Patents by Inventor Tetsuo Sawamoto

Tetsuo Sawamoto 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 and apparatus for storing main data with two checkup data
    Patent number: 7181645
    Abstract: An electronic control unit has a microcomputer and a backup RAM, which stores its data irrespective of ON/OFF of an engine ignition switch. The backup RAM stores a main data in its storage area, and two checkup data in its storage areas, respectively. The two checkup data are calculated as a two-byte data from the main data of a 4-byte floating points type data and equal to each other. The microcomputer executes a data storing operation in the order of one checkup data, the main data and the other checkup data. The microcomputer determines that the main data is correct when either one of the checkup data is determined correct.
    Type: Grant
    Filed: November 4, 2002
    Date of Patent: February 20, 2007
    Assignee: Denso Corporation
    Inventors: Tetsuo Sawamoto, Seiji Miyamoto
  • Method and apparatus for storing main data with two checkup data
    Publication number: 20030126499
    Abstract: An electronic control unit has a microcomputer and a backup RAM, which stores its data irrespective of ON/OFF of an engine ignition switch. The backup RAM stores a main data in its storage area, and two checkup data in its storage areas, respectively. The two checkup data are calculated as a two-byte data from the main data of a 4-byte floating points type data and equal to each other. The microcomputer executes a data storing operation in the order of one checkup data, the main data and the other checkup data. The microcomputer determines that the main data is correct when either one of the checkup data is determined correct.
    Type: Application
    Filed: November 4, 2002
    Publication date: July 3, 2003
    Inventors: Tetsuo Sawamoto, Seiji Miyamoto