Patent ID: 7898195
Filing Date: 2011-03-01
Classification: B60N,H02P

Abstract:
1. A motor drive device for a backrest of a vehicle seat comprising: a motor for driving a movable backrest of a vehicle seat; a motor control device for controlling normal rotation, stop or reverse rotation of the motor; a rotation detector for detecting rotation of the motor and outputting a pulse corresponding to the motor speed; and the motor control device detecting jamming by the movable backrest against other members in the vehicle by judging whether an integral value of change amounts of a pulse period from the rotation detector exceeds a specified threshold or not, and stops or inverts the motor, wherein the integration of change amounts of the pulse period by the motor control device is executed by: integrating the ratio of an arbitrary first number of pulse periods, and the same number of pulse periods as the arbitrary first number outputted from the rotation detector after the arbitrary first number of pulses, for an arbitrary second number of times.