Patents by Inventor Everett P. Schumaker

Everett P. Schumaker 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).

  • Onboard diagnostic system of vehicle ignition system
    Patent number: 4899579
    Abstract: A method of operating an onboard diagnostic system for a distributorless ignition system of an internal combustion engine includes detecting the time of occurrence of a spark plug firing and calculating the time of spark plug firing. The calculated time and the detected time are compared to see if they come within a predetermined time period, adjusted for averaged rotational velocity. A fault is indicated if the time of occurrence of the calculated and the detected spark do not come within the predetermined time period.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: February 13, 1990
    Assignee: Ford Motor Company
    Inventors: Michael S. Sweppy, Richard R. Tuttle, Everett P. Schumaker