Patents by Inventor Naoko Miyatake

Naoko Miyatake 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).

  • Air-fuel ratio control system for internal combustion engines
    Patent number: 6003308
    Abstract: An air-fuel ratio control system for an internal combustion engine has an exhaust gas-purifying device arranged in the exhaust system of the engine. An oxygen concentration sensor is arranged either in the exhaust system at a location downstream of the exhaust gas-purifying device or in the exhaust gas-purifying device, and an ECU periodically changes the air-fuel ratio of a mixture supplied to the engine alternately to a rich side and to a lean side with respect to a stoichiometric air-fuel ratio. The purification capacity of the exhaust gas-purifying device is determined based on an output from the oxygen concentration sensor. The repetition period of the periodical changing of the air-fuel ratio is shortened as the determined purification capacity is deteriorated.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: December 21, 1999
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kojiro Tsutsumi, Asao Ukai, Naoko Miyatake, Katsushi Watanabe