Patent ID: 6055963
Filing Date: 2000-05-02
Classification: F02D,F02M,Y02T

Abstract:
A method for dynamically adjusting a fuel control system of an internal combustion engine (12) during engine operation to account for variations in the energy content of a fuel delivered to the engine, the fuel control system utilizing a stored fuel energy content value (E.sub.G) to determine the necessary duration of a fuel admission valve control signal, the method comprising the steps of:(a) sensing engine speed;(b) determining engine load;(c) determining an expected exhaust O.sub.2 level as a function of said engine speed and said engine load;(d) sensing an actual engine exhaust gas O.sub.2 level;(e) comparing the exhaust gas O.sub.2 level sensed in step (d) with the expected exhaust gas O.sub.2 level; and(f) adjusting the stored fuel energy content value (E.sub.G) based upon the comparison made in step (e).