Do brake lights illuminate during auto-regen?

[allroadusa]

I guess not.

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[Jhenson29]

I don’t understand the love for auto regen, personally. It’s a weird in-between where the car is intervening, but not enough, so you still have to do something too. I’ve really never liked it at all.

Auto regen is kind of like LKA where it kind of tugs the wheel, but not enough to really steer the car for you. I keep that off too. It’s more annoying than helpful.

All that said, if it works for you and you like it, fine. But it’s not for me.

 

[simcity]

I think there in lies the rub.

So if you stick it in Auto-recup and hit traffic ahead. does it then mean brake lights activate on regen becoming active?

Whereas in ‘standard’ recup the brake lights remain off if regen is active. Which is what most of us have seen.

All bets are off if mechanical brakes blend esp. if you hit the deceleration thresholds set by Porsche to activate the brake lights.

 

[d00d]

Brake light activation is based on deceleration rate only, try ShiftyWolf's tape test and see for yourself.

 

[Hirschaj]

Does it brake any harder in Auto-regen versus normal regen with cars in front? Purely regen though - no blending

Yes, it can “brake” much harder than normal regen mode (which is at a fixed rate) assuming you’re coming into the cars in front of you at a high enough rate.

 

[simcity]

Yes, it can “brake” much harder than normal regen mode (which is at a fixed rate) assuming you’re coming into the cars in front of you at a high enough rate.

So it has to detect an upcoming vehicle to allow a deeper degree of recup/regen which presumably then reaches a deceleration level that triggers the brake lights?

…and you’re 100% confident that in this process there is absolutely no mechanical brake blending / assistance whatsoever?

 

[Hirschaj]

So it has to detect an upcoming vehicle to allow a deeper degree of recup/regen which presumably then reaches a deceleration level that triggers the brake lights?

…and you’re 100% confident that in this process there is absolutely no mechanical brake blending / assistance whatsoever?

Yes, that is what makes it “auto”. And yes, I’m confident there is no mechanical braking involved in auto-recup mode.

 

[simcity]

Thanks @Hirschaj

So to summarise:

1. Ordinary recup mode, no brake lights as deceleration is not sufficient to cross the brake lights on threshold

2. Auto-recup mode, if car detects upcoming vehicle will regen more intensively, thus triggering the deceleration threshold, which will activate the brake lights

Correct?

 

[Hirschaj]

Thanks @Hirschaj

So to summarise:

1. Ordinary recup mode, no brake lights as deceleration is not sufficient to cross the brake lights on threshold

2. Auto-recup mode, if car detects upcoming vehicle will regen more intensively, thus triggering the deceleration threshold, which will activate the brake lights

Correct?

Yes! ?

 

[Perry]

Don’t forget that even if you press the brake pedal it won’t engage the mechanical brakes until needed, but it obviously turns on the brake lights either way.

Nevertheless, I'm not entirely sure why it actually matters what physical method of braking the car uses. If the car brakes, it brakes. Whether it's through regen or disks is essentially a technicality.

That said, the actual answer is that all cars sold in the EU are legally required to activate the brake lights at deceleration from regen (or other systems) of over 1.3 m/s².

https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:42023X0401

Technically, Porsche can of course use a different implementation in other markets, though.

So to summarise, the brake lights will turn on when:

1. Driver presses the brake pedal.
2. Any system (auto regen, TACC, e.t.c) decelerates the car over 1.3m/s² through any means (regen, disks or any combination of the two) for the purpose of slowing down the car.

They will not turn on if:

1. The car decelerates less than 1.3m/s² (e.g. regular regen).
2. Deceleration is not directly caused by a system (e.g. rolling resistance, driving up a slope, e.t.c).
3. The main purpose of the system is not to slow down the car (e.g. slight braking to clean the disks).

 

[WuffvonTrips]

Don’t forget that even if you press the brake pedal it won’t engage the mechanical brakes until needed, but it obviously turns on the brake lights either way.

Nevertheless, I'm not entirely sure why it actually matters what physical method of braking the car uses. If the car brakes, it brakes. Whether it's through regen or disks is essentially a technicality.

That said, the actual answer is that all cars sold in the EU are legally required to activate the brake lights at deceleration from regen (or other systems) of over 1.3 m/s².

https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:42023X0401

Technically, Porsche can of course use a different implementation in other markets, though.

So to summarise, the brake lights will turn on when:

1. Driver presses the brake pedal.
2. Any system (auto regen, TACC, e.t.c) decelerates the car over 1.3m/s² through any means (regen, disks or any combination of the two) for the purpose of slowing down the car.

They will not turn on if:

1. The car decelerates less than 1.3m/s² (e.g. regular regen).
2. Deceleration is not directly caused by a system (e.g. rolling resistance, driving up a slope, e.t.c).
3. The main purpose of the system is not to slow down the car (e.g. slight braking to clean the disks).

That's a significant change from this version of the regs we discussed in a thread around 12 months ago-

...both in terms of deleting the optional lighting between 0.7 and 1.3 m/s^2, and also now optionally allowing the persistence of the lighting once the rate of deceleration has dropped below the threshold while the braking demand persists.

 

[WasserGKuehlt]

Brake light activation is based on deceleration rate only, try ShiftyWolf's tape test and see for yourself.

Partially true; the brake lights will turn on if the brake pedal is engaged - irrespective of speed, deceleration, mode, distance traveled, or anything else. In the context of “no driver intervention”, the above is true.

 

[4thPcar]

I spent the past two years wondering about this but was afraid to post for fear I'd look like an idiot. I'm feeling exonerated now!

 

[d00d]

Right, it's understood we're talking about regen.
Without that context, the sentence would be `regen brake light activation is based on deceleration rate only'.

 

[4thPcar]

I don’t understand the love for auto regen, personally. It’s a weird in-between where the car is intervening, but not enough, so you still have to do something too. I’ve really never liked it at all.

Auto regen is kind of like LKA where it kind of tugs the wheel, but not enough to really steer the car for you. I keep that off too. It’s more annoying than helpful.

All that said, if it works for you and you like it, fine. But it’s not for me.

When I had my 911S I'd often downshift when approaching traffic to slow the car. I was told this may not be good for the engine but it became a reflexive motion for me after a decade of driving the same car. The auto-regen has a similar feeling when it kicks in. I'm addicted to it.

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