Electronic fuel injection control system for an internal combustion engine

摘要

An electronic fuel injection (EFI) control system (10) for an internal combustion engine. The EFI control system (10) is disclosed in conjunction with a compression ignition engine (12) where the parameters of fuel quantity (446) and injection timing (460) are controlled on the basis of a plurality of engine operating conditions. The parameter of fuel quantity (446) is obtained from a comparison of computed values of percent load fuel quantity (428) and full load fuel quantity (444) with the lesser of the two being selected. The percent load fuel quantity (428) has a proportional component (416) that is a function of actual engine speed (414) and commanded engine speed (412), and an integral component (426) that is related to cumulative speed error (422). The full load fuel quantity (444) is a function of actual engine speed (414) and manifold air density (436). The parameter of injection timing (460) is obtained from a summation of two computed quantities for injection advance. One quantity ( 452) is a function of actual engine speed (414) and the selected fuel quantity (446). The other quantity (456) is a function of air temperature (442). The system (10) includes the capability to trim fuel quantity (446) to compensate for variations in individual injector (42) and cylinder (16) characteristics.