Black Box Design

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					                        Black Box Design

Ahmad Asi, Benjimin Chang, Mehdi Dadfarnia, Serge Kamta,
                      Ifzalul Khan
                    University of Maryland, College Park




                           10 December 2010



    Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Overview

     Functions:
           Video/Audio Recording
           Vehicle Event Recording
           On-Board Diagnostics
           Internal Components Should Withstand 3400g and 1000o   C
           Mirroring for Fault Tolerance
           Solid-State Disk for Reliability
           Environmental Status
           Tamper-Resistance: Encrypted Data, TPM

     Sensors:
           Pressure Sensor
           Cameras

     Communication:
           Wireless monitoring through Satellite



        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Problem Statement


     Provide feedback about the status and health of the vehicle
     Record accident data
     Provide security of data
     Can be used by:
          Field Technician Soldiers
          Command Center Mechanic
          Data Analyst

     Can Be Used At:
          Field
          Command Center




        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Potential Benets



      Vehicle Tracking through GPS
      Remotely monitoring vehicle status
      Accident Prediction, avoiding catastrophic failure
      Detect and report the reliability of the vehicle
      Eciency data to improve vehicle and overall system
      performance
      Modular versatility that allows integration into several types of
      vehicles



         Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Project Stakeholders



      ENES489P Black-Box Team and Advisors
      Military Logistics Agency
      Soldier
      Budget
      Military Doctrine
      Manufacturers




        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Use Cases




     Use Case 1: Installation and Testing
     Use Case 2: Operation
     Use Case 3: Retrieving Data
     Use Case 4: Threats to System/Reliability
     Use Case 5: Maintenance




        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Use Case 1: Installation and Testing

                                             Mechanic
                                          receives black
                                             box from
                                         systems analyst




                               Input            Input                 Input
                              Number          Types of            compartment
                                 of           Sensors              dimensions
                              Sensors




                                             Test Software
                                                verifies
                                              compatibility
                                                             No
                                                                                  Notify
                          Is the black Box                                      manufacture
                          compatible?
                                                       Yes


                                               Mechanic
                                             installs black
                                                  box

                                                                         Minor calibration
                                                                             needed
                                                         No
                          Installed Correctly?
                                                                               Major
                                                 Yes                      reconfiguration
                                                                             required




        Asi, Chang, Dadfarnia, Kamta, Khan                             Black Box Design
Use Case 2: Normal Operation
         Base Mechanic                Field-Tech Soldier                                                               Black Box System                                 Command Center Analyst




                                   Turn on vehicle
                                                                                                 Retrieve
                                                                                            GPS/OBD2/camera
                                                                                            retriever data via
                                                                                             computer's usb
                                                                                              interface, and
                                                                                                process it




                                                                                                 GPS/OBD2/camera
                                                                                                      software
                                                                                                 uses/manipulates
                                                                                                        data




                                                                                                                                    Data is also
                                                                                                     data is stored                    stored
                                                                                Data is                in computer                     (same
                                                                            processed and             hard-drive in                 manner as
                                                                             displayed on            1-minute data                       the
                                                                             the monitor                  packets                    computer
                                                                                                     designated as                  hard-drive)
                                                                                                      'good' data or                    in the
                                                                                                         'bad' data                   external
                                                                                                                                    hard-drive




                          Data seems
                          irregular/warning
                                                           No data                                                                                                           Data retreival
                          /malfunctioning
                                                           irregularities                                                                                                    (has its own
                                                                                                                                                                              used case
                                                                                  No excess data           data reaches 70%                                                     activity
                                                                                                           capacity in                                                         diagram)
        Maintenance
        (has its own                                                                                       computer
         used case                                                                                         hard-drive or
      activity diagram)                                                                                    external hard-drive                     Data Recorder acts
                                                                                                                                                   in accordance with
                                                                                                                                                      the 'Accidents'
                                                                                                                                 Accident                Operation
                                                                                                                                 Operations         Mechanisms (has
                                                                                                                                                   its own used case)


                                                                                                        Normal Operations




                                     Continue Using                                                       Data Rotator
                                      the Black Box                                                         program
                                         System                                                            deletes the
                                                                                                          oldest 'good'
                                                                                                         excessive data




                Asi, Chang, Dadfarnia, Kamta, Khan                                                            Black Box Design
     Black Box Design               Asi, Chang, Dadfarnia, Kamta, Khan
                        r e d a e R e s a el e R
                        ataD daolnwoD
 noitcennoC
                                  nI goL
   etaitinI
    pa M n O
                       redaeR tcennoC
elciheV etacoL
                                                      x o B k c al B
                   ? e vi t c A                       n O re woP
                 x o B k c al B
                         re woP kcehC
                                      ?sseccA lacoL
                                   Use Case 3: Retrieving Data
Use Case 4: Accident Operations/Reliability



                                Combat Effects                    Combat Effects




                                                 Car Accident?
                       NO                                                    YES

                                                                                   Is Main Power Supply
                                                                                   Available?

                                                             YES                        NO
          Black Box operating
             under normal
              conditions

                                                       Data Rotator                  Data rotator
                                                     software does                     software
                                                        not delete                 enables system
                                                      oldest 'Good'                  to act under
                                                     data. Records                      normal
                                                     until it fills up             conditions for 30
                                                                                      minutes and
                                                                                    then switches
                                                                                      to a locator
                                                                                        beacon.




        Asi, Chang, Dadfarnia, Kamta, Khan       Black Box Design
Black Box Design               Asi, Chang, Dadfarnia, Kamta, Khan
           ecnatsissA sehctapsiD
             retneC dnammoC
   emoH nruteR              ?lanoitarepO
                               elciheV
 retneC dnammoC                   rosneS dna edoC
   ot langiS dneS               rorrE rotarepO trelA
            ? at a D
          lamronbA
                ataD cirotsiH
              ot ataD erapmoC
                 a t a D e vi e c e R
                              ?lanoitcnuF
                              sr os n eS l l A
                               xoB kcalB
                                        Use Case 5: Maintenance
System Design

                                              Camera/GPS/Monitor
                                            Records vehicle interior events,
                                          provide user feedback of black box,
                                              and provides loca on data

                            Right Boundary                           Pressure Sensors
                                Camera                          Used for passenger detec on




    Front Boundary
        Camera


                                                                                                                Rear Boundary
                                                                                                                   Camera


       On-Board Diagnos cs
    Built-in vehicle sensor network for                                          Black Box (Obsecured)
       various vehicle sub-systems           Le Boundary                        Located below sea ng area for
                                               Camera                                    obsecurity




            Asi, Chang, Dadfarnia, Kamta, Khan                         Black Box Design
Black Box Layout

                                    TPM                   Data
                                  Connector              Output

                                                                                        Ext GPS
                                                                              GPS        Ant.




                                                         Memory
                                                                  Memory
                                                 CPU




                                                                                        Input Ports
                                           TPM
         Back-Up         Power                                                Data
         Ba ery          Supply                                            Acquisi on
                          Unit                                                Unit


                                     Solid State   Solid State
                                      Disk (A)      Disk (B)
                                                                             WIFI
                                                                                        Ext WIFI
                                                                                          Ant.
                                              “eFUSE”

                     Main Power
                       Input



        Asi, Chang, Dadfarnia, Kamta, Khan         Black Box Design
Requirements


                          High Level Requirements
         Requirement 1                  Be as indestructible as possible
         Requirement 2                  Be mountable to army vehicles
                                        Store data from camera, vehicle
         Requirement 3
                                             sensors, and location (GPS)
                                         Have accessible data for army
         Requirement 4
                                             command and base centers
         Requirement 5                          Be tamper-resistant
         Requirement 6                 Accommodate accident-scenarios
                                      Have accessible data displayed for
         Requirement 7
                                              Field-Technician Soldiers




        Asi, Chang, Dadfarnia, Kamta, Khan      Black Box Design
Traceability



                       High-Level         Component
     Used Case                                              Description    Components
                     Requirement          Requirement

                                                             Black box
                                                             must store     Memory,
                                           RAM 1, 2;         data and it   Processor,
      Normal          Requirement         PRC 1, 2, 3;       must do so     SSD and
     Operations            3               CHD 1,2;         as eciently   Redundant
                                           EHD 1, 2          (eg speed,       SSD
                                                              power) as
                                                              possible.



          Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Trade-O Analysis: Performance vs. Cost




        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Trade-O Analysis: Power Eciency vs. Cost




        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Trade-O Analysis: Performance vs. Power Eciency




        Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design
Summary




             Trade-O Curve                  Points of Interest
            Performance vs Cost    22, 1, 10, 27, 17
          Power Eciency vs Cost 27, 22, 24, 17, 13, 1
           Performance vs Power    1, 7, 27, 17, 22
                    All              22, 1, 27, 17




      Asi, Chang, Dadfarnia, Kamta, Khan   Black Box Design

				
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