Patents by Inventor Tamotsu Kamakura

Tamotsu Kamakura 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).

  • Valve operation verification system for verifying valve operation of valve disposed in hot gas flow passage
    Patent number: 6035835
    Abstract: A valve operation verifying system for making verification of valve operation of an EGR valve of a type having a diaphragm elastically deformable according to operating conditions of an engine to admit controlled amounts of exhaust gas that is recirculated into an intake air stream which verifies, on a basis of gas pressure in an EGR passage, whether the diaphragm remains elastically deformable as specified and whether a pressure sensor remains free from freezing, and executes the verification of valve operation of the EGR valve on a basis of a change in the gas pressure in the EGR passage when the EGR valve opens and when it closes, and when the temperature of ambient air is lower than a critical point, verifying that the diaphragm remains elastically deformable as specified and that said pressure sensor is free from freezing.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: March 14, 2000
    Assignee: Mazda Motor Corporation
    Inventors: Shingo Shigihama, Tetsushi Hosokai, Tamotsu Kamakura, Katsuhiko Sakamoto, Futoshi Nishioka, Masanobu Kotoku, Kazuhiro Shinmoto