LTFT is an average of STFT values, right? But how many of the STFT values does it take into account? Is the LTFT calculated by using the last driving cycle's STFTs only? Is it an average of more than one driving cycles or is it an average of all STFT values since the last (for whatever reason) reset?
I'm asking, because I was monitoring the LTFT of my car while driving in the city and it fluctuated widely between 4 or 5% to 12% repeatedly every few minutes minutes.
I'm asking, because I was monitoring the LTFT of my car while driving in the city and it fluctuated widely between 4 or 5% to 12% repeatedly every few minutes minutes.