Patent ID: 6302082
Filing Date: 2001-10-16
Classification: F02D,F02P,Y02T

Abstract:
A system for controlling an ignition 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;fuel injecting means for injecting fuel based on the determined fuel injection amount into a cylinder of the engine;ignition timing determining means for determining an ignition timing based at least on the detected engine speed and the engine load of the engine operating conditions;desired fuel injection end timing determining means for determining a desired fuel injection end timing at which injection of the determined fuel injection amount should be ended such that the fuel injecting means ends the fuel injection in response to the determined desired fuel injection end timing;margin determining means for determining a difference between the determined desired fuel injection end timing and the determined ignition timing and for determining whether the difference is less than a predetermined value indicative of margin;ignition timing correcting means for correcting the determined ignition timing by the predetermined value when the difference is determined to be less than the predetermined value; andignition means for igniting an air-fuel mixture made of the injected fuel mixed with air based at least on one of the determined ignition timing and the corrected ignition timing.