Patent ID: 6536414
Filing Date: 2003-03-25
Classification: F02D,Y02T

Abstract:
A fuel injection control system for an internal combustion engine, comprising:required injection amount calculating means for calculating a required injection amount in accordance with a driving state of the internal combustion engine; and fuel injection control means for controlling driving of a fuel injection valve to inject a fuel based on the required injection amount, wherein the required injection amount calculating means calculates the required injection amount repeatedly with an interval shorter than an interval of injection, and the fuel injection control means executes fuel injection based on the required injection amount calculated just before start of fuel injection, and when the required injection amount of this time calculated by the required injection amount calculating means changes from the required injection amount of last time calculated by the required injection amount calculating means, a fuel injection time extends or shortens in accordance with a change amount between the required injection amount of this time and the required injection amount of last time, and the fuel injection control means sets an injection start timing so that the fuel injection is finished by a predetermined timing during an intake stroke, based on the required injection amount calculated at a predetermined timing before the start of the injection, and when the required injection amount is calculated by the required injection amount calculating means in a period from a timing of setting the injection start timing to the injection start timing, the fuel injection control means executes the fuel injection based on the required injection amount just before the injection start timing, and in a case where the injection start timing is set so that the fuel injection is finished by a predetermined timing in an intake stroke and the injection start timing is before a preset injection start regulation value, the fuel injection control means resets the injection start timing to the injection start regulation value, and resets an injection end timing after the predetermined timing in the intake stroke by using the injection start timing as a reference.