Methods, apparatuses and systems for controlling a valve based on a combination of a characteristic curve for the valve and a proportional, integral and derivative signal value

A characteristic curve, controller technology, applied in general control systems, control/regulator systems, fluid pressure control in electric mode, etc., can solve overshoot or pressure drop, damage to process plant equipment process equipment itself, equipment overpressure/ Undervoltage is not expected and other problems

Inactive Publication Date: 2017-01-04
TESCOM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, when a given outage is rectified, the process plant controller takes time to reach a stable operating point (e.g., load / unload the associated air loader capacity), resulting in a delay during the associated transition phase. Significant overshoot or pressure drop
[0005] In many cases overvoltage / undervoltage of this process equipment is highly undesirable and can overload or even damage the product
Furthermore, over / undervoltage of process equipment can stop the associated process, or can damage the associated process plant equipment and / or the process equipment itself

Method used

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  • Methods, apparatuses and systems for controlling a valve based on a combination of a characteristic curve for the valve and a proportional, integral and derivative signal value
  • Methods, apparatuses and systems for controlling a valve based on a combination of a characteristic curve for the valve and a proportional, integral and derivative signal value
  • Methods, apparatuses and systems for controlling a valve based on a combination of a characteristic curve for the valve and a proportional, integral and derivative signal value

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Embodiment Construction

[0016] Methods, apparatus and systems are provided for controlling process equipment by combining process equipment characteristic curve based control with PID control. The method, apparatus, and system can provide more stable process equipment pressure control, avoiding process medium pressure spikes and / or process medium pressure drops. In addition, faster process equipment response times can be provided.

[0017] now refer to figure 1 , for example, a process control system 10 for controlling industrial processes such as refineries, pharmaceutical manufacturing processes, power plants, etc., includes a process controller 12 connected to a data historian 14 via a communication network 18 and to a or multiple host workstations or computers 16 . Host workstation or computer 16 may be any type of personal computer, workstation, etc. each having a display screen 17 . Controller 12 may also be connected to field devices 20 - 27 via input / output (I / O) cards 28 and 29 . The com...

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Abstract

A process device control may use a combination of a characteristic curve for the device and a proportional, integral and derivative signal value. The characteristic curve for the device may define operational characteristics of the process device. The proportional, integral and derivative signal value may be representative of process device operational deviations from the characteristic curve.

Description

technical field [0001] The present disclosure relates to the control of process equipment used in process plants. More specifically, the present disclosure relates to the control of process equipment using a combination of a characteristic curve of the equipment and a proportional-integral-derivative signal value. Background technique [0002] Modern process plants (e.g., petroleum processing plants, chemical processing plants, power plants, food processing plants, etc.) include a large number of process devices (e.g., sensors, valves, transmitters, positioners, etc.). Control systems for process equipment typically include closed-loop control (eg, proportional-integral-derivative (PID)) control. [0003] A common problem with closed loop pressure control occurs when the control loop is interrupted during some steps of the associated operating cycle. For example, interruptions typically occur during process plant start-up when inlet and / or outlet valves are closed and whe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418G05D16/20
CPCG05B19/418G05D16/20G05B19/042G05B19/05G05B19/44G05B2219/13095G05B2219/25312G05B2219/42065G05B2219/42122G05B2219/41253G05D16/2013G05B19/4155G05B2219/37591
Inventor C·伦纳德
Owner TESCOM CORP
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