CONTROLLER OF INTERNAL COMBUSTION ENGINE

To provide a controller of an internal combustion engine capable of excellently determining the necessity of switching an injection mode between a homogeneity improvement mode and a knock suppression mode.SOLUTION: A controller of an internal combustion engine comprises: an injection mode switching unit 301 that switches an injection mode between a homogeneity improvement mode of injecting fuel within a range including an intake stroke and a compression stroke, and a knock suppression mode of injecting fuel within the range including the intake stroke and the compression stroke so that the number of times of injection in the compression stroke is larger than that in the homogeneity improvement mode; a knock suppression degree calculation unit that calculates a knock suppression degree that is determined according to an amount of retardation of ignition timing for suppressing the occurrence of knocking; and a state determination unit 303 that determines the necessity of switching the injection mode based on the knock suppression degree calculated by the knock suppression degree calculation unit.SELECTED DRAWING: Figure 3 【課題】均質向上モードとノック抑制モードとの間の噴射モードの切換の要否を良好に判定することが可能な内燃機関の制御装置を提供する。【解決手段】内燃機関の制御装置は、吸気行程と圧縮行程とを含む範囲内で燃料を噴射する均質向上モードと、吸気行程と圧縮行程とを含む範囲内で、かつ、均質向上モードよりも圧縮行程における噴射回数が増加するように燃料を噴射するノック抑制モードと、の間で噴射モードを切り換える噴射モード切換部３０１と、ノッキングの発生を抑制するための点火時期の遅角量に応じた定まるノック抑制度を算出するノック抑制度算出部と、ノック抑制度算出部により算出されたノック抑制度に基づいて、噴射モードの切換の要否を判定する状態判定部３０３と、を備える。【選択図】図３