A control system called SELESPEED supervises
and governs the operation of the manual gearbox via an electrohydraulic
device.An electronic control unit manages a complex
operating logic which enables the gearbox to be used in both 'semi-automatic'
conditions, in which the driver manages the engagement of the gears
using the lever or the two steering wheel buttons, and automatic
'CITY' mode which delegates gear change management to the electronic
system.The electronic control unit communicates
with the engine management control unit via the CAN network and
two dedicated lines, one for the engine rpm signal and one for diagnostics.The control unit drives, by means of a complex
operating logic, an electrohydraulic unit located on the gearbox,
via a specific electric pump.
For more details,
Characteristic of working principle 2127 ELECTRO-HYDRAULIC SELECTION.
GEARBOX EXTERNAL. CONTROLS
.
The supply lines to the control unit and
the various system components (sensors and actuators) are protected
by two fuses located in the underfacia control unit.A special maxifuse in the engine compartment
junction unit supplies the system control pump line.
Control unit self-diagnosis notifies of
the onset of these faults via a special warning light in the instrument
panel: The SELESPEED control unit sends the instrument panel information
on the speed engaged. This is shown on the display. For more details,
Characteristic
of working principle 2127 ELECTRO-HYDRAULIC SELECTION. GEARBOX EXTERNAL. CONTROLS
.