Patents by Inventor Tamiharu Nakamura

Tamiharu Nakamura 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).

  • Method for purifying exhaust gas and system therefor
    Patent number: 8263031
    Abstract: A method is provided for purifying exhaust gas from an engine having an exhaust passage with a selective reducing catalyst and an oxidation catalyst upstream of the selective reducing catalyst. The method calculates an amount of NOx that flows into the selective reducing catalyst; sets an amount of an additive agent to be supplied to the selective reducing catalyst based on the calculated amount of NOx; determines a degradation degree of the oxidation catalyst; determines whether a correction to the amount of the additive agent is necessary based on the determined degradation degree of the oxidation catalyst; corrects the amount of the additive agent to be supplied when the correction is necessary; and supplies the additive agent to the selective reducing catalyst in the corrected amount if the amount is determined to be corrected and in the uncorrected amount if the amount is determined not to be corrected.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: September 11, 2012
    Assignee: Mazda Motor Corporation
    Inventors: Hiroaki Gotan, Yoshiaki Tomita, Masashi Naono, Tamiharu Nakamura, Hiroaki Ishida
  • METHOD FOR PURIFYING EXHAUST GAS AND SYSTEM THEREFORE
    Publication number: 20110236280
    Abstract: A method is provided for purifying exhaust gas from an engine having an exhaust passage with a selective reducing catalyst and an oxidation catalyst upstream of the selective reducing catalyst. The method calculates an amount of NOx that flows into the selective reducing catalyst; sets an amount of an additive agent to be supplied to the selective reducing catalyst based on the calculated amount of NOx; determines a degradation degree of the oxidation catalyst; determines whether a correction to the amount of the additive agent is necessary based on the determined degradation degree of the oxidation catalyst; corrects the amount of the additive agent to be supplied when the correction is necessary; and supplies the additive agent to the selective reducing catalyst in the corrected amount if the amount is determined to be corrected and in the uncorrected amount if the amount is determined not to be corrected.
    Type: Application
    Filed: February 23, 2011
    Publication date: September 29, 2011
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Hiroaki Gotan, Yoshiaki Tomita, Masashi Naono, Tamiharu Nakamura, Hiroaki Ishida