| 摘要 |
PURPOSE:To enable the reliable and early detection of the production of an abnormal pressure, by installing a means which holds a valve, actuating through the detection of a pressure abnormality, in the actuating position, and displays the operation thereof in linkage with that of the valve at an abnormal time. CONSTITUTION:When a feed pressure is increased by a compressor 4 and a feed pressure rises as a result of the failure of bypassing of an exaust gas due to a trouble on a waste gate valve 8 or some trouble, a diaphragm 10b actuates in a direction, in which a valve 10d opens, against the force of a spring to bring a leaf spring 10h to invert. When the leaf spring 10h inverts, a contact 13a makes contact with a contact 13b, which resluts in enabling to notifying an operator of a trouble by means of a display device not shown. Simultaneously, if the leaf spring 10h inverts, the valve 10d is prevented from being firmly adhered to a valve seat 10i, a control negative pressure of a throttle actuator 3 is released to the air through a negative pressure inlet 10g, a negative pressure chamber 10e, and the valve seat 10i, and a secondary slot valve 2 is moved in a direction, in which it is closed, to reduce a feed pressure. |
