Patent ID: 6158215
Filing Date: 2000-12-12
Classification: F02B,F02D,Y02T

Abstract:
An internal combustion engine comprising:a cylinder structure having an inside surface defining a cylinder bore having an axis, the inside surface having an exhaust port with an axial extent along the axis of the cylinder bore;a piston axially reciprocable in the cylinder bore and adapted to open and close the exhaust port;an exhaust passage extending from the exhaust port, the exhaust passage having a resonance port;a resonance chamber in fluid communication with the exhaust passage through the resonance port;a single port valve mounted adjacent the exhaust port and the resonance port, the port valve being adjustable between a first position, in which the port valve restricts the axial extent of the exhaust port and exposes the resonance port, and a second position, in which the port valve exposes the exhaust port throughout its axial extent and occludes the resonance port;a valve control operatively connected to the port valve and operable to adjust the port valve between the first and second positions in response to an engine parameter.