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COMPACT NETWORK ARCHITECTURE
The electrical system on this vehicle adopts the COMPACT architecture, developed specifically to
integrate the most sophisticated electronic functions in the most efficient way.
This structure is the vehicle's "nervous system": it directly controls all the body functions (access
control, visibility, on-board information, comfort etc.) and dialogues with the various chassis and power
unit subsystems, optimising dimensions, diagnosticability, reliability, weight and cost of the system.
The most important control unit in the architecture is undoubtedly the Body Computer, in which the
following converge:
•
A high-speed C-CAN (500 kbit/s) which connects the control units for dynamic control of the
vehicle: Powertrain Control Module, ABS control units and Automatic Transmission, Driving
Advisor and Gateway control units when present;
•
A low-speed B-CAN (50 kbit/s) for the so-called "body-related" functions: connects the control
units for the Instrument Panel, Airbag, Parking Sensors, Automatic Climate Control, Radio
and/or Navigator, Tyre Pressure Sensors and managing a Trailer, if present
•
A low-speed serial line (LIN)(20 kbit/s) which connects the Anti-Theft, Rain/Dusk Sensor and
Battery Sensor (IBS) control units
The two C-CAN and B-CAN networks are physically separated but both flow into the NBC, which is
considered the master node for the two networks; it is also the gateway which allows the transfer of
information/data from one network to another.
The diagnosis connector (EOBD) is external to the Body Computer node and joins the two CANs.
Therefore, node diagnosis is not performed by means of diagnosis messages sent through the
communication networks, except for the Power Steering and Additional (Webasto) Heater control
units, which are connected to the diagnosis socket directly via K lines.
The Body Computer also manages all the functions for the user, central door locking and unlocking
with or without remote control, external lighting control (headlights, light clusters and direction
indicators), internal lighting control (front and rear roof lights), wiping, heated rear window, etc.
The distribution and protection of the power lines is ensured by three fuse/relay boxes:
•
the primary box, to protect the main power supply section, is located on the battery, fixed
directly to the positive terminal;
•
the second box is connected directly to the Body Computer to protect all the devices that it
manages;
•
the third is inside the engine compartment as a protection and junction for all devices for the
engine itself (Powertrain Control Module, sensors, actuators, fans, etc.). It also has a terminal
to connect to for carrying out emergency starting.
Finally, it is also possible to have a fourth junction unit when the vehicle has the optional
electrical setups for vehicles to be converted subsequently by coach work fitters (camping
cars, mobile shops, refrigerated vehicles, armoured vehicles, ambulances, etc.).
The main electronic components managed by the electronic architecture are described in the following
diagram:
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