Controller for an internal combustion engine

摘要

The invention stabilizes combustion performance upon a change from operation with stratified combustion to operation with homogeneous combustion. The lower limit for the equivalence ratio just after a change from operation with stratified combustion to operation with homogeneous combustion is set at a value greater than set under steady conditions so as to avoid adverse influence of residual external and internal EGR (exhaust gas recirculation).