ASUN wrote:Were you slowing down, hit a BIG bump on the road, and the car jumps forward?
This does happen, and it is quite scary indeed.
I posted about this previously, and the responses state it's regarding the car letting go of the drivetrain to release the tension from the bump on the road.
This is regenerative braking backing off when the DSC/Traction control is triggered (i.e. Bumpy or slippery surface). This is normal and it is to prevent the regenerative braking locking the rear wheels and causing loss of control (basically a handbrake turn). It can also be predicted by looking at the road surface and considering how much regeneration you're demanding.
It gives the impression of a 'surge', but it's really just the braking effect from regeneration being removed. The brain interprets this as 'accelerating' in a way.