| 摘要 |
PURPOSE:To reduce a change-over shock in charging over to two turbo-chargers while preventing supercharging performance from deteriorating in one turbo- charger zone on a high ground. CONSTITUTION:When supercharging pressure detected by a supercharging pressure detecting sensor 30 is larger than a supercharging pressure judging value, the duty control of an exhaust bypass valve 41 is started on the step of the supercharging pressure reaching the supercharging pressure judging value, and when the supercharging pressure detected by the supercharging pressure detecting sensor 30 is smaller than the supercharging pressure judging value, the duty control of the exhaust bypass valve 41 can be started at the step of flow detected by a flow detecting means 60 reaching a flow judging value. Each duty control is carried out by a control reference changing-over means 61. |
