Patents by Inventor Takuya Usui

Takuya Usui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240239312
    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.
    Type: Application
    Filed: April 26, 2022
    Publication date: July 18, 2024
    Applicant: Hitachi Astemo, Ltd.
    Inventors: Takahiro ITO, Takuya USUI, Daisuke GOTO
  • Publication number: 20240039451
    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.
    Type: Application
    Filed: December 3, 2021
    Publication date: February 1, 2024
    Inventors: Haruhiko FUJITA, Takuya USUI, Daisuke GOTO
  • Publication number: 20230105090
    Abstract: An electric brake apparatus includes an electric motor including a plurality of driving circuits, an electric mechanism configured to press a braking member against a braking target member based on driving of the electric motor, and a control device configured to control the driving of the electric motor. The control device detects contact between the braking member and the braking target member based on a change in a current of the electric motor when power is supplied to a part of the driving circuits among the plurality of driving circuits. More specifically, the change amount of the current between before and after the braking member and the braking target member contact each other is larger when power is supplied to a part of the driving circuit than when power is supplied to all of the plurality of driving circuits.
    Type: Application
    Filed: March 19, 2021
    Publication date: April 6, 2023
    Inventors: Daichi NOMURA, Takuya USUI
  • Publication number: 20230070909
    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.
    Type: Application
    Filed: January 29, 2021
    Publication date: March 9, 2023
    Inventors: Koki TAKIMOTO, Daisuke GOTO, Takuya USUI
  • Publication number: 20230044286
    Abstract: A disk brake includes a brake mechanism configured to apply a braking force by advancing a piston in a cylinder portion based on driving of an electric motor to thus press inner and outer brake pads against a disk rotor, and an elastic member configured to bias the inner and outer brake pads in an axial direction of the disk rotor and in a direction away from the disk rotor. A biasing force of the elastic member is greater than sliding resistance of the piston on the cylinder portion. Due to this configuration, the disk brake can effectively prevent or reduce the drags of the inner and outer brake pads.
    Type: Application
    Filed: December 10, 2020
    Publication date: February 9, 2023
    Inventors: Hao YU, Takuya USUI
  • Publication number: 20230028403
    Abstract: The object of the present invention is to find out a component which improves effects of agriculturally active ingredients, which is effective to contribute to reduction of the environmental load even in a small amount, in addition to bringing benefits to the health and/or growth of useful plants, by maximizing the effects of nicosulfuron, reducing phytotoxicity which is an undesired effect on the useful plants, etc. When nicosulfuron and isoxadifen-ethyl are used in combination, by adding a specific surfactant, benefits can be brought to the health and/or growth of useful plants even if the addition amount is remarkably smaller than the amount of the conventional adjuvant used.
    Type: Application
    Filed: December 11, 2020
    Publication date: January 26, 2023
    Applicant: ISHIHARA SANGYO KAISHA, LTD.
    Inventors: Taketo SUGANUMA, Yasutsune TANIDA, Takuya USUI
  • Publication number: 20220396251
    Abstract: Provided is an electric brake device including one caliper including at least two electric mechanisms each configured to apply a braking force to a vehicle and to maintain the braking force. The at least two electric mechanisms are to be driven by one drive circuit output, that is, one output from one drive circuit. In this manner, for example, even when it is required to control a large number of electric mechanisms as in a case in which the electric brake device is applied to a twin-bore caliper, the number of drive circuits for driving the electric mechanisms can be reduced, thereby being capable of reducing cost.
    Type: Application
    Filed: June 22, 2020
    Publication date: December 15, 2022
    Inventors: Daichi NOMURA, Takuya USUI
  • Patent number: 11453374
    Abstract: To provide a disc brake having a planetary gear reduction mechanism that may be satisfactory costly and achieve improved reliability, a planetary gear reduction mechanism of a disc brake according to the present disclosure includes a sun gear having an input gear portion to which rotation from a motor is transmitted and an output gear portion extending axially from a radial central region of the input gear portion, a plurality of planetary gears configured to mesh with the output gear portion of the sun gear, and an internal gear configured to mesh with each planetary gear, and the internal gear has a cylindrical support portion configured to rotatably support the sun gear. Accordingly, at the time of assembly, the axis of the sun gear and the axis of the internal gear may be arranged substantially concentrically, which may result in improved reliability and cost satisfaction.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: September 27, 2022
    Assignee: HITACHI ASTEMO, LTD.
    Inventors: Takashi Mitsugi, Daisuke Hibi, Takayasu Sakashita, Jun Watanabe, Rikiya Yoshizu, Atsushi Odaira, Takuya Usui
  • Publication number: 20210039620
    Abstract: To provide a disc brake having a planetary gear reduction mechanism that may be satisfactory costly and achieve improved reliability, a planetary gear reduction mechanism of a disc brake according to the present disclosure includes a sun gear having an input gear portion to which rotation from a motor is transmitted and an output gear portion extending axially from a radial central region of the input gear portion, a plurality of planetary gears configured to mesh with the output gear portion of the sun gear, and an internal gear configured to mesh with each planetary gear, and the internal gear has a cylindrical support portion configured to rotatably support the sun gear. Accordingly, at the time of assembly, the axis of the sun gear and the axis of the internal gear may be arranged substantially concentrically, which may result in improved reliability and cost satisfaction.
    Type: Application
    Filed: March 27, 2019
    Publication date: February 11, 2021
    Inventors: Takashi MITSUGI, Daisuke HIBI, Takayasu SAKASHITA, Jun WATANABE, Rikiya YOSHIZU, Atsushi ODAIRA, Takuya USUI
  • Patent number: 10850718
    Abstract: An electric brake apparatus includes an electronic control unit (ECU) configured to move a power piston to cause a braking hydraulic pressure to be generated in a master cylinder by controlling an electric motor of an electric actuator based on an operation on a brake pedal (an input member position). A characteristic update processing portion of the ECU is configured to update, based on an operation amount of the brake pedal, characteristic data indicating a relationship between a hydraulic value transmitted from the ECU via a vehicle data bus and a movement amount of the power piston controlled based on the input member position, and store the updated characteristic data. The ECU is configured to control the electric actuator based on the updated characteristic data when an automatic brake instruction is input.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: December 1, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Daisuke Goto, Takuya Usui
  • Publication number: 20200276964
    Abstract: A brake operation sensor detects a position of an input member. An angle sensor detects a position of a power piston. An ECU drives and controls an electric motor based on a relative position between the input member and the power piston. Then, the input member and the power piston are subjected to a mechanical limitation on a relative displacement therebetween due to abutment with each other at a step. The ECU advances/retracts the power piston independently of the movement of the input member, and determines the abutment state between the input member and the power piston under the mechanical limitation based on the detected relative position. Then, the ECU corrects the relative position between the input member and the power piston based on this determination to control the electric motor.
    Type: Application
    Filed: September 18, 2018
    Publication date: September 3, 2020
    Inventors: Daisuke GOTO, Takuya USUI
  • Publication number: 20190315322
    Abstract: Provided is an electric brake apparatus capable of accurately generating a desired braking hydraulic pressure. An ECU moves a power piston to cause a braking hydraulic pressure to be generated in a master cylinder by controlling an electric motor 37 of an electric actuator based on an operation on a brake pedal (an input member position). A characteristic correction processing portion of the ECU corrects, based on an operation amount of the brake pedal, characteristic data indicating a relationship between a hydraulic value transmitted from an ECU via a vehicle data bus and a movement amount of the power piston controlled based on the input member position, and stores it. The ECU controls the electric actuator based on the corrected characteristic data when an automatic brake instruction is input.
    Type: Application
    Filed: May 26, 2017
    Publication date: October 17, 2019
    Inventors: Daisuke GOTO, Takuya USUI
  • Patent number: 10005441
    Abstract: An electric motor is controlled according to the back and forth movement of an input rod, which is caused by brake pedal operation; a primary piston is propelled to generate hydraulic brake pressure in a master cylinder; and the hydraulic brake pressure is fed back to the input rod through an input piston. The input piston is resiliently held by springs with respect to the primary piston. A jump-in clearance is created between the input piston and the input rod by a rearward spring. At the initial stage of braking, hydraulic brake pressure is not transmitted to the input rod due to the jump-in clearance, which provides jump-in characteristics. The jump-in clearance can be set, regardless of the amount of a relative displacement between the primary piston and the input piston, so that the range of adjustment for regenerative braking can be set larger than the jump-in clearance.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: June 26, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Kunihiro Matsunaga, Mitsuhiro Endo, Satohiro Koi, Naoki Shirakawa, Atsushi Odaira, Takuya Usui, Hiroshi Shigeta
  • Publication number: 20160068146
    Abstract: An electric motor is controlled according to the back and forth movement of an input rod, which is caused by brake pedal operation; a primary piston is propelled to generate hydraulic brake pressure in a master cylinder; and the hydraulic brake pressure is fed back to the input rod through an input piston. The input piston is resiliency held by springs with respect to the primary piston. A jump-in clearance is created between the input piston and the input rod by a rearward spring. At the initial stage of braking, hydraulic brake pressure is not transmitted to the input rod due to the jump-in clearance, which provides jump-in characteristics. The jump-in clearance can be set, regardless of the amount of a relative displacement between the primary piston and the input piston, so that the range of adjustment for regenerative braking can be set larger than the jump-in clearance.
    Type: Application
    Filed: March 31, 2014
    Publication date: March 10, 2016
    Inventors: Kunihiro MATSUNAGA, Mitsuhiro ENDO, Satohiro KOI, Naoki SHIRAKAWA, Atsushi ODAIRA, Takuya USUI, Hiroshi SHIGETA
  • Publication number: 20160016569
    Abstract: The present invention controls an electric motor according to a stroke that an input rod performs in response to an operation performed on a brake pedal, and thrusts a primary piston, thereby generating a brake hydraulic pressure in a master cylinder. The brake hydraulic pressure is fed back to the input rod via an input piston and an input plunger. The present invention applies a sliding resistance against the stroke of the input rod by pressing a frictional member of a resistance force applying mechanism against a tapering sliding portion of the input rod with the aid of a spring force of a spring member. A taper angle of the sliding portion allows the sliding resistance to change at a varying ratio according to a position of the input rod, which can lead to stable application of a desired sliding resistance.
    Type: Application
    Filed: July 13, 2015
    Publication date: January 21, 2016
    Inventors: Atsushi ODAIRA, Takuya USUI
  • Patent number: 9180852
    Abstract: An electric booster includes a housing having one end including a coupling surface where the housing is coupled to a master cylinder, and the other end including an attachment surface where the housing is attached to a vehicle. A controller includes a flat plate-like control board, and the control board is disposed so as to be positioned between a first plane including the attachment surface of the housing where the housing is attached to the vehicle, and a second plane including the coupling surface of the housing where the housing is coupled to the master cylinder.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: November 10, 2015
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Daichi Nomura, Takuya Usui, Toshiyuki Ajima, Hidefumi Iwaki, Kazuhiko Nakano, Hirohumi Watanabe
  • Patent number: 9108609
    Abstract: In normal braking, the operation of an electric motor is controlled according to the amount of operation of a brake pedal to drive a pressing member through a belt drive mechanism and a ball-screw mechanism, thereby pressing a piston to generate a fluid pressure in a master cylinder to obtain a braking force. A predetermined reaction force is applied to the brake pedal by a reaction force spring of a stroke simulator, and a gap is maintained between the pressing member and a movable member, thereby eliminating an uncomfortable feeling in a brake operation caused by fluid pressure variations in the master cylinder. When the electric motor fails, the movable member abuts against the pressing member and directly presses the piston to maintain the braking function. The rear end of the pressing member is inserted into a guide member and the reaction force spring to reduce the axial size.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: August 18, 2015
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Takuya Usui
  • Patent number: 8833526
    Abstract: An electric brake apparatus compares an estimated thrust force corresponding to a predetermined rotational position of an electric motor, which is calculated from an electric current/thrust force conversion function, with a reference thrust force based on a rotational position/thrust force table indicating a relationship between the rotational position of the electric motor and a thrust force of a piston to correct and update the electric current/thrust force conversion function, thereby maintaining a predetermined control accuracy despite wear of a brake pad and other changes over time.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: September 16, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Daisuke Goto, Hirotaka Oikawa, Takuya Usui
  • Patent number: 8770353
    Abstract: A ball-and-ramp mechanism of a thrust generator includes a rotary ramp member and a rectilinear ramp member, each having a plurality of sloped grooves sloped along a circumferential direction and having an arcuate diametrical cross-section, and a spherical member interposed between the sloped grooves of the ramp members to transmit force from the rotary ramp member to the rectilinear ramp member. Each of the sloped grooves has regions varying in the curvature radius of the diametrical cross-section in a track area where the spherical member contacts the sloped groove. Accordingly, it is possible to improve the durability of the rotary ramp member and the rectilinear ramp member.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: July 8, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takuya Usui, Takayasu Sakashita, Atsushi Odaira
  • Publication number: 20140090371
    Abstract: An electric motor is controlled according to an operation of a brake pedal connected to an input rod to drive a ball-screw mechanism through a transmission mechanism, thereby propelling a primary piston and a subpiston to generate brake hydraulic pressure in a master cylinder. The brake hydraulic pressure in the master cylinder is received with an input piston and transmitted to the brake pedal through a plunger rod and the input rod. The input rod and the plunger rod are tiltably connected, through a ball joint, and the plunger rod is axially slidably guided by a guide part of a rear cover. Thus, a lateral force acting on the primary piston or the subpiston is reduced to prevent an increase in sliding resistance and degradation of sealing performance.
    Type: Application
    Filed: September 23, 2013
    Publication date: April 3, 2014
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Rikiya YOSHIZU, Takuya USUI, Atsushi ODAIRA