Abstract: A method and a system for electronically controlling the quantity of fuel being supplied to an internal combustion engine equipped with an exhaust gas recirculation control system. A plurality of sets of basic values of fuel quantity are stored beforehand, which are set as a function of at least two parameters indicative of operating conditions of the engine, for selection in response to the rate of recirculation of exhaust gases being effected by the exhaust gas recirculation control system. Read from a selected set of basic values of fuel quantity is a basic value of fuel quantity which corresponds to actual values of the above at least two parameters detected, and a quantity of fuel is supplied to the engine, which corresponds to the read basic value of fuel quantity.

Abstract: An air/fuel ratio feedback control system adapted to control the air/fuel ratio of an air/fuel mixture being supplied to an internal combustion engine, by the use of a first coefficient having a value variable in response to actual exhaust gas concentration and at least one second coefficient having a value variable in dependence on the kind of a particular operating condition or region in which the engine is operating.