| 摘要 |
The invention relates to a method for monitoring an oil gas measuring capability of an exhaust gas probe in an exhaust gas channel of an internal combustion engine operated with lean combustion, wherein in the exhaust gas probe, exhaust gas from the exhaust gas channel diffuses into a measuring cavity of the exhaust gas probe via a diffusion barrier and wherein oxygen is pumped into or out of the measuring cavity via a pump cell, which comprises an inner pump electrode and a second pump electrode, by applying a pump voltage between the electrodes according to a flowing pump current. During operation of the internal combustion engine with lean combustion, the pump device of the pump cell is reversed in a diagnosis phase and oxygen is pumped into the measuring cavity, and the oil gas measuring capability of the exhaust gas probe is determined from the pump flow and/or the pump voltage. The invention further relates to a device for carrying out the method. The method and the device enable the diagnosis of the oil gas measuring capability of the exhaust gas probe without conducting a conversion of the exhaust gas composition of the internal combustion engine to an oily exhaust gas. An increase in the fuel consumption by or the emissions from the internal combustion engine can thus be prevented. |
