Regenerative Braking

Regenerative Braking

Does anyone know if the regenerative brake will have an adjustable setting for more or less braking?
I am assuming that more braking increases the amount of energy recovered. City mode highway mode?

Robert.Boston | January 25, 2012

unless you ask for saddle leather...

Volker.Berlin | May 22, 2012

It's finally official. Regen will be user-adjustable, from day one:

"One of the engineering advantages that make an EV better than any gas-powered car is regenerative braking. When you take your foot off the Model S accelerator, energy is fed back into the battery, which causes the car to slow down (a similar feel to downshifting with a manual transmission). One of our Firmware engineers wrote a great blog about this technology shortly after the release of our Tesla Roadster. Over the past few years, we have learned that not everyone likes the same amount of Regen. Some owners like a little more resistance, some like a little less. Having less Regen means you will likely get less range, but some people still prefer the feel of their car with less Regen. We listened to your requests and I’m pleased to announce that Model S Regen will be adjustable. You can adjust Regen to suit your driving style."

BYT | May 22, 2012

Cool, the question is, what amount of regen is right for you? Having no frame of reference, I have no clue about it! I would think I want MAXIMUM regen to both save brakes and get the most juice pumped back into my Model S batteries. Any arguments against that idea?

Mike_ModelS_P457 | May 22, 2012

@BYT it will probably depend upon the scenario. In traffic / around town, I agree. On the highway you may chose more glide and less regen. I expect I'll play with it to find the right mix.

BYT | May 22, 2012

Agreed, how awesome if we can have a quick flip of regen settings for highway vs. street driving because most of my driving is in roads and I do hit the highway briefly on my daily trips. I can't wait to get a real world feel and see what everyone has setup for themselves and why!

stevenmaifert | May 22, 2012

Love the user-adjustable regen feature. Having test driven a Roadster, I can say it was quite dramatic as compared to the regen in my Camry Hybrid, which is not.

ggr | May 22, 2012

At the Newport event a few weeks ago, GeorgeB said that they want to ask owners to at least try the "standard" (maximum) regen for a week or so before adjusting it. As I have said before and elsewhere, we're leaving it alone... it only took about 15 minutes to fall in love.

mbcaffe | May 22, 2012

does anybody know if it is adjustable "on the fly" It would be cool to adjust to minimum as you enter the freeway.

ggr | May 22, 2012

"... adjust to minimum as you enter the freeway"? I don't get it. It's freeway driving where I think it comes into its own! Those random "pressure waves" of brake lights when you can't see any reason for them, or the 0-30 traffic jams...

Brian H | May 23, 2012

The steering is also adjustable, from firm to sloppy loose soft. Someone suggested making it speed-dependent.

gianni.terragni | May 23, 2012

The steering is also adjustable, from firm to sloppy loose soft. Someone suggested making it speed-dependent.
It can be adjustable and speed dependent

Supergreekster | May 23, 2012

I think regen would benefit from a "speed sensitive" setting. Heavy for low speeds, stop and go driving, lower for highway speeds, to not have the immediate decel... And I am sure that there is an optimal setting for range which varies with speed.

+1 for "speed sensitive steering" setting. Which is really speed sensitive power assist...

BYT | May 23, 2012

+1, I also agree with the "speed sensitive steering" setting

jerry3 | May 23, 2012

Regen kills mpg on the Prius, it's just better than a poke in the eye with a sharp stick when you have to stop anyway. Allowing the car to glide (no power no regen) increases mpg a lot because all the kinetic energy is used for motion rather than some of it heating up the motors and battery.

DallasTXModelS | May 23, 2012

Thank goodness MPG has nothing to do with the Model S.

jbunn | May 23, 2012

Jerry is correct. George Blankenship was less than precisce in his blog. Turning down regen should not cost economy. In order of savings; dont drive, coast, regen, friction brake... regen at best loses something like 15% over coasting. Regen does work when the prius in front stops faster than you can coast down to avoid bending metal...

Brian H | May 24, 2012

right. Less guesswork involved than coasting!

steven.maes | May 24, 2012

I drove a lexus RX450 last night. Very interesting to examine the regen on this car. I had never had the pleasure to drive with a hybrid before.

When you step off the gas pedal, the car starts with the regen. It is nice to see this in the dashboard too. When you hit the brakes, the regen increases.

Having this experience, I don't really agree with the speed sensitive regen. You can actually feel the regen very well, going fast and going slow. I don't see how you would prefer to have it changed depending on the speed.

When you go fast, you will automatically "brake" a little. When you go slow, you don't want your car to "brake" harder when you step off the electric pedal then going fast. It would be super annoying.

mbcaffe | May 24, 2012

I drive my wife's lexus RX400h and don't feel the regen braking requires any driving adjustment. However, I do hear the a slight high pitch sound in the rear when braking. I hope this does not occur on the Model S

Alex K | May 24, 2012

I was wondering if the Model S will turn on the brake lights when the car decelerates quickly due to regen or when adjusting its speed automatically with cruise control enabled? I would think this is a safety requirement. The last 3 hybrid cars I've had (Prius, Rx450h & Panamera) all do this when cruise control is used. The Panamera will also flash the brake lights when decelerating "very" quickly.

Teoatawki | May 24, 2012

Brake lights will go on during regen, but I don't know what the threshold is.

foto | May 24, 2012

@araxara, did you, family or friends own the three hybrids or did you just go for a test drive at the dealership?

Alex K | May 24, 2012

@ bfadewole: No, I've owned/own all three cars. I still have the RX450h and the Panamera. The Prius was sold to make room for a Nissan Leaf.

foto | May 25, 2012

Alex, I guess you'll probably be planning to sell one of the other two "to make room" for the Model S, which one will go? Where do you live, I wouldn't mind coming over to test ride those cars.

BTW, did you change your handle as I believe I was responding to a araxara?

Brian H | May 25, 2012

Maybe he's Japanese, and "araxara" was phonetic?


Alex K | May 25, 2012

@bfadewole: I'll probably sell the Leaf. It's actually a lease, so I may buy it out and then sell it. I live in Tucson, AZ. You're welcome to come by.

Yes, I changed my username from araxara to Alex K. It's a bit more descriptive. I was having problems when I registered originally and just picked araxara. I found out last night that the username was changeable.

foto | May 25, 2012

Thanks Alex for the offer, hopefully something brings me that way but I'm in Houston TX and that's 16 hours from you.

Dr. Bob Reinke | July 23, 2013

If you press the Tesla Icon at the top center of the screen it will display an image of your Model S and the breaklights on the image function the same as the actual brake lights---and yes the brake lights, light when you release the go-peddle or use the brakes. The brake peddle has a switch and there is a momentom switch that turnes on the breaklights when you decel.

Brian H | July 24, 2013

The MS doesn't peddle anything. It has 2 pedals, tho., the brake and goose pedals. ;) They manipulate momentum.