Regen Effectiveness

[Deleted member 1483]

I would like to see if Low gear actually tries to keep everything low gear when going forward. My instinct is no. It just feels like you need more throttle, if anything. It doesn’t seem to hurt though.

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[GPSMan]

There is no "low" gear.
The hybrid has one 3-way power split device.

Low only changes the software to brake more strongly when coasting, going down hills, etc.

 

[Deleted member 1483]

I know it doesn’t have a low range gear. However it does have real gear ratios in transmission. See https://www.sae.org/news/2022/04/engineering-fords-new-hf45-hybrid-transmission

My question was if using throttle when set to low actually prefers torque compared to when not using low. I’m thinking “no” based on experience but it does have a different throttle mapping at the least, and doesn’t seem to cause any harm.

 

[GPSMan]

I know it doesn’t have a low range gear. However it does have real gear ratios in transmission. See https://www.sae.org/news/2022/04/engineering-fords-new-hf45-hybrid-transmission

My question was if using throttle when set to low actually prefers torque compared to when not using low. I’m thinking “no” based on experience but it does have a different throttle mapping at the least, and doesn’t seem to cause any harm.

Thanks for the link to the article. I read it but don't see how it related to your question.

Tow/Haul mode will increase engine RPM at lower speeds to provide more power at lower speeds. I think your instinct is correct, "L" mode does not do this. At least not appreciably.

The "gear ratio" between the motor and generator is 1:1.

The "gear ratio" between the wheels and traction motor is 1 mph = 125 rpm but I have not figured how many rpm of the wheels equals 1 mph.

 

[MakinDoForNow]

Not sure where to post this, so posting it here:

I am not as light footed as you as I usually can get only 6.5-7 total miles at 975+ mpg

 

[MakinDoForNow]

Thanks for the link to the article. I read it but don't see how it related to your question.

Tow/Haul mode will increase engine RPM at lower speeds to provide more power at lower speeds. I think your instinct is correct, "L" mode does not do this. At least not appreciably.

The "gear ratio" between the motor and generator is 1:1.

The "gear ratio" between the wheels and traction motor is 1 mph = 125 rpm but I have not figured how many rpm of the wheels equals 1 mph.

Forgive me if I err but would not the rpm of the wheels be 1/60 the of the revolutions of your tire size per mile when mounted on rim width and at tested pressure. I have not double checked but I believe my Michelin primacy on my lariat was either 704-706 revolutions per mile. Don't remember if 50psi was test pressure or max rated psi, but believe later.

 

[GPSMan]

I don't do math this late at night, but tire pressure is not the variable some people think it is.

A 50 psi tire may approximately resemble a circle (still a small flat spot on the ground).

A 15 psi tire may look a different shape with larger flat spot on the ground.

But in BOTH cases the distance traveled will be the same. This is true because in BOTH cases the length of tread stays the same.

In both cases you can visualize the tire tread like the changeable shape of the tread on a tank or caterpillar bull dozer.

You need to think of the tread side of the tire as a perimeter, a piece of rope or cord of fixed length.

Tires don't appreciably stretch with changes in air pressure. Feel free to measure an unmounted tire some time.

Can it change by 1 mm? Maybe.

 

[AutobahnSHO]

I was coasting Friday in Slippery down a steep hill and hit "L" and heard the motor start making noise- engine braking.

So L is more than just lots of regen!

 

[GPSMan]

I was coasting Friday in Slippery down a steep hill and hit "L" and heard the motor start making noise- engine braking.

So L is more than just lots of regen!

Exactly.

And if you didn't press L and pressed the brake instead, after a few seconds the engine would have revved in the same manner.

This is an indication of your battery being full or close to full, and/or your need to slow was greater than regen alone can provide.

You have a maximum of 32kW of regen brake which is 42 brake horsepower. Think of it as 42 horsepower of negative torque.

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