LOW SPEED AUTOMOBILE COLLISION PREVENTION by xri35382

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									LOW SPEED AUTOMOBILE
 COLLISION PREVENTION

       Scott DiBasilio
     Kenneth Maciejewski
         Project 22

      TA: Jon Wheeler
      Professor Swenson
               Motivation

• More cars on road everyday
• Increased congestion in parking lots
• More SUVs on road; difficult to parallel
  park
                          Statistics

• Typical Body Shop:
  • 15-20 low-speed auto collision repairs per week
  • $1500-$3000 range per repair




  Source: A&L Auto Body
          Customer Benefits
• Increased driving awareness
• Multiple hazard alerts
• Simplified solo parallel parking
• A third eye on a road with increasing
  distractions
• Ability to locate nearest hazard relative to
  automobile
• Reduction in parking lot fender-benders
         Desired Specifications


•   Minimum reliable distance: 1/3 foot
•   Maximum distance: 6 feet
•   Resolution within 5% within 1 foot
•   Avg. Percent Error less than 10%
            Original Design
• Utilize HC12 Microcontroller
• Minimal hardware
• Filter and Amplify received signal
                Revisions
• HC12         Labview
• Analog        Digital
• Timing ultrasonic wave reflection
• Transmitter signal generation
• Introduction of tone detector
               Block Diagram
TRANSMITTER   PULSE GENERATOR              AUDIO OUTPUT




                            COUNTER/
                          SHIFT REGISTER      LABVIEW




                  TONE DETECTOR
                                           VISUAL DISPLAY

               FILTER/
 RECEIVER     AMPLIFIER
Hardware Layout
   Schematic Part 1:
Signal generation and timing
Transmission Pulse
Received Signal




Approx. distance of object: 1/2 foot
Schematic Part 2:
 Signal Acquisition
Filtered/Amplified Signal




      Approx. distance of object: 2 feet
Tone Detector Output
Display: All Clear
Display: Collision Imminent
         Tolerance Analysis
• 1) Sensor choice
• 2) Range tests:
  • Metal: 4.2 ft. avg.
  • Plastic: 4.0 ft. avg.
  • People: 1.5-2.0 ft. avg.
• Average percent error: 2.8 %
                 Results
• Powered by single 12V supply
• User friendly
   • Adjustable control settings
• Includes multiple alert mechanisms
   • Distance display
   • Hazard location display
   • Audio alert
                 Difficulties
• Sensor limitations
   • Range: 1/3 foot to 6 feet
• Input voltage
   • 20V sensor limit vs. 12V vehicle battery
• Sensor interference
   • Directivity
   • Encase sensors
          Future Modifications

• Convert Labview code to portable controller unit
• Better sensors
• Integrate up to 4 sensors
      Acknowledgements


• Jon Wheeler
• Parts Shop
Questions?

								
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