CONTROLLER OF MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

To provide a controller of a multi-cylinder internal combustion engine capable of determining air-fuel ratio imbalance between cylinders accurately.SOLUTION: A controller of a multi-cylinder internal combustion engine comprises an electric supercharger with a motor that rotates a turbine arranged in an exhaust passage, and an air-fuel ratio sensor arranged downstream of the exhaust passage with respect to the turbine. The controller comprises: a determination unit that executes an air-fuel ratio imbalance determination between cylinders that determines the degree of variation in an air-fuel ratio of exhaust gas of each cylinder based on an output value of the air-fuel ratio sensor, and a motor control unit that when executing the air-fuel ratio imbalance determination between cylinders, controls the motor so that a rotational speed of the turbine is lower than that immediately before the execution of the air-fuel ratio imbalance determination between cylinders.SELECTED DRAWING: Figure 4 【課題】精度よく空燃比気筒間インバランス判定を行うことができる多気筒内燃機関の制御装置を提供することを課題とする。【解決手段】排気通路に配置されたタービンを回転させるモータを有した電動過給機、前記タービンよりも前記排気通路の下流側に配置された空燃比センサ、を備えた多気筒内燃機関の制御装置であって、前記空燃比センサの出力値に基づいて各気筒の排気の空燃比のばらつき度合いを判定する空燃比気筒間インバランス判定を実行する判定部と、前記空燃比気筒間インバランス判定の実行の際には、前記空燃比気筒間インバランス判定の実行の直前よりも前記タービンの回転速度が低下するように前記モータを制御するモータ制御部と、を備えた多気筒内燃機関の制御装置。【選択図】図４