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Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1
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Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Dec 24, 2015

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Eileen Boone
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Page 1: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Occupant Classification System for Automotive Airbag

Suppression

A.Jaffer Sharief

EEL 6935

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Page 2: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Agenda• Introduction to Airbag Systems• Classification and Detection Challenges.• Occupant Classification in an Embedded System.• Design considerations.• Occupant Classification System in Action.• Conclusion

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Page 3: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

What is Airbags system ?

·Airbags Control System is a

passive restraint system which

determines crashes and deploys

Airbags, thus preventing loss of

human life in crash situations.

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Page 4: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Working of Airbags

There are three parts to an airbag system :

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·The Airbag, made of a thin, nylon fabric,

which is folded into the steering wheel.

·The Sensor, the device that tells the bag to inflate.

·A rapid pulse of Nitrogen Gas, which is used to inflate the airbag.

Page 5: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Why is Classification needed?

·Between 1987 and 2000, 6553 lives were saved by the airbags in US alone.

But …– 85 children and 19 infants in Rear Facing Infant Seats

(RFIS).– NHTSA mandates automatic airbag suppression when

child or RFIS present.

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Source: National Highway Transportation and Safety Administration (NHTSA)

Page 6: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

RFIS during airbag deployment:

RFIS before deployment RFIS after deployment

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Page 7: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

7Source: New generation BMW child seat and Occupant Detection Systems

Approach 1: Weight Sensing

Seat Mat Weight Pattern

Page 8: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Approach 2: Computer Vision

Classes of Occupancy Empty RFIS or Child Adult

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Page 9: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

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Challenges for Computer VisionInter-Class Variability

Page 10: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

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Challenges for Computer Vision

Inter-Class Variability

• Light Levels ( day to night)

• Seating Positions • Shadows and bright spots in

same image due to motion.

Page 11: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Challenges for Computer Vision

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Intra-Class Variability

RFIS RFIS under blanket

Page 12: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

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Challenges for Computer Vision

Two different classes showing about the same

pattern

Inter-Class Similarity:

Page 13: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

System Requirements

13Source: BOSCH Automotive

• Real-Time Operation

• Very Reliable

• Compact

• Low Power

Page 14: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

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Architecture of the Occupant Classification System

ASIC

Single Grey Scale

Camera

Sensors Electronic Control Unit (ECU) Actuators

Front Airbag

Side Airbag

BeltPretensioner

Curtain AirbagsFLICmCDSP

CAN• Low Cost

• High Reliability

I2C• Efficient

• High Performance

Page 15: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

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System Design

Page 16: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

System Algorithm in Action

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• Edge Detection Algorithm

• Eclipse Fit

• Feature Extraction

• Dynamic Tracking

• Accurate Prediction

Page 17: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Conclusion

• High Accuracy in detection and classification.

• Can be scaled for new features such as face recognition and drowsiness alert systems.

• Achieves quick time to market.• Very Robust and Real-time classification.

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Page 18: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Questions ?

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Page 19: Occupant Classification System for Automotive Airbag Suppression A.Jaffer Sharief EEL 6935 1.

Thank you!

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