search

BotoX / xiaomi-m365-firmware-patcher

Automatize patching of Xiaomi Mijia M365 electric scooter firmware
https://m365.botox.bz
412 stars 108 forks source link

Beta: "Speed control params" not equal to default (non beta) "power constant" #71

Open Nojevah opened 5 years ago

Nojevah commented 5 years ago

I've done comparison tests with another scooter (side by side, nearly same weight) and there was a difference, then I checked speed with m365 Tools app, and the difference is confirmed.

My settings: default firmware: 1.3.8; vmax 30km/h; Motor power constant: 42000 beta firmware: 1.3.8; vmax 30km/h; max battery current: 21000; max phase current: 42000 So all in all, it should be the same or beta slightly quickest.

In general, in the same straight line: With default firmware, I'm between 28 and 29 km/h With beta firmware, I'm between 27,4 and 28,4 km/h and it looks like acceleration is not as powerful (but no evidence, so subject to bias)

I've tried another firmware with beta: 1.3.8 vmax 31km/h; max battery current: 15000; max phase current: 30000. With this one, I'm between 28,4 and 29,4 km/h. But I can't use it, since at the end of the ride my battery can't reach vmax so I have the classical jolt (despite using low acceleration settings).

Do you think it could be possible to allow intermediate Vmax like 30,5 or even a new bigger constant like: 3000 = 30km/h; 3200 = 32km/h etc. ?

BotoX commented 5 years ago

There is an acceleration constant which can provide more power at speeds close to the max. The beta current limits are used for this: Vdelta = speed_want - speed_cur Current = Vdelta * acceleration If current > max_current: current = max_current

So when the two speeds are close the delta is small and the current isn't big enough. So I guess a patch should be added to improve this But making this acceleration value larger also makes the throttle less smooth I think, gotta try

Nojevah commented 5 years ago

Thanks for this detailed answer. In my case, "acceleration" is not what I'm searching. My goal is really to have the max possible value for "speed_want", considering at the end of the ride, my battery will be around 38,70 V. So if instead of 30 or 31km/h, I could use something like 30,5 I think it would match default firmware (and maybe use slightly less battery since less acceleration).