Patents by Inventor Takashi Nakagami

Takashi Nakagami 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: 11936370
    Abstract: A protection device is capable of protecting a load drive system at an appropriate timing according to a temperature of a power semiconductor. The protection device includes: a capacitor configured to output a voltage according to a charge accumulated by a first current; and a protection circuit configured to: (i) determine whether or not the voltage output by the capacitor exceeds a certain threshold value; (ii) generate a second current having a magnitude according to information related to the temperature of the power semiconductor which drives a load; and (iii) change a magnitude of the first current based on the second current.
    Type: Grant
    Filed: May 12, 2022
    Date of Patent: March 19, 2024
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Yusuke Yoshino, Takashi Nakagami, Ryo Iida
  • Publication number: 20220368323
    Abstract: There is provided a protection device capable of protecting a load drive system at an appropriate timing according to the temperature of a power semiconductor. A protection device includes: a capacitor that outputs a voltage according to a charge accumulated by a first current; and a protection circuit that determines whether or not the voltage output by the capacitor exceeds a certain threshold value, generates a second current having a magnitude according to information related to the temperature of a power semiconductor which drives a load, and changes the magnitude of the first current based on the generated second current.
    Type: Application
    Filed: May 12, 2022
    Publication date: November 17, 2022
    Inventors: Yusuke YOSHINO, Takashi NAKAGAMI, Ryo IIDA
  • Patent number: 11440539
    Abstract: A vehicle control device includes an oncoming vehicle detection sensor that detects an oncoming vehicle approaching an own vehicle; and a controller configured to automatically apply brakes to the own vehicle to avoid a collision with the oncoming vehicle, detected by the oncoming vehicle detection sensor, under a condition that the own vehicle is at least partially in an opposite lane or a planned path of the own vehicle is at least partially in the opposite lane. The controller is further configured to set, between the own vehicle and the oncoming vehicle, a virtual area that moves with the oncoming vehicle and that extends toward the own vehicle using a rear end of the oncoming vehicle as a base point, and automatically brake the own vehicle to avoid the own vehicle coming into contact with the virtual area to avoid the collision between the own vehicle and the oncoming vehicle.
    Type: Grant
    Filed: March 16, 2020
    Date of Patent: September 13, 2022
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Hiroshi Ohmura, Takashi Nakagami, Xi Chen
  • Patent number: 11318934
    Abstract: A vehicle control device includes an oncoming vehicle detection sensor and a controller that automatically applies brakes to avoid a collision with the oncoming vehicle, under a condition that the own vehicle is at least partially in an opposite lane or a planned path of the own vehicle is at least partially in the opposite lane. The controller sets a virtual area that moves with the oncoming vehicle and that extends in an advancing direction of the oncoming vehicle, and automatically brakes to avoid to avoid a collision. In response to the sensor detecting first and second oncoming vehicles, the controller sets first and second virtual areas, and automatically brakes the own vehicle to prevent coming into contact with the first virtual area and the second virtual area once the own vehicle traverses the opposite lane.
    Type: Grant
    Filed: March 16, 2020
    Date of Patent: May 3, 2022
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Hiroshi Ohmura, Takashi Nakagami, Xi Chen
  • Patent number: 11104348
    Abstract: A line-of-sight determination unit of a vehicle alarm apparatus determines the line-of-sight direction, based on a face orientation and a pupil that are included in a captured image of a driver. A driving operation detection unit detects a requested acceleration based on an accelerator operation of the driver, or a turn-signal-lamp switch operation for activating a turn signal lamp of a vehicle. A controller sets an alarm timing, based on an output of the line-of-sight determination unit and an output of the driving operation detection unit. When the requested acceleration that is equal to or more than a predetermined acceleration, or the turn-signal-lamp switch operation is detected, the controller activates an alarm device at a timing more delayed than the alarm timing.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: August 31, 2021
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Xi Chen, Takashi Nakagami, Shota Katayama, Rie Tezuka
  • Publication number: 20210237720
    Abstract: An AEB controller is configured to operate AEB if a laser radar detects an obstacle ahead, and stops operating the AEB if an accelerator pedal sensor detects an accelerator operation equal to or larger than a first operating amount. A PTC controller is configured to operate PTC in which engine power of an own vehicle is reduced and PTC autonomous braking is performed, if the obstacle ahead is detected and the accelerator operation equal to or larger than a second operating amount which is smaller than the first operating amount is detected, in a state where a vehicle speed detected by a vehicle speed sensor is within a predetermined vehicle speed range. An adjuster is configured to prioritize the PTC autonomous braking when an operating condition for the PTC autonomous braking and a stop condition for the AEB are both satisfied.
    Type: Application
    Filed: January 29, 2019
    Publication date: August 5, 2021
    Inventors: Xi CHEN, Takashi NAKAGAMI, Shota KATAYAMA, Rie TEZUKA
  • Publication number: 20210237719
    Abstract: A brake controller operates PTC when an obstacle sensor detects an obstacle ahead, a vehicle speed sensor detects a vehicle speed equal to or lower than a predetermined vehicle speed, and an operation of an accelerator pedal equal to or greater than a predetermined depression amount is detected. When detection of the obstacle ahead is lost while the PTC is operating and the PTC is to be cancelled, the brake controller operates a power limiting control if a depression operation of the accelerator pedal is detected. The power limiting control limits an engine power to cause acceleration to be lower than a requested acceleration corresponding to a depression amount of the accelerator pedal.
    Type: Application
    Filed: January 29, 2019
    Publication date: August 5, 2021
    Inventors: Xi CHEN, Takashi NAKAGAMI, Shota KATAYAMA, Rie TEZUKA
  • Publication number: 20210213918
    Abstract: A brake assist controller determines that an operating condition for a brake assist control is satisfied if time to collision (TTC) calculated by dividing an inter-vehicle gap by a relative speed is equal to or smaller than a reference time to collision (reference TTC), and if the TTC is larger than the reference TTC, the brake assist controller determines that the operating condition for the brake assist control is satisfied if a time headway calculated by dividing the inter-vehicle gap by a vehicle speed of an own vehicle is equal to or smaller than a reference time headway.
    Type: Application
    Filed: January 29, 2019
    Publication date: July 15, 2021
    Inventors: Xi CHEN, Hiroshi OHMURA, Takashi NAKAGAMI, Shota KATAYAMA, Rie TEZUKA
  • Publication number: 20210188262
    Abstract: Disclosed is a vehicle control device which includes: a surrounding object detection part; a target traveling course calculation part; and a corrected traveling course calculation part, wherein the corrected traveling course calculation part is configured to, when a surrounding object to be avoided is detected by the surrounding object detection part, set an upper limit line of a permissible relative speed at which the own vehicle is permitted to travel with respect to the surrounding object, and derive the corrected traveling course, based on the upper limit line, a given evaluation function, and a given limiting condition, and wherein the corrected traveling course calculation part has, as the limiting condition, a region outside the width of the own vehicle whose middle is coincident with an estimated traveling course set on the assumption that a current driving state based on the intent of the driver is continued.
    Type: Application
    Filed: October 16, 2018
    Publication date: June 24, 2021
    Inventors: Takashi GOTO, Kenta TADA, Hiroshi OHMURA, Kouji HOSODA, Tetsuya TACHIHATA, Takashi NAKAGAMI, Yuma NISHIJO, Yasuhiro KAWAHARA, Shota KATAYAMA, Shoji HARADA, Yuki YAMAMOTO
  • Publication number: 20210188356
    Abstract: Disclosed is a vehicle control device which includes: a surrounding object detection part; a target traveling course calculation part; a corrected traveling course calculation part; and an automatic steering control part to assist in traveling in the lane, wherein: the corrected traveling course calculation part is configured to set an upper limit line of a permissible relative speed with respect to the surrounding object, and derive the corrected traveling course, based on the upper limit line, an evaluation function, and a limiting condition; and the target traveling course calculation part is configured to, when it is determined by the automatic steering control part that there is a possibility of a vehicle deviates from the lane, set the target traveling course at a position offset, with respect to a widthwise middle of the lane, on a side on which there is the possibility of the deviation.
    Type: Application
    Filed: October 16, 2018
    Publication date: June 24, 2021
    Inventors: Takashi GOTO, Kenta TADA, Hiroshi OHMURA, Kouji HOSODA, Tetsuya TACHIHATA, Takashi NAKAGAMI, Yuma NISHIJO, Yasuhiro KAWAHARA, Shota KATAYAMA, Shoji HARADA, Yuki YAMAMOTO, Soichiro FUKUI, Kazunori ISOMOTO, Akira SUZUKI
  • Publication number: 20210188258
    Abstract: Disclosed is a vehicle control device which includes: a surrounding object detection part; a target traveling course calculation part; and a corrected traveling course calculation part, wherein the corrected traveling course calculation part is configured to, when a surrounding object to be avoided is detected, set an upper limit line of a permissible relative speed at which the own vehicle is permitted to travel with respect to the surrounding object, and derive the corrected traveling course, based on the upper limit line, a given evaluation function, and a given limiting condition, and wherein the corrected traveling course calculation part has, as the limiting condition, a region outside the width of the own vehicle whose middle is coincident with an estimated traveling course set on an assumption that the own vehicle travels along a traveling trajectory of the preceding vehicle detected by the surrounding object detection part.
    Type: Application
    Filed: October 16, 2018
    Publication date: June 24, 2021
    Inventors: Takashi GOTO, Kenta TADA, Hiroshi OHMURA, Kouji HOSODA, Tetsuya TACHIHATA, Takashi NAKAGAMI, Yuma NISHIJO, Yasuhiro KAWAHARA, Shota KATAYAMA, Shoji HARADA, Yuki YAMAMOTO
  • Publication number: 20210024076
    Abstract: A line-of-sight determination unit of a vehicle alarm apparatus determines the line-of-sight direction, based on a face orientation and a pupil that are included in a captured image of a driver. A driving operation detection unit detects a requested acceleration based on an accelerator operation of the driver, or a turn-signal-lamp switch operation for activating a turn signal lamp of a vehicle. A controller sets an alarm timing, based on an output of the line-of-sight determination unit and an output of the driving operation detection unit. When the requested acceleration that is equal to or more than a predetermined acceleration, or the turn-signal-lamp switch operation is detected, the controller activates an alarm device at a timing more delayed than the alarm timing.
    Type: Application
    Filed: March 8, 2019
    Publication date: January 28, 2021
    Applicant: Mazda Motor Corporation
    Inventors: Xi CHEN, Takashi NAKAGAMI, Shota KATAYAMA, Rie TEZUKA
  • Publication number: 20200353918
    Abstract: Disclosed is a vehicle control device which comprises a traveling course control part 10a to update a target traveling course R, and an automatic anti-collision control part 10b to execute automatic anti-collision control processing (S14) for avoiding collision with an obstacle. The part 10a corrects the target traveling course R to calculate corrected traveling course candidates for avoiding the obstacle, and evaluates the corrected traveling course candidates by an evaluation function J to select one of the candidates as a corrected traveling course. The part 10a generates a first request signal for a brake control system 32 to allow the vehicle 1 to travel along the corrected traveling course. The part 10b generates a second request signal for the brake control system 32. The vehicle control device further comprises an output control part 10d to output the first or second request signal to the brake control system 32.
    Type: Application
    Filed: August 23, 2018
    Publication date: November 12, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Takashi GOTO, Hiroshi OHMURA, Kouji HOSODA, Tetsuya TACHIHATA, Takashi NAKAGAMI, Yuma NISHIJO, Yasuhiro KAWAHARA, Shota KATAYAMA
  • Publication number: 20200331467
    Abstract: A vehicle control device includes an oncoming vehicle detection sensor and a controller that automatically applies brakes to avoid a collision with the oncoming vehicle, under a condition that the own vehicle is at least partially in an opposite lane or a planned path of the own vehicle is at least partially in the opposite lane. The controller sets a virtual area that moves with the oncoming vehicle and that extends in an advancing direction of the oncoming vehicle, and automatically brakes to avoid to avoid a collision. In response to the sensor detecting first and second oncoming vehicles, the controller sets first and second virtual areas, and automatically brakes the own vehicle to prevent coming into contact with the first virtual area and the second virtual area once the own vehicle traverses the opposite lane.
    Type: Application
    Filed: March 16, 2020
    Publication date: October 22, 2020
    Applicant: Mazda Motor Corporation
    Inventors: Hiroshi OHMURA, Takashi NAKAGAMI, Xi CHEN
  • Publication number: 20200331468
    Abstract: A vehicle control device includes an oncoming vehicle detection sensor that detects an oncoming vehicle approaching an own vehicle; and a controller configured to automatically apply brakes to the own vehicle to avoid a collision with the oncoming vehicle, detected by the oncoming vehicle detection sensor, under a condition that the own vehicle is at least partially in an opposite lane or a planned path of the own vehicle is at least partially in the opposite lane. The controller is further configured to set, between the own vehicle and the oncoming vehicle, a virtual area that moves with the oncoming vehicle and that extends toward the own vehicle using a rear end of the oncoming vehicle as a base point, and automatically brake the own vehicle to avoid the own vehicle coming into contact with the virtual area to avoid the collision between the own vehicle and the oncoming vehicle.
    Type: Application
    Filed: March 16, 2020
    Publication date: October 22, 2020
    Applicant: Mazda Motor Corporation
    Inventors: Hiroshi OHMURA, Takashi NAKAGAMI, Xi CHEN
  • Publication number: 20200238980
    Abstract: Disclosed is a vehicle control device which comprises a traveling course control part 10a to update a target traveling course R, and an automatic emergency avoidance control part (10b, 10e) to execute automatic emergency avoidance control processing for automatically operating a given control system to avoid collision with an obstacle. The part 10a corrects the target traveling course R to calculate plural corrected traveling course candidates for avoiding the obstacle, and evaluates the candidates by an evaluation function J to select one of the candidates as a corrected traveling course. The part 10a generates a first request signal for allowing the vehicle 1 to travel along the corrected traveling course. The emergency avoidance course control part (10b, 10e) generates a second request signal. The vehicle control device further comprises an output control part 10d to output the first or second request signal to the given control system.
    Type: Application
    Filed: August 23, 2018
    Publication date: July 30, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Takashi GOTO, Hiroshi OHMURA, Kouji HOSODA, Tetsuya TACHIHATA, Takashi NAKAGAMI, Yuma NISHIJO, Yasuhiro KAWAHARA, Shota KATAYAMA
  • Publication number: 20200180614
    Abstract: Provided is a vehicle control device (ECU) 10 which comprises a target traveling course calculation part 10a to calculate a target traveling course R of a vehicle 1, wherein the target traveling course calculation part 10a is configured to, upon detection of an obstacle, correct the target traveling course R so as to avoid the obstacle (S14). The target traveling course calculation part 10a is configured to, in the traveling course correction processing, correct the target traveling course R to calculate corrected traveling course candidate for avoiding the obstacle; and evaluate the corrected traveling course candidates with respect to the target traveling course R by an evaluation function J including evaluation factors, to derive one corrected traveling course according to the evaluation. The target traveling course calculation part 10a is configured to revise the evaluation factors based on an external signal.
    Type: Application
    Filed: August 23, 2018
    Publication date: June 11, 2020
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Takashi GOTO, Hiroshi OHMURA, Kouji HOSODA, Tetsuya TACHIHATA, Takashi NAKAGAMI, Yuma NISHIJO, Yasuhiro KAWAHARA, Shota KATAYAMA
  • Patent number: 10673348
    Abstract: To improve the accuracy of detecting a current flowing through an electric compressor after operation of the electric compressor, the electric compressor having a large change in temperature before and after operation. An inverter-integrated electric compressor (1) that compresses and discharges a refrigerant suctioned therein, includes an inverter device (2) provided with a circuit board (60) mounted with an inverter circuit (40), the inverter device (2) being integrally incorporated in an inverter case. The circuit board (60) is provided with a current detection circuit (30) that detects an input current flowing through the inverter circuit (40), and an offset correction circuit (20). The current detection circuit (30) includes a shunt resistor (32) that is serially connected to the inverter circuit (40) and detects a current, and a first amplifier (31) that amplifies and outputs a voltage appearing as a voltage drop in the shunt resistor (32).
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: June 2, 2020
    Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
    Inventors: Masato Ito, Kenichi Aiba, Takashi Nakagami, Kyohei Watanabe, Naoki Nishikawa, Katsuhiro Saito, Kenji Shimizu
  • Patent number: 10662946
    Abstract: This electric compressor includes a compressor which rotates to compress a fluid, a motor which rotatably drives the compressor, and a control unit which controls current supply to the motor using first and second components. An allowable current for first and second components exposed to the same temperature is set to be smaller in the second component than in the first component. The second component is disposed at a place in which cooling capability is greater than that of the first component so that allowable power of the second component at rated use is greater than allowable power of the first component. This electric compressor includes a temperature sensor which detects the temperature of the first component and a calculation unit which outputs an alarm signal when the detected temperature and a current flowing in the first component satisfy a predetermined condition.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: May 26, 2020
    Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
    Inventors: Takashi Nakagami, Takayuki Takashige
  • Patent number: 10608547
    Abstract: To improve the accuracy of detecting a current flowing through an electric compressor after operation of the electric compressor, the electric compressor having a large change in temperature before and after operation. An inverter-integrated electric compressor (1) that compresses and discharges a refrigerant suctioned therein, includes an inverter device (2) provided with a circuit board (60) mounted with an inverter circuit (40), the inverter device (2) being integrally incorporated in an inverter case. The circuit board (60) is provided with a current detection circuit (30) that detects an input current flowing through the inverter circuit (40), and an offset correction circuit (20). The current detection circuit (30) includes a shunt resistor (32) that is serially connected to the inverter circuit (40) and detects a current, and a first amplifier (31) that amplifies and outputs a voltage appearing as a voltage drop in the shunt resistor (32).
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: March 31, 2020
    Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
    Inventors: Masato Ito, Kenichi Aiba, Takashi Nakagami, Kyohei Watanabe, Naoki Nishikawa, Katsuhiro Saito, Kenji Shimizu