Patents by Inventor John F. Schweikert

John F. Schweikert 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).

  • EGR diagnostic system
    Patent number: 4671107
    Abstract: A system is described for diagnosing the operation of an exhaust gas recirculation system of an internal combustion engine having a speed density fuel delivery system and having a closed loop fuel adjustment. The EGR system operation is determined by disabling the EGR system and observing the magnitude of change of the integral adjustment of the closed loop system.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: June 9, 1987
    Assignee: General Motors Corporation
    Inventors: Alan F. Chiesa, LeRoy E. Medendorp, Edward C. Perry, John F. Schweikert
  • Tip-in knock eliminating spark timing control
    Patent number: 4428343
    Abstract: A spark timing control system for an internal combustion engine is responsive to a changing engine operating parameter signalling an engine tip-in event to retard spark timing by an amount sufficient to eliminate tip-in knock and for a predetermined time period ending 175-300 milliseconds after initiation of the tip-in event, so that no perceptible engine performance loss results.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: January 31, 1984
    Assignee: General Motors Corporation
    Inventors: John F. Schweikert, David S. Grossman, Edward E. Durham
  • Closed loop air/fuel ratio controller with asymmetrical proportional term
    Patent number: 4228775
    Abstract: A closed loop air/fuel ratio controller for an internal combustion engine includes a control circuit responsive to the output of an exhaust gas sensor representing at least the sense of deviation of the air/fuel ratio of the mixture supplied to the engine from stoichiometry and provides a control signal which is used to adjust the air/fuel ratio of the mixture supplied to the engine in direction tending to restore a stoichiometric air/fuel ratio. The control signal includes an integral correction term and an asymmetrical proportional correction term that abruptly shifts the value of the control signal upon a detected change in at least one direction in the sense of the deviation of the air/fuel ratio from a stoichiometric air/fuel ratio.
    Type: Grant
    Filed: November 17, 1978
    Date of Patent: October 21, 1980
    Assignee: General Motors Corporation
    Inventor: John F. Schweikert