| 摘要 |
A four cycle internal combustion engine is provided with a system for introducing fluid under pressure to a lower region of the combustion chamber, especially during the intake stroke of the piston. The normal gasoline and air charge enters the upper portion of the combustion chamber through a conventional intake valve, and this charge is ignited by suitable means following the compression stroke. The auxiliary fluid is introduced to the lower chamber through a conical baffle extending downwardly from the head of the cylinder, and this baffle cooperates with a conically shaped recess or cavity in the head of the piston to define the lower region of the combustion chamber. An auxiliary intake valve is provided in the cylinder head so that this auxiliary fluid may be so introduced at the proper time during the cycle of operation of the engine. Preferably, such auxiliary fluid is introduced in inverse proportion to the volume rate of flow of conventional gasoline and air charge. The ratio permits the use of an auxiliary fluid such as air to assure complete combustion of the gasoline vapor thereby improving the pollution control particularly during that phase of operation when the engine had been throttled back, as for example when a vehicle powered by such an engine is coasting downhill.
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