APC UCCS Temperature Control User Manual download pdf (Page 7)

ECE4510/ECE5510, INTRODUCTION TO FEEDBACK CONTROL 1–7

1.3: A ﬁrst analysis: Auto cruise control

As an example, suppose that we wish to design a cr uise-control

system for an automobile.

Generically, we wish to control the car’s speed (and possibly

acceleration proﬁle).

Following our design methodology, steps 1–2 are:

1. Output sensor = speedometer.

2. Actuator = throttle and engine.

Block diagram:

Desired

Speed

Actual

Speed

Road Grade

Plant

Auto Body

Output

Sensor

Speedometer

Sensor Noise

Compen-

sator

Actuator

Engine

Throttle

Control

Variable

Measured

Speed

3. Model of system:

1. Operate system ≈ 55 MPH. Assume linear response near 55 MPH.

2. Measure: 1 % change in throttle # 10 MPH change in speed.

3. Measure: 1 % change in grade # 5MPHchangein speed.

4. Measure: Speedometer accurate to a fraction of 1 MPH, so is

assumed exact.

Lecture notes prepared by and copyright

! 1998–2013, Gregory L. Plett and M. Scott Trimboli

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APC UCCS Temperature Control User Manual Page 7