Cork Institute of Technology Bachelor of Engineering (Honours) in Electronic Engineering - Stage 3
Autumn 2008 CONTROL SYSTEMS (Time: 3 Hours)
INSTRUCTIONS: Answer any FOUR questions. Each question is worth 25 marks. You MUST include a list of all MATLAB commands or Simulink diagrams used to answer a question. Marks will be lost if you fail to do this. Examiners: Dr. T O' Mahony Prof. G. Hurley Dr. S. Foley
(a) In your own words clearly explain the difference between an open-loop control system and a closed-loop control system. Include a block diagram illustrating the difference between an open-loop system and a closed-loop system. Give one example of an open-loop system and one example of a closed-loop system. [5 marks]
(b) The thermal response of a domestic central heating system is defined by the differential equation
dT (t ) + 0.003T (t ) = 0.02U (t ) dt
where T(t) is the building
temperature and U(t) is the input signal that switches on/off the electric/gas ..