Patents by Inventor Douglas I. Norman

Douglas I. Norman 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).

  • Fan speed control system
    Patent number: 7863839
    Abstract: A fan speed control system for a machine is disclosed. The control system may include a fan to provide a flow of coolant to the machine. The system may further include a first sensor configured to generate a first signal indicative of an operational parameter of the machine, a second sensor associated with the fan to generate a second signal indicative of an actual speed of the fan, and a controller communicatively coupled to the fan, the first sensor, and the second sensor. The controller may be configured to generate a third signal indicative of a desired fan speed based on the first signal, and a fourth signal indicative of a difference between the desired fan speed and the actual fan speed. The controller may drive the fan based on the third signal and the fourth signal.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: January 4, 2011
    Assignee: Caterpillar Inc
    Inventors: Scott Richard Schuricht, Douglas I. Norman, Paul W. Peresta, Arvil Duane Wilson
  • Fan speed control system
    Publication number: 20080238607
    Abstract: A fan speed control system for a machine is disclosed. The control system may include a fan to provide a flow of coolant to the machine. The system may further include a first sensor configured to generate a first signal indicative of an operational parameter of the machine, a second sensor associated with the fan to generate a second signal indicative of an actual speed of the fan, and a controller communicatively coupled to the fan, the first sensor, and the second sensor. The controller may be configured to generate a third signal indicative of a desired fan speed based on the first signal, and a fourth signal indicative of a difference between the desired fan speed and the actual fan speed. The controller may drive the fan based on the third signal and the fourth signal.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Inventors: Scott Richard Schuricht, Douglas I. Norman, Paul W. Peresta, Arvil Duane Wilson