Patents by Inventor Yasuo Shimizu

Yasuo Shimizu 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).

  • Patent number: 9308935
    Abstract: Provided is an electric power steering apparatus capable of performing steering of a steering wheel with a comfortable steering feeling while stabilizing a vehicle behavior even in a vicinity of a steering neutral position. A first electric power steering apparatus includes a steering torque sensor for detecting a steering torque inputted by a driver, a steering angle sensor for detecting a steering angle of a steering wheel, a steering assist motor for applying a steering assist force to the steering wheel, and a drive control unit for performing drive control of the steering assist motor based on the steering torque and the steering angle. The drive control unit performs drive control of the steering assist motor based on the steering angle detected by the steering angle sensor and hysteresis characteristics related to a steering reaction force associated with a change of the steering angle.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: April 12, 2016
    Assignee: Honda Motor Co., Ltd.
    Inventors: Satoshi Ohno, Yoshihiro Oniwa, Atsuhiko Yoneda, Yasuo Shimizu
  • Publication number: 20160061865
    Abstract: A structure of mounting a current sensor to a battery cable includes a battery cable, a thermal fusion bonding tape wound around an outer circumference of the battery cable, and a current sensor. The current sensor includes a housing including a current detecting part configured to detect a current flowing through the battery cable, and a holder configured to hold and compress a thermal fusion bonding tape mounting portion in cooperation with the housing to deform a cross-sectional shape of the thermal fusion bonding tape mounting portion into an elliptical shape. The thermal fusion bonding tape mounting portion is a portion where the thermal fusion bonding tape is wound around the battery cable. Upon a compression between the housing and the holder being released, the elliptical shape of the cross-sectional shape of the thermal fusion bonding tape mounting portion is maintained.
    Type: Application
    Filed: November 6, 2015
    Publication date: March 3, 2016
    Inventors: Yasuhiro SUGIMORI, Kunihiro HARADA, Yasuo SHIMIZU
  • Publication number: 20150360715
    Abstract: The steering device includes first and second motors for steering which have common electric characteristics; first and second current sensors detecting first and second current values in the first and second motor, respectively; and abnormality diagnosis units. The abnormality diagnosis units make an abnormality diagnosis indicating that the steering device is abnormal when difference between the first and second current values exceeds a predetermined threshold value. When some abnormality occurs in the current detecting units for detecting the magnitudes of a current flowing through the steering motor, an abnormality diagnosis is rapidly made by comparing the difference with the predetermined value.
    Type: Application
    Filed: December 26, 2013
    Publication date: December 17, 2015
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Yasuo SHIMIZU, Manabu IKEGAYA, Atsuhiko YONEDA, Takashi MIYOSHI, Yoshihiro ONIWA
  • Patent number: 9194757
    Abstract: A magnetostrictive torque sensor includes first to fourth detection coils each wound around a steering axle (a sensor shaft) so as to surround a magnetostrictive film formed on the sensor shaft and a multi-turn winding bias coil that is separated from the first to fourth detection coils and that is wound around the sensor shaft so as to surround the magnetostrictive film. By applying a DC component current to the bias coil, a sufficient bias magnetic field is applied to the magnetostrictive film so that the hysteresis is prevented.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: November 24, 2015
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Atsuhiko Yoneda, Yasuo Shimizu, Kouichi Fujita
  • Publication number: 20150274204
    Abstract: A power steering apparatus for a vehicle includes a column shaft, a column pipe rotatably supporting the column shaft through a plurality of bearings, and a torque sensor for detecting torque generated on the column shaft by using magnetism. The column pipe is composed of a steel pipe. The torque sensor includes a magnetically variable portion and a magnetic change detector. The magnetically variable portion is disposed on the column shaft and has a magnetic permeability that varies with the torque generated on the column shaft. The magnetic change detector is configured to detect a change in the magnetism of the magnetically variable portion. The magnetic change detector is attached to the column pipe by being inserted in an axial direction through an opening at an axial end of the column pipe.
    Type: Application
    Filed: March 31, 2015
    Publication date: October 1, 2015
    Applicant: HONDA MOTOR CO., LTD
    Inventors: Takehito Shiraishi, Yutaka Arimura, Takashi Miyoshi, Yasuo Shimizu
  • Publication number: 20150144418
    Abstract: Provided is an electric power steering apparatus capable of performing steering of a steering wheel with a comfortable steering feeling while stabilizing a vehicle behavior even in a vicinity of a steering neutral position. A first electric power steering apparatus includes a steering torque sensor for detecting a steering torque inputted by a driver, a steering angle sensor for detecting a steering angle of a steering wheel, a steering assist motor for applying a steering assist force to the steering wheel, and a drive control unit for performing drive control of the steering assist motor based on the steering torque and the steering angle. The drive control unit performs drive control of the steering assist motor based on the steering angle detected by the steering angle sensor and hysteresis characteristics related to a steering reaction force associated with a change of the steering angle.
    Type: Application
    Filed: November 25, 2014
    Publication date: May 28, 2015
    Inventors: Satoshi OHNO, Yoshihiro ONIWA, Atsuhiko YONEDA, Yasuo SHIMIZU
  • Patent number: 8924080
    Abstract: Provided is an electric power steering device in which the operation feeling is improved without a decrease in commercial value. A phase compensation unit performs a frequency shift on a compensation frequency band compensated by the phase compensation unit. The phase compensation unit performs phase-shift in the compensation frequency band through a frequency shift process, instead of an increase in compensation gain. Therefore, it is possible to minimize occurrences of minute vibrations and abnormal noise in the steering system including the motor that accompany an increase in gain, and to improve the operation feeling and commercial value.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: December 30, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Atsuhiko Yoneda
  • Publication number: 20140339077
    Abstract: Disclosed is a plating device that has a plating tank that retains a plating fluid and carries out magnetic metal plating on a shaft shaped member immersed in the plating fluid as a negative electrode. The plating device is provided with: a plurality of shielding jigs that are fitted to the outer peripheral surface of the shaft shaped member and regulate the part of the shaft shaped member being plated; and a positive electrode provided in the vicinity of the shaft shaped member and having an output part that faces the part being plated. A center position in the axial direction of the shaft shaped member for the part being plated and a center position of the output part are aligned within a prescribed allowable value for the center positions.
    Type: Application
    Filed: December 21, 2012
    Publication date: November 20, 2014
    Inventors: Yutaka Arimura, Yasuo Shimizu, Atsuhiko Yoneda
  • Publication number: 20140331802
    Abstract: A worm gear mechanism (44) comprises a worm (70) and a worm wheel (80) meshed with the worm. In the teeth of a hob (90) used for the gear cutting of the worm wheel, at least the addendum surfaces (91c) are formed into arcuate shapes. The radial centers (93) of the arcs of the addendum surfaces are positioned nearer to a center line (WL?) of the hob than a pitch line (94) of the hob. The worm wheel is cut into a gear by the hob. The worm is formed into the same shape as the hob. The recess meshing length (L) of the worm gear mechanism is designed to be greater than the recess meshing length (Llim) of a conventional worm gear mechanism.
    Type: Application
    Filed: December 3, 2012
    Publication date: November 13, 2014
    Inventors: Yosuke Tanaka, Yasuo Shimizu
  • Publication number: 20140326077
    Abstract: A magnetostrictive torque sensor includes first to fourth detection coils each wound around a steering axle (a sensor shaft) so as to surround a magnetostrictive film formed on the sensor shaft and a multi-turn winding bias coil that is separated from the first to fourth detection coils and that is wound around the sensor shaft so as to surround the magnetostrictive film. By applying a DC component current to the bias coil, a sufficient bias magnetic field is applied to the magnetostrictive film so that the hysteresis is prevented.
    Type: Application
    Filed: April 28, 2014
    Publication date: November 6, 2014
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Atsuhiko Yoneda, Yasuo Shimizu, Kouichi Fujita
  • Publication number: 20140318289
    Abstract: A worm gear mechanism includes a worm connected to an electric motor, and a worm wheel engaged with the worm. In the worm wheel, a tooth flank is formed of a resin material. In the tooth flank, an engagement recess, which is based on a trajectory of a contact point being in contact with a tooth of the worm according to a rotation of the worm, is formed by injection molding, together with the tooth flank, using a mold. The engagement recess includes a plurality of points which are recessed in the direction of a tooth of the tooth flank correspondingly to the trajectory of the contact point with which the most convex portion of the tooth of the worm is in contact. A line connecting the plurality of points interconnects with respect to a tooth width center line of the tooth flank of the worm wheel.
    Type: Application
    Filed: October 5, 2012
    Publication date: October 30, 2014
    Inventors: Yosuke Tanaka, Yasuo Shimizu
  • Patent number: 8807260
    Abstract: A magnetostrictive torque sensor includes a magnetostrictive portion formed on a rotational shaft, a bobbin surrounding an outer circumference of the magnetostrictive portion, and a coil wound on the bobbin for detecting a change in magnetic property of the magnetostrictive portion. The bobbin fits over the magnetostrictive portion in contact with the magnetostrictive portion in such a manner as to allow rotation of the magnetostrictive portion relative to the bobbin. The magnetostrictive torque sensor is carried on an electrically assisted bicycle or an electric power steering apparatus of a vehicle.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: August 19, 2014
    Assignee: Honda Motor Co. Ltd.
    Inventors: Yasuo Shimizu, Yutaka Arimura, Masahiro Kuroki, Kentaro Ikegami
  • Patent number: 8798862
    Abstract: An electric power steering device wherein mechanical friction is electrically provided. A steering torque value is detected by a steering torque sensor according to the operation of a steering wheel. An assist current value is calculated by an assist control section on the basis of the steering torque value. A target current value based on the assist current value is determined. For providing friction to the operation of the steering wheel, a friction control section and a friction torque value/current value conversion section generate a corrected steering torque value. A second corrected target current value is created by correcting a first corrected target current value by a friction current value. The corrected steering torque value is obtained by correcting the steering torque value by a friction torque value. The target current value is generated, resulting in a motor being subjected to driving control.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: August 5, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Shigeru Yamawaki, Kazushige Sugamata, Atsuhiko Yoneda
  • Publication number: 20140195122
    Abstract: Provided is an electric power steering device in which the operation feeling is improved without a decrease in commercial value. A phase compensation unit performs a frequency shift on a compensation frequency band compensated by the phase compensation unit. The phase compensation unit performs phase-shift in the compensation frequency band through a frequency shift process, instead of an increase in compensation gain. Therefore, it is possible to minimize occurrences of minute vibrations and abnormal noise in the steering system including the motor that accompany an increase in gain, and to improve the operation feeling and commercial value.
    Type: Application
    Filed: May 22, 2012
    Publication date: July 10, 2014
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Atsuhiko Yoneda
  • Patent number: 8701503
    Abstract: Disclosed are a magnetostrictive torque sensor and an electrical power steering device, wherein a first torque sensor has: one magnetostrictive film provided on a steering shaft; a first coil and a second coil that detect changes in the magnetic characteristics of the magnetostrictive film; and a first housing that contains, at least, the steering shaft, the magnetostrictive film, the first coil, and the second coil. The first housing has a resin part, a cylindrical part made of a metal that is soft magnetic, and a flange part made of a metal that is soft magnetic. The resin part, the cylindrical part, and the flange part are formed as a unit.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: April 22, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yasuo Shimizu, Atsuhiko Yoneda, Yutaka Arimura, Yoshihiro Oniwa
  • Patent number: 8688356
    Abstract: When the variation of the knock control system learning value is large, an idle speed learning control is performed in a learning acceleration mode. In this mode, the idle speed learning update increases and idle speed learning is performed at a high speed. By performing the idle speed learning in the learning acceleration mode, the idle speed learning can immediately follow large variations of the knock control system learning value. Accordingly, the idle speed learning control performed during idling of a hybrid car can be completed in a short time, and fuel consumption during idling can be reduced.
    Type: Grant
    Filed: November 13, 2006
    Date of Patent: April 1, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideto Watanabe, Taku Harada, Yasuo Shimizu
  • Publication number: 20140077631
    Abstract: In a vertical through hole of a rotational shaft, a first protrusion portion and a second protrusion portion protruding from an inner peripheral surface of the vertical through hole are provided in an axial direction of the though hole to form a storage area for storing oil, and discharge holes for directly discharging oil flowing over the first protrusion portion into the transaxle casing are provided in parallel with the cooling holes.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 20, 2014
    Applicants: AISIN AW CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masato WATANABE, Takeshi KANAYAMA, Yosuke KATO, Nobuhito MORI, Shinichiro SUENAGA, Takamasa TAKEUCHI, Norihiro MAE, Tomoo ATARASHI, Yasuo SHIMIZU
  • Patent number: 8670904
    Abstract: A motor control device includes: a rotation angle detection portion that detects a rotation angle of a motor and outputs a rotation angle signal; an abnormal condition detection portion that detects the presence or absence of an abnormal condition of the rotation angle detection portion; a rotation angle estimation portion that estimates the rotation angle of the motor and outputs an estimate rotation angle signal; and a driving control portion that controls driving of the motor on the basis of the rotation angle signal, which is output from the rotation angle detection portion, when the abnormal condition detection portion does not detect an abnormal condition of the rotation angle detection portion, and controls driving of the motor on the basis of the estimate rotation angle signal, which is output from the rotation angle estimation portion, when the abnormal condition detection portion detects an abnormal condition of the rotation angle detection portion.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: March 11, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Atsuhiko Yoneda, Yasuo Shimizu
  • Patent number: 8663906
    Abstract: The present invention provides a composition for forming a fine pattern with high dry etching resistance and a method for forming the fine pattern. The composition for fine pattern formation containing: a resin containing a repeating unit having a silazane bond; and a solvent as well as a method for fine pattern formation using the same.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: March 4, 2014
    Assignee: AZ Electronic Materials USA Corp.
    Inventors: Ralph R Dammel, Wen-Bing Kang, Yasuo Shimizu, Tomonori Ishikawa
  • Patent number: 8662509
    Abstract: A shock absorbing device for a rack and pinion type steering device includes a rack shaft, a rack housing, a stopper portion formed in an end part of the rack shaft, a stopper engaging portion provided on the rack housing to define a stroke end position for the rack shaft by engaging the stopper portion, a stepped portion formed on the rack shaft, a shoulder portion formed in an enlarged diameter portion of the rack housing, and a cylindrical elastic member fitted on the rack shaft such that the elastic member is pressed in the axial direction of the rack shaft by the stepped portion and the shoulder portion. The elastic member is formed with grooves on each of an outer circumferential surface and an inner circumferential surface thereof. Such shock absorbing device for a rack and pinion type steering device has a high shock absorbing capability.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: March 4, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takehito Shiraishi, Yasuo Shimizu, Takahiro Aoki