Uncontrolled/Unintended Acceleration on 2023 MME while using single pedal drive **SAFETY ISSUE**

DonM

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I have TWO 2024 Premium AWD Long Range Mach-E's: One Eruption Green, one White
in my area there are a lot of hills, when using 1 pedal i am always using pedal or it comes to a stop, 2 pedals my car glides down the hills ….am I using less power when gliding down vs 1 pedal?
If you ever touch the brake pedal, there is a chance it will engage the friction brake. Also, if you let cruise control slow you down and stop, it often uses the friction brake (because it often starts slowing too late). It seems to me that manual 1-pedal driving while never touching the brake pedal would give you optimal regen.
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NorthlandPhil

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I REALLY REALLY wanted to like 1 pedal drive, I tried it with both mach e's and I just didn't like it. To me it feels like surrendering too much control over driving and increases potential inattention. It's only my opinion and apparently I'm one of the few that thinks this way.
You’re not alone, and I believe as more and more of the general population drive EVs, the higher the percentage of EV drivers who don’t care for OPD.

while I wouldn’t say “REALLY REALLY” I did think I’d like it more. Turns out what I really like is smooth deceleration along with some coasting. 17-year-old Me would have really really liked it, no doubt. ?
 

NorthlandPhil

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If you ever touch the brake pedal, there is a chance it will engage the friction brake. Also, if you let cruise control slow you down and stop, it often uses the friction brake (because it often starts slowing too late). It seems to me that manual 1-pedal driving while never touching the brake pedal would give you optimal regen.
But regen isn’t the most efficient way to stop. Coasting is. While completely coasting to a stop isn’t practical, a blend of coasting and regenerative braking is. In theory, any driver could drive just as efficiently in either mode. In practice few drivers have the skill and inclination to do that.

I think an interesting study would be one that involves drivers who drive in the mode they prefer and see how the results compare. Pretty sure it would confirm YMMV. And that awareness of how your braking can improve your experience.

Besides, from what I’ve seen and read Ford did a better job on regenerative braking than to cause friction brakes to be applied by just touching the pedal.
 
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Kamuelaflyer

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But regen isn’t the most efficient way to stop. Coasting is.
About 3 years ago I posted a series of data points here on repeated descents down a road of a known distance (7 miles) using both 2pd and 1pd. There was no discernable difference between the two in any drive mode. The starting point was at 4900 ft msl and the end was at roughly 2500 ft msl. It's all downhill averaging over 6% grade with no uphill in any section.
 

NorthlandPhil

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About 3 years ago I posted a series of data points here on repeated descents down a road of a known distance (7 miles) using both 2pd and 1pd. There was no discernable difference between the two in any drive mode. The starting point was at 4900 ft msl and the end was at roughly 2500 ft msl. It's all downhill averaging over 6% grade with no uphill in any section.
The fact that results were essentially the same in all modes, I think, indicates Ford did a good job in designing and implementing regenerative braking, as well as one pedal drive. No discernible difference. No one should feel they need to use OPD for the “best experience”. (With 6% grade I’d guess a lot more braking than coasting or accelerating in that test.)

YMMV because how aggressively one brakes does matter. But, again, other than the outliers, the difference probably isn’t all that great. Use OPD if you like it, turn it off if you don’t.
 


Kamuelaflyer

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With 6% grade I’d guess a lot more braking than coasting or accelerating in that test
The testing was done with a few things in mind and included driving it in ACC at speed limit plus 7 (67 mph). I did the same in 1pd, then 2pd and finally coasting until I winced then braking down to 60 then letting it go again. Wash, Rinse, repeat. The variable was only the depleted electrons as the climb back up that hill takes 10% soc. I did it late on a Sunday afternoon in mid month before Hawaii County’s finest start getting nervous about their month-end ticket quotas.
 

RickMachE

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But regen isn’t the most efficient way to stop. Coasting is. While completely coasting to a stop isn’t practical, a blend of coasting and regenerative braking is. In theory, any driver could drive just as efficiently in either mode. In practice few drivers have the skill and inclination to do that.

I think an interesting study would be one that involves drivers who drive in the mode they prefer and see how the results compare. Pretty sure it would confirm YMMV. And that awareness of how your braking can improve your experience.

Besides, from what I’ve seen and read Ford did a better job on regenerative braking than to cause friction brakes to be applied by just touching the pedal.
You seem to miss the fact that there is no "coasting". If you remove your foot from the accelerator, regen takes place. How aggressive it is depends on the drive mode. If you turn the dial to N, you will feel what no regen feels like.
 

NorthlandPhil

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You seem to miss the fact that there is no "coasting". If you remove your foot from the accelerator, regen takes place. How aggressive it is depends on the drive mode. If you turn the dial to N, you will feel what no regen feels like.
Good point. I don’t have a good number for regen efficiency, but my understanding is that it recovers about 70% of kinetic energy (?). Overall efficiency isn’t improved by making it more aggressive, that just makes you decelerate faster.
 

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If you ever touch the brake pedal, there is a chance it will engage the friction brake.
If you ever release pressure from the accelerator in 1PD to slow down, there is a chance it will engage the friction brakes.
It seems to me that manual 1-pedal driving while never touching the brake pedal would give you optimal regen.
Incorrect, because 1PD and 2PD both use the exact same blended regen/friction braking system.
 

DonM

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I have TWO 2024 Premium AWD Long Range Mach-E's: One Eruption Green, one White
If you ever release pressure from the accelerator in 1PD to slow down, there is a chance it will engage the friction brakes.

Incorrect, because 1PD and 2PD both use the exact same blended regen/friction braking system.
Wow that’s terrible. There’s no good reason I can think of to use the friction brake when you take your foot off the pedal unless it detects an obstacle. Why would it do that instead of just using regen like Tesla does? It’s a waste of energy.
 

superdave80

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You seem to miss the fact that there is no "coasting". If you remove your foot from the accelerator, regen takes place.
When I'm in Whisper, I swear I don't feel any regen, and my car will coast for a long, long time on a flat road. When my car randomly decides to switch to another mode, I definitely feel the regen. Has anyone ever confirmed via connecting to the car that there is or isn't regen in Whisper mode?
 

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Slow to a stop or almost stop, then slightly press the accelerator to move forward slowly, take foot off but the car keeps accelerating.
Keeps accelerating or keeps moving? Take your foot off the power pedal, and the car does not stop moving immediately. Regen gradually brings the car to a stop, but not immediately. When parking, the driver needs to be aware of the time that regen needs and plan accordingly.
 

superdave80

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Wow that’s terrible. There’s no good reason I can think of to use the friction brake when you take your foot off the pedal unless it detects an obstacle. Why would it do that instead of just using regen like Tesla does? It’s a waste of energy.
If you believe that taking you foot off of the accelerator in 1PD shouldn't activate friction brakes (and only use regen), then why do you believe pressing the brake in 2PD SHOULD activate friction brakes instead of regen? In both situations, the driver has indicated that they want to slow down, either by taking their foot off of the accelerator or by pressing the brake.
 

RickMachE

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When I'm in Whisper, I swear I don't feel any regen, and my car will coast for a long, long time on a flat road. When my car randomly decides to switch to another mode, I definitely feel the regen. Has anyone ever confirmed via connecting to the car that there is or isn't regen in Whisper mode?
When you are in Whisper, shift to N. Then you will know that there is regen in Whisper. Or, read the manual where it stays it slows.
 

fleeps

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Has anyone ever confirmed via connecting to the car that there is or isn't regen in Whisper mode?
There absolutey is regen in Whisper mode. Use CarScanner app to see how much regen you get.
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