Patents by Inventor Kuninori KUMAGAI

Kuninori KUMAGAI 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: 11524577
    Abstract: A vehicle control system configured to reduce physical stress on a driver to operate an accelerator pedal without reducing acceleration feel. The vehicle control system selects a first driving force property if an estimated stress on an ankle is less than a threshold value, and selects a second driving force property if the estimated stress on the ankle is greater than the threshold value to reduce the stress on the ankle. When the second driving force property is selected, a target driving force is reduced less than a target driving force calculated based on the first driving force property. In this case, the vehicle control system reduces a difference between: a ratio of acceleration to a pedal force given that the first driving force property is selected; and a ratio of acceleration to the pedal force given that the second driving force property is selected.
    Type: Grant
    Filed: March 24, 2022
    Date of Patent: December 13, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuki Mizukami, Kuninori Kumagai, Satoshi Yamanaka, Kazumi Hoshiya
  • Publication number: 20220340006
    Abstract: A vehicle control system configured to reduce physical stress on a driver to operate an accelerator pedal without reducing acceleration feel. The vehicle control system selects a first driving force property if an estimated stress on an ankle is less than a threshold value, and selects a second driving force property if the estimated stress on the ankle is greater than the threshold value to reduce the stress on the ankle. When the second driving force property is selected, a target driving force is reduced less than a target driving force calculated based on the first driving force property. In this case, the vehicle control system reduces a difference between: a ratio of acceleration to a pedal force given that the first driving force property is selected; and a ratio of acceleration to the pedal force given that the second driving force property is selected.
    Type: Application
    Filed: March 24, 2022
    Publication date: October 27, 2022
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuki MIZUKAMI, Kuninori KUMAGAI, Satoshi YAMANAKA, Kazumi HOSHIYA
  • Publication number: 20220274615
    Abstract: A drive force control system controls acceleration of a vehicle accurately in line with an operation of an accelerator pedal to improve an acceleration feel. A controller calculates a corrected target acceleration when a required acceleration is large and an operating speed of the accelerator pedal is fast, and converts the corrected target acceleration into a target driving force to propel the vehicle so as to achieve the corrected target acceleration by generating the target driving force.
    Type: Application
    Filed: January 26, 2022
    Publication date: September 1, 2022
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kuninori KUMAGAI, Satoshi YAMANAKA, Hiromitsu METSUGI
  • Publication number: 20200309042
    Abstract: A driving force control apparatus for a vehicle includes an operation amount detection unit; a vehicle speed detection unit; and an electronic control unit. The electronic control unit is configured to determine, when a vehicle speed is lower than a predetermined vehicle speed, a target driving force in a case where an operation amount of an accelerator pedal is in a predetermined range, based on a first provisional target driving force; and determine, when the vehicle speed is equal to or higher than the predetermined vehicle speed, the target driving force in the case where the operation amount of the accelerator pedal is in the predetermined range, based on a second provisional target driving force.
    Type: Application
    Filed: March 20, 2020
    Publication date: October 1, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki Otsubo, Kuninori Kumagai, Hiromitsu Metsugi, Daijiro Kawasaki
  • Patent number: 9994224
    Abstract: A shift control system that reduces drop in driving force and shocks during execution of clutch-to-clutch upshifting is provided. The control system is configured to reduce a torque transmitting capacity of a first clutch at a predetermined rate while increasing a torque transmitting capacity of a second clutch with a reduction in the torque transmitting capacity of the first clutch during execution of the upshifting, to set a target speed of the engine to a level determined by adding a predetermined speed to a synchronous engine speed corresponding to a low speed stage, during a torque phase in which the torque transmitting capacity of the first clutch is being reduced and the torque transmitting capacity of the second clutch is being increased, and to execute a feedback control of an engine torque in such a manner as to maintain the engine speed to the target speed based on a difference between the target speed and an actual engine speed.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: June 12, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideo Watanabe, Naoto Moriya, Kuninori Kumagai, Junya Mizuno
  • Publication number: 20170144667
    Abstract: A shift control system that reduces drop in driving force and shocks during execution of clutch-to-clutch upshifting is provided. The control system is configured to reduce a torque transmitting capacity of a first clutch at a predetermined rate while increasing a torque transmitting capacity of a second clutch with a reduction in the torque transmitting capacity of the first clutch during execution of the upshifting, to set a target speed of the engine to a level determined by adding a predetermined speed to a synchronous engine speed corresponding to a low speed stage, during a torque phase in which the torque transmitting capacity of the first clutch is being reduced and the torque transmitting capacity of the second clutch is being increased, and to execute a feedback control of an engine torque in such a manner as to maintain the engine speed to the target speed based on a difference between the target speed and an actual engine speed.
    Type: Application
    Filed: October 28, 2016
    Publication date: May 25, 2017
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideo WATANABE, Naoto MORIYA, Kuninori KUMAGAI, Junya MIZUNO