Patents by Inventor Yoshihiko Maeno

Yoshihiko Maeno 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).

  • Diagnostic apparatus for squib line system in vehicular air bag system
    Patent number: 5659474
    Abstract: In a vehicular air bag system, a diagnostic apparatus for testing a squib line is provided which has: a first diagnostic resistor R1 one end of which is connected to a terminal D+ of a squib; a first diagnostic switching means Q1 for connecting the other end of the R1 to an ignition voltage VDC; a second diagnostic resistor R3 one end of which is connected to the terminal D+ of the squib; a second diagnostic switching means Q2 for connecting the other end of the R3 to ground; and a CPU. The CPU measures the potentials VD+ and VD- at the squib, by switching the first and second diagnostic switching means Q1 and Q2 on and off in an appropriate manner, and calculates the values of various prescribed diagnostic parameters on the basis of the value of VDC and the values of the VD+ and VD-. Then, the values of the diagnostic parameters are compared with various prescribed evaluation threshold values to determine the source of a failure.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: August 19, 1997
    Assignees: Fujitsu Ten Limited, Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshihiko Maeno, Koichi Sugiyama, Takayuki Yamaguchi