Patent ID: 8224475

Claim:
A method comprising: setting a first variable to a baseline operation time; setting a second variable to a theoretical operation rate; operating a piece of equipment under advanced process control as a function of each of the first and second variables; thereafter measuring first and second parameters that are different and that each relate to the operation of the equipment; calculating an actual rate achieved during the operating, the actual rate being a function of the second parameter and the first variable, wherein the calculating of the actual rate includes dividing the second parameter by the first variable; calculating a new value for the second variable as a function of the actual rate and the current value of the second variable; calculating a new value for the first variable as a function of the baseline operation time and the new value for the second variable; and thereafter repeating the operating, the measuring, the calculating the actual rate, the calculating the new value for the second variable, and the calculating the new value for the first value.