![]() Imagine you’re driving a car and see a hill ahead. It requires a good understanding of the process and how disturbances affect the output. Unlike feedback control, which reacts to disturbances after they affect the process, feedforward control is a proactive strategy that responds to disturbances before they affect the output. However, their reactive nature means they can be slow to respond, potentially leading to oscillations around the set point before stabilizing. This is an example of a feedback control system: the output (room temperature) is measured and used to adjust the input (heater on or off).įeedback control systems can effectively manage disturbances after they affect the process. When the set point is reached, the thermostat turns off the heater. If the actual temperature is lower than the set point, the thermostat turns on the heater. The difference between the set point and the process variable is the error. The thermostat measures the actual temperature in the room (the process variable) and compares it to the set point. The desired temperature (set point) is set on the thermostat. In this strategy, the control action is based on the output of the system.Ĭonsider the example of a home thermostat controlling a heating system. Feedback Controlįeedback control is the most common type of control system. Feedback, feedforward, and cascade control are three primary types of control strategies used in process control systems.
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