| 摘要 |
A six-stroke engine includes a cylinder, a piston, a cylinder head, a combustion chamber, an intake port, an exhaust port, an intake valve, an exhaust valve, a fuel injector, and an ignition plug. The six-stroke engine includes a valve gear that operates the intake valve and the exhaust valve to execute an intake stroke, a compression stroke with ignition, an expansion stroke with combustion, an exhaust stroke, an expansion stroke without combustion, and a compression stroke without ignition. The valve gear opens only for a predetermined period of time while the piston is located on a top dead center side, at least one of the intake valve and the exhaust valve, within a period from the exhaust stroke to the intake stroke. A valve overlap state (B) is produced at least once within the period from the exhaust stroke to the intake stroke. Gas exchange in the cylinder is properly performed, and the thermal efficiency becomes high. Additionally, a high cooling effect can be obtained using only the components of the engine. |
