DIAGNOSTIC DEVICE
    46.
    发明公开
    DIAGNOSTIC DEVICE 有权
    诊断设备

    公开(公告)号:EP3048276A1

    公开(公告)日:2016-07-27

    申请号:EP14846463.9

    申请日:2014-09-18

    Abstract: The present invention relates to a diagnostic device which performs highly accurate diagnosis of the deterioration of a DOC. The diagnostic device includes: a DOC (15) for oxidizing HC and NO in an exhaust gas; an SCR catalyst (22) for reducing and purifying NOx contained in the exhaust gas; a NOx purification rate calculation unit (41) which calculates, based on NOx values at upstream and downstream sides of the SCR catalyst (22), a low temperature NOx purification rate and a high temperature NOx purification rate; a HC heat generation rate calculation unit (42) which calculates an HC purification rate based on at least the difference between the exhaust gas heat quantities at upstream and downstream sides of the DOC (15); and a deterioration determination unit (45) which determines the deterioration in the NO 2 producing capability of the DOC (15) based on the calculated low temperature NOx purification rate, the calculated high temperature NOx purification rate, and the calculated HC purification rate.

    Abstract translation: 诊断装置技术领域本发明涉及对DOC的恶化进行高精度诊断的诊断装置。 诊断装置包括:用于氧化排气中的HC和NO的DOC(15) SCR催化剂(22),其用于还原和净化排气中所含的NOx; 基于所述SCR催化剂(22)的上游侧和下游侧的NO X值,计算低温NO X净化率和高温NO X净化率的NO X净化率计算部(41) 至少基于所述DOC(15)的上游侧和下游侧的废气热量之间的差异来计算HC净化率的HC生热率计算单元(42); 以及劣化判定部(45),基于计算出的低温NO X净化率,计算出的高温NO X净化率和计算出的HC净化率,判定DOC(15)的NO 2生成能力的恶化。

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