| 摘要 |
PURPOSE:To reduce the loss of pumping energy in a way of having exhaust pressure in the late stage of exhaust dropped to some extent, by rotating a turbine in a turbosupercharger by means of exhaust gases in the initial stage of exhaust, while letting the exhaust gases in the late stage of exhaust go around the turbosupercharger. CONSTITUTION:At the vicinity of a bottom dead center (BDC) shifting into an exhaust stroke, a first exhaust valve 9 is opened, and a second exhaust valve 10 is as well opened after the elapse of a specified period of time, while at the late stage of the exhaust troke, the first exhaust valve 9 is closed and the second exhaust valve 10 is as well closed in and around a top dead center (TDC) shifting into a suction stroke. At a first exhaust passage 11, a turbine 13a of a trubosupercharger 13 is parallelly installed, while at a second exhaust passage 12, an auxiliary catalyzing device consisting of an oxidizing catalyzer for HC emission control use is parallelly installed, and these exhaust passages 11 and 12 join together at a collecting exhaust passage 15 as well as a main catalyzing device 16 consisting of a ternary catalyzer is parallelly installed in this collecting exhaust passage 15. |
