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      05-06-2014, 05:11 AM   #1
x5love
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Why does the dash pretend it's a hybrid?

I was driving a new 7 in eco pro yesterday and was so confused by the "charge" function in the dash. When applying the breaks, the car tells me it's charging as if it's a hybrid... but it's not.

Is it trying to tell me that it's using braking to recharge the battery? If so, does this actually have a substantial impact on fuel economy? I can't imagine the benefits are that extreme considering the battery doesn't power the motor.
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      05-08-2014, 07:47 AM   #2
lat297
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It has nothing to do with hybrid technology.

Like the 730d and indeed all Efficient Dynamics models, it uses regenerative braking. This means that it delivers full power when accelerating and charges the car's battery only when braking or going downhill (when not accelerating).

Apparently this can deliver 3% boost in energy efficiency, which can all add up!

Luke
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      05-08-2014, 09:34 AM   #3
luvthestck
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Quote:
Originally Posted by lat297 View Post
It has nothing to do with hybrid technology.

Like the 730d and indeed all Efficient Dynamics models, it uses regenerative braking. This means that it delivers full power when accelerating and charges the car's battery only when braking or going downhill (when not accelerating).

Apparently this can deliver 3% boost in energy efficiency, which can all add up!

Luke
+1.I think usually in the absence of that, your alternator might have to work extra to recharge the cars battery.Extra work by alternator puts a little load on the engine which eats into your gas.
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      05-14-2014, 04:55 PM   #4
jgbackes
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Like the other current BMW Group models, the F01/F02 uses an energy management system to ensure balanced use of energy on the vehicle.

In addition to the main functions of basic power management (idling speed and required battery charge voltage), APM also incorporates the following extended functions:
  • Electric load reduction
  • Electric load shut-down
  • Vehicle systems diagnosis
  • Battery diagosis

Basically the system doesn't run the alternator 100% of the time like cars used to do. When the car is coasting a clutch in the alternator engages and the alternator is used to charge the battery.

Most of the time you are draining the battery to run electrical equipment like radios and fans and the alternator is freewheeling. Only when the battery is low is the battery replenished.

As far as I can tell there is no regenerative braking like in a hybrid, it's just the cycling of the alternator.

jeff

Source: 03.3_F01 Energy Management.pdf
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