19-01-2013, 01:11 PM
Control Systems
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Types of control Systems
1-Open-Loop Control Systems : utilize a controller or control actuator to obtain the desired response, These systems are simple in construction, stable and cost cheap. But these systems are inaccurate and unreliable. Moreover these systems do not take account of external disturbances that affect the output and they do not initiate corrective actions automatically.
2-Closed-Loop Control Systems : utilizes feedback to compare the actual output to the desired output response, An open loop control system becomes a closed loop control system by including a feedback. This feedback will automatically correct the change in output due to disturbances. This is why a closed loop control system is called as an automatic control system, The feedback control system takes into account the disturbances also and makes the corrective action.