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).
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Publication number: 20230159091Abstract: This electric power steering device is provided with a function for: notifying a parking assistance device of a statically-steerable upper limit number obtained from an estimated motor current when static steering is performed in turnabout and a current limit value for the purpose of overheat protection of an electric power steering; and notifying the parking assistance device of whether the electric power steering can perform steering according to a target steering angle command, from a target steering angle and a target vehicle speed from the start of parking to the completion thereof, thus preventing interruption due to overheat of the electric power steering during parking assistance.Type: ApplicationFiled: May 29, 2020Publication date: May 25, 2023Applicant: Mitsubishi Electric CorporationInventors: Akio NUMAKURA, Hideki DOI
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Patent number: 11173951Abstract: 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 calculatioType: GrantFiled: November 6, 2017Date of Patent: November 16, 2021Assignee: Mitsubishi Electric CorporationInventors: Yasuaki Hori, Kenta Kawahara, Katsuya Ikemoto, Eiji Iwami, Hideki Doi
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Publication number: 20200391786Abstract: 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 calculatioType: ApplicationFiled: November 6, 2017Publication date: December 17, 2020Applicant: Mitsubishi Electric CorporationInventors: Yasuaki HORI, Kenta KAWAHARA, Katsuya IKEMOTO, Eiji IWAMI, Hideki DOI
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Patent number: 9242670Abstract: 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: GrantFiled: February 19, 2010Date of Patent: January 26, 2016Assignee: Mitsubishi Electric CorporationInventors: Masaya Endo, Masahiko Kurishige, Takayuki Kifuku, Masaki Matsushita, Hideki Doi
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Publication number: 20120296525Abstract: 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: ApplicationFiled: February 19, 2010Publication date: November 22, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masaya Endo, Masahiko Kurishige, Takayuki Kifuku, Masaki Matsushita, Hideki Doi
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Patent number: 7611631Abstract: 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: GrantFiled: July 7, 2005Date of Patent: November 3, 2009Assignees: Aquatech Corporation, Sharp Kabushiki KaishaInventors: Akifusai Ohnishi, Nobuaki Fujiwara, Hideki Doi, Toyokazu Matsunami, Hiroshi Tsubota, Toshiaki Muratani, Shoji Nishikawa, Shinichi Yamasaki, Takamichi Honma
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Patent number: 7336456Abstract: 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: GrantFiled: July 11, 2005Date of Patent: February 26, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masaki Matsushita, Takayuki Kifuku, Hideki Doi, Katsuhiko Ohmae
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Publication number: 20080038188Abstract: 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: ApplicationFiled: July 7, 2005Publication date: February 14, 2008Applicants: AQUATECH CORPORATION, SHARP KABUSHIKI KAISHAInventors: Akifusai Ohnishi, Nobuaki Fujiwara, Hideki Doi, Toyokazu Matsunami, Hiroshi Tsubota, Toshiaki Muratani, Shoji Nishikawa, Shinichi Yamasaki, Takamichi Honma
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Publication number: 20060055243Abstract: 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: ApplicationFiled: July 11, 2005Publication date: March 16, 2006Inventors: Masaki Matsushita, Takayuki Kifuku, Hideki Doi, Katsuhiko Ohmae
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Publication number: 20020088541Abstract: 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: ApplicationFiled: December 26, 2001Publication date: July 11, 2002Inventors: Kazuyuki Nishikawa, Naoshi Makiguchi, Mitsuo Hosokawa, Hisamoto Tsuiki, Hideki Doi
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Patent number: 6259147Abstract: 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: GrantFiled: January 7, 1999Date of Patent: July 10, 2001Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takeshi Iwamoto, Rui Toyota, Kaoru Motonami, Yasuhiro Ido, Masatoshi Kimura, Kakutaro Suda, Kazuhide Kawabe, Hideki Doi, Hiroaki Sekikawa
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Patent number: 5754967Abstract: 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: GrantFiled: September 27, 1995Date of Patent: May 19, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Noriyuki Inoue, Yukiyasu Akemi, Minoru Nishida, Yasuo Naito, Hideki Doi, Chiaki Fujimoto
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Patent number: 5657229Abstract: 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: GrantFiled: May 10, 1995Date of Patent: August 12, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yasuo Naito, Hideki Doi, Chiaki Fujimoto
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Patent number: 5525725Abstract: 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: GrantFiled: August 19, 1994Date of Patent: June 11, 1996Assignee: Sumitomo Chemical Company, LimitedInventors: Yasuhiko Higashio, Hiroshi Kajikuri, Keisuke Sugita, Hideki Doi, Masanobu Matsubara
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Patent number: 5501109Abstract: 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: GrantFiled: March 1, 1995Date of Patent: March 26, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yasuo Naito, Hideki Doi, Chialki Fujimoto
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Patent number: 5459261Abstract: 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: GrantFiled: August 15, 1994Date of Patent: October 17, 1995Assignee: Sumitomo Chemical Company, LimitedInventors: Yasuhiko Higashio, Hiroshi Kajikuri, Keisuke Sugita, Hideki Doi, Masanobu Matsubara
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Patent number: 5362870Abstract: 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: GrantFiled: April 15, 1993Date of Patent: November 8, 1994Assignee: Sumitomo Chemical Company, Ltd.Inventors: Yasuhiko Higashio, Hiroshi Kajikuri, Keisuke Sugita, Hideki Doi, Masanobu Matsubara