Method and device for operating an internal combustion engine

摘要

In order to operate an internal combustion engine, a value of an operating variable of the internal combustion engine is determined depending on at least one measured quantity of the internal combustion engine. A test is carried out to determine whether or not the value of the operating variable is plausible depending on at least one second measured quantity of the internal combustion engine. If the value of the operating variable is implausible, a test is carried out to determine whether or not the internal combustion engine is currently being operated in lean operation. If the internal combustion engine is currently being operated in lean operation, a changeover to the quasi-stoichiometric operation of the internal combustion engine is implemented. After the changeover to the quasi-stoichiometric operation, the value of the operating variable is determined anew and tested anew. A changeover to lean operation is carried out anew if the newly determined value of the operating variable is plausible.