Throttle response changed after increasing battery voltage

[Zambam]

Throttle profile battery @ 73.4 V
Moved scale on throttle for better view.
Added handle on grip for better control of throttle for the test.

 

[Zambam]

Deleted the video in post #44 (battery at 71.7V) by accident. Sorry about that.
I transcribed the readings from video above (battery at 73.4V). With higher battery voltage, throttle voltage at rest is a little higher at 0.80 V. Top speed increased by 3 KmH. Rain today- no test rides.

 

[larsb]

I'd try to single out the issue by removing all but the stuff needed for riding, like brake sensors, buttons and anything else that could cause controller errors. I've had intermittent issues like yours with a throttle wire that i strapped too short and hard to the frame, wire broke and shorted during riding after about a year, causing hickups similar to yours. I've also had similar issues caused by motor hall sensors that were starting to malfunction intermittently - so root cause could be many things.

 

[TommyCat]

 

[Zambam]

Got back from a 4 mile ride w. no throttle issues.

throttle V at rest 0.8 V

Battery after ride 73.08 V

 

[Zambam]

On the way back from a 6 mile ride, throttle acted up again. I was exiting a parking lot to the street, slowed down a bit then gave throttle when there's no response from the motor. As I was rolling down the street, I increased throttle to max, saw the DMM throttle voltage max out but no motor response. While holding the throttle at max, I worked both brake levers with no change, still no motor response. Rolled to a stop, worked the throttle up and down, throttle voltage was changing relative to throttle position, still no motor response. Finally backed throttle all the way to its stop, then forward and rode home.

This is not the OE throttle but behavior is the same. I want to put the OE throttle back (currently lashed to the moped rails where the 3 speed level switch is needed to run the moped).

TommyCat what do you think I should try next? Buy a new controller?

 

[TommyCat]

TommyCat what do you think I should try next? Buy a new controller?

The goal is to get it stuck in a faulted position. I.E. When the fault occurs FREEZE your throttle hand in the position it's in and keep the motor stuck off. Resist the temptation to respond to automatically resetting it, do not allow the throttle to return to the home position! Do NOT use the brake at this time if possible...

Hold it there, walk the bike to a safe spot and lift the drive wheel off the ground with the stand.
After achieving as good and safe a testing position as possible, always keeping the throttle twisted. Now you can lift the seat and check for the tattle-tail flashing controller error code hopefully set.

This has always been my first path to pursue...
You have proven that the brake will not reset the issue.
If you can't keep the throttle in stuck position by hand... tape it there. Or use any method that would not fail to keep it in the same position. Park the bike front tire up against a tree or building if you think that would be safer. Pop the seat and check that light!

As always, your safety comes first, only do it if you are comfortable with the procedure and you are sure the motor won't start. This is just the course that I would take.

 

[Zambam]

I put the OE throttle back. I suspect the controller's throttle circuitry became flaky when I hooked up 24S LFP battery (81V) to it where the instrument panel powered up but the throttle would not spin the wheel (on center stand).

I have a controller from when the moped was a few weeks old when the speedo and odometer display stopped working and was replaced with a new one. I just installed that controller which only saw 64V (SLA battery). I'll be riding around with no speedo or odo. Will see if the throttle issue goes away or not.