Cruise Control

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Cruise Control

• Andrew Huisjen

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Introduction

• Invented by Ralph Teetor
• Blind Engineer
• Didnt like the way his lawyer drove
• Got patent in 1945
• Introduced as option on 1958 Chryslers
• Now installed on nearly 90 of new cars and truck

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System Components

• Vehicle Speed Sensor
• Control Computer
• Throttle Actuator
• Cancellation Switches
• Control Buttons

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Simplified Physical Model

• Friction force vs. Engine force
• Other forces are present in real world situations
• This provides a basis for seeing how the
  principles work

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Simplified Physical Model
Force Equation Model
After Laplace Transform and rearrangement
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Simulink Models
Open Loop Model
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Simulink Models
Closed Loop Model
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Simulink Models
Closed Loop PID Model

• Target Parameters
• No overshoot
• 10-15 seconds to 30 m/s (about 65 mph)

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Simulink Models

• Only P and I are needed to do this well
• Desired response is slow
• Low values of P and I keep instabilities from
  being present, so D is not needed
• P0.6, I0.01, D0

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Simulink Models

• What if a faster response is desired?
• 5-10 seconds, more sporty response
• P0.6, I0.02, D0

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Real World

• Much more complicated than my model
• 1990 Dodge Stealth

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