When slowing down the vehicle, and when the vehicle is rolling in overrun or driving downhill, electrical energy is created by the electric drivetrain and stored in the high-voltage battery. The electric drivetrain hereby works as a generator and creates an engine braking effect. This process is called "brake energy recuperation".
Engine braking varies depending on the selector lever position.
The vehicle brake light may light up when the brake energy recuperation is intense. The brake energy recuperation, and therefore also the engine braking effect, decreases as the charge level of the high-voltage battery increases. If the high-voltage battery is completely charged, there is no brake energy recuperation and no electric motor braking effect. If the vehicle detects that the road conditions do not permit safe contact between the wheels and the road, the energy recuperation, and therefore also the engine braking, is automatically reduced. The power display gives information about the available energy recuperation and the engine braking.
Depending on the selector lever position and the settings of ECO assist (→ Eco
assist) , the vehicle will recuperate at
different level:
Selector lever position
engaged
and ECO assist deactivated: No energy recuperation.
Selector lever position
engaged
and ECO assist activated: Automatic energy recuperation. The level of
recuperation
is automatically chosen depending on the navigation data and traffic
situation.
Selector lever position
engaged:
Intense energy recuperation.
The vehicle still recuperates energy if the brake pedal is pressed.
Driving on an incline
On inclines, it is best to drive in the gear where possible.
Never let the vehicle roll down mountains or hills in the
neutral setting.
WARNING
Strong recuperation can cause traction loss and sliding, especially on slippery roads. This could cause loss of vehicle control, accidents and serious or fatal injuries.
WARNING
As the charge level of the high-voltage battery increases, the electric motor braking effect decreases and can completely disappear. The driving behavior may therefore change, which can cause accidents and serious or fatal injuries.
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