![]() SAT - Satellite sensors, which are basically various types of sensors that are placed in various sections of the car depending on the number of airbagsġ.Satellite sensors can be electromechanical or MEMS based sensors which provide signals to the ACUĢ.The ACU then combines these signals along with signals from its in built sensors and based on certain thresholds, decides to deploy airbag.ģ.Rollover sensors, Weight sensors provide inputs to the ACU to decide what airbags needs to be deployed.Here is the simplest representation of a modern day SRS system Gyroscopes - are used to detect roll over and help the ACU take a decision on deployment Today its also possible to include 3 accelerometers within a chip to measure change over all 3 axesī. They are not only used to measure horizontal accelerations but can also be used to measure lateral acceleration. Accelerometers - used to measure the rate of acceleration/deceleration. The two most common applications of MEMS from an airbags control point of viewĪ. A cover that opens as the cushion inflates. The housing can be made of steel, plastic or even textile.Ĥ. A housing for storing the folded bag and the inflator. A textile cushion made of thin, woven nylon or polyester fabric, which is the actual airbagģ. The inflator basically contains the chemicals and the heating element that are required to generate the inert gas that fills up the airbagĢ. An inflator that produces sufficient gas to inflate the folded bag. ![]() The Airbag module typically consists of 4 main components: By the time the car stops, the bag should have completely deflated This makes the bag deflate as the gas it contains escapes through small holes around its edges. The driver (moving forward because of the impact) pushes against the bag. The bag is coated with a chalky substance such as talcum powder to help it unwrap smoothlyĨ. As the bag expands, it blows the plastic cover off the steering wheel and inflates in front of the driver. As the explosive burns, it generates a massive amount of harmless gas that quickly fills up the nylon airbagħ. Older airbags used sodium azide as their explosive newer ones use different chemicalsĦ. ![]() The heating element ignites a chemical explosive. The ACU passes an electric current through a heating elementĥ. If the deceleration is great enough, the sensor sends a signal to the ACUĤ. Airbag sensor detects the change of speedģ. When a car hits something, it starts to decelerate (lose speed) very rapidlyĢ. Here is the simple explanation of how the system is designed to work
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