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Old 06-03-2008, 06:10 PM
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Airbags

Well, I just wrote a complete paper on the Airbag System of a vehicle. If anyone would like to read it, see it, learn more about the system, just let me know and I can send it to you. It also has a brief, and vague, description of what to do in case of airbag deployment, how to fix an airbag system and the sort. Also - Honda makes an appearance at the end!!!

Rhys
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Old 06-03-2008, 06:12 PM
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Can't you paste it?
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Old 06-03-2008, 06:18 PM
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Quote:
Originally Posted by Prelude13 View Post
Can't you paste it?
I could paste it... it would be extremely long, but i guess so..lol. I'll just make it single spaced instead of the required double spaced, should make it shorter.

Here ya go:

Rhys Bussiere
06/04/08

Airbag Report

Airbags were invented in 1952 by a man named John W. Hetrick from Newport, Pennsylvania for the intended purpose of protecting his own family from harm. Later, a man named Allen K. Breed would invent the “Ball-in-Tube” sensor for vehicles, which made the airbag go off when there was a crash sensed by the ball-in-tube sensor. The earliest airbag systems were bulky and large, and were usually made up of compressed or heated air, Freon, compressed nitrogen gas (N2), a mixture of water and potassium (KH2O), or carbon dioxide (CO2). The airbag was then forgotten for many years because of lack of interest, but then in 1980 Mercedes brought it back by including it into their top end models. The system introduced in these vehicles would tighten the seat belts and then deploy the airbags, making it an added bonus safety feature to go along with the seat belts. From there, the airbag system caught on, and on July 11th, 1984 all cars built after April 1st, 1989 were required to have an airbag system along with the automatic seatbelt system.

Here are the components that make up the airbag system, what their purposes are and how the system works. The basic components consist of a module that contains an airbag and an inflator or gas generator, crash sensor(s), an indicator lamp, a diagnostic monitoring unit and a steering wheel connecting coil. All of these components are connected by a wiring harness that is connected to the battery of the vehicle. The system works like this: In a frontal collision at roughly 9 mph, the crash sensors will sense that there is a sudden deceleration and send a signal to an igniter, or initiator. This igniter has a thin wire that will heat up and go into the propellant chamber, which causes a solid chemical propellant sealed inside the chamber to take on an extremely rapid chemical reaction. This reaction produces Nitrogen gas to fill the nylon woven airbag. These nylon woven airbags are fitted into a container that proves as the middle of the steering wheel on the driver’s side, and is in the dash above the glove compartment on the passenger side. The crash sensors are also there to make sure that the airbag system will not go off when only going over a pot hole or speed bump. Airbag systems can also hold a reserve charge even after the ignition has been shut off and/or the battery disconnected. All vehicles are different, which means the charge can be gone in 1 second or can last upwards of 10 minutes!! Since the components within the system are extremely important the vehicle does a self test on all of the components when the vehicle is started up, which is why your airbag system light on the gauge cluster flashes briefly when you turn on your car.

To test and verify that an airbag system is working properly here is a sample of the procedure to follow:
1. Install a scan tool or jumper wire so you can read all of the old and new codes
2. Turn on the ignition switch
3. Watch the airbag indicator might on the dash and make sure it is flashing like it supposed to
4. If the dash lamp is showing a problem, read the manufacturers diagnostic method and use the chart to figure out what the code means from a chart in the proper service manual
5. Make all the repairs that are called for and then repeat steps 1-4 to make sure everything is working again
6. Clear all the stored codes, once again following the manufacturers specifications
7. Disarm the system, following manufacturers procedures
8. Remove the airbag load tool or simulator, whichever one is installed, if any at all
9. Re-install the airbag module
10. Re-activate the system according to manufacturers specifications
11. Watch the airbag indicator lamp on the gauge cluster to make sure that the light goes out after start up

If the vehicles airbag has been deployed, you should put tape over the vents of the airbag to keep the dust contained. Then, turn on a vacuum and open the vents at low speeds, to get the dust out and immediately sucked up by the vacuum. Then, vacuum the interior of the car, to get rid of all the dust in there. Take out the deployed airbags and place them in a plastic bag and dispose of them. If the vehicles airbags are NOT deployed, then you should follow this procedure:
1. Disarm the airbag system and wait the specified time as stated from the manufacturer, using an airbag module simulator or load tool if called for
2. Perform whatever repairs are necessary and then make sure the sensor mounting locations are placed back properly
3. Visually inspect the airbag system for damage
4. Replace damaged parts if called for, and replace using specified instructions and parts from manufacturer. If an airbag that has not deployed has to be replaced, then it must be deployed following the manufacturers specifications
5. Turn the system back on and check to make sure system is operating properly

Some manufacturers do NOT recommend making any wire repairs to the airbag system, but if they do make sure to follow the procedures very carefully. If the vehicles external sensors are to be replaced make sure that they are mounted in the exact spot they were before. Make sure they are properly positioned with the sensor arrows facing forwards and the fasteners are torqued down to the proper specification as stated by the manufacturer. This being said, repairs are usually limited to the wiring harnesses of the airbag systems. It is usually not wise to make repairs to the airbag system parts unless it is recommended by the manufacturer.

Airbag systems are becoming more and more advanced, and the future is looking very good for this system. On September 5th, 2005, Honda announced that it had created the very first airbag system for a motorcycle. The system contains the same components as it would for a vehicle, and even operates the same. The only difference is that the 4 crash sensors are located on the front fork of the motorcycle. When these sensors detect a crash, they send the data to an ECU which calculates the deceleration of the crash and determines whether or not it is necessary to inflate the airbag. After doing much testing of the system, Honda has taken the opportunity to also advance the airbag systems of their vehicles, and adapt some of the technology from the motorcycle airbag system into their cars and trucks.
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Old 06-03-2008, 06:36 PM
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Nice read, thank you!
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Old 06-03-2008, 08:29 PM
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i give you an A+.
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Old 06-03-2008, 08:48 PM
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i give you an A+.
Let's hope my instructor feels the same way!! lol
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Old 06-03-2008, 11:03 PM
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That's a good read mate
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Old 06-03-2008, 11:55 PM
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im interested in how the air bag for motorcycles will work and be beneficial to saving a life
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Old 06-04-2008, 08:37 AM
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here is the site where I found the airbag for the motorcycle:

http://world.honda.com/news/2005/2050908.html

but I agree with you, I would think it would just shoot the driver off the back of the bike from the impact... lol. Not really much help...
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Old 06-04-2008, 06:13 PM
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Great job! I had to give an informative speech two weeks ago and this would have made a great subject
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