Patent ID: 6317637
Filing Date: 2001-11-13
Classification: G05B,Y10S

Abstract:
A method for performing PID control of a process, the method comprising:receiving a process variable indicative of a state of the process;generating a current control output value in response to receiving the process variable, wherein the current control output value is applied to the process to control the process;wherein said generating the current control output value includes:determining whether a control parameter change has occurred since a last control iteration;calculating the current control output value according to a positional PID algorithm in response to determining that a control parameter change has not occurred since the last control iteration;setting the current control output value equal to a previous control output value, and setting an integrated error to a value consistent with said previous control output value in accordance with a PID control equation, in response to determining that a control parameter change has occurred since the last control iteration.