Patent ID: 6094915
Filing Date: 2000-08-01
Classification: F01B,F02B

Abstract:
Apparatus for reducing pollution of a cyclic internal combustion engine, comprising:a constant volume independent combustion chamber fluidly connected to a buffer volume of compressed air via a pipe, said buffer volume being fluidly connected to a compressor;a first flap positioned in said pipe for controlling the opening and closing thereof;a fuel injector structured and arranged to produce an air/fuel mixture before introducing said mixture into the combustion chamber;an expansion chamber equipped with a main piston connected to a crank shaft, and with a secondary piston mounted in opposition;said expansion chamber being fluidly connected to the combustion chamber via a duct having a second flap positioned in said duct;the movement of said secondary piston being controlled to accompany the main piston over part of its downstroke so as to make the start of expansion pressure, in a minimum volume, coincide with a crank angle and connecting rod angle of inclination, which produce an optimum expansion mean tangential force; andan air injector fluidly connected to the combustion chamber and to a source of highly pressurized compressed air;means for actuating said air injector during low power operation, when operation of said fuel injector is discontinued, and after a charge of hot compressed air contained in the buffer volume has been admitted into the combustion chamber, whereby actuation of said air injector lets a small amount of compressed air contact said hot air, expand, and increase in pressure to produce a power stroke.