Patents by Inventor Tomoaki TAKEWA
Tomoaki TAKEWA 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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Patent number: 11919550Abstract: A rail breakage detection device includes a first core part provided to a first cable connecting an electrical neutral point of an impedance bond that electrically connects a first rail and a second rail to the first rail, a second core part provided to a second cable connecting the electrical neutral point of the impedance bond to the second rail, a first coil wound around the first core part to generate a first electromotive force in accordance with a current variation occurring in the first cable, a second coil connected electrically to the first coil and wound around the second core part to generate a second electromotive force in accordance with a current variation occurring in the second cable, and a CPU to determine that the first or second rail is broken based on an electromotive force that is a sum of the first and second electromotive forces.Type: GrantFiled: July 26, 2018Date of Patent: March 5, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Tomoaki Takewa, Takafumi Nagano, Yoshitsugu Sawa, Wataru Tsujita, Kenzo Makino, Katsunori Tsuchida, Daisuke Koshino
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Patent number: 11572088Abstract: A rail break detection device to which an output waveform from a vibration sensor, which is a first vibration sensor, and an output waveform from a vibration sensor, which is a second vibration sensor, are input, the vibration sensors being mounted on different positions of rails, includes a waveform similarity determination unit to compare impulse waveforms separated from the output waveforms or compare continuous waveforms separated from the output waveforms, and determine similarity therebetween, and detects a break of a rail.Type: GrantFiled: April 4, 2017Date of Patent: February 7, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi Asuka, Wataru Tsujita, Tomoaki Takewa, Yoshitsugu Sawa, Daisuke Koshino
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Patent number: 11527987Abstract: Provided is an abnormality diagnosis device including: a physical quantity measurement processor configured to acquire, as time-series data, a physical quantity of an electric motor or a load; a feature parameter calculation processor configured to calculate feature parameters; a correlation function creation processor configured to create a correlation function for two or more feature parameters, and calculate a correlation coefficient corresponding to a measurement result of the physical quantity that changes depending on an abnormality occurrence state; a database configured to store in advance reference data in which a remaining time until a failure is caused and the correlation coefficient are associated with each other; and a diagnosis processor configured to extract from the reference data the remaining time corresponding to the correlation coefficient, and identify the remaining time until the electric motor or the load causes a failure or a part that has caused a failure.Type: GrantFiled: December 27, 2018Date of Patent: December 13, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroshi Inoue, Makoto Kanemaru, Junji Hori, Tomoaki Takewa, Takuma Sasai
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Patent number: 11325623Abstract: A purpose of the invention is to provide a rail breakage detection device mountable also on a vehicle. The invention is directed to a rail breakage detection device that receives: transmission-device state information indicating whether a rail signal transmission device that sends a rail signal is normal; reception-device state information indicating whether a rail signal reception device that receives a voltage induced by the rail signal is normal; and reception state information indicating whether a voltage induced by the rail signal reception device is received, and the rail breakage detection device performs rail breakage detection on the basis of the transmission-device state information, the reception-device state information, and the reception state information.Type: GrantFiled: January 13, 2017Date of Patent: May 10, 2022Assignee: Mitsubishi Electric CorporationInventors: Daisuke Koshino, Masashi Asuka, Wataru Tsujita, Tomoaki Takewa, Yoshitsugu Sawa
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Publication number: 20220006417Abstract: Provided is an abnormality diagnosis device including: a physical quantity measurement processor configured to acquire, as time-series data, a physical quantity of an electric motor or a load; a feature parameter calculation processor configured to calculate feature parameters; a correlation function creation processor configured to create a correlation function for two or more feature parameters, and calculate a correlation coefficient corresponding to a measurement result of the physical quantity that changes depending on an abnormality occurrence state; a database configured to store in advance reference data in which a remaining time until a failure is caused and the correlation coefficient are associated with each other; and a diagnosis processor configured to extract from the reference data the remaining time corresponding to the correlation coefficient, and identify the remaining time until the electric motor or the load causes a failure or a part that has caused a failure.Type: ApplicationFiled: December 27, 2018Publication date: January 6, 2022Applicant: Mitsubishi Electric CorporationInventors: Hiroshi INOUE, Makoto KANEMARU, Junji HORI, Tomoaki TAKEWA, Takuma SASAI
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Publication number: 20210269075Abstract: A rail breakage detection device includes a first core part provided to a first cable connecting an electrical neutral point of an impedance bond that electrically connects a first rail and a second rail to the first rail, a second core part provided to a second cable connecting the electrical neutral point of the impedance bond to the second rail, a first coil wound around the first core part to generate a first electromotive force in accordance with a current variation occurring in the first cable, a second coil connected electrically to the first coil and wound around the second core part to generate a second electromotive force in accordance with a current variation occurring in the second cable, and a CPU to determine that the first or second rail is broken based on an electromotive force that is a sum of the first and second electromotive forces.Type: ApplicationFiled: July 26, 2018Publication date: September 2, 2021Applicant: Mitsubishi Electric CorporationInventors: Tomoaki TAKEWA, Takafumi NAGANO, Yoshitsugu SAWA, Wataru TSUJITA, Kenzo MAKINO, Katsunori TSUCHIDA, Daisuke KOSHINO
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Patent number: 11046341Abstract: A moving path memory stores a moving path of a train in advance. A signal receiver receives satellite positioning signals. A position calculator calculates measured positions and receiver clock errors, based on the satellite positioning signals and the moving path. A error area calculator sets vector pairs, each consisting of arbitrary two vectors perpendicular to each other on a plane spanned by a tangent vector and a radial vector of a tangent circle of the moving path at the measured positions, and calculates an error area for each vector pair, based on the measured positions, the receiver clock errors, and positions of positioning satellites. A position range extractor extracts a part of the moving path included in each error area, as a candidate position range corresponding to the error area. A position range restrictor determines a common area of the candidate position ranges, as a position range of the train.Type: GrantFiled: January 17, 2017Date of Patent: June 29, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Tomoaki Takewa, Wataru Tsujita, Masahiro Shikai, Tadashi Yamamoto, Masashi Asuka, Seiya Nagashima, Yoshitsugu Sawa
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Patent number: 10946879Abstract: The rail fracture detection device detects a rail fracture in a section provided with the track circuit by determining presence or absence of a rail fracture and determining presence or absence of a train on a rail by using information on whether a relay of the track circuit is activated or deactivated and information on a current value of current flowing in the track circuit.Type: GrantFiled: January 13, 2017Date of Patent: March 16, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi Asuka, Tomoaki Takewa, Wataru Tsujita, Yoshitsugu Sawa, Daisuke Koshino
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Patent number: 10859708Abstract: A test signal generator generates a first test signal. A test signal transmitter transmits the first test signal. An RF receiver unit receives the first test signal and a first satellite signal through a receiving antenna, and generates a second test signal and a second satellite signal, respectively. Each of first and second demodulators calculates a correlation value between the second satellite signal and the spreading code to acquire a satellite. A first failure detector unit compares a signal intensity of the second test signal with a threshold to generate a first failure detection signal. A second failure detector compares the satellites acquired by the first and second demodulator to generate a second failure detection signal. A state determiner determines whether and where a failure exists, using the first and second failure detection signals.Type: GrantFiled: May 10, 2016Date of Patent: December 8, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Tomoaki Takewa, Wataru Tsujita, Yoshitsugu Sawa, Kenji Kataoka, Tadashi Yamamoto, Seiya Nagashima
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Publication number: 20190351923Abstract: A purpose of the invention is to provide a rail breakage detection device mountable also on a vehicle. The invention is directed to a rail breakage detection device that receives: transmission-device state information indicating whether a rail signal transmission device that sends a rail signal is normal; reception-device state information indicating whether a rail signal reception device that receives a voltage induced by the rail signal is normal; and reception state information indicating whether a voltage induced by the rail signal reception device is received, and the rail breakage detection device performs rail breakage detection on the basis of the transmission-device state information, the reception-device state information, and the reception state information.Type: ApplicationFiled: January 13, 2017Publication date: November 21, 2019Applicant: Mitsubishi Electric CorporationInventors: Daisuke KOSHINO, Masashi ASUKA, Wataru TSUJITA, Tomoaki TAKEWA, Yoshitsugu SAWA
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Publication number: 20190300032Abstract: A rail break detection device to which an output waveform from a vibration sensor, which is a first vibration sensor, and an output waveform from a vibration sensor, which is a second vibration sensor, are input, the vibration sensors being mounted on different positions of rails, includes a waveform similarity determination unit to compare impulse waveforms separated from the output waveforms or compare continuous waveforms separated from the output waveforms, and determine similarity therebetween, and detects a break of a rail.Type: ApplicationFiled: April 4, 2017Publication date: October 3, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi ASUKA, Wataru TSUJITA, Tomoaki TAKEWA, Yoshitsugu SAWA, Daisuke KOSHINO
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Publication number: 20190047600Abstract: The rail fracture detection device detects a rail fracture in a section provided with the track circuit by determining presence or absence of a rail fracture and determining presence or absence of a train on a rail by using information on whether a relay of the track circuit is activated or deactivated and information on a current value of current flowing in the track circuit.Type: ApplicationFiled: January 13, 2017Publication date: February 14, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi ASUKA, Tomoaki TAKEWA, Wataru TSUJITA, Yoshitsugu SAWA, Daisuke KOSHINO
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Publication number: 20190031219Abstract: A moving path memory stores a moving path of a train in advance. A signal receiver receives satellite positioning signals. A position calculator calculates measured positions and receiver clock errors, based on the satellite positioning signals and the moving path. A error area calculator sets vector pairs, each consisting of arbitrary two vectors perpendicular to each other on a plane spanned by a tangent vector and a radial vector of a tangent circle of the moving path at the measured positions, and calculates an error area for each vector pair, based on the measured positions, the receiver clock errors, and positions of positioning satellites. A position range extractor extracts a part of the moving path included in each error area, as a candidate position range corresponding to the error area. A position range restrictor determines a common area of the candidate position ranges, as a position range of the train.Type: ApplicationFiled: January 17, 2017Publication date: January 31, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tomoaki TAKEWA, Wataru TSUJITA, Masahiro SHIKAI, Tadashi YAMAMOTO, Masashi ASUKA, Seiya NAGASHIMA, Yoshitsugu SAWA
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Publication number: 20180203127Abstract: A test signal generator generates a first test signal. A test signal transmitter transmits the first test signal. An RF receiver unit receives the first test signal and a first satellite signal through a receiving antenna, and generates a second test signal and a second satellite signal, respectively. Each of first and second demodulators calculates a correlation value between the second satellite signal and the spreading code to acquire a satellite. A first failure detector unit compares a signal intensity of the second test signal with a threshold to generate a first failure detection signal. A second failure detector compares the satellites acquired by the first and second demodulator to generate a second failure detection signal. A state determiner determines whether and where a failure exists, using the first and second failure detection signals.Type: ApplicationFiled: May 10, 2016Publication date: July 19, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tomoaki TAKEWA, Wataru TSUJITA, Yoshitsugu SAWA, Kenji KATAOKA, Tadashi YAMAMOTO, Seiya NAGASHIMA
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Patent number: 10023211Abstract: A train position detecting device includes: a GPS position guarantee range calculation part for calculating, based on a result of measurement of a position of a train by GPS signals; a tachogenerator-position guarantee range calculation part for calculating, based on a result of measurement of a position of the train by a tachometer generator that measures a relative distance from a measurement carried out previously; and a position determination part that determines, between an end part of the GPS position guarantee range in the first-direction and an end part of the tachogenerator-position guarantee range in the first-direction, a position of an end part on the positive side of the second direction to be a position of the end part of the train in the first-direction.Type: GrantFiled: January 21, 2016Date of Patent: July 17, 2018Assignee: Mitsubishi Electric CorporationInventors: Takaya Katsuragi, Koki Yoshimoto, Wataru Tsujita, Tomoaki Takewa
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Publication number: 20180009454Abstract: A train position detecting device includes: a GPS position guarantee range calculation part for calculating, based on a result of measurement of a position of a train by GPS signals; a tachogenerator-position guarantee range calculation part for calculating, based on a result of measurement of a position of the train by a tachometer generator that measures a relative distance from a measurement carried out previously; and a position determination part that determines, between an end part of the GPS position guarantee range in the first-direction and an end part of the tachogenerator-position guarantee range in the first-direction, a position of an end part on the positive side of the second direction to be a position of the end part of the train in the first-direction.Type: ApplicationFiled: January 21, 2016Publication date: January 11, 2018Applicant: Mitsubishi Electric CorporationInventors: Takaya KATSURAGI, Koki YOSHIMOTO, Wataru TSUJITA, Tomoaki TAKEWA