Patents by Inventor Robert CALDERWOOD

Robert CALDERWOOD 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).

  • Electrical monitoring of gaseous fuel admission valves
    Patent number: 10208683
    Abstract: A method of evaluating operability of a gaseous fuel admission valve of an internal combustion engine is disclosed. The method includes operating the internal combustion engine on gaseous fuel by repeatedly actuating the gaseous fuel admission valve. The method further includes measuring a sequence of temporal developments of an electrical operation parameter respectively associated with an actuation of the gaseous fuel admission valve. The sequence includes a first temporal development to be evaluated and a plurality of temporal developments preceding the first temporal development. The method also includes evaluating operability of the gaseous fuel admission valve based on the first temporal development of the measured sequence and at least one of the plurality of preceding temporal developments of the measured sequence.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: February 19, 2019
    Assignee: Caterpillar Motoren GmbH & Co. KG
    Inventors: Eike Joachim Sixel, Hannes Marscheider, Daniel Wester, Arvind Sivasubramanian, Travis Barnes, Chris Gallmeyer, Jedediah A. Frey, Andrew J. Neaville, Robert Calderwood
  • ELECTRICAL MONITORING OF GASEOUS FUEL ADMISSION VALVES
    Publication number: 20150252737
    Abstract: A method of evaluating operability of a gaseous fuel admission valve of an internal combustion engine is disclosed. The method includes operating the internal combustion engine on gaseous fuel by repeatedly actuating the gaseous fuel admission valve. The method further includes measuring a sequence of temporal developments of an electrical operation parameter respectively associated with an actuation of the gaseous fuel admission valve. The sequence includes a first temporal development to be evaluated and a plurality of temporal developments preceding the first temporal development. The method also includes evaluating operability of the gaseous fuel admission valve based on the first temporal development of the measured sequence and at least one of the plurality of preceding temporal developments of the measured sequence.
    Type: Application
    Filed: March 5, 2015
    Publication date: September 10, 2015
    Applicant: Caterpillar Motoren GmbH & Co. KG
    Inventors: Eike Joachim SIXEL, Hannes MARSCHEIDER, Daniel WESTER, Arvind SIVASUBRAMANIAN, Travis BARNES, Chris GALLMEYER, Jedediah A. FREY, Andrew J. NEAVILLE, Robert CALDERWOOD