COMBUSTION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

The invention provides a combustion control device applied to an internal combustion engine having a glow plug 23, the glow plug 23 heating a gas in a cylinder, the combustion control device comprising: a compression end temperature estimating means for estimating a compression end temperature Tt which is a temperature of the gas in a cylinder when a position of a piston moving in the cylinder in a reciprocating manner is at the compression top dead center; and a compression end temperature changing means for causing the internal combustion engine to perform a compression end temperature increasing operation in the case where the compression end temperature Tt estimated by the compression end temperature estimating means is lower than a predetermined compression end reference temperature Ttref during the operation of the glow plug, the compression end temperature increasing operation changing the compression end temperature Tt to be equal to or higher than the predetermined compression end reference temperature Ttref.