Patent ID: 7925408
Filing Date: 2011-04-12
Classification: B60T,H02P

Abstract:
1. An electric parking brake system, comprising: a brake that includes a rotating body which has a friction face, the rotating body being configured to rotate together with a wheel, a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body and which friction member is configured to suppress a rotation of the rotating body when being pushed against the friction face of the rotating body, and a pushing mechanism configured to push the friction member against the friction face of the rotating body; an electric motor; a motion conversion mechanism configured to convert a rotation of a rotating shaft of the electric motor into a linear motion of an output member of the motion conversion mechanism; a connection unit that is connected at one end to the output member of the motion conversion mechanism, and that is connected at the other end to the pushing mechanism; a maintaining mechanism configured to maintain a friction member pushing force that is a force with which the friction member is pushed against the friction face in the brake, when electric current is not supplied to the electric motor; and a pushing force control unit configured to control the electric motor such that the friction member pushing force in the brake approaches a target value that is set based on a moving force applied to a vehicle, wherein the pushing force control unit includes