Mild Hybrid Version Operating Principle - Alfa Romeo Tonale Owner's Handbook Manual

MILD HYBRID VERSION
OPERATING PRINCIPLE
(where provided)
HYBRID SYSTEM EQUIPMENT
1) 2) 3) 4) 5)
Tonale Mild Hybrid is a MHEV (Mild
Hybrid Electric Vehicle).
The hybrid system of the car uses:
an electric motor ("e-machine")
integrated in the electrified dual clutch
automatic transmission, connected
mechanically to the heat engine and
powered by a lithium ion auxiliary battery
(48V)
a BSG (Belt Starter Generator)
alternator/starter, activated by the
auxiliary services belt, which makes it
possible to start the heat engine with
the car stationary or when driving at
a low speed. In the case of a fault in
the 48V system, the BSG (Belt Starter
Generator) alternator/starter can act as
an alternator and charge the traditional
12V battery. In some phases, such as
during "electric driving", it replaces the
starter motor of the heat engine. In the
latter case, when the car is stopped with
automatic engine shutdown, the engine
will be restarted by the BSG (Belt ignition
device Generator) alternator/ignition
device.
a 48V lithium ion auxiliary battery
with the function of energy accumulator
for the car
The Mild Hybrid system therefore
enables improved performance (better
response in transients), while reducing
fuel consumption and CO 2 emissions.
NOTE The Mild Hybrid system does not
operate continuously, but is activated
based on the state of the car, the state
of charge of the auxiliary lithium ion
battery (48V), the driving conditions
(acceleration/deceleration/braking,
engine starting) and on the conditions of
the road surface (e.g. downhill road).
The Mild Hybrid system provides a
power boost to the internal combustion
engine during vehicle start-up when more
traction torque is required, or at times of
higher fuel consumption and emissions.
In certain driving conditions, the Mild
Hybrid system control module regulates
the energy flows based on the charge
level of the auxiliary lithium ion battery
(48V).
With the electrified dual clutch
automatic transmission lever in P
("Park") and N ("Neutral"), an increase in
noise from the engine compartment may
be heard as the auxiliary battery (48V)
charging phase begins: this is normal and
not a fault.
DC/DC converter
To permit the conversion of the current
originating from the 48V system into
current that can be used by the 12V
system, DC/DC is used: when driving
the car, the DC/DC acts as a converter,
making it possible to power and charge
the 12V battery. The connecting cable
allows the 12V and 48V system to
be interfaced and to power the 12V
system through the 48V auxiliary
battery, the DC/DC converter and the
BSG (Belt ignition device Generator)
alternator/ignition device.
OPERATING MODE
The Mild Hybrid system has three modes
of operation, which can be selected to
adapt the response of the vehicle to
driving needs: Dynamic, Natural and
Advanced Efficiency.
These operating modes can be selected
using the "DNA" selector switch on the
central tunnel fig. 3.
For more information on how to operate
the system, refer to the chapter "Alfa
DNA™ system with ESC OFF (excluding
Plug-in Hybrid versions)" in the "Starting
and driving" section.
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