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    • 2. 发明申请
    • Procedure to diagnose an exhaust gas treatment device and device to implement the procedure
    • 废气处理装置及装置的诊断步骤
    • US20070234709A1
    • 2007-10-11
    • US11712882
    • 2007-03-01
    • Carsten Bork
    • Carsten Bork
    • F01N3/00
    • F01N11/00Y02T10/47
    • A procedure for the pressure diagnosis in a reagent substance metering system, which introduces a reagent substance into an exhaust gas area of an internal combustion engine upstream in front of at least one exhaust treatment device as well as a device to implement the procedure is proposed. The reagent substance pressure occurring between a metering valve and a security valve disposed downstream after the metering valve is measured during different operating conditions of the metering valve and/or the security valve and is compared with at least one threshold value. An error signal is provided when the threshold is exceeded. The procedural approach according to the invention allows for a leakage diagnosis of the reagent substance metering system. Furthermore, the procedural approach according to the invention allows for a diagnosis of metering valve and/or the security valve and/or the check valve. The procedural approach according to the invention contributes overall to the elevation of the security, especially if the reagent substance is combustible.
    • 提出了在至少一个排气处理装置的前方向内燃机的排气区域引入试剂物质的试剂物质计量系统的压力诊断步骤以及实施该方法的装置。 在计量阀和位于计量阀后面的安全阀之间发生的试剂物质压力在计量阀和/或安全阀的不同操作条件期间被测量并且与至少一个阈值进行比较。 当超过阈值时,提供错误信号。 根据本发明的程序方法允许试剂物质计量系统的泄漏诊断。 此外,根据本发明的程序方法允许诊断计量阀和/或安全阀和/或止回阀。 根据本发明的程序方法总体上提高了安全性,特别是如果试剂物质是可燃的。