Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 126 views

    Airbag Sensor: Klim Valeyev, Hesam Akbarnejad, and Marco Tundo

    Uploaded by

    Sungkur Nishan
    The document describes the process of airbag deployment in vehicles. It discusses how: 1. Airbags are inflated by gas produced in a chemical reaction triggered by an Airbag Control Unit (ACU) within 20-30 milliseconds. 2. The ACU receives input from various sensors around the vehicle like accelerometers and impact sensors within milliseconds of a collision to determine whether to deploy the airbags. 3. If deployment is determined, the ACU signals the airbags to inflate through a chemical reaction, protecting passengers in a crash.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd

    Airbag Sensor: Klim Valeyev, Hesam Akbarnejad, and Marco Tundo

    Uploaded by

    Sungkur Nishan
    126 views6 pages
    The document describes the process of airbag deployment in vehicles. It discusses how: 1. Airbags are inflated by gas produced in a chemical reaction triggered by an Airbag Control Unit (ACU) within 20-30 milliseconds. 2. The ACU receives input from various sensors around the vehicle like accelerometers and impact sensors within milliseconds of a collision to determine whether to deploy the airbags. 3. If deployment is determined, the ACU signals the airbags to inflate through a chemical reaction, protecting passengers in a crash.

    Original Description:

    Original Title

    Airbag Sensor

    Copyright

    © Attribution Non-Commercial (BY-NC)

    Available Formats

    DOCX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document describes the process of airbag deployment in vehicles. It discusses how: 1. Airbags are inflated by gas produced in a chemical reaction triggered by an Airbag Control Unit (ACU) within 20-30 milliseconds. 2. The ACU receives input from various sensors around the vehicle like accelerometers and impact sensors within milliseconds of a collision to determine whether to deploy the airbags. 3. If deployment is determined, the ACU signals the airbags to inflate through a chemical reaction, protecting passengers in a crash.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    126 views6 pages

    Airbag Sensor: Klim Valeyev, Hesam Akbarnejad, and Marco Tundo

    Uploaded by

    Sungkur Nishan
    The document describes the process of airbag deployment in vehicles. It discusses how: 1. Airbags are inflated by gas produced in a chemical reaction triggered by an Airbag Control Unit (ACU) within 20-30 milliseconds. 2. The ACU receives input from various sensors around the vehicle like accelerometers and impact sensors within milliseconds of a collision to determine whether to deploy the airbags. 3. If deployment is determined, the ACU signals the airbags to inflate through a chemical reaction, protecting passengers in a crash.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 6

    Airbag Sensor

    Klim Valeyev, Hesam Akbarnejad, and Marco Tundo


     
    The Airbag is a very common automobile safety device and the goal of our research project
    was to be able to explain the processes that go on behind the scene whenever it is
    activated.
    And so this is what we found out:
     
            Airbags are inflated by gas produced in a chemical reaction
    o       Gas inflates the airbag  with velocities of up to 320km/h
    o       The entire process happens in 20-30 milliseconds
            The chemical reaction is triggered by an ACU (Airbag Control Unit)
    o       The ACU has to decide whether or not to deploy the airbag once the sensors
    located throughout the car report a collision
    o       The circuit has to be very reliable; no room for error is allowed
    o       The ACU has to make the decision really fast;  in less time than it takes for a
    collision to occur
    Since we were studying electronics, our main goal was to model the circuitry of the ACU
    and show the entire process of airbag deployment:
     
    1.      Sensors detection collision
    2.      ACU receives and processes information
    3.      ACU decides to deploy airbags
    4.      Passengers survive the crash
    There are numerous sensors scattered all over an average modern day vehicle:
            Accelerometers – measure acceleration/deceleration
            Impact sensors – detect collision and physical damage
            Pressure sensors – detect physical pressure applied to the vehicle
            Tachometers - wheel speed sensors
            Brake pressure sensors – monitor brake
            Gyroscopes - devices that detect rollovers
     
    The ACU is programmed to deploy different airbags (front, side, knee etc.) depending on
    the different combinations of data received from sensors.  For instance, if the on-board
    gyroscope detects that the vehicle has flipped over, the front airbags may not necessarily
    have to be deployed. However, side airbags will need to be activated because the person
    will likely fall on their side.
    The following flow chart shows how the information is received and processed by the ACU
     
    Figure 1 – Airbag activation process block diagram
     
    Sensors are very small devices and the signals they produce are relatively weak.   The
    signal has to be amplified in order to analyze it.  However, amplification may interfere
    with the signal, so the signal must be filtered as well.
    The signals are then sent to the Multiplexer.  The Multiplexer receives numerous signals
    and presents them to the ACU in orderly fashion, because the ACU can only process one
    signal at a time.
    Prior to that, the signal has to go through the ADC (Analog-to-Digital Converter).  The
    ACU is a digital device and can only accept digital signals communicated using machine
    code, whereas the electric pulses from sensors are examples of an analog signal.  Thus they
    need to be converted first.
    LINK
    http://www.matni.com/Arabic/Elec-Info/LM741%20DETAILS/741.html

    http://www.zen22142.zen.co.uk/Circuits/Alarm/5zalm.html

    http://www.satsleuth.com/schematics.htm

    http://www.piclist.com/images/www/hobby_elec/e_pyro1_1.htm

    http://sound.westhost.com/project30a.htm
    Microphone Mixer

    R1, R2, R3 3 1K 1/4W Resistor


    R4, R5, R6 3 10K Logarithmic Pot
    R7 1 1Meg 1/4W Resistor
    R8, R10 2 10K 1/4W Resistor
    R9, R11 2 100K Linear Pot
    C1, C2, C5, C6 4 0.1uF Ceramic Disc Capacitor
    C3, C4 2 22nF Ceramic Disc Capacitor
    U1, U2 2 741 Op Amp
    J1, J2, J3 3 Input Jacks Of Your Choice
    MISC 1 Board, Wire, Knobs, IC Sockets

    http://www.aaroncake.net/circuits/mixer2.asp

    You might also like