A closed loop controller therefore has a feedback loop which ensures the controller exerts a control action to give a process output the same as the " Reference input " or " set point ".
12.
A closed loop controller therefore has a feedback loop which ensures the controller exerts a control action to give a process output the same as the " reference input " or " set point ".
13.
Most digital cameras achieve focus through analysis of the image captured by the objective lens and distance estimation, if it is provided at all, is only a byproduct of the focusing process ( closed-loop controller ).
14.
The metering signal is used by a closed-loop controller that regulates the high voltage by controlling inverter input power, and it may also be conveyed out of the power supply to allow external circuitry to monitor the high voltage output.
15.
The MAF sensor provides the open-loop controller predicted air flow information ( the measured air flow ) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
16.
The roof was designed by SCX Special Projects Ltd and controls for mobilising the roof were designed by Fairfield Control Systems Ltd . and Moog who supplied the electric control system comprising electric actuators, servo motors, servo drives and closed-loop controllers.
17.
For instance, in problems of cascaded controller tuning, the internal loop controller structure can belong to a conventional regulator of three parameters, whereas the external loop could implement a linguistic controller ( such as a fuzzy system ) which has an inherently different description.
18.
If the load were not predictable, on the other hand, the motor's speed might vary as a function of the load as well as of the voltage, and an open-loop controller would therefore be insufficient to ensure repeatable control of the velocity.
19.
In an "'open-loop controller "', also called a "'non-feedback controller "', the control action from the controller is independent of the " process output ", which is the process variable that is being controlled.
20.
If a velocity loop PID controller is being used to control the speed of the load and command the force being applied by the actuator, then it is beneficial to take the desired instantaneous acceleration, scale that value appropriately and add it to the output of the PID velocity loop controller.
