Control system for internal combustion engines

Claim 1

A control system for an internal combustion engine (1) having at least one combustion chamber, an intake passage (2) having an inner surface, at least one intake valve, and at least one exhaust valve, said control system including supply fuel amount calculating means for calculating an amount of fuel to be supplied to said engine (1), based upon operating conditions of said engine, adherent fuel amount estimating means for estimating an amount of adherent fuel adhering to said inner surface of said intake passage (2), carried-off fuel amount estimating means for estimating an amount of carried-off fuel evaporated from fuel adhering to said inner surface of said intake passage (2) and carried into said combustion chamber (1), supply fuel amount correcting means for correcting said supply fuel amount calculated by said supply fuel amount calculating means, based upon said adherent fuel amount estimated by said adherent fuel amount estimating means and said carried-off fuel amount estimated by said carried-off fuel amount estimating means, and fuel supply means for supplying said supply fuel amount corrected by said fuel amount correcting means into said intake passage (2), characterised in that the control system further comprises: valve operating means for changing a valve operating characteristic of at least one of said intake valve and said exhaust valve, and estimated fuel amount correcting means for correcting said adherent fuel amount estimated by said adherent fuel amount estimating means and said carried-off fuel amount estimated by said carried-off fuel amount estimating means, in response to said valve operating characteristic of said at least one said intake valve and said exhaust valve.