Patent ID: 6240894
Filing Date: 2001-06-05
Classification: F02B,F02D,Y02T

Abstract:
A control system for an internal combustion engine of a cylinder injection type, comprising:fuel injection valves for injecting fuel directly into cylinders, respectively, of said internal combustion engine;ignition means for igniting fuel within said cylinders, respectively, intake air flow regulating means for regulating quantity of intake air fed to said internal combustion engine;sensors of various types for detecting operation states of said internal combustion engine; andcontrol means for controlling said fuel injection valves, said ignition means and said intake air flow regulating means in dependence on said engine operation states,wherein said various types of sensors are designed to detect at least an engine rotation number, an accelerator pedal depression stroke and the intake air quantity,wherein said control means comprising:combustion mode determining means for determining selectively at least five combustion modes in dependence on said engine rotation number and said accelerator pedal depression stroke;desired air-fuel ratio setting means for setting a desired air-fuel ratio in conformance with said combustion mode on the basis of said engine rotation number and said accelerator pedal depression stroke;desired fuel injection quantity arithmetic means for arithmetically determining a desired fuel injection quantity conforming to said desired air-fuel ratio; andcontrol parameter arithmetic means for arithmetically determining control parameters for said fuel injection valves and said ignition means in conformance with said combustion mode on the basis of said engine rotation number and at least one of said accelerator pedal depression stroke, said intake air quantity and said desired fuel injection quantity.