公开(公告)号：US20230126047A1

公开(公告)日：2023-04-27

申请号：US17911295

申请日：2021-03-24

Applicant: Hitachi Astemo, Ltd.

Inventor： Daisuke KOJIMA ,  Norikazu MATSUZAKI ,  Masayuki KIKAWA

IPC: B60T13/74 ,  H02P29/00 ,  H02P29/60

Abstract: Provided is a parking brake control device configured to, when releasing a hold on a braking force, energize an electric motor, and change a drive time of the electric motor in accordance with a current change amount in a predetermined interval after a predetermined time has elapsed since a current value of the electric motor starts to decrease after increasing and a current value at which the current change amount of the electric motor converges to a predetermined value or less.

公开(公告)号：US20230227017A1

公开(公告)日：2023-07-20

申请号：US17928793

申请日：2021-05-13

Applicant: Hitachi Astemo, Ltd.

Inventor： Shunsuke ARITOMI ,  Shinji SETO ,  Norikazu MATSUZAKI ,  Kimio NISHINO ,  Daisuke KOJIMA

IPC: B60T13/74 ,  H02P29/40 ,  B60T13/66

CPC classification number: B60T13/74 ,  H02P29/40 ,  B60T13/662

Abstract: Accurately controlling pressing thrust regardless of an individual difference and a use situation of a brake apparatus, and the like are set forth herein. The present invention controls a motor that applies thrust to a piston that presses a brake pad, in a current variation period before an idling current period, a variation in the current and the voltage or a variation in a function including the current and the voltage in the idling current period is computed as a plurality of prospective values. At a predetermined time T0 during the current variation period, one of the plurality of prospective values is selected on the basis of the current and the voltage, and on the basis of the variation in the current and the voltage or the function related to the selected prospective value, a characteristic parameter of the motor is computed to compute a stop current of the motor.

公开(公告)号：US20230043134A1

公开(公告)日：2023-02-09

申请号：US17790570

申请日：2020-10-22

Applicant: Hitachi Astemo, Ltd.

Inventor： Shinji SETO ,  Shunsuke ARITOMI ,  Ryu KAI ,  Kimio NISHINO ,  Daisuke KOJIMA

IPC: B60T13/74 ,  B60T7/12 ,  F16D65/18

Abstract: Provided fire an electric parking brake device and an electric parking brake control method that can apply an appropriate clamping force by accelerating data measurement and by suppressing influence of load fluctuation during idle rum For this end, the electric parking brake device of the present invention includes: a disc rotor; brake pads that are pressed to the disc rotor; an electric motor that imparts a thrust to the brake pads; a current detection unit that detects a motor current of the electric motor; and a brake control device that controls the electric motor 8 based on the motor current. The brake control device controls the electric motor 8 based on a current change amount of an electric current during a period from a point of time that the motor current becomes a peak current to a predetermined point of time.