Patent ID: 6334428
Filing Date: 2002-01-01
Classification: F02D,Y02T

Abstract:
A system for controlling a fuel injection timing for a direct injection spark ignition internal combustion engine which is operated at an ultra-lean burn combustion or at a pre-mixture charged combustion, comprising:engine operating condition detecting means for detecting operating conditions of the engine at least including an engine speed and an engine load; fuel injection amount determining means for determining a fuel injection amount based at least on the detected engine speed and the engine load of the engine operating conditions; desired fuel injection start timing determining means for determining a desired fuel injection start timing at which injection of the determined fuel injection amount should be started based at least on the detected engine speed and the engine load; fuel injection start timing limit determining means for determining a fuel injection start timing limit by which injection of the determined fuel injection amount should be started based at least on the detected engine speed in accordance with predetermined data so as to avoid smoke from occurring in the engine; fuel injection timing comparing means for comparing the desired fuel injection start timing with the fuel injection start timing limit; fuel injection starting timing correcting means for correcting at least one of the desired fuel injection start timing and the fuel injection amount, when the desired fuel injection start timing is found to exceed the fuel injection start timing limit in an advanced direction in crank angle, such that the fuel injection is started by the fuel injection timing limit; and fuel injecting means for injecting the determined fuel injection amount based on the determined fuel injection start timing.