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    Method for monitoring the nitrogen oxide storage capacity of a nitrogen oxide storage catalyst used in the form of a primary catalytic converter
    11.
    发明申请
    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
    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。

    Method for regeneration a nitrogen oxide storage catalyst
    12.
    发明申请
    Method for regeneration a nitrogen oxide storage catalyst 有权
    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。

    Method for Operating a Nitrogen Oxide Storage Catalytic Converter in a Motor Vechicle with Consideration of Regional Fuel Qualities
    13.
    发明申请
    Method for Operating a Nitrogen Oxide Storage Catalytic Converter in a Motor Vechicle with Consideration of Regional Fuel Qualities 审中-公开
    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。

    Method For Operating A Nitrogen Oxide Storage Catalyst In A Diesel Engine
    19.
    发明申请
    Method For Operating A Nitrogen Oxide Storage Catalyst In A Diesel Engine 有权
    在柴油发动机中操作氮氧化物储存催化剂的方法

    公开(公告)号：US20090297415A1

    公开(公告)日：2009-12-03

    申请号：US12090936

    申请日：2006-10-19

    申请人： Friedemann Rohr ,  Lutz Marc Ruwisch ,  Markus Koegel ,  Juliane Kluge ,  Ulrich Goebel

    发明人： Friedemann Rohr ,  Lutz Marc Ruwisch ,  Markus Koegel ,  Juliane Kluge ,  Ulrich Goebel

    IPC分类号： B01D53/86

    CPC分类号： F01N3/0871 ,  Y02T10/20

    摘要： A nitrogen oxide storage catalytic converter which is operated for a relatively long time at low exhaust-gas temperatures in the range between 120 and 250° C. exhibits a decreasing storage capacity as a result of incomplete regeneration at said temperatures. In order to re-establish the original storage capacity of the catalytic converter which is operated in this way, two-stage regeneration is proposed, wherein the storage catalytic converter is initially partially regenerated at the low exhaust gas temperature by means of a switch from the lean mode to the rich mode, and wherein subsequently, with rich exhaust gas again, the exhaust-gas temperature of the engine is raised into a range of between 300 and 400° C. for complete regeneration.

    摘要翻译： 在120-250℃的低废气温度下操作较长时间的氮氧化物储存催化转化器，由于在所述温度下的不完全再生，表现出降低的储存能力。 为了重新建立以这种方式运行的催化转化器的原始储存能力，提出了两级再生，其中储存催化转化器最初在低废气温度下部分地通过从 稀模式到富模式，并且随后再次具有浓排气，发动机的排气温度升高到300-400℃之间，以完全再生。