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US 6,202,626 B1Granted
Engine having combustion control system
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTakeshi Ito, Toshiharu Hanajima, Kenji Mori
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTakeshi Ito, Toshiharu Hanajima, Kenji Mori
Estimating the term…
An internal combustion engine that is comprised of a combustion chamber formed by a cylinder bore closed at one end by a cylinder head and by a piston reciprocating in the cylinder bore. At least one intake passage serves the combustion chamber through an intake port valved by an intake valve. A throttle valve is provided in the intake passage upstream of the intake port and is movable between an opened, full throttle position and a closed, idle position for controlling the flow through the intake passage into the combustion chamber. At least one exhaust passage serves the combustion chamber through an exhaust port. An exhaust valve controls the flow through the exhaust port. Valve actuating means are provided for operating the intake valve and the exhaust valve between their open and closed positions. The portion of the intake passage between the throttle valve and the intake port (intake passage volume) and the maximum volume of the combustion chamber when the piston is at its bottom dead center position (exhaust gas volume) are set to a predetermined ratio. The described constructions permit a very compact construction that permits the intake passage volume to be kept small to achieve the desired ratio.
An internal combustion engine comprising a combustion chamber formed by a cylinder bore closed at one end by a cylinder head and by a piston reciprocating in said cylinder bore, at least one intake passage serving said combustion chamber through an intake port valved by an intake valve, a throttle valve in said intake passage upstream of said intake port moveable between an opened, full throttle position and a closed, idle position for controlling the flow through said intake passage into said combustion chamber, the area between said throttle valve and said intake valve being devoid of other flow control valves, at least one exhaust passage serving said combustion chamber through an exhaust port, an exhaust valve for controlling the flow through said exhaust port, valve actuating means for operating said intake valve and said exhaust valve between their open and closed positions, the ratio between the volumes of the portion of said intake passage between said throttle valve and said intake port and the maximum volume of said combustion chamber when said piston is at bottom dead center position being set to a predetermined ratio, said throttle valve being moveably supported within a throttle body separate from but attached to said cylinder head, said throttle valve being disposed inwardly of a plane parallel to said cylinder bore axis and containing the outer peripheral edge of the intake passage side of said cylinder head when said throttle valve is in said closed, idle position.
An internal combustion engine comprising a combustion chamber formed by a cylinder bore closed at one end by a cylinder head and by a piston reciprocating in said cylinder bore, at least one intake passage serving said combustion chamber through an intake port valved by an intake valve, a throttle valve in said intake passage upstream of said intake port moveable between an opened, full throttle position and a closed, idle position for controlling the flow through said intake passage into said combustion chamber, at least one exhaust passage serving said combustion chamber through an exhaust port, an exhaust valve for controlling the flow through said exhaust port, valve actuating means for operating said intake valve and said exhaust valve between their open and closed positions, said throttle valve being journaled on a throttle valve shaft journalled in said intake passage closely adjacent one side of said cylinder head, a throttle valve actuating shaft journalled for rotation about a throttle valve actuating shaft axis disposed parallel to the axis of said throttle valve shaft and at the side of said intake passage outwardly from said cylinder head, and motion transmitting means for transmitting rotation of said throttle valve actuating shaft into rotation of said throttle valve shaft.
An internal combustion engine comprising a combustion chamber formed by a cylinder bore closed at one end by a cylinder head and by a piston reciprocating in said cylinder bore, said piston driving an engine output shaft, at least one intake passage serving said combustion chamber through an intake port valved by an intake valve, a throttle valve in said intake passage upstream of said intake port moveable between an opened, full throttle position and a closed, idle position for controlling the flow through said intake passage into said combustion chamber, at least one exhaust passage serving said combustion chamber through an exhaust port, an exhaust valve for controlling the flow through said exhaust port, valve actuating means for operating said intake valve and said exhaust valve between their open and closed positions, said valve actuating means comprising at least one cam shaft journaled for rotation by said cylinder head, flexible transmitter means for driving said cam shaft from said engine output shaft, a throttle valve actuator for operating said throttle valve juxtaposed to said flexible transmitter, and a throttle valve position sensor for sensing the position of said throttle valve spaced from said flexible transmitter.
Dependencies are inferred from the claim text.