METHOD TO INCREASE STABILITY OF OPERATION OF INTERNAL COMBUSTION ENGINE Russian patent published in 2006 - IPC F02B75/06 F02D35/00 

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention is designed for checking condition of internal combustion engine. According to proposed method, pressure of fuel combustion products onto piston is measured and changes of said pressure on piston depending on angle of turning of crankshaft journal and with due account of measured pressure values, reciprocating forces of moving masses of piston and engine crank gear in direction along axis of engine cylinder are determined with plotting of indicator diagram after which, for each half-turn of crankshaft, mean summary tangential force acting onto crank depending on crankshaft torque is determined. Basing on obtained results, summary value of tangential force on crankshaft crank for each half-turn of crankshaft is determined, as well as summary value of pressure of fuel mixture combustion products in cylinder and summary inertia forces of reciprocating masses of piston and crank gear for each cylinder is determined as difference between mean summary forces for mean summary tangential force and summary pressure forces of fuel mixture combustion products depending on angle of crankshaft turning are found after which flywheel is mounted on engine shaft and rotation of crankshaft with constant angular velocity is provided. Size of flywheel is chosen to provide summary crankshaft rotation resistance torque equal to summary torque caused by acceleration of crankshaft rotation under action of summary inertia force calculated as stated above. Counterweights are mounted on crankshaft. Centrifugal force on counterweight at its rotation with crankshaft is equal to unbalanced centrifugal forces if inertia of rotation masses at steady state operation of engine, and torque appearing on counterweight at rotation is equal to longitudinal torque of unbalanced forces of separate cylinders if summary resistance torque is equal to mean indicated summary torque of engine.

EFFECT: increased efficiency and service life of engine by increasing stability of operation of internal combustion engine.