Mach E refused Unbridled mode - too hot?

[JohnFoxeSheets]

So, if the calibrations temporarily disabled Unbridled due to a hot battery then why leave 1PD enabled as well? Doesn't make sense to me.

I would guess that Ford considers 1PD to be a safety feature and disabling it, even with a message, might lead to accidents. Seems crazy to me, but I recall reading of at least one member here who either (nearly?) crashed because 1PD was unexpectedly turned off. ?‍

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[RidingwithScotty]

@JohnFoxeSheets My 1PD has only been turned off by OTA updates resetting everything or those rare occasions when I do it manually in order to brave the carwash to clean Scotty’s under carriage…don’t know what else would cause 1PD to spontaneously turn off besides the update bug (which is still ridiculous IMHO) ?‍

 

[Mach 5e]

Yesterday I decided to go for a cruise in 100 degree heat. My car refused to let me switch to Unbridled mode for a good long time, and I suspect the extreme heat caused the car to take that mode off the table until things cooled down. Later in the trip I was able to switch, but not before the outside temperature readings had declilned significantly. Has anyone else experienced this, or was this just a glitch?

Drive mode switched on me for the first time in 10,000 miles, AFTER the buggy POS Update last week. I'm in Honolulu and it's always hot hot and never was an issue. If FORD is neutering our power down at every turn to save their ass on warranty issues due to the disconnect and battery bottleneck issues, they deserve another class action suit. FORD, start being more honest about what is going on when we trusted you.

 

[JoeDimwit]

One pedal driving adds a significant load to the power electrics. The battery can’t take all the regen juice. So it has to burn off that energy as heat. So sounds like the system couldn’t handle the heat rejection required under it’s condition.

Regen returns less energy to the battery than acceleration depletes from the battery. If the battery can support current out, it shouldn’t have an issue with current back in.

 

[Space Ghost GT]

Regen returns less energy to the battery than acceleration depletes from the battery. If the battery can support current out, it shouldn’t have an issue with current back in.

That’s not how batteries work due to C limits. You can draw 1000 amps from the battery right. Can you charge the battery at 1000 amps? Definitely not, unless you like fireworks. You’d need a super capacitor bank to recapture all the energy from regen. Too much juice too fast for the battery to handle.

 

[SnBGC]

That’s not how batteries work due to C limits. You can draw 1000 amps from the battery right. Can you charge the battery at 1000 amps? Definitely not, unless you like fireworks. You’d need a super capacitor bank to recapture all the energy from regen. Too much juice too fast for the battery to handle.

If I understand things correctly, amps is one thing but the voltage differential also needs to be great enough for adequate energy transfer. The torque created via regen is actually part friction torque and part electrical torque (or torque due to current flowing through the motor). Only the electrical torque can be harnessed and stored. Does that sound about right?

 

[Space Ghost GT]

If I understand things correctly, amps is one thing but the voltage differential also needs to be great enough for adequate energy transfer. The torque created via regen is actually part friction torque and part electrical torque (or torque due to current flowing through the motor). Only the electrical torque can be harnessed and stored. Does that sound about right?

Yes you are converting kinetic energy into electricity via the motor turned generator. You are also having to convert the a/c power generated and convert it to DC for the battery to make use of it. Energy is always complete lost and wasted when the friction brakes are applied. That would be the only frictional torque component (besides negligible losses from wheel bearings) There are still losses from the regenerative system due to limits of the power electronics and battery ie resistance which make them 70%ish efficient in stopping the car VS zero compared to the friction brakes. So if you regen a lot in stop and go traffic or long downhill descents or very hilly terrain. You are putting a lot of load/heat on/in the power electronics and the HVJB ie why one pedal gets disabled or reduced under extreme circumstances.

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