СПОСОБ И УСТРОЙСТВО ДЛЯ УПРАВЛЕНИЯ РЕГУЛИРУЮЩИМ КЛАПАНОМ ПОСРЕДСТВОМ ЦЕПИ УПРАВЛЕНИЯ, А ТАКЖЕ ДЛЯ ВЫЯВЛЕНИЯ НЕИСПРАВНОСТЕЙ В ЭТОЙ ЦЕПИ

摘要

The present invention discloses a method of detecting faults in a control loop for a control valve (10) having a throttling element coupled to a pneumatically operated actuator (12), the control loop including a pneumatic amplifier (26) operatively coupled to the actuator (12) and having a control fluid valve assembly responsive to a control pressure signal for controlling flow of control fluid to the actuator, and an I/P converter (24) operatively coupled to the pneumatic amplifier (26) for generating the control pressure signal in response to an I/P drive signal, wherein the I/P drive signal is based on a reference outlet pressure signal, the method comprising: storing a normal range for a control parameter of the control loop; triggering a fault signal for operation of the control parameter outside the normal range; characterizing operating parameters of the control loop during the fault signal to derive a fault template; comparing the fault template to sets of stored operating parameters associated with specific component failures; and identifying at least one specific component failure having a set of stored operating parameters that matches the fault template.