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Regenerative braking on icy roads

Schulz1983

Model Y LR AWD: Matte PPF, Vossen HF-1
May 14, 2021
599
414
High Ridge MO
Yup. I worry about Tesla's built with LG chem batteries. Poor quality assurance is the culprit. Now a minor defect in a small number of battery cells is a multi billion dollar problem.

Keith
Hopefully it is something the model Y will not be affected by. Maybe that is why Tesla is so cautious with the software.
 

Fourdoor

Member
May 31, 2016
996
853
United States
Hopefully it is something the model Y will not be affected by. Maybe that is why Tesla is so cautious with the software.

The most interesting part of this to me is how Tesla had people try to spread a bunch of battery fire FUD a few years back, and the response was a logical break down of how many battery fires there were compared to fires in ICE cars, along with some mitigation attempts by NERFing the battery packs on high mileage Model S's and also NERFing the battery packs on Model S's that had done a boat load of Supercharging.

If Chevy had said "yeah, a lot less Bolts burn up than Gasoline powered cars" they would be throwing their gasoline powered models under the bus... so they can't do that. The other option would be what they are doing as an interim measure. I am currently only supposed to use around 60% of my Bolts battery pack, never charging more than 90% and not letting it go under 30%. If they changed that to 20% and 90% (keeping it to less lose of range than covered by the warranty) and hard coded it via a mandatory software update on cars after they reach a certain mileage, or a certain number of kWh charged via DC fast charging they would be handling the situation the same way Tesla did. The problem is, they can't do it via over the air updates against the car owners will like Tesla can, and many people ignore recall notices and / or would actively choose to not have their battery pack NERFed. As MY owners we don't have a choice, the NERFing is automatic and built in... it isn't even triggered by a software update, it just automatically happens after you hit the Supercharging threshold. I think I will cross post this to the Bolt forum I frequent and see what reactions it garners.

Keith
 

jf64k

Member
May 9, 2020
470
520
Los Angeles
From the manual:


Regenerative Braking

Regenerative braking can be limited if the Battery is too cold. As you continue to drive, the Battery warms up and regenerative power increases (see Regenerative Braking on page 61).
NOTE: Limited regenerative braking can be avoided if you allow enough time to precondition your vehicle or use scheduled departure before your drive, as mentioned previously.
NOTE: Installing winter tires can result in temporarily reduced regenerative braking power but after a short period of driving, Model Y recalibrates to correct this.

And

Blue Snowflake Icon
A blue snowflake icon appears on your touchscreen when some of the stored energy in the Battery is unavailable because the Battery is cold. This portion of unavailable energy displays in blue on the Battery meter. Regenerative braking, acceleration, and charging rates may be limited. The snowflake icon no longer displays when the Battery is sufficiently warmed.
 

patnshan

Member
Oct 7, 2020
217
179
Milwaukee, WI USA
I've personally driven in an ice storm on the stock 20" Goodyear's. In addition to them being horrible in all ways, the regen braking was harrowing to say the least. It takes a lot of getting used to. It also makes your right leg extremely fatigued in my experience. It was absolutely no fun. Tesla needs a proper "snow mode" whereas the regen braking is turned down or off. I can't see that as any bit difficult for them to do. I can't understand why they won't.
 
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WindPower

Member
Mar 23, 2021
46
32
Long Island
Tesla needs a proper "snow mode"

Here, here. While I LOVE regenerative braking, there are times when it can be a dangerous liability. Last winter, there was an unexpected snowfall as I was driving on a highway. A two wheel drive BMW 100 ft in ahead of me in the left lane started to brake, and when I let up on the accelerator to slow down, my Y started to slide. I expected the four wheel drive Y to have better traction, but it slid. I steered the car as it slid and managed to go between the BMW and the guard rail, avoiding an accident.

Tesla engineers ought to use some of the characteristics of the car (like the two motors, the ability to adjust the torque between motors, the mechanical brakes) to create an super safe “snow mode”.
 

Johnny Vector

Member
Jun 21, 2020
254
392
Maryland
Here, here. While I LOVE regenerative braking, there are times when it can be a dangerous liability. Last winter, there was an unexpected snowfall as I was driving on a highway. A two wheel drive BMW 100 ft in ahead of me in the left lane started to brake, and when I let up on the accelerator to slow down, my Y started to slide. I expected the four wheel drive Y to have better traction, but it slid. I steered the car as it slid and managed to go between the BMW and the guard rail, avoiding an accident.

Tesla engineers ought to use some of the characteristics of the car (like the two motors, the ability to adjust the torque between motors, the mechanical brakes) to create an super safe “snow mode”.
Wait, you steered the car successfully while sliding? Ye canna change th' laws o' physics, captain. Unless you have someone out in front with a curling broom, you can't really do that. If you were steering, I'm quite sure that means your ABS system was working as designed. It takes longer to stop, but you maintain steering control. If you're actually sliding, there's no lateral force to change the car's direction.

Also, it's "Hear, hear".
 

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