| 摘要 |
PURPOSE:To supply secondary air of a suction system sufficiently from the beginning of deceleration by bypassing a fuel supply device for opening a control valve furnished at an air passage opening to the downstream side from the time of a high load operation state. CONSTITUTION:At the suction air passage 1 of an engine, an air passage 4 is provided to bypass a low load carburetter 2 and a high load carburetter 3 and open to the downstream side 4a, and equipped with a control valve 6. The control valve 6 is composed of a valve body 7f connected to a diaphragm of a diaphragm device 7. The exhaust pressure in an exhaust passage 10 is led to the first chamber 7c of the diaphragm device 7 via an exhaust passage 9, and the second chamber 7b is conducted to the open air via a nonreturn valve 8g and an orifice 8h. At the time of a high load, the exhaust pressure is increased, and the control valve 7f is opened until the open air is sufficiently introduced via the orifice 8h from the beginning of deceleration. |
