Frzautoelectrician

Operation of SRS Airbag

 Hello, welcome to automation. I'm Clinton, although supplemental restraint systems first appeared in the early 1980s, very few manufacturers chose to install them as factory equipment. The airbag is designed to complement existing seat belt restraint systems. The SRS module determines the severity of a crash using crash sensors strategically located throughout the vehicle. The module only deploys the airbags and pretensioners when 

detects an impact of sufficient force is not sufficient to ensure airbag deployment. The control module may deploy seat belts Just the two most common types of impact sensors are electrical and capacitive. One contains a piezoelectric element that distorts during an impact, producing an analogous voltage relative to -- pps: the force of gravity from the deceleration forces, this element can also sense the direction of the impact force Capacitive type 

is constructed similar to a capacitor some of the plates of the Capacitors are fixed while others are mounted on a moving seismic mass if the seismic mass moves in an accident v the value of the capacitors changes this information is processed by the evaluation electronics and sent to the SRS control unit. When the squid burns, it reacts with the igniter --pps-- Combined barium and potassium nitrate charge. This is a very fast-acting explosive compound. This explosion creates the heat needed to start the chemical reaction in the gas generator and separate the chemicals. to fire sodium azide copper oxide gas generator If you want to learn more about this topic and get full access to our extensive video library, you need an automated membership. Visit our website and get --pps-- Added in a better future with better training

How Do Airbags Actually Work?

This would happen in an exceedingly high-speed accident if there was no airbag albeit the driving force fixed their safety belt it's a giant engineering challenge to bring the figure to rest from a high speed in a time period of a hundred milliseconds while not inflicting abundant hurt to the body let's study this life-saving technology by understanding the mechanism of airbag inflation that apparently happens because of a chemical explosion seatbelts are imagined to hinder the movement of a person's body but throughout accidents such seat belts exert large force on your chest space and might cause internal organ injury to avoid this large force on the chest fashionable safety belts slightly unharness the seat belt with the assistance of a torsion bar this action makes the higher body slightly move forward however once the torsion bar is completed with the Belt release the upper body's movement is in remission here let's pause here and analyze the physics of the accident intimately please note that the seat belt arrests the motion of your upper body excluding your neck and head once solely your upper body is arrested and therefore the neck and head aren't arrested you can guess what's going to happen the pinnacle goes in a {very} excellent setup movement in a high-speed accident The devastation are often horrific even with the safety belt this is often be} why engineers came up with the thought of airbags airbags have a padding impact and at a similar time stop you from hit the dashboard the very initial plan to inflate the airbag employing a compressed gas arrangement was a failure this style had 2 main problems one the spring wasn't able to confirm the crash accurately two the compressed Air was not able to fill the airbag fast enough to stop harm from the crash for these reasons they weren't commercially used the founding father of joyson safety systems man allen k breed came up with some groundbreaking inventions to unravel these problems initial he improved the accuracy of the detector employing a ball and tube sensor during this sensor a steel ball is control in position with the assistance of a magnet once a collision happens the automobile decelerates terribly quickly however the ball gets separated from the magnet thanks to its inertia the ball moves forward to shut the circuit and sends a symptom to the air pump the second and his biggest contribution was the utilization of chemical explosives rather than compressed gas man breed used a chemical known as atomic number 11 chemical compound for this purpose The specialty of sodium azide is such if this solid chemical is triggered by a temperature over three hundred degrees uranologist it'd quickly and directly convert to a foamy state the fifty grams of sodium azide generated nearly seventy liters of N this chemical is stuffed within an airtight cylinder of the wheel the electrical signal sent by the ball detector passes through a pyrotechnic device it is a skinny resistant wire once this passes through it it generates a temperature of over three hundred degrees uranologist this causes the atomic number 11 chemical compound to explode and generate N gas terribly quickly this can be able to inflate the bag among thirty milliseconds these 2 breakthroughs created airbags attainable for industrial use this proprietary style of breed corporation was free by chrysler in their dodge daytona model automobiles in 1988 This was a huge success and every one alternative car makers began to implement similar airbag technologies but this design has two major drawbacks initial the gas produced once the atomic number 11 chemical compound explosion is ototoxic the sodium metal of the exhaust causes the difficulty scientists were able to neutralize this issue by adding saltpeter and silica does one bear in mind the notorious takata's sixty seven Million airbag recall incident this incident happened thanks to a notorious property of sodium azide they absorb wetness content simply if there's a outflow within the style stage or producing sodium azide can absorb moisture after the moisture absorption when triggered the chemical will bear violent explosions inflicting the rupturing of airbags and shell flying to the passengers This is exactly what happened with takata's airbags eventually the corporate went bankrupt to avoid such unfortunate incidents the addition of a sicative are going to be useful and strict internal control measures are needed for parts like airbags these days atomic number 11 chemical compound is replaced by guanidine nitrate as a gas generator it's less ototoxic than sodium azide and is a smaller amount explosive it's not sensitive to wetness currently we want not worry regarding the explosion and harmful gases even once these 2 style changes the mechanical device sensor-based airbags suffered from an added issue they'd sometimes get activated even when they fell in an exceedingly chuckhole the rationale the electrical switches don't offer info regarding the speed of slowing that is important to work out the severity of the crash meaning it cannot distinguish between a pothole and a crash this is often be} why to observe the crash additional accurately these days mems sensors are used with a sophisticated electronic management unit this is a capacitance-based methodology and {also the} severity of the crash can simply be determined eu also takes input from the wheel speed sensors gyroscopes Brake pressure sensors and seat occupancy sensors the algorithmic rule determines once to trigger the gas generator and the way abundant to inflate the airbag supported the severity of the crash the igniter ignites the explosive among 2 milliseconds and fills the bag within twenty to thirty milliseconds the airbag remains absolutely open for a hundred milliseconds currently the airbag is prepared to cushion you the airbag spreads the impact force over a bigger space it not solely inflates however additionally deflates to slow you down throughout impact whereas deflating it offers longer to travel you'll see two vent holes in airbags the air vents out from these holes and therefore the airbag deflates to bog down your body does one understand why the airbag won't add thusme automobile models if you're not carrying the safety belt The speed of airbag inflation is large around 320 kilometers per hour throughout this inflation if you hit the airbag that may be additional deadly so remember to wear your seatbelt so this lovely airbag technology will work before you permit don't forget to be a member of the lessex team see you next time many thanks