The fuel delivery strategy uses a two dimensional table that has four rows and four columns, for a total of 16 "cells". In our ECM the Long Term fuel adjustment (BLM) happens about twice per second, while the Short Term fuel adjustment (INT) happens about 20 times per second Basically, these two strategies are used to make adjustments and adaptations to the ever changing loads, atmospheric conditions, and fuel quality to keep the car's air/fuel ratio correct for driveability and emissions.Īlso, keep in mind that when we say Long Term or Short Term, we are talking in computer time, not human time. The Integrator is the same idea, only for short term adjustments. In a nutshell, the Block Learn Multiplier (BLM) is the long term fuel adjustment that the ECM "learns" to keep the air/fuel ratio within acceptable parameters.
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