Audi energy recuperation
Discussion
The Alternator charges some additional cells in the battery. If you switch on anything electrical that creates extra drag on the charging system (electrical power is not FOC just cause the engine is running) even using a heated rear windscreen will effect fuel consumption. It makes sense to recoup some of the overrun energy to suppliment this power loss.
Edited by chard on Monday 16th November 14:41
The point is the Audi alternator generates more power to recharge the battery on OVER-RUN so using some "free" energy. and less drag on the engine under power.
Just one feature on it's own isnt going to save the world but does help reduce emissions.
Combine this with other features and developments and you can make impovements.
i.e. at home a low wattage light bulb does not make much differance, but lag the HW tank, install cavity wall insulation etc etc and you will see improvements.
Just one feature on it's own isnt going to save the world but does help reduce emissions.
Combine this with other features and developments and you can make impovements.
i.e. at home a low wattage light bulb does not make much differance, but lag the HW tank, install cavity wall insulation etc etc and you will see improvements.
chard said:
The point is the Audi alternator generates more power to recharge the battery on OVER-RUN so using some "free" energy. and less drag on the engine under power.
I think the point is that a few miles after starting a car the battery should be pretty much fully charged anyway...What I think is going on here is that the starter motor is now in line with the gearbox where the flywheel usually is because it's one of those start/stop mild hybrids. Under braking it's used as a generator, much like the KERS in F1. But with the bonus that the Quattro AWD system will let the car's electronics balance out the braking force to feel more like the normal brakes.
Nothing special really, any company that makes a "mild hybrid" has exactly the same thing but doesn't make such a song and dance about it.
Nothing special really, any company that makes a "mild hybrid" has exactly the same thing but doesn't make such a song and dance about it.
100SRV said:
Is the Audi recuperation system using an electromagnetic clutch to decouple the alternator rotor when the engine is driving and recouple it on the overrun?
Probably not.All you have to do to an alternator to get no output is disconnect the field winding, very easily done by linking the regulator to an ECU since the regulator already exists in every alternator, and works by managing current through the field winding. Less field current = less magnetism in the rotor = less output. And the amount of energy required to turn-over an non-generating alternator is essentially zero, it's just an idler on the accessory drive belt.
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