CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE

An internal combustion engine comprises a hydrocarbon feed valve (15) arranged in an engine exhaust passage and a booster pump (60) for boosting an injection pressure of the hydrocarbon feed valve (15). The hydrocarbon feed valve (15) performs NO X removal injection and clogging prevention injection. A boosting action of the injection pressure by the booster pump (60) and the NO X removal injection are controlled so that the boosting action of the injection pressure by the booster pump (60) and the NO X removal injection are not performed simultaneously, and the boosting action of the injection pressure by the booster pump (60) and said clogging prevention injection are allowed to be performed simultaneously.