Abstract: A turbocharger includes a turbine housing, and first, second, and third exhaust passages connected to the turbine housing. The first exhaust passage is connected to a first cylinder of cylinders of an internal combustion engine. An exhaust gas discharged from the first cylinder flows through the first exhaust passage. The second exhaust passage is connected to a second cylinder of the cylinders. An exhaust gas discharged from the second cylinder flows through the second exhaust passage. The third exhaust passage is connected to a third cylinder of the cylinders. An exhaust gas discharged from the third cylinder flows through the third exhaust passage. The exhaust gas flowing from the first exhaust passage and the exhaust gas flowing from the second exhaust passage join together inside the turbine housing.

Abstract: As for a control device for a turbocharger including a turbine, disposed in an exhaust passage of an internal combustion engine, and a compressor, disposed in an intake passage of the internal combustion engine and driven by the turbine, the control device includes a control unit configured to control the turbine such that a boost pressure of the turbocharger in the intake passage becomes equal to or lower than an allowable value, a first calculation unit configured to calculate a decrease amount of a compressor efficiency of the compressor, and a second calculation unit configured to calculate the allowable value based on an intake air amount in the intake passage, in accordance with the decrease amount.

Abstract: A turbocharger includes a turbine housing, and first, second, and third exhaust passages connected to the turbine housing. The first exhaust passage is connected to a first cylinder of cylinders of an internal combustion engine. An exhaust gas discharged from the first cylinder flows through the first exhaust passage. The second exhaust passage is connected to a second cylinder of the cylinders. An exhaust gas discharged from the second cylinder flows through the second exhaust passage. The third exhaust passage is connected to a third cylinder of the cylinders. An exhaust gas discharged from the third cylinder flows through the third exhaust passage. The exhaust gas flowing from the first exhaust passage and the exhaust gas flowing from the second exhaust passage join together inside the turbine housing.

Abstract: As for a control device for a turbocharger including a turbine, disposed in an exhaust passage of an internal combustion engine, and a compressor, disposed in an intake passage of the internal combustion engine and driven by the turbine, the control device includes a control unit configured to control the turbine such that a boost pressure of the turbocharger in the intake passage becomes equal to or lower than an allowable value, a first calculation unit configured to calculate a decrease amount of a compressor efficiency of the compressor, and a second calculation unit configured to calculate the allowable value based on an intake air amount in the intake passage, in accordance with the decrease amount.

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.