A Closed loop system is identified by a feedback loop, it can be describe as a system where there is possibility of applying corrective measures if the output is not quite what is wanted. A good example of this in a vehicle is an Automatic Temperature Control System. The Interior Temperature of the vehicle is determined by the Output from the Heater which is switched On or Off in responce to a signal from a Temperature Sensor inside the Cabin. The feedback loop is the fact that the Output from t