公开(公告)号：US20220073038A1

公开(公告)日：2022-03-10

申请号：US17417476

申请日：2019-12-18

Applicant: Hitachi Astemo, Ltd.

Inventor： Sota SUZUKI ,  Tatsuro KOBUNE ,  Wataru YOKOYAMA ,  Kenichiro MATSUBARA

IPC: B60T8/17 ,  F16D65/18 ,  B60T13/74 ,  B60T17/22 ,  H02P3/04

Abstract: An electric brake mechanism includes a piston (6D) propelled by a rotation-linear motion mechanism (8) driven by an electric motor (7A). The piston (6D) is configured to press brake pads (6C) against a disc rotor (4), and to hold the brake pads (6C) at a pressing position by stopping the electric motor (7A). A parking brake control device (24) is configured to determine, when a request (application command) to hold the brake pads (6C) is made, a judgment timing for judging whether to stop the electric motor (7A) based on a change trend of a current value of the electric motor (7A). When the judgment timing is reached, the parking brake control device (24) judges whether or not to stop the electric motor (7A).

公开(公告)号：US20220153245A1

公开(公告)日：2022-05-19

申请号：US17439533

申请日：2020-03-18

Applicant: Hitachi Astemo, Ltd.

Inventor： Takahiro ITO ,  Kenichiro MATSUBARA ,  Wataru YOKOYAMA

IPC: B60T8/1761 ,  B60T7/04 ,  B60T7/22 ,  B60T8/92 ,  B60T13/14 ,  B60T17/18

Abstract: An object of the present invention is to provide a brake control apparatus including a backup brake, which brake control apparatus makes it possible both to ensure deceleration, and to attain vehicle running stability.
The present invention includes: a front-wheel-side braking mechanism 4 that includes a front-wheel-side electric hydraulic mechanism 6, and a hydraulic circuit system, and applies braking force to front wheels 2L, and 2R; a rear-wheel-side braking mechanism 5 that applies braking on a rear wheel side; a backup brake that is actuated in accordance with a switch to the hydraulic circuit system 15 when the front-wheel-side electric hydraulic mechanism 6 fails, and applies braking force to the front wheels 2R, and 2L; and a skid determination threshold setting section 43 that sets a skid determination threshold. When the backup brake is actuated, the skid determination threshold setting section 43 sets the skid determination threshold for the rear wheels 3L, and 3R on the basis of braking force information of the backup brake.