用于诊断排气传感器的电接触的方法

Method for diagnosing electrical contact connection of an exhaust gas sensor

Abstract

本发明涉及用于诊断排气传感器的电接触的方法。本发明描述了一种用于诊断排气传感器的电接触的方法,其中,借助两个电源(I1,I2)将电流注入到所述排气传感器的泵单元(PZ)和参考单元(RZ)中。在线路有故障时,相对应的电流不能流过,并且相对应的电源(I1,I2)上的电压取大的值。在第二线路(L2)有故障的情况下,对与所述两个单元(PZ,RZ)的连接点相连的第二端子(2)上的电压的测量在借助第二开关(S2)分离相对应的第二端子(2)与参考电势(Vm)时得出低的值,因为单元电容不会被充电到参考电势(Vm)。
The invention relates to a method for diagnosing electrical contact connector of an exhaust gas sensor. A method diagnoses electrical contact connection of an exhaust gas sensor, in which two current sources (I1, I2) are used to impress currents into a pump cell (PZ) and a reference cell (RZ) of the exhaust gas sensor. If a line is faulty, the relevant current cannot flow and a voltage on the relevant current source (I1, I2) assumes a high value. If a second line (L2) is faulty, measurement of the voltage on the second terminal (2), which is connected to the connecting point between the two cells (PZ, RZ), provides a low value when the relevant second connection is isolated from the reference-ground potential (Vm) by a second switch (S2), since the cell capacitances have not been able to charge to the reference-ground potential (Vm).

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