초록 ▼

The present invention aims at preventing deterioration of driveability due to lean combustion, in a direct injection spark ignition type internal combustion engine. To this end, there is calculated a target engine-torque tTe which is to be generated by the engine, based on an engine driving conditio

The present invention aims at preventing deterioration of driveability due to lean combustion, in a direct injection spark ignition type internal combustion engine. To this end, there is calculated a target engine-torque tTe which is to be generated by the engine, based on an engine driving condition, while detecting an actual engine-torque Te which is being actually generated by the engine. There is further calculated a deviation state quantity .DELTA.TQ=Te-tTe, which represents a deviation state between the target engine-torque and the actual engine-torque. Then, the lean combustion is inhibited when the deviation state quantity .DELTA.TQ is equal to or larger than a predetermined value. Namely, homogeneous lean combustion and stratified lean combustion are inhibited, and the combustion mode is switched to homogeneous stoichiometric combustion.

대표청구항 ▼

[ What we claimed are:] [1.] A control apparatus for a direct injection spark ignition type internal combustion engine, including a fuel injection valve for directly injecting fuel into a combustion chamber of the engine, and combustion mode switching control means for controlling switching of a com

[ What we claimed are:] [1.] A control apparatus for a direct injection spark ignition type internal combustion engine, including a fuel injection valve for directly injecting fuel into a combustion chamber of the engine, and combustion mode switching control means for controlling switching of a combustion mode of the engine at least between a stoichiometric air-fuel ratio and lean combustion at lean air-fuel ratio, corresponding to an engine driving condition, said apparatus comprising:target-engine-torque calculating means for calculating a target engine-torque which is to be generated by the engine, based on the engine driving condition;actual engine-torque detecting means for detecting an actual engine-torque which is being actually generated by the engine;deviation state quantity calculating means for calculating a deviation state quantity which represents a deviation state between said target engine-torque and said actual engine-torque; andlean combustion inhibition means for inhibiting said lean combustion when said deviation state quantity is equal to or larger than a predetermined value.