Adaptive air/fuel control applied to a single point injection system for SI engines

The paper describes a method of improving the air/fuel (A/F) accuracy of a single point fuel injection system that is controlled by a microprocessor. The method develops correction factors as a function of engine speed and manifold absolute pressure. The correction factors are stored in keep alive memory (KAM) for future use. The correction factors reduce A/F deviations during both open and closed loop operation thereby improving three way catalyst (TWC) efficiency and eliminating the need for a secondary air system.