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Control system
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==On–off control== {{main|Bang–bang control}} On–off control uses a feedback controller that switches abruptly between two states. A simple bi-metallic domestic [[thermostat]] can be described as an on-off controller. When the temperature in the room (PV) goes below the user setting (SP), the heater is switched on. Another example is a pressure switch on an air compressor. When the pressure (PV) drops below the setpoint (SP) the compressor is powered. Refrigerators and vacuum pumps contain similar mechanisms. Simple on–off control systems like these can be cheap and effective.
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