Tesla offers blended braking (regen when pressing the brake pedal)

[whitex]

Tesla just recognized that blended braking benefits are worth the engineering and manufacturing costs, in order to make it available to their customers.
https://www.notateslaapp.com/news/2...regen-now-applies-when-brake-pedal-is-pressed

 

[whitex]

yeah posted already but no one interested, for now! will never buy the new Y anyway! ?

Y is just the latest Tesla released. I suspect all new models will have it. It was obvious from the get-go that blended braking is more efficient, but a number of folks here tended to argue that Tesla one-pedal driving is the most efficient. ?‍

 

[whitex]

they say only new Y so nothing for the 3 and cybertruck at the moment...but who knows..he can always ado something with an update!

No, they cannot do it via a software update. It required brake-by-wire, which requires different hardware than the older Telsas which have the brake pedal controlling the braked directly. There is an actuator for the AutoPilot to press the brake pedal when it wants to break, but there is no way for the driver to press the brake without the mechanical brakes engaging.

PS> Drove Teslas for a decade, I am very familiar with one-pedal driving. I personally prefer blended braking, but it's a preference. However for efficiency, I know blended braking is more efficient.

 

[f1eng]

Y is just the latest Tesla released. I suspect all new models will have it. It was obvious from the get-go that blended braking is more efficient, but a number of folks here tended to argue that Tesla one-pedal driving is the most efficient. ?‍

That is people falling for the Tesla marketing I think.

It is certainly more efficient if you haven't bothered to invest in the technology of blended braking for regeneration via the brake pedal ? .
Make a virtue out of a shortcoming and non technically minded customers may well fall for it.

 

[Vercingetorix]

I don’t think this blended braking at all. From I’m reading it simply keeps regenerating when the brake pedal is pushed, whereas before the regeneration would shut off. This is more like additive braking I.e regen+brakes. The level of regen seems constant regardless of brake pedal pressure.

 

[whitex]

I don’t think this blended braking at all. From I’m reading it simply keeps regenerating when the brake pedal is pushed, whereas before the regeneration would shut off. This is more like additive braking I.e regen+brakes. The level of regen seems constant regardless of brake pedal pressure.

Before regeneration was not shut off when you hit the brake pedal, but since mechanical brakes were taking most of the energy, regen didn't recoup as much. This new mode disables regen on accelerator lift-off, only applies regen when brake pedal is pressed, i.e. blended braking. It will also allow Tesla to regen much harder, something they could never do with one-pedal (it would be too jarring to allow 250kW regen when foot lifts off the accelerator).

 

[Vercingetorix]

Before regeneration was not shut off when you hit the brake pedal, but since mechanical brakes were taking most of the energy, regen didn't recoup as much. This new mode disables regen on accelerator lift-off, only applies regen when brake pedal is pressed, i.e. blended braking. It will also allow Tesla to regen much harder, something they could never do with one-pedal (it would be too jarring to allow 250kW regen when foot lifts off the accelerator).

But the level of regen doesn’t change from what I’m reading. There is no blending only adding a fixed amount of regen. It might meet the technical definition but it’s a far cry from what Porsche is doing. Do a word search of the document, the word blend is not used once.

 

[whitex]

But the level of regen doesn’t change from what I’m reading. There is no blending only adding a fixed amount of regen. It might meet the technical definition but it’s a far cry from what Porsche is doing. Do a word search of the document, the word blend is not used once.

In the old cars the level of regen is fully controlled by how much you lift off the accelerator, with peak (~60kW) when you lift off completely. I haven't driven the new Y with brake by wire, but I sincerely doubt they will apply full regen as soon as you tap the brake pedal instead. It would be a horrible experience even at 60kW (current max), forget something as high as 250kW (would feel like slamming on brakes). Whether or not it will be as good as Porsche, don't know, but I am sure they will control the amount of regen with the brake pedal, and blend in mechanical braking at some point. Most likely it will also be an evolving system, with continuous tweaks over-the-air, at least in the beginning.

 

[Vercingetorix]

“Drivers now have the option to choose between normal or reduced deceleration when lifting off the accelerator pedal, which essentially means high or low levels of regenerative braking are being applied. However, now, when the brake pedal is tapped, the vehicle decides whether to continue using regenerative braking or use the vehicle’s physical brakes, depending on how hard the pedal is pressed.”

The driver does not have the option of turning off regeneration. The only way to stop regeneration is by using the brake pedal. There is no coasting with a foot off the accelerator pedal.

 

[TonyR]

they say only new Y so nothing for the 3 and cybertruck at the moment...but who knows..he can always ado something with an update!
Tesla one pedal is fun, a bit more relaxing probably, but coasting it's always been used for efficiency so there must be a reason!
school driving recommend to don't use coasting for safety reasons, probably the only possible negative side!

When I was taught to drive in the UK many moons ago engine braking right to a stop or fail the test was the rule. When my daughter were taught 15 years ago coasting to a braked stop was the rule. Energy saving was the new rationale and we have a lot of stick shifts where putting the clutch down disconnects engine braking.

 

[hifi239]

No, they cannot do it via a software update. It required brake-by-wire, which requires different hardware than the older Telsas ...

I doubt Tesla is switching to true brake-by-wire, where the brake pedal is just an electronic pressure sensor (like the failed Mercedes/Bosch system in the early 2000s). Their blended braking likely does require new hydraulics sensors and hardware. It needs a way to 1) sense brake pedal pressure (probably already had that), and 2) prevent that pressure from actuating the friction brakes to full extent while calling for a specific amount of regen to complement the deceleration.

 

[kempez]

When I was taught to drive in the UK many moons ago engine braking right to a stop or fail the test was the rule. When my daughter were taught 15 years ago coasting to a braked stop was the rule. Energy saving was the new rationale and we have a lot of stick shifts where putting the clutch down disconnects engine braking.

Brother-in-law is a mechanic and once said to me: "why would you risk extra strain on the engine, which can cost £000's to repair, instead of the brakes which are literally designed as wear parts?"

Doesn't apply to electric cars because they're designed to regen, but it made me change my braking style

 

[f1eng]

Brother-in-law is a mechanic and once said to me: "why would you risk extra strain on the engine, which can cost £000's to repair, instead of the brakes which are literally designed as wear parts?"

Doesn't apply to electric cars because they're designed to regen, but it made me change my braking style

I think the old advice to use the engine for braking originated from when drum brakes were very prone to overheat and fail going down hills. It made sense. I still use engine braking on hills in ICE cars.

 

[kempez]

I think the old advice to use the engine for braking originated from when drum brakes were very prone to overheat and fail going down hills. It made sense. I still use engine braking on hills in ICE cars.

Yes exactly.

and yeah I always choose a lower gear for steeper hills, a belt and braces approach that one of my cars doesn’t even let us do manually (but it does sense the decline and change gear)

 

[whitex]

Brother-in-law is a mechanic and once said to me: "why would you risk extra strain on the engine, which can cost £000's to repair, instead of the brakes which are literally designed as wear parts?"

Doesn't apply to electric cars because they're designed to regen, but it made me change my braking style

So he believes using compression brakes in large trucks is costing the truckers more?