Ha, yep that is accurate.

But bmws have regenarative breaking..... there is no accuracy... All bmws have 48volt motors to enhance performance..

@@blocksource4192Do you mean hibrid or efficiency dynamics ?

🤣

@@AkmalPROMVP they all have mild hybrids…

Some elevators and bikes have regen braking too

LR AWD Model S and X used to use a PMSM on front axle and induction on rear, whereas the 3/Y use induction front and PMSM rear. Since the refresh launched, they’ve used 2-3 PMSM motors. This is a little bit of a dent in efficiency because the PMSM generates a force each time it spins around even when no power is being fed to it. This is why Hyundai/Kia/Genesis, Mercedes, Porsche, Audi, etc. all fit a mechanical decoupler to one of their PMSM motors so it doesn’t spin and create drag when not needed for power. It’s honestly a little surprising Tesla didn’t keep an induction motor on the LR AWD S/X or invest in a clutch to decouple one or two of the motors from the drivetrain like the Germans and Koreans have done, but they didn’t. Hyundai claimed the addition of the clutch system improved cruising efficiency 9% on average on their AWD models. In my experience it’s closer to 20% at highway speed.

All true, but regenerative braking systems will still employ the friction brakes at times, because optimizing energy recovery while also stopping the vehicle means strategically drawing braking torque from the friction brakes, rather than relying entirely on engine/motor braking over the entire deceleration curve.

It’s much more simpler. Permanent magnet motors are synchronous, they do not need any input to generate power, their frequency is synced to their rotation rate. To regen, just simply pause the inverter and hook up a rectifier is all you need.

They can either blend in friction brakes or use "plug braking", basically using the motor backwards (actually consumes power).

Even permanent magnet motors need to blend normal brakes below 3-5mph. It’s just automatic with EVs with One Pedal Driving

@@j.phoenix technically they can using what's known as "plug braking" but it actually consumes power instead of generating it.

I think they are controlled by the computer. I know in my car as soon as I barely reduce pressure on the accelerator the brake lights come on, I don’t have to press the brake pedal.

#1 question asked on Tesla test drives, they say. The brake lights are turned on when braking, automatically. The cartoon version of the car on my screen shows the brake light illuminated.

It's not just EVs, modern gas cars have special brake light logic as well. For example, when you are in hill hold/auto vehicle hold, or in collision avoidance emergency braking, the brake lights will turn on even though the pedal isn't applied. This caused an issue with the new Ford Ranger because they forgot about this when designing their trailer brake controller, so there's a stupid harness running from the front through the roof to the CHMSL to get a braking signal.

Its the best thing since sliced bread. It is a much more relaxing drive when you barely have to lift your foot from the accelerator I can't imagine driving a car without it.

Is the regen really doing all the braking, or is the car just automatically applying the friction brakes for the last bit?

@@adrianthoroughgood1191 The car automatically applies the friction brakes. In fact, teslas have power meters that show how much energy is entering or leaving the battery, and if you take your foot off the accelerator entirely and let the car stop itself, it doesn't show any energy entering the battery anymore after it goes below 2 or 3 miles per hour.

If it worked like EVs, you'd lose speed going down hills if you used this technology but you'd be able to use it to go up hill at least. I think some E-bikes have similar tech to what you are asking. I personally wouldn't trade my fun bombing down hill at 50mph on a bike or coasting for miles for some uphill convenience but I'm sure many would. Guess it'd have to be a toggle for on/off when you wanted it, ideally. Also, regular bikes have this too already, to charge headlights and cell phones, look up "dynamo hubs" for bikes.

why would you waste more power?

@@DrDrift-rl6cc Won't it recharge the battery instead since we are consuming rotational kinetic energy of the wheel? Energy has to flow somewhere, right? (Btw Work done by torque is negative when angular displacement is in opposite direction, so motor 'should' act like a generator)

Probably way less than 10%. Stopping from 60 MPH typically takes around 5 seconds. Let's be generous and say it takes 10 seconds. How much charge can be put into an electric car battery in 10 seconds? Not much. Even if the car is stopped 20 times from 60 MPH, that's still less than 200 seconds of charging time which won't increase range much at all.

@@dno8025 yep, there will always be waste heat in the end, cannot beat entropy

@@dno8025 That assumes all braking is as aggressive as you describe. In reality, you can often coast to maximize the regenerative braking energy captured

@@gabedarrett1301 - Using only regenerative braking it takes less than 10 seconds to get from 60 to 0 on many electric cars.

You can control Regen stopping power on the fly in some EVs. It's in some menus in Teslas but right by the steering wheel with levers/paddles in some cars like the Ioniq 5. I prefer the paddles, much more convenient when you need to change braking NOW

During cruise mode, you only need energy to overcome the frictional drag offered by air and friction due to tire rolling on ground. This energy is very less than accelerating a vehicle. Further modern cars are very aerodynamic, hence they have low drag resistance. This drag also depends on vehicle speed you are going but as you would usually use cruise mode on relatively close speed values therfore it shows same line.

@@zia.g63 Let me rephrase the query "Cruise at 40kph and Cruise at 90 kph. Which one will be taking more charge (given that both have flat line)?"

@@HinduismRayofHope ofc the 90 kph will take more power and deplete your battery faster.

@@siontheodorus1501 Thanks, so the flat line on energy history is unreliable?

@@HinduismRayofHope if it just shows consumption history with only a line without any values or scale shown, i guess it is more to unusable instead of unreliable

That's right, motor is always connected to wheel

@@beakmannHello, thanks for answering my question. Well, that seems pretty ineffective to me, as the motor either drives the wheels or is driven by the wheels and recuperates, which probably means quite substantial losses in the charging / power conversion train. I use the Neutral gear all the time when driving my 1.7 CRTD diesel Opel Astra. That way it only consume about 4.2 l/100km.

​@@medvidekkrupicka1404regen can be about 90% efficient. But yea, sometimes it sucks to be unable to roll

In some EVs there is. You can turn off Regen entirely in some models.

It just flips from the motor spinning the tires with battery power, to the tires spinning the motor instead as your car is rolling. The hard work of cranking the motor slows the tires down and the reversal also puts power into the battery.

We could build in a steam boiler, but that would be a lot of extra parts.

I'll venture a guess there's break blending like mentioned in the video which activates the break when you release the throttle.

@@MrSterorNo, you can actually stop the car completely with regen. It works best at lower speeds like around 40 mph and less, the lower the speed the stronger the regen is, but it does need practice to get the timing right so you can stop the car where you want it. An update added physical braking when regen isn’t at full capacity like when it’s cold or having a high battery SOC.

@@gabem8119 how do you know you're only using regen? My 2014 Tesla MS will regen break fine at high speed but at about 3-5 km/h the regen is so weak it becomes infeasible to use. Newer cars can do break blending so they use friction brakes when regen is not enough. If you are sure that your car is not doing break blending and can stop from 10 km/h to 0 in under 3 seconds, I really want to know what car it is and why mine can't do that.

All the new Teslas 2020 and newer stop on their own very quickly. I owned a Chevy bolt that stopped on its own, no braking. My 2021 model y stops on its own, no breaking. There is a toggle in the car specifically for to be able to using breaking when regenerative breaking is not available, but it’s very clear the purpose of this is to function as normal when it is fully charged. For folks who have never experienced regenerative breaking, if your car is charged to 100%, the car will not activate regenerative braking. So, it will coast as it normally would, as if it is in neutral or how a gas powered car would coast. Most electric cars nowadays will stop completely using only regenerative breaking. This video is extremely outdated.

It could in some situations, but would recoup less power by doing so. Your regenerative braking system cannot optimize energy capture if it needs to prioritize stopping the car. The two goals aren't perfectly aligned. Strategic use of the friction brakes actually allows regen braking to be more efficient.

I think you would have to keep your foot on the accelerator pedal lightly but then the cars weight would pull the car down faster, meaning the RMF would be rotating faster than the motor so it would be charging it, if I am understanding this correctly. If you are fully off the throttle I think you will regren but still slow down. If you are light on the throttle I think you will regen and keep speed. Can anyone confirm or correct me?

There are some EVs where you can adjust the amount of regen or turn it off completely

No

Yes

This was the comment I was looking for.Bloody dangerous for the vehicles behind it.

​@@mehmettemel8725Tesla puts brake lights on.

nonsense. in the USA, NHTSA requires (of all manufacturers) the activation of brake lights upon deceleration. additionally, there are laws against vehicles' brake light system not being functional.

I can’t believe with all the technology we have today, there are still people who think that the only way to have a functioning brake light is to tie it to the physical action of pressing a pedal… The brake lights are tied to rate of deceleration, not to usage of a pedal or application of friction brakes.

All electric motors are reversible with the right controls.

You simply ease off the accelerator pedal, not take your foot off completely, and then it does what you would call coasting. It feels very simple and natural.

It's not all-or-nothing. You can ease off the accelerator in one-pedal steering, or in some vehicles use paddles by the steering wheel to "downshift" or "upshift" for different levels of regeneration and braking power.

Alternator

Normal combustion engine already has alternator that takes some energy from the engine and converts it into electricity. Headlights are pretty low power so it isn't a big load, but for A/C that one requires big power especially when the compressor is on.

Lots of new gasoline cars in EU since 2020 are now mild-hybrids with 48 V battery charged during regen braking.

A normal car battery can’t handle the amount of power that regenerating creates. At peak regen can be pushing 80kW or more of power, depending on the car. You need a separate high voltage battery to do this. Only hybrids and EVs can do it.

Check data. Driving down through mountains, a battery can recharge almost all the energy used going uphill.

@@FrunkensteinVonZipperneck Wrong . Completely wrong. What I said 2 months ago remains true. Very very little energy is recovered.

The motors don't run very hot at all.

@@logitech4873 It depends how fast & hard you run them. That is why over boost or "Pass" is only for a few seconds. Also braking generates tremendous heat, so much so even Carbon Composite rotors glow red on F1 & Indy cars. Can a motor really turn the friction from braking heat into electricity at the rate required in the time available?

@@kevinburke6743 "boost" or "pass"? Huh? The motors absolutely don't run very hot. They are liquid cooled and shouldn't go above around 100-120°C. When I drove around Nürburgring 3 times this summer in my Model 3 with regen set to full, the motors never got very hot. I had contact microphones mounted to one of the motors via plastic clips, and they stayed on all day. Friction brakes convert almost all of the energy to heat. Regenerative braking converts ~80% of the energy back to battery storage. The heat from this is easily managed by the cooling system.

@@logitech4873 Good to know, so why don't they put oversize or additional motors on EV's to do all the braking? Or is it legislation? A car (EV) without traditional brakes would be so much easier to maintain! No pads or rotors, no dual circuit hydraulics. A good chunk less unsprung mass! So it would be only steering and tyres that would be wear/replace when worn parts?

@@kevinburke6743 Modern EVs already do the vast majority of braking via regeneration. I almost never use the disc brakes on my Model 3. However there are several good reasons to keep the physical brakes: 1 - Regeneration braking is never as strong as hydraulic brakes. You wouldn't be able to brake as fast in an emergency. 2 - When coming to a complete stop, normal brakes do a much better job at keeping the car stationary. 3 - When the battery is at 100%, regeneration will not work because the battery cannot take more charge. 4 - When the battery is very cold, regeneration will be much weaker because the battery cannot accept a very fast charge. (Battery needs to be 20°C+ for optimal regeneration) 5 - If your car malfunctions, it's important to have a mechanical backup for braking. So for now it's best to keep both.

I read somewhere that it's 20-60%

I don’t know if that number is accurate but keep in mind he’s talking about efficiency for driving overall. Regen can only recover energy when you’re slowing down. So if you’re just cruising on a highway for example, it’s not doing anything. In terms of merely regen itself, ignoring total car efficiency, regen is about 85% efficient (in terms of converting your kinetic energy to electric). So the process is very efficient. It’s just that the majority of driving does not involve stopping, so the overall efficiency boost isn’t huge.

Increasing your range by 10% by recouping energy lost to unnecessary acceleration or banking energy on downhill runs is huge. If you over-accelerate and over-brake, and never change those habits despite the car telling you it's killing your range, then technically regenerative braking might be extending your range more than 10%, but your total range will still be less than if you were driving sensibly.

Turn off Regen braking. I think you can't do that in a Tesla but you can in some EVs.

Rethink your priorities.

Maybe some people have nothing to do so they enjoy going to the auto repair shop to get new brake pads installed. And don't forget oil changes, replacing the timing belt, transmission repairs, and smog checks!

SSAKCAJ SDRAWKCAB TAHT TOG UOY

Petty

It’s referring to a Tesla so it’s breaking 😂

They do…brake lights are triggered by deceleration rate nowadays.