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Brake Intensity Advisory System Final Design Assessment

Brake Intensity Advisory System Final Design Assessment. Jace Hall Michael Purvis Caleb Trotter Edward Yri ECE 4007-L01 12/05/2011. Project Details. What

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Brake Intensity Advisory System Final Design Assessment

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  1. Brake Intensity Advisory System Final Design Assessment Jace Hall Michael Purvis Caleb Trotter Edward Yri ECE 4007-L01 12/05/2011

  2. Project Details • What • BIAS (Brake Intensity Advisory System) operates by illuminating an auxiliary set of LEDS located around the perimeter of the standard brake lights when “hard braking” occurs • Cost • The cost associated with mass production of the BIAS is projected to be $66.83

  3. Project Motivation • Why • The percentage of rear-end collisions (17% of all claims) ranks second among all automobile accidents • Who • BIAS is intended for drivers and car manufacturers who are concerned with operating and manufacturing safer vehicles

  4. Proposed vs. Actual Design Goals

  5. Proposed vs. Actual Technical Objectives

  6. High Level BIAS Schematic

  7. Implemented BIAS Design

  8. BIAS Operation

  9. Testing the Force Sensing Resistor Circuitry Output Specification • 0 – 3.3 V output from the force sensing resistor circuit Testing Method • The FSR was attached to the vehicle brake pedal, and the divider circuit resistor was sized to produce the appropriate output

  10. Confirming Transition at the Hard Breaking Voltage Threshold Specification • Real time response to the determined voltage threshold value Testing Method • A volt meter measured the FSR voltage when the second LED array zone was initially illuminated. The value was 1.9 volts

  11. Software Tests Specifications • Three defined controller states corresponding to illumination parameters • Software definability Testing Method • LED output confirmed the controller states operated properly • Sensitivity was altered to ensure software definability

  12. Design Modifications • 12 V voltage regulator added to reduce 13.8 V car outlet voltage • 1.5 MΩ grounding resistor added to LED driver circuit • Common grounding network established

  13. Supporting Design Modification Figure

  14. Problems Encountered and Solutions • Problem: The LED driver circuit current limiting resistors were overloaded • Solution: New resistors were added with higher power ratings • Problem:LED brightness was not consistent • Solution: Shorted soldering points were located, and fixed

  15. Prototype Cost Analysis • Prototype Expenditures • Of the requested $405, $128.97 was spent • Many of the required parts were donated • Mass Production Cost • Reduced hardware cost based on quantities purchased • Lower microcontroller cost based on reduction of features

  16. Production Cost Break Down

  17. Marketability and Projected Profits • No automobile manufactures currently use a FSR to process braking force and illuminate brake lights accordingly • Profits from the system would come from royalty payments allotted to the patent holders * Projected installations based on ~25% of the vehicles produced by Ford Motor Company annually

  18. Improvements and Future Work • Create a printed circuit board for control and FSR circuitry • Integrate and program a lower cost microcontroller • Fabricate lenses to cover LED arrays • Test BIAS system on alternative vehicles

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