Control system for internal combustion engines

In a control system for an internal combustion engine having at least one combustion chamber, an intake passage having an inner surface, a fuel tank, a canister for adsorbing evaporative fuel generated from said fuel tank, and a purging passage connecting between said canister and said intake passage, said control system including supply fuel amount calculating means for calculating an amount of supply fuel to be supplied to said engine, 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, carried-off fuel amount estimating means for estimating an amount of carried-off fuel amount evaporated from fuel adhering to said inner surface of said intake passage and carried into said combustion chamber, supply fuel amount correction means for correcting said supply fuel amount calculated by said supply fuel amount calculating means, in response to 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 supply fuel amount correcting means into said intake passage,
• the improvement comprising:
• (1) evaporative fuel amount detecting means for detecting an amount of evaporative fuel supplied to said intake passage via said purging passage;
• and
• (2) 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 evaporative fuel amount detected by said evaporative fuel amount detecting means.

In a control system for an internal combustion engine having at least one combustion chamber, an intake passage having an inner surface, at least one intake valve, at least one exhaust valve, and valve operating means for changing a valve operating characteristic of at least one of said intake valve and said exhaust valve, said control system including supply fuel amount calculating means for calculating an amount of fuel to be supplied to said engine, 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, 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 and carried into said combustion chamber, 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 supply said supply fuel amount corrected by said fuel amount correcting means into said intake passage,

• the improvement comprising:
• 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.

In a control system for an internal combustion engine having at least one combustion chamber, and an intake passage, including supply fuel amount calculating means for calculating an amount of supply fuel amount calculating means for calculating an amount of fuel to be supplied to said engine, 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, 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 and carried into said combustion chamber, 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, fuel injection means for injecting said supply fuel amount corrected by said supply fuel amount correcting means into said intake passage, said fuel injection means having an injection port, and auxiliary air supply means for supplying auxiliary air to said fuel injection means at a zone in the vicinity of said injection port,

• the improvement comprising:
• 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 an amount of said auxiliary air supplied by said auxiliary air supply means.