Patent ID: 7082363

Claim:
A control unit including an executable control program which executes a method for determining a rotational speed of a crankshaft of an internal combustion engine having a sensor disk which is connected to the crankshaft of the internal combustion engine, the sensor disk having markings via a system of alternating teeth and tooth spaces, the method comprising: with a first sensor assigned to the sensor disk, generating an electrical signal which is able to assume at least two signal levels, one of the signal levels being assigned to a tooth and another of the signal levels being assigned to a tooth space; and determining the rotational speed of the crankshaft with a control unit from an angle between two markings on the sensor disk divided by a time elapsed between the two markings, wherein a number of additional markings are situated between the two markings, the number of additional markings being a function of the rotational speed.