Malcolm wrote:I'm pretty sure most ECUs will (linearly?) interpolate values between cells in each table, so rather that moving through timing/fueling points in steps it follows a gradual curve through the values. The resolution then would be of most importance in areas of rapid change (like the scenario you mentioned when vtec engages between two cells).
Yeah I think some use linear interpolation and others might be a bit more clever using a best-curve-to-fit type calculation, I just thought it was beyond the scope hence the:
Me wrote:ECUs have various other functions at play to help them fill in the blanks
I guess a way of looking at it is - if you're bored get any dyno plot, and look at the torque curve and treat it as a thumbsuck to relative engine efficiency through the rev range. Decide what ECU resolution you use, and take a bunch of samples from that dyno plot - say every 500rpm for sake of arguement, then plot a new dyno plot by plotting those points and connecting them using straight lines and compare the results... as that is what many ECUs is essentially doing. They will be close, but not identical.
