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Published byMyrtle Gregory Modified over 9 years ago
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Open-loop control system Closed-loop control system
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Open-loop control system
V2 x In Flow (qi) h V1 x Out Flow (qo) (water level) (water level expected) Control valve (V2) water tank Outlet valve (V1)
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Closed-loop control system
(Controller) Pneumatic valve) x In Flow (qi) h V1 x Out Flow (qo)
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Closed-looped control system
Feedforward path (Disturbance) (Controller) Pneumatic valve (Tank) (water level expected) (water level) (Float system) Feedback path
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Closed-loop control system
(Controller) (Pneumatic valve) (Disturbance) x In Flow (qi) h V1 x Out Flow (qo)
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Advantages and Disadvantages of the control system
Open system Advantages: 1. Less complicated, less number of equipments and cheap 2. Easy maintenance 3. System is quite stable Disadvantages: Need to adjust more frequently once the output has changed
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Advantages and Disadvantages of the control system
Close system Advantages: 1. Eliminating the disturbance Disadvantages: 1. More number of equipments, more complicated and expensive 2. Difficult maintenance 3. There is a problem on stability
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