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Hybrid
Start-Stop function
The combust ion engine is operated on ly as need-
ed. Generally, 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 remain 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 traff ic for long per iods of t ime, the
combustion eng ine will cycle on when the veh icle
is stationary 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 approximately 99 mph
(160 km/h) . Driving conservative ly like th is can
reduce fuel con5umption.
Energy recovery (recuperation)
When braking, the electric motor will act as a
generator creating electr ic energy that is then
sto red in the high voltage battery. This also oc-
curs when the vehicle is coasting or dr iving down-
hill. The combustion engine is automat ically
turned off in this case.
Tips for Driving Efficiently with your Hybrid
Appl ies to: vehicles with hybrid d rive
Driving situa-
Conditions
tions
- Shift into the D position .
Starting from a
- Release the brake pedal.
The vehicle is braked with the electric motor by
applying early and even pressure to the brakes
and using short pedal movements
¢
page
101,
fig.
116 @ . By doing this, a large amount of the
kinet ic 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
101,
fig .
116 @ .
The energy recovery is shown in the MMI display
¢ page
107 .
Automatic start of the combustion engine
Various operating conditions cause the combus -
tion eng ine to start automatically:
- The high voltage battery charge level is low.
- The temperature 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-
t ery w ill show a Max charge.
Vehicle behavior
In the D posit ion, the hybrid system adapts
to the driving situat ion by automatically
stop
- Only press moderately on the ac-
switch ing between the combust ion engine
and electr ic drive types or by combining
celerator pedal.
them.
104
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