| 摘要 |
PURPOSE:To improve exhaust gas recirculation performance and to improve exhaust gas purifying performance, by a method wherein, in a device in which an exhaust gas pipe before the inlet of a exhaust gas turbine is coupled to a feed pipe after the outlet of a compressor through an exhaust gas recirculating passage, a resonance pipe, a resonance volume, and a check valve are situated in the exhaust gas recirculating passage. CONSTITUTION:An exhaust gas pipe 22 before the inlet of an exhaust gas turbine 23 of an exhaust gas turbine supercharger 10 is coupled to a feed pipe 12 after the outlet of a compressor 11 through an exhaust gas recirculating passage 54 in which a solenoid valve 55 controlled by a controller 42 is provided. Through recirculation of a part of exhaust gas to the air supply side, an amount of an exhaust gas harmful matter (N0x) generated in a combustion chamber 24 is reduced. In this case, a resonance pipe 51, a resonance volume 52, and a check valve 53 are located, in order, from the exhaust pipe 23 side in the exhaust recirculating passage 54. The resonance pipe 51 and the resonance volume 52 are set so that they resonate in response to the slight fluctuation in pressure of exhaust gas in the exhaust gas pipe 22. The check valve 53 is so situated that exhaust gas is forced to flow only to the intake air pipe 12 side by means of an increased pressure on the resonance system side. |
