Patents by Inventor Akihiko Nishimura
Akihiko Nishimura 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: 20120247236Abstract: A sensor with aging function is provided wherein installation space for an apparatus to perform an aging process and the number of apparatuses can be reduced which enables easy and reliable aging processes and can improve measuring accuracy and enhance measuring reliability of the sensor. The sensor with aging function 10 is attached, through a bonding agent 15, to a high temperature measuring object 14, comprising a block body 12 constructed by integrally forming a sensor main body 11 and an electric heater 13 disposed in a manner to be close to the sensor main body 11 using a molding process, wherein a bonding surface on which the bonding agent 15 is applied is formed on the measuring object 14 side of the block body 12.Type: ApplicationFiled: December 9, 2011Publication date: October 4, 2012Applicants: JAPAN ATOMIC ENERGY AGENCY, KUMAGAI GUMI CO., LTD.Inventors: Hisayoshi ISHIBASHI, Hirokazu SUZUKI, Akihiko NISHIMURA, Yukihiro SHIMADA
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Publication number: 20120247237Abstract: A sensor and bonding agent for the sensor wherein thickness of the bonding agent interposed between the sensor and measuring object can be kept uniform to maintain uniform bonding force of the bonding agent and a peeling phenomenon of the bonding agent occurring due to a difference in thermal expansion between the measuring object and bonding agent and/or between the bonding agent and the sensor can be prevented. The sensor is attached, through the bonding agent, to a high-temperature measuring object, include a sensor main body having a detecting section, a block body constructed by integrally forming the sensor main body using a molding process. The block body is made of a ceramic-based bonding material that the same as a material forming the bonding agent and, on a side of the measuring object of the block body, a bonding surface of the bonding agent is formed.Type: ApplicationFiled: December 9, 2011Publication date: October 4, 2012Applicants: JAPAN ATOMIC ENERGY AGENCY, KUMAGAI GUMI CO., LTDInventors: Hisayoshi ISHIBASHI, Hirokazu SUZUKI, Akihiko NISHIMURA, Yukihiro SHIMADA
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Patent number: 8099211Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating a state of the steering system, a frequency component corresponding to a vibration of a steering system caused by stress applied to steerable wheels. The extracting section outputs an effective value of the extracted frequency component as a power spectrum to a second computing section. In the case that the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer enhances a torque inertia compensation control so as to suppress vibration of the steering system caused by the stress. In other words, the microcomputer increases a torque inertia compensation amount corresponding to a compensation component based on a steering torque differential value.Type: GrantFiled: April 17, 2008Date of Patent: January 17, 2012Assignee: Jtekt CorporationInventors: Akihiko Nishimura, Hirozumi Eki
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Patent number: 8082080Abstract: An electric power steering (EPS) apparatus 1 includes a motor 12, an EPS actuator 10, a torque sensor 14, and an ECU 11. The EPS actuator 10 uses the motor 12 as a drive source to apply assist force to a steering system, thereby assisting a steering operation. The torque sensor 14 detects a steering torque ? of the steering system. The ECU 11 controls the operation of the EPS actuator 10. Based on the steering torque ? detected by the torque sensor 14, the ECU 11 computes a basic shift amount ?ts_b of the assist force applied to the steering system. The ECU 11 determines which one of returning, holding, and turning is the state of the steering operation. When the state of the steering operation is returning or holding, the ECU 11 executes compensation control for correcting the steering torque ?, which is used in the computation of the basic shift amount ?ts_b of the assist force, thereby increasing the assist force applied to the steering system.Type: GrantFiled: June 2, 2009Date of Patent: December 20, 2011Assignee: JTEKT CorporationInventors: Masayuki Kita, Terutaka Tamaizumi, Akihiko Nishimura, Shinya Aono, Jun Hasegawa, Akira Nambu
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Patent number: 7909131Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating the state of a steering system, a frequency component corresponding to a vibration that increases generation of a rattling noise in a speed reducing mechanism. The extracting section outputs an effective value of the extracted frequency component as a power spectrum. If the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer outputs a motor control signal to reduce the assist force generated by the EPS actuator.Type: GrantFiled: April 30, 2008Date of Patent: March 22, 2011Assignee: JTEKT CorporationInventor: Akihiko Nishimura
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Publication number: 20110058767Abstract: A reinforced sensor with an optical fiber woven into a fabric, comprising a fabric formed in a manner that a weft yarn is woven thereinto in a direction substantially perpendicular to a warp yarn, wherein an optical fiber is included in at least either one of fibers of the warp yarn and the weft yarn. The optical fiber may function as a FBG sensor.Type: ApplicationFiled: August 25, 2010Publication date: March 10, 2011Applicants: KUMAGAI GUMI CO., LTD., JAPAN ATOMIC ENERGY AGENCY, FIBEX CO., LTD.Inventors: Hisayoshi Ishibashi, Hirokazu Suzuki, Kiyoshi Oka, Akihiko Nishimura, Kazuyuki Tsukimori, Sumiyuki Matsubara, Kazumasa Kosugi
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Publication number: 20100324783Abstract: A steering torque shift control amount calculation unit (31) calculates the steering torque shift control amount (?ts) by multiplying the basic shift amount (?ts_b) used as the basic compensation component by the transition coefficient (Kss). Then, the steering torque shift control amount (?ts) is subjected to the low-pass filter process in an abrupt change prevention processing unit (32). An abrupt change prevention processing unit (40) is provided in the steering torque shift control amount calculation unit (31). The transition coefficient (Kss) is subjected to the low-pass filter process in the abrupt change prevention processing unit (40). The cutoff frequency of the low-pass filter that forms the abrupt change prevention processing unit (40) is set to a value lower than the cutoff frequency of the low-pass filter that forms the abrupt change prevention processing unit (32) that executes the low-pass filter process on the torque shift control amount (?ts).Type: ApplicationFiled: June 18, 2010Publication date: December 23, 2010Applicant: JTEKT CORPORATIONInventors: Akihiko NISHIMURA, Terutaka Tamaizumi, Masayuki Kita, Shinya Aono, Jun Hasegawa, Akira Nambu
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Patent number: 7684912Abstract: An electric power steering apparatus is provided for suppressing the effect on the steering wheel of external interference inputted from the tie rod. The apparatus includes first and second output units for outputting first and second control amounts in accordance with the outputted torque signal, except in a dead zone thereof, respectively. The apparatus also includes gain data output units for, when the torque signal, a steering angular velocity, and a vehicle speed are within predetermined ranges, outputting gain data respectively. Steering operation is assisted by an electric motor driven on the basis of the first and second control amounts and the gain data, which afford a control signal to the motor.Type: GrantFiled: November 11, 2005Date of Patent: March 23, 2010Assignee: JTEKT CorporationInventor: Akihiko Nishimura
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Patent number: 7651576Abstract: The method of preventing cold-worked stress corrosion cracking in the iron steels and alloyed steels including stainless steels comprises removing a residual tensile stressed layer, optionally generating residual compression, through the impact of irradiation with the ultra-short femtosecond pulse and kW class high average-power laser, and removing a hardened surface layer extremely susceptible to stress corrosion cracking, whereby this susceptible hardened surface layer with many concentrated dislocation defects and the likes is removed without generating or introducing any of such hardened layer in the process of its removal. The method is free from the risk of damaging other equipment by peening with steel balls or other shaped shots, is almost unlimited in actual environment, effectiveness, work, place and other conditions for application, is inexpensive, and functions continuously for a much longer period than an ordinary nuclear reactor's service lifetimes.Type: GrantFiled: August 30, 2005Date of Patent: January 26, 2010Assignee: Japan Atomic Energy Research InstituteInventors: Eisuke Minehara, Akihiko Nishimura, Takashi Tsukada
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Publication number: 20090299575Abstract: An electric power steering (EPS) apparatus 1 includes a motor 12, an EPS actuator 10, a torque sensor 14, and an ECU 11. The EPS actuator 10 uses the motor 12 as a drive source to apply assist force to a steering system, thereby assisting a steering operation. The torque sensor 14 detects a steering torque ? of the steering system. The ECU 11 controls the operation of the EPS actuator 10. Based on the steering torque ? detected by the torque sensor 14, the ECU 11 computes a basic shift amount ?ts_b of the assist force applied to the steering system. The ECU 11 determines which one of returning, holding, and turning is the state of the steering operation. When the state of the steering operation is returning or holding, the ECU 11 executes compensation control for correcting the steering torque ?, which is used in the computation of the basic shift amount ?ts_b of the assist force, thereby increasing the assist force applied to the steering system.Type: ApplicationFiled: June 2, 2009Publication date: December 3, 2009Applicant: JTEKT CorporationInventors: Masayuki KITA, Terutaka Tamaizumi, Akihiko Nishimura, Shinya Aono, Jun Hasegawa, Akira Nambu
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Publication number: 20090143938Abstract: An electric power steering apparatus is provided for suppressing the effect on the steering wheel of external interference inputted from the tie rod. The apparatus includes first and second output units for outputting first and second control amounts in accordance with the outputted torque signal, except in a dead zone thereof, respectively. The apparatus also includes gain data output units for, when the torque signal, a steering angular velocity, and a vehicle speed are within predetermined ranges, outputting gain data respectively. Steering operation is assisted by an electric motor driven on the basis of the first and second control amounts and the gain data, which afford a control signal to the motor.Type: ApplicationFiled: November 11, 2005Publication date: June 4, 2009Applicant: JTEKT CORPORATIONInventor: Akihiko Nishimura
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Publication number: 20080277192Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating the state of a steering system, a frequency component corresponding to a vibration that increases generation of a rattling noise in a speed reducing mechanism. The extracting section outputs an effective value of the extracted frequency component as a power spectrum. If the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer outputs a motor control signal to reduce the assist force generated by the EPS actuator.Type: ApplicationFiled: April 30, 2008Publication date: November 13, 2008Applicant: JTEKT CorporationInventor: Akihiko Nishimura
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Publication number: 20080262678Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating a state of the steering system, a frequency component corresponding to a vibration of a steering system caused by stress applied to steerable wheels. The extracting section outputs an effective value of the extracted frequency component as a power spectrum to a second computing section. In the case that the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer enhances a torque inertia compensation control so as to suppress vibration of the steering system caused by the stress. In other words, the microcomputer increases a torque inertia compensation amount corresponding to a compensation component based on a steering torque differential value.Type: ApplicationFiled: April 17, 2008Publication date: October 23, 2008Applicant: JTEKT CorporationInventors: Akihiko NISHIMURA, Hirozumi Eki
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Publication number: 20060048867Abstract: The method of preventing cold-worked stress corrosion cracking in the iron steels and alloyed steels including stainless steels comprises removing a residual tensile stressed layer, optionally generating residual compression, through the impact of irradiation with the ultra-short femtosecond pulse and kW class high average-power laser, and removing a hardened surface layer extremely susceptible to stress corrosion cracking, whereby this susceptible hardened surface layer with many concentrated dislocation defects and the likes is removed without generating or introducing any of such hardened layer in the process of its removal. The method is free from the risk of damaging other equipment by peening with steel balls or other shaped shots, is almost unlimited in actual environment, effectiveness, work, place and other conditions for application, is inexpensive, and functions continuously for a much longer period than an ordinary nuclear reactor's service lifetimes.Type: ApplicationFiled: August 30, 2005Publication date: March 9, 2006Applicant: Japan Atomic Energy Research InstituteInventors: Eisuke Minehara, Akihiko Nishimura, Takashi Tsukada