Transcript Adaptive Headlight System - Rochester Institute of Technology

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
Project Objectives
• To ENHANCE the existing functionality
• Improve VISIBILITY
• Decrease number of night time accidents
• Increase SAFETY for drivers & pedestrians
First Feature
• Adaptive Headlights:
– BMW animation
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
• Speed Controlled Beam Orientation:
– Narrow & lengthen the beam at HIGH speeds
– Widen & shorten the beam at LOW speeds
• How?
Secondary Reflector
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 & Specifications
• Vishay Spectrol Smart Position Sensor
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
• Darlington
• Cricket
SW 1
9V
D1
R1
BZ 1
VR 1
R2
R3
TIP 121
0V
SW1 = Toggle switch
R1 = LDR
R2 = 10k ohm
R3 = 1k ohm
VR1 = 10k ohm
BZ1 = Buzzer
D1 = Diode (1N4001)
Transistor = (TIP 121)
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
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
Week 2
Begin HC12 Simulations
Week 2 (9.17.03)
Acquire Test data
Week 2 (9.18.03)
Week 3
Experiment with servo/mechanical method to move reflectors
or find better method
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.
9.15.03 (begun)
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 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
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)
Smart Position Sensor (Vishay Spectrol)
$10 setup
sample
Steering wheel and column (junk yard)
~ $300 /each
$20
Mirrors (2 long ; 2 short)
$15 /all
Light Bulbs (4)
$30
Headlight encasings (junkyard)
$20
Light Meter for tabulating data & testing
RIT
2x4 wood beams for mounting
External Lighting for testing & demo
$70
$10
PreOwned
$15
Batteries (flashlights, etc)
$10
Misc (screws, wire, solder, R, C, etc)
$30