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      01-26-2011, 12:42 AM   #1
LANDLORD
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Brake Energy Regeneration is something new. I now understand how it works!

Gathered from various BMW articles:

Power from your brake pedal.
With Brake Energy Regeneration, BMW EfficientDynamics points the way to a more energy-efficient future. As soon as you brake or take your foot off the accelerator, the kinetic energy is captured and fed to the battery. This reduces the amount of power the battery takes from the engine and hence lowers fuel consumption. When the driver presses the accelerator, on the other hand, the alternator is decoupled from the drivetrain. With fewer components drawing power from the drivetrain, more of the engine's output can go into accelerating the car.

Brake Energy Regeneration.Make use of every Watt: by charging the battery only when your BMW is braking, coasting or decelerating, Brake Energy Regeneration improves fuel efficiency by up to three percent and ensures that the full power of your engine is available for acceleration.

Today's vehicles require much more electrical energy than older models, due to the much wider array of electric and electronic on-board comfort and safety systems. This energy is created by the generator (also known as the alternator) which converts the engine's power output into electricity. In conventional systems, the generator is permanently driven by a belt connected to the engine.
BMW's Brake Energy Regeneration operates differently: the generator is activated only when you take your foot from the accelerator or apply the brake. The kinetic energy that would otherwise go to waste is now used efficiently, converted into electricity by the generator and stored in the battery.
Producing electricity in this highly efficient way delivers an additional advantage: when you apply the accelerator, the generator is deactivated - so the full power of the engine can be directed to the drive wheels. Brake Energy Regeneration thus increases fuel efficiency while simultaneously enhancing driving dynamics. As a safety precaution, the Brake Energy Regeneration system monitors the level of battery charge and will, if necessary, continue to charge the battery even during acceleration to prevent a complete discharging of the battery.

It incorporates a special deep-cycle Glass Mat battery with programmed alternator disengagement so that, most of the time, the vehicle's battery is only charged while the vehicle is coasting or braking. Over time, the Brake Energy Regeneration system can save 1-2% on fuel consumption. Brake Energy Regeneration is another feature in BMW's EfficientDynamics portfolio of small features and adjustments which have a cumulative effect on the efficiency-performance balance of each BMW vehicle.

This is interesting technology. One thing I will now keep in mind is that the battery is slightly different and will need to be replaced accordingly.
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      01-26-2011, 12:51 PM   #2
1230vani
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THis was an interesting read. I like how the brake reg energy is displayed in the new x3 (with navi pro).
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      01-26-2011, 01:13 PM   #3
dmlgc
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What's a brake ?
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      01-30-2011, 11:32 AM   #4
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Gimme a brake!
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