Cylinder fuel injection type two-cycle internal combustion engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsOsamu Sakamoto, Chitoshi Saito, Seiichi Nishimura
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Abstract
Embodiments of two-cycle crankcase compression direct injected internal combustion engines that permit good firing and effective stratification, particularly at low speed, low load conditions. The engine defines a combustion chamber having a recess with a projection extending into the center of the recess and against which fuel is injected by a fuel injector as the piston approaches top dead center at idle. The spark plug firing is initiated prior to completion of the fuel injection.
Claims36
A direct injected internal combustion engine having a pair of relatively movable components defining a variable volume combustion chamber, one of said components defining a recessed area with a projection extending generally centrally into and spaced from the periphery of said recessed area, said recessed area forming a substantial portion of the volume of said chamber when said components are in such a relative position that the chamber is at its minimum volume condition, fuel injection means mounted within the other of said components and disposed so that fuel issuing therefrom will impinge upon said projection as said components approach said minimum volume condition, a spark plug having its gap disposed contiguous to said recess when said components are in their minimum volume condition, means for initiating injection of fuel as said components approach said minimum volume condition under low speed, low load conditions, and means for firing said spark plug when said fuel injection means is injecting fuel.
A method of operating a direct injected internal combustion engine having a pair of relatively movable components defining a variable volume combustion chamber, one of said components defining a recessed area with a projection extending generally centrally into and spaced from the periphery of said recessed area, said recessed area forming a substantial portion of the volume of said chamber when said components are in such a relative position that the chamber is at its minimum volume condition, fuel injection means mounted within the other of said components and disposed so that fuel issuing therefrom will impinge upon said projection as said components approach said minimum volume condition, a spark plug having its gap disposed contiguous to said recess when said components are in their minimum volume condition, said method comprising the steps of initiating injection of fuel as said components approach said minimum volume condition under low speed, low load conditions, and firing said spark plug when said fuel injection means is injecting fuel.
Dependencies are inferred from the claim text.