§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0077685A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Industrial process control system

Assignee: Honeywell Inc
•
Filing: 1982-10-19
•
Granted: —
•
Expires: 2002-10-19
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An industrial process plant has data concerning its inputs and outputs fed to a control apparatus which optimizes operation by an optimization procedure using linear programming. The plant includes components which can be switched between idle and run states. A process model representing the plant includes a plurality of constraint functions and an objective function which is to be minimized or maximized, the latter function including terms for each idle/run component representing a change in its status. A model updating procedure updates the parameters of the process model in accordance with the current process state, including setting the signs of the coefficients of the idle/run component terms in dependence on the current statuses of those components so that each such term makes a positive cost contribution to the objective function in the event of a change of status. A scheduling procedure operates the optimization procedure at fixed intervals and/or whenever the current state differs sufficiently from the most recent state set by the optimization procedure, or under operator control.

Inventors

  • 👤 Brian C. Horn

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 05:08
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/04

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 200 words
In a process plant, control apparatus which is fed with data concerning the inputs and outputs of the process and optimizes the operation of the plant, comprising: a process model which represents the process by means of an objective function and a plurality of constraint functions; an optimization procedure which determines, from the process model and the current state of the process, the optimum state of the process; a model updating procedure which updates the parameters of the process model in accordance with the current state of the process; and a scheduling procedure which determines when the optimization procedure and model updating procedure shall be performed, characterized in that the plant includes a plurality of discontinuously operable process components each of which can have an idle or a run status; the process model includes, in its objective function, a term for each idle/run component representing a change in its status; and the model updating procedure sets the sign of the coefficient of each such term in dependence on the current status of the associated component so that the term makes a positive cost contribution to the objective . function in the event of a change of status of the component.
Claim 2
Dependent Claim 200 words
In a process plant, control apparatus which is fed with data concerning the inputs and outputs of the process and optimizes the operation of the plant, comprising: a process model which represents the process by means of an objective function and a plurality of constraint functions; an optimization procedure which determines, from the process model and the current state of the process, the optimum state of the process; a model updating procedure which updates the parameters of the process model in accordance with the current state of the process; and a scheduling procedure which determines when the optimization procedure and model updating procedure shall be performed, characterized in that the plant includes a plurality of discontinuously operable process components each of which can have an idle or a run status; the process model includes, in its objective function, a term for each idle/run component representing a change in its status; and the model updating procedure sets the sign of the coefficient of each such term in dependence on the current status of the associated component so that the term makes a positive cost contribution to the objective . function in the event of a change of status of the component.
Claim 3
Dependent Claim 16 words
Control. apparatus according to Claim 1, characterized in that the scheduling procedure operates at predetermined intervals.
Claim 4
Dependent Claim 21 words
Control apparatus according to either previous claim, characterized in that the scheduling procedure is operable in response to an operator input.
Claim 5
Dependent Claim 39 words
Control apparatus according to any previous claim, characterized in that the scheduling procedure compares the current process state with the most recent process state determined by the optimization process and operates when the two differ by a predetermined amount.
Claim 6
Dependent Claim 28 words
Control apparatus according to any previous claim, characterized in that the optimization procedure solves a mixed integer linear program with a logic variable for each run/idle process component.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag