Patents by Inventor Randall L. Hayes

Randall L. Hayes 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 detecting and identifying faulty sensors in a process
    Patent number: 5680409
    Abstract: A method and apparatus is provided for detecting a faulty sensor within a process control system having a set of sensors, each of which produces an associated sensor output signal. The method and apparatus produce a set of sensor estimate signals from the sensor output signals using principal component analysis and then determine a validity index for each of the sensors as a ratio of two residuals, wherein each of the residuals represents a different measure of the difference between the sensor output signals and the sensor estimate signals. The determined validity indexes are then used to detect a failure of one of the sensors and/or to identify which one of the sensors has failed.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: October 21, 1997
    Assignee: Fisher-Rosemount Systems, Inc.
    Inventors: S. Joe Qin, Ricardo H. Dunia, Randall L. Hayes