Patents by Inventor Lisheng Cao

Lisheng Cao 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).

  • Controller apparatus having improved transient response speed by means of self-tuning variable set point weighting
    Patent number: 5404289
    Abstract: A process control apparatus varies a setpoint weighting factor .beta. according to both an error signal and a measurable dynamic characteristic of the process. The dynamic characteristic is either in terms of the normalized gain or normalized dead time of the process. For a PID controller, an initial value of the initial setpoint weighting factor .beta., a time at which the initial value should be varied, and the new value of the factor are all automatically set by a self-tuning procedure, wherein a processor is programmed to execute a set of correlation formulae which is applicable to a wide range of industrial processes.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: April 4, 1995
    Assignee: National University of Singapore
    Inventors: Chang C. Hang, Lisheng Cao