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1.发明公开公开(公告)号：US20240262331A1
公开(公告)日：2024-08-08
申请号：US18567988
申请日：2022-06-02
Applicant: Hitachi Astemo, Ltd.
Inventor： Koki TAKIMOTO , Daisuke GOTO , Takuya USUI
IPC: B60T13/74 , F16D65/18 , F16D121/24
CPC classification number: B60T13/74 , F16D65/18 , F16D2121/24
Abstract: A motor control device includes a first control unit and/or a second control unit serving as a control unit. The control unit outputs, to a first motor drive unit, a first current command for energizing a first winding set so that first torque, which is torque greater than torque generated in a brake motor by a torque command for generating requested torque requested of the brake motor, and which is in the same direction as a direction of the requested torque, is generated. The control unit also outputs, to a second motor drive unit, a second current command for energizing a second winding set so that second torque, which is torque based on a difference between the requested torque and the first torque, and which is in a direction reverse to the direction of the first torque, is generated.
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公开(公告)号：US20220032886A1
公开(公告)日：2022-02-03
申请号：US17276969
申请日：2019-09-17
Applicant: Hitachi Astemo, Ltd.
Inventor： Daisuke GOTO
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.
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公开(公告)号：US20230070909A1
公开(公告)日：2023-03-09
申请号：US17799995
申请日：2021-01-29
Applicant: Hitachi Astemo, Ltd.
Inventor： Koki TAKIMOTO , Daisuke GOTO , Takuya USUI
IPC: B60T8/172 , B60T13/74 , F16D65/18 , B60T1/06 , F16D55/226
Abstract: Left front electric brake mechanisms apply a braking force to a left front wheel by actuating an “electric motor of a first left front electric brake mechanism” and an “electric motor of a second left front electric brake mechanism” controllable independently of each other. A first ECU (a control portion) acquires a target thrust force instruction value to be generated on the left front electric brake mechanisms based on a target braking force to be applied to the left front wheel. The first ECU (the control portion) outputs a first control instruction for actuating the electric motor of the first left front electric brake mechanism and a second control instruction for actuating the electric motor of the first left front electric brake mechanism according to a change amount of the target thrust force instruction value.
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公开(公告)号：US20240039451A1
公开(公告)日：2024-02-01
申请号：US18266041
申请日：2021-12-03
Applicant: Hitachi Astemo, Ltd.
Inventor： Haruhiko FUJITA , Takuya USUI , Daisuke GOTO
IPC: H02P29/028 , H02M1/32
CPC classification number: H02P29/028 , H02M1/325
Abstract: A motor control apparatus controls a brake motor. The motor control apparatus includes a first motor driving portion, a first control portion, a second motor driving portion, and a second control portion. The second control portion is connected to the first control portion. The second control portion has s self-diagnosis function not provided to the first control portion. The second control portion monitors a state of a phase current in the first motor driving portion. For example, the second control portion determines that the first control portion is abnormal in a case where the waveform of the phase current in the first motor driving portion is outside a range of an expected current waveform.
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Patent Agency Ranking
公开(公告)号：US20230042441A1
公开(公告)日：2023-02-09
申请号：US17792263
申请日：2021-01-13
Applicant: Hitachi Astemo, Ltd.
Inventor： Haruhiko FUJITA , Daisuke GOTO
IPC: B60W50/029 , B60T13/74 , B60K23/04 , B60T17/18 , F16H48/20 , B60T8/92 , B60T8/88 , B60W10/16 , B60W10/184 , B60W30/18
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.
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公开(公告)号：US20220144237A1
公开(公告)日：2022-05-12
申请号：US17435797
申请日：2020-03-09
Applicant: Hitachi Astemo, Ltd.
Inventor： Daisuke GOTO , Haruhiko FUJITA
Abstract: A rear electric brake ECU includes a delay element. More specifically, the delay element is disposed between an arithmetic element of the rear electric brake ECU and a first switching element (an FET) for driving a solenoid of a parking mechanism. The delay element delays a signal for driving this first switching element. Further, the rear electric brake ECU includes a diagnosis device for diagnosing the actuation state of the arithmetic element. The diagnosis device is set so as to be able to shut off power supply to the solenoid regardless of the state of a signal (a driving signal) of the solenoid if diagnosing that the actuation state of the arithmetic element is abnormal.
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公开(公告)号：US20220032885A1
公开(公告)日：2022-02-03
申请号：US17276955
申请日：2019-09-12
Applicant: Hitachi Astemo, Ltd.
Inventor： Wataru YOKOYAMA , Daisuke GOTO
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.
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公开(公告)号：US20240322724A1
公开(公告)日：2024-09-26
申请号：US18578108
申请日：2022-06-01
Applicant: Hitachi Astemo, Ltd.
Inventor： Hiroaki SATO , Daisuke GOTO , Katsuya IWASAKI
CPC classification number: H02P21/22 , B60T13/74 , H02P2207/05
Abstract: A synchronous motor driving device which accurately estimates and limits direct current (DC), without a dedicated current detection sensor. The device includes a first DC calculation unit that calculates a first DC based on a first voltage command value, a current value of a winding of a synchronous motor, and a battery voltage; a second DC calculation unit that calculates a second DC based on a current value of the winding of the synchronous motor, a rotation speed of the synchronous motor, and a predetermined motor characteristic; a model error extraction unit calculating inverter efficiency based on the first and second DC; a DC correction unit that calculates an estimated DC on the basis of the first and second DC, and the inverter efficiency; and a DC limiting unit that corrects a current command value of the winding based on the estimated DC and a predetermined DC limit value.
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公开(公告)号：US20240239312A1
公开(公告)日：2024-07-18
申请号：US18561450
申请日：2022-04-26
Applicant: Hitachi Astemo, Ltd.
Inventor： Takahiro ITO , Takuya USUI , Daisuke GOTO
Abstract: Provided is a high-performance brake control device capable of effectively suppressing a vehicle body vibration generated during traveling on a road with a step or roughness. The brake control device includes a traveling environment estimation unit that estimates a traveling environment from a behavior of a first wheel that is any one of a plurality of wheels provided in a vehicle, and a timing calculation unit that calculates a timing at which a second wheel different from the first wheel is affected by the traveling environment, based on a vehicle speed. The plurality of wheels includes any one wheel that is controlled as for braking based on an estimation result of the traveling environment estimation unit and a calculation result of the timing calculation unit.
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