Patent ID: 6602165
Filing Date: 2003-08-05
Classification: B60W,F02B,F02D,F16H,Y02T,Y10T

Abstract:
A system for controlling an internal combustion engine in which gasoline fuel is directly injected into cylinder combustion chambers and is ignited by a spark plug, and an automatic transmission connected to the engine to modify engine power in accordance with a selected one of shift programs, comprising:engine operating condition detecting means for detecting operating conditions of the engine including at least an engine speed and an engine load; required torque determining means for determining a torque required by the engine based on the detected engine speed and the engine load in accordance with ones, of characteristics predetermined separately for the shift programs, that are corresponding to the selected shift program; operation mode determining means for determining an operation mode of the engine to one of at least three operation modes comprising a stoichiometric air/fuel ratio operation mode in which a desired air/fuel ratio to be supplied to the engine is set to a stoichiometric air/fuel ratio and lean-burn operation modes including at least a pre-mixture combustion operation mode in which the desired air/fuel ratio is set to be leaner than the stoichiometric air/fuel ratio and a stratified combustion operation mode in which the desired air/fuel ratio is set to be leaner than that of the pre-mixture combustion operation mode, based on at least the determined required torque; output fuel injection amount determining means for determining an output fuel injection amount to be supplied to the engine by correcting a basic fuel injection amount, determined based on the detected engine operating conditions, by the set desired air/fuel ratio of the determined operation mode; and fuel injector which directly injects fuel into the combustion chamber of the engine determined based on the output fuel injection amount.