Patents by Inventor Haruya Shirase

Haruya Shirase 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).

  • EGR Control system
    Patent number: 4434776
    Abstract: An EGR system has two vacuum modulation valves, one responsive to venturi vacuum and "EGR" pressure (which prevails just upstream of the EGR flow control valve) and the other responsive to venturi vacuum and induction vacuum. The first valve predominately dilutes the vacuum operating the EGR flow control valve during heavy load operation while the second valve predominately dilutes said vacuum during light load and/or high speed operation. With this combination, excessive EGR is avoided during said light load and high speed operations, respectively.
    Type: Grant
    Filed: March 17, 1981
    Date of Patent: March 6, 1984
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Haruya Shirase, Takehisa Kondo