Patent ID: 6578533
Filing Date: 2003-06-17
Classification: F02B,F02D,Y02T

Abstract:
A diesel-cycle engine comprising:a plurality of combustion cylinders; a first piston reciprocally mounted within each of said combustion cylinders, said piston presenting a first piston face defining one boundary of a combustion chamber within said combustion cylinder; a head covering said combustion cylinders and having a plurality of cylindrical recesses, each opening into a respective combustion cylinder; a second piston reciprocally mounted in each of said recesses, said second piston presenting a second piston face defining a second boundary of the combustion chamber; means for introducing a fuel-air mixture into the combustion chamber; and means for moving said second piston from a retracted position outward in said cylindrical recess, to an extended position, after said first piston has reached top dead center, during the beginning of the expansion stroke of said first piston, to reduce the volume of the combustion chamber and increase the compression ratio to a level causing auto-ignition of the fuel-air mixture.