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Adaptive Headlight System Betzayda Rivera Projects II Design Review Tuesday, 9-16-03 Background Currently, Headlights shine directly in front of a vehicle The high to low beam transition is manual In general, the same beam shines all the time just at different intensities

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adaptive headlight system

Adaptive Headlight System

Betzayda Rivera

Projects II Design Review

Tuesday, 9-16-03

background
Background
  • Currently,
    • Headlights shine directly in front of a vehicle
    • The high to low beam transition is manual
    • In general, the same beam shines all the time just at different intensities
project objectives
Project Objectives
  • To ENHANCE the existing functionality
  • Improve VISIBILITY
  • Decrease number of night time accidents
  • Increase SAFETY for drivers & pedestrians
first feature
First Feature
  • Adaptive Headlights:
    • BMW animation
second feature
Second Feature
  • High to Low beam transition:
    • High => Low with oncoming traffic or city environment
    • Low => High after lighted situation passes
  • How? Light/Dark Sensor
third enhancement
Third Enhancement
  • Speed Controlled Beam Orientation:
    • Narrow & lengthen the beam at HIGH speeds
    • Widen & shorten the beam at LOW speeds
  • How? Secondary Reflector
analysis specifications
Analysis & Specifications
  • Vishay Spectrol
    • Full 360 degree Smart Position Sensor
  • Light Sensor
    • Two methods under experimentation
      • Darlington Light Sensor
      • Cricket Light Sensor
  • Four Servo Motors
    • Two to control large reflective plate
    • Two to control smaller outer reflector
analysis specifications8

Electrical Component

Supply Voltage

4.5 to 5.5 VDC

Supply Current

20 mA max

Resolution

min of 0.5 degrees

Electrical Track

360 degrees continuous

Analog Vout

> 90% of supply

Output Impedence

1 ohm typically

Mechanical Component

Rotation

360 degrees continuous

Rotational Speed

5 max revs/sec for 60sec

Max Torque

3.68 (0.5) mNm (oz in)

Weight

30 gm

Environmental Component

Operating Life

5,000,000 Cycles

Analysis & Specifications
  • Vishay Spectrol Smart Position Sensor
analysis specifications9
Darlington

Cricket

Analysis & Specifications

SW1 = Toggle switch

R1 = LDR

R2 = 10k ohm

R3 = 1k ohm

VR1 = 10k ohm

BZ1 = Buzzer

D1 = Diode (1N4001)

Transistor = (TIP 121)

analysis specifications10
Analysis & Specifications
  • Two Large Inner Reflective Plates
    • Used to aim the headlight during turns
    • Servo positioned in center; weight distribution
    • 45 degree total mobility
  • Two Small Outer Reflective Plates
    • Used to narrow or widen beam by speed
    • Servo positioned in center; weight distribution
    • 30 degree total mobility
power consumption
Power Consumption

Relatively Low Power Stationary System; therefore Utilize Wall Power.

timeline

Scheduled Work

Task

Actual Completion Date

Week 1

Final Proposal Due (R 9.11.03 10a)

9.10.03

Week 1

Investigate and Select Sensors & Actuators

9.15.03

Week 1

Prepare HC12 for program simulation with lamp/switch board

Week 1/2

Begin Website Creation

9.12.03

Week 2

Design Review Presentation (T 9.16.03 10a)

9.16.03

After Design Review

Week 2 (9.16.03)

Finalize Component List and Methods; Update Proposal

Week 2 (9.20.03)

Acquire Components

9.15.03 (begun)

Week 2

Begin HC12 Simulations

Week 2 (9.17.03)

Acquire Test data

Week 2 (9.18.03)

Experiment with servo/mechanical method to move reflectors or find better method

Week 3

Experiment with sensors

Week 3

Build encasing and headlight setups; Test separate from HC12

Week 4

Interface tested physical components to HC12

Week 5

Connect all components together & test full sys. Demo Prep.

Week 6

Prepare what is left of Write Up & Demo.

Timeline
test plan
Test Plan
  • Test Data
    • Steering wheel rotation vs headlight movement
    • Light/Dark standards and cutoffs
  • Vishay Spectoral Rotational Position Sensor
    • Test alone
    • Test with servos and HC12 for position analysis
    • Test with servos and load to calibrate
test plan14
Test Plan
  • Sensors
    • Darlington Light sensor circuit is equip with a buzzer for independent testing
    • Cricket Light sensor setup designed light an LED when active then HC12 beep during demo for audio indication
  • Servos
    • Expansion from Projects I; test with load for available torque and repeatability
safety concerns
Safety Concerns

Purpose is to ENHANCE the safety of all!!

total expected system cost 736

Component

Priced Paid

Expected Price

HC12 MicroController

RIT

$150

Servo Motors (2)

$30

$15 /each

Servo Motors (2)

RIT

$8 /each

Light Sensor (Darlington)

$10 setup

Cricket Light Sensor (CDS Photocell, heat shrink,

3 position connector)

$10 setup

Smart Position Sensor (Vishay Spectrol)

sample

~ $300 /each

Steering wheel and column (junk yard)

$20

Mirrors (2 long ; 2 short)

$15 /all

Light Bulbs (4)

$30

Headlight encasings (junkyard)

$20

Light Meter for tabulating data & testing

RIT

$70

2x4 wood beams for mounting

$10

External Lighting for testing & demo

PreOwned

$15

Batteries (flashlights, etc)

$10

Misc (screws, wire, solder, R, C, etc)

$30

Total Expected System Cost ($736)