Patent ID: 8468999
Filing Date: 2013-06-25
Classification: F02D,Y02T

Abstract:
1. A fuel injection control system of an internal combustion engine including a fuel injection valve operable to inject fuel directly into a cylinder and perform a plurality of fuel injections on an intake stroke, and a crank angle signal generating portion that generates a detection signal each time a predetermined crank angle is reached, comprising: a required injection setting portion that calculates a required number of injections and required injection times with regard to said plurality of fuel injections, based on operating conditions of the internal combustion engine; a rapid rotational speed change detecting portion that determines whether an amount of change of a rotational speed of the internal combustion engine is equal to or larger than a predetermined value, based on the detection signal received from the crank angle signal generating means; a rapid-change-time required injection setting portion that replaces the required injection setting portion to recalculate the required number of injections and the required injection times with regard to said plurality of fuel injections, when the rapid rotational speed change detecting portion determines that the amount of change of the rotational speed of the internal combustion engine is equal to or larger than the predetermined value; and an injection control portion that controls fuel injection of the fuel injection valve to suppress the difference between actual injection times and the required injection times, wherein: the rapid-change-time required injection setting portion converts each of the required injection times into an elapsed time from a signal-receiving point of receiving the detection signal immediately before reaching said each of the required injection times; and the injection control portion causes the fuel injection valve to inject fuel when the elapsed time elapses from the signal-receiving point of receiving the detection signal immediately before reaching said each of the required injection times.