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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
    41.
    发明授权
    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：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。

    Method for regenerating nitrogen oxide storage catalysts
    42.
    发明授权
    Method for regenerating nitrogen oxide storage catalysts 有权
    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。

    Process for checking the operability of an exhaust gas purification catalyst
    49.
    发明授权
    Process for checking the operability of an exhaust gas purification catalyst 有权
    用于检查废气净化催化剂的可操作性的方法

    公开(公告)号：US06739176B2

    公开(公告)日：2004-05-25

    申请号：US09809355

    申请日：2001-03-16

    申请人： Ulrich Neuhausen ,  Harald Klein ,  Egbert Lox ,  Jürgen Gieshoff ,  Thomas Kreuzer

    发明人： Ulrich Neuhausen ,  Harald Klein ,  Egbert Lox ,  Jürgen Gieshoff ,  Thomas Kreuzer

    IPC分类号： G01M1500

    CPC分类号： F01N11/002 ,  F01N11/00 ,  F01N11/005 ,  F01N2550/02 ,  F02B3/06 ,  Y02T10/47

    摘要： A process for checking the operability of an exhaust gas purification catalyst for diesel engines, which has a light-off temperature and a degree of conversion rCO for carbon monoxide (CO), by direct measurement of the carbon monoxide concentration in combination with a temperature measurement. To evaluate the remaining catalytic activity of the catalyst the difference &Dgr;T between the current catalyst exit temperature TE of the exhaust gas and the light-off temperature TCO,50%,fresh of the fresh catalyst for carbon monoxide stored as a function of the speed and load &Dgr;T=TE−TCO,50%,fresh is determined and the degree of conversion rCO for carbon monoxide is ascertained.

    摘要翻译： 通过一氧化碳浓度的直接测量与温度测量结合来检查具有一氧化碳（CO）的起燃温度和转化度rCO的用于柴油机的排气净化催化剂的可操作性的方法 。 为了评估催化剂的剩余催化活性，废气的当前催化剂出口温度TE与起燃温度TCO之间的差值ΔTT为50％，一氧化碳新鲜催化剂的新鲜作为速度存储， 确定负载，并确定一氧化碳的转化程度rCO。

    Process for regenerating the catalytic activity of a catalyst that is located in the exhaust gas line of a diesel engine and that has at least one oxidizing function
    50.
    发明授权
    Process for regenerating the catalytic activity of a catalyst that is located in the exhaust gas line of a diesel engine and that has at least one oxidizing function 有权
    再生催化剂的催化活性的方法，所述催化剂位于柴油发动机的排气管线中并具有至少一种氧化功能

    公开(公告)号：US06691509B2

    公开(公告)日：2004-02-17

    申请号：US10056813

    申请日：2002-01-24

    申请人： Michael Hoffman ,  Harald Klein ,  Thomas Kreuzer

    发明人： Michael Hoffman ,  Harald Klein ,  Thomas Kreuzer

    IPC分类号： F01N300

    CPC分类号： F02D41/024 ,  F02B3/06 ,  F02D41/027 ,  F02D41/1446 ,  F02D41/405 ,  Y02T10/26 ,  Y02T10/44

    摘要： The present invention provides a process for regenerating the catalytic activity of catalysts that have oxidizing functions. A catalyst that is located in the exhaust gas line of a diesel engine that preferably contains a catalytically active coating on a honeycomb carrier that does not have a filter function and that has at least one oxidizing function is regenerated. As a result of time-restricted increases in the exhaust gas temperature upstream of the catalyst to a value greater than 450° C., the combustion of soot particles and hydrocarbons deposited on the catalyst is initiated, and thus, the catalytic activity of the catalyst is at least partly regenerated.

    摘要翻译： 本发明提供了具有氧化功能的催化剂的催化活性再生方法。 催化剂位于柴油发动机的排气管线中，优选在蜂窝状载体上含有不具有过滤功能并具有至少一种氧化功能的催化活性涂层。 作为催化剂上游排气温度上升到大于450℃的时间限制的结果，引发了沉积在催化剂上的烟灰颗粒和烃的燃烧，因此催化剂的催化活性 至少部分再生。