Patents by Inventor Cristi A. Martabano

Cristi A. Martabano 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).

  • Apparatus for diagnosing individual cylinder performance by estimated instantaneous engine speeds
    Patent number: 5132909
    Abstract: An engine equipped with a low resolution crankshaft rotation encoder is diagnosed by measuring the average speeds for each encoder period, deriving estimated instantaneous speeds for top dead center (TDC) positions for each cylinder and for the points midway between TDCs. Speed changes calculated from the estimated speeds for the compression and combustion phases of each cylinder provide measures of the compression and power output of each cylinder. An engine speed signature trace derived from the estimated speeds is displayed to reveal speed changes and a composite display of several consecutive signatures provides further information.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: July 21, 1992
    Assignee: Saturn Corporation
    Inventors: Thaddeus Schroeder, Cristi A. Martabano, Rodger B. Evans, Robert A. Dalley