Abstract: An exhaust passage structure of an internal combustion includes a first merging passage, a second merging passage, and a third merging passage connecting a third gathering portion in which the exhaust gas flowing through the first merging passage and the exhaust gas flowing through the second merging passage gather and a turbine of a turbocharger. The first merging passage and the second merging passage have respective narrowed portions in which passage cross-sectional areas are minimized. When a total value of passage cross-sectional areas of inlets of exhaust ports in one cylinder is set as a reference passage cross-sectional area A, and the passage cross-sectional areas of the narrowed portions of the first merging passage and the second merging passage are set as narrowed cross-sectional areas B, the exhaust passage structure is configured such that the relationship of 0.5?(B/A)?1 is established.

Abstract: An exhaust passage structure of an internal combustion includes a first merging passage, a second merging passage, and a third merging passage connecting a third gathering portion in which the exhaust gas flowing through the first merging passage and the exhaust gas flowing through the second merging passage gather and a turbine of a turbocharger. The first merging passage and the second merging passage have respective narrowed portions in which passage cross-sectional areas are minimized. When a total value of passage cross-sectional areas of inlets of exhaust ports in one cylinder is set as a reference passage cross-sectional area A, and the passage cross-sectional areas of the narrowed portions of the first merging passage and the second merging passage are set as narrowed cross-sectional areas B, the exhaust passage structure is configured such that the relationship of 0.5?(B/A)?1 is established.

Abstract: When there is a restart request to an engine, an electronic control unit controls a wastegate valve to a fully open position on condition that a speed of a vehicle is less than a threshold. When the vehicle speed is not less than the threshold, the electronic control unit restarts the engine and controls the wastegate valve in the closing direction until a desired torque is generated.

Abstract: When there is a restart request to an engine, an electronic control unit controls a wastegate valve to a fully open position on condition that a speed of a vehicle is less than a threshold. When the vehicle speed is not less than the threshold, the electronic control unit restarts the engine and controls the wastegate valve in the closing direction until a desired torque is generated.

Abstract: A wastegate valve device for a turbocharger includes a valve body, a swing arm configured to support the valve body, a rotating shaft to which the swing arm is fixed, a drive arm fixed to the rotating shaft, and a rod connected to the drive arm. The drive arm includes a fixed portion to which the rotating shaft is fixed, a first extension portion where the rod is connected, and a second extension portion extending on the opposite side of the first extension portion. The turbine housing is provided with a stopper with which the second extension portion abuts at the time when the valve body is distanced from the wastegate port due to a rotation of the rotating shaft in a valve-opening direction.

Abstract: A wastegate valve device for a turbocharger includes a valve body, a swing arm configured to support the valve body, a rotating shaft to which the swing arm is fixed, a drive arm fixed to the rotating shaft, and a rod connected to the drive arm. The drive arm includes a fixed portion to which the rotating shaft is fixed, a first extension portion where the rod is connected, and a second extension portion extending on the opposite side of the first extension portion. The turbine housing is provided with a stopper with which the second extension portion abuts at the time when the valve body is distanced from the wastegate port due to a rotation of the rotating shaft in a valve-opening direction.