Fuel injection control system for internal combustion engines

Claim 1

In a fuel injection control system for an internal combustion engine having an intake passage and at least one combustion chamber, said intake passage having an inner wall surface, said fuel injection control system including: fuel supply amount-calculating means for calculating an amount of fuel to be supplied to said engine, based on operating conditions of said engine including at least load on said engine; adhering fuel amount-calculating means for calculating an amount of fuel adhering to said inner wall surface of said intake passage of said engine, by the use of adhering fuel parameters representative of transfer characteristics of fuel injected into said intake passage; carried-off fuel amount-calculating means for calculating an amount of fuel to be carried off from said fuel adhering to said inner wall surface of said intake passage into said at least one combustion chamber, by the use of said adhering fuel parameters; fuel injection amount-correcting means for correcting said amount of fuel to be supplied to said engine according to said amount of fuel adhering to said inner wall surface of said intake passage and said amount of fuel to be carried-off from said fuel adhering to said inner wall surface to calculate a corrected fuel injection amount; and fuel injection control means for injecting fuel in said corrected fuel injection amount into said intake passage; the improvement comprising starting condition-detecting means for detecting a starting condition of said engine, and wherein when said starting condition-detecting means detects that said engine is in said starting condition, and at the same time said corrected fuel injection amount is below a predetermined value, said fuel injection control means injects fuel into said intake passage in an amount at least larger than said predetermined value.