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    • 9. 发明申请
    • Diagnosis Method for an Exhaust Gas Post-Treatment System
    • 废气后处理系统的诊断方法
    • US20080103684A1
    • 2008-05-01
    • US11792398
    • 2006-01-19
    • Ingo AllmerHolger HuelserArno Huss
    • Ingo AllmerHolger HuelserArno Huss
    • F01N11/00
    • F01N3/0235B01D53/9431B01D53/9495F01N3/023F01N3/2006F01N3/206F01N9/005F01N11/00F01N2260/14F01N2430/06F01N2430/08F01N2550/02F01N2560/026F01N2560/06F01N2570/14F01N2610/02F02B29/0406F02B37/00F02B37/22F02D41/0055F02D41/146F02D41/1463F02M26/05F02M26/23Y02A50/2344Y02T10/144Y02T10/47
    • The invention relates to a diagnosis method for an exhaust gas post-treatment system for the reduction of nitric oxides in the exhaust gas train of an internal combustion engine by means of selective catalytic reduction. The following steps are provided for easy recognition of errors: definition of at least one threshold value for the Nox concentration for at least one engine operation point; shifting the operational mode of the internal combustion engine into an operational state of diagnosis, wherein in the operational state of diagnosis substantially more Nox emissions are produced than in the normal operational mode; determining an amount of reducing agents corresponding to the increased amount of Nox emisions in the operational state of diagnosis; controlling a dosing device in order to introduce the amount of reducing agents, corresponding to the increased amount of NOx emissions during the operational state of diagnosis, into the wase gas; measuring the concentration of NOx downstream from the post-treatment device; comparing the measured concentration of NOx to the threshold value; taking a decision as to the erroneous or error-free operation of the waste gas post-treatment system based on comparison of the measured concentration of NOx to the threshold value; terminating the operational state of diagnosis.
    • 本发明涉及一种用于通过选择性催化还原来还原内燃机排气系列中的一氧化氮的废气后处理系统的诊断方法。 提供以下步骤用于容易地识别错误:为至少一个发动机操作点定义至少一个阈值,用于“否”浓度; 将内燃机的操作模式转换为诊断的操作状态,其中在诊断的操作状态下,与正常操作模式相比,不产生不产生排放物; 在诊断的操作状态中确定对应于增加的No <! - SIPO - >子块的量的还原剂量; 控制计量装置,以便将在诊断操作状态期间对应于增加的NO x X 2排放量的还原剂的量引入瓦斯气中; 测量后处理装置下游的NO x浓度; 将测量的NO 的浓度与阈值进行比较; 基于所测量的NO x的浓度与阈值的比较,对废气后处理系统的错误或无差错操作做出决定; 终止诊断的操作状态。