Patents by Inventor Yasumari Okamoto

Yasumari Okamoto 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).

  • Fuel injection control system for internal combustion engine
    Patent number: 5284118
    Abstract: A fuel injection control system for a two cycle crankcase compression internal combustion engine wherein two sensors are provided for sensing air flow by measuring different engine running conditions. One sensor has a greater accuracy in a certain range of operation than the other and the system primarily sets the fuel injection based upon the output of the more sensitive sensor for the running condition. In the event of failure of the more sensitive sensor, the system defaults to control by the other sensor. The system bases the control on average readings over a number of cycles and also senses fault by determining when a sensor outputs a number of erroneous signals that are greater than a predetermined percentage.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: February 8, 1994
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Masahiko Kato, Yasumari Okamoto