Regen Issues when Cold

[rs38]

This is not quite what I have experienced. Because of this thread I did a little test. Taking the car out in the morning, the air temperature was about -10C. Using the center console display, I did a number of stops at various speeds. In every case there was no indication of regen on the display until the speed reached was above about 8 kph. It appeared that it was speed and not time or km driven that determined when regen was available.

that regen pause ocurring every day is completly independent of temperatur!
It waits that you apply a certain amount of break energy (~1MJ) to the disks. This can happen in one heavy breaking or many tiny, or even happen after 30 minutes when you virtually did not use the break. Keep in mind: Break energy is increased with speed^2!!
And it's only brake regen. You get lift-off regen from the 1st second of in sport mode btw.

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[kwrudy123]

I live in a warm climate and I also don't charge to greater than 85% most times. But regardless of temperature or SOC, the first few times I apply the brakes at the first drive of the day, I get no regen from braking. However, I turned on the regen during coasting using the button on the steering wheel as soon as I left the garage and the car did modest regen while coasting, but not while braking until a few minutes later in my drive. Therefore, I suspect it has to do with warming up the brakes first before starting braking regen, but I can’t be certain. BTW, this wasn't occurring when I first purchased the car, but after a couple of months of ownership, so I bet it was an OTA update that incorporated this change.

Like other posters on this thread, I wonder why there wasn't any warning from Porsche about this change, as it certainly is a different braking experience without the regen than with it and it could potentially be dangerous if you aren't expecting the extra pressure needed on the brake peddle at the first few stops.

 

[DerekS]

Braking regen is off for the first few stops of each day.

It's in the manual on page 67.

"To assist in cleaning the brakes, the recuperation system is deactivated for a short time after standstill times of more than 6 hours. The recuperation system is activated again automatically afterwards."

 

[W1NGE]

that regen pause ocurring every day is completly independent of temperatur!
It waits that you apply a certain amount of break energy (~1MJ) to the disks. This can happen in one heavy breaking or many tiny, or even happen after 30 minutes when you virtually did not use the break. Keep in mind: Break energy is increased with speed^2!!
And it's only brake regen. You get lift-off regen from the 1st second of in sport mode btw.

Actually its called recuperation and not regeneration (sorry).

Lift off / overrun recuperation is less efficient than braking recuperation.

 

[kwrudy123]

Braking regen is off for the first few stops of each day.

It's in the manual on page 67.

"To assist in cleaning the brakes, the recuperation system is deactivated for a short time after standstill times of more than 6 hours. The recuperation system is activated again automatically afterwards."

Thanks! I hadn’t looked for it in there simply because I never noticed this occurring before about a month ago and this is my 3rd Taycan. So I assumed it was a recent OTA.

 

[QueenBean]

This is one of the reasons why pre-conditioning is important prior to both departure for range, performance, and regenerative braking as well as prior to DC Fast Charging for a high charge rate.

 

[QueenBean]

Actually its called recuperation and not regeneration (sorry).

Lift off / overrun recuperation is less efficient than braking recuperation.

Porsche (probably most Germans) may call it "recuperation," however, it is conceptually identical to regenerative braking.

 

[Fish Fingers]

Thanks! I hadn’t looked for it in there simply because I never noticed this occurring before about a month ago and this is my 3rd Taycan. So I assumed it was a recent OTA.

Its also in the Good to know app.

I think its been in there at least since I got my car (Aug 2021).

I also mentioned it in another thread and was told I was wrong, but here it is....

 

[rs38]

Actually its called recuperation and not regeneration (sorry).

Lift off / overrun recuperation is less efficient than braking recuperation.

it all means the same: energy recuperation, regeneration, recovery. Even Porsche cannot decide

and of course recu/regen on the brake pedal (before blended-in friction is used) is the same as by sport mode or auto/radar recu/regen.

 

[rs38]

that regen pause ocurring every day is completly independent of temperatur!
It waits that you apply a certain amount of break energy (~1MJ) to the disks.

BTW: meanwhile we know it's 500kJ spend for the daily disc friction

 

[W1NGE]

it all means the same: energy recuperation, regeneration, recovery. Even Porsche cannot decide

and of course recu/regen on the brake pedal (before blended-in friction is used) is the same as by sport mode or auto/radar recu/regen.

Tomato tamato

 

[Jhenson29]

To me…

Recup is recovering energy (e.g. putting it back into the battery).

Regen is negative torque at the motor (i.e. the rotor is driven by an external force).

In the context of the car, the motor goes into regen for braking and puts the energy into the battery, hence the recup.

The Taycan has no method of regen without recup (that I’m aware of). As a result, I typically use the terms interchangeably (for the car) unless I have a need to specify. But you can (in general) have regen without recup by dissipating the energy as heat (e.g. over braking resistors) in which case it’s not recovered (hence, no recup).

I’ve never heard “recup” if the energy is dissipated as heat. The terminology is always just that the motor is in regen.

 

[Fsudoles]

Ironically, dropped mine at the dealer today….for weeks, after several miles of driving, in sport or in normal mode, warm to hot weather, it will eventually throw the “Adaptive Recuperation Not Available” error message and it will stop any type of recuperation action. It happens at regular speeds, low speeds, and it happens quite frequently over speed bumps and railroad tracks….it’s all bizarre. After a few seconds, I can reset it to “Auto” and it’s fine, until it isn’t. Anyhow, they think it might be a dirty sensor, but we shall see. I’ve never had an issue with “Regular Recuperation”….only “Auto”. We shall see….it’s weird being in the loaner Macan….it’s even stranger knowing I’m going to have to fill it back up before I return it, not looking forward to that…hopefully it’s only a day or two.

2022 RWD
Delivery Date-4/10/2022
Odometer today-705 Miles

 

[Windpower]

To me…

Recup is recovering energy (e.g. putting it back into the battery).

Regen is negative torque at the motor (i.e. the rotor is driven by an external force).

In the context of the car, the motor goes into regen for braking and puts the energy into the battery, hence the recup.

The Taycan has no method of regen without recup (that I’m aware of). As a result, I typically use the terms interchangeably (for the car) unless I have a need to specify. But you can (in general) have regen without recup by dissipating the energy as heat (e.g. over braking resistors) in which case it’s not recovered (hence, no recup).

I’ve never heard “recup” if the energy is dissipated as heat. The terminology is always just that the motor is in regen.

Maybe regen, used by Tesla, is not the best word to describe what is happening.

Both recoup and regen use the momentum of an electric car to 'refill' the high voltage battery when the car is slowing down. Regen and recoup describe the same thing: when an electric car slows down, the electric motor is used to generate power which is then used to refill the battery.

 

[Jhenson29]

Maybe regen, used by Tesla, is not the best word to describe what is happening.

Both recoup and regen use the momentum of an electric car to 'refill' the high voltage battery when the car is slowing down. Regen and recoup describe the same thing: when an electric car slows down, the electric motor is used to generate power which is then used to refill the battery.

But regen is used in isolation in other applications to describe negative torque at the motor with no recovery of energy (it’s just dissipated as heat).

What Tesla and the Taycan do is the same thing (recup). They just have different magnitudes and input methods.

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