| 摘要 |
PROBLEM TO BE SOLVED: To raise a supercharging pressure in starting the operation of an electric supercharger 2 without interference by a bypass valve 16.SOLUTION: An internal combustion engine 1 includes a compressor 5 of a turbo supercharger 3 and an electric supercharger 2 in series in an intake passage 11. The electric supercharger 2 includes a bypass passage 15 and a bypass valve 16 for bypassing the electric supercharger 2 so that the electric supercharger 2 is prevented from becoming ventilation resistance during a non-operation period. When target torque is in a non-supercharge region and the rotating speed is lower than a prescribed rotating speed, the bypass valve 16 is retained at an intermediate opening. Thus, when an accelerator pedal is actuated to transfer the target torque to a supercharging region, the bypass valve 16 is immediately fully closed simultaneously with the start of the operation of the electric supercharger 2, and supercharging pressure is quickly raised. |
