Patents by Inventor Yasumichi Wakao

Yasumichi Wakao 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: 20220266702
    Abstract: A wireless power receiving system includes: a power receiving device having a power receiving coil configured to receive electric power supplied wirelessly from a power transmission coil of a power transmission device installed on a road surface, at least part of the power receiving coil being contained in a vehicle wheel; and in-vehicle devices installed in a mobile object, the in-vehicle devices being energizably connected to the power receiving device. The power receiving device transmits the received electric power to the in-vehicle devices.
    Type: Application
    Filed: July 22, 2020
    Publication date: August 25, 2022
    Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.
    Inventors: Hiroshi FUJIMOTO, Takehiro IMURA, Osamu SHIMIZU, Katsuhiro HATA, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
  • Patent number: 11415485
    Abstract: A tire state detection device that includes: a temperature sensor that detects a temperature in a tire air chamber; an acceleration sensor that detects acceleration associated with rotation of a tire; a pressure sensor that detects pressure in the tire air chamber; a storage unit that stores a plurality of maps for calculating a fatigue state of the tire on the basis of the detected temperature, the detected acceleration and the detected pressure; and a tire fatigue index calculation unit that calculates, by referring to each of the plurality of maps, a tire fatigue index from the detected acceleration, the detected temperature, and the detected pressure.
    Type: Grant
    Filed: December 8, 2018
    Date of Patent: August 16, 2022
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yasumichi Wakao
  • Publication number: 20220250419
    Abstract: A non-pneumatic tire has an inner annular body centered on a rotation axis portion, an outer annular body provided radially outward of the inner annular body, a wheel portion including a connecting member elastically deforming and for connecting the inner annular body and the outer annular body, and a tread portion provided radially outward of the outer annular body and in contact with a road. The non-pneumatic tire is provided with an electrode portion which is in contact with the tread portion and is provided on the radially inner side of tread portion, and a wiring portion which connects the electrode portion and the inner annular body and is formed of a conductor. A part of the wheel portion is formed of a nonmetallic material, and the electrode portion is formed of a conductor having a prescribed width in tire width direction and a prescribed length in tire circumferential direction.
    Type: Application
    Filed: June 10, 2020
    Publication date: August 11, 2022
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasumichi WAKAO, Masashi NISHIDA
  • Publication number: 20220063415
    Abstract: The carcass of the pneumatic tire includes a plurality of carcass cords formed of conductors and arranged along the tire radial direction and the tire width direction, and a circumferential cord formed of conductors and arranged along the tire circumferential direction. The circumferential cord contacts the carcass cord.
    Type: Application
    Filed: December 17, 2019
    Publication date: March 3, 2022
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasumichi WAKAO, Masaaki NAKAMURA, Takahisa SHIZUKU
  • Patent number: 11176408
    Abstract: A method which includes obtaining a plurality of images of tires that differ from one another in either one of or both of a tire type and a tire condition, the obtained images being regarded as teacher images; converting the teacher images into a size of a predetermined number of pixels; learning by a convolutional neural network using data of the plurality of converted teacher images as learning images, and setting parameters of the convolutional neural network; obtaining a tire image of a recognition-target tire and converting the obtained tire image into a size identical to that of the teacher images; and inputting the converted tire image of the recognition-target tire to the convolutional neural network and determining either one of or both of the type and the condition of the recognition-target tire.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: November 16, 2021
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Masayuki Nishii, Yasuo Oosawa, Yasumichi Wakao
  • Publication number: 20210164868
    Abstract: A tire state detection device that includes: a temperature sensor that detects a temperature in a tire air chamber; an acceleration sensor that detects acceleration associated with rotation of a tire; a pressure sensor that detects pressure in the tire air chamber; a storage unit that stores a plurality of maps for calculating a fatigue state of the tire on the basis of the detected temperature, the detected acceleration and the detected pressure; and a tire fatigue index calculation unit that calculates, by referring to each of the plurality of maps, a tire fatigue index from the detected acceleration, the detected temperature, and the detected pressure.
    Type: Application
    Filed: December 8, 2018
    Publication date: June 3, 2021
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Yasumichi WAKAO
  • Publication number: 20200251974
    Abstract: A power generating device capable of improving efficiency of power generation by rotation of a tire and a tire equipped with the power generating device are provided. The power generating device, which is to be mounted on an interior surface of the tire, includes an oscillator that oscillates by rotation of the tire during vehicular travel to produce electromotive force. A resonance frequency of the oscillator is matched to a frequency corresponding to a change in acceleration at the interior surface of the tire during one revolution of the tire rotating at a constant speed.
    Type: Application
    Filed: November 21, 2016
    Publication date: August 6, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Go NAGAYA, Yasumichi WAKAO
  • Publication number: 20200125887
    Abstract: A method which includes obtaining a plurality of images of tires that differ from one another in either one of or both of a tire type and a tire condition, the obtained images being regarded as teacher images; converting the teacher images into a size of a predetermined number of pixels; learning by a convolutional neural network using data of the plurality of converted teacher images as learning images, and setting parameters of the convolutional neural network; obtaining a tire image of a recognition-target tire and converting the obtained tire image into a size identical to that of the teacher images; and inputting the converted tire image of the recognition-target tire to the convolutional neural network and determining either one of or both of the type and the condition of the recognition-target tire.
    Type: Application
    Filed: August 7, 2018
    Publication date: April 23, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Masayuki NISHII, Yasuo OOSAWA, Yasumichi WAKAO
  • Publication number: 20200031178
    Abstract: A fitting structure between a functional component accommodation case and a rubber base, the functional component accommodation case being configured to accommodate a functional component that detects a state of a tire, and the rubber base being configured to be attached to an inner surface of the tire so as to mount the functional component accommodation case. The fitting structure includes plural case-side convex/concave parts that are formed on a case bottom surface which is a surface on a tire inner surface side of the functional component accommodation case and that extend in mutually intersecting directions, and plural base-side convex/concave parts that are formed on a functional component accommodation case side of a base bottom part, which is an attachment part to be attached to the tire, of the rubber base and that fit with the case-side convex/concave parts.
    Type: Application
    Filed: April 12, 2018
    Publication date: January 30, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Keita ISHII, Yasumichi WAKAO, Satoru KAWAMATA
  • Patent number: 10352827
    Abstract: A tire contact state estimation method includes: an information acquisition step of acquiring information of the tire; a correlation strength calculation step of calculating a first correlation strength between the rotational velocity and the braking and driving force, and also calculating a second correlation strength between the slip angle and the generated lateral force; a change detection step of detecting whether the first correlation strength has increased or decreased by a first threshold or more with respect to a predetermined first reference value, and also detecting whether the second correlation strength has increased or decreased by a second threshold or more with respect to a predetermined second reference value; and an estimation step of estimating at least two of the following: a condition of a road surface in contact with the tire, a tire internal pressure state, and a tire abrasion state.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: July 16, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Hiroshi Kato, Takahisa Kamikura, Ryo Sakurai, Yasushi Hanatsuka, Yasumichi Wakao
  • Patent number: 10227743
    Abstract: The invention provides an apparatus, program, and method for controlling the automatic spraying of an antifreezing agent that can reduce the cost of the antifreezing agent and the impact of salt damages caused by the antifreezing agent. This is accomplished by reducing the amount of antifreezing agent to be sprayed automatically according to road surface condition and reducing the amount of the antifreezing agent left unused on completion of the spray operation by grasping in advance the total spray amount of the antifreezing agent.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: March 12, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kazuma Nakazawa, Yasumichi Wakao, Go Nagaya, Shinya Tsuchida, Yasushi Hanatsuka, Hiroshi Morinaga, Tomonori Ohiro
  • Patent number: 10112444
    Abstract: A wear amount detection device to detect that a tire is in a worn state, during running, without a special sensor. The device includes a rotation sensor detecting rotation of a wheel to measure a speed of an automobile; a signal processing extracting rotation speed fluctuations synchronized with rotation, from a rotation signal detected by the rotation sensor, and obtain a rotation speed fluctuation pattern synchronized with rotation, from rotation speed fluctuations over a plurality of rotations; and a wear state determination configured to obtain, from the obtained pattern, a value of a component induced by a characteristic embodied in a tire of the wheel, the value varying in accordance with a wear state of the tire, to estimate a wear state of the tire, and to output the state.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: October 30, 2018
    Assignee: NTN CORPORATION
    Inventors: Toru Takahashi, Kentaro Nishikawa, Nobuo Masaki, Yasumichi Wakao
  • Publication number: 20170241778
    Abstract: The invention provides a method for accurately predicting a road surface condition at a location within a predetermined range. To that end, the road surface conditions at the location within the predetermined range are predicted using road surface estimation decision values calculated using vehicular information, which is the information on the behavior of a vehicle Wi during travel obtained by an on-board sensor mounted on the vehicle, or estimated road surface conditions estimated using the road surface estimation decision values. In doing so, the road surface condition at the location within the predetermined range is predicted based on the road surface estimation decision values calculated for the location within the predetermined range or the time-dependent changes in the estimated road surface conditions.
    Type: Application
    Filed: October 14, 2015
    Publication date: August 24, 2017
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasushi HANATSUKA, Kazuma NAKAZAWA, Yasumichi WAKAO
  • Publication number: 20160281312
    Abstract: The invention provides an apparatus, program, and method for controlling the automatic spraying of an antifreezing agent that can reduce the cost of the antifreezing agent and the impact of salt damages caused by the antifreezing agent. This is accomplished by reducing the amount of antifreezing agent to be sprayed automatically according to road surface condition and reducing the amount of the antifreezing agent left unused on completion of the spray operation by grasping in advance the total spray amount of the antifreezing agent.
    Type: Application
    Filed: November 6, 2014
    Publication date: September 29, 2016
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Kazuma NAKAZAWA, Yasumichi WAKAO, Go NAGAYA, Shinya TSUCHIDA, Yasushi HANATSUKA, Hiroshi MORINAGA, Tomonori OHIRO
  • Publication number: 20160250899
    Abstract: Provided is a wear amount detection device that is able to detect that a tire is in a worn state, during running, without a special sensor while suppressing an increase in cost. The device includes: a rotation sensor (2) detecting rotation of a wheel (1) to measure a speed of an automobile; a signal processing (3) extracting rotation speed fluctuations synchronized with rotation, from a rotation signal detected by the rotation sensor, and obtain a rotation speed fluctuation pattern synchronized with rotation, from rotation speed fluctuations over a plurality of rotations; and a wear state determination (4) configured to: obtain, from the obtained pattern, a value of a component induced by a characteristic embodied in a tire (1a) of the wheel (1), the value varying in accordance with a wear state of the tire (1a); estimate a wear state of the tire (1a); and output the state.
    Type: Application
    Filed: May 10, 2016
    Publication date: September 1, 2016
    Applicant: NTN CORPORATION
    Inventors: Toru TAKAHASHI, Kentaro NISHIKAWA, Nobuo MASAKI, Yasumichi WAKAO
  • Publication number: 20160109331
    Abstract: A tire contact state estimation method includes: an information acquisition step of acquiring information of the tire; a correlation strength calculation step of calculating a first correlation strength between the rotational velocity and the braking and driving force, and also calculating a second correlation strength between the slip angle and the generated lateral force; a change detection step of detecting whether the first correlation strength has increased or decreased by a first threshold or more with respect to a predetermined first reference value, and also detecting whether the second correlation strength has increased or decreased by a second threshold or more with respect to a predetermined second reference value; and an estimation step of estimating at least two of the following: a condition of a road surface in contact with the tire, a tire internal pressure state, and a tire abrasion state.
    Type: Application
    Filed: May 12, 2014
    Publication date: April 21, 2016
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hiroshi KATO, Takahisa KAMIKURA, Ryo SAKURAI, Yasushi HANATSUKA, Yasumichi WAKAO
  • Patent number: 9170102
    Abstract: A method capable of estimating a snowy road surface condition during vehicular travel in finer classification. In this method, tire vibrations in the circumferential direction, road surface temperature (T), and tire-generated sound are detected by an acceleration sensor, a road surface thermometer, and a microphone, respectively. Then band values P11, P12 and P13 for a pre-leading-edge region (R1), band values P21, P22 and P23 for a leading-edge region (R2), band values P31, P32 and P33 for a pre-trailing-edge region (R3), band values P41 and P42 for a trailing-edge region (R4), and band values P51, P52 and P53 for a post-trailing-edge region (R5) are calculated from the tire vibration data. A sound pressure level ratio (Q)=(PA/PB), which is the ratio of a band power value (PA) of a low frequency band to a band power value (PB) of a high frequency band, is calculated from data on the tire-generated sound.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: October 27, 2015
    Assignee: Kabushiki Kaisha Bridgestone
    Inventors: Yasushi Hanatsuka, Yasumichi Wakao, Hiroshi Morinaga
  • Patent number: 9045117
    Abstract: The condition of a road surface on which a vehicle is traveling is estimated accurately, using a tire having a general variable-pitch tire pattern for detection of a road surface condition. The tire for detection of a road surface condition has rows of blocks, the total number N of the circumferentially disposed blocks being 10 or more and the number n of lug grooves, each provided with a joining section connecting circumferentially adjacent blocks, being in the range of (N/2)?n?(N?5). The vibrations of the tire are detected by an acceleration sensor and are subjected to a rotational order ratio analysis by a rotational order ratio analyzing unit. And the road surface condition is estimated by comparing the amplitude P of the rotational order component of the tire vibrations extracted by a rotational order component extracting unit with a predetermined threshold value K.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: June 2, 2015
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yasumichi Wakao
  • Patent number: 8942861
    Abstract: The invention provides a method and apparatus capable of accurately estimating a road surface condition under a traveling vehicle using unsprung acceleration and wheel speed data. The unsprung fore-aft acceleration (Gx) is detected by an acceleration sensor (11) attached to a knuckle (31) which is an unsprung component of a vehicle. At the same time, the wheel speed (Vw) is detected and the variation (?Vw) in wheel speed is calculated. Then the fluctuation range (?(?Vw)) of the variation in wheel speed and the fluctuation range (?(Gx)) of the unsprung fore-aft acceleration are calculated. And whether the road surface is a rough road surface with some bumpiness or a flat (smooth) road surface is estimated from a relationship between the fluctuation range (?(?Vw)) of the variation in wheel speed and the fluctuation range (?(Gx)) of the unsprung fore-aft acceleration.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: January 27, 2015
    Assignee: Bridgestone Corporation
    Inventor: Yasumichi Wakao
  • Patent number: 8869618
    Abstract: A simple method and apparatus for accurately estimating the contact patch shape of a moving tire. The vibration waveforms of a tire (20) with sipe rows (25A, 25B) formed at the respective pitches (Pa, Pb) in the left and right shoulder lands (24a, 24b) are detected by an acceleration sensor attached to a knuckle of the vehicle. Rotational order spectrums are obtained by performing a rotational order analysis on the vibration waveforms. The peak height (Za) of the rotational order (na) corresponding to the pitch (Pa) and the peak height (Zb) of the rotational order (nb) corresponding to the pitch (Pb) are extracted from the rotational order spectrums.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: October 28, 2014
    Assignee: Kabushiki Kaisha Bridgestone
    Inventor: Yasumichi Wakao