US Patent 7574985 Two-stroke internal combustion engine

A two-stroke internal combustion engine with at least one cylinder (1), comprising a crankcase (2) flow-connected to the cylinder (1) by at least one transfer passage (3) and provided with an air intake manifold (4) and comprising an injection device for optional introduction of a fuel into the cylinder (1) or the crankcase (2) is described. To achieve fuel-air mixing adapted to the operating state of the engine it is proposed that the injection device comprises at least one injection nozzle (11) which is oriented toward the inlet region (12) of the transfer passage (3) issuing from the air intake manifold (4) and can be controlled as a function of the direction of movement of the piston (5) and the controller of the transfer passage (3).