1. Introduction to Control Systems
DEU-MEE 5017 Advanced Automatic Control

4. Examples of control system
Example 1.1: Temperature control at a home
Example 1.2: Cruise control for a car
Example 1.3: Control of mechanical systems

5. : Reference temp. : Measured temp. : Disturbance
Example 1.1: Temperature control at a home
: Reference temp.
Controller
(Thermostat)
Temperature Sensor
: Measured temp.
: Disturbance
Control signal
(heat transfer: door,
window, wall, etc.)
Fuel flow
Heater
Valve
a) Open loop control: +
Valve +
Plant
Sensor
b) Closed loop control: + +
Controller
Valve +
Plant
Sensor -

6. Example 1.2: Cruise control for a car
Fp: Pushing force (from engine)
Fd: Distrubance (wind, gravity, enviromental factors, etc.)
a) Open loop block diagram: (Schematically)
b) Closed loop block diagram: (Schematically)

7. Gc(s)=Kp (Proportional control)
Example 1.2: Cruise control for a car (Continue)
Fp: Pushing force (from engine)
Fd: Distrubance
Fd=0
Fd=-mgsin
a) Open loop control: - Ke +
G(s) Ks
b) Closed loop control:
Gc(s)=Kp (Proportional control) - +
Gc(s) Ka
G(s) Ke + Ks -

8. References
Open course lecture notes, Massachusetts Institute of Technology, Department of Mechanical Engineering, Dynamics and Control II, Spring Term