In a dual-fuel injection operation involving direct injection and port injection in an engine (1), when a fuel injection time (TAUD) by a direct injector (7) as determined on the basis of a direct fuel pressure is less than a minimum value (TAUDmin), the d...

A control apparatus for an internal combustion engine according to an embodiment of the present invention (present apparatus) determines, based on an output value of the downstream air-fuel ratio sensor 67, which a target air-fuel ratio being a target valu...

A purge flow rate to be added (a value to be added or subtracted) DQPGC is calculated based on a deviation between a target purge flow rate QPGCMD (the current value) and the purge flow rate QPGC(k-1) that was calculated in the previous control cycle (step...

Gas containing fuel vapor is purged as purge gas from a canister to an intake passage of an engine through a purge line. An ECU renews a vapor concentration value representing the concentration of fuel vapor contained in the purge gas by a predetermined re...

The engine (1) has a unit to recognize a hot start. When hot start conditions are present, Lambda regulation effects the opening behavior of a tank ventilation valve (12) in such a way, that an optimum fuel-air-ratio Lambda for a hot start resp. hot after-...