Patents by Inventor Jeffery T. Fischer

Jeffery T. Fischer 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).

  • Fuel control system
    Patent number: 7072757
    Abstract: An apparatus and method of controlling an engine by determining the state of an ignition command device and the speed of an engine and operating a fuel pump during a predetermined period in response to the ignition command device being in a predetermined state and the speed being substantially zero.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: July 4, 2006
    Assignee: Caterpillar Inc.
    Inventors: Robert E. Adams, Douglas M. Chevalier, Jeffery T. Fischer, Robert C. Griffith, Jr., Bin He, Diane M. Laugel
  • Fuel control system
    Publication number: 20030217721
    Abstract: An apparatus and method of controlling an engine by determining the state of an ignition command device and the speed of an engine and operating a fuel pump during a predetermined period in response to the ignition command device being in a predetermined state and the speed being substantially zero.
    Type: Application
    Filed: October 29, 2001
    Publication date: November 27, 2003
    Inventors: Robert E. Adams, Douglas M. Chevalier, Jeffery T. Fischer, Robert C. Griffith, Bin He, Diane M. Laugel
  • Method for achieving minimum liquid pilot fuel delivery to each cylinder of a dual fuel engine while operating in a dual fuel mode
    Patent number: 6289871
    Abstract: A method for controlling and adjusting the delivery of liquid pilot fuel to each cylinder of a dual fuel engine during a dual fuel operating mode so as to both minimize the quantity of liquid pilot fuel being delivered to each individual cylinder while, at the same time, ensuring that such minimum quantity of liquid pilot fuel provides complete combustion performance within each such cylinder wherein certain cylinder performance parameters such as exhaust port temperature or cylinder pressure are evaluated on a per cylinder basis in order to determine cylinder performance. The present method establishes certain predetermined incremental changes in the selected cylinder performance parameters, which changes are indicative of poor or deteriorated combustion performance within any particular cylinder, and thereafter varies the amount of liquid pilot fuel delivered to such cylinder based upon an analysis and evaluation of changes occurring in the selected cylinder performance parameters.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: September 18, 2001
    Assignee: Caterpillar Inc.
    Inventors: Scott C. Brown, Jeffery T. Fischer, Martin L. Willi
  • Method and apparatus for relieving a differential pressure across a gaseous fuel admission valve of a dual fuel engine
    Patent number: 5868121
    Abstract: A fuel pressure relief system for a dual fuel engine including at least one gaseous fuel admission valve positioned between a gaseous fuel inlet region and an air intake region is provided. The system includes a first pressure sensor positioned in the gaseous fuel inlet region and a second pressure sensor positioned in the air intake region. An electronic controller is connected to the first pressure sensor and the second pressure sensor. A gaseous fuel vent path extends between the gaseous fuel inlet region and a portion of an air intake path of the engine. A vent valve is positioned along the gaseous fuel vent path and is connected to the electronic controller for control thereby. When the differential pressure across the gaseous fuel admission valve exceeds a predetermined level the fuel vent valve is opened to relieve the pressure.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: February 9, 1999
    Assignee: Caterpillar Inc.
    Inventors: Scott C. Brown, Jeffery T. Fischer, Eric W. Ohlson, Martin L. Willi