Patents by Inventor Yasushi Tokuda

Yasushi Tokuda 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).

  • Downhill speed controller
    Patent number: 7134985
    Abstract: The invention is intended to provide a downhill speed control system which employs a method of setting a target vehicle speed in advance, thereby improving controllability when a vehicle runs down a slope, and giving an operator improved operability in setting of the target vehicle speed. Brakes are controlled so that, when the vehicle runs down the slope, an actual vehicle speed is matched with a target speed set by a switch which can set the target speed by selectively or continuously changing plural preset speeds. Also, control constants for PID control are modified depending on settings of a downslope gradient setting switch and a load setting switch. When an acceleration computed from the actual vehicle speed is larger than a target acceleration, the strength of applied brake is increased.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: November 14, 2006
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yutaka Watanabe, Hiroshi Watanabe, Yasushi Tokuda
  • Downhill speed controller
    Publication number: 20050096183
    Abstract: The invention is intended to provide a downhill speed control system which employs a method of setting a target vehicle speed in advance, thereby improving controllability when a vehicle runs down a slope, and giving an operator improved operability in setting of the target vehicle speed. Brakes are controlled so that, when the vehicle runs down the slope, an actual vehicle speed is matched with a target speed set by a switch which can set the target speed by selectively or continuously changing plural preset speeds. Also, control constants for PID control are modified depending on settings of a downslope gradient setting switch and a load setting switch. When an acceleration computed from the actual vehicle speed is larger than a target acceleration, the strength of applied brake is increased.
    Type: Application
    Filed: October 10, 2003
    Publication date: May 5, 2005
    Inventors: Yutaka Watanabe, Hiroshi Watanabe, Yasushi Tokuda
  • Graphic user interface for display for construction machine
    Patent number: D549722
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: August 28, 2007
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Eitaro Ito, Tsutomu Fujii, Kenichi Sagiya, Yasushi Tokuda, Yutaka Watanabe, Takao Kurosawa