Struggling to understand Taycan regen brakes

[tylerdurden]

Hi, I know how to switch it on. It’s very very light IMHO with limits functionality. However, when regenerating the green bar shows on the speedo. All simple up to now

What I don’t fully understand is the relationship between disc braking and regeneration. On active cruise when the car slows and green bar shows. Does that mean it’s fully using regen?

when I depress the brake, the green bar shows. Is that regen braking or disc?

is there a way to know what system is being used to slow the car?

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[bsclywilly]

This graphic should explain. Basically you'll use full recuperation between 12kph to about 140kph unless you need more than 290kW of regen power. Hydraulic brakes get blended in starting from 12kph to 5kph, below which is fully hydraulic. Above 140kph, you're still able to get 290kW of regen braking power but because power=mass*accel*velocity, the hydraulic brakes need to assist at higher speeds to maintain the same braking torque (torque being proportional to acceleration).

source: https://newsroom.porsche.com/en/202...ke-force-distribution-recuperation-30953.html

 

[Hirschaj]

It’s always interesting to learn how things are done but don’t overthink it while you’re driving. The car does an amazing job of mixing recuperation and mechanical braking when you press the brake pedal. It just works. Porsche did a great job with the braking system on the Taycan.

 

[tylerdurden]

Very helpful. Thanks. So the green bar = recouperattion and not disc braking?

 

[W1NGE]

Hi, I know how to switch it on. It’s very very light IMHO with limits functionality. However, when regenerating the green bar shows on the speedo. All simple up to now

What I don’t fully understand is the relationship between disc braking and regeneration. On active cruise when the car slows and green bar shows. Does that mean it’s fully using regen?

when I depress the brake, the green bar shows. Is that regen braking or disc?

is there a way to know what system is being used to slow the car?

If you see a green bar at all it means recuperation is active and occuring (the display graphic has this written on it).

Brake recuperation is always available after a few short miles (conditions dependent).

The button on the wheel relates to overrun recuperation and only occurs when you take your foot off the accelerator and you will feel the car slow down. This has a manual and an auto setting as denoted by the icon when the button is pressed. Auto mode relies on tracking the car on front (I would avoid it).

Best recuperation is generated from braking and not overrun.

Coasting (no overrun enabled) is arguably more efficient.

Brake recuperation uses the electric motors to do most of the braking under normal conditions. Emergency braking and on first start up will use the discs.

Also display the Trip data in the central PCM screen and will see a graphic of where the power goes as you drive

Don't expect much recuperation overall and don't rely on it it add much range. Coasting is king for that in my experience.

 

[Jasper4S]

Very helpful. Thanks. So the green bar = recouperattion and not disc braking?

Exactly, blue means it costs power, green means it generates power.

 

[WuffvonTrips]

A good indication of how often the "physical" braking system gets called upon, is the notable quote in the article linked above by @bsclywilly-
"In the Taycan, 90 percent of all times the driver brakes in everyday situations, this can be done using electric power only"

 

[azraeil]

Taycan has brake by wire technology .... even if you're pressing the brakes, the computer is able to determine which ones to use and 90% of the time, it will use the motor instead of the hydraulics brakes.

 

[tylerdurden]

Brilliant. I feel much more informed of what the car is doing thanks

 

[W1NGE]

A good indication of how often the "physical" braking system gets called upon, is the notable quote in the article linked above by @bsclywilly-
"In the Taycan, 90 percent of all times the driver brakes in everyday situations, this can be done using electric power only"

In theory but your brake pads will tell a different story - in 2 years of my first Taycan ownership the pads were < 50% (no hard braking or emergency stops) after 18K miles.

 

[DexD]

If you see a green bar at all it means recuperation is active and occuring (the display graphic has this written on it).

Brake recuperation is always available after a few short miles (conditions dependent).

The button on the wheel relates to overrun recuperation and only occurs when you take your foot off the accelerator and you will feel the car slow down. This has a manual and an auto setting as denoted by the icon when the button is pressed. Auto mode relies on tracking the car on front (I would avoid it).

Best recuperation is generated from braking and not overrun.

Coasting (no overrun enabled) is arguably more efficient.

Brake recuperation uses the electric motors to do most of the braking under normal conditions. Emergency braking and on first start up will use the discs.

Also display the Trip data in the central PCM screen and will see a graphic of where the power goes as you drive

Don't expect much recuperation overall and don't rely on it it add much range. Coasting is king for that in my experience.

I disagree regarding Auto regen (which is activated by holding the regen steering wheel button down for a few seconds) - although I have active cruise control available, I use auto regen regularly and find it very intuitive. it controls relative speed and space to other vehicles very well, especially in heavy suburban/ urban driving

 

[Hirschaj]

I like using auto recoup on group drives with my local Porsche club. It’s helpful for keeping proper spacing.

 

[sufcrusher]

I disagree regarding Auto regen (which is activated by holding the regen steering wheel button down for a few seconds) - although I have active cruise control available, I use auto regen regularly and find it very intuitive. it controls relative speed and space to other vehicles very well, especially in heavy suburban/ urban driving

This: you get the coasting for better efficiency and smooth recuperation when you need to slow down because there's someone in front of you anyway.

Tip: An easier way to enable Auto (that doesn't require holding a button and taking your eyes off the road to check the dash to see when it comes on) and have it not switch back off whenever you change driving mode: Configure it to be enabled in the custom driving mode and then simply always change to that driving mode first. It will stay on when you later change to Sport Plus or any other.

 

[W1NGE]

I disagree regarding Auto regen (which is activated by holding the regen steering wheel button down for a few seconds) - although I have active cruise control available, I use auto regen regularly and find it very intuitive. it controls relative speed and space to other vehicles very well, especially in heavy suburban/ urban driving

My point is really that for regenerative purposes it's not that useful.

Simple to use and simple to be unreliable also.

I don't have ACC which is likely (is) doing more of the braking control and 100 times more reliable than Auto Regen.

 

[or1]

...
Coasting (no overrun enabled) is arguably more efficient.

...

The regen itself is equally efficient whatever way it is applied. What makes coasting more efficient is when it avoids some of the regen/deceleration and acceleration. Putting regenerated kinetic energy into the battery and later converting it into kinetic energy again with the motors is maybe 70 to 80 percent efficient, not 100 percent.

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