Electric parking brake device
AssigneeHitachi Astemo, Ltd.
InventorsSandip Purane, Yasuhiro Yamamoto, Mari Takahashi
Life of this patent
Estimating the term…
Abstract
Provided is an electric parking brake device in which a drum brake includes braking gap automatic adjustment means and a parking brake lever, and the operation of an electric actuator that drives the parking brake lever is controlled by a control unit. When an application operation time of the electric actuator (38) by the time when a parking brake state is obtained has exceeded a predetermined application operation end determination time (T2), the control unit (C) determines that the braking gap automatic adjustment means (18) is abnormal. With this configuration, at the time of obtaining the parking brake state, the presence or absence of abnormality in the braking gap automatic adjustment means can be determined.
Claims3
An electric parking brake device, comprising:
- a drum brake including:
- braking gap automatic adjuster for automatically adjusting a gap between a pair of brake shoes and a brake drum;
- and
- a parking brake lever configured to operate between an operation position for obtaining a parking brake state by bringing the pair of brake shoes into slide contact with the brake drum and a non-operation position for releasing the parking brake state;
- an electric actuator configured to exert power for driving the parking brake lever;
- and
- a control unit configured to control the operation of the electric actuator,
- wherein, when an application operation time of the electric actuator by a time when the parking brake state is obtained has exceeded a predetermined application operation end determination time, the control unit determines that the braking gap automatic adjuster is abnormal.
Dependencies are inferred from the claim text.