DEVICE FOR DETECTING INTER-CYLINDER AIR-FUEL RATIO VARIATION ERROR IN MULTICYLINDER INTERNAL COMBUSTION ENGINE

摘要

This device for detecting an inter-cylinder air-fuel ratio variation error in a multicylinder internal combustion engine increases the amount of fuel injected in a predetermined target cylinder, and detects an inter-cylinder air-fuel ratio variation error on the basis of at least the change in rotation of the target cylinder after the increase. The amount of fuel injected is increased during post-fuel-cut rich control. Deterioration in exhaust emissions caused by error detection can thus be minimized because the amount of fuel injected is increased by utilizing the timing at which post-fuel-cut rich control is executed.