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Field based process control system with auto-tuning

A process control and self-adjustment technology, applied in the direction of controllers with specific characteristics, general control systems, control/regulation systems, etc., can solve problems such as increasing algorithm complexity and adjustment time

Inactive Publication Date: 2004-10-27
ROSEMOUNT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The need for this preconditioning increases the complexity of the algorithm and the conditioning time
This added complexity makes regulation difficult, if not impossible, to implement a regulation algorithm in applications with limited power, memory, and computing power, such as in field-installed control transmitters

Method used

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  • Field based process control system with auto-tuning
  • Field based process control system with auto-tuning
  • Field based process control system with auto-tuning

Examples

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Embodiment Construction

[0021] SUMMARY OF THE INVENTION The present invention is a process control system with robust self-regulating features and whose operation is computationally simple such that the system can be implemented in a low power field-installed control unit in a process control system.

[0022] figure 1 It is a diagram of an embodiment of a process control system using the present invention. The process control system includes a master controller 10 , a transmitter 12 , a water tank 14 , an input valve 16 and an output valve 18 . The master controller 10 is connected to the transmitter 12 and the input valve 16 through a two-wire control loop 20 . Loop 20 may comprise a 4-20mA or 10-50mA current loop, eg, the loop allows host controller 10, transmitter 12 and valve 16 to communicate with each other by varying the current level in the loop. In alternative embodiments, the master controller 10, the transmitter 12 and the valve 16 communicate with each other on a loop with varying volta...

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PUM

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Abstract

A process control system (100) controls a process (110) through a control output signal (u(t)) based on a set point (YSET) and a measured process variable (y(t)). The process control system (100) includes a control circuit having a set point input, a process variable input and a control output. The control circuit generates the control output signal (u(t)) on the control output as a function of the set point (YSET) received on the set point input and the measured process variable (y(t)) received on the process variable input. An auto-tuning circuit (106) excites the process (110), estimates a process model based on a rising dead time, a rising rate-of-change, a falling dead time and a falling rate-of-change in the measured process variable (y(t)) and then tunes the control function to the process (110) based on the process model. The auto-tuning circuit (106) obtains robust results, but is computationally simple such that the circuit can be implemented with hardware or software in low-power and low-memory applications, such as in field-mounted control units.

Description

technical field [0001] The present invention relates to a low complexity and robust self-regulating industrial process controller that can be used in low power low storage applications, such as a field mounted control unit. Background technique [0002] Field-installed control units include a wide variety of devices such as transmitters, actuators, converters, switches and stand-alone controls. Field-mounted control units are used in process control systems to control processes, measure process variables and generate outputs representing, for example, process variables for communication with a process control loop central controller or field control components such as valves. Loops include two-wire, three-wire and four-wire process control loops. Other loops may also be used, such as optical and radio frequency control loops. [0003] Field-installed control units are installed in locations where current and voltage are specifically limited to provide internal safety. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/02G05B11/42G05B13/04G05B23/02
CPCG05B11/42G05B13/042
Inventor 邹何洪克尔·P·赫斯特朗介·奥里尔科·L·海斯
Owner ROSEMOUNT INC
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