Control systems

Question 1

Control system

Answer 1

Simple or complex
Components are:
1. system
2. controller
3. control
4. reference value
5. output value

Question 2

Control theory

Answer 2

the mathematical description of the behaviour of a control system

Question 3

Control engineering

Answer 3

the application of control theory (the mathematical description of the behaviour of a control system) combined with the knowledge of the design and behaviour of the system and controller technology to produce stable and predictable systems which produce outputs that match a reference value

Question 4

Types of system

Answer 4

chemical, mechanical, electrical, financial, biological

Question 5

Open loop system main overall feature

Answer 5

controls the initial settings (there is a controller) but doesn’t monitor the output , so it cannot compensate for disturbances

Question 6

Example of open loop system

Answer 6

sprinkler system

Question 7

Draw a schematic of an open loop system

Answer 7

initial settings –> controller –> system input = controller output –> system –> system output

Question 8

Describe the flow of a closed loop system

Answer 8

reference value is inputted into the controller
the controller sets initial settings based on the reference value
the initial measured error should be 0
the controller outputs a system input
the system output is measured by the sensor
the signal is compared to the reference value and the measured error is calculated
new initial settings which are altered by a factor equal to the measured error are inputted into the controller
the process repeats

Question 9

main important feature of a closed loop system

Answer 9

feedback: correction is based on the difference between the output signal measured by the sensor and the input reference