Patents by Inventor Kazufumi Arino

Kazufumi Arino 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).

  • System for detecting deterioration of exhaust gas purifying catalyst for automobile engine
    Patent number: 5979160
    Abstract: A diagnosis of deterioration and/or normality of an exhaust gas purifying catalyst is made by comparing a ratio of reversal frequencies of outputs from oxygen sensors disposed on opposite sides of the exhaust gas purifying catalyst with a threshold ratio. Discrimination is performed on both normality and deterioration in a standard gas quantity zone, on only normality in a large gas quantity zone, and on only deterioration in a small gas quantity zone, and nothing is made in an extra large gas quantity zone.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: November 9, 1999
    Assignee: Mazda Motor Corporation
    Inventors: Seiji Yashiki, Kazufumi Arino, Masanobu Kotoku, Kazuhiro Shinmoto