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    NOx sensor diagnostic for an exhaust aftertreatment system
    1.
    发明授权
    NOx sensor diagnostic for an exhaust aftertreatment system 有权

    公开(公告)号：US10156176B2

    公开(公告)日：2018-12-18

    申请号：US15708788

    申请日：2017-09-19

    申请人： Cummins, Inc.

    发明人： Andrew W. Osburn ,  Christopher Ferguson ,  Tony James Hall ,  Brian P. Liimatta

    IPC分类号： F01N3/00 ,  F01N11/00 ,  F01N3/20

    摘要： A method for diagnosing NOx sensors in an exhaust aftertreatment system includes suspending reductant dosing in an exhaust aftertreatment system; purging a reductant deposit in a selective catalytic reduction (SCR) system of the exhaust aftertreatment system; adjusting at least one of an ignition timing and an engine speed for an engine to adjust an engine out nitrogen oxide (NOx) amount; receiving measured SCR inlet NOx data from a SCR inlet NOx sensor and measured SCR outlet NOx data from a SCR outlet NOx sensor; determining a phase shift between the measured SCR inlet and SCR outlet NOx data; applying the determined phase shift to the SCR outlet NOx data; and determining a diagnostic feature based on the SCR inlet NOx data and the phase shifted SCR outlet NOx data regarding a state of the SCR inlet and outlet NOx sensors.

    NOx SENSOR DIAGNOSTIC FOR AN EXHAUST AFTERTREATMENT SYSTEM
    2.
    发明申请
    NOx SENSOR DIAGNOSTIC FOR AN EXHAUST AFTERTREATMENT SYSTEM 有权
    用于排气后处理系统的NOx传感器诊断

    公开(公告)号：US20160186630A1

    公开(公告)日：2016-06-30

    申请号：US14586174

    申请日：2014-12-30

    申请人： Cummins, Inc.

    发明人： Andrew W. Osburn ,  Christopher Ferguson ,  Tony James Hall ,  Brian P. Liimatta

    IPC分类号： F01N3/20 ,  F01N3/08 ,  F01N11/00

    CPC分类号： F01N11/00 ,  F01N3/2066 ,  F01N2550/02 ,  F01N2560/026 ,  F01N2560/14 ,  F01N2900/1402 ,  Y02T10/24 ,  Y02T10/47

    摘要： A method for diagnosing NOx sensors in an exhaust aftertreatment system includes suspending reductant dosing in an exhaust aftertreatment system; purging a reductant deposit in a selective catalytic reduction (SCR) system of the exhaust aftertreatment system; adjusting at least one of an ignition timing and an engine speed for an engine to adjust an engine out nitrogen oxide (NOx) amount; receiving measured SCR inlet NOx data from a SCR inlet NOx sensor and measured SCR outlet NOx data from a SCR outlet NOx sensor; determining a phase shift between the measured SCR inlet and SCR outlet NOx data; applying the determined phase shift to the SCR outlet NOx data; and determining a diagnostic feature based on the SCR inlet NOx data and the phase shifted SCR outlet NOx data regarding a state of the SCR inlet and outlet NOx sensors.

    摘要翻译： 用于诊断排气后处理系统中的NOx传感器的方法包括将还原剂剂量悬浮在排气后处理系统中; 在排气后处理系统的选择性催化还原（SCR）系统中清除还原剂沉积物; 调整发动机的点火正时和发动机转速中的至少一个以调节发动机的氮氧化物（NOx）量; 从SCR入口NOx传感器接收测量的SCR入口NOx数据，并从SCR出口NOx传感器测量SCR出口NOx数据; 确定测量的SCR入口和SCR出口NOx数据之间的相移; 将确定的相移施加到SCR出口NOx数据; 以及基于SCR入口NOx数据和关于SCR入口和出口NOx传感器的状态的相移SCR出口NOx数据来确定诊断特征。