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There are airbags at the front of the dashboard in most cars, and many vehicles have airbags along the side of the car as well.
An airbag must inflate downlaod in order to be fully inflated by the time the forward-traveling occupant reaches its outer surface. Airbags are stretchable fabrics or other materials that are tightly packed in various locations throughout your vehicle.
But how exactly do they work? The bag itself and its inflation mechanism is concealed within the steering wheel boss for the driveror the dashboard for the front passengerbehind plastic flaps or doors which are designed to “tear open” under airbag control unit pdf download force of the bag inflating.
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If an airbag deploys too late or too slowly, the risk of occupant injury from contact with the inflating airbag may increase. More From Krishna Kumar. Once the requisite ‘threshold’ has been reached or exceeded, the airbag control unit will trigger the ignition of a gas generator propellant to rapidly inflate a fabric bag.
The first reaction is the decomposition of NaN3 under high temperature conditions using an electric pef. The second reaction shows just that. These bags are compressed and airbag control unit pdf download in a small area. Each restraint device is typically activated with one or more pyrotechnic devices, commonly called an initiator or electric match.
Airbag Control Unit Diagram
The final reaction is used to eliminate the Doanload O and Na2O produced in the previous reactions because airbag control unit pdf download first-period metal oxides are highly reactive.
While this does not necessarily prevent total injury or death, it can be very helpful in cushioning the passengers in a car in many cases.
It is very important that the materials used in this reaction are not hygroscopic because absorbed moisture can de-sensitize the system and cause the reaction to fail.
Remove them from Saved? When there is an accident, the airbags fill up with air very quickly to provide a cushioning system for the people in the car so that they are not thrown around in the event of a crash. The re actions, in order, are as follows. A typical driver-side airbag contains approximately g of NaN3, with the larger passenger-side airbag containing about g. Within about 40 milliseconds of impact, airbag control unit pdf download these components react in airbag control unit pdf download separate reactions that produce nitrogen gas.
As the vehicle occupant collides with and squeezes the bag, the gas escapes in a controlled manner through small vent holes. The signals from the various sensors are fed into the Airbag control unit, which determines from them the angle of impact, the severity, or force of the crash, along with other variables.
Are you sure you want to delete this list? In a seat belt pre-tensioner, this hot gas is used to drive a piston that pulls the slack out of the seat belt. Also remove everything in this list from your library.
Close Dialog Are you sure? In an airbag, the initiator is used to ignite solid aibag inside the airbag inflator. When the conductor becomes hot enough, it ignites the combustible material, which initiates the gas generator. Airbag deployment has saved thousands of lives through the years. The electric match, which consists of airbag control unit pdf download electrical conductor wrapped in a combustible material, activates with a current pulse between 1 to 3 amperes in less than 2 milliseconds.
The design is conceptually airbag control unit pdf download a central Airbag control unit ACU a specific type of ECU monitors a number of related sensors within the vehicle, including accelerometers, impact sensors, side door pressure sensors, wheel speed sensors, gyroscopes, brake pressure sensors, and seat occupancy sensors.
Proper airbag deployment can ensure that you and your passengers survive a crash that you may have otherwise experienced serious injury wirbag death as a result of. The airbag’s volume and the size ldf the vents in the bag are tailored to each vehicle type, to spread out the deceleration of and thus force experienced by the occupant over time and over the occupant’s body, compared to a seat belt alone. The airbag system is extremely complex and needs to activate within milliseconds after a crash occurs to ensure the protection of the driver and passengers.
Typically, the decision to airbag control unit pdf download an airbag in a frontal crash is made within 15 to 30 milliseconds after the onset of the crash, and both the driver and passenger airbags are fully inflated within approximately milliseconds after the first moment of vehicle contact. Sign up to vote on this title.
The burning propellant generates inert gas which rapidly inflates the airbag in approximately 20 to 30 milliseconds. These products react with SiO2 to produce a silicate glass which is a harmless and stable compound. Documents Similar To air bags.