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  • CLA
  • Shooting Brake
  • 09/2021
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Function of the recuperative brake system

This function is only available for a plug-in hybrid.

Depending on the selected recuperation level, the electric motor is operated as an alternator when in overrun mode and during braking in order to charge the high-voltage battery while driving. As soon as you release the accelerator pedal when the vehicle is in motion, recuperation in overrun mode is initiated.

The higher the recuperation, the more sharply the vehicle is braked when coasting and the more electrical energy is fed into the high-voltage battery.

The regenerative brake system has the following characteristics:
  • supports braking with electronically controlled brake force boosting

  • converts the kinetic energy of the vehicle into electric energy

If you brake hard, the mechanical brake is also used. This means that the maximum recuperative energy cannot be recovered. The more you drive and brake in an anticipatory manner, the more efficiently energy can be recuperated.

System limits
The braking effect of the electric motor during recuperation in overrun mode may be reduced or may not be available at all in the following situations:
  • when the high-voltage battery charge level increases

  • if the high-voltage battery is not yet at a normal operating temperature

  • when driving at speeds close to zero

  • in transmission position

  • during and after ESP® intervenes

In these cases, the desired deceleration is set by the brake control system. Also brake with the service brake if necessary.