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Start-Stop function
The combust ion engine is operated on ly as need-
ed . Gene rally, the combustion engine turns off
when the vehicle is stationary and the high volt-
age battery powers the electrical vehicle sys-
tems.
The purpose of automatica lly shutting the com-
bustion engine off in hybrid drive mode is to save
fuel. All of the important vehicle systems, such
as steering, brakes and the A/C system, continue
to rema in active. In some cases, systems may re-
qu ire the combustion eng ine to continue running
when the vehicle is stationary . When dr iving in
congested traffic for long periods of t ime, the
combustion engine will cycle on when the veh icle
is stat iona ry to keep the high voltage battery
charged.
Gliding
If the gas pedal is not pressed and the D posit ion
is selected, the combustion engine remains
turned off up to speeds of app roximately 99 mph
(160 km/h) . Driving conservat ively like th is can
reduce fuel c:on5umption .
Energy recovery (recuperation )
When braking, the electric motor will act as a
generator creating e lectr ic energy that is then
sto red in the high voltage battery. This a lso oc-
curs when the ve hicle is coasting or dr iving down-
hill. The combustion engine is automatica lly
turned off in this case.
Tips for Driving Efficiently with your Hybrid
Appl ies to vehicles: with hybr id drive
Driving situa-
Conditions
tions
- Shift into the D position .
Starting from a
- Release the brake pedal.
Hybrid
The vehicle is braked with the electric motor by
applying early and even pressure to the brakes
and using short pedal movements ~
page
98 ,
fig.
110 @ . By doing this, a large amount of the
kinetic energy is recovered and may be stored as
electric energy in the high voltage battery. Dur-
ing heavy brak ing, the conventional brakes are al-
so act ivated
~
page
98,
fig.
11 0 @ .
The energy recovery is shown in the MMI d isplay
~ page
104 .
Automatic start of the combustion engine
Various operating conditions cause the combus -
t ion eng ine to start automatically:
- The high voltage battery charge level is low.
- The temperatu re of the combustion engine is
low.
- The temperature
of the catalytic converter is
low.
- The power output needed for the A/C system is
high.
- The vehicle speed is high .
- The vehicle acceleration is high .
- The incline is steep .
- High charge level for the high voltage battery
when coasting. In this case, the high voltage
battery cannot absorb any more energy and so
the electric motor cannot slow down the veh i-
cle . The combust ion engine turns on (engine
brake). In th is situation the high voltage bat-
tery w ill show a Max charge.
Vehicle behavior
In the D posit ion, the hybrid system adapts
to the dr iving situat ion by automatically
stop
- Only press moderately on the ac-
switch ing between the combust ion engine
and e lectr ic dr ive types or by combining
celerator pedal.
them.
101
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