Fuel supply control method for internal combustion engines immediately

Abstract

A fuel supply control method of controlling the quantity of fuel being supplied to an internal combustion engine after cranking thereof. Upon generation of a predetermined control signal immediately after the cranking of the engine, an initial value of a fuel increment is set, which corresponds to the engine temperature. Subsequently, the set initial value is decreased at a predetermined rate upon each generation of the predetermined control signal. A quantity of fuel is set by the use of the thus decreased value of the fuel increment and supplied to the engine in synchronism with generation of the predetermined control signal. When the fuel increment has a value larger than a predetermined reference value, the value of the fuel increment is decreased at a first rate, while when it has a value smaller than the predetermined reference value, it is decreased at a second rate smaller than the first rate. Preferably, the predetermined reference value assumes a value dependent upon the initial value of the fuel increment, e.g. a product obtained by multiplying the initial value of the fuel increment by a predetermined coefficient. Further preferably, when the fuel increment value is smaller than a fixed value, it is decreased at the second rate, even if it is larger than the predetermined reference value.