FIELD: mechanical engineering; two stroke multifuel internal combustion engines with crankcase displacement scavenging. SUBSTANCE: by exhaust system oxygen pickup signal control unit forms signals to change characteristics of piston movement irrespective of rotation of crankshaft which makes it possible to provide overlapping of bypass and outlet ports by piston in preset moment of cycle and thus reduce losses of fresh charge getting into exhaust system. Signals from control unit pass to drives displacement lever rocking axles along straight lines intersecting axes of cylinders. Levers are coupled with joints of articulated connecting rods which connect pistons with crankshaft. With displacement of lever rocking axle under action of drives, joints of articulated connecting rods are shifted to cylinder axes which leads to accelerated overlapping of bypass and outlet ports by piston in process of scavenging. EFFECT: increased economy, reduced toxicity of exhaust gases. 12 cl, 16 dwg
