Rivian "Joe Mode"

[rpmtexas]

Rivians have collision mitigation braking which will kick in and actively reduce speed if you are not in order to reduce impact - in the case of a vehicle on vehicle collision. The vehicle itself is always actively "covering the brake" - so let's not ignore this feature in the conversation.

Vehicle to child? Are we talking at surface street/neighborhood speeds or highway speeds?

Because if you're going over 15-20mph on a street where a child can run/ride out in front of you the problem is that. If you have any time to react - assuming 1-2s - then ANY braking at all is going to greatly reduce the impact - because almost any vehicle can brake from 15mph to 5 or less rapidly via any deceleration method. At least enough to where there might be injury, but it should be minor if at all.

I'm not trying to debate that physically moving your foot from pedal A to pedal B has latency - of course it does. All I have been saying is deceleration begins the moment you lift off, and if it's a full lift at speed, it's not insignificant deceleration so while you are moving your foot to panic stop on the friction brakes you are actively mitigating impact speed to a degree far greater than you would with a traditional "coast" (ICE or EV with coasting "mapped" in) during the time your foot moves to the brake.

Is that not true? You still get a reduced reaction time to deceleration. Covering the brake, or lifting off at full regen. Both require a single action to begin braking. That's it. Can we agree on that?

Because this is getting utterly asinine

It’s all scenarios. Covering the break eliminates two physiological reactions and their associated time without breaking. I’d estimate 1/2 second. You cannot do it in a Rivian. If you lift, regen kicks in and “brakes.”

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[rpmtexas]

Oh, research?

Here you go. If you actually want to read the paper you can probably reach out to the author directly and request a copy vs paying for it.

https://www.tandfonline.com/doi/abs/10.1080/00140139.2021.1908601?journalCode=terg20


For a non-research opinion on it, I find it's easier when emergency braking to hit the braking threshold with regen active versus ending up activating ABS immediately before the weight transfer starts in a vehicle that coasts down.

Nice try, but they aren’t covering the break. So not relevant. I would agree that regen provides an advantage in cases where you are NOT covering the break. My original point was just that the regen doesn’t allow you to cover the break which I like to do as research has shown it helps avoid accidents and is taught in driving schools.

 

[Dark-Fx]

Nice try, but they aren’t covering the break. So not relevant. I would agree that regen provides an advantage in cases where you are NOT covering the break. My original point was just that the regen doesn’t allow you to cover the break which I like to do as research has shown it helps avoid accidents and is taught in driving schools.

If you've ever been to an actual driving school, it probably doesn't matter what you do with your feet because you're more qualified to drive than 99.99% of the other drivers on the road. I've also been to a driving school and I'm telling you that "covering the brake" isn't going to make much of a difference when it actually matters when comparing to an EV with high regenerative braking.

 

[rpmtexas]

If you've ever been to an actual driving school, it probably doesn't matter what you do with your feet because you're more qualified to drive than 99.99% of the other drivers on the road. I've also been to a driving school and I'm telling you that "covering the brake" isn't going to make much of a difference when it actually matters when comparing to an EV with high regenerative braking.

If you've ever been to an actual driving school, it probably doesn't matter what you do with your feet because you're more qualified to drive than 99.99% of the other drivers on the road. I've also been to a driving school and I'm telling you that "covering the brake" isn't going to make much of a difference when it actually matters when comparing to an EV with high regenerative braking.

That’s incorrect. The difference is going to be about half a second. The time for the lifting and moving part of the breaking response.

 

[Brewbud]

That’s incorrect. The difference is going to be about half a second. The time for the lifting and moving part of the breaking response.

You will have that delay from pedal to pedal in any vehicle unless you are a two footed driver. But you could drive like that in a Rivian too.

 

[Quick]

You will have that delay from pedal to pedal in any vehicle unless you are a two footed driver. But you could drive like that in a Rivian too.

The difference is in a car without regen, the delay is irrelevant. I can go into a corner, cover the brake (without any perceivable change in pace), and go back to accelerator after the dangerous situation has passed.

The car hasn’t changed pace. It hasn’t upset flow of traffic. And it’s a safer drive.

This is impossible in the Rivian.

 

[RivAW]

I think Chill Mode is as much or more needed. Some of my kids get carsick from the strong start and stops.

Maybe…or you could just not “gun it” every time….same effect…

 

[SurfnBike]

Man this forum is full of knuckleheads, I'm going to probably go elsewhere for discussions. Some people had some great suggestions, such as muting chimes, adding in a low or zero regen option, and what is the result? Five pages of absolutist armchair warriors saying how things should be exactly as they see it, and arguing with anyone who thinks otherwise. Is this how the Rivian owners are? Are we discussing politics or something? This is a very simple discussion.

Just_lex was clearly being polite and not trying to offend anyone, and along comes Oldsmobile_Mike not wanting any other point of view that may conflict with his
People on other car forums are much more polite.

 

[zymolysis]

Covering the break is about decreasing the lag associated with the physiology of stopping the vehicle - I.e. moving your foot. Research shows it averages 3/4 of a second. It involves removing foot from accelerator, moving foot over to brake, and applying break. Covering the break eliminates two physiological responses and a significant amount of reaction time. This stopping occurs faster or vehicle impact is significantly lessened.

I don't understand your issue. You can still "cover the brake" with your left foot, if you want. But in the times when you haven't placed your foot over the brake, pulling your right foot off the accelerator (engaging regen) and then hitting the brake pedal (with either foot) will be a faster response than the typical move right foot from accelerator to brake pedal.
But there is nothing to stop you from keeping your left foot hovering over the brake just as much as your little heart desires.

 

[Oldsmobile_Mike]

and along comes Oldsmobile_Mike

The mute button is there for a reason, pal. But I dig you using a fake profile to troll people. Cheers! ?

 

[NoGoingBack]

While I enjoy one pedal driving on max regen most of the time, I would like to have the option to turn off regen completely to drive like a traditional car and be able to coast. Especially if I let someone who has never driven an electric car before drive it. One pedal driving can be very weird for someone who has never experienced it and hard to get used to for some. Personally I love it and have gotten used to it. But there are times I’d like a more traditional feel. Seems like it would be easy to add a regen off setting.

 

[Brewbud]

The difference is in a car without regen, the delay is irrelevant. I can go into a corner, cover the brake (without any perceivable change in pace), and go back to accelerator after the dangerous situation has passed.

The car hasn’t changed pace. It hasn’t upset flow of traffic. And it’s a safer drive.

This is impossible in the Rivian.

Pretty much what I inferred in the other post I made 5 above the one you actually quoted.

 

[jimmyb2]

I don't understand your issue.

So true! If you actually understood what he is wanting and why you would not be talking about “cover the brake” with the left foot.

No matter … what is your objection to adding a choice to turn regenerative braking off? Adding that would not interfere with you or anyone else not using the feature.

 

[CharlieS]

I like the Rivian. Can't buy because of the strong regen. I can't believe Rivian wants a few extra EPA credits to milage so much more than the comfort and sells lost because of it. Dumb, just add a 'low' regen that allows for some coasting.

 

[godfodder0901]

I like the Rivian. Can't buy because of the strong regen. I can't believe Rivian wants a few extra EPA credits to milage so much more than the comfort and sells lost because of it. Dumb, just add a 'low' regen that allows for some coasting.

Snow mode has a low option.

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