Patents by Inventor Hideki Doi

Hideki Doi 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: 11173951
    Abstract: Provided is an electric power steering device including a phase compensation unit having a desirable phase compensation characteristic for each vehicle speed region, which suppresses deterioration in stability of a steering system in a case where the phase compensation characteristic is changed to a different phase compensation characteristic, in which the phase compensation unit includes: a plurality of phase compensation calculation units configured to execute phase compensation calculation based on each phase compensation characteristic; a phase compensation characteristic determination unit configured to determine a phase compensation characteristic based on a vehicle speed signal output from a vehicle speed sensor; and a selection unit configured to select a phase-compensated torque signal output by the phase compensation unit from phase compensation calculation results output by the plurality of phase compensation calculation units in consideration of an amount of change in phase compensation calculatio
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: November 16, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasuaki Hori, Kenta Kawahara, Katsuya Ikemoto, Eiji Iwami, Hideki Doi
  • Publication number: 20200391786
    Abstract: Provided is an electric power steering device including a phase compensation unit having a desirable phase compensation characteristic for each vehicle speed region, which suppresses deterioration in stability of a steering system in a case where the phase compensation characteristic is changed to a different phase compensation characteristic, in which the phase compensation unit includes: a plurality of phase compensation calculation units configured to execute phase compensation calculation based on each phase compensation characteristic; a phase compensation characteristic determination unit configured to determine a phase compensation characteristic based on a vehicle speed signal output from a vehicle speed sensor; and a selection unit configured to select a phase-compensated torque signal output by the phase compensation unit from phase compensation calculation results output by the plurality of phase compensation calculation units in consideration of an amount of change in phase compensation calculatio
    Type: Application
    Filed: November 6, 2017
    Publication date: December 17, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasuaki HORI, Kenta KAWAHARA, Katsuya IKEMOTO, Eiji IWAMI, Hideki DOI
  • Patent number: 9242670
    Abstract: In a steering control device, a road surface reaction force torque calculation module (52) uses a vehicle speed, steering angle, and vehicle model to calculate a caster-trail-caused torque, a self-aligning torque, and a road surface reaction force torque. A reaction force command current calculation module (53) uses the road surface reaction force torque and the vehicle speed to calculate a reaction force command current.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: January 26, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaya Endo, Masahiko Kurishige, Takayuki Kifuku, Masaki Matsushita, Hideki Doi
  • Publication number: 20120296525
    Abstract: In a steering control device, a road surface reaction force torque calculation module (52) uses a vehicle speed, steering angle, and vehicle model to calculate a caster-trail-caused torque, a self-aligning torque, and a road surface reaction force torque. A reaction force command current calculation module (53) uses the road surface reaction force torque and the vehicle speed to calculate a reaction force command current.
    Type: Application
    Filed: February 19, 2010
    Publication date: November 22, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaya Endo, Masahiko Kurishige, Takayuki Kifuku, Masaki Matsushita, Hideki Doi
  • Patent number: 7611631
    Abstract: The invention provides an indium adsorbent that can cause indium to be adsorbed, and a simple and inexpensive indium fractioning method for isolating and recovering high-purity indium from an acid solution whose primary component is hydrochloric acid and that contains indium. A primary component of the indium adsorbent is an anion-exchange resin that has a crosslinked structure produced by the copolymerization of styrene or acrylamide and divinylbenzene, and at least one of a quaternary ammonium group and a tertiary ammonium group, and that is provided with an acid-adsorbing ability. An acid solution whose primary component is hydrochloric acid and that includes indium is brought into contact with the anion-exchange resin to cause indium to be adsorbed to the anion-exchange resin.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: November 3, 2009
    Assignees: Aquatech Corporation, Sharp Kabushiki Kaisha
    Inventors: Akifusai Ohnishi, Nobuaki Fujiwara, Hideki Doi, Toyokazu Matsunami, Hiroshi Tsubota, Toshiaki Muratani, Shoji Nishikawa, Shinichi Yamasaki, Takamichi Honma
  • Patent number: 7336456
    Abstract: An objective is to detect a resolver malfunction without fail, using a low-cost resolver having the small number of the poles, and a control-motor system having advantage in small sizing and high-power outputting. In the control-motor system, the system for driving a 2m-pole motor based on a rotor rotation angle ? detected by a 2n-pole resolver, where m and n being counting numbers, is characterized in that: the sum of the square of a signal modulated by sin ? and the square of a signal modulated by cos ? in the resolver in which an excitation signal generated in said system is modulated by sin ? and cos ? in response to the rotor rotation angle ? of the resolver is compared to a predetermined malfunction threshold value, so that malfunction determination related to the resolver is performed, and also, given that the sum is a2 when the resolver is recognized to be in normal operation, the malfunction determination threshold value is made to be not smaller than {a×cos((?/2)/(m/n))}2.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: February 26, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masaki Matsushita, Takayuki Kifuku, Hideki Doi, Katsuhiko Ohmae
  • Publication number: 20080038188
    Abstract: The invention provides an indium adsorbent that can cause indium to be adsorbed, and a simple and inexpensive indium fractioning method for isolating and recovering high-purity indium from an acid solution whose primary component is hydrochloric acid and that contains indium. A primary component of the indium adsorbent is an anion-exchange resin that has a crosslinked structure produced by the copolymerization of styrene or acrylamide and divinylbenzene, and at least one of a quaternary ammonium group and a tertiary ammonium group, and that is provided with an acid-adsorbing ability. An acid solution whose primary component is hydrochloric acid and that includes indium is brought into contact with the anion-exchange resin to cause indium to be adsorbed to the anion-exchange resin.
    Type: Application
    Filed: July 7, 2005
    Publication date: February 14, 2008
    Applicants: AQUATECH CORPORATION, SHARP KABUSHIKI KAISHA
    Inventors: Akifusai Ohnishi, Nobuaki Fujiwara, Hideki Doi, Toyokazu Matsunami, Hiroshi Tsubota, Toshiaki Muratani, Shoji Nishikawa, Shinichi Yamasaki, Takamichi Honma
  • Publication number: 20060055243
    Abstract: An objective is to detect a resolver malfunction without fail, using a low-cost resolver having the small number of the poles, and a control-motor system having advantage in small sizing and high-power outputting. In the control-motor system, the system for driving a 2m-pole motor based on a rotor rotation angle ? detected by a 2n-pole resolver, where m and n being counting numbers, is characterized in that: the sum of the square of a signal modulated by sin ? and the square of a signal modulated by cos ? in the resolver in which an excitation signal generated in said system is modulated by sin ? and cos ? in response to the rotor rotation angle ? of the resolver is compared to a predetermined malfunction threshold value, so that malfunction determination related to the resolver is performed, and also, given that the sum is a2 when the resolver is recognized to be in normal operation, the malfunction determination threshold value is made to be not smaller than {a×cos((?/2)/(m/n))}2.
    Type: Application
    Filed: July 11, 2005
    Publication date: March 16, 2006
    Inventors: Masaki Matsushita, Takayuki Kifuku, Hideki Doi, Katsuhiko Ohmae
  • Publication number: 20020088541
    Abstract: The method disclosed is for thermoplastic welding, by fusion bonding, an integral assembly of at least two composite thermoplastic parts (2, 4). One part (2) is integrally molded with a plurality of ribs (7) to be used and bonded to their mates (8) of the counterpart (4). A heat generator assembly (3) applies heat energy to the ribs (7, 8) of the parts so as to heat and thus fuse them. Immediately after the application of the heat energy, pressure is applied to the heated parts (2, 4) to push them together. The heated ribs (7) of the part (2) are consequently aligned and bonding contacted with the heated ribs (8) of the counterpart (4). This application of pressure is maintained during a predetermined period to facilitate fusion bonding of the ribs (7, 8). Finally, an integral assembly in which the part (2) is rigidly welded to the counterpart (4) the ribs (7, 8) is produced.
    Type: Application
    Filed: December 26, 2001
    Publication date: July 11, 2002
    Inventors: Kazuyuki Nishikawa, Naoshi Makiguchi, Mitsuo Hosokawa, Hisamoto Tsuiki, Hideki Doi
  • Patent number: 6259147
    Abstract: A semiconductor device includes: an insulation layer; a fuse layer extending on the insulation layer in one direction and disconnected through light radiation to control a redundant circuit; a pseudo fuse layer on the insulation layer along at least one side of the fuse layer; another insulation layer covering the fuse layer and the pseudo fuse layer; and a protection film formed on another insulation layer and having an opening in a region opposite to the fuse layer. Fuse layers having a spacing of less than 4 &mgr;m or 4.5 to 5.5 &mgr;m. Such a structure allows a semiconductor device with a fuse layer capable of being disconnected reliably and providing a smaller blow trace.
    Type: Grant
    Filed: January 7, 1999
    Date of Patent: July 10, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takeshi Iwamoto, Rui Toyota, Kaoru Motonami, Yasuhiro Ido, Masatoshi Kimura, Kakutaro Suda, Kazuhide Kawabe, Hideki Doi, Hiroaki Sekikawa
  • Patent number: 5754967
    Abstract: A low-cost torque detection apparatus is obtained using wheel revolution sensors which are generally provided in a conventional ABS and an engine revolution sensor which is generally provided in a conventional engine fuel jet controller. The apparatus can be used, for example, in a vehicle having a drive source, such as an engine or a motor, for driving wheels which is coupled to the right and left wheels by respective shafts having torsional stiffness for transmitting a drive torque through a differential gear. The apparatus includes a drive source revolution angle detection device for the drive source and wheel revolution angle detection means for the right and left wheels, and calculates torques of shafts such as drive shafts for coupling the differential gear to the wheels using a torque calculator.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: May 19, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Noriyuki Inoue, Yukiyasu Akemi, Minoru Nishida, Yasuo Naito, Hideki Doi, Chiaki Fujimoto
  • Patent number: 5657229
    Abstract: A anti-skid control system detects a torsion torque applied to each of the wheels of a vehicle, and controls a braking force on the basis of a corrected acceleration as a wheel acceleration is corrected by the detected torsion torque. The corrected acceleration Gc can approximately be expressed by Gc=(Kr/Iw)(.mu..multidot.W.multidot.r-Tb), where Iw, inertia moment of the wheel .omega., angular velocity of the wheel (the turning direction of the wheel when it advances is positive); Tt, torsion torque; .mu., friction coefficient of the road surface; W, load on the wheel; r, radius of the wheel; Tb, brake torque; Kr, constant.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: August 12, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuo Naito, Hideki Doi, Chiaki Fujimoto
  • Patent number: 5525725
    Abstract: A process for producing a high purity caprolactam is disclosed in which a crude caprolactam obtained by a catalytic rearrangement of cyclohexanone oxime is subjected(1) to mixing, while stirring, with at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons to form a liquid-liquid, two-layer liquid mixture, and then crystallizing caprolactam out of the liquid mixture;(2) to mixing with both at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons, and water to form a liquid mixture, separating the liquid mixture into a hydrocarbon layer and a water layer, and then recovering caprolactam from the water layer; or(3) to distillation in the co-presence of at least one aliphatic saturated hydrocarbon of 10 to 18 carbon atoms.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: June 11, 1996
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yasuhiko Higashio, Hiroshi Kajikuri, Keisuke Sugita, Hideki Doi, Masanobu Matsubara
  • Patent number: 5501109
    Abstract: A torsion torque detecting device includes a power unit rotation velocity detector for detecting a rotation velocity of a power unit for driving a vehicle, a power unit rotation acceleration calculator for calculating a rotation acceleration of the power unit based on the rotation velocity of the power unit, a power unit output torque calculator for calculating an output torque of the power unit based on operational parameters of the power unit, and a torsion torque calculator for calculating torsion torques of wheel drive shafts for driving wheels based on the rotation acceleration of the power unit and the output torque of the power unit.
    Type: Grant
    Filed: March 1, 1995
    Date of Patent: March 26, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuo Naito, Hideki Doi, Chialki Fujimoto
  • Patent number: 5459261
    Abstract: A process for producing a high purity caprolactam is disclosed in which a crude caprolactam obtained by a catalytic rearrangement of cyclohexanone oxime is subjected(1) to mixing, while stirring, with at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons to form a liquid-liquid, two-layer liquid mixture, and then crystallizing caprolactam out of the liquid mixture;(2) to mixing with both at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons, and water to form a liquid mixture, separating the liquid mixture into a hydrocarbon layer and a water layer, and then recovering caprolactam from the water layer; or(3) to distillation in the co-presence of at least one aliphatic saturated hydrocarbon of 10 to 18 carbon atoms.
    Type: Grant
    Filed: August 15, 1994
    Date of Patent: October 17, 1995
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yasuhiko Higashio, Hiroshi Kajikuri, Keisuke Sugita, Hideki Doi, Masanobu Matsubara
  • Patent number: 5362870
    Abstract: A process for producing a high purity caprolactam is disclosed in which a crude caprolactam obtained by a catalytic rearrangement of cyclohexanone oxime is subjected(1) to mixing, while stirring, with at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons to form a liquid-liquid, two-layer liquid mixture, and then crystallizing caprolactam out of the liquid mixture;(2) to mixing with both at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons, and water to form a liquid mixture, separating the liquid mixture into a hydrocarbon layer and a water layer, and then recovering caprolactam from the water layer; or(3) to distillation in the co-presence of at least one aliphatic saturated hydrocarbon of 10 to 18 carbon atoms.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: November 8, 1994
    Assignee: Sumitomo Chemical Company, Ltd.
    Inventors: Yasuhiko Higashio, Hiroshi Kajikuri, Keisuke Sugita, Hideki Doi, Masanobu Matsubara