公开(公告)号：US20240166177A1

公开(公告)日：2024-05-23

申请号：US18282611

申请日：2022-03-07

Applicant: Hitachi Astemo, Ltd.

Inventor： Suguru SAOTOME ,  Hirohito TADA ,  Norikazu MATSUZAKI ,  Masayuki KIKAWA

IPC: B60T8/172 ,  B60T8/171 ,  B60T13/14 ,  B60T13/58 ,  B60T13/74 ,  H02P3/04

CPC classification number: B60T8/172 ,  B60T8/171 ,  B60T13/588 ,  B60T13/746 ,  H02P3/04 ,  B60T13/145

Abstract: In an application, which refers to holding actuation of a parking brake mechanism (a rotation-linear motion conversion mechanism), a braking control apparatus (a parking brake control apparatus) determines an application stroke from a load detection point including as far as an overshoot amount. The load detection point is a generation point of a thrust force that is detected due to a current flowing in the electric motor. The overshoot amount is generated based on a rotation of an electric motor due to inertia after driving of the electric motor is stopped. The braking control apparatus determines a target release stroke in a release, which is release actuation of the parking brake mechanism, according to the application stroke. The braking control apparatus outputs a control instruction to conduct the release based on the target release stroke.

公开(公告)号：US20240166178A1

公开(公告)日：2024-05-23

申请号：US18283078

申请日：2022-03-09

Applicant: Hitachi Astemo, Ltd.

Inventor： Masayuki KIKAWA ,  Norikazu MATSUZAKI ,  Naoshi YAMAGUCHI

IPC: B60T8/172 ,  B60T1/06 ,  B60T8/171 ,  B60T13/74 ,  F16D55/226 ,  F16D65/18 ,  F16D121/04 ,  F16D121/24 ,  F16D125/06

CPC classification number: B60T8/172 ,  B60T1/065 ,  B60T8/171 ,  B60T13/746 ,  F16D55/226 ,  F16D65/18 ,  B60T2220/04 ,  F16D2121/04 ,  F16D2121/24 ,  F16D2125/06

Abstract: A parking brake control apparatus acquires a first physical amount indicating a change in a current applied to an electric motor (for example, a gradient of a change in a current) at the time of an application operation. The parking brake control apparatus sets a second physical amount indicating completion of the application operation so as to make it smaller when the first physical amount (for example, the gradient of the change in the current) exceeds a predetermined threshold value, compared to when the first physical amount is equal to or smaller than the threshold value. The parking brake control apparatus determines the completion of the application operation when a physical amount indicating the application operation (for example, a current value) reaches the second physical amount.

公开(公告)号：US20240157917A1

公开(公告)日：2024-05-16

申请号：US18281617

申请日：2021-10-15

Applicant: Hitachi Astemo, Ltd.

Inventor： Tatsuro KOBUNE ,  Norikazu MATSUZAKI ,  Masayuki KIKAWA

IPC: B60T8/171 ,  B60T8/172 ,  B60T13/74 ,  F16D65/18 ,  F16D121/24 ,  H02P3/04

CPC classification number: B60T8/171 ,  B60T8/172 ,  B60T13/746 ,  F16D65/18 ,  H02P3/04 ,  F16D2121/24

Abstract: A parking brake control apparatus (24) stops driving of an electric motor (7A) when a current value of the electric motor (7A) reaches a target current threshold value, when driving the electric motor (7A) to press brake pads (6C) against a disk rotor (4) and hold a braking force. The target current threshold value is a current value for stopping the driving of the electric motor (7A). The parking brake control apparatus (24) changes the target current threshold value according to a rotational acceleration of the electric motor (7A).

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：US20230174036A1

公开(公告)日：2023-06-08

申请号：US17439264

申请日：2020-05-26

Applicant: Hitachi Astemo, Ltd.

Inventor： Suguru SAOTOME ,  Norikazu MATSUZAKI ,  Masayuki KIKAWA

IPC: B60T13/14 ,  B60T8/1761 ,  B60T13/58 ,  B60T13/74

CPC classification number: B60T13/147 ,  B60T8/17616 ,  B60T13/58 ,  B60T13/741 ,  B60T13/745 ,  B60T2270/10 ,  B60T2201/06 ,  B60T8/1755

Abstract: An ESC 33 increases distribution of a braking force to rear wheels according to a reduction in a speed of a vehicle due to braking, and distributes the braking force so as to allow the vehicle to be kept stopped due to braking forces applied to the rear wheels when the vehicle stopped. Then, a second ECU holds the braking force by driving a parking mechanism with the vehicle kept stopped due to the braking forces applied to the rear wheels.