Patent ID: RE39137

Claim:
A control unit for an in-cylinder injection internal combustion engine in which fuel is directly injected into a combustion chamber and is adapted to select, according to an operation state of said internal combustion engine, a compression stroke injection mode for mainly injecting fuel at a compression stroke and an intake stroke injection mode for mainly injecting fuel at an intake stroke, said control unit comprising: load correlation value detecting means for detecting a load correlation value of said internal combustion engine; rotational speed detecting means for detecting an engine rotational speed of said internal combustion engine; target load level setting means for setting a target load level according to the load correlation value detected by said load correlation value detecting means and the engine rotational speed detected by said rotational speed detecting means; target air/fuel ratio setting means for setting a target air/fuel ratio at a first air/fuel ratio which is on a fuel-leaner side of a stoichiometric air/fuel ratio when said compression stroke injection mode is selected, and at a second air/fuel ratio which is on a fuel-richer side of said first air/fuel ratio when said intake stroke injection mode is selected; intake amount correcting means for changing an amount of intake supplied to said internal combustion engine; intake correction amount setting means for setting, according to the target load level set by said target load level setting means, a first intake correction amount required in said compression stroke injection mode or a second intake correction amount required in said intake stroke injection mode; and intake amount correction control means for controlling operation of said intake amount correcting means according to said first or second intake correction amount set by said intake correction amount setting means.