IntelliCruise: Intelligent GPS-based Cruise Control System

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IntelliCruiseIntelligent GPS-basedCruise
Control System

• Lawrence Han, Sundeep Kartan, Roger Serwy
• April 25, 2007
• ECE 445
• Group 14

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Introduction

• Allows car to automatically adjust to changing
  speed limits
• Brings first level of automatic control to drivers

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Purpose

• Free driver from speed management
• Improve driver safety allow to focus on road
• Fewer speeding tickets

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System Features

• Simple, intuitive user interface
• Can interface to vehicles with existing cruise
  control system

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Design Overview

• Use GPS and database to find legal speed limit
  for current road
• Set vehicle cruise control system to legal or
  otherwise desired speed
• Provide interface for driver to adjust system
• Use LCD and LEDs to provide feedback to driver

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Block Diagram
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Development

• Garmin 12XL GPS transponder to laptop
• Serial communication of NMEA 0183 data
• Cruise control relay interface
• Verification of digital logic switching circuit
• Parallel port pin control
• Control of individual parallel port pins

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Development (Contd)

• IntelliCruise algorithm
• Profile behavior of existing car cruise control
  system
• State machine sequence for speed control
• Velocity feedback issues

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Development (Contd)

• IntelliCruise algorithm (Contd)
• System behavior
• Activates when within 2 MPH of target
• Deactivates when 5 MPH under target
• Functions at speeds greater than 25 MPH

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Development (Contd)

• Mapping GPS to speed limit
• Vector database of latitude and longitude
  coordinates mapped to street then to legal speed
  limit
• LCD display
• Initialization code
• Interfacing with computer

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Development (Contd)

• User interface
• Five buttons On, Off, Decrease speed, Increase
  speed, Return to legal speed
• Full system test

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Schematic
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System Photographs
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System Photographs
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Successes

• Were able to implement system as specified
• Were able to control system
• Naïve GPS database search algorithm still
  functioned

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Challenges

• Failure of first vehicle needed to redesign
  state machine
• 1.2 second delay on speed information required
  interpolation of speed
• LCD interfacing was difficult
• Few remaining software glitches
• Were not able to use TIGER database

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Recommendations

• Integration directly with vehicle
• With cruise control system
• Speed information
• Navigation system if exists
• Brake signal
• With adaptive cruise control system
• Use more accurate, faster GPS system
• Allow user to update database

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Usability

• Concerns about system being intrusive to driver
• May affect driving skills negatively as driver is
  distracted by interface

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Ethics

• Breaking speed laws
• Driver chooses to violate laws and override legal
  speed limit
• Driver becomes less aware of posted speed limits
• Using system in inappropriate road conditions
  eg, rain, road construction, heavy traffic
• Accuracy of database

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Conclusion

• Proof of concept successful
• Viable value-added proposition for automobile
  manufacturers and OEMS
• If cruise control and navigation systems exist,
  system is very inexpensive to implement
• If use propagates, can smoothen traffic patterns

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Credits

• Austin Kirchoff
• Professor Gary Swenson
• Xi Luo
• Zach Borgman
• ECE Parts Shop
• ECE Machine Shop