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    Method for on-board diagnostics of diesel engine NOx adsorber catalysts
    1.
    发明授权
    Method for on-board diagnostics of diesel engine NOx adsorber catalysts 有权
    柴油机NOx吸附剂催化剂的车载诊断方法

    公开(公告)号：US07628063B2

    公开(公告)日：2009-12-08

    申请号：US12008323

    申请日：2008-01-10

    申请人： Aleksey Yezerets ,  Sriram S. Popuri ,  Neal W. Currier ,  William Shelbourne Epling ,  Paul James Millington ,  David Scott Lafyatis

    发明人： Aleksey Yezerets ,  Sriram S. Popuri ,  Neal W. Currier ,  William Shelbourne Epling ,  Paul James Millington ,  David Scott Lafyatis

    IPC分类号： G01M15/10

    CPC分类号： F01N11/007 ,  F01N3/0871 ,  F01N2560/025 ,  Y02T10/20 ,  Y02T10/47

    摘要： An OBD system that diagnoses on board the condition of NOx adsorber catalysts in diesel engines and that relies on existing mass-produced exhaust gas oxygen sensor, also known as lambda sensor, technology, and the following established phenomena. In a reducing environment, typical exhaust gas oxygen (lambda) sensors have different sensitivities to various reductants, with sensitivity decreasing in this order: H2>CO>short-chain hydrocarbons>long-chain hydrocarbons. In the process of regeneration of the NOx adsorber catalyst, the original reductant may evolve into a different reductant species, e.g., via reactions such as a water-gas shift (WGS), a reforming, a partial oxidation, etc. This leads to a difference in exhaust gas oxygen sensor readings between the inlet to the catalyst and outlet from the catalyst. It has been observed in diesel engine testing that the ability of the NOx adsorber catalyst to perform such a reductant evolution is correlative to the catalyst's NOx reduction capability.

    摘要翻译： 一种OBD系统，用于诊断柴油发动机中NOx吸附剂催化剂的情况，并且依赖于现有的大量生产的废气氧传感器，也称为λ传感器，技术和以下已建立的现象。 在还原环境中，典型的废气氧（λ）传感器对各种还原剂具有不同的灵敏度，灵敏度依次降低：H2> CO>短链烃>长链烃。 在NO x吸附剂催化剂的再生过程中，原来的还原剂可以演化成不同的还原剂物质，例如通过反应如水煤气变换（WGS），重整，部分氧化等。这导致了 催化剂入口与催化剂出口之间的排气氧传感器读数差异。 在柴油机测试中已经观察到，NOx吸附剂催化剂进行这种还原剂演变的能力与催化剂的NOx还原能力相关。

    Method for on-board diagnostics of diesel engine NOx adsorber catalysts
    2.
    发明申请
    Method for on-board diagnostics of diesel engine NOx adsorber catalysts 有权
    柴油机NOx吸附剂催化剂的车载诊断方法

    公开(公告)号：US20080168824A1

    公开(公告)日：2008-07-17

    申请号：US12008323

    申请日：2008-01-10

    申请人： Aleksey Yezerets ,  Sriram S. Popuri ,  Neal W. Currier ,  William Shelbourne Epling ,  Paul James Millington ,  David Scott Lafyatis

    发明人： Aleksey Yezerets ,  Sriram S. Popuri ,  Neal W. Currier ,  William Shelbourne Epling ,  Paul James Millington ,  David Scott Lafyatis

    IPC分类号： G01M15/04 ,  F01N9/00 ,  F01N11/00

    CPC分类号： F01N11/007 ,  F01N3/0871 ,  F01N2560/025 ,  Y02T10/20 ,  Y02T10/47

    摘要： An OBD system that diagnoses on board the condition of NOx adsorber catalysts in diesel engines and that relies on existing mass-produced exhaust gas oxygen sensor, also known as lambda sensor, technology, and the following established phenomena. In a reducing environment, typical exhaust gas oxygen (lambda) sensors have different sensitivities to various reductants, with sensitivity decreasing in this order: H2>CO>short-chain hydrocarbons>long-chain hydrocarbons. In the process of regeneration of the NOx adsorber catalyst, the original reductant may evolve into a different reductant species, e.g., via reactions such as a water-gas shift (WGS), a reforming, a partial oxidation, etc. This leads to a difference in exhaust gas oxygen sensor readings between the inlet to the catalyst and outlet from the catalyst. It has been observed in diesel engine testing that the ability of the NOx adsorber catalyst to perform such a reductant evolution is correlative to the catalyst's NOx reduction capability.

    摘要翻译： 一种OBD系统，用于诊断柴油发动机中NOx吸附剂催化剂的情况，并且依赖于现有的大量生产的废气氧传感器，也称为λ传感器，技术和以下建立的现象。 在还原环境中，典型的废气氧（λ）传感器对各种还原剂具有不同的灵敏度，灵敏度依次降低：H 2短链烃>长链烃。 在NO x吸附剂催化剂的再生过程中，原来的还原剂可以演化成不同的还原剂物质，例如通过反应如水煤气变换（WGS），重整，部分氧化等。这导致了 催化剂入口与催化剂出口之间的排气氧传感器读数差异。 在柴油机测试中已经观察到，NOx吸附剂催化剂进行这种还原剂演变的能力与催化剂的NOx还原能力相关。