2
ASR system (electronic anti-skid device)
37
ASR system (electronic
anti-skid device)
The ASR system helps prevent the
driving wheels from skidding during
acceleration via the engine's ECU
action (delayed spark advance,
reduced engine supply throttle
opening and injection cut-off), and
that of the rear brakes.
The ASR's action helps to increase the
stability and the vehicle's active safety
when it is running, especially in the
following situations:
– internal wheel skidding on curves
because of the dynamic variations of
the load or excessive acceleration
– excessive power transmitted to the
wheels, also in relation to road
conditions
– acceleration on slippery surfaces or
where there is snow or ice,
– in the event of loss of grip on wet
roads (aquaplaning).
The ASR acts in combination with the
electronic suspension adjustment
system: in normal conditions (SPORT
mode disabled) stability is prioritized
in low and medium grip conditions,
while with the SPORT mode enabled
the system gives priority to the
traction, optimizing the vehicle's
performance.
MSR function (engine braking
torque adjustment)
The ASR system also helps control the
engine braking torque when the
accelerator pedal is released under low
grip conditions (snow, ice etc.): in these
conditions, in fact, the engine's high
braking torque may cause instability of
the vehicle.
The system, using the same sensors as
the ABS, detects the skidding from
one or both of the driving wheels
when the accelerator is released and
opens the engine supply motorized
throttle, thereby reducing the braking
torque and restoring the driving
wheels' maximum grip conditions.
WARNING: The maximum
deceleration that can be obtained with
the engine brake still depends on the
tire grip on the road. Obviously, snow
or ice on the road greatly reduce the
grip values.
To Next Page
Loading...
