| 摘要 |
PURPOSE:To avoid the bad influence due to prerevolution while securing the responsiveness on the start of the operation of a secondary side turbosupercharger by utilizing the prerevolution in the ordinary time, and prohibiting the prerevolution when the time in which the secondary side exhaust turbosupercharger is in prerevolution is over a prescribed time. CONSTITUTION:A primary side exhaust turbosupercharger 9 which is operated at least in low speed revolution for an engine 1 and a secondary side exhaust turbosupercharger 10 which is operated only in high speed revolution are installed. The turbosupercharger 10 is previously put into prerevolution by a leak valve 13 before operation. In this case, a prerevolution prohibiting means 35 for prohibiting the prerevolution when the prerevolution time of the supercharger 10 is over a prescribed time is installed. Accordingly, when the prerevolution is carried out for a prescribed time or more, the bad influence such as the breakage of the secondary side turbosupercharger can be suppressed, since the prerevolution is suppressed. |
