Patent ID: 6631704
Filing Date: 2003-10-14
Classification: F02B,F02D,F02F,F02M,Y02T

Abstract:
A control system for an internal combustion engine of an in-cylinder fuel injection type, the engine being operated while switching a combustion mode thereof between a homogeneous combustion mode in which fuel injection into each cylinder is performed during an intake stroke, a stratified combustion mode in which the fuel injection into the cylinder is performed during a compression stroke, and a two-stage fuel injection combustion mode in which the fuel injection into the cylinder is performed once during the intake stroke and once during the compression stroke during transition between the homogeneous combustion mode and the stratified combustion mode,the control system comprising: a demanded torque-calculating module for calculating a demanded torque which is demanded of the engine; an engine rotational speed-detecting module for detecting a rotational speed of the engine; a combustion mode-determining module for determining, based on the calculated demanded torque, which of the homogeneous combustion mode, the stratified combustion mode, and the two-stage fuel injection combustion mode should be selected as the combustion mode; and a fuel injection amount-determining module for determining an amount of fuel to be injected during the compression stroke in the two-stage fuel injection combustion mode, based on the detected rotational speed of the engine.