Patents by Inventor Mistuo Hashizume

Mistuo Hashizume 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).

  • Exhaust emission control system for internal combustion engine
    Patent number: 6629408
    Abstract: An exhaust emission control system for an internal combustion engine, having a nitrogen oxide removing device provided in an exhaust system of the internal combustion engine for absorbing nitrogen oxides contained in exhaust gases in an exhaust lean condition. The exhaust emission control system includes first and second oxygen concentration sensors respectively provided upstream and downstream of the nitrogen oxide removing device for detecting an oxygen concentration in the exhaust gases. The air-fuel ratio of an air-fuel mixture to be supplied to the engine is changed from a lean region to a rich region with respect to a stoichiometric ratio. An amount of reducing components flowing into the nitrogen oxide removing device from the time when an output value from the first oxygen concentration sensor has changed to a value indicative of a rich air-fuel ratio after enrichment of the air-fuel ratio is calculated.
    Type: Grant
    Filed: October 11, 2000
    Date of Patent: October 7, 2003
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Akira Murakami, Mistuo Hashizume, Kotaro Miyashita, Toshikatsu Takanohashi, Yuichiro Tanabe, Akira Hashimoto