Method and apparatus for monitoring process transitions

• US 7,233,882 B2
• Filed: 11/02/2004
• Issued: 06/19/2007
• Est. Priority Date: 11/14/2000
• Status: Expired due to Fees

• Current Assignee: National University of Singapore
• Original Assignee: National University of Singapore
• Inventors: Srinivasan, Rajagopalan, Viswanathan, Pradeep Kumar, Vedam, Hiranmayee, Sundarraman, Anandakrishnan, Ananthanarayanan, Nochur
• Primary Examiner(s): Hoff; Marc S.
• Assistant Examiner(s): O MALLEY, MARY CATHERINE
• Application Number:
  US10/979,937
• Publication Number:
  US 20050114078A1
• Time in Patent Office: 959 Days
• Field of Search: 702/183, 702/185, 702/188, 702/182, 700 28- 31
• US Class Current: 702/188
• CPC Class Codes: G05B 23/021 adopting a different treatment of each operating region or a different mode of the monitored system, e.g. transient modes; different operating configurations of monitored system
• CPC Class Codes: G05B 23/024 Quantitative history assessment, e.g. mathematical relationships between available data; Functions therefor; Principal component analysis [PCA]; Partial least square [PLS]; Statistical classifiers, e.g. Bayesian networks, linear regression or correlation analysis; Neural networks
• CPC Class Codes: G05B 23/0264 Control of logging system, e.g. decision on which data to store; time-stamping measurements

Abstract

A method for identifying modes and transitions during plant operation, wherein measured values of process variables are used to evaluate a current state of the process and its sections and subsections. An identified state of the plant is signaled and the plant is monitored for normal execution of any transition, identifying a current task being performed in the process and sending a message to different sections of the plant. Results are displayed on a visual display device and can be sent to other plant computer programs for guidance during the transition. A permanent chronological record of the sequence of events—modes and transitions—of the plant and sections and subsections including the pertinent plant conditions and information is generated for subsequent review and analysis.

Claims

1. A method for aiding human operators in managing process transitions in operation of a complex process facility, the transitions comprising start-up of the facility, shut down of the facility, and switching the facility from a normal state to a different state of facility operation, the method comprising the steps of:

assimilating data generated by sensors disposed on-line to monitor the processing operations and transitions in the process;

inferring a state of the process and process transitions from the assimilated data;

identifying a current state of a process transition and kinds of abnormalities and extent of deviation from normalcy in any of shape, magnitude, and time and signaling same to the human operator of the facility with information relative to the current state of the process, facts relative to state of the process, facts relative to bounds of process variables, and expected and observed trends in such variables, steps in transition which have been completed, and steps in the transition which are still to be executed; and

generating a permanent record of system conditions and providing at least portions of the record to the human operator to support decision making by the human operator and to facilitate operator interaction in the transition to obtain normal execution of operating procedure during the transition; and

continuously tracking the execution of the transition process and resulting changes in values of process variables by the facility.