Regen Vibration

[Vmar21MME4x]

Hello, I have a 2021 MME Premium. I have the car over 3 years now (picked up Jan 22) and love it. My only issue is that when I charge the car to 100 percent and then drive with 1 pedal drive the car vibrates whenever I let off the accelerator. One of the only times I had the car at the dealer I told them and they said it was because of the regen brakes. It seems like it would have been a simple software update in the past 3 years but it never happened. Is this something anyone else has experienced? Is there a dealer software update for this? ( they dont seem too knowledgeable on anything EV when you ask ) Lastly before everyone jumps on saying just charge to 90 percent, I get it. But why give up 30 miles of range for something that shouldn’t be happening? It seems like the car should have a spare battery that the regen could work with.

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[Vgkfan]

I had this happen once about a month ago. Very weird, but quit after a minute or so, no issue since. Glad to know there’s an explanation, I just wrote it off as another glitch. I seldom charge to 100% so maybe that’s why it Hadn’t happened before.

 

[RickMachE]

At 100%, regen can't happen, the battery is full. Sounds like you need to clean your brake rotors.

Get to speed, then shift to N and apply the brakes. Shift to D, then return to speed. Repeat.

 

[Vgkfan]

I do that once Or twice a week, possibly I need to do it more often. However, if that was the issue, wouldn’t it continue to vibrate until the rotors were cleaned?

 

[Vmar21MME4x]

It’s definitely not dirty brakes. I have tried your method. It only happens when battery is full. Once it drops it stops. If dirty brakes were the culprit it would happen at a hard breaking event when you only get a fraction of regen. I figured it would have been a software fix that disables the regen until the battery drops to 95 percent.

 

[RickMachE]

braking...

At 100%, there is no regen, so you're using the pads like a hard braking event.

 

[MadMatt]

braking...

At 100%, there is no regen, so you're using the pads like a hard braking event.

this!

You wouldn’t notice it under a hard braking event, plus even in that situation a surprising amount of decel is still coming from the motor. It’s pretty powerful at decel when it wants to be.

Under 100% battery, 99% of your braking comes from the motors (not the brake pads.)

Honestly there should be a “brake cleaning mode” you can enable that turns off regen under the 1 pedal driving (or normal 2 pedal driving) so you can easily focus on using the brakes for an afternoon).

having to manually go into neutral all the time isn’t all that effective. Just have a yellow light on the dash (regen disabled, efficiency compromised!!).

 

[Adventureboy]

“brake cleaning mode”

Might be an opportunity for @Ford Motor Company to improve here. I have to clean the rotors on my wife's MME regularly but I never have to clean the rotors on my Lightning. The rotor metal is different and they simply rust less. Unfortunately softer metal on the MME rotors gives better braking performance at the expense of rust, so there is a trade off.

 

[Vgkfan]

braking...

At 100%, there is no regen, so you're using the pads like a hard braking event.

If I remember right, it did feel like the brakes were grabbing when I let of the pedal. I’m thinking I took 1pd off for the rest of the trip. 1pd ever since and no problem.

 

[Frankis843]

I had something similar happen the other day and it was after a charge to 100% too.
I would feel a vibration in one pedal drive mode when I would resume acceleration after regen. Had not felt it before or since.

 

[GreaseMonkey]

this!

You wouldn’t notice it under a hard braking event, plus even in that situation a surprising amount of decel is still coming from the motor. It’s pretty powerful at decel when it wants to be.

Under 100% battery, 99% of your braking comes from the motors (not the brake pads.)

Honestly there should be a “brake cleaning mode” you can enable that turns off regen under the 1 pedal driving (or normal 2 pedal driving) so you can easily focus on using the brakes for an afternoon).

having to manually go into neutral all the time isn’t all that effective. Just have a yellow light on the dash (regen disabled, efficiency compromised!!).

Yes. My brake cleaning mode is come down a very steep garage ramp in neutral on the brakes. I sometimes reverse up the ramp a few times to get them cleaned, especially after a bi-monthly hand washing.

 

[Wayne-001]

braking...

At 100%, there is no regen, so you're using the pads like a hard braking event.

I am not sure I agree with this. Starting at 100%, you are going to take energy to get up to some speed, but you are going to return less energy regenerative braking. So, I don't see how you will ever be able to regenerate to > 100%. And, 100% is just a limit for charging -- there is more battery there anyway.

I have only charged to 100% once or twice and I don't remember any difference in driving 1PD. IMO, it is the smoothest experience and something Ford designed right.

 

[MadMatt]

I am not sure I agree with this. Starting at 100%, you are going to take energy to get up to some speed, but you are going to return less energy regenerative braking. So, I don't see how you will ever be able to regenerate to > 100%. And, 100% is just a limit for charging -- there is more battery there anyway.

I have only charged to 100% once or twice and I don't remember any difference in driving 1PD. IMO, it is the smoothest experience and something Ford designed right.

it’s not that simple, Regen breaking creates a lot of Kw’s. Easily peaking at 70-80kw just by letting it off the go pedal in 1-pedal driving at higher speeds.

Notice when your fast charging, above 80-90% SoC the charge rate drops dramatically? Like well under 40kw. This is the issue, with a battery at 99% or 97% the battery just can’t safely absorb energy at a rate of 70kw, so to protect the battery the regen is limited to almost nothing and you rely on the mechanicals brakes to slow down. As your SoC goes down the potential for regen absorption goes up.

temperatures factor into this as well. A very cold or very hot battery will also trigger some protection and limit regen.

 

[MachhE-CT]

Problem solved for
Me. One I rarely charge to 100% and my wife hasn’t quite got into the one pedal groove so her profile has that turned off. So the actually brakes get used more
Even though regen is used when you use the break pedal the actual brakes
Get more use. Keeps the corrosion build up down

 

[GreaseMonkey]

Problem solved for
Me. One I rarely charge to 100% and my wife hasn’t quite got into the one pedal groove so her profile has that turned off. So the actually brakes get used more
Even though regen is used when you use the break pedal the actual brakes
Get more use. Keeps the corrosion build up down

Not how it works. No difference between drive modes (1-pd or 2-pd) in how and when the car applies regen vs mechanical brakes. Even when you hit the brake pedal the car is mostly regenerating electricity.

If you experience vibration, check the brake discs / pads. Simple as that.

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