Search found 27 matches

by PetriK
Aug 28 2011 2:38am
Forum: E-Bike Technical
Topic: Found adjustable CCCV charger
Replies: 59
Views: 6285

Re: Found adjustable CCCV charger

I have had one of these too for some months and have used the voltage adjustment to optimize the volts for my pack depending on the need.

Only today found this post, so:

The middle adjustment you say is charge current ?

And the third is for ?
by PetriK
May 22 2011 8:55am
Forum: E-Bike Technical
Topic: 2 speed shifting tranny
Replies: 32
Views: 2682

Re: 2 speed shifting tranny

Interesting idea. I have fixed some motorcycle trannies and those are really heavy duty stuff to be able to manage up to a few hudred of horsepower. I dont know how you planned to organize the shifters to move the gears. Somekind onf shifter drum like in the original gearbox ? If this is the 250cc n...
by PetriK
May 22 2011 8:48am
Forum: E-Bike Technical
Topic: Keywin E-bike Lab Parameter Designer Software Manual-ver 1.2
Replies: 98
Views: 74067

Re: Keywin E-bike Lab Parameter Designer Software Manual-ver

The three mode speed setting in pedelec seems to work only up to 100%. if 120% is used, then the throttle must be used for increasing the speed for over 100% area. I like the pedelec mode so that its max 100% that i can get by pedalling, but 120% with a push a button eg when doing a steep uphill (i ...
by PetriK
May 18 2011 12:14am
Forum: E-Bike Technical
Topic: XPD: open-source keywin e-bike lab replacement
Replies: 600
Views: 127181

Re: XPD: open-source keywin e-bike lab replacement

Thx, my chinese interface does not have a flash button as its referred in the text.

I assume the usb is providing +5v and gnd in addition to tx/rx, so there may even be room for one additional wire for reset ?
by PetriK
May 17 2011 1:27pm
Forum: E-Bike Technical
Topic: Best 250W HUB motor (small, light & freewheeling)
Replies: 11
Views: 4430

Re: Best 250W HUB motor (small, light & freewheeling)

I only have experience of two geared hub motors, but is there really difference in frewwheeling ability ? The basic design is the same meaning that there is three reduction gears bringing about the same loss. No significant differences between different bearings. Am I missing something in the equati...
by PetriK
May 17 2011 1:21pm
Forum: E-Bike Technical
Topic: XPD: open-source keywin e-bike lab replacement
Replies: 600
Views: 127181

Re: XPD: open-source keywin e-bike lab replacement

Very good info, thanks for sharing it !!! I am just wondering about two things: 1) hows the speed 1,2,3 settings. Did not get that formula from the spec ? 2) hows the checksum exactly calculated ? Sum of elements negated ? Been hacking several engine management protocols in past, therefore intereste...
by PetriK
May 15 2011 2:44pm
Forum: E-Bike Technical
Topic: Two-Speed Regen
Replies: 25
Views: 2755

Re: Two-Speed Regen

Noticed that you had used 115% as maximum setting. When I try to set anything above 100% all the values in the configuration file are not anymore updated and are ignored from user interface.

Does the values over 100% really work regardless of the above ?
by PetriK
May 15 2011 2:18pm
Forum: E-Bike Technical
Topic: hydraulic brakes and regen ?
Replies: 10
Views: 1333

Re: hydraulic brakes and regen ?

Added EB to GND but no wiring to EBS pins yet. Tested today and it feels like having the mode switch in a lower setting (33%) when doing downhill there is more "enginebraking". With mode switch at 100% there is virtually no enginebraking. My wattsup is in a position where its difficult to read it so...
by PetriK
May 07 2011 4:10pm
Forum: E-Bike Technical
Topic: Two-Speed Regen
Replies: 25
Views: 2755

Re: Two-Speed Regen

Great info, thanks for this- did not know that you can use regen in passive mode without excessive drag. Need to test this and check the effect to average speed on my ordinary route.
by PetriK
May 07 2011 3:55pm
Forum: E-Bike Technical
Topic: hydraulic brakes and regen ?
Replies: 10
Views: 1333

Re: hydraulic brakes and regen ?

Yes, youre absolutely right - left lever takes power off completely with a moroncycle ;), also usually i swap the levers so to that right lever is always front brske. Been thinking of replacing the rear brake with regen to the left lever- but i need the rear brake to keep the bike still at trafic li...
by PetriK
May 07 2011 3:36pm
Forum: E-Bike Technical
Topic: hydraulic brakes and regen ?
Replies: 10
Views: 1333

Re: hydraulic brakes and regen ?

Yep, been thinking the same- adding a push button. Anyhow it does not feel right as an active motorcyclist my emergency procedure is to use the brake levers - and the engine is not shut off when depressing the brake lever.

There must be a better way... ?
by PetriK
May 06 2011 12:42pm
Forum: E-Bike Technical
Topic: hydraulic brakes and regen ?
Replies: 10
Views: 1333

hydraulic brakes and regen ?

Would like to make regen to work, or even more importantly cut the power off when brake lever is depressed. So far have not been able to find a hydraulic bicycle brake lever that would have a switch implemented. One though occured is to put a pressure switch to the hyrdaulic line - but I am a bit un...
by PetriK
Apr 27 2011 2:15pm
Forum: E-Bike Technical
Topic: Ebike efficiency ?
Replies: 19
Views: 1270

Re: Ebike efficiency ?

Last trip according to gps and watts up 2.1ah, ~40min, 14.5km average speed 21km/h, top speed 37km/h. Peak 24Ap. Averag hr most of the time 110-130, i.e. 60% on that range so not so heavy. Its a 10ah battery, so lools like i could get some 50-60 km out of it down to 20% level. Bike is fairly light 2...
by PetriK
Apr 26 2011 10:58am
Forum: E-Bike Technical
Topic: Ebike efficiency ?
Replies: 19
Views: 1270

Re: Ebike efficiency ?

Thx, picked up tire pressure and inert mass and frontal area. On my other hobby i try to save grams for better accelearation and speed. Tires are already changed to less rolling resistance ones ( according to sales pitch ) and pumped to overpressure. Sounds like the most efficient method would be to...
by PetriK
Apr 24 2011 3:42am
Forum: E-Bike Technical
Topic: Ebike efficiency ?
Replies: 19
Views: 1270

Re: Ebike efficiency ?

I'd guesstimate that there's an overall 75% loss from the battery to the wheel. Hey, it's better than internal combustion, which is like ~20% efficient :P I hope the author meant 75% efficiency not loss... So what are the biggest loss generaring components that can be affected ? My battery switch g...
by PetriK
Apr 22 2011 4:26am
Forum: E-Bike Technical
Topic: Ebike efficiency ?
Replies: 19
Views: 1270

Re: Ebike efficiency ?

Looked at the ebikes.ca and that does not seem to include planetary gear loss into the equation. Additionally the choises are far from what I have in the bike, as product names. Motor efficiency seems to be minimum 80 up to 95 depending on sources Planetary gear efficiency seems to be around 95 to 9...
by PetriK
Apr 22 2011 1:58am
Forum: E-Bike Technical
Topic: Ebike efficiency ?
Replies: 19
Views: 1270

Re: Ebike efficiency ?

Our dyno has a 450kg drum and eddy currrent brake. In practise the load from dyno is too big to have more than around 0.5hp tolerance, which may be as much as this motor gives out.

Thanks for the ebikes.ca hint.
by PetriK
Apr 21 2011 1:03pm
Forum: E-Bike Technical
Topic: Wich controller for 250w pedelec / 1000w throttle?
Replies: 10
Views: 948

Re: Wich controller for 250w pedelec / 1000w throttle?

I choose infenion for the switchability. Really like the pedelec over throttle on a full suspension mtb. This summer wil show if the reliability is there. The question i have if the 250w EU limit is in to the controller, in to the motor or out of the wheel ? My 250w motor takes in to the controller ...
by PetriK
Apr 21 2011 12:49pm
Forum: E-Bike Technical
Topic: Ebike efficiency ?
Replies: 19
Views: 1270

Ebike efficiency ?

My watts up shows 850w in to the controller, just trying to figure out how much power to the wheel to estimate comparable kilowatts/horsepower number ? Infenion Controller efficiency ? Bafang hub motor efficiency ? Bagang internal gear loss ? Wiring loss from controller to motor ? Maybe e.g. 90x90x8...
by PetriK
Apr 10 2011 10:54am
Forum: E-Bike Technical
Topic: Installing pas sensor on sprocket side...
Replies: 6
Views: 2500

Re: Installing pas sensor on sprocket side...

yes, i thought there is no difference either and its only because my wheel is somewhat uneven - until saw a signal from a motorcycle cam sensor that had been installed 180degrees of. During these 2 months I have tried several pas sensors, magnets with reversed polarity for some magnets on the wheel ...
by PetriK
Apr 09 2011 12:00pm
Forum: E-Bike Technical
Topic: Installing pas sensor on sprocket side...
Replies: 6
Views: 2500

Installing pas sensor on sprocket side...

Would guess that most readers here are less interested about pas, but its my preference for two reasons: 1) local eu laws reques using one 2) it gives a smooth response to pedalling in terrain Now to the point that thought to be worth of sharing... During last 2 months i have been struggling to get ...
by PetriK
Feb 24 2011 9:36am
Forum: E-Bike Technical
Topic: Bent bafang rear axle ?
Replies: 5
Views: 625

Re: Bent bafang rear axle ?

OK - thanks. I did initially misthreaded the freewheel sprocket set when installing - so sounds like I need a new motor, repairing the threading is not really possible. Did a testride today, the intermittent "crunching" sound from the motor was indeed a loose connector as today the bike was running ...
by PetriK
Feb 23 2011 1:17pm
Forum: E-Bike Technical
Topic: Bent bafang rear axle ?
Replies: 5
Views: 625

Bent bafang rear axle ?

Finally got the bike running and made a short trip (8km) in -15C weather. On the way back noticed that there was a problem to start the motor on the way back and keep it running. Got a really bad noise, almost like brakeing a gear - but believe that this was due to a loose motor phase wire connector...
by PetriK
Feb 23 2011 7:25am
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1850
Views: 603994

Re: Your Creation's Before & After Pics

Image

pedelec: bafang 250w rear hub motor, 36V10Ah battery, Xie-Chang programmable controller
by PetriK
Nov 22 2010 2:20pm
Forum: E-Bike Technical
Topic: KU61 controller from BMSBattery - some info and a question
Replies: 1
Views: 588

Re: KU61 controller from BMSBattery - some info and a questi

Just realized how the little frog batteryholder has just a good place for the controller. Very well kept "secret", as I really was wondering where to hide the controller. http://macmadigan.no-ip.com/ebike/littlefrog_battery_1_small.jpg http://macmadigan.no-ip.com/ebike/littlefrog_battery_2_small.jpg