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Airbags
1
By KARTHIK RAMPA
13/ME/134
What are Airbags?
 Supplementary Restraint System for driver and/or passenger
safety in case of a crash.
 Basic Mechanism: A thin nylon bag in the steering wheel / above
glove compartment inflates in the event of an impact and
prevents the driver/passenger from hitting the steering
wheel/dashboard.
 3 Main Components: 1) Airbag module
2) Diagnostic Unit
3) Crash sensors
2
Airbag Module
 Contains both inflator unit and light-weight fabric airbag and is
located either inside: 1) Steering wheel hub 2) Above glove
compartment 3)Near side compartment (as
separate/combined head/side/window-curtain airbag)
 Airbag: Thin nylon fabric bag folded neatly into steering wheel
that inflates to the size of a large beach ball on impact.
 Inflator unit: Contains a number of sodium azide pellets which
are electrically ignited to produce N2 that then fills the airbag.
This is preferred to storing compressed gas in the unit (space,
durability)
 Both airbag and inflator unit are for single deployment only – i.e
have to be replaced after a crash
3
Diagnostic Unit
 Enables inflator unit and sensors when vehicle is turned on,
performs self check.
 Constantly monitors airbag readiness and indicates
malfunctioning through an indicator on dashboard
 Usually stores electricity to activate airbag in the event that a
crash damages the battery / link to battery
Sensors
• Several crash sensors located in the front of vehicle and in the
passenger compartment
• Each senses the sudden deceleration or impact in the event of a
crash and flips a mechanical switch to indicate a crash.
4
5
Electromechanical Crash Sensors
Airbag Deployment
 Frontal crash scenario: Car crashes into an
obstacle (wall) at 20+ mph
 Sensors detect the deceleration and inflator
unit is activated
 Deployment sensitivity: To guard against
accidental inflation on hard braking, sensors
detect collisions into a solid barrier at speeds greater than 8-14
mph only as impacts
 An electric current is used to heat a filament wire that ignites the
NaN3 capsules, producing N2:
2NaN3  2Na + 3N2
10Na + 2KNO3 K2O + 5Na2O+ N2
K2O + Na2O SiO2 alkaline glass (safe, unignitable)
130 g of NaN3 produces 67 ltrs of Na
6
Airbag Deployment
 The airbag then inflates fully at speeds > 320mph within 0.05s of
crash. For maximum safety, occupant must have seat belt on and
sit with chest 10” from steering wheel
 Immediately after full inflation, the airbag deflates through tiny
pores on the surface within 0.3s
7
MODERN TYPES OF AIR BAGS
Curtain Air Bags
• Developed by Mercedes and Volvo.
• Inflate in front of windows to provide passengers better head
and neck protection.
• More efficient at tipping and side impacts .
• Reduce HIC by 80% .
8
HEAD THORAX BAG
• Developed by ford and Renault .
• High protection to head .
9
Inflatable Tubular Structure (ITS)
• Developed by BMW .
• The world’s first airbag for head protection .
10
AIR BAGS CHECKS
• When we turn the key, look at the dash to find airbag or SRS
light for 7-10 seconds and then go out.
Problem occurs when
• If the light does not come on .
• If the light does not go off after period .
• If the Light comes on while driving .
11
CONCLUSION
• Air bags are of greater importance in today’s vehicles
since safety of human life is of prior importance.
• So far safe riding and for saving the precious life the safety
bags must be implemented.
• Let’s hope every automobile manufacturer implement the
same.
12

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Airbags

  • 2. What are Airbags?  Supplementary Restraint System for driver and/or passenger safety in case of a crash.  Basic Mechanism: A thin nylon bag in the steering wheel / above glove compartment inflates in the event of an impact and prevents the driver/passenger from hitting the steering wheel/dashboard.  3 Main Components: 1) Airbag module 2) Diagnostic Unit 3) Crash sensors 2
  • 3. Airbag Module  Contains both inflator unit and light-weight fabric airbag and is located either inside: 1) Steering wheel hub 2) Above glove compartment 3)Near side compartment (as separate/combined head/side/window-curtain airbag)  Airbag: Thin nylon fabric bag folded neatly into steering wheel that inflates to the size of a large beach ball on impact.  Inflator unit: Contains a number of sodium azide pellets which are electrically ignited to produce N2 that then fills the airbag. This is preferred to storing compressed gas in the unit (space, durability)  Both airbag and inflator unit are for single deployment only – i.e have to be replaced after a crash 3
  • 4. Diagnostic Unit  Enables inflator unit and sensors when vehicle is turned on, performs self check.  Constantly monitors airbag readiness and indicates malfunctioning through an indicator on dashboard  Usually stores electricity to activate airbag in the event that a crash damages the battery / link to battery Sensors • Several crash sensors located in the front of vehicle and in the passenger compartment • Each senses the sudden deceleration or impact in the event of a crash and flips a mechanical switch to indicate a crash. 4
  • 6. Airbag Deployment  Frontal crash scenario: Car crashes into an obstacle (wall) at 20+ mph  Sensors detect the deceleration and inflator unit is activated  Deployment sensitivity: To guard against accidental inflation on hard braking, sensors detect collisions into a solid barrier at speeds greater than 8-14 mph only as impacts  An electric current is used to heat a filament wire that ignites the NaN3 capsules, producing N2: 2NaN3  2Na + 3N2 10Na + 2KNO3 K2O + 5Na2O+ N2 K2O + Na2O SiO2 alkaline glass (safe, unignitable) 130 g of NaN3 produces 67 ltrs of Na 6
  • 7. Airbag Deployment  The airbag then inflates fully at speeds > 320mph within 0.05s of crash. For maximum safety, occupant must have seat belt on and sit with chest 10” from steering wheel  Immediately after full inflation, the airbag deflates through tiny pores on the surface within 0.3s 7
  • 8. MODERN TYPES OF AIR BAGS Curtain Air Bags • Developed by Mercedes and Volvo. • Inflate in front of windows to provide passengers better head and neck protection. • More efficient at tipping and side impacts . • Reduce HIC by 80% . 8
  • 9. HEAD THORAX BAG • Developed by ford and Renault . • High protection to head . 9
  • 10. Inflatable Tubular Structure (ITS) • Developed by BMW . • The world’s first airbag for head protection . 10
  • 11. AIR BAGS CHECKS • When we turn the key, look at the dash to find airbag or SRS light for 7-10 seconds and then go out. Problem occurs when • If the light does not come on . • If the light does not go off after period . • If the Light comes on while driving . 11
  • 12. CONCLUSION • Air bags are of greater importance in today’s vehicles since safety of human life is of prior importance. • So far safe riding and for saving the precious life the safety bags must be implemented. • Let’s hope every automobile manufacturer implement the same. 12