초록 ▼

A control apparatus is disclosed that comprises a primary proportional, integral, differential ("PID") controller capable of receiving a first setpoint and a first process variable and generating therefrom a second setpoint; and a secondary controller capable of receiving the second setpoint and a s

A control apparatus is disclosed that comprises a primary proportional, integral, differential ("PID") controller capable of receiving a first setpoint and a first process variable and generating therefrom a second setpoint; and a secondary controller capable of receiving the second setpoint and a second process variable and generating therefrom an output control signal, wherein the primary PID controller is capable of receiving from the secondary controller a feedback signal 1) that indicates that a previous value of the second setpoint exceeds a limit associated with an output control signal of the secondary controller, and 2) that transfers a value of a signal from the secondary controller. The primary PID controller is then capable of limiting the contribution of the integral calculation component in a PID calculation that generates a new current value of the second setpoint. The integral calculation component may be excluded, included, or partially included in the PID calculation in order efficiently minimize the effect of undesirable erratic output signals.

대표청구항 ▼

1. A control apparatus for controlling a process, said control apparatus comprising:a primary proportional, integral, differential (PID) controller capable of receiving a first setpoint and a first process variable and generating therefrom a second setpoint; and a secondary controller capable of rec

1. A control apparatus for controlling a process, said control apparatus comprising:a primary proportional, integral, differential (PID) controller capable of receiving a first setpoint and a first process variable and generating therefrom a second setpoint; and a secondary controller capable of receiving said second setpoint and a second process variable and generating therefrom an output control signal, wherein said primary PID controller is capable of receiving from said secondary controller a feedback signal that indicates that a previous value of said second setpoint exceeds a limit associated with said output control signal and that transfers a value of a signal from said secondary controller and, in response to said feedback signal indication, said primary PID controller one of: excludes an integral calculation component of a PID calculation performed by said primary PID controller in response to a determination that the current sum of a proportional calculation component and a derivative calculation component of said PID calculation exceeds said previous value of said second setpoint; and includes a portion of said integral calculation component in response to a determination that the inclusion of said integral calculation component in said current PID calculation would otherwise cause said current value of said second setpoint to exceed said previous value of said second setpoint.