| 摘要 |
PURPOSE:To improve efficiency of an exhaust gas turbine by opening an exhaust valve at the initial stage of a piston-up-stroke in a compression stroke. CONSTITUTION:In the case of a compression stroke, an intake valve 14 is made to be either closed or opened until a piston 10 reaches the middle point 16, by being raised by the length (1) from a bottom dead point 13 and an exhaust valve 15 is made to be open. Pressurized air, having flown into or keeping on flowing into a cylinder 7 through the intake valve 14, flows out through the exhaust valve 15 during the initial up-stroke (l) in order to drive an exhaust gas turbine. When the piston 10 reaches the middle point 16, the intake valve 14 and the exhaust valve 15 kept to be open are closed, and in the case of gasoline engine, gasoline is injected from an injection nozzle 17. Either air or mixed air flowing into a cylinder is compressed between a stroke of L2=L1-l. Although the volumetric displacement of either air or mixed air becomes smaller than in the case of being compressed through the whole stroke L1 in such a case as the ordinary engine, intake air amount increase in aimed at by raising pressurization.
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