Continental Automotive Gmbh

Muammer Kilinc

Tim Walde

Tino Arlt

Bertrand Lemire

Thomas Baumann

Johannes Bentner

Sabrina Kolbeck

A method for operating a probe having a pumped reference cell. A pulse-width-modulated pump current is applied to the reference cell at a first point in time. In accordance with the first point in time, a first voltage characteristic value (representing the voltage applied to the reference cell) is determined within a first time frame. The pulse-width-modulated pump current applied to the reference cell is switched off at a second point in time. A third point in time is determined, at which a pulse-width-modulated pump current applied to the reference cell is switched off. In accordance with the third point in time, a second voltage characteristic value (representing the voltage applied to the reference cell) is determined within a second time frame. The first and second voltage characteristic values are used to determine a diagnostic characteristic value, which is representative of an error in determining the nitrogen oxide concentration.

Method for operating a probe

A first voltage (V) is detected between an auxiliary pump electrode and a reference electrode of an exhaust gas sensor, and a target diagnosis value (SDIAG) is determined as a function of the detected first voltage (V). A measured current (Im) is detected between a measurement electrode and a second main pump electrode of the exhaust gas sensor, said measured current being set up as the pump current by regulating a second voltage between the measurement electrode and the reference electrode to a pre-defined voltage. An actual diagnosis value (IDIAG) is determined as a function of the detected measured current (Im). An error (ERR) of the exhaust gas sensor is recognized depending on the target diagnosis value (SDIAG) and the actual diagnosis value (IDIAG).

Method and device for examining an exhaust gas sensor

In a method and a device for the diagnosis of an NOx sensor () for an internal combustion engine, during a homogenous operation of the internal combustion engine, a base diagnostic value (NOx_DIAG_BAS) of the NOx sensor () is determined as a function of a reference value (I_REF) of a measuring signal of the NOx sensor () determined in a new state of the NOx sensor () and a current value (I_AV) of the measuring signal of the NOx sensor (). A time-dependent measuring value sequence (O2_EG_T) of the oxygen content of the exhaust gas in the exhaust gas system () is determined by the exhaust gas probe (). Depending on the measuring value sequence (O2_EG_T) of the oxygen content of the exhaust gas, and the base diagnostic value (NOx_DIAG_BAS) of the NOx sensor (), a corrected diagnostic value (NOx_DIAG_COR) is determined for the NOx sensor ().

Growing community of inventors

Wuppertal, Germany

Muammer Kilinc