Engwe C20 Pro Speed sensor + Throttle

[angeloz]

Hi, I have an Engwe C20 Pro. I changed the controller and display. I chose those from Engwe Engine X. and in addition, I also purchased an engine hall cable. I assembled everything. Now, the problem is that with the white cable inserted, the accelerator does not work well and the speedometer fluctuates. When I accelerate, the accelerator does not give full throttle. After accelerating briefly, it stops. I was wondering why this malfunction. Maybe I have to insert the white cable elsewhere. The original controller of the C20 Pro was different and already had the hall cable as in the photo. If I disconnect the white cable, everything works perfectly but the odometer doesn't work.





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[saneagle]

Logically, there's a problem with your speed sensor drawing too much current. Why did you replace the controller?

 

[angeloz]

I replaced the controller, because the display (Yolin yl80c) was limited in settings. Now, I have all the settings but I have this problem. If I put the old display and the old controller back, everything works

 

[saneagle]

I replaced the controller, because the display (Yolin yl80c) was limited in settings. Now, I have all the settings but I have this problem. If I put the old display and the old controller back, everything works

The only thing I can think off is to try an external speed sensor. if you have an old cycle computer, you can cut the sensor off and join one wire to the white wire and the other to ground.

I'm wondering if your present speed sensor is the wrong way round for the controller. Some controllers keep 5v on the signal wire and when the magnet passes the hall, it shorts it to ground to make a pulse. Others have the signal wire resting at 0v and the hall shorts it to 5v for the pulse. I can't think about it hard enough to figure out whether that's a problem or not, but you can see if there's a difference in the two controllers by measuring the voltage on that white wire when switched on but not connected to the motor - on the controller side.

 

[angeloz]

I'll buy a multimeter. Is there any other solution I could try? Thank you very much

 

[saneagle]

I'll buy a multimeter. Is there any other solution I could try? Thank you very much

Not really. If you want to sort out ebikes, you need a meter.

 

[angeloz]

Video where you can see the problem

C20 Pro Throttle.mp4

drive.google.com

 

[saneagle]

Video where you can see the problem

C20 Pro Throttle.mp4

drive.google.com

It's hitting the speed limit, which is cutting the motor. As soon as the wheel-speed slows down below the limit, the power comes back and kicks it over again.

It's possible that you have the wrong setting for the number of magnets in the speed sensor. Is the speed showing correctly, or is it six times the actual speed when the motor is turning slowly? It looks like it's way over to me. Have a look in the LCD to see if it's set to 6. If it is, change it to 1.

 

[angeloz]

The speed is quite precise when the engine is running slowly.
The number of magnets is set to 1

Yolin YL80C Settings: https://drive.google.com/file/d/1xG0ZWudARO5P_l3ei6vEvSKteSwduviV/view?

 

[saneagle]

The speed is quite precise when the engine is running slowly.
The number of magnets is set to 1

Yolin YL80C Settings: https://drive.google.com/file/d/1xG0ZWudARO5P_l3ei6vEvSKteSwduviV/view?

Sorry, I got it the wrong way round. You need to set it to 6.

 

[angeloz]

It works! Thank you very much!