CONTROL DEVICE AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

A control device for an internal combustion engine according to the invention includes: abnormality determination means (103) for determining the presence of an abnormality in a fuel system, such as an injector (45), by comparing a air-fuel ratio detected by an A/F sensor (71) and a learning value of the air-fuel ratio with a preset abnormality determination value; alcohol concentration estimating means (104) for estimating the alcohol concentration in fuel based on the air-fuel ratio detected by the A/F sensor (71) and the learning value; and abnormality determination value changing means (105) for changing the abnormality determination value depending on the alcohol concentration estimated by the alcohol concentration estimating means (104).