Control system for internal combustion engine

摘要

In an intra-cylinder injection type engine, a first fuel cut-off starting rotational speed, a first return rotational speed and a first target idling speed in a compression stroke injection mode, which is superior in both combustion and responsivity, are set at lower speeds than a second fuel cut-off starting rotational speed, a second return rotational speed, and a second target idling speed in a suction stroke injection mode. During operation in the compression stroke injection mode, a fuel cut-off mode and an idle running of the engine are practised at low engine speed, to improve fuel economy without causing deterioration of combustion.