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I've trimmed it down to just be the crash, looks like I had a massive current / power spike even though i'd slowed down

crash.xlsx

/edit which in turn set the battery to 0, and probably caused it to throw me

Edited by Cannings
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30 minutes ago, Cannings said:

I've trimmed it down to just be the crash, looks like I had a massive current / power spike even though i'd slowed down

crash.xlsx

/edit which in turn set the battery to 0, and probably caused it to throw me

Thanks. Seems like something stopped/blocked the wheel -> current goes up and voltage down. Some stone, branch or similar?

With the high current and lower voltage the limit is reached were the motor cannot produce more torque -> the wheel tilts forward (speed goes down)

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Just now, Pard said:

Well done wearing the right gear!  Really saved you.

 

Definitely saved my face, I think the helmet is okay to carry on being used but my jacket is ripped in places, so i'm going to look to get a motorcycle jacket instead a bit sturdier

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In all honesty I only had snowboarding gloves on, I wasn't wearing my wrist guards as I guess i've become a little complacent, but the bruises are mainly my elbow and shoulder anyway, thus the padding in the new jacket lol

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1 minute ago, Cannings said:

In all honesty I only had snowboarding gloves on, I wasn't wearing my wrist guards as I guess i've become a little complacent, but the bruises are mainly my elbow and shoulder anyway, thus the padding in the new jacket lol

Indeed.  It is so easy to get complacent on these wheels.  

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Glad you are OK. As others have said already you have proven the worth of a full face helmet (very nice helmet it is too!) I agree with the consensus that you struck  something or pulled something into the wheel well that increased rotational resistance. Your speed dropped 10mph/kph in an instant and the current draw went through the roof. Amazing to see the voltage drop in this circumstance. Remind me of your wheel type and battery size? This is the value of logging every ride. The forensics are invaluable. While you had a nasty spill you can be confident from the data that the wheel did its best to keep you upright and this was not a cut out. I would however open it up and look for any heat damage to the wires and components. The current surge was brief... But extreme. 

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3 hours ago, WARPed1701D said:

I would however open it up and look for any heat damage to the wires and components. The current surge was brief... But extreme. 

Heat damage that fast? If anything, the current would have fried a mosfet. As that didn't happen...

But can't hurt to have a look whether everything looks alright anyway!

Edited by meepmeepmayer
grammar
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full face! glad the tsg did its job. you might want to consider kneepads, too... you're lucky you didn't smash them. i flew off about 2 months ago and both knees were baaaanged up. stupid because i own a pair. ride on!

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16 hours ago, WARPed1701D said:

Glad you are OK. As others have said already you have proven the worth of a full face helmet (very nice helmet it is too!) I agree with the consensus that you struck  something or pulled something into the wheel well that increased rotational resistance. Your speed dropped 10mph/kph in an instant and the current draw went through the roof. Amazing to see the voltage drop in this circumstance. Remind me of your wheel type and battery size? This is the value of logging every ride. The forensics are invaluable. While you had a nasty spill you can be confident from the data that the wheel did its best to keep you upright and this was not a cut out. I would however open it up and look for any heat damage to the wires and components. The current surge was brief... But extreme. 

I have the 1020w tesla, I had a look around the pavement on my way home and all I could see was dip in the pavement not too deep, but I guess it could have been me accelerating out the turn I had just made into the business park and catching the far edge of this dip perfectly which sent my weight well forward to begin with, then the wheel thinking that weight shift was me saying gogogogogogo and then going pop, thats all I can think of

9 hours ago, kour said:

full face! glad the tsg did its job. you might want to consider kneepads, too... you're lucky you didn't smash them. i flew off about 2 months ago and both knees were baaaanged up. stupid because i own a pair. ride on!

Yeah, the new trousers I just bought come with knee pads built in, and the jacket has shoulder and elbow pads so hopefully should be a lot better protected after that, the TSG was fantastic as I really did come down face first, and after inspection just a few scratches to the front, and to the visor (which I have a spare for) means thank goodness I don't need to replace the whole helmet either

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On 4.4.2018 at 9:02 AM, Cannings said:

I've trimmed it down to just be the crash, looks like I had a massive current / power spike even though i'd slowed down

crash.xlsx

/edit which in turn set the battery to 0, and probably caused it to throw me

It protected your battery. But this is not a safety (overall) behaviour to deal with this issue. On a proper design a treshold would cause a warning/ limitation that you don‘t get in an unsafe condition. 

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9 hours ago, OliverH said:

It protected your battery. But this is not a safety (overall) behaviour to deal with this issue. On a proper design a treshold would cause a warning/ limitation that you don‘t get in an unsafe condition. 

Why do you say it protected the battery. I see that a huge current draw and massive voltage drop but no loss of power supply to suggest the BMS or mainboard cut the power. 

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