Now all vehicles have build-in computer, which has ECU(Electronic
Control Unit).
ECU is the brain of a vehicle, which executes control logic in all modules
including:
1)
Fundamental functions, such as
integration of brake, light, radar.
2)
Management of transmission
mode, such as switch of normal mode, sport mode, economy mode.
3)
Management of special mode,
such as switch of two-wheels driving, four-wheels driving.
4)
Vehicle history, such as
driving miles, gas filling logs.
5)
Integration of additional
function, such as backward driving image.
6)
Integration of entertainment,
such as radio, mp3 player.
Even for the same type of vehicle, while having different
configuration, it requires to download different software accordingly.
In Final Assembly Shop, assembly line is flexible to meet customers’
unique requirement.
Diagram 2.12-1 shows key process of Software Download.
Diagram
2.12-1 Software Download process
Firstly, we need to setup a software BOM system. In this BOM system,
each software will be regarded as a special virtual part, and will be defined
with these attributes:
1)
Virtual part number.
2)
Version number.
3)
Binary file.
Software BOM is
quite similar in form as Engineering BOM and manufacturing BOM.
When MES
generates a Work Order, it triggers MES to download whole software list from
Software BOM System.
Secondly, when vehicle passes PBS Out to come to Final Assembly
Shop, conveyor PLC will read RFID to identify vehicle, and sends VIN number to
MES.
By querying VIN number, MES gets software BOM dataset, and sends it
to Software Download Server.
Software Download Server will check if it already has binary files
in local, if not then download from Software BOM System.
Then at last, when vehicle comes to Software Download station,
worker scans barcode of assembly sheet to get VIN number, the Software Download
terminal will download binary files from Software Download Server, and then
down them to vehicle ECU.
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