| 摘要 |
PURPOSE:To provide exact EGR according to engine load, by controlling negative pressure, led in a negative pressure chamber of a diaphragm for controlling an EGR valve, through a pressure control valve interlocked with a movable member for controlling fuel. CONSTITUTION:An exhaust manifold 10 and suction tube 6 of an engine 1 are connected with each other through an EGR conduit 14, and the amount of recycling exhaust gas is controlled by an EGR value 12 which is driven by a diaphragm 20 set to the conduit 14. The diaphragm 20 is driven by negative pressure led in a negative pressure chamber 22, the negative pressure being introduced from a pressure take- off port 43 of a negative pressure control valve 37 through a water temperature sensing valve 63, conduit 62, pressure reversing valve 59 and conduit 58. The pressure control valve 37 leads negative pressure from a vacuum pump 32 into a pressure chamber 40 through a conduit 36. Negative pressure output to the port 43 is controlled by adjusting the aperture of a valve element 46 through change of a plunger 53, that is, the force of a coil spring 47 with the aid of an accelerator link 56. |
