| 摘要 |
A four-cycle internal combustion engine having an exhaust outlet opening in the cylinder wall provided with an exhaust edge disposed in a range between 60 DEG and 110 DEG of crank shaft rotation from the top dead center position of the top of said piston, an exhaust valve in the head end of the cylinder communicating with an exhaust recycling conduit and a flow valve intercommunicating with said exhaust gas recycling conduit and an intake manifold for modulating flow of recycled exhaust gases in relation to fuel being conducted to a fuel inlet valve in head of cylinder. Also an engine wherein an exhaust valve is held closed in spring loaded relation wtih said outlet opening and adjusted to provide exhaust outflow to atmosphere according to combustion pressure in the cylinder when the piston passes it. Also a second conduit communicating with gas recycling conduit with an exhaust manifold disposed to receive exhaust from said exhaust outlet opening, said second conduit conducts part of exhaust gases from exhaust valve in the head to said exhaust manifold whereby a portion of the exhaust from said exhaust valves are mixed with the hot gases from said exhaust outlet and are thereby burned in said exhaust manifold. Also a modification wherein an exhaust manifold communicates with exhaust valve in the head and exhaust from said outlet opening is mixed therewith for after burning then exhausted to atmosphere. Also method for operating a four-cycle internal combustion engine exhausting hot efficiently burned products to atmosphere via an exhaust manifold and recycling some inefficiently burned products to the intake manifold for mixture with incoming fuel for reintroduction into the combustion chambers and conducting the rest of the inefficiently burned products into said exhaust manifold for mixing with and combustion in the presence of said hot efficiently burned products of said exhaust manifold. Also specific valve and port timing relative to the movement of the piston in the cylinder for the alleviation of nitrogen oxide formation includes a relationship between the piston and an exhaust outlet opening in the side wall of the cylinder which exhaust outlet opening is positioned as indicated heretofore whereby gases under high pressure are quickly exhausted to atmosphere in a stratum which separates the hot efficiently burned gases from the most inefficiently burned gases in the quench areas of the combustion chamber and thereby quickly exhausting a substantial amount of the heat from the combustion chamber so as to minimize recycling heat in the combustion chamber and to hold the combustion chamber at a temperature sufficiently low during the combustion to prevent the formation of nitrogen oxides.
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