公开(公告)号：DE69719715D1

公开(公告)日：2003-04-17

申请号：DE69719715

申请日：1997-07-11

Applicant: ROSEMOUNT INC

Inventor： ZOU HEHONG ,  BRIGHAM E

IPC: G05B13/04 ,  G05B23/02 ,  G05B13/02

Abstract: A process control system controls a non-self regulating process through a control output signal based on a set point and a measured process variable. The process control system 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 on the control output as a function of the set point received on the set point input and the measured process variable received on the process variable input. An auto-tuning circuit excites the process, estimates a process model based on an intersection between rising and falling asymptotes of the measured process variable, and then tunes the control function to the process based on the process model. The auto-tuning circuit 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 controllers.

公开(公告)号：DE69719715T2

公开(公告)日：2003-09-11

申请号：DE69719715

申请日：1997-07-11

Applicant: ROSEMOUNT INC

Inventor： ZOU HEHONG ,  BRIGHAM E

IPC: G05B13/04 ,  G05B23/02 ,  G05B13/02

Abstract: A process control system controls a non-self regulating process through a control output signal based on a set point and a measured process variable. The process control system 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 on the control output as a function of the set point received on the set point input and the measured process variable received on the process variable input. An auto-tuning circuit excites the process, estimates a process model based on an intersection between rising and falling asymptotes of the measured process variable, and then tunes the control function to the process based on the process model. The auto-tuning circuit 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 controllers.