Patent ID: 6988030

Claim:
An injection control system of an internal combustion engine, the injection control system comprising: determining means for determining whether a learning condition for performing an injection quantity learning operation is established; commanding means for commanding an injector to perform a single injection into a specific cylinder of the engine when the learning condition is established; measuring means for measuring a state variation of the engine caused by performing the single injection; calculating means for calculating a correction value for increasing or decreasing a command injection quantity of the single injection, which is outputted to the injector, based on the measured state variation of the engine; and correcting means for correcting the command injection quantity by increasing or decreasing the command injection quantity in accordance with the correction value, wherein the calculating means sets at least one of a modification value for modifying the correction value and a modification speed, at which the correction value is modified, to a greater value in the case where the command injection quantity is increased in the correction than in the case where the command injection quantity is decreased in the correction.