| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely detect the freezing of a brake operating force transmission system of an electric parking brake apparatus and surely de-freeze the system. <P>SOLUTION: This electric parking brake apparatus operates wheel brakes by driving the brake operating force transmission system in one direction by a brake operating force generated by an electric motor, to hold the brake operating force by an electromagnetic brake when the electric motor is stopped. While operating the electric parking brake apparatus, the presence or absence of the freezing of the brake operating force transmission system is determined based on the movement amount of the brake operating force transmission system by the time when a predetermined time is passed after the electromagnetic brake is released S7. If a freezing occurs, the ice adhered to the brake operating force transmission system is crushed for de-freezing by driving the electric motor in one direction to further pull the brake operating force transmission system S11. <P>COPYRIGHT: (C)2007,JPO&INPIT |
