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You are right about the VSS's utilty. I would not discount the VSS's usefulness at all. In the first version of the VID, I spent processor time measuring VSS pulse width etc--but only to within the nearest 250 microsecond. The new version, just counts pulses over a fixed period of time. Given the time interval i use, this naturally can result in slower response to non-average velocity conditions. But till now--this was good enough. The addition of a two or three axis accelerometers. would serve to augment the VSS--- not replace it.. And, it would be cpu time intensive-- to make multiple measurements and integrate fps/s to fps would take CPU resources. Because when you think about it, the VSS is doing most of the work.(most of the time--anyway)... it is more than adequate for simple fuel meter applications. My VSS gives about 4000 PPM. At 60 MPH that is about 66 counts per second (1.1 % error)--or about 15 millisecond period. My basic clock is current set to (a slow) 125 microseconds--so 15 ms resolves to an even 120 counts. So--yes i agree.. VSS is GOOD.
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