Patents by Inventor Masaki Kodato

Masaki Kodato 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).

  • Publication number: 20190270482
    Abstract: There is provided a control device for a power steering device that provides stable steering feeling in the vicinity of a stroke end. The control device for the power steering device is configured to calculate a stopper torque that is a steering force in a direction opposite to a direction causing a turning angle to approach a stopper angle, based on a steering torque signal, when the turning angle approaches the stopper angle accompanied with a steering operation of a steering wheel, and configured to calculate a motor command signal that is used to drive a power-driven motor, based on a driving condition of a vehicle and the stopper torque.
    Type: Application
    Filed: March 15, 2017
    Publication date: September 5, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito NAKAKUKI, Kazuya YAMANO, Masaki KODATO
  • Patent number: 9862408
    Abstract: A transverse gradient current Ic which is larger than a basic assist current Ib is outputted, as a current command value, to motor driving section when direction correspondence judgment section 11 judges that rotation directions of first and second rotation angle signals ?1 and ?2 correspond with each other, when an advancing phase judgment section 12 judges that a phase of the second rotation angle signal is advanced, and when a phase variation judgment section 14 judges that a phase advance state of the second rotation angle signal ?2 continues.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: January 9, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito Nakakuki, Masaki Kodato, Kazuya Yamano, Yoshitaka Sugiyama, Tsukasa Miyajima, Masahiko Ushimura
  • Publication number: 20160368531
    Abstract: A transverse gradient current Ic which is larger than a basic assist current Ib is outputted, as a current command value, to motor driving section when direction correspondence judgment section 11 judges that rotation directions of first and second rotation angle signals ?1 and ?2 correspond with each other, when an advancing phase judgment section 12 judges that a phase of the second rotation angle signal is advanced, and when a phase variation judgment section 14 judges that a phase advance state of the second rotation angle signal ?2 continues.
    Type: Application
    Filed: January 14, 2015
    Publication date: December 22, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito NAKAKUKI, Masaki KODATO, Kazuya YAMANO, Yoshitaka SUGIYAMA, Tsukasa MIYAJIMA, Masahiko USHIMURA
  • Patent number: 9487230
    Abstract: For compensation for loss of a steering assist force due to friction of a steering mechanism, when calculating a friction correction value for the compensation, in an electronic control unit 6, a static friction and a kinetic friction are distinguished, and the calculation is made by combining the static friction correction value Sf and the kinetic friction correction value Kf according to each friction. It is therefore possible to make a proper friction loss compensation according to type of the friction.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: November 8, 2016
    Assignee: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Haruto Sakuma, Masaki Kodato, Kazuya Yamano
  • Patent number: 9457836
    Abstract: A power steering apparatus has a first characteristic which is a characteristic of a command signal with respect to steering torque and a second characteristic which is a characteristic different from the first characteristic. When switching is to be made to a characteristic selected from between the first and second characteristics, an interpolation characteristic intermediate between the first and second characteristics is calculated so that the characteristic used before switching of the characteristics gradually approaches the characteristic to be used after the switching, and a characteristic switching time for switching between the first and second characteristics is variably controlled in accordance with the steering torque.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: October 4, 2016
    Assignee: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Masaki Kodato, Kazuya Yamano
  • Publication number: 20160023678
    Abstract: For compensation for loss of a steering assist force due to friction of a steering mechanism, when calculating a friction correction value for the compensation, in an electronic control unit 6, a static friction and a kinetic friction are distinguished, and the calculation is made by combining the static friction correction value Sf and the kinetic friction correction value Kf according to each friction. It is therefore possible to make a proper friction loss compensation according to type of the friction.
    Type: Application
    Filed: January 27, 2014
    Publication date: January 28, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Haruto SAKUMA, Masaki KODATO, Kazuya YAMANO
  • Publication number: 20150088383
    Abstract: A power steering apparatus has a first characteristic which is a characteristic of a command signal with respect to steering torque and a second characteristic which is a characteristic different from the first characteristic. When switching is to be made to a characteristic selected from between the first and second characteristics, an interpolation characteristic intermediate between the first and second characteristics is calculated so that the characteristic used before switching of the characteristics gradually approaches the characteristic to be used after the switching, and a characteristic switching time for switching between the first and second characteristics is variably controlled in accordance with the steering torque.
    Type: Application
    Filed: September 22, 2014
    Publication date: March 26, 2015
    Applicant: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Masaki KODATO, Kazuya YAMANO
  • Patent number: 8579072
    Abstract: Electric power steering system has steering mechanism; input and output shaft side rotation angle sensors detecting rotation angles of input and output shafts; operation circuit calculating command current for an electric motor; rotation direction judging circuit judging whether rotation directions of the input and output shafts are identical; advanced-phase judging circuit judging which phase of input and output shaft side rotation angle signals (S1, S2) is advanced; normal/reverse input judging circuit judging that (i) when both rotation directions are identical and S1 is advanced, input is normal input and (ii) when both rotation directions are identical and S2 is advanced, input is reverse input; and command current correcting circuit. The command current correcting circuit corrects the command current so that when the normal input is judged, torque in the same direction as input shaft rotation direction generated by the electric motor is greater than a case of reverse input judgment.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: November 12, 2013
    Assignee: Hitachi Automotive Systems Steering, Ltd.
    Inventors: Masaki Kodato, Kazuya Yamano, Yoshitaka Sugiyama, Atsushi Yoshitake