INTERNAL COMBUSTION ENGINE CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an internal combustion engine canister purge control device capable of avoiding adverse effect on exhaust emission as much as possible and purging evaporated fuel adsorbed by a canister as much as possible.SOLUTION: Purging of evaporated fuel is executed and fluctuation in an air-fuel ratio in exhaust gas is grasped in a state in which learning of at least one region is completed; the purging of the evaporated fuel continues if the fluctuation in the air-fuel ratio falls within a predetermined range; and the purging of the evaporated fuel stops and learning control is exerted if the fluctuation in the air-fuel ration is greater than the fluctuation in the predetermined range. It is determined whether to continue purging or to stop purging to switch over to the learning control depending on the fluctuation in the air-fuel ratio after purging the evaporated fuel. It is, therefore, possible to purge the evaporated fuel adsorbed by a canister as much as possible and avoid the adverse effect on exhaust emission as much as possible.