Tesla makes their cars even safer with seat belt pretensioning
Tesla
Elon Musk used Tesla's quarter two earnings call to highlight several accomplishments made by his company in recent months, including one that may have gone under the radar.
In the 2022.20 update, Tesla introduced a Seat Belt System Enhancement. Musk expanded on the upgrade and its importance to the auto industry.
"Our safety team also introduced a feature that tension seat belts if the vision system detects an imminent collision, which has never been done before," said the CEO as he described the predictive, vision-based seat belt tensioning program.
While the seatbelt is considered the single most effective safety technology in the history of the automobile, it has a fundamental flaw as it only provides tension when there is an impact.
However, Tesla's advanced camera system has made seat belts safer. "The car has got to be crunching to trigger the seatbelt tensioner, but because we have the vision, we can actually see that a collision is about to occur with 100% probability before it actually happens."
Tesla's Q2 document shows a chart that displays the seat belt tension performance in three different scenarios, belted, belted with a pre-tensioner and belted with the vision system. The vision system mirrors the vehicle's deceleration closest and shaves off milliseconds to better restrain the occupants.
Tesla compares seat belt occupant accerlation using various systems
Tesla
"This is a fundamental safety advantage that Teslas are now able to offer. And there is also an over-the-air update, so this is something that will be in place in all cars that have at least AP3 hardware," said Musk. This latest update further enhances its outstanding safety features; it provides a pretension to the seat belt and can adjust the airbag deployment faster.
The Seat Belt System Enhancement is available in update 2022.20 and higher and the feature is available for all newer Teslas, which includes the new Model S and Model X, all Model Ys, and newer Model 3s.
Tesla prides itself on developing the safest vehicles on earth. The Model S, Model X and Model 3 scored the lowest overall probability of injury of any vehicle ever tested by the U.S. government's New Car Assessment Program. The NHTSA has assessed Teslas with a 5-star safety rating. In addition, the Insurance Institute for Highway Safety (IIHS) has given Teslas the top safety pick numerous times. Most recently, calling the Model 3 the Top Safety Pick of 2022, IIHS gave high marks in every category, including superior scores for front crash prevention.
This latest safety improvement, yet another trailblazing moment for the automotive industry, will surely draw more kudos and, hopefully, save more lives.
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.
