Patents by Inventor Takashi Mukaihara

Takashi Mukaihara 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 diagnosing deterioration of catalyst
    Patent number: 7021044
    Abstract: A diagnostic system in which the accuracy of the diagnosis of the deterioration state of a catalyst in a catalytic converter for cleaning the exhaust gas of an internal combustion engine is enhanced without incurring a rise in cost. The temperature of the catalyst is estimated using the operating-state signal (for example, the flow rate of intake air or the width of a fuel injection pulse) of the engine by a diagnostic device. The conversion efficiency of the catalyst calculated from the outputs of oxygen sensors is corrected using the estimated temperature by the diagnostic device. The deterioration state of the catalyst is diagnosed on the basis of the corrected temperature by the diagnostic device.
    Type: Grant
    Filed: December 31, 2001
    Date of Patent: April 4, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Mukaihara, Toshio Ishii, Kiyoshi Miura, Kazuya Kawano
  • System for diagnosing deterioration of catalyst
    Publication number: 20020073693
    Abstract: A diagnostic system in which the accuracy of the diagnosis of the deterioration state of a catalyst in a catalytic converter for cleaning the exhaust gas of an internal combustion engine is enhanced without incurring a rise in cost. The temperature of the catalyst is estimated using the operating-state signal (for example, the flow rate of intake air or the width of a fuel injection pulse) of the engine by a diagnostic device. The conversion efficiency of the catalyst calculated from the outputs of oxygen sensors is corrected using the estimated temperature by the diagnostic device. The deterioration state of the catalyst is diagnosed on the basis of the corrected temperature by the diagnostic device.
    Type: Application
    Filed: December 31, 2001
    Publication date: June 20, 2002
    Applicant: Hitachi, Ltd
    Inventors: Takashi Mukaihara, Toshio Ishii, Kiyoshi Miura, Kazuya Kawano