| 摘要 |
PURPOSE:To prevent oil from rising to supercharged cylinders under low load with a throttle valve lowered in the degree of opening, by providing a supercharging pressure control valve to release compressed air depending on the pressure downstream to the throttle valve. CONSTITUTION:Under high load with a throttle valve 22 heightened in the degree of opening, a control valve 24 is not opened because the pressure downstream to the throttle valve is not lower than the atmospheric pressure. Under low load with the throttle valve 22 lowered in the degree of opening, the control valve 24 is opened because the pressure downstream to the throttle valve 22 has a large negative magnitude, so that compressed air upstream to the throttle valve is released. The pressure difference between the upstream and downstream sides of the throttle valve 22 is thus prevented from becoming large. |
