Abstract: A controller executes an advancement process for advancing an injection start timing by a direct injection valve to a larger extent when a coolant temperature that is a temperature of coolant in an internal combustion engine is greater than or equal to a preset temperature than when the coolant temperature is lower than the preset temperature. The advancement process includes a retardation process for setting a smaller advancement amount at the injection start timing when a lubricant temperature that is a temperature of lubricant is lower than a predetermined temperature than when the lubricant temperature is greater than or equal to the predetermined temperature.

Abstract: A controller executes an advancement process for advancing an injection start timing by a direct injection valve to a larger extent when a coolant temperature that is a temperature of coolant in an internal combustion engine is greater than or equal to a preset temperature than when the coolant temperature is lower than the preset temperature. The advancement process includes a retardation process for setting a smaller advancement amount at the injection start timing when a lubricant temperature that is a temperature of lubricant is lower than a predetermined temperature than when the lubricant temperature is greater than or equal to the predetermined temperature.

Abstract: A variable valve timing mechanism control apparatus which enables a valve timing of an intake valve of an internal combustion engine and a valve timing of an exhaust valve of the internal combustion engine to be varied individually, prohibits a change in the valve timing of the intake valve and changes only the valve timing of the exhaust valve when a valve overlap amount is negative. As a result, the required ignition timing will not change in a complex manner in the region where the valve overlap amount is negative so the ignition timing can be easily optimized even when the valve overlap amount is negative.