Exhaust control valve for engine

The two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, means for sensing the stopping of said engine, and cleaning means for operating said exhaust control valve means through at least one cycle of movement between its positions upon stopping of said engine, said cleaning means operating said exhaust control valve means through a greater range of movement than said exhaust control valve means moves between its first and second positions.

A method of operating a two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, said method comprising the steps of sensing the stopping of said engine, sensing another condition of said engine, and operating said exhaust control valve means through at least one cycle of movement between its positions upon stopping of said engine for cleaning and if a certain other condition of the engine is sensed.

A method of operating a two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, said method comprising the steps of sensing the stopping of said engine, and operating said exhaust control valve means through at least one cycle of movement through a greater range of movement for a cleaning operation than the exhaust control valve means moves between its first and second positions upon stopping of the engine.

A two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, means for sensing the stopping of said engine, and means operating said exhaust control valve means through at least one cycle of movement between its positions upon stopping of said engine with said exhaust control means being positioned in its second position at the completion of such operation.

A two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, means for sensing the stopping of said engine, engine condition sensing means, and cleaning means operating said exhaust control valve means through at least one cycle of movement between its positions upon stopping of said engine and a number of additional cycles dependent upon the condition of the engine sensed by said engine condition sensing means when said engine was running.

A method of operating a two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, said method comprising the steps of sensing the stopping of said engine, and operating said exhaust control valve means through at least one cycle of movement between its positions upon stopping of said engine for cleaning and returning said exhaust control valve in its first position at the completion of said cleaning cycle.

A method of operating a two cycle internal combustion engine having a cylinder block having a cylinder bore, a piston reciprocating in said cylinder bore, an exhaust port formed in said cylinder block extending from said cylinder bore for exhausting combustion products from said cylinder bore, exhaust control valve means cooperable with said exhaust port and movable between at least a first position for delaying the closing of said exhaust port and a second position for advancing the closing of said exhaust port, said method comprising the steps of sensing the stopping of said engine, sensing another condition of said engine, and operating said exhaust control valve means through at least one cycle of movement between its positions upon stopping of said engine for cleaning and a number of additional cycles depending upon the other engine condition sensed.