Give 10 example of close loop control system?

Answer 1

1. lightswitch --> light

2. Toaster --> toast (For timer-based toasters, only -- see below)

3. Water faucet --> water flow amount

4. Water faucets (hot/cold) --> water temperature in the sink or shower.

5. Temperature setting for the stovetop --> heat to cook food

6. TV remote control

7. Clothes dryer (timer based)

8. Volume on a stereo / home entertainment system

9. shades / blinds on a window --> 'regulating' the amount of light coming in from the outside.

10.

Closed loop:

1. Thermostat --> furnace (constant temperature)

2. Toaster setting (light/dark) --> toast (IF the toaster has heat sensors)

3. Refrigerator cold/hot setting --> refrigerator inside temperature (constant)

4. Temperatue setting for oven (not stovetop) --> oven temperature constant

5. Clothes dryer with moisture sensor

6. Washing machine water level

Answer 2

My favorite example of a closed-loop control system would be a digital servo motor connected to a motion controller. An exmple: The motion controller executes a program that is written to move a linear axis 10 feet. Other parameters are included. The velocity is 1 foot/second. The acceleration limit is 1 foot/second2. In a torque-loop mode, the motion controller sends an output signal to the servo drive which is proportional to the desired torque of the motor. The servodrive then begins to commutate the servomotor, causing motion. The servomotor has a resolver or encoder, which provides position feedback to the servodrive and motion controller. By taking a derivative, the controller knows the current velocity, and another derivative yields the current acceleration of the motor/axis. This feedback is used for a PID loop calculation. The PID takes a given setpoint value (say the desired velocity for an instant in time) and the current value (the actual velocity), and subtracts them to calculate an error term. The PID then acts on a Proportion of this error, the Integral of the error over time, and the Derivative or rate of change of the error. This new commanded value is sent to the motor. Thus, our system looks like this:

[Motion Controller]--torque command-->[ServoDrive]--commutated output-->[Motor][Encoder]

^^|

|--------Position Feedback-------------------|---------------------

Answer 3

An open loop system has no feedback. So if you had a resistance heater with an on/off switch and no thermostat it would just continually supply heat without regard to the temperature of the room. To stop the heat you would turn it off. In essence you become the feedback.