EV Automatic Gearbox Controller Project

[P-hack]

It was stated early on in the first video that part of the diligence here is in verifying claims of inefficiency in an automatic-electric conversion. So props for that (though they are pretty well understood). A little amusing that spinning this transmission unloaded at that speed would burn out my only EV motor in short order (yes it is a bike)

[ConnClark]

A free spinning electric motor uses very little power. I don't see how it would burn your motor out other than normal wear and tear.

[P-hack]

with the transmission in neutral his motor was drawing 64 amps @ 24 volts. Since he isn't dictating, you kinda need to watch the videos to play along here

[ConnClark]

sorry, I'm stuck at a silent computer.

[P-hack]

$5 earbuds from walgreens?

Originally Posted by P-hack

Do you already have some idea what the electrical pins do for controlling it?

retracted, watched the video in post 2, you are all over it.

[P-hack]

Just a note since other people are doing the same sort of thing as the position switch, to minimize the possibility of fudgy readings, using the midpoint between readings is useful:
readings sorted by value and midpoints:

n 643
  635
2 627
  605
p 584
  550
r 515
  441
3 368
  346
d 323
  207
4 91

so a function like this should be fairly reliable and allow for a bit of switch/connection degradation:

//map the position switch resistor reading to an actual position
int position(val){
  if(val > 700)
    return ERROR;
  if(val > 635)
    return NEUTRAL;
  if(val > 605)
    return SECOND;
  if(val > 550)
    return PARK;
  if(val > 441)
    return REVERSE;
  if(val > 346)
    return THIRD;
  if(val > 207)
    return DRIVE;
  return FOURTH;
}

[jackbauer]

Thanks for the comments guys. Working on the code now. Lot of this is gonna be trial and error as the finer points of how the pressure regulator valves are applied is not well documented. Nor is even if the valves run at 5v or 12v. So I'm starting at 5v. More updates soon.

[P-hack]

Sorry if this is obvious, but if you know of an existing vehicle with this trans, then maybe you could borrow it and scope the waveforms? With a ready made adapter harness no less.

[dddvvv]

Hey damien, maybe this might help.

Its a link to the 2003 range rover service manual, which uses this same transmission. More detailed on the transmission chapter, than the regular 5hp24 manual.

cant post a link with under 5 posts to my name.

Google search " 2002 range rover workshop manual"

[jakobnev]

That chart P-hack posted gave me an idea: Just having the torque converter between the motor and differential. (One that has lock-up preferredly)