Patents by Inventor Deron Craig Littlejohn

Deron Craig Littlejohn 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).

  • Patent number: 11142178
    Abstract: A brake system has a wheel brake and is operable under a non-failure normal braking mode and a manual push-through mode. The system includes a master cylinder operable by a brake pedal during a manual push-through mode to provide fluid flow at an output for actuating the wheel brake. A first source of pressurized fluid provides fluid pressure for actuating the wheel brake under a normal braking mode. A secondary brake module includes a plunger assembly for generating brake actuating pressure for actuating the wheel brake under the manual push-through mode.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: October 12, 2021
    Assignee: ZF Active Safety US Inc.
    Inventors: Blaise Ganzel, Deron Craig Littlejohn
  • Publication number: 20190248348
    Abstract: A brake system has a wheel brake and is operable under a non-failure normal braking mode and a manual push-through mode. The system includes a master cylinder operable by a brake pedal during a manual push-through mode to provide fluid flow at an output for actuating the wheel brake. A first source of pressurized fluid provides fluid pressure for actuating the wheel brake under a normal braking mode. A secondary brake module includes a plunger assembly for generating brake actuating pressure for actuating the wheel brake under the manual push-through mode.
    Type: Application
    Filed: February 14, 2019
    Publication date: August 15, 2019
    Applicant: Kelsey-Hayes Company
    Inventors: Blaise Ganzel, Deron Craig Littlejohn
  • Patent number: 6145939
    Abstract: An improved cold temperature compensation control method for an EH braking system in which cold temperature operation is detected without requiring a temperature sensor. An electronic controller monitors the pressure developed by one or more electrically operated boost units for a characteristic pressure profile that occurs in cold temperature operation of the braking system, and adjusts the control strategy when the characteristic pressure profile is detected. The characteristic pressure profile is deemed by its frequency and amplitude parameters; specifically, a frequency above a threshold frequency, and an amplitude above a threshold amplitude. In a first mechanization, the controller responds to a detected cold temperature operation by reducing the gain of a closed-loop pressure control, while in a second mechanization, the controller responds by switching from the closed-loop pressure control to a closed-loop position control.
    Type: Grant
    Filed: October 22, 1998
    Date of Patent: November 14, 2000
    Assignee: General Motors Corporation
    Inventors: Hsiao Hsiou (Eileen) Chang, Scott Alan Stacey, Deron Craig Littlejohn
  • Patent number: 5762407
    Abstract: A brake system control apparatus comprising: a sensor providing an output signal indicative of operator foot force on a brake pedal; an actuator coupled to wheel brake and controlling a wheel brake force applied by the wheel brake responsive to a control signal; a controller coupled to the sensor and the actuator and including a differentiator (60) receiving the output signal and determining a rate of change of the operator foot force on the brake pedal, a comparator (62) for comparing the rate of change to a predetermined minimum, wherein a rate of change above the predetermined minimum indicates a quick application of brake pedal force by the vehicle driver, a brake gain adjuster (64) for increasing a gain of the brake system when the rate of change is above the predetermined minimum, a brake command generator (72, 74) determining a control signal in response to the increased gain when the rate of change of brake force is above the predetermined minimum and responsive to a base gain when the rate of change
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: June 9, 1998
    Assignee: General Motors Corporation
    Inventors: Scott Alan Stacey, Deron Craig Littlejohn
  • Patent number: 5667286
    Abstract: In a vehicle with a right front wheel brake, a right rear wheel brake, a left front wheel brake and a left rear wheel brake, a brake control system method for distributing a commanded yaw force to the wheel brakes according to the step of distributing the yaw force to the vehicle wheel brakes according to a priority hierarchy wherein each successive vehicle wheel brake in the priority hierarchy is commanded only if a sum of all previous vehicle wheel brakes in the priority hierarchy have not achieved transfer of the commanded yaw force to the vehicle body.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: September 16, 1997
    Assignee: General Motors Corporation
    Inventors: John Francis Hoying, Richard Charles Swortzel, Deron Craig Littlejohn, G. Donald Denney, Bryan Peter Riddiford