Patents by Inventor Hidetoshi Namiki

Hidetoshi Namiki 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).

  • Deterioration detecting device for oxygen concentration sensor
    Patent number: 7040085
    Abstract: Detecting deterioration of an oxygen concentration sensor disposed downstream of a catalyst. The air-fuel ratio is set to a rich air-fuel ratio, and then changed to a lean air-fuel ratio after an enrichment time period elapaes from the time of enrichment. A determination threshold is set according to a dead time period from the time the air-fuel ratio has been changed to the lean air-fuel ratio to the time the output from the oxygen concentration sensor reaches a first value. A change time period from the time the output from the oxygen concentration sensor reaches the first value to the time the output from the oxygen concentration sensor reaches a second value indicative of an oxygen concentration higher than an oxygen concentration corresponding to the first value, is measured. The oxygen concentration sensor is determined to be deteriorated when the change time period is greater than the determination threshold.
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: May 9, 2006
    Assignee: Honda Motor Co., Ltd.
    Inventor: Hidetoshi Namiki
  • Deterioration detecting device for oxygen concentration sensor
    Publication number: 20040211168
    Abstract: Detecting deterioration of an oxygen concentration sensor disposed downstream of a catalyst. The air-fuel ratio is set to a rich air-fuel ratio, and then changed to a lean air-fuel ratio after an enrichment time period elapaes from the time of enrichment. A determination threshold is set according to a dead time period from the time the air-fuel ratio has been changed to the lean air-fuel ratio to the time the output from the oxygen concentration sensor reaches a first value. A change time period from the time the output from the oxygen concentration sensor reaches the first value to the time the output from the oxygen concentration sensor reaches a second value indicative of an oxygen concentration higher than an oxygen concentration corresponding to the first value, is measured. The oxygen concentration sensor is determined to be deteriorated when the change time period is greater than the determination threshold.
    Type: Application
    Filed: April 7, 2004
    Publication date: October 28, 2004
    Applicant: HONDA MOTOR CO., LTD.
    Inventor: Hidetoshi Namiki