CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

To provide a control device of an internal combustion engine which can suppress the deterioration of a combustion state even if dither control is performed at multi-injection processing.SOLUTION: When a temperature rise requirement of a three-dimensional catalyst 24 arises, a CPU 32 performs dither control for setting one of cylinders #1 to #4 to a rich combustion cylinder for enriching an air-fuel ratio higher than a theoretical air-fuel ratio, and setting the residuals to lean combustion cylinders for leaning air-fuel ratios lower than the theoretical air-fuel ratio. The CPU 32 also performs multi-injection processing for performing a plurality of times of fuel injections in one cylinder within one combustion cycle according to an operation point of an internal combustion engine 10. When the CPU 32 performs the dither control at the multi-injection processing, the CPU sets a value which is obtained by dividing an injection amount of the rich combustion cylinder by an injection amount of the lean combustion cylinder so that fuel injection at a retardant side becomes small compared with fuel injection at an advance side.SELECTED DRAWING: Figure 1 【課題】マルチ噴射処理時にディザ制御を実行する場合であっても燃焼状態の悪化を抑制できるようにした内燃機関の制御装置を提供する。【解決手段】ＣＰＵ３２は、三元触媒２４の昇温要求が生じる場合、気筒＃１〜＃４のうちの１つを、理論空燃比よりもリッチとするリッチ燃焼気筒とし、残りを、理論空燃比よりもリーンとするリーン燃焼気筒とするディザ制御を実行する。また、ＣＰＵ３２は、内燃機関１０の動作点に応じて、１燃焼サイクル内で１つの気筒において複数回の燃料噴射を実行するマルチ噴射処理を実行する。ＣＰＵ３２は、マルチ噴射処理時にディザ制御を実行する場合、リッチ燃焼気筒の噴射量をリーン燃焼気筒の噴射量で除算した値を、進角側の燃料噴射と比較して遅角側の燃料噴射の方が小さくなるようにする。【選択図】図１