Patent ID: 6508214
Filing Date: 2003-01-21
Classification: F02D,Y02T

Abstract:
An exhaust control for an exhaust valve of an internal combustion engine, the engine having at least one combustion chamber, an intake passage leading to the at least one combustion chamber for providing air thereto, a fuel supply for supplying fuel to the combustion chamber, and an exhaust port leading from the combustion chamber for routing exhaust products therefrom, the valve cooperable with the exhaust port and movable between a first position for delaying the closing of the exhaust port and a second position for advancing the closing of the exhaust port, the exhaust control including means for moving the valve between the first position and the second position and control means for moving the valve in a cleaning operation at least partially between the first position and the second position, the valve performing a first cleaning operation when the engine speed first exceeds a first predetermined speed that is below 6000 RPM while the engine is within a predetermined range and the valve performing a second cleaning operation when the engine speed falls below a second predetermined speed that is above the first predetermined speed after the engine speed has exceeded an upper limit of the predetermined range.