Operation Manual

Overrun mode or braking
There are three possible operating modes when
the hybrid vehicle is decelerating:
R
energy recovery takes place even when the
vehicle is decelerating purely in overrun mode
(
Y page 225). The electric motor operates as
a generator and stores the recovered energy
in the high-voltage battery
R
when the brakes are applied lightly, the vehi-
cle is slowed down further by the electric
motor This increases the energy recovery tak-
ing place (
Y page 225) The electric motor
operates as a generator and stores the recov-
ered energy in the high-voltage battery.
R
when the brakes are applied with greater
force, the service brakes are also used to slow
the vehicle down. The two systems work
together
Urban driving
Energy is recuperated during frequent deceler-
ation and stopping in city traffic.
The vehicle can be driven by the electric motor
alone up to a speed of approximately 120 km/h.
The vehicle is driven by the electric motor alone
only when all conditions for the automatic
engine switch-off are fulfilled.
Further information on the automatic engine
switch-off (
Y page 231).
Driving on inter-urban roads
The following phases are possible when driving
on inter-urban roads:
R
rapid acceleration (boost mode)
R
constant energy consumption
R
energy recuperation
R
electric operation mode
A great deal of recovered energy may be avail-
able, depending on the route profile. This
reduces consumption and emissions.
Highway driving
During highway driving, fuel consumption and
emissions are favorably influenced in particular
by reduced power losses.
If the driver removes his foot from the acceler-
ator pedal in drive program E and a speed of
160 km/h is not exceeded, the combustion
engine is automatically switched off.
Further information on the automatic engine
switch-off (
Y page 231).
ECO start/stop function
General notes
The ECO start/stop function switches the inter-
nal combustion engine off automatically when
the vehicle stops moving and at high speeds
(
Y page 232).
All vehicle systems remain active, e.g. the auto-
matic climate control.
The ECO start/stop function is only available in
drive programs C and E. Electric-only operation
is only possible in drive programs C and E. Addi-
tional information for drive programs
(
Y page 229).
Automatic engine switch-off
The engine is switched off automatically, includ-
ing when:
R
the driver removes his foot from the acceler-
ator in drive program E and a speed of
160 km/h is not exceeded (
Y page 232)
R
the engine has reached its operating temper-
ature
R
the driver’s seat belt is fastened and the
driver’s door is closed
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the driver only slightly depresses the accel-
erator pedal in order to, for example, maintain
the current speed for a limited distance
R
the hood is closed and engaged properly
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the high-voltage battery is charged suffi-
ciently
R
no malfunctions are present in the hybrid
drive system
The internal combustion engine will not be
switched off automatically, if:
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the self-diagnosis function of the engine con-
trol unit is still active
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there is a malfunction in the hybrid drive sys-
tem
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the climate control of the vehicle requires it
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the high-voltage battery is being charged
(
Y page 227)
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automatic emissions tests are running
PLUG‑IN HYBRID operation
231
Driving and parking
Z