Tesla continues rapid innovation with new seat patent
In February of 2019, Tesla filed a patent for a “Vehicle seat with an integrated temperature-control system,” and now it seems the company has just updated the patent.
The new system will heat or cool the seats as needed with the use of coolant, which will ultimately lead to increased comfort and reduced power usage.
The new system will be much more efficient and comfortable than current heated seat technology. Traditionally, car seats get heated by an electric current that flows through resistors and get cooled by a fan under the seat.
The difference between electric resistor-based seat heaters and these new refrigerant-based seats could be compared to Tesla vehicles with electric heaters and those with a heat pump.
A model with a heat pump extracts heat from a refrigerant that is run through the system instead of generating heat using electricity directly. Heat pumps are much more efficient at generating heat when compared to electric heaters. We’d expect a similar efficiency gain from Tesla switching to these new temperature controlled seat heaters.
Most seat heating and cooling systems have 3 heat/cool settings that must be manually adjusted. These types of seat heaters are basically on/off switches and can not control the temperature of the seat well.
Tesla recently added automatic seat heater functionality to Teslas to help address this issue. The new auto setting will automatically turn on seat heaters then gradually lower their temperature as the cabin warms. However, it appears that Tesla is aiming to provide an even better solution with this patent.
Precise Temperature Control
These new seats would be able to precisely control their temperature so that you can set an exact temperature for your seat just like you do for the cabin temperature.
The new seats would be much more efficient than using electric seat heaters and would provide better cooling than running cold air through vented seats.
Better Cooled Seats
Ventilating air through the seat is rarely enough to remove excess heat for the comfort of the passenger.
Instead of blowing cold air into the seat, these new seats would work like an air conditioning system, by removing heat from the seat. This would be much more effective at cooling down the passenger.
Additionally, traditional seat heating systems take up a lot of space and are ineffective because heat typically has to travel through multiple layers of fabric and other materials.
The same way fluid is used to heat/cool batteries, the new system will more effectively transfer heat with the circulation of fluid in between layers of the seats.
The new patent includes multiple layers inside the seat. Under the outermost layer of the seat, there will be a layer of heating/cooling fluid. The fluid will circulate under this layer through the entire seat to ensure that all parts are evenly heated/cooled.
This invention shows how Tesla is innovating and paying great attention to detail in every possible way to make their vehicles more efficient, comfortable and enjoyable for the user.
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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