So driving in "S" sport mode in the e-tron automatically puts the car in "Hold battery" mode and with strong regeneration. If fact, one pedal driving is possible if you time it right. My question is when the car slows down during the regeneration (not pressing break pedal), do the break lights come on?
Break lights during regeneration
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andymccrory
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I asked the same question when I got my first electric car three years ago, a Chevy Volt. The brake lights don't come on in the Chevy and I don't think they come on in the A3 either. At least in Europe, there is no requirement for them to do so anyway.
Therefore I am very careful where I use heavy regenerative braking.
In crawling traffic it is useful as you don't need to keep hunting the pedals.
In motorway driving it is useful to slow slightly without brake lights to avoid the concertina affect behind you, you would hit the brakes in an emergency anyway.
In regular driving conditions I think it's best to avoid regenerative braking and use to pedal to light up and warn following trafic that you are slowing.
In any case if you brake gently, the lights go on but the mechanical brakes don't get applied until they are needed, i.e. you need to slow more than regenerative braking will do. So you still get the regenerative benefit however you brake other than an emergency stop.
I hope this helps.
Andy
Therefore I am very careful where I use heavy regenerative braking.
In crawling traffic it is useful as you don't need to keep hunting the pedals.
In motorway driving it is useful to slow slightly without brake lights to avoid the concertina affect behind you, you would hit the brakes in an emergency anyway.
In regular driving conditions I think it's best to avoid regenerative braking and use to pedal to light up and warn following trafic that you are slowing.
In any case if you brake gently, the lights go on but the mechanical brakes don't get applied until they are needed, i.e. you need to slow more than regenerative braking will do. So you still get the regenerative benefit however you brake other than an emergency stop.
I hope this helps.
Andy
Back in July 2014, I asked the German Audi engineers a similar question. They attempted to explain to me how it was achieved using a third clutch, I guess between the electric motor and the ICE. I'll see if I can find any diagrams on ElsaWin which might explain things.
[Edit] This is probably the best diagram I can find in the short term. It clearly shows the third clutch. http://insideevs.com/audi-a3-e-tron-detailed-specs/
[Edit] This is probably the best diagram I can find in the short term. It clearly shows the third clutch. http://insideevs.com/audi-a3-e-tron-detailed-specs/
I found this from a US Jetta Hydrid press release:
That offer some clarification regarding the third clutch between the ICE and the DSG.
Also here https://www.researchgate.net/public...l_Clutch_Transmission-Based_Electric_Vehicles
I found some research wich suggest that a good range of rpms can be used to generate power with a variable efficiency.
My neophyte curiosity is fulfilled!
That offer some clarification regarding the third clutch between the ICE and the DSG.
Also here https://www.researchgate.net/public...l_Clutch_Transmission-Based_Electric_Vehicles
I found some research wich suggest that a good range of rpms can be used to generate power with a variable efficiency.
My neophyte curiosity is fulfilled!
DISREGARD THE E-MAIL POST FROM AUDI. We tested it tonight. The break lights come on when you put it on "Sport" mode, and you let go of the accelerator/gas pedal and the car goes into regeneration/recuperation without touching the break pedal at all. Who ever is following an e-tron must go nuts wondering why the guy driving a wagon keeps hitting his break pedal :lol: :lol: :lol:
Little off topic, but the Hyundai Sonata hybrid has a similar setup and it actually downshifts through the gears as you brake and slow down to keep the motor speed up and give nice, strong regen. It must be a hell of a software challenge to keep the braking force constant through all that, but they seem to have pulled it off perfectly. I'm assuming that Audi does the same, but who knows.
Dominic":9x7x23lu said:
Current regulation doesn't actually preclude illuminating the brake lights during strong regen, but neither does it require it. At the moment, each manufacturer makes the choice. The decel effect of regen isn't much different than downshifting in a manual trans car, of course, but I expect that as with requiring added noise to plug-in cars, regulation will evolve to require brake lights illuminate at a certain regen threshold.
bruintoo":1n30tn38 said:
My daughter was following me the other day and I called her in the car to ask about this issue. I can confirm that putting the car in manual mode and taking your foot off the accelerator does not turn on the brake lights. We didn't test Sport mode.