10. Basic Control House is too cold Furnace Thermostat Controller recognized the house is too cold sends signal to the furnace to turn on and heat the house furnace turns on heats the house natural gas house temperature measured is temperature below setpoint? setpoint = 72°F Controlled variable: temperature (desired output) Input variable: temperature (measured by thermometer in theromostat) Setpoint: user-defined desired setting (temperature) Manipulated variable: natural gas valve to furnace (subject to control)
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14. PI Control Example I = 1.4 gives the best response: quickly brings controller to setpoint without oscillation
15. PI Control Example I = 0.6 gives the best response I = 1.1 borders on instability
18. Feedforward Control Window is open Furnace Feedforward Recognize window is open and house will get cold in the future: Someone reacts and changes controller setpoint to turn on the furnace preemptively. furnace turns on heats the house natural gas house temperature is currently OK turn on furnace Decrease setpoint to turn furnace on Pre-emptive move to prevent house from getting cold
26. APC Application in Wafer Fab Source: Carl Fiorletta, “Capabilities and Lessons from 10 Years of APC Success,” Solid State Technology , February 2004, pg 67-70.
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Hinweis der Redaktion
Advanced Process Control or Advanced Quality Control: reducing process variability, producing more consistent products, increasing process capacity, potential to significantly increase profitability
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