Patents by Inventor Takuro Kawasumi

Takuro Kawasumi 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: 10663058
    Abstract: A vehicle sailing stop control method is provided for a vehicle including a friction engagement element disposed between a traveling drive source and drive wheels, a torque converter disposed between the friction engagement element and the traveling drive source, and including a lock-up clutch for which a power transmission amount is controlled based on hydraulic pressure, and a hydraulic pressure source that can supply the hydraulic pressure while the traveling drive source is stopped. The vehicle sailing stop control method includes: performing sailing stop control so that coasting is performed by cutting off power transmission of the friction engagement element and stopping the traveling drive source upon a sailing stop travel condition being established; and, during coasting by the sailing stop control, placing the lock-up clutch in a power transmission state in which the hydraulic pressure is applied to the lock-up clutch.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: May 26, 2020
    Assignee: Jatco Ltd.
    Inventors: Takuro Kawasumi, Masayoshi Nakasaki, Yoshimasa Nishihiro, Yukifumi Ootsuka, Yusuke Ota, Yusuke Nakano
  • Patent number: 10501083
    Abstract: A vehicle control device includes control means for executing coasting control, in which a friction engaging element is disengaged and a rotation speed of a rotary shaft of a drive source is set at zero, when a shift range corresponds to a travel range and a coasting condition is established, and the control means executes the coasting control when the shift range is modified to a neutral range.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: December 10, 2019
    Assignee: JATCO LTD
    Inventors: Yusuke Nakano, Yusuke Ota, Yoshimasa Nishihiro, Masayoshi Nakasaki, Yukifumi Ootsuka, Takuro Kawasumi, Shintaro Oshio
  • Patent number: 10214214
    Abstract: A vehicle control device includes control means for executing coasting control to disengage a friction engaging element and set a rotation speed of a rotary shaft of a drive source at zero when a predetermined condition is established, the predetermined condition including at least a condition according to which an accelerator pedal is not depressed. The control means starts the coasting control after predicting that an actual speed ratio of a continuously variable transmission will be modifiable to a target speed ratio of the coasting control during the coasting control, even in a case where the accelerator pedal is not depressed but the actual speed ratio has not yet reached the target speed ratio.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: February 26, 2019
    Assignee: JATCO LTD
    Inventors: Yusuke Nakano, Yusuke Ota, Yoshimasa Nishihiro, Masayoshi Nakasaki, Yukifumi Ootsuka, Takuro Kawasumi, Shintaro Oshio
  • Publication number: 20180245685
    Abstract: A vehicle sailing stop control method is provided for a vehicle including a friction engagement element disposed between a traveling drive source and drive wheels, a torque converter disposed between the friction engagement element and the traveling drive source, and including a lock-up clutch for which a power transmission amount is controlled based on hydraulic pressure, and a hydraulic pressure source that can supply the hydraulic pressure while the traveling drive source is stopped. The vehicle sailing stop control method includes: performing sailing stop control so that coasting is performed by cutting off power transmission of the friction engagement element and stopping the traveling drive source upon a sailing stop travel condition being established; and, during coasting by the sailing stop control, placing the lock-up clutch in a power transmission state in which the hydraulic pressure is applied to the lock-up clutch.
    Type: Application
    Filed: September 1, 2016
    Publication date: August 30, 2018
    Inventors: Takuro KAWASUMI, Masayoshi NAKASAKI, Yoshimasa NISHIHIRO, Yukifumi OOTSUKA, Yusuke OTA, Yusuke NAKANO
  • Publication number: 20180037231
    Abstract: A vehicle control device includes control means for executing coasting control, in which a friction engaging element is disengaged and a rotation speed of a rotary shaft of a drive source is set at zero, when a shift range corresponds to a travel range and a coasting condition is established, and the control means executes the coasting control when the shift range is modified to a neutral range.
    Type: Application
    Filed: February 17, 2016
    Publication date: February 8, 2018
    Applicant: JATCO LTD.
    Inventors: Yusuke NAKANO, Yusuke OTA, Yoshimasa NISHIHIRO, Masayoshi NAKASAKI, Yukifumi OOTSUKA, Takuro KAWASUMI, Shintaro OSHIO
  • Publication number: 20180037229
    Abstract: A vehicle control device includes control means for executing coasting control to disengage a friction engaging element and set a rotation speed of a rotary shaft of a drive source at zero when a predetermined condition is established, the predetermined condition including at least a condition according to which an accelerator pedal is not depressed. The control means starts the coasting control after predicting that an actual speed ratio of a continuously variable transmission will be modifiable to a target speed ratio of the coasting control during the coasting control, even in a case where the accelerator pedal is not depressed but the actual speed ratio has not yet reached the target speed ratio.
    Type: Application
    Filed: February 17, 2016
    Publication date: February 8, 2018
    Applicant: JATCO LTD.
    Inventors: Yusuke NAKANO, Yusuke OTA, Yoshimasa NISHIHIRO, Masayoshi NAKASAKI, Yukifumi OOTSUKA, Takuro KAWASUMI, Shintaro OSHIO
  • Patent number: 8694215
    Abstract: A gear ratio control unit is provided to set a target gear ratio on the basis of an operating condition of the vehicle. The gear ratio control unit controls a drive amount of a step motor such that an actual gear ratio converges with the target gear ratio, and when a deceleration of the vehicle exceeds a predetermined threshold, controls the gear ratio by controlling the drive amount of the step motor such that a predetermined gear ratio is maintained. The gear ratio control unit determines the predetermined threshold on the basis of the actual gear ratio upon detection of an operation of a brake.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: April 8, 2014
    Assignees: Jatco Ltd, Nissan Motor Co., Ltd.
    Inventors: Takuro Kawasumi, Jouji Seki
  • Patent number: 7809485
    Abstract: A shift control apparatus of a CVT installed in a non-ABS equipped vehicle is arranged to estimate a condition of a transmission ratio of the CVT, to prohibit a shift operation of varying the transmission ratio to a high-speed-side transmission ratio relative to a first predetermined transmission ratio when the driving-wheel acceleration is greater than or equal to a predetermined acceleration, and to cancel the prohibition of the shift operation when the transmission ratio is in a high speed side relative to a second transmission ratio under a condition that the driving-wheel acceleration becomes greater than or equal to the predetermined acceleration.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: October 5, 2010
    Assignee: JATCO Ltd
    Inventors: Atsufumi Kobayashi, Tatsuo Ochiai, Takuro Kawasumi
  • Publication number: 20090299588
    Abstract: A gear ratio control unit is provided to set a target gear ratio on the basis of an operating condition of the vehicle. The gear ratio control unit controls a drive amount of a step motor such that an actual gear ratio converges with the target gear ratio, and when a deceleration of the vehicle exceeds a predetermined threshold, controls the gear ratio by controlling the drive amount of the step motor such that a predetermined gear ratio is maintained. The gear ratio control unit determines the predetermined threshold on the basis of the actual gear ratio upon detection of an operation of a brake.
    Type: Application
    Filed: May 22, 2009
    Publication date: December 3, 2009
    Inventors: Takuro KAWASUMI, Jouji Seki
  • Patent number: 7416512
    Abstract: A shift control apparatus for a continuously-variable transmission includes an operating condition sensing section; a normal-time speed ratio determining section; a normal-time control section; a kickdown-acceleration request determining section; a kickdown-acceleration-time control section; and an accelerator-operation-quantity variation-rate limiting section. The kickdown-acceleration-time control section is configured to set a kickdown-acceleration-time target speed ratio in accordance with a vehicle speed and an accelerator operation quantity, to cause an output rotational speed of the transmission to increase substantially linearly with an increase of input rotational speed of the transmission, when the kickdown-acceleration request determining section determines that a kickdown acceleration request is present, and to control the speed ratio in accordance with the kickdown-acceleration-time target speed ratio.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: August 26, 2008
    Assignee: Jatco Ltd
    Inventors: Atsufumi Kobayashi, Takuro Kawasumi
  • Publication number: 20070087874
    Abstract: A shift control apparatus of a CVT installed in a non-ABS equipped vehicle is arranged to estimate a condition of a transmission ratio of the CVT, to prohibit a shift operation of varying the transmission ratio to a high-speed-side transmission ratio relative to a first predetermined transmission ratio when the driving-wheel acceleration is greater than or equal to a predetermined acceleration, and to cancel the prohibition of the shift operation when the transmission ratio is in a high speed side relative to a second transmission ratio under a condition that the driving-wheel acceleration becomes greater than or equal to the predetermined acceleration.
    Type: Application
    Filed: June 13, 2006
    Publication date: April 19, 2007
    Inventors: Atsufumi Kobayashi, Tatsuo Ochiai, Takuro Kawasumi
  • Publication number: 20060240942
    Abstract: A shift control apparatus for a continuously-variable transmission includes an operating condition sensing section; a normal-time speed ratio determining section; a normal-time control section; a kickdown-acceleration request determining section; a kickdown-acceleration-time control section; and an accelerator-operation-quantity variation-rate limiting section. The kickdown-acceleration-time control section is configured to set a kickdown-acceleration-time target speed ratio in accordance with a vehicle speed and an accelerator operation quantity, to cause an output rotational speed of the transmission to increase substantially linearly with an increase of input rotational speed of the transmission, when the kickdown-acceleration request determining section determines that a kickdown acceleration request is present, and to control the speed ratio in accordance with the kickdown-acceleration-time target speed ratio.
    Type: Application
    Filed: April 26, 2006
    Publication date: October 26, 2006
    Inventors: Atsufumi Kobayashi, Takuro Kawasumi