ENGINE COMBUSTION CONTROL DEVICE

A combustion control device for an internal combustion engine, which establishes an optimum combustion condition by detecting the combustion pressure in the cylinder and controlling the exhaust gas reflux rate, the ignition timing and the fuel injection timing or the injection rate at the intake stroke in order to improve the fuel economy and the quality of the exhaust gas in the engine. Provided with an in-cylinder pressure detection means for detecting the in-cylinder pressure in connection with the combustion in the engine, and a means for estimating the heat generation rate with respect to the angle of the crank shaft of the cylinder according to the output from the in-cylinder pressure detection means, the ignition timing and the fuel injection timing control the control variables such as EGR control parameters related to the combustion so that the in-cylinder combustion state pattern obtained by the heat generation rate estimation means may be reshaped into a predefined waveform pattern.