Mercedes-Benz C-Class 2014 Owner's Manual page 283

Hybrid operation
280
Automatic engine switch-off
The internal combustion engine is switched
off automatically if:
the driver removes his foot from the accel-
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erator pedal and a speed of 160 km/h is
not exceeded (
the combustion engine and the transmis-
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sion have reached operating temperature
the driver's seat belt is fastened and the
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driver's door is closed
the driver only slightly depresses the accel-
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erator pedal in order to, for example, main-
tain the current speed for a limited distance
the bonnet is closed and engaged properly
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the high-voltage battery is charged suffi-
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ciently
there are no faults in the hybrid system
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The internal combustion engine will not be
switched off automatically, if:
the self-diagnosis function of the engine
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control unit is still active
the climate control of the vehicle requires it
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the high-voltage battery is being charged
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( page 274)
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automatic emissions tests are running
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the operating temperature of the engine,
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transmission and catalytic converter has
not yet been reached
Automatic engine start
The internal combustion engine, which has
been automatically switched-off, starts auto-
matically in certain situations, when:
the power demand from the driver via the
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accelerator pedal is greater than the elec-
tric motor alone can provide
the driver switches to drive program S or S
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+
the driver has activated manual gearshift-
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ing
page 280)
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the charge level of the high-voltage battery
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has reached the lower limit
the settings of the automatic climate con-
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trol require it, e.g. at external temperatures
above 30 †
Overrun mode
This operating mode is available in the speed
range below 160 km/h.
The combustion engine is switched off and is
disconnected from the drive train.
The electric motor:
simulates an overrun torque which is equiv-
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alent to the overrun torque of the combus-
tion engine
functions as a generator and produces the
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necessary energy for the auxiliary consum-
ers and charges the high-voltage battery
Extended overrun mode
Overrun mode allows you to increase the
vehicle range.
When the vehicle is in overrun operating
mode:
Pull the right-hand steering wheel gearshift
X
paddle.
Energy recuperation is reduced to the min-
imal amount of energy required. The vehi-
cle rolls faster and further, e.g. on long and
steep downhill gradients or while coasting
towards a set of traffic lights.
You can see the reduction in energy recuper-
ation in the electric motor CHARGE display
( page 272).
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The "extended overrun" operating mode is
deactivated again if:
the combustion engine starts
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you depress the brake pedal
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