How Tesla's Regenerative Braking Works

Tesla offers three stopping modes

Not a Tesla App

Braking is essential to the driving experience, but not all systems are created equal. A regenerative braking system (RBS) is the most significant difference people notice the first time they operate an electric vehicle.

Regen, as commonly referred to, makes it possible to drive a Tesla and never touch the brake pedal (along with some brake blending for slow speeds), not only reducing wear and tear on braking components but putting energy back into the battery. There are some estimates that regenerative braking can add 10 percent more range and extend the life of braking mechanisms by more than 50 percent.

What is Tesla's Regenerative Braking?

Unlike traditional brakes, which rely on friction to stop the wheels from turning, regenerative braking uses the vehicle's electric motor to create resistance to slow down the vehicle. In addition to slowing the vehicle down without the use of brakes, the motor running in reverse acts as a generator and captures the kinetic energy that would typically be lost as heat and converts it into electrical energy, thereby increasing your vehicle's range.

How to Activate Regen in a Tesla

In a Tesla, the regenerative braking system is activated by lifting your foot off the accelerator. The more you ease off the accelerator, the stronger the braking force and the more energy is captured.

Tesla's Power Meter (Regen bar)

Tesla's power meter, also known as the regen bar or line

Not a Tesla App

All Teslas feature a power meter either in the instrument cluster (Model S and X) or the center screen (Model 3 and Y) that displays the amount of energy being captured through regenerative braking, or the amount of energy being used by accelerating the vehicle.

The center of the line is considered neutral. Anything to the left of the center point means energy is being captured, while anything to the right means that energy is being used.

The further the line grows to the left, the greater the amount of regenerative braking is taking place, and the more it moves to the right, the greater the amount of power is being used.

The regenerative braking line is green, while the power line is black (or white when in dark mode). You may occasionally also see a gray line on the left side. This will appear if the vehicle has the 'Apply Brakes When Regenerative Braking Is Limited' feature turned on. This feature introduces a consistent braking experience when lifting your foot off the accelerator pedal when regenerative braking is limited.

You may also see the gray line appear on the left side of the power meter if the vehicle is in Autopilot. This helps the driver understand when the vehicle is using regenerative braking or physical brakes to slow down.

How Does Regenerative Braking Work?

Without getting too deep into Physics, kinetic energy is energy in motion. Therefore, anytime a car slows down, the kinetic energy that is produced has to go somewhere. With traditional brakes, that is heat from abrasion generated from the brake pads squeezing the rotors. But this energy can be used in a different way. In the words of a Tesla engineer, "kinetic energy stored in a moving vehicle is related to the mass and speed of the vehicle by the equation E = ½mv²."

You can see this equation play out every time you drive your Tesla by looking at the vehicle's power meter.

The motor controller manages the torque of the motor. This action helps with both driving and regenerative braking. The position of the accelerator pedal tells the motor controller how much torque is needed. The motor controller then changes this into a voltage or current that produces the correct torque. The rotating force can be positive or negative. When it is negative, it means the vehicle is slowing down, and energy is returned to the battery.

Regenerative Braking Explained

Regenerative Braking Extends the Life of Your Brakes

One of the benefits of regenerative braking is that it can help to lengthen the life of your brakes. Regenerative braking slows the car reducing the work of your traditional braking system. In fact, Tesla estimates that their cars experience 50 percent less brake wear than conventional gasoline cars. Elon Musk predicted that Tesla's Semi would have brake pads that would "literally last forever" because the regenerative system would save those pieces from being used extensively.

It's estimated that regenerative braking captures up to 70 percent of the kinetic energy usually lost during braking and is put back into the battery. As described above, that energy can then extend the range between needing to charge.

Does Regenerative Braking Activate Your Brake Lights?

During regenerative braking, Tesla will still activate the brake lights when the vehicle is slowing down, even if the brakes aren't being used at all. Tesla determines whether to turn on your brake lights based on your vehicle's rate of deceleration. If you're unsure if your brake lights are on, look at your Tesla screen, the car in the display shows the brake lights lit up when the brake lights are activated.

Levels of Regenerative Braking

It's important to note that regenerative braking cannot be turned off. There are two regenerative braking modes for 2020 and older models — low and standard. Tesla recommends that you use standard to maximize your vehicle's range. At some point in 2020, that choice was taken away, presumably to use all the benefits of regenerative braking all the time. However, there were some concerns, as regenerative braking can slow down the car rapidly; therefore limiting traction, the vehicle could slide. Tesla has this warning on its website: In snowy or icy conditions, Model S may experience loss of traction during regenerative braking.

Tire Configuration

The company also notes that installing winter tires may temporarily reduce regen. But the vehicle's systems are constantly recalibrating, so the feel of the vehicle will return to what the driver is used to after a few miles or trips.

You can speed up the calibration process by selecting the type of tires your vehicle is using. To select the type of tires your vehicle is using navigate to Controls > Service > Wheel & Tire Configuration > Tires and choose the appropriate tire type.

Regenerative Braking Limited or Reduced

Regenerative braking is not available or can be limited during certain conditions. If this happens, you may see a dotted line in the vehicle's power meter. If the battery is fully charged, there is nowhere for the kinetic energy to go. Consequently, regen won't work. It also has limited usage during cold weather due to a cold battery. In these cases, you can choose to activate 'Apply Brakes When Regenerative Braking Is Limited' to provide a consistent slow down experience. 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." But the company did leave this as a preference, and the option can be turned off. You can activate it under Controls > Pedals & Steering.

Stopping Modes

Regenerative braking works best at certain speeds, if you're traveling too slow, regenerative braking may be limited or not available at all.

In a Tesla, your vehicle will use regenerative braking whenever you lift your foot off the accelerator pedal. However, if you're using Tesla's 'Hold' stopping mode, which allows you to drive with a single pedal most of the time, the vehicle will automatically blend in the vehicle's brakes when traveling 4 MPH (6.5 KPH) or slower.

If you're using Tesla's 'Creep' or 'Roll' stopping modes, the vehicle will never apply the brakes when lifting your foot off the accelerate, which means the vehicle will continue to roll at slow speeds when regenerative braking is no longer effect.

A Brief History of Regenerative Braking

Tesla used regenerative braking in its first car — The Roadster, in 2008. A year later, the same mechanics of the system were implemented in Formula 1. It is called KERS, which stands for Kinetic Energy Recovery System. It provides such a horsepower boost that it was banned for a season before being regulated the following year. However, this advanced system dates back to the late 1800s.

The Sprague Electric Railway and Motor Company is the earliest known use of the technology in 1886. General Electric used regen in 1936 in its locomotives, and Oerlikon, a Swiss company utilized some components of the system in its gyrobus. The Amitron, a concept electric car created by the American Motor Car Company included regenerative braking in its designs. Toyota introduced the technology to its brand with the Prius Hybrid in 1997 and GM's EV1 had regen when the company sent the cars to the crusher.

Regenerative braking is now a staple of the electric vehicle experience, not only reducing maintenance costs but also improving the vehicle's range and letting drivers accelerate and slow down with a single pedal.

420 Anyone? Tesla's New Release is the Most Powerful Model 3 Ever

Courtesy of @BooDev/X.com

The latest Tesla Model 3, the fastest yet, is poised to make a significant impact on Tesla's lineup. Speculation suggests the updated Performance Model 3, potentially named "Ludicrous," could be unveiled soon—possibly on April 20. This would, of course, be on 420, aligning with Elon Musk's fondness for the date, which falls 69 days before his birthday—nice.

Revamped Performance and Engineering

"Welcome to the Most Powerful Model 3 Ever," announces the Great Britain Model 3 configurator source code teaser, setting the stage for an electric sedan that surpasses its predecessors in every metric. The heart of the new Model 3 Performance lies in its all-new high-performance drive units, rumored to deliver a combined output of over 500 horsepower. This power upgrade is not just about higher numbers but also about how it translates to the asphalt.

TONS of new Model 3 Performance details were revealed in the Great Britain Model 3 configurator source code. “Welcome to the Most Powerful Model 3 Ever”

All-New Adaptive Suspension
Adaptive damping powered by in-house software gives you enhanced body control, without sacrificing… pic.twitter.com/cem4TDV80w

— Nic Cruz Patane (@niccruzpatane) April 17, 2024

Tesla has reengineered the vehicle with an all-new adaptive suspension system. This system, powered by bespoke in-house software, ensures enhanced body control, maintaining comfort without sacrificing performance. The result is a vehicle that can handle daily commuting as smoothly as it navigates tight corners on a race track.

Advanced Design and Aerodynamics

The Model 3 Performance features redesigned front and rear fascias and a rear diffuser that enhances visual appeal and improves high-speed stability. A carbon fiber spoiler adds to the aerodynamic efficiency while asserting the car’s sporty aesthetics.

One of the standout features of the new model is the Forged Performance wheels. These lightweight, staggered wheels are not just about style; they enhance the vehicle’s turn-in response, improve predictability, and increase traction out of corners, all while optimizing aerodynamics.

Where Comfort Meets Performance

Inside, the Tesla Model 3 Performance introduces a completely revamped interior. The all-new seat design includes enhanced side and cushion bolsters to hold occupants securely in place, which is crucial during high-speed maneuvers. Ventilation is built into the seats to keep the driver and passengers cool and comfortable, reflecting a thoughtful balance between performance and luxury. The cabin's aesthetic is elevated with lightweight carbon fiber décor and a refined weave pattern unique to the Model 3 Performance.

Performance Interior (New Model 3 Performance)

All-new seat design with enhanced side and cushion bolsters hold you in place, while ventilation keeps you cool. The lightweight carbon fibre décor and refined weave pattern is unique to Model 3 Performance. pic.twitter.com/1R0UhERmHB

— Nic Cruz Patane (@niccruzpatane) April 18, 2024

A significant highlight is the Track Mode V3, an innovative feature that allows drivers to tailor the handling balance, stability controls, and regenerative braking to their preferences. This mode integrates a performance-optimized powertrain with adaptive suspension controls, creating a driving experience that is not only responsive but also enjoyable.

The unveiling of the Model 3 Performance is imminent, as indicated by its addition to the configurator source code. There is speculation about a media embargo lifting on the 23rd, possibly coinciding with Tesla’s earnings day, which could provide further details or even see the official launch. My money is on 4/20, which will give a weekend for all influencers who got an early look to ramp up the views and bring that stock (down 40% year to date) some time to rebound before the earnings call.

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First Look at Tesla's V12 User Interface, Full Screen Visualizations and New Media Player [Updated: Photos and Video]

EFIEBER_ANDRE

Tesla's latest V12 user interface will change the look and feel of some of the vehicle’s operations. This new interface, announced on X, is already partially available on the Cybertruck but will now be rolled out to the Model 3 and Model Y, equipped with AMD Ryzen processors according to Tesla. However, the new Model S and Model X will likely receive it as well, although possibly not at the same time. It integrates several new features and aesthetics that set new standards in vehicle interface design.

The new interface will become available in Tesla update 2024.14, which started rolling out to employees yesterday.

New Parked Vehicle Visualization

A standout feature of the v12 UI update, not to be confused with FSD v12, is the centralized vehicle visualization, which dominates the display while parked (video below). This design choice enhances visual appeal and improves functionality by placing critical vehicle performance metrics, and status updates front and center. Similar to the layout in the Cybertruck, this feature provides drivers with a clear and immediate view of their vehicle's status and shows off the gorgeous 3D model.

V12 Ansicht (Frühlingsupdate)
👉Kein Autopilot, EAP, FSD aktiv.
👉Bremslichter werden angezeigt.
👉Blinken wird angezeigt.
👉Geile Darstellung
❤️Danke liebes Tesla Team pic.twitter.com/lmzTjKIq1x

— EFIEBER (@EFIEBER_ANDRE) April 18, 2024

New Media Player

There’s a new media player that’s larger and easier to use. By increasing the size of the media player, Tesla is now able to fit additional options that were hidden before, such as EQ and audio settings, the search icon and shuffle and repeat options.

The new media player appears while the vehicle is parked, driving or while the visualizations are in full-screen mode.

The media player is available on the Model 3 and Model Y and according to Tesla it’ll be limited to vehicles with the Ryzen-based infotainment center.

Tesla adds a new media player in update 2024.14

Improved Navigation

The navigation system will see several improvements. You’ll now see a little trip progress bar that lets you visually see how far along you are on your route.

If your vehicle has a rear screen, as in the new Model 3, the redesigned Model S or Model X, then trip information such as ETA will also be displayed on the rear screen.

Tesla already has the ability to update your route if a faster route becomes available. You can change some of these settings under Controls > Navigate. However, now the vehicle will show you if a faster route becomes available and gives you a chance to cancel the updated route if needed.

Expanded Autopilot Visualizations

Tesla is now bringing its full-screen visualizations outside of North America. However, there will be some improvements as well. In addition to being able to have the visualizations go full screen, there will now be a small map displayed in the corner as well.

That’s one of the issues with the full-screen FSD visualizations right now. If you make them full-screen, you lose your navigation map completely and only have the next turn available.

This will be the first time full-screen visualizations are available outside North America. It’s not clear whether all the FSD visualizations will be available such as traffic lights, curbs and more will be displayed, but Tesla has slowly been adding additional visualizations for non-FSD users, so there’s a chance that this feature will finally display all FSD visualizations to users outside of North America.

It’s not immediately clear whether this feature will require Enhanced Autopilot (EAP) or FSD.

Update: The full-screen visualizations do not require FSD or EAP, but unfortunately the visualizations displayed are still the same ones as in previous updates, so it won’t display the surrounding environment and curbs.

Full-Screen Browser Support

With this update, Tesla will finally let you manually make the browser full-screen. While this will make Tesla’s Theater apps a little redundant since they just loaded the website of the selected streaming service, you’ll now be able to stream any video service full screen, as long as the service supports Tesla’s browser.

As expected, the full-screen button will only be available while the vehicle is parked.

Checking Compatibility

Owners can verify their vehicle’s compatibility with the new full-screen visualizations while parked and driving by navigating to Controls > Software > Additional Vehicle Info on their Tesla’s touchscreen. This update is tailored for Tesla vehicles equipped with the AMD Ryzen processor.

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