blind spot control system (blis)

7/31/2019 Blind Spot Control System (BLIS)

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Blind-Spot CollisionWarning System

Arslan Zulfiqar Talip Ucar


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Why Blind-Spot Warning System

Vehicle accidents cause annually 1:40,000 deaths3.5 million injuries

More than 800,000 vehicles in lane-change blind-spot collisions annually 2.


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Objective

Monitor blind-spot for vehicles.Detect vehicles in blind-spot.

Display distance of vehicles in blind-spot.Sound warning on turn-signal, if objectpresent.


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Schematic


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Start Program

Send Trigger

Echo Pulse Goes High(start timer)

Echo pulse Goes Low(stop timer)

Read Timer

Calculate Distance

Display on LCDBeep

Distance < 3m

AndTurn Signal on

Dont Beep Distance >3m

Or Turn Signal off


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Sensor Module

Distance (cm) = t us / 1000000 us/s * (347m/s) * (100 cm/m) / 2


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Sensor Module

Distance Range vs Degree

0

50

100

150

200

250

300

350

0 10 20 30 40

Degree

D i s t a n c e

R a n g e

Distance Range


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Sensor Module

Range: 10-300 cmVoltage: 5vCurrent: 30 mA typ. 50 mA Max.Frequency of sonic bursts: 40 KHz


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LCD module


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Module Testing


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Module TestingObject placed at (observed with ruler): 30 cm

Calculated distance (from waveform)= (1800 /1000000)*(347)*(100/2)= 31.23cm

Object placed at (observed on LCD): 34 cm


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Module TestingPulse width changes with distance


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Module Testing

Distance(ruler)

Distance(LCD)

Pulse width(us)

Distance(calculated

from scope)

10 14 520 9.022

20 24 1100 19.085

30 34 1800 31.23

40 44 2400 41.64


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Module TestingError on LCD

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0 10 20 30 40 50

Distance (cm)

E r r o r

( p e r c e n

t a g e

)

Series1


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Module TestingError on the Scope

0

0.02

0.04

0.06

0.08

0.1

0.12

0 10 20 30 40 50

Distance (cm)

E r r o r

( p e r c e n

t a g e

)

Series1


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Successes

Detects presence of objects.Measures distance of objects.Displays distance on LCD, if object ispresent else displays that there is noobject.Gives sound warning if object present inthe range and turn-signal high.


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Failures and ModificationsCannot detect if sensor is blockedbecause sensor doesnt behave well atvery close range i.e., < 6cm.

Sensor is poled periodically instead of when turn signal is high as originally

proposed.


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Challenges

Learning PICS programming.Interfacing PICS with a serial LCD throughthe RS232 serial output.Controlling when to sound the warning.Keeping cool when the sensor burnt outone week before the demo!


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Recommendations

Have the ability to change units of distancebeing displayed on LCD.

Have the ability to increase volume of thewarning as the object distance decreases whenturn signal is high.Have the ability to switch off sound warning bythe user.Have the ability to change the distance range


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References

[1]:http://www.rvtechstop.com/articles/vorad1_s.pdf

[2]:http://www.sae.org/automag/features/futurelook/03-2005/1-113-3-108.pdf


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Questions ?

Special thanks to Prof. Carney and Chirantan Mukhopadhyay

blind spot control system (blis)

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