Two-cycle internal combustion engine

Abstract

A method for operating a two-cycle internal combustion engine wherein in the scavenging stroke the air-fuel mixture charged into the cylinder forms a stratum adjacent to a piston and the stratum of the air-fuel mixture is made into contact with the stratum of the residual gases remote from the piston. Alternately, in the scavenging stroke the rich mixture is first charged into the cylinder immediately above the piston and then the lean mixture is charged into the cylinder immediately above the piston so that the strata of the lean and rich mixtures and the residual gases may be formed in the order named from a portion close to the piston within the cylinder. The decomposition of part of the air-fuel mixture or the rich air-fuel mixture is caused by the heat contained in the residual gases so that the chemically activated radicals are produced. In the compression stroke the air-fuel mixture or the rich air-fuel mixture containing these radicals is compressed to the compression ratio of between 4 and 10 and ignited and burned by the radicals mentioned above. The engine may operate with a low compression ratio. The engine may be made light in weight as compared with the diesel engines. The compression combustion is effected. The positive ignition may be ensured and the irregular and uncomfortable noise and vibration may be minimized. In addition, a considerable fuel economy may be attained and the emission of HC may be minimized. The two-cycle internal combustion engines adapted for carrying out the above method are also disclosed.

Dependencies are inferred from the claim text.