Not possible to turn off 1 pedal driving?

[mkhuffman]

Is this thread about 1PD?

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[Husky]

Coasting down a hill (not slowing via regen) and using the momentum to help climb the next hill (or continue on a flat road) will be more efficient. Using regen is ~70% efficient in recapturing energy. Using that recaptured energy is about 90% efficient. The increased downhill speed generates more air, rolling and mechanical resistance but not nearly enough to offset the above losses.

In practice very few road/traffic conditions allow full utilization of this technique.

That method assumes you are ok with increasing your speed, possibly by a Lot, rather than maintaining it.

 

[SwampNut]

Astroturfing.

I don't think you understand what that word means. Unless you literally do think that some of us are paid by -someone- to try to influence public opinion.

Is this thread about 1PD?

I thought it was about defining the meaning of the word "is." And "coast."

 

[rvnxyz001]

Holy smokes, sounds more like Reddit conspiracy than evidence.

EPA testing cares a lot about the default factory drive mode. If the car defaults to the most efficient regen behavior, that helps the published efficiency/range story. EPA says vehicles are generally tested in the factory/default mode, and selectable regen levels are considered drive-mode-affecting features.

 

[Mos Eisley]

I don't think you understand what that word means. Unless you literally do think that some of us are paid by -someone- to try to influence public

I got my check

 

[DucRider]

It's not "doesn't allow" - they made a choice. And they had a range target in mind. Turning off regen would lower the total averaged range based on how the EPA tests for it.

regen ≠ OPD

You can turn off OPD in many EVs and still use regen to slow using the brake pedal. It's called blended braking. Doesn't impact range testing (but lowering regen levels in OPD mode does bring the brake pads into play and will reduce range).

Using regen to slow the vehicle off of either pedal is equally as effective in recapturing energy.

Rivian made a design choice not to implement blended braking on their vehicles.

I like reducing or even turning off OPD in low traction conditions. Even with over a decade of OPD driving I find the reflex to lift off the throttle during a skid/slide hard to overcome. For me, it is easier to finely modulate regen braking off of a dedicated pedal instead of finding the balance between acceleration/deceleration on one pedal.

A blended braking system adds complexity and cost. It's very hard to get top notch brake pedal feel when implementing it - particularly in the transition phase when the brake pads are added in.
Tesla implemented blended braking in the Juniper Y refresh. Their original reason for not doing so was not being able to get the brake pedal feel they wanted.

 

[SwampNut]

The rivian has blended braking as an option, and it comes enabled by default. It worked ok, but I prefer to completely separate the two and manage it myself, so I turned it off.

We can now have another half dozen pages on the definition of "blended" and "braking."

 

[mkhuffman]

The rivian has blended braking as an option, and it comes enabled by default. It worked ok, but I prefer to completely separate the two and manage it myself, so I turned it off.

We can now have another half dozen pages on the definition of "blended" and "braking."

You may be referring to "brake assist", which is not considered blended braking. Rivian does not have blended braking. Brake assist is used when regen is lower than expected due to HVB condition (like 100% SoC).

I got us started.

 

[SwampNut]

I got us started.

I knew I could get that going! It's Friday, and I do a neighborhood dinner every week at a neighbor's pool. So I get to bail out, you should keep it going. I'll read it all tomorrow over coffee. Tag, you're it.

Cod ceviche tacos and beans I've been slow cooking for 18 hours.

 

[Oldsmobile_Mike]

After reading this thread, I still don't understand what the problem is with allowing the driver to disable regen

I haven't read all 12 pages of this thread, but iirc, isn't use of regen required to meet Rivian's federal EPA mileage metrics?

Sort of like how gas cars let you turn off "cylinder deactivation" but it automatically turns back on again next time you start the vehicle. It's to meet their advertised mileage requirements.

 

[mojok]

regen ≠ OPD

You can turn off OPD in many EVs and still use regen to slow using the brake pedal. It's called blended braking. Doesn't impact range testing (but lowering regen levels in OPD mode does bring the brake pads into play and will reduce range).

Using regen to slow the vehicle off of either pedal is equally as effective in recapturing energy.

Rivian made a design choice not to implement blended braking on their vehicles.

I like reducing or even turning off OPD in low traction conditions. Even with over a decade of OPD driving I find the reflex to lift off the throttle during a skid/slide hard to overcome. For me, it is easier to finely modulate regen braking off of a dedicated pedal instead of finding the balance between acceleration/deceleration on one pedal.

A blended braking system adds complexity and cost. It's very hard to get top notch brake pedal feel when implementing it - particularly in the transition phase when the brake pads are added in.
Tesla implemented blended braking in the Juniper Y refresh. Their original reason for not doing so was not being able to get the brake pedal feel they wanted.

Exactly. My EX90 lets me disable OPD and only regens when braking. The same with my Polestar.

The R2 added blended braking system that seems to match the more newer blended braking system found on newer cars, so offering to disable OPD wouldn't come at the expense of efficiency.

For those who like how OPD drives, great, good for you! But not everyone likes it, and no, not every EV needs to drive like that. But this "feature" came about because of lack of regen on braking and some form of regen needed to be introduced, and low and behold, OPD came about.

The reality is that all EVs are moving to regen on braking because most people don't drive with max regen enabled for OPD, and thus are in fact losing efficiency when a low/medium regen is chosen for OPD if regen-on-braking is not an available on that car.

Regen-on-braking also allows for the option to capture a higher volume of energy that maybe greater than what the MAX regen on OPD option provides for that car. On me EX90 with OPD enabled at max regen, I still get some amount additional regen applied when braking using the brake pedal.

 

[Horsey]

Because dummies would do it, and waste energy, brake pads, and then whine that their range is half of the promised range.

I get very close to the EPA range on my Lightning in city driving, in a hot climate and have literally never used OPD. The idea that regen makes a significant difference in range makes absolutely no sense with my averages.

 

[mojok]

I get 320/326miles of range promised on my Lightning in city driving, in a hot climate and have literally never used OPD. The idea that regen makes a significant difference in range makes absolutely no sense.

Thats because the Lighting, like newer EVs, R2 included, offers regen on braking. So when pressing the brake pedal, it is actually doing regen up until some stopping force is needed.

 

[Horsey]

Thats because the Lighting, like newer EVs, R2 included, offers regen on braking. So when pressing the brake pedal, it is actually doing regen up until some stopping force is needed.

I'm glad that that's the case, because it makes a whole lot of sense. But why are so many people here advocating for less choice and functionality when there's less overall benefit the consumer? The people saying they're glad there's not the option are advocating for less choice, which is mind blowing to me.

 

[R2D2TOO]

Story: I have a feature in my manual shift Corvette called "Rev Match"'.
When I shift, the engine revs up or down to 'match' the speed I am going and the gear into which I am shifting. I thought it was dumb at first, and I know how and when to shift - from a lifetime of driving manual cars. Then I tried it and decided I liked it.
One day I read an article from the head design guy on the team. Turns out the reason for that feature was to reduce stress on the drive train (caused by inept shifting). Makes sense, except I have to enable it every time I start the car. Why? Lawyers? Maybe. Who knows. I just turn it on every tiem I get in the car.
It doesn't matter anymore, since you can no longer get a new Corvette with a manual.
Moral of the story? There is no telling what goes into design decisions.

I for one look forward very m,uch to learning OPD in my new R2.

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