Patents by Inventor Ken OKAHARA

Ken OKAHARA 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: 10989301
    Abstract: A controller constitutes a control device for continuously variable transmission for executing a feedback control of a transmission so that an actual speed ratio reaches a target speed ratio. The controller includes a first phase lead compensator and a second phase lead compensator configured to perform phase lead compensation of a feedback primary command pressure, and a peak value frequency determination unit configured to change a peak value frequency according to a speed ratio.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: April 27, 2021
    Assignee: JATCO LTD
    Inventors: Ken Okahara, Kazutaka Adachi, Yutaka Kaneko, Kenichi Mori
  • Publication number: 20210025492
    Abstract: A continuously variable transmission has a variator (4) structured to be able to continuously vary a transmission ratio and a control unit (100). The control unit (100) continuously varies a transmission ratio of the variator (4) in a continuously variable shift mode. In a manual mode in which a manual mode switch (36c) is ON, the transmission ratio is maintained. When a shift switch (36a, 36b) is operated by a driver during the manual mode, the control unit (100) performs shift of the variator (4) so as to change an input rotation speed of the variator (4) by a predetermined rotation speed (?N1) regardless of a vehicle speed.
    Type: Application
    Filed: February 28, 2019
    Publication date: January 28, 2021
    Applicant: JATCO Ltd
    Inventors: Ken OKAHARA, Atsushi SHIMADA
  • Patent number: 10871224
    Abstract: A controller executes a feedback control of a transmission so that an actual speed ratio reaches a target speed ratio. The controller includes first and second phase lead compensators configured to perform phase lead compensation of a feedback primary command pressure, a lead compensation on/off determination unit configured to determine to set on or off the phase lead compensation, and an advance amount filter unit configured to smooth a change of a gain according to on/off determination of the phase lead compensation when the phase lead compensation is on/off-switched.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: December 22, 2020
    Assignee: JATCO LTD
    Inventor: Ken Okahara
  • Patent number: 10837551
    Abstract: A control method of a continuously variable transmission mounted on a vehicle includes performing advance compensation in a speed ratio control system of the continuously variable transmission, and making an advance amount according to a vibration frequency of torsional vibration of an input shaft of the continuously variable transmission which is the advance amount of the advance compensation variable in accordance with an operation state of the vehicle. A feedback gain of speed ratio control of the continuously variable transmission performed in the speed ratio control system is variable in accordance with an operation state of the vehicle. When the advance amount is made variable, the advance amount is made variable in accordance with the feedback gain.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: November 17, 2020
    Assignees: Nissan Motor Co., Ltd., JATCO Ltd
    Inventors: Soojung Hong, Kenichi Mori, Yutaka Kaneko, Kazutaka Adachi, Ken Okahara, Masayuki Miyazono
  • Publication number: 20200248798
    Abstract: A control device for a continuously variable transmission performs feedback control so that an actual transmission control value becomes a target transmission control value. The control device for a continuously variable transmission includes a phase lead compensation unit configured to perform phase lead compensation of the feedback control, a phase delay compensation unit configured to perform phase delay compensation of the feedback control, and a phase compensation on/off determination unit configured to stop the phase delay compensation by the phase delay compensation unit when an unstable traveling state of a vehicle is detected, and to restore the phase delay compensation when a traveling state of the vehicle has changed.
    Type: Application
    Filed: September 11, 2018
    Publication date: August 6, 2020
    Inventor: Ken OKAHARA
  • Publication number: 20200248799
    Abstract: A control device for a continuously variable transmission mounted in a vehicle, includes a lead compensation unit and a delay compensation unit. The lead compensation unit is configured to perform phase lead compensation in a transmission ratio control system of the continuously variable transmission according to an operating state of the vehicle with a lead amount being variable according to a vibration frequency of a torsional vibration of an input shaft of the continuously variable transmission. The delay compensation unit is configured to perform phase delay compensation in the transmission ratio control system with a delay amount being variable according to the operating state of the vehicle.
    Type: Application
    Filed: September 4, 2018
    Publication date: August 6, 2020
    Inventor: Ken OKAHARA
  • Publication number: 20200248800
    Abstract: A control device for a continuously variable transmission performs feedback control so that an actual transmission control value becomes a target transmission control value. The control device includes a phase lead compensation unit configured to perform phase lead compensation of the feedback control, a phase delay compensation unit configured to perform phase delay compensation of the feedback control, a first peak value frequency determination unit configured to change a peak value frequency of the phase lead compensation according to a transmission ratio of the continuously variable transmission, and a second peak value frequency determination unit configured to change a peak value frequency of the phase delay compensation based on the peak value frequency of the lead compensation.
    Type: Application
    Filed: September 4, 2018
    Publication date: August 6, 2020
    Inventor: Ken OKAHARA
  • Publication number: 20200248801
    Abstract: A control device for a continuously variable transmission performs transmission control so that an actual transmission control value becomes a target transmission control value. The control device includes a lead compensation unit, delay compensation unit, and a setting unit. The lead compensation unit performs lead compensation of the target transmission control value. The delay compensation unit performs delay compensation of the target transmission control value. The setting unit is configured to set as the target transmission control value a post-compensation target transmission control value for which compensation is performed by the lead compensation unit and the delay compensation unit according to at least one of an input side rotation speed of the continuously variable transmission, an input torque to a driven side rotation element of the continuously variable transmission, a transmission ratio of the continuously variable transmission, and a rate of change of the transmission ratio.
    Type: Application
    Filed: September 11, 2018
    Publication date: August 6, 2020
    Inventor: Ken OKAHARA
  • Patent number: 10731757
    Abstract: The controller performs shift control of the transmission such that an actual pressure of a primary pressure becomes an indicating pressure. The controller includes a phase advance compensator which performs advance compensation of the indicating pressure, and a setting unit which sets an indicating pressure on which the advance compensation is performed by the phase advance compensator as the indicating pressure, in accordance with at least one of a rotation speed of a primary pulley, an input torque to a secondary pulley, a speed ratio, or a changing rate.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: August 4, 2020
    Assignee: JATCO LTD
    Inventors: Takurou Kawasumi, Ken Okahara, Midori Yamaguchi, Masahiro Yamamoto, Hiroki Iwasa, Hiroki Kumashiro, Masayuki Shimizu, Ryuuichi Furukawa, Kenichi Mori, Kazutaka Adachi, Yutaka Kaneko, Hiroyuki Ashizawa
  • Publication number: 20190226580
    Abstract: A control method of a continuously variable transmission mounted on a vehicle includes performing advance compensation in a speed ratio control system of the continuously variable transmission, and making an advance amount according to a vibration frequency of torsional vibration of an input shaft of the continuously variable transmission which is the advance amount of the advance compensation variable in accordance with an operation state of the vehicle. A feedback gain of speed ratio control of the continuously variable transmission performed in the speed ratio control system is variable in accordance with an operation state of the vehicle. When the advance amount is made variable, the advance amount is made variable in accordance with the feedback gain.
    Type: Application
    Filed: August 1, 2017
    Publication date: July 25, 2019
    Applicants: Nissan Motor Co., Ltd., JATCO Ltd
    Inventors: Soojung Hong, Kenichi Mori, Yutaka Kaneko, Kazutaka Adachi, Ken Okahara, Masayuki Miyazono
  • Publication number: 20190154146
    Abstract: A controller executes a feedback control of a transmission so that an actual speed ratio reaches a target speed ratio. The controller includes first and second phase lead compensators configured to perform phase lead compensation of a feedback primary command pressure, a lead compensation on/off determination unit configured to determine to set on or off the phase lead compensation, and an advance amount filter unit configured to smooth a change of a gain according to on/off determination of the phase lead compensation when the phase lead compensation is on/off-switched.
    Type: Application
    Filed: February 23, 2017
    Publication date: May 23, 2019
    Applicant: JATCO Ltd
    Inventor: Ken OKAHARA
  • Publication number: 20190093764
    Abstract: A controller constitutes a control device for continuously variable transmission for executing a feedback control of a transmission so that an actual speed ratio reaches a target speed ratio. The controller includes a first phase lead compensator and a second phase lead compensator configured to perform phase lead compensation of a feedback primary command pressure, and a peak value frequency determination unit configured to change a peak value frequency according to a speed ratio.
    Type: Application
    Filed: February 23, 2017
    Publication date: March 28, 2019
    Applicant: JATCO Ltd
    Inventors: Ken OKAHARA, Kazutaka ADACHI, Yutaka KANEKO, Kenichi MORI
  • Publication number: 20190078685
    Abstract: The controller performs shift control of the transmission such that an actual pressure of a primary pressure becomes an indicating pressure. The controller includes a phase advance compensator which performs advance compensation of the indicating pressure, and a setting unit which sets an indicating pressure on which the advance compensation is performed by the phase advance compensator as the indicating pressure, in accordance with at least one of a rotation speed of a primary pulley, an input torque to a secondary pulley, a speed ratio, or a changing rate.
    Type: Application
    Filed: February 27, 2017
    Publication date: March 14, 2019
    Applicant: JATCO Ltd
    Inventors: Takurou KAWASUMI, Ken OKAHARA, Midori YAMAGUCHI, Masahiro YAMAMOTO, Hiroki IWASA, Hiroki KUMASHIRO, Masayuki SHIMIZU, Ryuuichi FURUKAWA, Kenichi MORI, Kazutaka ADACHI, Yutaka KANEKO, Hiroyuki ASHIZAWA
  • Publication number: 20190063593
    Abstract: A control device for an automatic transmission includes a continuously variable transmission mechanism, a torque converter, a target transmission ratio calculation unit, a feedback control unit, and a phase compensation unit. The torque converter has a lock-up clutch. The target transmission ratio calculation unit is configured to calculate a target transmission ratio based on a travelling state. The feedback control unit is configured to perform feedback control based on an actual value indicative of a state of the continuously variable transmission mechanism. The phase compensation unit is configured to perform phase lead compensation of the feedback control based on the travelling state. The phase compensation control unit is configured to halt the phase lead compensation when an unstable travelling state of a vehicle is detected. The phase compensation control unit is further configured to release the lock-up clutch when the phase lead compensation is halted.
    Type: Application
    Filed: February 17, 2017
    Publication date: February 28, 2019
    Inventors: Ken OKAHARA, Hiroyasu TANAKA