Patents by Inventor Tosihiko Oohasi

Tosihiko Oohasi 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).

  • Vehicle power supply device and its degradation judgment method
    Patent number: 7742885
    Abstract: A vehicle power supply device has a capacitor unit including capacitors storing auxiliary power; a temperature sensor; a charge circuit; a capacitor-unit current detector; a capacitor-unit voltage detector; a controller; a storage; and a determination unit. The determination unit determines the degradation level of the capacitor unit based on at least one of an internal resistance standard value and a corrected calculated value of capacitance. This structure determines degradation of the vehicle power supply device more accurately than ever, so that the device can be used until the end of the actual life.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: June 22, 2010
    Assignee: Panasonic Corporation
    Inventors: Tosihiko Oohasi, Yohsuke Mitani, Junji Takemoto, Kazuki Morita, Yoshimitu Odajima
  • Vehicle power supply device
    Patent number: 7680612
    Abstract: A vehicle power supply device performs highly accurate determination of degradation of the capacitor unit as follows. Internal resistance and capacitance are corrected according to the temperature of capacitor unit during charge or discharge, thereby obtaining a corrected calculated value if capacitance. The corrected calculated value of capacitance is substituted into a degradation determination formula, which is pre-calculated according to the temperature, thereby calculating the standard value corresponding to the temperature detected by temperature sensor. When the standard value is equal to or less than the corrected calculated value of internal resistance, capacitor unit is determined to be degraded.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: March 16, 2010
    Assignee: Panasonic Corporation
    Inventors: Tosihiko Oohasi, Yohsuke Mitani
  • VEHICLE POWER SUPPLY DEVICE
    Publication number: 20090119034
    Abstract: A vehicle power supply device performs highly accurate determination of degradation of the capacitor unit as follows. Internal resistance and capacitance are corrected according to the temperature of capacitor unit during charge or discharge, thereby obtaining a corrected calculated value if capacitance. The corrected calculated value of capacitance is substituted into a degradation determination formula, which is pre-calculated according to the temperature, thereby calculating the standard value corresponding to the temperature detected by temperature sensor. When the standard value is equal to or less than the corrected calculated value of internal resistance, capacitor unit is determined to be degraded.
    Type: Application
    Filed: July 26, 2006
    Publication date: May 7, 2009
    Inventors: Tosihiko Oohasi, Yohsuke Mitani
  • VEHICLE POWER SUPPLY DEVICE AND ITS DEGRADATION JUDGMENT METHOD
    Publication number: 20090088993
    Abstract: A vehicle power supply device has a capacitor unit including capacitors storing auxiliary power; a temperature sensor; a charge circuit; a capacitor-unit current detector; a capacitor-unit voltage detector; a controller; a storage; and a determination unit. The determination unit determines the degradation level of the capacitor unit based on at least one of an internal resistance standard value and a corrected calculated value of capacitance. This structure determines degradation of the vehicle power supply device more accurately than ever, so that the device can be used until the end of the actual life.
    Type: Application
    Filed: July 21, 2006
    Publication date: April 2, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tosihiko Oohasi, Yohsuke Mitani, Junji Takemoto, Kazuki Morita, Yoshimitu Odajima