Patent ID: 7409933

Claim:
A two-cycle internal combustion engine comprising: one cylinder having a cylinder wall, one piston provided in said cylinder, said piston having an associated connecting rod for connection with a drive shaft and being movable in said cylinder between a bottom dead center position and a top dead center position so as to move through both a compression stroke and an expansion stroke, one head closing said cylinder on a combustion chamber side of said cylinder so as to form a combustion chamber in said cylinder between said head and said piston, said head having an internal surface, a crankcase closing said cylinder on a side of said cylinder opposite to said combustion chamber, a spark plug inserted in said head, a burnt gas exhaust pipe having an inlet port opening onto an internal surface of said cylinder adjacent the bottom dead center position of said piston, an air input duct that has no throttle valve and that has at least one combustion chamber air inlet scavenging port adjacent the bottom dead center position of said piston positioned so as to be opened and closed by movement of said piston, a lubrication oil inlet duct opening onto said air input duct, a sensor operable to sense rotation speed and angular position of the drive shaft, a fuel injector inserted in said cylinder wall, said fuel injector being inclined such that a fuel jet produced by said fuel injector is directed toward said interior surface of said head adjacent to said spark plug, penetrates into said combustion chamber and impacts said interior surface of said head adjacent to said spark plug, said fuel injector being positioned such that said top dead center position of said piston is between said fuel injector and said combustion chamber, and a control unit that synchronizes cyclic movement of said drive shaft with sparking timing of said spark plug and opening time of said fuel injector in dependence upon signals output from said sensor, and that regulates the quantity of fuel injected by said fuel injector for each engine cycle in dependence upon rotation speed, engine load and accelerator regulation set by a user, wherein the opening time of said fuel injector for each engine cycle is at the beginning of the compression stroke by said piston and after said piston has closed said at least one scavenging port.