Driving
CONTROLS
The following exemplary driving situations may
be suitable:
Range Extender is designed to enable further
driving in situations, in which the purely electric
range is not sufficient. E.g., the next charging sta‐
tion can be reached.
▷ Rolling on a straight downhill route without
obstacles.
With a very low charge state of the high-voltage
battery, the drive power is reduced on sharp up‐
hill grades or at high speeds in order to allow
continued driving.
▷ Coasting on a route without obstacles.
Avoid late or abrupt braking.
Acoustic pedestrian protection
This avoids a complete discharge of the high-
voltage battery.
Depending on the country-specific version, the
system generates a continuous driving noise
during electric driving up to approx.
20 mph/30 km/h.
A Check Control message indicates an upcom‐
ing reduction in drive power. The power reduc‐
tion is displayed in the performance display, refer
to page 112.
A speaker system broadcasts the noise to the
surroundings.
As a result, other road users, for instance pedes‐
trians or cyclists, can better perceive the vehicle.
Automatic maintenance run
Avoid having long periods when the Range Ex‐
tender is not used. To ensure functional reliabil‐
ity, the Range Extender is automatically activated
at certain intervals for a few minutes while driv‐
ing. Respective Check Control messages indi‐
cate the maintenance run. It the maintenance run
of the Range Extender is occurring at an unfavor‐
able time, it can be canceled by pressing the
Start/Stop button. It postpones the maintenance
run.
Range Extender
Increasing the range
If the charge state of the high-voltage battery
drops during travel to a minimum value, the
Range Extender starts and supplies the required
electrical energy for continued driving.
The icon on the charge state indicator desig‐
nates a Range Extender activation time.
Should the high-voltage battery be fully charged
or if there is not enough gas in the tank then a
maintenance run will not be executed.
The Range Extender controls its output automat‐
ically, turns itself off and restarts according to the
driving situation.
Heavily discharged high-voltage
battery
If the high-voltage battery is heavily discharged
during the trip, the performance and some com‐
fort features are reduced step-by-step to extend
the range.
If Range Extender is activated, the current
charge state of the high-voltage battery is main‐
tained. If necessary, the Range Extender charges
the high-voltage battery until the charge state at
the time of the activation of the Range Extender
has been reached.
The Range Extender has no direct connection to
the drive train.
Heated high-voltage battery
With a stationary vehicle
Using the Range Extender
In isolated cases, when the vehicle is stationary,
it is possible for the high-voltage battery to over‐
heat, for instance, as a result of extreme hot or
cold temperatures or direct sunlight. Drive-ready
Purely electric use of the vehicle offers the full
performance capability of the drive and the most
efficient use of the vehicle.
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