One Pedal Drive Inconsistencies

[helium89]

I got my car in July 2022, drove exclusively with 1pd until the first snow/ice (Michigan) which was mid-November. I had a bad experience because when you release the gas, you are breaking…that’s bad on ice. I didn’t go back to it this spring.

however, I recall some inconsistency with 1pd. It was rare, but I agree, I was generally able to gauge the distance to stop, but there were a few times when I seemed to be slowing much less than anticipated and I required the brake pedal. That is one of the reasons I didn’t go back to it following winter this year.

I don’t understand this. If you are going a constant speed and lift your foot just a little bit, you get gentle braking that is perfectly fine in icy weather.

Sponsored

 

[Electrifiedsince2013]

You are correct. Everyone was stopping fast on an exit ramp, on ice. I took my foot off the gas, effectively “breaking hard”. I was sliding. I had no control. I did’t do this, but logically the way to break less hard would be to step on the gas, which is counterintuitive and I did not do that.

The same thing would have happened with traditional 2 pedal driving had I hit the brakes hard, but I would not have. I would have let off the gas and applied the brakes in a more controlled way. In the few seconds where it all happened there wasn’t an obvious way to regain control. It was my error, but it was a situation that I wouldn’t want to happen again. I don’t recall any antilock breaks kicking in. I just thought I was going to smash my car and the car ahead of me. I veered left enough just in time to come up next to the car ahead of me. And luckily didn’t get into the lane on the highway.

It all worked out, but because of that event and the differences between traditional 2 pedal driving and 1 pedal, I didn’t want to test it again. Everything was different than every other experience in 30 years of driving. For me, going back to 2 pedal made more sense. Prior to that, I liked 1PD and did not consider changing back.

 

[JohnFoxeSheets]

You are correct. Everyone was stopping fast on an exit ramp, on ice. I took my foot off the gas, effectively “breaking hard”. I was sliding. I had no control. I did’t do this, but logically the way to break less hard would be to step on the gas, which is counterintuitive and I did not do that.

The same thing would have happened with traditional 2 pedal driving had I hit the brakes hard, but I would not have. I would have let off the gas and applied the brakes in a more controlled way. In the few seconds where it all happened there wasn’t an obvious way to regain control. It was my error, but it was a situation that I wouldn’t want to happen again. I don’t recall any antilock breaks kicking in. I just thought I was going to smash my car and the car ahead of me. I veered left enough just in time to come up next to the car ahead of me. And luckily didn’t get into the lane on the highway.

It all worked out, but because of that event and the differences between traditional 2 pedal driving and 1 pedal, I didn’t want to test it again. Everything was different than every other experience in 30 years of driving. For me, going back to 2 pedal made more sense. Prior to that, I liked 1PD and did not consider changing back.

I can totally understand that! Everything you say makes complete sense to me. I was always taught that in slippery situations take your foot of the accelerator and don't apply the brakes at all (ideally) or only very sparingly. Of course this was before the days of ABS, but still. So yeah, with 1PD the situation is very different and I suspect I'd do exactly what you did. Happily I live where we don't have ice in the winter, but if case I encounter some (or standing water), I'll (try to) keep this in mind!

 

[JohnFoxeSheets]

I will have to pay more attention to that, but seems to be mostly flat when I notice.

Since you're both in FL (though I've no idea how far apart), you might want to reach out to @Logal727 since they posted about never needing to use the brakes anymore...

 

[GaryS]

I will have to pay more attention to that, but seems to be mostly flat when I notice.

I have experienced the same inconsistency and it was on flat areas. Much longer slow down almost like regular driving and then it goes to regular slow down. I have not been able to determine a specific situation where it is duplicated.

 

[DRJJJJJ]

I have experienced the same inconsistency and it was on flat areas. Much longer slow down almost like regular driving and then it goes to regular slow down. I have not been able to determine a specific situation where it is duplicated.

Glad to know it’s just not my vehicle, but still a bit frustrating!

 

[hack-e]

I found that 1PD in unbridled was so aggressive it brought in the anti-lock brakes, not good. Running in engage mode was the best on the icy hill it would slow down faster and more consistently than I could with the brakes.

This is interesting. I haven't noticed any difference in 1PD regen among all 3 driving modes when stopping without ice. I have a flat place I come to a stop with 1PD regen from 50mph every weekday and there is a manhole cover that I use to gauge when to release cruise control so that 1PD regen will stop me right at the stop sign. And that is dead on the same no matter which of the 3 drive modes I'm in.

 

[Mach-Lee]

You will have less regen if the battery is hot or cold, or if the battery is full >95%. Stopping will also take noticeably longer if you are going downhill.

If you want to eliminate battery temperature, perform a departure time before driving the car. And don't charge above 90%.

With fall temps, people parking outside will have a cold battery and acceleration/regen will be affected.

 

[EagleDave]

I have noticed different 1PD braking, too. I think it has to do with how quickly you lift your foot off the accelerator.

If you are maintaining speed and suddenly lift your foot all the way, you will see slightly harder braking.

If you are slowly lifting your foot off the accelerator to slow down, but not brake, and then you lift your foot all the way, you will see less braking.

YBMV (your braking may vary)

(This all assumes no ice)

 

[Fixbear]

Right, and I try only use the accelerator pedal. When I release it stops relatively quickly 80% of time and other times it does not and I have to engage the brake. Trying to figure out why so I can better train myself.

Downgrades have a huge effect on it.

 

[Auto Motive]

I definitely notice the braking seems inconsisten. I thought possibly related to software updates. I mostly drive in unbridled mode.

Our GTPE regen works the same since
new. 17500 miles always on whisper mode.
The model y also very simular in regen.

 

[DennisD]

You are correct. Everyone was stopping fast on an exit ramp, on ice. I took my foot off the gas, effectively “breaking hard”. I was sliding. I had no control. I did’t do this, but logically the way to break less hard would be to step on the gas, which is counterintuitive and I did not do that.

The same thing would have happened with traditional 2 pedal driving had I hit the brakes hard, but I would not have. I would have let off the gas and applied the brakes in a more controlled way. In the few seconds where it all happened there wasn’t an obvious way to regain control. It was my error, but it was a situation that I wouldn’t want to happen again. I don’t recall any antilock breaks kicking in. I just thought I was going to smash my car and the car ahead of me. I veered left enough just in time to come up next to the car ahead of me. And luckily didn’t get into the lane on the highway.

It all worked out, but because of that event and the differences between traditional 2 pedal driving and 1 pedal, I didn’t want to test it again. Everything was different than every other experience in 30 years of driving. For me, going back to 2 pedal made more sense. Prior to that, I liked 1PD and did not consider changing back.

I noticed that you quoted "breaking" and that was making me smile every time I read it in earlier posts as well.

I am thinking if they are "breaking" and not braking, this would cause real damage to the car in both 1 pedal and 2 pedal modes.

I am just being a smart ass but it did make me chuckle when they were describing it as breaking (destroying) their car and wondering why it was inconsistent.

 

[Auto Motive]

I noticed that you quoted "breaking" and that was making me smile every time I read it in earlier posts as well.

I am thinking if they are "breaking" and not braking, this would cause real damage to the car in both 1 pedal and 2 pedal modes.

I am just being a smart ass but it did make me chuckle when they were describing it as breaking (destroying) their car and wondering why it was inconsistent.

3 paragraphs and like george and jerry its about nothing. Just kind of funny.

 

[DennisD]

3 paragraphs and like george and jerry its about nothing. Just kind of funny.

 

[ctenidae]

After thinking about this, and testing a little today, I think the system regulates the amount of regen based on how you lift off and the conditions around you. When I lift off fully and suddenly it slows more aggressively, perhaps anticipating an emergency stop. When I lift off a little, then lift off entirely it slows down much more gently, perhaps letting the car's sensors dictate regen rate. Open road regen was more gentle than in traffic.

I think the programming on how it decides how to modulate regen needs some tuning - it's not, I suspect, very consistent, with deviations from the expected very noticeable since you may have to go to the brake pedal. It's another part of 1PD that takes getting used to, but this kind of friction makes it a little tougher to do. Tesla has an advantage with so much more driver data and development time, but everyone else will catch up soon enough. Hopefully.

Sponsored