1. A fuel injection control system, comprising: command storage means for storing a command injection amount and an injection frequency with which fuel injection means is to perform injection corresponding to engine control parameters; command injection amount determination means for determining the command injection amount and the injection frequency by referring to said command storage means on the basis of current engine control parameters; and correction amount learning means for learning a correction amount relative to the command injection amount so that the actual amount of injection performed actually by said fuel injection means corresponds with the command injection amount, wherein said command storage means stores a command for pre-learning for a pre-learning time which is a time before said correction amount learning means learns a correction amount, and a command for post-learning for a post-learning time which is a time after said correction amount learning means learns a correction amount; and said command injection amount determination means refers to the command for pre-learning at the pre-learning time, and refers to the command for post-learning at the post-learning time.