Patents by Inventor Yoshito Hujishiro

Yoshito Hujishiro 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).

  • Glow plug control drive method and glow plug drive control system
    Patent number: 9322384
    Abstract: To suppress current fluctuations upon commencement of driving and prolong lifespan by reducing electric stress caused by current fluctuations. A glow plug 1, a glow switch 2, and a stabilizing coil 3 are series-connected, and upon commencement of the driving of the glow plug 1, a repetition frequency of PWM signals that control the opening and closing of the glow switch 2 is made into a higher frequency than a repetition frequency in a normal drive state and the opening and closing of the glow switch 2 is controlled (S104), and when a predetermined drive shift condition has been met (S106), the repetition frequency of the PWM signals is returned to the frequency during normal driving and the opening and closing of the glow switch 2 is controlled (S108), whereby the current upon commencement of driving is smoothed and the occurrence of an instantaneous large current is suppressed.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: April 26, 2016
    Assignee: Bosch Corporation
    Inventors: Yoshito Hujishiro, Yutaka Tanaka, Tomohiro Nakamura
  • GLOW PLUG CONTROL DRIVE METHOD AND GLOW PLUG DRIVE CONTROL SYSTEM
    Publication number: 20130255615
    Abstract: To suppress current fluctuations upon commencement of driving and prolong lifespan by reducing electric stress caused by current fluctuations. A glow plug 1, a glow switch 2, and a stabilizing coil 3 are series-connected, and upon commencement of the driving of the glow plug 1, a repetition frequency of PWM signals that control the opening and closing of the glow switch 2 is made into a higher frequency than a repetition frequency in a normal drive state and the opening and closing of the glow switch 2 is controlled (S104), and when a predetermined drive shift condition has been met (S106), the repetition frequency of the PWM signals is returned to the frequency during normal driving and the opening and closing of the glow switch 2 is controlled (S108), whereby the current upon commencement of driving is smoothed and the occurrence of an instantaneous large current is suppressed.
    Type: Application
    Filed: December 6, 2011
    Publication date: October 3, 2013
    Applicant: BOSCH CORPORATION
    Inventors: Yoshito Hujishiro, Yutaka Tanaka, Tomohiro Nakamura