A control system is an essential requirement to manage all the inputs, outputs and other functions of any system, such as electrical or monitoring, in which different parts, systems and equipment must work together to achieve a common purpose.
A control system uses inputs from various sensors to drive actuators to control part of a system.
Rolls-Royce uses control systems across all of its business sectors to control the equipment, performance and output.
For a marine vessel propulsion system (below), it is clear that all the components must work together in order to propel the ship.
(Click image to enlarge)
On large civil aircraft the engine need to respond to the input from the operator and external sources.
The operator wants to fly faster and, via the throttle, send an input signal to the control system. The control system processes the signal and based on internal algorithms sends output signals to the engine to act accordingly to make the aircraft fly faster.