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Driving using theinternal combustion
engin eand charging th ehigh-voltage bat -
tery
The engin epowers th evehicle. The engin ealso
powers th eelectric motor. The electric motor
operates as agenerator. The high-voltag ebat -
tery is bein gcharged.
The arrows fo rth eenerg yflo ware shown in
white.
Driving using th einternal combustion
engin eand discharging th ehigh-voltage
battery
The engin epowers th evehicle. If th evehicl eis
approachin g adownhill gradien twit h a high
potential fo renerg yrecuperation ,th econdition
of charg eof th ehigh-voltag ebattery is inten-
tionally kept low or intentionally reduced.
The arrows fo rth eenerg yflo ware shown in
white.
Further information on th eroute-based operat -
in g strategy (
Ypage 253).
Electricoperation mode
The electric motor powers th evehicle. The high-
voltag ebattery supplies energ yto th eelectric
motor.
The arrows fo rth eenerg yflo ware shown in
green .
Electri coperation mode and charging th e
high-voltage batter y
The electric motor is operatin gas agenerator,
e.g. in overrun mod eand when brakin g
(
Ypage 253). The kineti cenerg yof th evehicl e
is converted into electrica lenergy. The high-
voltag ebattery is bein gcharged.
The arrows fo rth eenerg yflo ware shown in
green .
PLUG‑ IN HYBRID operation247
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Charging the high-voltage battery when
stationary
The engine and electric motor are switched off.
The arrows for the energy flow are not shown.
Further information on charging the high-volt-
age battery via:
Ra mains socket (Ypage 183)
Ra charging station (Ypage 186)
Ra wallbox (Ypage 185)
Displaying the total range and electrical
range
The approximate range is based on the current
driving style.
XUseÑ on the steering wheel to call up the
list of menus.
XPress the :or9 button on the steering
wheel to select the Tripmenu.
XConfirm by pressing aon the steering
wheel.
XPress :or9 to select the approximate
total range and electrical range.
248PLUG‑IN HYBRID operation
Driving and parking
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Displaying fuel consumption andgenerated electricit y
:Fuelconsumption
;Electrical energ ygenerate d
Every bar of th egraph displays th eaverag evalu efo ron eminute.
Fue lconsumption indicator :may diffe rfrom th eindicator in th eFro m
Starttrip compute rin th e
Tri pmenu.
To reset th evalues: thevalues are reset alon gwit hth eFro mStart
trip compute r (Ypage 262).
XTo selectConsumption:turn and press th econtroller .
Fue lconsumption :and electrical energ y; generate dfo rth elast 15 minutes are shown in th e
COMAN Ddisplay.
Starting th eengin e
The vehicle start sin electric mode without th e
internal combustion engin e(noiseles sstart).
The internal combustion engin estart sonly after
th epowe rdemanded by th edriver exceeds th e
available powe rthat th eelectric moto rcan cur -
rentl yprovide.
Noiseless start operation is dependen ton th e
outsid etemperature and th eoperatin gtemper-
ature of th einternal combustion engine. If no tall
condition sfo rnoiseles sstart operation are ful-
filled, th evehicle start swit hth einternal com-
bustion engine.
XSwitc hon th eignition .
XDepress th ebrake pedal.
XObserv eth enote son startin gth eengin e
(Ypage 164).
XStart th evehicle (Ypage 164).
The vehicle is operational when READY indi-
cator :lights up.
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Pulling away
XDepress the brake pedal and keep it
depressed.
XShift the transmission to positionDor R.
XIf the Apply Brake to Shift from 'P'display message appears in the multifunction
display, depress the brake pedal more firmly
and select the desired transmission position.
XRelease the brake pedal.
XCarefully depress the accelerator pedal.
For further information on pulling away
(
Ypage 165).
Driving
Program selector button
Automatic drive programs E, S and E+
XPress program selector button :to change
the drive program.
The selected drive program appears in the
multifunction display. The program selector button allows you to
choose between different driving characteris-
tics.
E
EconomyRComfortable, economical
driving
RElectric operation mode
is used as often as possi-
ble
RECO start/stop function
is available
S SportRSporty driving style with
boost mode
RThe internal combustion
engine is always
switched on
E+ Economy
PlusRComfortable, economical
driving
RElectric operation mode
is used as often as possi-
ble
RThe ECO start/stop func-
tion is available
RDouble pulses in the hap-
tic accelerator pedal, as
an indication to release
the accelerator pedal
(
Ypage 251)
RAfter the accelerator
pedal has been released,
the coasting characteris-
tics of the vehicle are
adapted to the traffic
conditions
For further information on the automatic drive
program, see (Ypage 174).
Manual drive program
In addition to automatic drive programs Eand S,
you can switch to manual drive program Musing
the steering wheel paddle shifters.
In manual drive program M, you can briefly
change gear yourself by using the steering
wheel paddle shifters. The transmission must be
in position D. In manual drive program Mthe
internal combustion engine is always switched
on.
250PLUG‑IN HYBRID operation
Driving and parking
Page 253 of 438

Activating when driving with the electric motor:
XPull the left or right steering wheel paddle
shifter (Ypage 174).
The combustion engine is switched on. Man-
ual drive program Mis temporarily activated.
The selected gear and Mappear in the multi-
function display.
Activating when driving with the combustion
engine:
XPull the left or right steering wheel paddle
shifter (Ypage 174).
Manual drive program Mis temporarily acti-
vated. The selected gear and Mappear in the
multifunction display.
The ECO start/stop function is not available in
manual drive program M.
Haptic accelerator pedal
General notes
The haptic accelerator pedal helps you to
reduce the fuel consumption and emissions of
your vehicle.
There are two different functions available for
this purpose:
Ran additional point of resistance in E-MODE
operating mode (Ypage 243)
Ra double impulse in E+operating mode
(Ypage 250)
Additional point of resistance in the hap-
tic accelerator pedal
The maximum available electric performance is
indicated by a tangible point of resistance in the
haptic accelerator pedal.
The additional point of resistance is available in
E-MODE operating mode (
Ypage 243).
If you depress the haptic accelerator pedal
beyond the pressure point, the combustion
engine is switched on.
Double pulses in the haptic accelerator
pedal
A tangible double pulse in the haptic accelerator
pedal gives you a recommendation to release
the accelerator pedal. The combustion engine
can switch off and be disconnected from the
drive train (overrun mode).
The double pulse is available in drive program E+
(
Ypage 250). After the accelerator pedal has been released,
the coasting characteristics of the vehicle are
adapted to the traffic conditions.
To
avo
id getting too close to the vehicle in front,
you must apply the brakes manually when nec-
essary.
Driving tips
General driving tips
Drive carefully and maintain a safe distance
from the vehicle in front. Avoid frequent and
sudden acceleration as well as abrupt braking.
During partial electric driving, pulling away and
acceleration, the electric motor supports the
internal combustion engine.
During overrun in transmission position Dand
braking, the electric motor will operate as a gen-
erator.
Further information on the ECO start/stop func-
tion (
Ypage 252).
Additional driving tips (
Ypage 192).
Stationary vehicle
If the vehicle is stopped, the combustion engine
is, for the most part, switched off. Automatic
climate control continues to function. The elec-
tromechanically assisted steering gear allows
you to use the power steering without reduced
comfort.
Acceleration
Depending on the operating mode, pulling away
and driving under low load conditions are per-
formed:
Rentirely by electric propulsion
Rin combination with the internal combustion
engine
When accelerating at an increased or full load,
boost mode is utilized. The electric motor sup-
ports the internal combustion engine by provid-
ing additional torque when the accelerator is
depressed rapidly.
Overrun mode or braking
There are three possible operating modes when
the hybrid vehicle is decelerating:
Renergy recovery takes place even when the
vehicle is decelerating purely in overrun mode
(
Ypage 240). The electric motor operates as
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a generator and stores the recovered energy
in the high-voltage battery
Rwhen the brakes are applied lightly, the vehi-
cle is slowed down further by the electric
motor. This increases the energy recovery
taking place (
Ypage 240). The electric motor
operates as a generator and stores the recov-
ered energy in the high-voltage battery
Rwhen 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 81 mph
(130 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 (
Ypage 252).
Driving on inter-urban roads
The following phases are possible when driving
on inter-urban roads:
Rrapid acceleration (boost mode)
Rconstant energy consumption
Renergy recuperation
Relectric 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.
The internal combustion engine will be switched
off automatically, if:
Rthe driver removes his or her foot from the
accelerator pedal in drive program Eand a
speed of 81 mph (130 km/h) is not exceeded
Rthe driver removes his or her foot from the
accelerator pedal in drive program E+and a
speed of 112 mph (180 km/h) is not excee-
ded
Further information on the automatic engine
switch-off (
Ypage 252).
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
(
Ypage 253).
All vehicle systems remain active, e.g. the auto-
matic climate control.
The ECO start/stop function is only available in
drive programs Eand E+. Electric-only operation
is only possible in drive programs Eand E+.
Additional information for drive programs Eand
E+ (
Ypage 250).
Automatic engine switch-off
The engine is switched off automatically, includ-
ing when:
Rthe driver removes his or her foot from the
accelerator pedal in drive program Eand a
speed of 81 mph (130km/ h)is not exceeded
(
Ypage 253)
Rthe driver removes his or her foot from the
accelerator pedal in drive program E+and a
speed of 112 mph (180 km/h) is not excee-
ded (
Ypage 253)
Rthe engine has reached its operating temper- ature
Rthe driver’s seat belt is fastened and the
driver’s door is closed
Rthe driver only slightly depresses the accel-
erator pedal in order to, for example, maintain
the current speed for a limited distance
Rthe hood is closed and engaged properly
Rthe high-voltage battery is charged suffi-
ciently
Rno malfunctions are present in the hybrid
drive system
The internal combustion engine will not be
switched off automatically, if:
Rthe self-diagnosis function of the engine con-
trol unit is still active
Rthere is a malfunction in the hybrid drive sys-
tem
Rthe climate control of the vehicle requires it
Rthe high-voltage battery is being charged
(Ypage 246)
Rautomatic emissions tests are running
252PLUG‑IN HYBRID operation
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Automa tic engine start
The automatically switched-off internal combus -
tio nengin estart sautomatically in certai nsitua-
tions ,if:
Rth epower demand from th edriver via th e
accelerato rpedal is greate rthan th eelectric
motor alon ecan provide
Rth edriver switches to driv eprogram Sor M
Rthecondition of charge of th ehigh-voltage
battery has reached th elower limit
Rth esettings of th eautomatic climat econtrol
require it, e.g. at external temperatures abov e
30 †
Overru nmod e
In overrun mode, th ecombustio nengin eis
switched off and is disconnected from th edriv e
train. The electric motor:
Rgenerates low thrust ,whic hcorrespond sto
th eoverrun mod eof an active combustio n
engin e
Rfunction sas agenerator and produce sth e
necessary energ yfor th eauxiliary consumer s
and charge sth ehigh-voltage battery
Ove rrun mod eis possible in th efollowin gspee d
range:
Rin driv eprogram Ebelow 81 mph (13 0km/h)
Rin driv eprogram E+below 11 2mph
(18 0km/h)
In driv eprogram E+,after th eaccelerato rpedal
has been released th ecoasting characteristic s
of th evehicl eare adapted to th etraffic condi-
tions .Further information about th ehaptic
accelerato r
p
edal (Ypage 251).
Route-based operating strategy
Forth eroute-based operating strategy, th esys-
te m factors in information about th eexpecte d
rout ewhen rout eguidance is active.
The information on th erout eis provide dby th e
multimedia system and includes th efollowing:
Rroad categories
Rspee dlimitation s
Rdataon downhill gradients The use of electric energ
yis automatically opti-
mally distributed from th ebeginnin gto th een d
of th ejourney, usin ginformation about th e
route. The distribution is pre-emptive and takes
int oconsideration :
Rthesections of th ejourney ahead
Rth eenerg yconsumption on th ewhole rout e
The condition of charge of th ehigh-voltage bat -
tery is thus systematically controlled. In addi-
tion, th econtrol function takes int oaccoun t
that:
Rth efuel saving sthroug hth euse of electrical
energ ycan vary, depending on th erout e(e.g.
urban ,interurban or highway)
Rth euse of electrical energ yis held available in
particular for electric operation (e.g. urban
routes)
The vehicl ethus automatically select sth eopti-
mum driving mod efor th erespectiv esectio nof
th eroute.
The route-based operating strategy is available
under th efollowin gconditions:
Rdriv eprogram E+is selected
RHYBRID driving mod eis selected
Ractive rout eguidance is activated
Rsuitable map dat ais available
When th eroute-based operating strategy is
bein gused, th earea in fron tof th evehicl eis
shown as green in th emultifunction display.
Parking
XApply th eelectric parking brake.
The red !indicator lamp in th einstrumen t
cluste rlight sup.
XUse th eDIRECT SELECT leve rto shif tth e
automatic transmission to P.
XSwitch theignition off .
The READY indicator in th einstrumen tcluste r
goes out .
Further information on parking and switching off
th einternal combustio nengin e (
Ypage 190).
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Problems with PLUG-IN HYBRID operation
Internal combustion engine
ProblemPossible causes/consequences and MSolutions
You cannot start the
internal combustion
engine. The multifunc-
tion display shows no
display messages. The
READY indicator in the
multifunction display is
off.For example, self-diagnosis is not yet complete or the hybrid drive
system is malfunctioning.
XSwitch off the ignition and turn it back on.
XTry to start the internal combustion engine again.
If the internal combustion engine still does not start:
XConsult a qualified specialist workshop.
You wish to pull away,
but the ECO start/stop
function does not start
the internal combustion
engine. The READY indi-
cator in the multifunc-
tion display is off.The ECO start/stop function has failed. The warning and indicator
lamps in the instrument cluster light up.
XShift the transmission to P.
XSwitch off the ignition and turn it back on.
XStart the engine.
The hybrid drive system is faulty.
XConsult a qualified specialist workshop.
Recuperative Brake System
ProblemPossible causes/consequences and MSolutions
Braking resistance is
reduced and brake pedal
travel is longer than
usual.GRisk of accident
The Recuperative Brake System is malfunctioning.
XObserve the additional display messages in the multifunction dis-
play (Ypage 277).
XObserve the information regarding indicator and warning lamps in
the instrument cluster (Ypage 315) .
254PLUG‑IN HYBRID operation
Driving and parking