Abstract: In a direct injected, spark ignition internal combustion engine of a type having a stratified charge combustion mode and a homogeneous charge combustion mode, a controller selects one of the combustion modes in accordance with a sensed engine operating condition and calculates only the fuel injection quantity of the selected mode to lessen the load of calculation. The controller calculates a stratified mode fuel injection timing on the compression stroke only during the period of the stratified mode whereas the controller calculates a homogeneous mode injection timing on the intake stroke during the periods of both the homogeneous mode and the stratified mode to achieve a quick and smooth changeover from the stratified mode to the homogeneous mode. During the period of the stratified mode, the homogeneous mode injection timing is calculated in accordance with the fuel injection quantity according to the stratified mode.