A method for determining the rotation speed of at least one supercharger (14) in an internal combustion engine (1); the method includes detecting, by means of a microphone (25), the intensity of a sound signal generated by the rotation of the supercharger ...

The method for determining sensor function of an exhaust valve involves measuring the throttled input air flow for comparison to a preset target value. For sensor diagnosis for the exhaust valve the measurement can be carried out at higher engine speeds. T...