| 摘要 |
A first compressor ( 1 a) which supercharges intake air is provided in the intake passage ( 6, 20, 21 ) of an internal combustion engine ( 12 ). The first compressor ( 1 a) is driven by the exhaust gas energy of the engine ( 12 ). A second compressor ( 2 a) driven by an electric motor ( 2 b), and a bypass valve ( 3 ) which bypasses the second compressor ( 2 a), are provided in the intake passage ( 7, 20, 21 ) between the first compressor ( 1 a) and the engine ( 12 ). The bypass valve ( 3 ) shifts from the open state to the closed state according to the operation of the second compressor ( 2 a). At this time, the bypass valve ( 3 ) starts closing at some time after startup of the second compressor ( 2 a) so that the intake air amount of the engine ( 12 ) is not deficient.
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