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    • 24. 发明公开
    • VERFAHREN ZUR ÜBERWACHUNG EINER BREITBANDLAMBDASONDE
    • VERFAHREN ZURÜBERWACHUNGEINER BREITBANDLAMBDASONDE
    • EP2795307A1
    • 2014-10-29
    • EP12798190.0
    • 2012-11-15
    • Robert Bosch GmbH
    • LEDERMANN, BernhardBEVOT, ClaudiusREISCHL, Rolf
    • G01N27/419F01N11/00G01N33/00
    • F02D41/1495F02D41/1456F02D41/222G01N27/419G01N33/0006G01N33/0036G01N33/007Y02T10/40
    • The invention relates to a method for determining a polarization of a pump cell and/or a Nernst cell of a lambda probe for diagnosing the broadband lambda probe. The invention provides for a voltage or current pulse (12) to be applied to the pump cell and/or the Nernst cell in a first method step, and for a voltage at the pump cell (22, 26) and/or the Nernst cell or a variable related to the polarization or the temporal profile thereof to be determined in a second method step and to be used as a measure of the polarization, and for the function of the broadband lambda probe to be monitored via the polarization determined. The polarization can be determined as a voltage measurement which is carried out once or repeatedly or by determining the effect of the polarization in an associated controller such as a pumping current regulator of an engine controller. The variable related to the polarization may be the reaction of the pumping current regulator.
    • 用于确定用于诊断宽带λ探针的λ探针的泵浦电池和/或能斯特细胞的极化的方法。 在第一种方法任务中,在泵/能斯特细胞上施加电压或电流脉冲,并且在第二种方法任务中,在泵浦电池和/或能斯特电池处的电压或与极化有关的变量或 其时间特性被确定并用作极化的度量,并且通过确定的极化来监测宽带λ探针的功能。 极化的确定可以作为执行一次或多次的电压测量来执行,或者通过确定诸如发动机控制单元的泵电流控制器的关联控制器中的极化的影响来执行。 与偏振相关的变量可能是泵电流控制的反应。