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    Exhaust gas treatment units for internal combustion engines and processes for operating them
    11.
    发明授权
    Exhaust gas treatment units for internal combustion engines and processes for operating them 有权
    用于内燃机的废气处理装置及其操作过程

    公开(公告)号：US06725647B2

    公开(公告)日：2004-04-27

    申请号：US10058685

    申请日：2002-01-28

    申请人： Marcus Pfeifer ,  Barry Van Setten ,  Jurgen Gieshoff ,  Paul Spurk ,  Egbert Lox ,  Thomas Kreuzer

    发明人： Marcus Pfeifer ,  Barry Van Setten ,  Jurgen Gieshoff ,  Paul Spurk ,  Egbert Lox ,  Thomas Kreuzer

    IPC分类号： F01N300

    CPC分类号： F01N3/0842 ,  B01D53/9418 ,  B01D53/944 ,  B01D53/945 ,  B01D53/9477 ,  B01D2255/1021 ,  B01D2255/911 ,  F01N3/0814 ,  F01N3/20 ,  F01N13/009 ,  F01N13/0097 ,  Y02T10/22 ,  Y02T10/24

    摘要： The present invention provides an exhaust gas treatment unit for an internal combustion engine. A first catalyst unit produces ammonia from corresponding constituents in a rich exhaust gas composition. A second catalyst unit that is located downstream of the first catalyst unit temporarily stores the ammonia produced by the first catalyst unit in the presence of a rich exhaust gas composition. In the presence of a lean exhaust gas composition, the nitrogen oxides present in the exhaust gas are subjected to a reduction reaction using the temporarily stored ammonia as reducing agent. The exhaust gas treatment unit also contains a third catalyst unit that is located between the other two catalyst units, and oxidizes the nitrogen oxides present in the exhaust gas at lean exhaust gas conditions to a such an extent that 25 to 75 vol. % of the nitrogen oxides entering the second catalyst unit consist of nitrogen dioxide.

    摘要翻译： 本发明提供一种用于内燃机的废气处理单元。 第一催化剂单元从富排气组合物中的相应组分产生氨。 位于第一催化剂单元下游的第二催化剂单元在富排气组合物的存在下临时存储由第一催化剂单元产生的氨。 在贫废气组合物的存在下，使用临时储存的氨作为还原剂对废气中存在的氮氧化物进行还原反应。 排气处理单元还含有位于其他两个催化剂单元之间的第三催化剂单元，并且将贫排气条件下的排气中存在的氮氧化物氧化至25〜75体积％ 进入第二催化剂单元的氮氧化物的％由二氧化氮组成。

    Process for checking the operability of an exhaust gas purification catalyst
    20.
    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。