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258 Driving and parking
If road signs are hard to detect, e.g. due to
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dirt, snow or insufficient lighting, or because
they are obscured.
If the information in the navigation system's
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digital map is incorrect or out of date.
If signs are ambiguous, e.g. road signs in road-
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works or in adjacent lanes.
If the radar sensors are dirty or obscured.
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When you drive on roads with steep gradients.
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If there are narrow vehicles in front, such as
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bicycles or motorcycles.
Recuperative brake system (plug-in hybrid)
▌Function of the recuperative brake system
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The function is only available for plug-in
hybrids.
Depending on the selected recuperation level, the
electric motor is operated as an alternator when
in overrun mode and during braking in order to
charge the high-voltage battery while driving. As
soon as you take your foot off the accelerator
pedal when the vehicle is in motion and in trans-
mission position h, recuperation in overrun
mode is initiated.
The higher the recuperation, the more sharply the
vehicle is braked when coasting and the more
electrical energy is fed into the high-voltage bat-
tery.
The deceleration in overrun mode may not be suf-
ficient depending on the driving conditions. Decel-
erating to a standstill is not possible. Also brake
with the service brake if necessary. Always adapt
your speed to the driving conditions and keep a
sufficient distance.
The recuperative brake system has the following
characteristics:
supports braking with electronically controlled
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brake force boosting
converts the kinetic energy of the vehicle into
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electric energy
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If you brake hard, the mechanical brake is
also used. This means that the maximum
recuperative energy cannot be recovered. The
more you accelerate and brake in an anticipa-
F118 0058 02
tory manner, the more efficiently energy can
be recuperated.
System limits
The braking effect of the electric motor during
recuperation in overrun mode may be reduced or
may not be available at all in the following situa-
tions:
when the high-voltage battery charge level
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increases
if the high-voltage battery is not yet at a nor-
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mal operating temperature
In these cases, the desired deceleration is set by
the brake control system.
▌Manually setting recuperative deceleration
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This function is only available for a plug-in
hybrid.
You can use the steering wheel gearshift pad-
dles to adjust the intensity of recuperation in
drive programs n, o and Î.
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