Patent ID: 7341029

Claim:
An adjusting device for adjusting a rotational position of a camshaft relative to a crankshaft of a reciprocating piston engine, the adjusting device comprising: an input shaft rotationally fixed to the crankshaft; an output shaft rotationally fixed to the camshaft; a servomotor; an adjusting shaft nonrotatably coupled to the rotor of a servomotor; limit stops configured to limit a torsional angle between the camshaft and the crankshaft; and a control circuit connected to the servomotor and configured to control a phase velocity of the torsional angle; wherein a stationary gear ratio exists between the adjusting shaft and the output shaft, and further comprising a crankshaft speed signal device for outputting a crankshaft speed signal, a rotor speed signal device for outputting a speed signal for a rotor speed ω Em of the servomotor, and a signal-processing device connected to the crankshaft speed signal device and the rotor speed signal device and configured to generate a setpoint signal for the rotor speed from the crankshaft speed signal, from the stationary gear ratio, and from a setpoint value for the phase velocity, the setpoint signal being associated with a rotor-speed setpoint input of the control circuit.