Patents by Inventor Keith D. Struthers

Keith D. Struthers 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).

  • Submodulation of a pulse-width-modulated solenoid control valve
    Patent number: 4898361
    Abstract: A PWM solenolid operated valve control arrangement which substantially eliminates supply voltage dependent variability of the valve without the expense or inefficiency of a conventional voltage regulator. The coil of the solenolid valve is pulse-width-modulated in relation to the commanded output result and the energization periods are submodulated in relation to the magnitude of the supply voltage. The effective voltage applied to the coil, and hence the operating characteristics of the solenoid valve, are thereby made substantially independent of supply voltage variations.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: February 6, 1990
    Assignees: General Motors Corporation, Delco Electronics Corporation
    Inventors: James G. Bender, Lee F. Herron, Keith D. Struthers