D2255/2042 , B01D2255/2065 , B01J23/002 , B01J23/63 , B01J23/96 , B01J38/04 , B01J38/06 , B01J38/08 , B01J2523/00 , B01J2523/25 , B01J2523/3712 , B01J2523/828
摘要： Nitrogen oxide storage catalysts are used to remove the nitrogen oxides present in the lean exhaust gas of lean-burn engines. As a result of the stress due to high temperatures in vehicle operation, they are subject to thermal aging processes which affect both the nitrogen oxide storage components and the noble metals present as catalytically active components. The present invention provides a process with which the catalytic activity of a nitrogen oxide storage catalyst which comprises, in addition to platinum as a catalytically active component, basic compounds of strontium and/or barium on a support material comprising cerium oxide, said catalytic activity being lost owing to the thermal aging process, can be at least partly restored. The two-stage process is based on the fact that strontium and/or barium compounds formed during the thermal aging with the support material, which also comprise platinum, are recycled to the catalytically active forms by controlled treatment with specific gas mixtures.
摘要翻译：氮氧化物储存催化剂用于去除贫燃发动机的贫废气中存在的氮氧化物。由于车辆操作中的高温引起的应力的结果，它们受到影响作为催化活性组分存在的氮氧化物存储组分和贵金属两者的热老化过程。本发明提供了一种氮氧化物储存催化剂的催化活性的方法，除了铂作为催化活性组分之外，还包括锶和/或钡的碱性化合物在包含氧化铈的载体材料上，所述催化活性为由于热老化过程而损失，可以至少部分恢复。两阶段工艺是基于以下事实：在热老化期间形成的锶和/或钡化合物与支撑材料（其也包含铂）通过用特定气体混合物的控制处理再循环至催化活性形式。

10. 发明申请

US20100037597A1 EXHAUST EMISSION CONTROL SYSTEM FOR LEAN ENGINES AND METHOD FOR OPERATING THE SYSTEM 审中-公开
标题翻译：排气发动机排气控制系统及运行系统的方法
公开(公告)号：US20100037597A1
公开(公告)日：2010-02-18
申请号：US12519989
申请日：2007-12-21
申请人： Stephan Eckhoff , Ulrich Goebel , Susanne Philipp , Wilfried Mueller , Thomas Kreuzer
发明人： Stephan Eckhoff , Ulrich Goebel , Susanne Philipp , Wilfried Mueller , Thomas Kreuzer
IPC分类号： F01N9/00 , F01N3/023 , F01N3/10
CPC分类号： F01N3/0814 , F01N3/0842 , F01N3/0871 , F01N3/2073 , F01N13/009 , F01N13/0097 , F01N13/011 , F01N2570/18 , F01N2610/03 , F02D41/0082 , F02D41/0275 , Y02T10/24
摘要： An emission control system for the cleaning of the exhaust gases of a lean burn engine with two or more cylinders comprises a first exhaust leg for the exhaust gases of a first group of cylinders and a second exhaust leg for the exhaust gases of a second group of cylinders. A nitrogen oxide storage catalyst is arranged in each exhaust leg. The two exhaust legs are combined downstream of the storage catalysts at a confluence to form a common exhaust leg. The common exhaust leg contains an SCR catalyst. The first and second groups of cylinders are each supplied alternately in periodic intervals with lean and rich air/fuel mixtures. Lean or rich exhaust gases are thus obtained in the combustion in the cylinders and released into the corresponding exhaust legs. Lean and rich exhaust gases are adjusted with respect to one another so as to result in a lean exhaust gas after the combination of the exhaust gases in the common exhaust leg. The regeneration of the storage catalysts may result in the formation of ammonia, which is stored by the SCR catalyst and reacted with nitrogen oxides which pass through the storage catalysts in an unwanted manner during the storage phases.
摘要翻译：用于清洁具有两个或多个气缸的稀薄燃烧发动机的废气的排放控制系统包括用于第一组气缸的排气的第一排气支管和用于第二组气缸的废气的第二排气支管气瓶。在每个排气支管中设置氮氧化物储存催化剂。两个排气支路在汇合处在储存催化剂的下游组合以形成共同的排气支路。普通排气支架含有SCR催化剂。第一组和第二组汽缸分别以稀薄和浓缩的空气/燃料混合物以周期性间隔交替供应。因此，在气缸中的燃烧中获得精益或浓缩的废气，并将其排放到相应的排气支管中。精益和丰富的废气相对于彼此进行调节，以便在共同排气支路中排出的废气组合之后产生贫乏的废气。储存催化剂的再生可导致氨的形成，其由SCR催化剂储存并与在储存阶段期间以不期望的方式通过储存催化剂的氮氧化物反应。

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