Patents by Inventor Ryohei YAMAGISHI

Ryohei YAMAGISHI 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: 10641393
    Abstract: An automatic transmission for improving responsiveness until reverse movement is possible. When the range is switched from a parking range to a reverse range, P lock release control for releasing a parking state starts. When a two-way clutch is in a reverse rotation prevention state, hydraulic pressure is supplied to a first clutch, a third clutch, and a third brake, and a process in a reverse side preparation mode starts. When the first clutch is in a connected state and a rotational speed of an input shaft is a predetermined rotational speed, whether a parking piston of a parking lock mechanism is at an unlock position is determined. When it is at the unlock position, a driving source is requested to restrict an output torque. Then, hydraulic pressure is supplied to the two-way clutch, and the two-way clutch is switched from a reverse rotation prevention state to a fixed state.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: May 5, 2020
    Assignee: Honda Motor Co., Ltd.
    Inventors: Ryohei Yamagishi, Yuya Tachibanada
  • Patent number: 10626983
    Abstract: Provided is an automatic transmission capable of smoothly switching a switching mechanism. A control part ECU of a transmission recognizes an input torque and a friction torque when an instruction to switch a two-way clutch from a fixed state to a reverse rotation prevention state is received while a first clutch, a second clutch and a third clutch are in an open state, and switches the two-way clutch from the fixed state to the reverse rotation prevention state when the input torque is equal to or greater than the friction torque.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: April 21, 2020
    Assignee: Honda Motor Co., Ltd.
    Inventors: Ryohei Yamagishi, Yuya Tachibanada, Yutaka Ishikawa
  • Patent number: 10557545
    Abstract: A control apparatus of an automatic transmission, which includes a mechanical engaging mechanism functioning as a brake, includes a determination unit determining, when a selected gear is a lowest forward speed gear, and the mechanism is in a second state, whether to switch the mechanism to the first state, and a switching processing unit switching the mechanism to the first state based on a determination result. In the first state, only rotation of a predetermined rotational element provided in planetary gear mechanisms in a first direction is restricted. In the second state, rotation of the predetermined rotational element in both the first and second direction is restricted. The determination unit determines to switch the mechanism to the first state at least on condition that a driving force is larger than a predetermined driving force.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: February 11, 2020
    Assignee: HONDA MOTOR CO., LTD
    Inventors: Yuya Tachibanada, Yutaka Ishikawa, Tetsuya Mochizuki, Koichi Fushimi, Masaya Tamai, Ryohei Yamagishi
  • Patent number: 10145467
    Abstract: Provided is an automatic transmission with which a large impact is hardly applied to the component of the switching mechanism or the switching control circuit when the drive source is re-driven. When a drive source ENG is determined to be in the stopped state, if the position of a slider HC1 does not correspond to the position the control part ECU instructed before the drive source ENG is determined to be in the stopped state, the control part ECU of the automatic transmission TM transmits a signal for switching a two-way clutch TW to a state corresponding to the state of a slider HC1.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: December 4, 2018
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yuya Tachibanada, Ryohei Yamagishi
  • Publication number: 20180283539
    Abstract: Provided is an automatic transmission capable of smoothly switching a switching mechanism. A control part ECU of a transmission recognizes an input torque and a friction torque when an instruction to switch a two-way clutch from a fixed state to a reverse rotation prevention state is received while a first clutch, a second clutch and a third clutch are in an open state, and switches the two-way clutch from the fixed state to the reverse rotation prevention state when the input torque is equal to or greater than the friction torque.
    Type: Application
    Filed: March 15, 2018
    Publication date: October 4, 2018
    Applicant: Honda Motor Co.,Ltd.
    Inventors: Ryohei YAMAGISHI, Yuya TACHIBANADA, Yutaka ISHIKAWA
  • Publication number: 20180283550
    Abstract: An automatic transmission for improving responsiveness until reverse movement is possible. When the range is switched from a parking range to a reverse range, P lock release control for releasing a parking state starts. When a two-way clutch is in a reverse rotation prevention state, hydraulic pressure is supplied to a first clutch, a third clutch, and a third brake, and a process in a reverse side preparation mode starts. When the first clutch is in a connected state and a rotational speed of an input shaft is a predetermined rotational speed, whether a parking piston of a parking lock mechanism is at an unlock position is determined. When it is at the unlock position, a driving source is requested to restrict an output torque. Then, hydraulic pressure is supplied to the two-way clutch, and the two-way clutch is switched from a reverse rotation prevention state to a fixed state.
    Type: Application
    Filed: March 9, 2018
    Publication date: October 4, 2018
    Applicant: Honda Motor Co.,Ltd.
    Inventors: Ryohei YAMAGISHI, Yuya TACHIBANADA
  • Publication number: 20180283538
    Abstract: A control apparatus of an automatic transmission, which includes a mechanical engaging mechanism functioning as a brake, includes a determination unit determining, when a selected gear is a lowest forward speed gear, and the mechanism is in a second state, whether to switch the mechanism to the first state, and a switching processing unit switching the mechanism to the first state based on a determination result. In the first state, only rotation of a predetermined rotational element provided in planetary gear mechanisms in a first direction is restricted. In the second state, rotation of the predetermined rotational element in both the first and second direction is restricted. The determination unit determines to switch the mechanism to the first state at least on condition that a driving force is larger than a predetermined driving force.
    Type: Application
    Filed: March 7, 2018
    Publication date: October 4, 2018
    Inventors: Yuya Tachibanada, Yutaka Ishikawa, Tetsuya Mochizuki, Koichi Fushimi, Masaya Tamai, Ryohei Yamagishi
  • Publication number: 20170268663
    Abstract: Provided is an automatic transmission with which a large impact is hardly applied to the component of the switching mechanism or the switching control circuit when the drive source is re-driven. When a drive source ENG is determined to be in the stopped state, if the position of a slider HC1 does not correspond to the position the control part ECU instructed before the drive source ENG is determined to be in the stopped state, the control part ECU of the automatic transmission TM transmits a signal for switching a two-way clutch TW to a state corresponding to the state of a slider HC1.
    Type: Application
    Filed: March 15, 2017
    Publication date: September 21, 2017
    Applicant: Honda Motor Co.,Ltd.
    Inventors: Yuya TACHIBANADA, Ryohei YAMAGISHI