Patent ID: 8024103

Claim:
A method for monitoring an exhaust gas turbocharger of an internal combustion engine, the method comprising: determining a variable that is characteristic of a rotational speed of the exhaust gas turbocharger in at least one operating state of the internal combustion engine using a rotational speed sensor; selecting an operating state, which is characterized by a change in an exhaust gas mass flow which is linked to a change in the variable that is characteristic of the rotational speed of the exhaust gas turbocharger within a predefined tolerance range, as the at least one operating state using an analysis unit; comparing the change in the variable that is characteristic of the rotational speed of the exhaust gas turbocharger to the predefined tolerance range using a comparison unit; and recognizing a fault if, in the selected operating state, at least one value outside the predefined tolerance range is established using a fault recognition unit.