| 摘要 |
<p>PURPOSE:To prevent reduction of supercharged pressure at high land and increase of back pressure at low load by means of a pressure control system in which a supercharged pressure, the pressure on the downstream of a throttle valve, and a standard pressure are used. CONSTITUTION:During low-load where the opening degree of a throttle valve 19 is little, a chamber 11 is under the atmospheric pressure, and each negative pressure is introduced into chambers 13 and 18, and a valve port 24 is closed through the pressure control 16, and a bypass valve 8 is opened. In case of intermediate load, a turbine 1b is driven, and a supercharged state is formed by a compressor 1a. When the pressure on the downstream of the throttle lowers to below a standard pressure, the bypass valve 8 is closed by a spring 14, since a pressure control valve 16 is closed and the differential pressure between the chambers 11 and 13 of an actuator 9 is small. In case of high load, the supercharged pressure increases over the standard pressure, and the valve port 24 is opened, and each pressure in the chambers 13 and 18 is made equal to the standard pressure. Therefore, a pressure difference is generated between the supercharged pressure in the chamber 11 and the standard pressure in the chamber 13, and the bypass valve 8 is opened.</p> |
