Patents by Inventor Katuhiro Kumagai

Katuhiro Kumagai 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 determining deterioration of catalysts of internal combustion engines
    Patent number: 5325664
    Abstract: A catalyst deterioration-determining system determines deterioration of a catalyst arranged in the exhaust passage of an internal combustion engine. An ECU is responsive to an output from an O.sub.2 sensor arranged upstream of the catalyst or outputs from O.sub.2 sensors arranged upstream and downstream of the catalyst for controlling the air-fuel ratio of a mixture supplied to the engine by means of an air-fuel ratio correction value (first air-fuel ratio control). When the engine is in a predetermined operating condition, the system effects changeover from the first air-fuel ratio control to a second air-fuel ratio control which is responsive to the output from the downstream O.sub.2 sensor for controlling the air-fuel ratio of the mixture by means of the air-fuel ratio correction value.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: July 5, 1994
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yasunari Seki, Toshihiko Sato, Katuhiro Kumagai, Hiroshi Maruyama, Yoichi Iwata, Tsuyoshi Takizawa, Kenichi Maeda, Shigetaka Kuroda, Masataka Chikamatsu, Shukoh Terata, Kazutomo Sawamura, Hajime Uto, Takuya Aoki, Makoto Kobayashi