Mercedes-Benz GLC Owner's Manual page 302

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
there is a malfunction in the hybrid drive
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system
the climate control of the vehicle requires it
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the high-voltage battery is being charged
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( page 292)
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automatic emissions tests are running
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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 M
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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
In overrun mode, the combustion engine is
switched off and is disconnected from the
drive train. The electric motor:
generates low thrust, which corresponds to
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the overrun mode of an active combustion
engine
functions as an alternator and produces the
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necessary energy for the auxiliary consum-
ers and charges the high-voltage battery
Overrun mode is available in drive program E
below 160 km/h.
In drive program E, after the accelerator pedal
has been released the coasting characteris-
tics of the vehicle are adapted to the traffic
conditions. Further information about the
haptic accelerator pedal ( page 297).
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PLUG‑IN HYBRID operation
Route-based energy management
For route-based energy management, the
system factors in information about the
expected route when route guidance is
active.
The information on the route is provided by
COMAND Online and includes the following:
road categories
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speed limitations
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data on downhill gradients
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The use of electric energy is automatically
optimally distributed from the beginning to
the end of the journey, using information
about the route. The distribution is pre-emp-
tive and takes into consideration:
the sections of the journey ahead
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the energy consumption on the whole route
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The charge status of the high-voltage battery
is thus systematically controlled. In addition,
the control function takes into account that:
the fuel savings through the use of electri-
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cal energy can vary, depending on the route
(e.g. urban, interurban or motorway)
the use of electrical energy is held available
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in particular for electric operation (e.g.
urban routes)
The vehicle thus automatically selects the
optimum driving mode for the respective sec-
tion of the route.
Route-based energy management is available
under the following conditions:
drive program E is selected
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HYBRID driving mode is selected
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active route guidance is activated
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suitable map data is available
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When route-based energy management is in
operation, the area in front of the vehicle is
shown as green in the multifunction display.
299
Z