Nubo
Well-known member
turbo2ltr said:Nubo said:Of course it is real, what I'm asking is why have it? It is emulation in that letting up on the throttle of an ICE car gives engine braking as a mechanical consequence unless the driver shifts to neutral. But for an EV, it's merely a design decision not a consequence. So why do it?
To recapture energy!
It does do this to some extent. But you also have to take into account that on a full pack , there is no regen available. So if you did what you are proposing, the change in pedal feel from when the pack is full to when it isn't would be quite drastic. As it is now, on a full pack, that first stop can be a bit unnerving..Why can't the regen be blended into the brakes in such a way that friction brakes do not apply until regen is already maximized?
Why is that an unvavoidable consequence? If the controller were smart enough to blend regen and friction, why should it matter if regen is available? Again, my premise was simple -- engage regen until maximized then apply friction as needed. If I command a certain deceleration rate, and there is no regen available, the friction would be engaged as appropriate. Or, the converse -- if regen is available retard the hydraulics. Thus the hydraulics would always be ready for controller failure, etc..
Seems like a fairly straightforward relationship between pedal position, speed of pedal application, vehicle acceleration, regen, and hydraulics. From what you describe, the blending is not being done at this sophisticated a level. But I don't understand why it could not be. The elements seem to be in place, just not being employed that way.