Control apparatus for cylinder fuel injection internal combustion engines

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, an intake correction amount;
• intake correction amount adjusting means for adjusting said intake correction amount according to a correction coefficient corresponding to a selected injection mode;
• and
• intake amount correction control means for controlling operation of said intake amount correcting means according to the intake correction amount adjusted by said intake correction amount adjusting means corresponding to each injection mode.

A control unit for an in-cylinder injection internal combustion engine in which fuel is directly injected into a combustion chamber and which selectively takes, according to an operation state of said internal combustion engine, a compression-stroke injection mode to mainly inject fuel during a compression stroke and an intake-stroke injection mode to mainly inject fuel during an intake stroke, said control unit comprising:

• load correlation value detecting means for detecting a load correlation value of the internal combustion engine;
• rotational speed detecting means for detecting an engine rotational speed of the 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 selectively setting, based on a predetermined relationship between various operation states of the internal combustion engine and their corresponding target air/fuel ratio values, the target air/fuel ratio to a first air/fuel ratio value, which fuel is leaner than a stoichiometric air/fuel ratio, when said compression-stroke injection mode is selected, and to a second air/fuel ratio value, which fuel is richer than said first air/fuel ratio value, when said intake-stroke injection mode is selected, according to at least one of said operation state and/or operation environmental state detected by an operation state detecting means;
• intake amount adjusting means for changing an amount of intake fuel supplied to the internal combustion engine;
• target intake amount setting means for setting, based on a predetermined relationship between various operational states of the internal combustion engine and their corresponding target intake amount values, the target intake amount to a first target intake amount value required in said compression stroke injection mode and a second target intake amount value required in said intake-stroke injection mode, according to the target load level set by said target load level setting means;
• intake correction amount setting means for setting a first intake correction amount (Q2) corresponding to said first target intake amount, which is required in said compression-stroke injection mode, and a second intake correction amount (Q1) corresponding to said second target intake amount, which is required in said intake-stroke injection mode;
• and
• intake amount control means for controlling operation of said intake amount adjusting means, selectively based on said first target intake amount, which is set by said target intake amount setting means, and said first correction amount, which is set by said intake correction amount setting means, while the internal combustion engine takes the compression-stroke injection mode, and based on said second target intake amount, which is set by said target intake amount setting means, and said second intake correction amount, which is set by said intake correction amount setting means, while the internal combustion engine takes the intake-stroke injection mode.

A control unit for an in-cylinder injection internal combustion engine in which fuel is directly injected into a combustion chamber and which selectively takes, according to an operation state of said internal combustion engine, a compression-stroke injection mode to mainly inject fuel during a compression stroke and an intake-stroke injection mode to mainly inject fuel during an intake stroke, said control unit comprising:

• load correlation value detecting means for detecting a load correlation value of the internal combustion engine;
• rotational speed detecting means for detecting an engine rotational speed of the 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 selectively setting, based on a predetermined relationship between various operation states of the internal combustion engine and their corresponding target air/fuel ratio values, the target air/fuel ratio to a first air/fuel ratio value, which fuel is leaner than a stoichiometric air/fuel ratio, when said compression-stroke injection mode is selected, and to a second air/fuel ratio value, which fuel is richer than said first air/fuel ratio value, when said intake-stroke injection mode is selected, according to at least one of said operation state and/or operation environmental state detected by an operation state detecting means;
• intake amount adjusting means for changing an amount of intake fuel supplied to the internal combustion engine;
• target intake amount setting means for setting, based on a predetermined relationship between various operational states of the internal combustion engine and their corresponding target intake amount values, the target intake amount, according to the target load level set by said target load level setting means;
• intake correction amount setting means for setting an intake correction amount corresponding to the target intake amount set by said target intake amount setting means;
• intake correction amount adjusting means for adjusting the intake correction amount set by said intake correction amount setting means, based on a correction coefficient corresponding to the injection mode being selected;
• and
• intake amount control means for controlling operation of said intake amount adjusting means based on the adjusted intake correction amount, which is adjusted by said intake correction amount adjusting means.

A control unit for an in-cylinder injection internal combustion engine in which fuel is directly injected into a combustion chamber and which selectively takes, according to an operation state of said internal combustion engine, a compression-stroke injection mode to mainly inject fuel during a compression stroke and an intake-stroke injection mode to mainly inject fuel during an intake stroke, said control unit comprising:

• operation state detecting means for detecting an operation state of the internal combustion engine and/or an operation environmental state of the internal combustion engine;
• intake amount adjusting means for changing an amount of intake fuel supplied to the internal combustion engine;
• intake correction amount setting means for setting an intake correction amount according to the operation state and/or the operation environmental state detected by said operation state detecting means, based on a predetermined relationship between said intake correction amount and the operation state and/or the operation environmental state, said relationship being adapted to be used while the engine is running idle, and being set independently for said compression-stroke injection mode and said intake-stroke injection mode;
• and
• intake amount control means for controlling operation of said intake amount adjusting means, based on the intake correction amount set by said intake correction amount setting means.

A control unit for an in-cylinder injection internal combustion engine in which fuel is directly injected into a combustion chamber and which selectively takes, according to an operation state of said internal combustion engine, a compression-stroke injection mode to mainly inject fuel during a compression stroke and an intake-stroke injection mode to mainly inject fuel during an intake stroke, said control unit comprising:

• operation state detecting means for detecting an operation state of the internal combustion engine and/or an operation environmental state of the internal combustion engine;
• intake amount adjusting means for changing an amount of intake fuel supplied to the internal combustion engine;
• intake correction amount setting means for setting, according to a predetermined relationship between an intake correction amount and the operation state and/or the operation environmental state of the internal combustion engine, said intake correction amount in such a manner that said intake correction amount differs between in said compression-stroke injection mode and in said intake-stroke injection mode, even with the same torque generated in said both modes;
• and
• intake amount control means for controlling operation of said intake amount adjusting means, based on the intake correction amount set by said intake correction amount setting means.