| 摘要 |
<p>PURPOSE:To increase the supercharge pressure without sacrifice of the durability of engine while improving the supercharge pressure characteristic under low speed rotation area through simple structure by communicating the pressure lead path with two paths selectively through switching of changeover valve with correspondence to the engine operating condition. CONSTITUTION:Under low load steady engine operation, a throttle switch 52 will open to communicate between a pressure lead path 34 and second path 46 through a changeover valve 48. Then high supercharge pressure is functioned through second port 41 into the pressure chamber 24 of actuator 22 to open a waste gate valve 20 through increase of supercharge pressure. Under acceleration, the pressure lead path 34 and first path 44 are communicated. Low supercharge pressure is functioned through first port 38 into the pressure chamber 24 thus to open the valve 20 through increase of supercharge pressure. Here, the supercharge pressure to be fed into an internal-combustion engine 12 will increase by the amound of the differential pressure against first port 38 thus to realize high supercharge pressure characteristic.</p> |
