Patent ID: 6065432
Filing Date: 2000-05-23
Classification: F01L,F02B,Y02T

Abstract:
A method of operating a two-stroke internal combustion engine, said method comprising the steps of:compressing and combusting a fresh charge within a cylinder as a piston ascends towards a top dead centre;expanding combustion products in the cylinder as the piston descends from the top dead center;exhausting spent gases from the cylinder through an inlet-outlet port uncovered by an upper edge of the piston, an inlet-outlet passage and a slide valve to an exhaust pipe;scavenging and filling the cylinder with a compressed fresh charge admitted through a scavenging port when the piston approaches a bottom dead centre, wherein when the piston is near the bottom dead centre the inlet-outlet passage is disconnected by the slide valve from the exhaust pipe and connected through the slide valve to the inlet pipe,wherein prior to the filling of the cylinder, the fresh charge is admitted into a crankshaft chamber through the slide valve, the inlet-outlet passage and the inlet-outlet port uncovered by the lower edge of the piston ascending towards the top dead centre, the steps of scavenging and filling the cylinder being performed by passing the charge from the crankshaft chamber.