Patents by Inventor Yukihiro IMAMURA

Yukihiro IMAMURA 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: 10144449
    Abstract: An electric power steering apparatus that calculates a current command value based on at least a steering torque and assist-controls a steering system by driving a motor based on the current command value, the apparatus having a function to detect a steering angle on a steering and includes a gain section having a gain characteristic that a gain changes corresponding to the steering angle, such that a new current command value is generated by multiplying the current command value with the gain outputted from the gain section corresponding to the steering angle, and the gain characteristic is a constant value “1.0” till a steering angle ?1 short of a rack end, gradually decreases till a steering angle ?2 (>?1) exceeding the rack end and holds a constant value G (>0) in a region that the steering angle is equal to or more than the steering angle ?2.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: December 4, 2018
    Assignee: NSK LTD.
    Inventor: Yukihiro Imamura
  • Publication number: 20180194389
    Abstract: [Problem]An object of the present invention is to provide an electric power steering apparatus that abates the shock energy with an attenuation of the power at the end hitting time by stopping the current command value near the rack end, does not give the uncomfortable feeling to the driver and suppresses a hitting sound. [Means for Solving the Problem] The present invention is an electric power steering apparatus that calculates a current command value based on at least a steering torque and assist-controls a steering system by driving a motor based on the current command value, wherein has a function to detect a steering angle on a steering and comprises a gain section having a gain characteristic that a gain changes corresponding to the steering angle, wherein a new current command value is generated by multiplying the current command value with the gain outputted from the gain section corresponding to the steering angle, and the gain characteristic is a constant value “1.
    Type: Application
    Filed: June 15, 2015
    Publication date: July 12, 2018
    Applicant: NSK LTD.
    Inventor: Yukihiro IMAMURA