Patents by Inventor Julian R. Verdejo

Julian R. Verdejo 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 and methods for estimating vehicle fuel composition
    Patent number: 7159623
    Abstract: A method of estimating composition of fuel in the fuel tank of a vehicle. A refuel event is detected. Fuel consumption is monitored during a plurality of stages after the refuel event. A plurality of fuel trim shift values are determined relative to the stages. The fuel trim shift values are used to estimate a fuel composition change. This method eliminates a need for a hardware fuel composition sensor and also provides dynamic filtering of fuel trim values.
    Type: Grant
    Filed: September 22, 2005
    Date of Patent: January 9, 2007
    Assignee: General Motors Corporation
    Inventors: Mark D. Carr, Joseph R. Dulzo, Christopher R. Graham, Richard B. Jess, Ian J. MacEwen, Onassis Matthews, Jeffrey A. Sell, Michael J. Svestka, Julian R. Verdejo
  • Evaluating output of a mass air flow sensor
    Patent number: 6955080
    Abstract: A method of evaluating output of a mass air flow sensor. The method includes integrating, over time intervals, mass air flow values corresponding to the time intervals to obtain a running sum of mass of air. The running sum is divided by a total of the time intervals to determine a net mass air flow.
    Type: Grant
    Filed: March 25, 2004
    Date of Patent: October 18, 2005
    Assignee: General Motors Corporation
    Inventor: Julian R. Verdejo