Thanks, so much!Another possibility for the bike spontaneously starting up is that you have a fault on your wiring somewhere, in particular, the throttle signal wire.
Iit can also happen when the throttle stop is broken. You only get zero throttle when the low magnet is positioned exactly next to the hall sensor inside the throttle. It should be held there by a plastic stop, but the stop sometimes breaks and lets it past. You should be able to test that. When you switch on, the throttle won't work until the controller sees zero throttle, so if it's a bit out of position, nothing unusual happens. When you open the throttle, you go past the zero position, at which point the throttle is activated and will work normally until you let go of it and the return spring pushes it past the sensor instead of sitting on the stop. It then continues to give power when it's in its resting position and you have to twist it a bit forward to get zero.
Cheapest solution. Cut the sensor off this.Thanks, so much!
Could you let me kow the exact name part for the speed sensor please?
I would lime to buy it in ebay.
Thanks!
I am amazed about al your knoledge.
Belén
Yes, it has a run on after pedalling, but intermitent, so start and stop different times abruptly and strongly. And after using the rear wheel brake when I release it, starts speeding abruptly for a while. So if I am at the traffic lights and release the brake becomes a problem. Scary.I had something similar with one of my first electric bikes 10 years ago. I can't remember all the details, but it goes something like this. There is a run-on after you stop pedalling when using the pedal sensor - maybe 2 or 3 seconds. The throttle and brakes over-ride this run-on, but it's like the controller remembers it should be there, so reactivates it after you let go of the throttle or brake as if you hadn't used them. It will run-on up to the same time (2 or 3 secs) after you last pedalled.
So, the first question is, do you get any run-on from the motor after you stop pedalling?
You can sort out the speed display by adding a speed sensor. If you have an old cycle computer, you can cut the sensor off it, or you can buy a cycle computer from Ebay for about £3 and cut off its sensor. The sensors have two wires. You connect one to the white wire that goes into the controller from the motor connector, and the other wire connects to any ground (black). Occasionally, some controllers work the other way round, so you connect the second wire to a red 5v instead of ground. You have to try it to see which way works. No harm will come if you connect the wrong way round. It just won't work like that.
Hi VFR,Cheapest solution. Cut the sensor off this.
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Proper Ebike sensor has longer and more robust cable. Cut the connector off. red to red 5v, black to black ground and signal wire to white wire.
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Whichever one you use the magnet has to come close to the sensor, so you sometimes need to put some packing underneath it to hold it closer.