公开(公告)号：US20250004441A1

公开(公告)日：2025-01-02

申请号：US18754498

申请日：2024-06-26

Applicant: SAMSON AKTIENGESELLSCHAFT

Inventor： Christian Fiebiger ,  Andreas Fiebiger

IPC: G05B19/406

Abstract: A method is proposed for identifying the cause of oscillations in a cascaded control loop of a control valve in a controlled process plant, including the following steps: Setpoint value and actual value of the control valve are determined over time. The setpoint value and actual value are checked to see whether they exhibit a continuous oscillation. If an oscillation is detected, the amplitude and period duration are determined. If only the actual value or only the setpoint value oscillates, the period duration is compared with a characteristic period duration of the control valve. If the actual value and setpoint value oscillate, the amplitudes are compared with each other and/or the period duration is compared with a characteristic period duration of the control valve. The cause of the oscillations is identified from the comparisons. With this method, the cause of oscillations in a control loop of a control valve can be narrowed down so that the effort required for troubleshooting in the plant is reduced. Production downtimes can be minimized and costs avoided.

公开(公告)号：US20240255937A1

公开(公告)日：2024-08-01

申请号：US18566167

申请日：2022-05-16

Applicant: Samson Aktiengesellschaft

Inventor： Andreas Fiebiger ,  Christian Fiebiger ,  Tobias Boll

IPC: G05B23/02

CPC classification number: G05B23/0275 ,  G05B23/0224

Abstract: A method for diagnosing a control/regulating system of a process facility having an actuator for setting a process fluid, may include: providing a diagnostic database with assignment of multiple state causes to a respective set of specified system reference properties, where each system reference property is assigned a necessary condition; providing a test database with an assignment of different diagnostic tests for a specified system reference property; detecting an actual system property of the system; determining a first system reference property, the condition of which is satisfied by the actual system property; for at least one state cause with a set of specified system reference properties, for a second system reference property of the set, detecting whether the condition assigned to the second system reference is certain; and ascertaining a diagnostic test the second system reference property.

公开(公告)号：US20240052948A1

公开(公告)日：2024-02-15

申请号：US18005315

申请日：2021-06-28

Applicant: Samson Aktiengesellschaft

Inventor： Christian Fiebiger

IPC: F16K37/00 ,  G05B17/02

CPC classification number: F16K37/0083 ,  G05B17/02

Abstract: In a position closed-loop controller (31) for a valve control device (1) of a process engineering plant (100), comprising a first signal input (11) for a pilot signal, such as a process control signal (pg) from a process closed-loop controller (120) of the process engineering plant (100), a second signal input for a position actual signal (i) with regard to a control valve (35), wherein the position control-loop controller (31) is designed to generate a more particularly pneumatic control variable (g) for an actuator (33) to actuate the control valve on the basis of the pilot signal and the position actual signal (i) and comprises a more particularly pneumatic control output for the control variable (g). According to the invention, the position closed-loop controller (31) is configured to calculate an approximation signal (ap), by means of a configurable closed-loop controller model based on a particular closed-loop controller, more particularly the process closed-loop controller (120), proceeding from the pilot signal, wherein the closed-loop controller model is configured such that a signal generated by the particular closed-loop controller proceeding from the approximation signal (ap) corresponds to the pilot signal.

公开(公告)号：US20230288888A1

公开(公告)日：2023-09-14

申请号：US18006343

申请日：2021-06-22

Applicant: Samson Aktiengesellschaft

Inventor： Christian Fiebiger ,  Baihua Sun ,  David Wagner-Stürz

IPC: G05B15/02 ,  G06F30/28

CPC classification number: G05B15/02 ,  G06F30/28

Abstract: A positioner for a process plant, such as a chemical plant, a power plant, or a food processing plant, may include a control valve for controlling a process fluid flow of the process plant, a pneumatic actuator for actuating the control valve, and positioner electronics for determining and providing a pneumatic control signal for the actuator based on a control variable. The positioner electronics may include a signal receiving interface for receiving the control variable. The positioner electronics may include a computing device configured to determine at least one simulation parameter that characterizes a signal response of the positioner to a received control variable. The positioner electronics may include a signal output interface for outputting the at least one simulation parameter.