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YIYUN TECH YK85 question ...


10 W
Dec 7, 2010

Got one of these oldies in a chinese micro-scooter.
Since I've upgraded the hub motor from geared 250W to gearless 500W, one of the goals is to enable regenerative braking.
Here's a photo of the controller board:

(click for larger image)

I've tried to solder a small bridge between ABS contact and the small rectangular GND to the right of it.
However, this did not change brake function, connected to the HL contact. When HL is shorted to ground, controller just interrupts power to the motor, but there's no regenerative braking.

Anybody knows how to enable it? I know there are similar controllers like YK87, YK31... perhaps they are similar.