Electronic control system overview
Electronic control system is composed of various computers and its communication line. In our system, 2
computer (EECU, VECU) is programmable and 1 computer (MDU) is not.
Communication is important thing to control the machine properly.
We use two communication lines that is international protocol.
The line is twisted to protect the bus from electrical interference.
CAN bus (SAE J1939)
CAN stands for Control Area Network. Actually this signal control machine and is very fast.
Information bus (SAE J1708)
This bus is connected to all control units and the service socket and have back-up function for the control
bus of E-ECU. The system status is continuously updated. By using this bus, we can use MATRIS and
VCADS Pro and can program the ECU.
MID (Message Identification Description):
Unique number for each control unit
PID (Parameter Identification Description):
Unique number for each parameter
PPID (Proprietary Parameter Identification Description):
Volvo-Unique number for each parameter
SID (Subsystem Identification Description)
Unique number for component
PSID (Proprietary Subsystem Identification Description)
Volvo-Unique number for component
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