Interpolation

[z0tya]

Has anybody info about vems VE, Spark, Lambdatarget map interpolation?
What cells are involved, what weight, and what is happen at the map edges?

THx

[dnb]

Not sure what happens at map edges - I try not to go there!  (I suspect it simply "rails" to the last cell)

The interpolation is based on linear bivariate.  So it takes the 4 corner points for the "cell" you're in and weights them based on the distance from each corner.  You'll probably find a standard algorithm & explanation on wikipedia.

[z0tya]

Thx!

So no more than 4 points..

[gunni]

Personally I wouldn´t want more then 4 points.
Especially if the engine has quick changes in VE

[mattias]

Only 4 points yes. It will rail to the edges of the map if exceeding the bounds with one exception for ignition :
The cranking advance will interpolate from the cranking threshold rpm up to the first rpm bin in the ignition table. I found out the hard way that this was the normal and actually pretty ok behaviour.