| 摘要 |
A motor-driven disk brake system capable of preventing a pressing member from moving beyond a predetermined position at a time of stopping a motor. When a command for system termination is issued, a process of alternate intervals A and B is conducted to reduce a motor current intermittently and to correspondingly reduce a motor displacement gradually, such that a return force such as a torque stored in a coil spring (return spring) is spent gradually on a return displacement of a motor 11 and a piston, so as to prevent a rotational speed of a rotor from increasing. In this way, a motor displacement and an operation of returning a piston can be stopped smoothly. Therefore, it is possible to prevent a large accelerated backward movement of the motor 11 and the piston (thus a backward movement of the piston beyond a predetermined position) due to inertia, which may occur when the return force acts all at once on the return displacement of the motor 11 and the piston. In this way, the piston can be properly stopped near a standby position of non-braking state before a system termination. As a result, a next activation of the motor-driven disk brake system can be conducted promptly.
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