Automatic starting of the internal
combustion engine while the vehicle
is being driven
Depending on the hybrid mode set, the internal
combustion engine is started automatically while
the vehicle is being driven under conditions
such as the following:
▷ With high acceleration or on upward gradi‐
ents.
▷ By depressing the accelerator pedal beyond
the full-throttle position, kickdown.
▷ Charge level of the high-voltage battery is too
low.
▷ Selector lever position M/S is engaged.
▷ During manual gear-shifting using the shift
paddles.
▷ Anticipatory hybrid drive with active route
guidance, for example outside built-up areas.
▷ Request to the hybrid components depend‐
ing on system.
Automatic stopping of the internal
combustion engine while the vehicle
is being driven
Depending on the driving situation, the internal
combustion engine is stopped if the require‐
ments for electric driving are met.
Automatic Start/Stop function,
coasting
Principle
The Automatic Start/Stop function shuts down
the internal combustion engine when you are
driving, braking and rolling, and when the vehicle
is stationary. The condition of decelerating with‐
out energy recuperation with the internal com‐
bustion engine switched off is also called coast‐
ing. Comfort functions such as automatic air
conditioning are still supplied by the high-voltage
battery and may remain switched on.
After coasting, the internal combustion engine or
electric motor provides the necessary drive
power automatically again, depending on the hy‐
brid mode.
Operating requirements
Coasting is possible under the following precon‐
ditions:
▷ In the HYBRID ECO PRO driving mode if the
traffic situation allows you to do so.
▷ Transmission position D engaged.
Energy recuperation: CHARGE
Principle
The electric motor acts as a generator and con‐
verts the kinetic energy of the vehicle into electri‐
cal energy during braking and rolling.
The high-voltage battery is charged by this en‐
ergy recuperation. If needed, this saved electrical
energy is supplied back to the electric motor.
General
Depending on the set hybrid mode, the high-
voltage battery is recharged at different rates,
and the vehicle is decelerated at different rates
when rolling.
Operating requirements
Recovering kinetic energy depends on the
following factors, for example:
▷ Vehicle is in motion.
▷ Selector lever is in position D or M/S.
▷ High-voltage battery is not completely
charged.
Displays in the instrument cluster
For further information:
Displays of the hybrid system, see page 177.
Seite 153
Driving
CONTROLS
153
Online Edition for Part no. 01405A1EA53 - X/20
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