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Some examples of control systems

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Four control systems are illustrated in Figure 10. All can be seen to have the form of Figure 11. A user, uninterested in the mechanics of all this, will see the simpler view of Figure 12. We refer to this single block (that has the control loop hidden inside) as the control system.

The following further points are important:

 

(5) Control system performance can only be meaningfully specified in relation to the (total) control system of Figure 12.

 

(6) The control system designer almost always has to incorporate into the control loop an element whose intrinsic behaviour is largely outside his own influence. (For instance, the control systems designer may have little influence on the design of a building although later he will be called upon to design temperature control systems for it.)

 

(7) To quite a large extent, the controller must neutralize adverse characteristics in the process, compensating for non-ideal process configurations and for short and long term perturbations and variabilities.

 

(8) For (7) to be possible, the process characteristics must be known to some degree of accuracy and be reasonably constant.


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