Patent ID: 6474275
Filing Date: 2002-11-05
Classification: F02B,F02M,Y02T

Abstract:
A two-stroke engine comprising:a cylinder; a piston movable in said cylinder; an exhaust device and an inlet device communicating with respective outlet and inlet ports of said cylinder; a blower connected to said cylinder for sending a stream of scavenging air into said cylinder; and a device defining an additional volume communicating with said cylinder and said blower through at least one closable opening device, said at least one closable opening device allowing the scavenging air from said blower to be delivered into said device defining the additional volume, wherein a movement of said at least one closable opening device is controllable so that said at least one closable opening device is one of synchronous with and phase-shifted with respect to a movement of the piston in the cylinder, wherein gases burnt during a combustion phase compress air located in the device defining the additional volume by at least partially entering the device defining the additional volume, and wherein a mixture of the air and the burnt gases is trapped under pressure in the device defining the additional volume in a subsequent phase of discharge of burnt gases from said cylinder, said mixture entering the cylinder during an induction phase.