Airbag Ppt
Description: Several crash sensors located in the front of vehicle and in the passenger compartment... Frontal crash scenario: Car crashes into an... – PowerPoint PPT presentation Number of Views: 8695 Avg rating: 3. 0/5. 0 Slides: 13 Learn more at: Category: less Transcript and Presenter's Notes Title: Airbags 1 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 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.
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1980:first commercial airbags appeared in automobiles. Ever since 1988 it became a binding. Efforts to adapt the airbag was stranded due to prohibitive prices and technical hurdles. MAIN PARTS OF AN AIRBAG Bag Sensor Inflation system BAGS Is made up of a thin nylon fabric, which is folded into the steering wheel or dashboard or the seat or door. The powdery substance released ( regular cornstarch or talcum powder) is used to keep the bags lubricated while theyre in storage. SENSOR A device that tells the bag to inflate. It works with the control module to discriminate between crash and non- crash events. INFLATION SYSTEMNaN3+KNO3=large amts. of NITROGEN GAS. Hot Blasts of the nitrogen inflate the air bag from its storage site up to 322Kmph. CONSTRUCTION OF AIR BAGS Airbag are assemblies consisting of the airbag (made of Nylon), inflator modules and sensor housing, electrical connectors (Clock spring), airbag retainer and the cover. Inflator assembly Control module activates airbag assembly- electric current is sent to the detonator-ignition of sodium azide pallets-evolves nitrogen gas.
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Airbag pdf
The seat belts provide adequate protection; the belt tensioners restrain the car's occupants in their seats. The belt force limiter reduces the risk of the belt causing injury. In this case, the airbags are not triggered. 8 9 The effect of the restraint systems during serious accidents During serious accidents, the car body absorbs the impact energy. The passenger compartment remains by and large intact and the airbags are triggered. In addition to the protection afforded by the seat belts, the restraint systems protect the front passengers from more serious injuries in the upper body and head areas. The car's central locking system is opened. 10 11 5 Airbag Components 1. Contact Reel (Rotary coupling/clock spring) 2. Air Bag Module Connector 3. Steering wheel securing bolt (use once only) 4. Steering Column 5. Harness 5 12 Airbag Control Unit Mounted directly to centre of vehicle floor Contains crash sensor, microprocessor, back up power supply and a memory unit. 13 Airbag Control Unit Airbag ECU's usually house the following:- Centre sensor.
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Includes weight sensors. Determine type of occupant in the seat. i. e child or adult. Detect the distance of passenger from airbags. 11. MODERN TYPES OF AIRBAGS Side air bag Cars that currently offer side airbags represent the new wave of occupant protection. Provides protection during side collisons. This prevents the airbag on the undamaged side of the car from inflating. 12. Curtain airbags Inflates in front of windows to provide passengers better head and neck protection. More efficient at tipping and side impacts. Door air bag The door has more space, allowing for a bigger bag that provides more coverage. Developed by Ford and Renault. Door-mounted side air bags must begin deploying in mere 5 or 6 milliseconds! 13. Airbag checks Turn the key and look at the dashboard to find the airbag light on for 7-10 sec. & then it goes off. Problems occur when • 1. Light does not come on. • 2. If light does not go off after the period. • 3. If light comes while driving. 14. CONCLUSIONS Since safety of human life is of high priority, Air bags are of greater importance in the present vehicles.
