Patents by Inventor Takao Nakao

Takao Nakao 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).

  • Knock detection apparatus and knock detection method
    Patent number: 7243020
    Abstract: A knock detection apparatus which is capable of changing a knock control starting time period appropriately so as to prevent erroneous knock determination, to thereby expand a knock control range. A peak value acquisition unit acquires a peak value of a vibration of an internal combustion engine during each rotation cycle of a crankshaft of the engine. A background calculator calculates a background by averaging peak values acquired by the peak value acquisition unit. A knock determination unit performs knock determination based on whether a peak value acquired by the peak value acquisition unit is higher than a predetermined level above the background, and feedback controls knock in the engine according to a result of the knock determination. A temperature acquisition unit acquires a temperature of the engine during a start of the engine.
    Type: Grant
    Filed: December 2, 2005
    Date of Patent: July 10, 2007
    Assignee: Fujitsu Ten Limited
    Inventors: Takao Nakao, Hirofumi Taguchi, Hiroshi Arita, Takahiro Aki
  • Knock detection apparatus and knock detection method
    Publication number: 20060122765
    Abstract: A knock detection apparatus which is capable of changing a knock control starting time period appropriately so as to prevent erroneous knock determination, to thereby expand a knock control range. A peak value acquisition unit acquires a peak value of a vibration of an internal combustion engine during each rotation cycle of a crankshaft of the engine. A background calculator calculates a background by averaging peak values acquired by the peak value acquisition unit. A knock determination unit performs knock determination based on whether a peak value acquired by the peak value acquisition unit is higher than a predetermined level above the background, and feedback controls knock in the engine according to a result of the knock determination. A temperature acquisition unit acquires a temperature of the engine during a start of the engine.
    Type: Application
    Filed: December 2, 2005
    Publication date: June 8, 2006
    Applicant: Fujitsu Ten Limited
    Inventors: Takao Nakao, Hirofumi Taguchi, Hiroshi Arita, Takahiro Aki