Recuperative Brake System

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The radar-assisted recuperative braking system ensures effective energy recovery by adjusting the recuperation intensity to suit the prevailing driving situation. 

Recuperation converts kinetic energy during deceleration into electrical energy and thus increases the range of the vehicle. To do this, the radar-assisted recuperative braking system uses data from certain assistance systems and supports the drive by regulating the vehicle speed and its distance to other vehicles.

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More detailed information

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Recuperation is the recovery of energy during vehicle deceleration phases. The basis for this process is an asynchronous motor which can be used either as a motor or as a generator.

 

In overrun mode (deceleration phase which occurs when the accelerator pedal is released) and during braking, electrical energy is recovered and used to charge the vehicle's high-voltage battery. The radar-assisted recuperative braking system regulates energy recovery in a particularly effective way by automatically increasing the length and intensity of recuperation phases or by switching to the energy-saving gliding mode, as the driving situation dictates. At the same time, the driver is relieved of the task of regulating distance and speed.

If the radar sensors of Active Brake Assist detect a slow-moving vehicle in front or a vehicle which is decelerating, the radar-assisted recuperative braking system increases the recuperating torque in order to reduce the vehicle speed. If no vehicle is detected, or a distant or accelerating vehicle is detected, the vehicle switches to the energy-saving gliding mode without recuperation. This is particularly useful for city driving and gently sloping expressways. Contrary to an automatic distance-regulating system, the vehicle is not actively accelerated and the distance is only maintained to a limited degree; the system only functions when the driver does not operate the accelerator or brake pedal.

When driving downhill on steep gradients, an increase in recuperation limits the acceleration. This effect is similar to that of downshifting.

If Traffic Sign Assist detects a speed limit, the system increases the recuperating torque to slow down the vehicle accordingly.

If the driver wishes to control the intensity of recuperation manually, the steering wheel gearshift paddles can be used to change to manual mode. In this mode, there are four recuperation stages available, from gliding to high recuperation rates with a sporty accelerator pedal characteristic curve:

  • D+ (gliding, no recuperation)
  • D (moderate recuperation)
  • D- (high recuperation)
  • DAuto (recuperation dependent on the traffic situation)

 

Briefly pulling on the left or right-hand steering wheel gearshift paddle allows the driver to increase or reduce the level of recuperation. The selected level is shown in the multifunction display. Pulling one of the steering wheel gearshift paddles for a prolonged period of time allows the driver to switch back into the radar-assisted recuperation mode (DAuto). For comfort reasons, the intensity of the recuperation is limited to a certain upper limit.

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Availability of vehicles

  • A-Class
  • AMG GT
  • B-Class
  • C-Class
  • CLA
  • CLS
  • E-Class
  • G-Class
  • GLA
  • GLC
  • GLE
  • GLS
  • S-Class
  • SL
  • SLC
  • V-Class

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