Patents by Inventor Masashi Asuka
Masashi Asuka 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: 20240067239Abstract: A train control device (20) to be installed on a train (10) includes an acquisition unit (21) that obtains first pulses from a velocity sensor (31) for detecting the first pulses generated on a first axle of the train (10) and obtains second pulses from a velocity sensor (32) for detecting the second pulses generated on a second axle of the train (10), a storage unit (22) that stores the first pulses and the second pulses, and a control unit (23) that determines occurrence or non-occurrence of a slip or a slide of the train (10) based on a pulse ratio, where the pulse ratio is a ratio between a number of first pulses detected during a time period in which the train (10) traveled a given distance among the first pulses, and a number of second pulses detected during a time period in which the train (10) traveled the given distance among the second pulses.Type: ApplicationFiled: January 14, 2021Publication date: February 29, 2024Applicant: Mitsubishi Electric CorporationInventors: Masashi ASUKA, Makoto TOKUMARU, Mototsugu KOZAKI, Akira NAKANISHI
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Publication number: 20240067241Abstract: A train control device includes: a control unit that calculates a control speed of the train at a current position with respect to a target speed at a target position of the train, by using a travel distance from the current position to the target position of the train, an altitude difference between the current position and the target position, a braking force of a brake device of the train, first potential energy including an influence of an altitude difference based on a gradient of the track in a section from a head position to a tail position of the train at the current position, and second potential energy including an influence of an altitude difference based on a gradient of the track in a section from a head position to a tail position of the train at the target position.Type: ApplicationFiled: January 20, 2021Publication date: February 29, 2024Applicant: Mitsubishi Electric CorporationInventors: Masashi ASUKA, Makoto TOKUMARU, Mototsugu KOZAKI, Akira NAKANISHI
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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: 11560166Abstract: A train control apparatus includes a setting reception unit that receives setting information regarding a temporary speed limit section and a speed limit. A control unit generates temporary speed limit information for the trains. A communication unit transmits the temporary speed limit information to the trains. If information regarding all temporary speed limit sections cannot be included in the temporary speed limit information, the control unit includes, in the temporary speed limit information, information regarding a specified number of temporary speed limit sections located on a traveling direction side, and changes a speed limit in one or more temporary speed limit sections included in the temporary speed limit information on the basis of a speed limit set in a temporary speed limit section that is adjacent to a temporary speed limit section included in the temporary speed limit information, and is not included in the temporary speed limit information.Type: GrantFiled: January 26, 2018Date of Patent: January 24, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi Asuka, Takaya Katsuragi, Shuichi Takagi, Katsunori Tsuchida, Tomohiro Onishi
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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: 20210403061Abstract: A train control apparatus includes a setting reception unit that receives setting information regarding a temporary speed limit section and a speed limit. A control unit generates temporary speed limit information for the trains. A communication unit transmits the temporary speed limit information to the trains. If information regarding all temporary speed limit sections cannot be included in the temporary speed limit information, the control unit includes, in the temporary speed limit information, information regarding a specified number of temporary speed limit sections located on a traveling direction side, and changes a speed limit in one or more temporary speed limit sections included in the temporary speed limit information on the basis of a speed limit set in a temporary speed limit section that is adjacent to a temporary speed limit section included in the temporary speed limit information, and is not included in the temporary speed limit information.Type: ApplicationFiled: January 26, 2018Publication date: December 30, 2021Applicant: Mitsubishi Electric CorporationInventors: Masashi ASUKA, Takaya KATSURAGI, Shuichi TAKAGI, Katsunori TSUCHIDA, Tomohiro ONISHI
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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: 11040732Abstract: A wireless train control system includes: a device that generates a track circuit state signal indicating whether a track circuit is picked up or dropped and a time-triggered track circuit state signal indicating a drop at a timing delayed by a set time after the track circuit state signal indicates that the track circuit is dropped; and a controller that generates a stop limit point of a wireless-control-compliant train by using presence information if a preceding train is a wireless-control-compliant train, and generates the stop limit point by using the track circuit state signal and the time-triggered track circuit state signal if the preceding train is a non-wireless-control-compliant train. The controller does not update the stop limit point if the track circuit state signal indicates that the track circuit is dropped while the time-triggered track circuit state signal indicates that the track circuit is picked up.Type: GrantFiled: March 9, 2016Date of Patent: June 22, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi Asuka, Atsushi Takami
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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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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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Patent number: 10392039Abstract: To provide a wireless train control system that can perform a stable operation. The wireless train control system controls a wireless-control compliant train following a wireless-control noncompliant train by a ground control device. A stop limit point of the wireless-control compliant train is set by a track circuit in which a tail end position of the wireless-control noncompliant train is present. By using a track-circuit state signal indicating that the track circuit is turned on or turned off and a time-element-added track-circuit state signal indicating turn-off at a timing delayed by a set time after the track-circuit state signal has indicated turn-off, when the track-circuit state signal indicates turn-off and the time-element-added track-circuit state signal indicates turn-on, it is determined that turn-off indicated by the track-circuit state signal is caused by the wireless-control compliant train that is a train itself being present, and the stop limit point is not updated.Type: GrantFiled: October 15, 2015Date of Patent: August 27, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi Asuka, Atsushi Takami
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Publication number: 20190047599Abstract: A wireless train control system includes: a device that generates a track circuit state signal indicating whether a track circuit is picked up or dropped and a time-triggered track circuit state signal indicating a drop at a timing delayed by a set time after the track circuit state signal indicates that the track circuit is dropped; and a controller that generates a stop limit point of a wireless-control-compliant train by using presence information if a preceding train is a wireless-control-compliant train, and generates the stop limit point by using the track circuit state signal and the time-triggered track circuit state signal if the preceding train is a non-wireless-control-compliant train. The controller does not update the stop limit point if the track circuit state signal indicates that the track circuit is dropped while the time-triggered track circuit state signal indicates that the track circuit is picked up.Type: ApplicationFiled: March 9, 2016Publication date: February 14, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi ASUKA, Atsushi TAKAMI
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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: 20180304909Abstract: To provide a wireless train control system that can perform a stable operation. The wireless train control system controls a wireless-control compliant train following a wireless-control noncompliant train by a ground control device. A stop limit point of the wireless-control compliant train is set by a track circuit in which a tail end position of the wireless-control noncompliant train is present. By using a track-circuit state signal indicating that the track circuit is turned on or turned off and a time-element-added track-circuit state signal indicating turn-off at a timing delayed by a set time after the track-circuit state signal has indicated turn-off, when the track-circuit state signal indicates turn-off and the time-element-added track-circuit state signal indicates turn-on, it is determined that turn-off indicated by the track-circuit state signal is caused by the wireless-control compliant train that is a train itself being present, and the stop limit point is not updated.Type: ApplicationFiled: October 15, 2015Publication date: October 25, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masashi ASUKA, Atsushi TAKAMI
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Patent number: 9642163Abstract: A train control device includes an on-vehicle base station mounted on a train, base stations that can communicate with the on-vehicle base station, an on-vehicle control device controlling an operation such that the train can stop before reaching a stop limit before which the train can run safely, and ground control devices that transmit, to the train side, the stop limit calculated based on information on the current position acquired from the train side via the base stations and opening information on a turnout on the ground. The on-vehicle control device calculates a channel-reservation start pattern, which is a pattern determining a reservation start position of a communication channel of a base station as a switching target when the base station as a communication partner to the on-vehicle base station is switched and in which the reservation start position is different according to train speed and train position.Type: GrantFiled: June 11, 2013Date of Patent: May 2, 2017Assignee: Mitsubishi Electric CorporationInventors: Yusaku Nagasaki, Masashi Asuka, Atsushi Takami
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Publication number: 20150078276Abstract: A train control device includes an on-vehicle base station mounted on a train, base stations that can communicate with the on-vehicle base station, an on-vehicle control device controlling an operation such that the train can stop before reaching a stop limit before which the train can run safely, and ground control devices that transmit, to the train side, the stop limit calculated based on information on the current position acquired from the train side via the base stations and opening information on a turnout on the ground. The on-vehicle control device calculates a channel-reservation start pattern, which is a pattern determining a reservation start position of a communication channel of a base station as a switching target when the base station as a communication partner to the on-vehicle base station is switched and in which the reservation start position is different according to train speed and train position.Type: ApplicationFiled: June 11, 2013Publication date: March 19, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yusaku Nagasaki, Masashi Asuka, Atsushi Takami
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Patent number: 8967553Abstract: In accordance with a predetermined segment definition rule based on a point-switch protection section, a point switch control direction, and a train advancing direction, a plurality of segments are defined in advance with respect to a railway network. Segment competition information in which a competitive relationship between the plurality of segments is set in advance is prepared. A segment use permission setting part determines whether or not a competition for a use-requested segment in terms of a train operation occurs between the plurality of trains, by using segment competition information and segment use permission status information. A use-requested segment for which it is determined that no competition occurs is incorporated, as a use permission segment, into use permission segment information of the corresponding train. In accordance with a result of the competition determination, the segment use permission status information is updated.Type: GrantFiled: November 15, 2011Date of Patent: March 3, 2015Assignee: Mitsubishi Electric CorporationInventors: Masashi Asuka, Satoru Takahashi, Koki Yoshimoto, Atsushi Takami, Yusaku Nagasaki
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Patent number: 8774992Abstract: A next station state estimating unit estimates a preceding train position from information about a stop track circuit of a current train and from a signal aspect table. It estimates the time, at which the preceding train exits the next station and brake pattern before the station is canceled, from information about the preceding train position, from information about the occupied track circuit on which the current train is present and related information between track circuits and a station and information about occupied duration of the station, which are retained in a track database, and from a history of the preceding train position retained in a history retaining unit. The time estimated is sent to a driver's cab by a communication unit.Type: GrantFiled: November 18, 2010Date of Patent: July 8, 2014Assignee: Mitsubishi Electric CorporationInventors: Koki Yoshimoto, Kenji Kataoka, Masashi Asuka, Takaya Katsuragi