Patent ID: 8198849

Claim:
A method of protecting against jamming in a motor-driven locking system, the method comprising: implementing a first locking process; detecting a first stiffness during the first locking process; reversing a drive direction; saving a position value of a position of the first stiffness; saving an amplitude value of the first stiffness; increasing a counter value of a counter; implementing a second locking process; upon detecting a second stiffness, detecting a position value and an amplitude value of the second stiffness; comparing the position value of the first and the second stiffness, and upon an evaluation in that the comparison results in a same position, comparing an actual counter value with a default counter value; and upon determining that the actual counter value is the same as the default value, compensating for the stiffness at the position by a partial compensation with a compensation value based on an amplitude value of the stiffness.