| 摘要 |
PURPOSE:To prevent production of graphite, white smoke and misfiring when travelling on high land, by providing EGR control valve for controlling the flow in EGR path and a negative pressure regulating valve for feeding fluid pressure into the negative pressure chamber of said control valve. CONSTITUTION:An exhaust gas recirculation control valve 12 will control the exhaust gas flow in exhaust gas recirculation path. An absolute pressure valve 60 will produce constant fluid pressure to the output port 62. A negative pressure regulating valve 30 will feed negative pressure which will decrease with correspondence to increase of load of Diesel engine 1 into the negative pressure chamber 48. Consequently, the negative pressure produced in the pressure regulating chamber 36 is fed into the negative pressure chamber 22 of said valve 12. Since EGR rate is highly compensated with correspondence to the engine load, production of graphite, white smoke and misfiring can be prevented under high land travelling while NOx in exhaust gas can be reduced. |
