Tesla may soon support applying the brakes automatically when regen is limited
Forbes
It's challenging to determine Tesla's best feature or the one that has changed driving habits the most, but regenerative braking must be high on the list for anyone who owns an electric vehicle.
After getting accustomed to the system, the brake pedal becomes obsolete.
However, that piece of metal to the left of the accelerator is quickly remembered during cold temperatures or when the battery is fully charged and regenerative braking is reduced or not available.
A feature found in Tesla's latest update (2022.16) appears to address that issue by adding an option to make the car perform the same with or without regenerative braking.
When regenerative braking is reduced and the driver lets off the accelerator pedal the car will automatically apply its regular brakes. This gives the driver a consistent driving experience whether regenerative braking is fully available or limited.
Regenerative braking is one of the most significant factors that make electric vehicles so efficient. While in motion, if the driver applies less pressure to the accelerator or lifts their foot nearly off the pedal to decelerate, most EVs will slow down like the brakes are being applied, but they are not.
This one-foot driving style saves the use of brake pads and sends a charge back to the battery, creating additional energy. Tesla believes this is such an important feature it made the strongest regenerative braking mode standard in 2020.
However, if the car is fully charged, the battery will not take more energy. This system has also been known to act differently in cold climates.
Now, thanks to the 2022.16 update, during those circumstances, specific Tesla's Model 3s and Model Ys will perform the same without the ability to engage regenerative braking.
In the release notes, Tesla stated, "Your car can now automatically apply regular brakes for consistent deceleration when regenerative braking is limited due to battery temperature or state of charge."
According to @greentheonly, this feature is only available on limited Model 3s and Model Ys with specfic hardware. It's possible that Tesla is testing out the feature on very limited hardware or specific vehicles before making it available more broadly in a future update.
Understandably, some drivers may be turned off by the car blending in the brakes without the driver specifically pressing the brake pedal, so Tesla has made this feature optional.
If drivers want to be reacquainted with their brake pedal, then they don't need to enable the new feature; for those who do: tap Controls > Pedals & Steering > Apply Brakes When Regenerative Braking Is Limited. But, again, this is only available for select Model 3 and Model Y vehicles.
There's no news on when it will be made available for more broadly.
Another change came through on the latest over-the-air update, so subtle you may not have realized it was there.
After reading this, you may want to check out the display's top left corner. There is a line that is directly above the speedometer. Maybe you've noticed it before and not given it a second glance, but the line provides some valuable information.
The line is in the center if the car is not using or gaining energy, but it turns black during acceleration and green during regenerative braking.
You're not alone if you haven't noticed it or ignored it, as Tesla has made the line thicker and easier to see. This update is also only available for Model 3 and Model Y Teslas.
Tesla’s been on a roll with Supercharger improvements lately, from the 325kW charging update for the Cybertruck, to 500kW with V4 Superchargers coming next year. While those improvements have been limited to the Cybertruck, Tesla didn’t put all their focus on their new flagship vehicle, but looked at their more affordable vehicles as well.
LFP Battery Heating
Tesla’s Superchargers can now heat LFP Batteries - those that are in the Model 3 and Model Y Rear Wheel Drive variants. This applies to Long Range and Standard Range models, which saw a limited run. This is another update included as part of the 2024 Tesla Holiday Update - which really arrived with a lot of unannounced new features and capabilities.
The change is pretty interesting - Superchargers of the V3 and V4 variety can now pre-heat batteries for Model 3 and Model Y vehicles equipped with LFP battery packs. That means those vehicles are able to get back on the road faster when it's extremely cold. Of course, Tesla still advises you to precondition before you arrive, saving drivers time and money.
Max de Zegher, Tesla’s Director of Charging, also commented on the new feature. Essentially, Tesla is inducing an AC (alternating) ripple current through the battery to warm it up. Keep in mind that Superchargers are DC charging. That means it is possible to get a cold-soaked LFP vehicle on the road 4x faster than before, assuming that it didn’t precondition at all and that it is in the worst-case scenario (below 0ºF).
In essence, Tesla is using some engineering magic to turn the circuits inside the LFP battery into an electric heater - and powering that heater through the Supercharger. An AC ripple current is a small oscillation in the DC charging current that generates heat through electrical resistance, warming up the battery. Those ripples are a byproduct of converting AC to DC and back - so Tesla is using the onboard charger to induce those ripples to warm up the battery. Definitely an innovative technique that’s really only possible with the versatility of the NACS connector.
We’re hoping Tesla can implement this across their full lineup of vehicles, but we’ll have to wait and see how it is trialed across LFP vehicles first and if it is even possible on vehicles with 2170 or 4680 battery packs.
Tesla launched two FSD updates simultaneously on Saturday night, and what’s most interesting is that they arrived on the same software version. We’ll dig into that a little later, but for now, there’s good news for everyone. For Hardware 3 owners, FSD V12.6.1 is launching to all vehicles, including the Model 3 and Model Y. For AI4 owners, FSD V13.2.4 is launching, starting with the Cybertruck.
FSD V13.2.4
A new V13 build is now rolling out to the Cybertruck and is expected to arrive for the rest of the AI4 fleet soon. However, this build seems to be focused on bug fixes. There are no changes to the release notes for the Cybertruck with this release, and it’s unlikely to feature any changes when it arrives on other vehicles.
FSD V12.6.1 builds upon V12.6, which is the latest FSD version for HW3 vehicles. While FSD V12.6 was only released for the redesigned Model S and Model X with HW3, FSD V12.6.1 is adding support for the Model 3 and Model Y.
While this is only a bug-fix release for users coming from FSD V12.6, it includes massive improvements for anyone coming from an older FSD version. Two of the biggest changes are the new end-to-end highway stack that now utilizes FSD V12 for highway driving and a redesigned controller that allows FSD to drive “V13” smooth.
It also adds speed profiles, earlier lane changes, and more. You can read our in-depth look at all the changes in FSD V12.6.
Same Update, Multiple FSD Builds
What’s interesting about this software version is that it “includes" two FSD updates, V12.6.1 for HW3 and V13.2.4 for HW4 vehicles. While this is interesting, it’s less special when you understand what’s happening under the hood.
The vehicle’s firmware and Autopilot firmware are actually completely separate. While a vehicle downloading a firmware update may look like a singular process, it’s actually performing several functions during this period. First, it downloads the vehicle’s firmware. Upon unpacking the update, it’s instructed which Autopilot/FSD firmware should be downloaded.
While the FSD firmware is separate, the vehicle can’t download any FSD update. The FSD version is hard-coded in the vehicle’s firmware that was just downloaded. This helps Tesla keep the infotainment and Autopilot firmware tightly coupled, leading to fewer issues.
What we’re seeing here is that HW3 vehicles are being told to download one FSD version, while HW4 vehicles are being told to download a different version.
While this is the first time Tesla has had two FSD versions tied to the same vehicle software version, the process hasn’t actually changed, and what we’re seeing won’t lead to faster FSD updates or the ability to download FSD separately. What we’re seeing is the direct result of the divergence of HW3 and HW4.
While HW3/4 remained basically on the same FSD version until recently, it is now necessary to deploy different versions for the two platforms. We expect this to be the norm going forward, where HW3 will be on a much different version of FSD than HW4. While each update may not include two different FSD versions going forward, we may see it occasionally, depending on which features Autopilot is dependent on.
Thanks to Greentheonly for helping us understand what happened with this release and for the insight into Tesla’s processes.
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