Patents by Inventor Joyce Choi

Joyce Choi 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).

  • Application of model predictive control (MPC)-based forced ramping of process input variables and process output reference trajectory design over a prediction horizon for MPC-based paper machine grade change control
    Patent number: 10969749
    Abstract: A controller reference trajectory design technique to enable high-performing automatic grade change performed by a model predictive control (MPC). Techniques include: (1) automatic determination of appropriate process output reference trajectory delays to enable optimum coordination of process input movements; (2) providing the entire planning process output reference trajectory ramp at the start of the grade change instead of just incrementally as the grade change progresses, again enabling movement of the process inputs to drive process outputs along the planned future path instead of just towards the current target; and (3) use of the process input forced ramping to allow linear ramping of process inputs with optimal coordination of other process input movements to keep all process outputs following the desired trajectories. The technical benefits are faster and higher performing grade changes.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: April 6, 2021
    Assignee: Honeywell Limited
    Inventors: Johan Backstrom, Joyce Choi, Pezhman Nafissi, Michael Forbes
  • Application of Model Predictive Control (MPC)-Based Forced Ramping of Process Input Variables and Process Output Reference Trajectory Design Over a Prediction Horizon for MPC-Based Paper Machine Grade Change Control
    Publication number: 20190064754
    Abstract: A controller reference trajectory design technique to enable high-performing automatic grade change performed by a model predictive control (MPC). Techniques include: (1) automatic determination of appropriate process output reference trajectory delays to enable optimum coordination of process input movements; (2) providing the entire planning process output reference trajectory ramp at the start of the grade change instead of just incrementally as the grade change progresses, again enabling movement of the process inputs to drive process outputs along the planned future path instead of just towards the current target; and (3) use of the process input forced ramping to allow linear ramping of process inputs with optimal coordination of other process input movements to keep all process outputs following the desired trajectories. The technical benefits are faster and higher performing grade changes.
    Type: Application
    Filed: August 22, 2017
    Publication date: February 28, 2019
    Inventors: Johan Backstrom, Joyce Choi, Pezhman Nafissi, Michael Forbes