Patent ID: 8360020

Claim:
Method for determining a scanning ratio for a characteristic curve for operating an electromagnetic valve of a camshaft adjuster, comprising the steps: determining an ambient temperature of the camshaft adjuster, determining a relative movement of a camshaft to a reference point, setting a scanning ratio of the electromagnetic valve, so that a relative movement of the camshaft to the reference point is stopped, storing the set scanning ratio as a hold scanning ratio in a first operating state for the determined ambient temperature, determining another scanning ratio for another operating state for a scanning ratio characteristic curve of the valve at the determined ambient temperature based on the determined hold scanning ratio, further comprising a motor stoppage: recognizing a stop condition, determining a rotational speed of a crankshaft, wherein the rotational speed of the crankshaft is coupled with a rotational speed of the camshaft, setting an adjustment angle of the camshaft adjuster deviating from a locking angle by setting another scanning ratio and by setting the hold scanning ratio holding the adjustment angle deviating from the locking angle as long as the rotational speed of the crankshaft deviates from 0.