Part 3: The Quest for the Perfect Tune

[prj]

Ah this is a welcome change. When holding the pedal steady and switching the drive mode dial from Sport -> Sport Plus, it currently feels like a downshift + throttle blip on an ICE car.

That's normal. It's not due to regen.
What I had is that because of the 4x higher regen if you switched it during driving the car started either accelerating or decelerating (as the pedal was now being regen blended).

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[mystermykee]

.....as a lot of people want the single pedal driving feel.

 

[mystermykee]

20 software revisions later I got it working quite well.

Regen increased by 400%.
Extended the pedal overrun range. From factory the regen comes in basically in the last 1-2% of travel, there is now 20% of pedal to play with on the Turbo S, on the less powerful cars there will be even more adjustment.

Recalibrated the torque filter/damper so that the regen torque coming in does not feel abrupt even if you just release the pedal.

Fixed the way the switchover works when changing modes, so the car does not start accelerating or braking by itself when toggling the regen while driving in a straight line and holding the pedal steady.

Right now I am able to single pedal drive normal city driving situations (metric, LHD) - slowing down for a turn, going through a 30km/h zone where you have to yield to right hand traffic. Braking for speed bumps.
Adding any more regen it's IMO too much, and when you lift out completely it becomes nauseating.

Ported all the changes to J1.2 also.
Next steps are testing with some customers and collecting feedback and opinions.

Will the brake lights come on if regen surpasses the deceleration threshold of around .3g?

 

[prj]

Will the brake lights come on if the regen surpasses the deceleration threshold of around .3g?

I am sure they will, because they come on in auto.

 

[mystermykee]

I am sure they will, because they come on in auto.

Interesting, I never realized they did on the Taycan. Thanks!

 

[frietzak]

Does it affect range? I would be willing to try it.

 

[prj]

Does it affect range? I would be willing to try it.

No it does not affect range, especially since it's toggleable.
I don't know how well it will behave on a RWD, needs testing.

We can do it if you want, can always go back to what it was before.

 

[prj]

Borrowed a Model 3 today, tested the regen back to back.
Slightly modified the calibration further to give stronger regen at low speeds without feeling jarring.

Let the Model 3 owner drive it, he liked the regen more than the Tesla - he said it is much smoother and easier to drive.
Mission complete I think

Of course the car still won't come to a complete stop and creeps (same like if you enable creep on Tesla), but I think this is not the most important thing.

 

[Zcd1]

Borrowed a Model 3 today, tested the regen back to back.
Slightly modified the calibration further to give stronger regen at low speeds without feeling jarring.

Let the Model 3 owner drive it, he liked the regen more than the Tesla - he said it is much smoother and easier to drive.
Mission complete I think

Of course the car still won't come to a complete stop and creeps (same like if you enable creep on Tesla), but I think this is not the most important thing.

As a long-time Tesla driver who also owns another EV, the other EV's inability to one-pedal drive to a smooth stop is my number one complaint about it.

IMHO, if possible, you should offer the option to regen to a stop.

 

[prj]

As a long-time Tesla driver who also owns another EV, the other EV's inability to one-pedal drive to a smooth stop is my number one complaint about it.

IMHO, if possible, you should offer the option to regen to a stop.

It's not possible because there is no ABS integration to apply the brakes. Having the car standing without the brakes applied is very dangerous.

 

[Zcd1]

It's not possible because there is no ABS integration to apply the brakes. Having the car standing without the brakes applied is very dangerous.

How does Tesla accomplish this?

 

[fika]

I know within the VAG group it's a meme to crap on one pedal driving, but giving us the option would be nice. I drive my car a lot, and I'm not always on open highways where coasting is the best option. OPD in the city or in very heavy traffic is VERY NICE.

 

[fika]

20 software revisions later I got it working quite well.

Regen increased by 400%.
Extended the pedal overrun range. From factory the regen comes in basically in the last 1-2% of travel, there is now 20% of pedal to play with on the Turbo S, on the less powerful cars there will be even more adjustment.

Recalibrated the torque filter/damper so that the regen torque coming in does not feel abrupt even if you just release the pedal.

Fixed the way the switchover works when changing modes, so the car does not start accelerating or braking by itself when toggling the regen while driving in a straight line and holding the pedal steady.

Right now I am able to single pedal drive normal city driving situations (metric, LHD) - slowing down for a turn, going through a 30km/h zone where you have to yield to right hand traffic. Braking for speed bumps.
Adding any more regen it's IMO too much, and when you lift out completely it becomes nauseating.

Ported all the changes to J1.2 also.
Next steps are testing with some customers and collecting feedback and opinions.

Thats great to hear, thank you for all your hard work.

 

[fika]

It's not possible because there is no ABS integration to apply the brakes. Having the car standing without the brakes applied is very dangerous.

How does Tesla accomplish this?

I'm guessing prj means that there is no blended braking control for the regen system in the computer. Since Porsche didn't program a true OPD system from the beginning, prj cannot just add that functionality in.

 

[prj]

How does Tesla accomplish this?

By applying the brakes via the ABS once the car is stationary. As you come to a stop on the motors if you pay attention you can hear and feel how it applies the brakes to hold the car in place.

The Taycan has no such functionality, so even if I calibrate the ASG to make it stationary on the motors, it will not apply the brakes.
If now someone gets rear ended and pushed into oncoming traffic due to that, then I will be responsible for injury or worse.

So I am not touching this functionality. The driver must have the foot on the brake or engage hold with the brake.

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