Regeneration Concerns

[MountainBikeDude]

Well, that's very fortunate for you; unfortunately, not the case for us.

This is hardly the emergency it's being played up to be. If I take my foot off the "gas" and the vehicle isn't decelerating quick enough, or enough to hold me back, then I apply the brake.

One pedal is a convenience, and while it pulls back the amount of force after long stints, etc for various reasons, which we don't honestly have full grasp of why, that's why there is a brake pedal.

To add to this,

The vehicle has no "Creep" mode and there is no engine idle that causes the vehicle to move without input from the driver telling it to do so.

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[Blueboy67]

This is hardly the emergency it's being played up to be. If I take my foot off the "gas" and the vehicle isn't decelerating quick enough, or enough to hold me back, then I apply the brake.

One pedal is a convenience, and while it pulls back the amount of force after long stints, etc for various reasons, which we don't honestly have full grasp of why, that's why there is a brake pedal.

To add to this,

The vehicle has no "Creep" mode and there is no engine idle that causes the vehicle to move without input from the driver telling it to do so.

I understand your perspective, but I simply disagree. When you're engaged in "One Pedal" driving, you get accustomed to the flow/feel of acceleration and stop resistance (regeneration), and it becomes consciously and subconsciously what your expectations are for how the flow is for you to drive. When that flow is dramatically (often instantaneously) disrupted/changed, it can be shocking and dangerous, especially when one is driving an 8000 lb. vehicle on the kind of mountain roads that exist in our area. Frankly, it would better/safer at times if there was no regen at all; and the R1T was driven with no expectations of such flow or regeneration. And for all of you who keep posting that the truck "doesn't lurch forward," sorry it does. Now, whether that's a second of acceleration experienced by force and weight that was held back then is suddenly released, or not, is one thing; but, it definitely happens in our R1T.

 

[emoore]

I understand your perspective, but I simply disagree. When you're engaged in "One Pedal" driving, you get accustomed to the flow/feel of acceleration and stop resistance (regeneration), and it becomes consciously and subconsciously what your expectations are for how the flow is for you to drive. When that flow is dramatically (often instantaneously) disrupted/changed, it can be shocking and dangerous, especially when one is driving an 8000 lb. vehicle on the kind of mountain roads that exist in our area. Frankly, it would better/safer at times if there was no regen at all; and the R1T was driven with no expectations of such flow or regeneration. And for all of you who keep posting that the truck "doesn't lurch forward," sorry it does. Now, whether that's a second of acceleration experienced by force and weight that was held back then is suddenly released, or not, is one thing; but, it definitely happens in our R1T.

It’s not an issue. If you don’t like it then a Rivian might not be for you. There isn’t an acceleration after taking your foot off the gas. It’s either a defective truck or your perception.

 

[Zoidz]

I understand your perspective, but I simply disagree. When you're engaged in "One Pedal" driving, you get accustomed to the flow/feel of acceleration and stop resistance (regeneration), and it becomes consciously and subconsciously what your expectations are for how the flow is for you to drive. When that flow is dramatically (often instantaneously) disrupted/changed, it can be shocking and dangerous, especially when one is driving an 8000 lb. vehicle on the kind of mountain roads that exist in our area. Frankly, it would better/safer at times if there was no regen at all; and the R1T was driven with no expectations of such flow or regeneration. And for all of you who keep posting that the truck "doesn't lurch forward," sorry it does. Now, whether that's a second of acceleration experienced by force and weight that was held back then is suddenly released, or not, is one thing; but, it definitely happens in our R1T.

I suspect it's terminology, but it matters to some, and especially if there is a defect of some sort causing it. Is your "acceleration" perhaps in reality just a reduction in deceleration? The clear answer is on the vehicle dynamics screen. If the energy usage stays in the 'regen zone" of the energy semicircle, it's loss of deceleration, but regen is still holding you back. To be acceleration, the energy usage would have to be in the "consumption" zone of the energy semicircle. Hopefully that makes sense?

 

[Blueboy67]

I suspect it's terminology, but it matters to some, and especially if there is a defect of some sort causing it. Is your "acceleration" perhaps in reality just a reduction in deceleration? The clear answer is on the vehicle dynamics screen. If the energy usage stays in the 'regen zone" of the energy semicircle, it's loss of deceleration, but regen is still holding you back. To be acceleration, the energy usage would have to be in the "consumption" zone of the energy semicircle. Hopefully that makes sense?

Honestly, I hope the new 2023.50 update makes all of this a moot point. However, from a practical/physics point of view, any "loss of deceleration" creates acceleration, as the weight of the vehicle and forward momentum are no longer held back to the same degree, i.e., you start going faster until you apply the physical breaks, because that weight and force are not being held back as much. I understand your point about "consumption" and acceleration but, it you start moving faster (regardless of energy consumption), you're accelerating.

 

[Zoidz]

Honestly, I hope the new 2023.50 update makes all of this a moot point. However, from a practical/physics point of view, any "loss of deceleration" creates acceleration, as the weight of the vehicle and forward momentum are no longer held back to the same degree, i.e., you start going faster until you apply the physical breaks, because that weight and force are not being held back as much. I understand your point about "consumption" and acceleration but, it you start moving faster (regardless of energy consumption), you're accelerating.

That’s why I said it is terminology. In the context of a car, many people consider acceleration with respect to applying power via the pedal, and that’s a fair perspective. From a physics viewpoint, acceleration is an increase in speed over a distance, which is also a fair perspective.

 

[MountainBikeDude]

Honestly, I hope the new 2023.50 update makes all of this a moot point. However, from a practical/physics point of view, any "loss of deceleration" creates acceleration, as the weight of the vehicle and forward momentum are no longer held back to the same degree, i.e., you start going faster until you apply the physical breaks, because that weight and force are not being held back as much. I understand your point about "consumption" and acceleration but, it you start moving faster (regardless of energy consumption), you're accelerating.

Not to worry, once you hit terminal velocity, the truck will no longer "accelerate"

 

[Blueboy67]

Not to worry, once you hit terminal velocity, the truck will no longer "accelerate"

Ahh, there's the kind of cogent, thoughtful, helpful response I was looking for ....

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