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3.2 CONTROL SYSTEM CHARACTERISTICS
Control systems are present in most systems we see. Example - elevator height.
Some systems are naturally unstable and tend to self destruct. Example - balanced broom.
Other systems are self regulating, and tend to some stable state - these are good candidates for open loop control. Example - city water tank
Other systems need some sort of regulation mechanisms added, these are called closed loop systems. Example - car cruise control
If a system is simple we will say that it is linear. Example - perfect elevator
A system can be subject to complicating factors that make it difficult/impossible to model mathematically. Example - elevator in tall building with stretchy cable
If a system has switched states it can be described as discrete. Example - buttons to call elevator, open/close doors
Temporal/sequential systems can change over time, this requires sequential control. Example - washing machine
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