Patents by Inventor Motohisa Tokunaga

Motohisa Tokunaga 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).

  • Gas fuel supply system
    Patent number: 7467622
    Abstract: A gas fuel supply system comprises an injector provided in an intake pipe of an internal combustion engine, a fuel supply passage for supplying the gas fuel to the injector, and source pressure control means for controlling pressure of the gas fuel supplied to the injector through the fuel supply passage by using pressure in an intake pipe such that the differential pressure between the pressure of the gas fuel supplied to the injector and the pressure in the intake pipe increases as the pressure in the intake pipe increases.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: December 23, 2008
    Assignee: Isuzu Motors Limited
    Inventor: Motohisa Tokunaga
  • Gas fuel supply system
    Publication number: 20070157909
    Abstract: A gas fuel supply system comprises an injector provided in an intake pipe of an internal combustion engine, a fuel supply passage for supplying the gas fuel to the injector, and source pressure control means for controlling pressure of the gas fuel supplied to the injector through the fuel supply passage by using pressure in an intake pipe such that the differential pressure between the pressure of the gas fuel supplied to the injector and the pressure in the intake pipe increases as the pressure in the intake pipe increases.
    Type: Application
    Filed: February 6, 2007
    Publication date: July 12, 2007
    Applicant: Isuzu Motors Limited
    Inventor: Motohisa Tokunaga
  • Gas fuel feed device
    Patent number: 7191768
    Abstract: It is an object of this invention to provide a gas fuel supply system in which a controllable range in the fuel injection quantity control by an injector is enlarged. According to one preferable aspect of this invention, the gas fuel supply system comprises an injector provided in an intake pipe of an internal combustion engine, a fuel supply passage for supplying the gas fuel to the injector, and means for controlling pressure of the gas fuel supplied to the injector through the fuel supply passage by using negative pressure in the intake pipe such that the pressure of the gas fuel increases if the negative pressure in the intake pipe decreases, and the pressure of the gas fuel decreases if the negative pressure in the intake pipe increases.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: March 20, 2007
    Assignee: Isuza Motors Limited
    Inventor: Motohisa Tokunaga
  • Gas fuel feed device
    Publication number: 20060054144
    Abstract: It is an object of this invention to provide a gas fuel supply system in which a controllable range in the fuel injection quantity control by an injector is enlarged. According to one preferable aspect of this invention, the gas fuel supply system comprises an injector provided in an intake pipe of an internal combustion engine, a fuel supply passage for supplying the gas fuel to the injector, and means for controlling pressure of the gas fuel supplied to the injector through the fuel supply passage by using negative pressure in the intake pipe such that the pressure of the gas fuel increases if the negative pressure in the intake pipe decreases, and the pressure of the gas fuel decreases if the negative pressure in the intake pipe increases.
    Type: Application
    Filed: August 8, 2003
    Publication date: March 16, 2006
    Applicant: ISUZU MOTORS LIMITED
    Inventor: Motohisa Tokunaga