| 摘要 |
PURPOSE:To prevent the occurrence of knocking, by a method wherein, during full cylinder operation, air is fed to a first cylinder group, having a high compression ratio, at a low supercharge pressure, and to a second cylinder group, having a low compression ratio, at a high supercharge pressure. CONSTITUTION:When an electronic control part (ECU) 40 decides that full cylinder operation is needed, a valve lock mechanism 7 is released, and first and second superchargers 25 and 28 are actuated. A supercharge pressure produced by the first supercharger 25 is regulated through control of a first bypass valve 26. Meanwhile, a supercharge pressure by the second supercharger 28 is also regulated to a value higher than that of the first supercharger 25 through control of a second bypass valve 29. Air is fed to a first cylinder group A, having a compression ratio, at a low compression pressure and to a first cylinder group B, having a low compression ratio, at a high supercharge pressure. This prevents the occurrence of knocking during full cylinder operation. |
