| 摘要 |
A control device and a control method for an internal combustion engine that reduce a target compression ratio for a variable compression ratio mechanism (2) to a minimum compression ratio and purge in that state, if an evaporated fuel component has accumulated to a certain level inside a canister (42) for an evaporated fuel processing device (40). Thermal efficiency is reduced by lowering the compression ratio, and the intake air volume and fuel volume required to obtain a desired torque are increased. As a result, the impact on an air-fuel ratio feedback correction coefficient relatively reduces, therefore the purgeable volume is increased. For example, the opening of the purge control valve is set to the maximum when the air-fuel ratio feedback correction coefficient is greater than the minimum and the fuel injection pulse width is greater than the minimum. The present invention facilitates a maximum purge volume without causing, e.g., destabilization of air-fuel ratio control. |
