Adaptive process for controlling fuel injection in an engine

Claim 1

An adaptive process for continuously determining the injection time of an engine as a function of intake pressure or air flow at the intake comprising the steps of: establishing a straight control line function defined by a slope and a beginning ordinate; analyzing periodically the exhaust gas of said engine to determine richness differences in said exhaust gases; dividing the range of possible intake pressures into a number of zones, each of which has assigned a central pressure value at a point in each zone; measuring the intake pressure and determining the zone into which it falls; determining in relation to said straight line function a first correction factor as a function of said analyzing and the desired richness; computing in relation to said straight line function a second correction factor for each zone by a purely linear computation as a function of said first correction factor, said slope and said beginning ordinate; computing new values of the slope and beginning ordinate by a purely linear formula as a function of constants in read only memory and the values of said second correction factor; weighting the coefficients used for computing the slope and beginning ordinate during each analysis cycle so that the straight line function approaches the various said points in each zone.