Patents by Inventor Hiroyuki Shirata

Hiroyuki Shirata 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: 10946856
    Abstract: Provided is a vehicle drive system capable of suppressing a feeling of acceleration drop and free running, thereby improving vehicle riding comfort. The vehicle drive system includes: an internal combustion engine for driving a primary drive wheel; a stepped variable transmission; an assist motor for driving a secondary drive wheel; and a motor control device for controlling the assist motor, wherein the stepped variable transmission is a seamless-shift transmission configured such that a drive force to be transmitted therethrough is interrupted during shifting down, but not substantially interrupted during shifting up, and the motor control device is operable, during the shifting down by the stepped variable transmission, to cause the assist motor to generate a drive force to compensate for the interruption of the drive force.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: March 16, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Hajime Oyama, Shigeo Yoshikawa, Hiroyuki Shirata, Hideki Sanai
  • Publication number: 20200114901
    Abstract: Provided is a vehicle drive system capable of suppressing a feeling of acceleration drop and free running, thereby improving vehicle riding comfort. The vehicle drive system includes: an internal combustion engine for driving a primary drive wheel; a stepped variable transmission; an assist motor for driving a secondary drive wheel; and a motor control device for controlling the assist motor, wherein the stepped variable transmission is a seamless-shift transmission configured such that a drive force to be transmitted therethrough is interrupted during shifting down, but not substantially interrupted during shifting up, and the motor control device is operable, during the shifting down by the stepped variable transmission, to cause the assist motor to generate a drive force to compensate for the interruption of the drive force.
    Type: Application
    Filed: September 23, 2019
    Publication date: April 16, 2020
    Inventors: Hajime Oyama, Shigeo Yoshikawa, Hiroyuki Shirata, Hideki Sanai