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    • 9. 发明申请
    • Method And Device For Operating An SCR System
    • 操作SCR系统的方法和装置
    • US20140096511A1
    • 2014-04-10
    • US14119085
    • 2012-05-21
    • Philippe GrassDenny Schädlich
    • Philippe GrassDenny Schädlich
    • F01N3/20
    • F01N3/2066F01N11/00F01N2550/05F01N2560/026F01N2560/12F01N2560/20F01N2610/10F01N2900/1814F01N2900/1818G01N29/024G01N29/07G01N29/326G01N2291/0224G01N2291/02809Y02A50/2325Y02T10/24Y02T10/47
    • A method for operating a selective catalytic reduction (SCR) system having a urea solution supply and an ultrasound based urea concentration sensor, the measurement signal of the urea concentration sensor being representative of a propagation time of an ultrasonic pulse along a predefined path length in a fluid of the urea solution supply includes: heating at least the fluid in a detection region of the urea concentration sensor from a predefined first temperature to a predefined second temperature; during the heating, detecting the measurement signal at at least a third and fourth temperature, and in each case determining a raw concentration characteristic value as a function of the respective measurement signal, which raw concentration characteristic value is representative of the propagation time of the ultrasonic pulse; and determining a concentration characteristic value, representative of a concentration of urea in the fluid, as a function of the raw concentration characteristic values.
    • 一种用于操作具有尿素溶液供应和基于超声波的尿素浓度传感器的选择性催化还原(SCR)系统的方法,所述尿素浓度传感器的测量信号代表超声波脉冲沿着预定路径长度的传播时间 所述尿素溶液供给流体包括:至少将所述尿素浓度传感器的检测区域中的流体从预定的第一温度加热到预定的第二温度; 在加热期间,在至少第三和第四温度下检测测量信号,并且在每种情况下确定作为各个测量信号的函数的原始浓度特性值,该原始浓度特性值表示超声波的传播时间 脉冲; 以及根据原料浓度特性值确定代表流体中尿素浓度的浓度特征值。