Patent ID: 7500475
Filing Date: 2009-03-10
Classification: F02D,F02M,Y02T

Abstract:
1. A method of operating an engine, the engine having a housing with a combustion chamber, a piston disposed adjacent the combustion chamber, a crankshaft connected to the piston, an intake valve associated with the combustion chamber, and an exhaust valve associated with the combustion chamber, the method comprising: opening the intake valve between about 15 degrees of crankshaft rotation before a power stroke ends and the end of the power stroke; closing the intake valve after at least about 65 degrees of crankshaft rotation after the end of the power stroke and before a subsequent exhaust stroke of the piston ends; causing the exhaust valve to be open for part of an intake stroke of the piston; and closing the exhaust valve at least about 30 degrees of crankshaft rotation after the intake stroke begins.