Patents by Inventor Wataru Tsujita

Wataru Tsujita 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: 11001282
    Abstract: A rail state monitoring apparatus (1) includes: first and second transmission antennas (101, 102) to transmit first and second electric signals to rails (5, 6), respectively; first reception antenna (201) to receive a surface wave (21) of the first electric signal propagated through rail (5) and guided wave (32) of the second electric signal propagated through loop coil (10); second reception antenna (202) to receive surface wave (22) of the second electric signal propagated through rail (6) and guided wave (31) of the first electric signal propagated through loop coil (10); and a processor. The processor obtains received powers of the respective electric signals received by first and second reception antennas (201, 202), determines a rail state from “good”, “rail broken”, “rail crack”, or “rail surface anomaly” based on the received powers, and outputs the rail state as rail state information.
    Type: Grant
    Filed: October 24, 2018
    Date of Patent: May 11, 2021
    Assignees: MITSUBISHI ELECTRIC CORPORATION, MITSUBISHI ELECTRIC RESEARCH LABORATORIES, INC.
    Inventors: Wataru Tsujita, Kenzo Makino, Atsushi Takami, Bingnan Wang
  • Patent number: 10946879
    Abstract: 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: Grant
    Filed: January 13, 2017
    Date of Patent: March 16, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masashi Asuka, Tomoaki Takewa, Wataru Tsujita, Yoshitsugu Sawa, Daisuke Koshino
  • Patent number: 10884125
    Abstract: A parking assistance device (100) is provided with distance sensors (2FL, 2FR, 2RL, 2RR) which transmit detection waves laterally with respect to a host vehicle (1) while the host vehicle (1) travels and receive reflected waves of the detection waves, a reflection point calculating unit (11) which calculates a reflection point indicating a position where the detection wave is reflected, a grouping unit (13) which groups the reflection points, a parking space pitch calculating unit (14) which calculates a parking space pitch indicating a width of each parking space by using periodicity of a shape of a reflection point group set by grouping, a parking target area setting unit (15) which sets a parking target area which is a target of perpendicular parking by the host vehicle (1), and a parking assistance controlling unit (21) which guides the host vehicle (1) to the parking target area on the basis of the parking space pitch.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: January 5, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinichi Harase, Satoru Inoue, Ryotaro Suzuki, Wataru Tsujita, Yoshitsugu Sawa, Tsutomu Asahina
  • Patent number: 10875447
    Abstract: An optical axis control apparatus is provided with a relative-road-surface-angle calculating unit which calculates a relative horizontal plane angle being an inclination angle of a vehicle with respect to a horizontal plane by using an output value of an acceleration sensor provided on the vehicle and calculates a relative road surface angle being an inclination angle of the vehicle with respect to a road surface by integrating an amount of change of the relative horizontal plane angle while the vehicle is stationary, a relative-road-surface-angle correcting unit which obtains braking information indicating an operation state of a brake device provided on the vehicle and corrects the relative road surface angle for a change in the braking information, and an optical axis control unit which controls an optical axis of headlights provided on the vehicle using the relative road surface angle corrected by the relative-road-surface-angle correcting unit.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: December 29, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Mitsuaki Okada, Takashi Osawa, Wataru Tsujita
  • Patent number: 10866124
    Abstract: An encoder including an emitter to emit a waveform to a scene including a structure. A receiver to receive the waveform reflected from the scene and to measure phases of the received waveform for a period of time. A memory to store a signal model relating phase measurements of the received waveform with phase parameters, and to store a state model relating the phase parameters with a state of the encoder. Wherein the signal model includes a motion-induced polynomial phase signal (PPS) component and a sinusoidal frequency modulated (FM) component. Wherein the PPS component is a polynomial function of the phase parameters, and wherein the FM component is a sinusoidal function of the phase parameters. A processor to determine the phase parameters using non-linear mapping of the phase measurements on the signal model and to determine the state of the encoder by submitting the phase parameters into the state model.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: December 15, 2020
    Assignees: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric Corporation
    Inventors: Pu Wang, Philip Orlik, Kota Sadamoto, Wataru Tsujita
  • Patent number: 10859708
    Abstract: 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: Grant
    Filed: May 10, 2016
    Date of Patent: December 8, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomoaki Takewa, Wataru Tsujita, Yoshitsugu Sawa, Kenji Kataoka, Tadashi Yamamoto, Seiya Nagashima
  • Patent number: 10830885
    Abstract: A parking mode determining system includes a distance measurer to measure a distance to an obstacle on the side of a host vehicle; a host-vehicle position measurer to measure a position of the host vehicle; a reflected position calculator to calculate a reflected position of the transmission wave; a grouping unit to group a plurality of the reflected positions for each obstacle; an angle calculator to obtain an approximate line for each of two or more of the reflected positions adjacent to each other, and calculate an angle of inclination of the approximate line or an angle of inclination of a normal line of the approximate line; and a parking mode determiner to determine whether a parking mode is parallel parking, perpendicular parking, or angle parking on the basis of a distribution of a plurality of the angles of inclination.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: November 10, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Satoru Inoue, Ryotaro Suzuki, Wataru Tsujita, Yoshitsugu Sawa
  • Publication number: 20200324686
    Abstract: An optical axis control apparatus includes an optical axis controlling unit for calculating a pitch angle using output values from an acceleration sensor provided in a vehicle and controlling, using the pitch angle, optical axis angles of headlights provided in the vehicle, during stop of the vehicle; and a rolling motion determination unit for determining, when the vehicle has started traveling, whether there has been a rolling motion during the stop of the vehicle. When the pitch angle has been changed during the stop of the vehicle due to loading or unloading of baggage or a change of passengers, etc., and the rolling motion determination unit determines that the rolling motion exists, the optical axis controlling unit corrects, when the vehicle has started traveling and the rolling motion has been terminated, the changed pitch angle, i.e.
    Type: Application
    Filed: May 31, 2016
    Publication date: October 15, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takao FUKUNAGA, Wataru TSUJITA
  • Patent number: 10789850
    Abstract: A first light projector projects first slit light that spreads in the width direction of a vehicle in a direction other than a direction parallel to a contact ground surface. A second light projector projects second slit light that spreads in the width direction of the vehicle in a direction parallel to the contact ground surface. An obstacle detection unit detects an obstacle using a captured image of an area surrounding the vehicle where the first slit light and the second slit light are projected.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: September 29, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shintaro Watanabe, Shoichi Shimizu, Junji Hori, Wataru Tsujita
  • Publication number: 20200284664
    Abstract: A temperature detection device includes: a detection processing unit configured to transmit a transmission radio wave, simultaneously receive a response radio wave corresponding to the transmission radio wave, and detect whether a temperature of an object to be measured is normal or abnormal based on the response radio wave; and a temperature sensing unit configured to receive the transmission radio wave and transmit the response radio wave responding to the transmission radio wave. The detection processing unit calculates, from the response radio wave received via a second antenna, an amplitude, a phase, or a quadrature phase amplitude of the response radio wave and compares the temperature of the object to be measured to a temperature determined in advance based on a result of the calculation.
    Type: Application
    Filed: November 24, 2017
    Publication date: September 10, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenzo MAKINO, Hideaki ARITA, Masaya INOUE, Junji HORI, Hiroshi ARAKI, Yoshitsugu SAWA, Wataru TSUJITA
  • Publication number: 20200265718
    Abstract: A first light projector projects first slit light that spreads in the width direction of a vehicle in a direction other than a direction parallel to a contact ground surface. A second light projector projects second slit light that spreads in the width direction of the vehicle in a direction parallel to the contact ground surface. An obstacle detection unit detects an obstacle using a captured image of an area surrounding the vehicle where the first slit light and the second slit light are projected.
    Type: Application
    Filed: March 23, 2017
    Publication date: August 20, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shintaro WATANABE, Shoich SHIMIZU, Junji HORI, Wataru TSUJITA
  • Patent number: 10640134
    Abstract: Based on a ratio between Doppler frequencies calculated from a plurality of reception signals outputted by a receiver, a position detector calculates a relative position of a plurality of antennas in a mobile wireless apparatus to a stationary wireless apparatus. A train position detector calculates a position of a train from the calculated relative position, a placement position of the stationary wireless apparatus and placement positions in the train of the plurality of antennas.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: May 5, 2020
    Assignee: Misubishi Electric Corporation
    Inventors: Wataru Tsujita, Kenji Inomata, Seiya Nagashima, Kazuhiro Tahara
  • Publication number: 20200130717
    Abstract: A rail state monitoring apparatus (1) includes: first and second transmission antennas (101, 102) to transmit first and second electric signals to rails (5, 6), respectively; first reception antenna (201) to receive a surface wave (21) of the first electric signal propagated through rail (5) and guided wave (32) of the second electric signal propagated through loop coil (10); second reception antenna (202) to receive surface wave (22) of the second electric signal propagated through rail (6) and guided wave (31) of the first electric signal propagated through loop coil (10); and a processor. The processor obtains received powers of the respective electric signals received by first and second reception antennas (201, 202), determines a rail state from “good”, “rail broken”, “rail crack”, or “rail surface anomaly” based on the received powers, and outputs the rail state as rail state information.
    Type: Application
    Filed: October 24, 2018
    Publication date: April 30, 2020
    Applicants: MITSUBISHI ELECTRIC CORPORATION, MITSUBISHI ELECTRIC RESEARCH LABORATORIES, INC.
    Inventors: Wataru TSUJITA, Kenzo MAKINO, Atsushi TAKAMI, Bingnan WANG
  • Publication number: 20200071124
    Abstract: A movement-distance measuring apparatus is provided with: an antenna, a phase detection circuit, a phase-shift calculation circuit, and a movement-distance calculation circuit. The antenna transmits a radio wave toward a plurality of reflectors arranged at constant intervals along a moving path of a moving object, and receives a reflected wave from the reflectors. The phase detection circuit detects a phase of the reflected wave received by the antenna. The phase-shift calculation circuit calculates a phase shift based on the phase detected by the phase detection circuit. The movement-distance calculation circuit calculates a movement distance of the moving object, based on the phase shift calculated by the phase-shift calculation circuit, and based on the interval of the reflectors.
    Type: Application
    Filed: January 12, 2018
    Publication date: March 5, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroshi TAGUCHI, Kota SADAMOTO, Wataru TSUJITA, Yoshitsugu SAWA, Masahiro ISHIKAWA
  • Publication number: 20200057157
    Abstract: A parking assistance device (100) is provided with distance sensors (2FL, 2FR, 2RL, 2RR) which transmit detection waves laterally with respect to a host vehicle (1) while the host vehicle (1) travels and receive reflected waves of the detection waves, a reflection point calculating unit (11) which calculates a reflection point indicating a position where the detection wave is reflected, a grouping unit (13) which groups the reflection points, a parking space pitch calculating unit (14) which calculates a parking space pitch indicating a width of each parking space by using periodicity of a shape of a reflection point group set by grouping, a parking target area setting unit (15) which sets a parking target area which is a target of perpendicular parking by the host vehicle (1), and a parking assistance controlling unit (21) which guides the host vehicle (1) to the parking target area on the basis of the parking space pitch.
    Type: Application
    Filed: January 18, 2017
    Publication date: February 20, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shinichi HARASE, Satoru INOUE, Ryotaro SUZUKI, Wataru TSUJITA, Yoshitsugu SAWA, Tsutomu ASAHINA
  • Patent number: 10513217
    Abstract: A control unit of an optical axis control device for a headlight calculates a first vehicle angle (??) and a second vehicle angle (??) at different timings in traveling of a vehicle, and calculates a third vehicle angle (?s) at which a difference between acceleration signals in a front-rear direction (?X) is zero. The control unit calculates a representative value (?S) based on a distribution of a plurality of third vehicle angles (?s), and generates a signal for operating an optical axis of the headlight based on the representative value (?S).
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: December 24, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takashi Ohsawa, Wataru Tsujita
  • Patent number: 10501101
    Abstract: A train-position detection device includes: a radio-wave's angle-of-arrival calculator configured to calculate an angle of arrival of a radio wave on the basis of a reception signal received by an array antenna and a receiver; a position acquisition unit configured to acquire information on an installation position of a ground-based wireless communication apparatus from the reception signal; a train-position calculator configured to calculate a train position on the basis of a movement distance of a train; a correction-amount-to-train-position calculator configured to calculate a train-position correction amount, by using the calculated angle of arrival, the installation position of the ground-based wireless communication apparatus acquired by the position acquisition unit, and the calculated train position; and a train-position correcting unit configured to correct the calculated train position by using the train-position correction amount calculated by the correction-amount-to-train-position calculator.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: December 10, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Wataru Tsujita, Seiya Nagashima, Tadashi Yamamoto, Kazuhiro Tahara, Kenji Kataoka
  • Publication number: 20190351923
    Abstract: 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: Application
    Filed: January 13, 2017
    Publication date: November 21, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Daisuke KOSHINO, Masashi ASUKA, Wataru TSUJITA, Tomoaki TAKEWA, Yoshitsugu SAWA
  • Patent number: 10471885
    Abstract: A headlight optical axis control apparatus calculates an inclination angle of a vehicle with respect to a road surface from a ratio of a difference between acceleration signals in the front-and-rear direction measured at two time points (kn, kn+1) to a difference between acceleration signals in the up-and-down direction measured at the two time points (kn, kn+1), the two time points being in the vicinity of a time when the attitude of a vehicle body becomes equivalent to a stationary state, in a period from a time when the travelling vehicle stops to a time when the vehicle body comes to a halt.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: November 12, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takashi Ohsawa, Wataru Tsujita
  • Patent number: 10471884
    Abstract: In a headlight optical-axis control device 10, a controller 15 is configured to: calculate vehicle angles indicating tilt angles of a vehicle relative to a road surface, on the basis of ratios, each being a ratio of a difference between a reference acceleration in a longitudinal direction and a signal indicating an acceleration in the longitudinal direction detected during traveling of the vehicle, to a difference between a reference acceleration in a perpendicular direction and a signal indicating an acceleration in the perpendicular direction detected during traveling of the vehicle by an acceleration sensor 2; calculate a plot of the calculated vehicle angles thereby to derive a vehicle angle corresponding to a case where a change of the acceleration in the longitudinal direction is zero; and generate a signal for controlling the optical axes of headlights 5L and 5R on the basis of the derived vehicle angle.
    Type: Grant
    Filed: September 16, 2014
    Date of Patent: November 12, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Mitsuaki Akaza, Toshiyuki Yamashita, Takashi Ohsawa, Wataru Tsujita, Takahiko Ito