CA speed data acting weird above 50kph

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fractal   1 kW

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CA speed data acting weird above 50kph

Post by fractal » Jul 10 2012 2:17pm

I noticed that my CA is giving me weird speed data above 50kph??? Its giving all kinds of readings and changes really fast. My pole count is right, the shunt value is right. Any ideas???
Norco A-line DH bike with :
«cromotor/hubzilla» from http://www.greyborg.com/
24s 3p Lipo (100v, 15ah)
Methods LVC/HVC cell level protection system http://www.methtek.com
24 fet infineon controller made by Lyen, heavily moded by Methods
8awg harness by Icecube57
17 inch moped rims with Michelin Gazelle tires by John Rob Holmes http://www.holmeshobbies.com
other stuff http://www.ebikes.ca

details
http://www.helicamguide.com

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amberwolf   100 GW

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Re: CA speed data acting weird above 50kph

Post by amberwolf » Jul 10 2012 4:18pm

DP version? If so, perhaps glitches in the hall signals, induced noise from phase wires since they run parallel and unshielded in most setups. Shielding the halls might fix it, or perhaps adding very small (0.1uF or less) ceramic caps to the hall lines at the controller PCB. (acutally only needed on the hall line that's running the CA speedo line)

SA version? Have sometimes had problems when magnet was in same general radius as cover bolts or disc bolts; those would sometimes false trigger the reed at higher speeds, presumably because they had just enough magnetism to retrigger it after it had been triggered and was just disconnecting after the magnet passed, whne the boltheads passed it and retriggered it. Would be intermittent and inconsistent, most of the time this happened to me. Moving the sensor a bit usually fixed it, sometimes requiring moving the magnet and sensor to a different radius than any of the bolts.

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fractal   1 kW

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Re: CA speed data acting weird above 50kph

Post by fractal » Jul 10 2012 4:25pm

DP version, will try shielding the hall wires. Thanks Amberwolf!!!
Norco A-line DH bike with :
«cromotor/hubzilla» from http://www.greyborg.com/
24s 3p Lipo (100v, 15ah)
Methods LVC/HVC cell level protection system http://www.methtek.com
24 fet infineon controller made by Lyen, heavily moded by Methods
8awg harness by Icecube57
17 inch moped rims with Michelin Gazelle tires by John Rob Holmes http://www.holmeshobbies.com
other stuff http://www.ebikes.ca

details
http://www.helicamguide.com

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MrKang   100 W

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Re: CA speed data acting weird above 50kph

Post by MrKang » Jul 28 2012 6:22am

Did the 0,1uF worked for you ?
I have the same problem ..above 52km it shows the wrong speed or goes to zero...

And if it works can you show your modification?
MrKang E-Scooter : 24V 750W Bosch Motor modified with YK-43 48V 1kW on 12S6P Lipo - top speed 44kmph
Xinling XTD800A : LYEN 4110 72V (modified for safe 100.8V with extra cooling) - 24S4P/100.8V 25Ah Turnigy + CA with Datalogger + SOUNDSYSTEM + USB power outlet + 78km top speed(120%)
MrKang Retro II : in progress.. ** 12FET MKII LYEN + 28S 20AH LifePO4 cells **
Project link [/color]: http://endless-sphere.com/forums/viewto ... 10&t=13442

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fractal   1 kW

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Re: CA speed data acting weird above 50kph

Post by fractal » Jul 28 2012 11:52am

MrKang wrote:Did the 0,1uF worked for you ?
I have the same problem ..above 52km it shows the wrong speed or goes to zero...

And if it works can you show your modification?
Turns out it stopped acting weird before I was going to do the mods!!! So I will leave it alone for now.
Norco A-line DH bike with :
«cromotor/hubzilla» from http://www.greyborg.com/
24s 3p Lipo (100v, 15ah)
Methods LVC/HVC cell level protection system http://www.methtek.com
24 fet infineon controller made by Lyen, heavily moded by Methods
8awg harness by Icecube57
17 inch moped rims with Michelin Gazelle tires by John Rob Holmes http://www.holmeshobbies.com
other stuff http://www.ebikes.ca

details
http://www.helicamguide.com

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