Control apparatus for an in-cylinder injection spark-ignition internal combustion engine

A control apparatus for an in-cylinder injection spark-ignition internal combustion engine, which has a fuel injection valve for injecting fuel directly into a combustion chamber, and in which the fuel is injected mainly in a compression stroke, thereby undergoing stratified-charge combustion, when the internal combustion engine is operated in a specified operation region, comprising:

• target load setting means for setting a target load value corresponding to accelerator opening information based at least on a driver's operation;
• rotational speed detecting means for detecting a rotational speed of said internal combustion engine;
• control parameter value setting means for setting an engine control parameter value in accordance with the set target load value and the detected engine rotational speed;
• environmental parameter value detecting means for detecting environmental parameter values correlated with an intake air density;
• control parameter correcting means for correcting at least one engine control parameter value including at least one of a set fuel injection timing and ignition timing based on the detected environmental parameter values;
• and
• control means for executing said stratified-charge combustion in accordance with the corrected set at least one engine control parameter value.

A method for controlling an in-cylinder injection spark-ignition internal combustion engine having a fuel injection valve for injecting fuel directly into a combustion chamber, the fuel being injected mainly in a compression stroke for a stratified-charge combustion when the internal combustion engine is operating in a specified region, comprising:

• setting a target load value corresponding to accelerator opening information based at least on a driver's operation;
• detecting at least one environmental parameter value correlated with an intake air density;
• discriminating that the internal combustion engine is being operated in a compression-stroke injection mode based on said set target load value;
• correcting the set target load value based on the detected at least one environmental parameter value when said discriminating step discriminates that the internal combustion engine is being operated in a compression-stroke injection mode;
• setting at least one engine control parameter value including at least one of a fuel injection timing and an ignition timing in accordance with the corrected target load value;
• and
• executing the stratified-charge combustion in accordance with the set at least one engine control parameter value.

A method for controlling an in-cylinder injection spark-ignition internal combustion engine having a fuel injection valve for injecting fuel directly into a combustion chamber, the fuel being injected mainly in a compression stroke for a stratified-charge combustion when the internal combustion engine is operating in a specified region, comprising:

• setting a target load value corresponding to accelerator opening information based at least on a driver's operation;
• detecting a rotational speed of the internal combustion engine;
• setting an engine control parameter value in accordance with the set target load value and the detected engine rotation speed;
• detecting at least one environmental parameter value correlated with an intake air density;
• correcting at least one engine control parameter value including at least one of a fuel injection timing and an ignition timing based on the detected at least one environmental parameter value;
• and
• executing the stratified-charge combustion in accordance with the corrected set at least one engine control parameter value.