Perhaps the best way to introduce feedback control systems is to refer to the cruise control system found in most cars. The cruise control system accepts a desired speed command from the driver. The actual speed of the vehicle is measured. This measurement is fed back and subtracted from the commanded speed to produce an error signal. In the above car example, the driver specifies speed commands.
Feedback control is inherently multidisciplinary.
Control engineering involves modeling, analysis, design, and implementation. Modeling, analysis, design, and implementation are all vital components of control systems engineering. When all are considered, the job opportunities for control engineers are excellent. Individuals interested in modeling, analyzing, and designing control systems should note that mathematical maturity is essential. Controlling, for example, a critical communications satellite can not be taken lightly.