公开(公告)号：US11993239B2

公开(公告)日：2024-05-28

申请号：US17276969

申请日：2019-09-17

Applicant: Hitachi Astemo, Ltd.

Inventor： Daisuke Goto

IPC: B60T8/17 ,  B60T13/74 ,  B60T17/22 ,  F16D55/226 ,  F16D65/18 ,  F16D65/38 ,  F16D66/00 ,  F16D121/24 ,  F16D125/40 ,  F16D125/48 ,  F16D125/50 ,  F16D127/02

CPC classification number: B60T8/17 ,  B60T13/746 ,  B60T17/221 ,  F16D65/18 ,  F16D66/00 ,  B60T2201/12 ,  F16D55/226 ,  F16D2065/386 ,  F16D2066/005 ,  F16D2121/24 ,  F16D2125/40 ,  F16D2125/48 ,  F16D2125/50 ,  F16D2127/02

Abstract: An electric brake including: a brake mechanism configured to transmit a thrust force generated through drive of an electric motor to a piston, the piston being configured to move brake pads to be pressed against a disc rotor; a thrust force sensor configured to detect the thrust force transmitted to the piston; and an ECU for rear electric brake configured to control, based on a detection value obtained by the thrust force sensor, the drive of the electric motor in accordance with a brake command. The ECU for rear electric brake is configured to learn, as a reference point of a piston thrust force, a detection value obtained by the thrust force sensor when the electric motor is driven to move the piston in a direction for pressing the piston against the disc rotor in a range in which the brake pads are not in contact with the disc rotor.

公开(公告)号：US12115957B2

公开(公告)日：2024-10-15

申请号：US17435797

申请日：2020-03-09

Applicant: Hitachi Astemo, Ltd.

Inventor： Daisuke Goto ,  Haruhiko Fujita

IPC: B60T8/175 ,  B60T17/22

CPC classification number: B60T17/22 ,  B60T8/175

Abstract: A rear electric brake electronic control unit (ECU) includes a delay circuit between a microcomputer of the rear electric brake ECU and a switch for driving a solenoid of a parking mechanism. The delay circuit is configured to delay a signal for driving the switch. The rear electric brake ECU further includes a diagnosis circuit for diagnosing an actuation state of the microcomputer. The diagnosis circuit is able to shut off a power supply to the solenoid regardless of a state of a signal of the solenoid if the actuation state of the microcomputer is abnormal.

公开(公告)号：US12097833B2

公开(公告)日：2024-09-24

申请号：US17276955

申请日：2019-09-12

Applicant: Hitachi Astemo, Ltd.

Inventor： Wataru Yokoyama ,  Daisuke Goto

IPC: B60T8/17 ,  B60T13/74 ,  B60T17/22 ,  F16D55/226 ,  F16D65/18 ,  F16D66/00 ,  F16D125/40 ,  F16D55/00 ,  F16D65/38 ,  F16D121/24 ,  F16D125/48 ,  F16D125/50 ,  F16D127/02

CPC classification number: B60T8/17 ,  B60T13/746 ,  B60T17/221 ,  F16D55/226 ,  F16D65/18 ,  F16D66/00 ,  B60T2201/12 ,  F16D2055/0029 ,  F16D2065/386 ,  F16D2066/003 ,  F16D2121/24 ,  F16D2125/40 ,  F16D2125/48 ,  F16D2125/50 ,  F16D2127/02

Abstract: Provided is an electric brake including: a brake mechanism configured to transmit, based on a braking request, a thrust force generated through drive of an electric motor to a piston configured to move brake pads to be pressed against a disc rotor; and an ECU for rear electric brake configured to control the drive of the electric motor, and to move, in a non-braking state, the piston to a predetermined clearance position at which a clearance between each of the brake pads and the disc rotor is a predetermined amount. The ECU for rear electric brake is configured to drive the electric motor so that a period from generation of the braking request to a start of the pressing of the disc rotor by the brake pads is a predetermined period regardless of a position of the piston at a time when the braking request is generated.

公开(公告)号：US11801849B2

公开(公告)日：2023-10-31

申请号：US17792263

申请日：2021-01-13

Applicant: Hitachi Astemo, Ltd.

Inventor： Haruhiko Fujita ,  Daisuke Goto

IPC: B60K23/04 ,  B60W10/192 ,  B60W50/029 ,  F16H48/20 ,  B60W50/02 ,  F16H48/22 ,  B60W10/12 ,  B60W10/184 ,  B60T8/92 ,  B60T8/88 ,  B60T13/74 ,  B60T17/18 ,  B60W10/16 ,  B60W30/18

CPC classification number: B60W50/029 ,  B60K23/04 ,  B60T8/885 ,  B60T8/92 ,  B60T13/74 ,  B60T17/18 ,  B60W10/16 ,  B60W10/184 ,  B60W30/18109 ,  F16H48/20 ,  B60T2220/03 ,  B60T2220/04 ,  B60T2250/04 ,  B60T2270/402 ,  B60T2270/406 ,  B60W2050/0297 ,  B60W2510/18 ,  B60W2520/10 ,  B60W2540/18 ,  B60W2710/12 ,  B60W2710/18 ,  F16H2048/205

Abstract: An electrically controlled differential gear is disposed between a right front wheel and a left front wheel of a vehicle. The electrically controlled differential gear includes a clutch mechanism that limits a differential operation of the electrically controlled differential gear. A second ECU (control portion) obtains information as to failure associated with actuation of a right front electric brake mechanism. The second ECU obtains a physical amount relating to a required braking force which is applied to the left front wheel and the right front wheel. The second ECU outputs a differential limiting control command for limiting the differential operation of the electrically controlled differential gear to the clutch mechanism (or more specifically, a differential ECU that controls the clutch mechanism) based on the information as to the failure and the physical amount relating to the required braking force.