Determination of the moment of resistance forces of the internal combustion engine

The article discusses an experimental method for determining the moment of resistance forces of an internal combustion engine. The empirical method for determining the moment of resistance forces is based on the premise that when the engine is running without an external load (different idling modes), the work of gas forces is aimed at overcoming resistance forces and changing the kinetic energy of moving parts of the engine. If the moment of inertia of the rotating parts associated with the crankshaft is known, as well as the masses and kinematics of the parts performing reciprocating and plane-parallel motion, then knowing the instantaneous angular velocity of the crankshaft, it is possible to calculate the kinetic energy of the moving parts of the internal combustion engine at any time. The work of resistance forces at a certain angular interval is defined as the difference between the work of gas forces and the change in the kinetic energy of the moving parts of the engine at this angular interval. The angular velocity and position of the crankshaft are determined based on the signal processing of the standard crankshaft position sensor. By calculating the change in the kinetic energy of the moving parts of the internal combustion engine, it is possible to find the value of the external torques acting on them, one of which is the torque from gas forces, the determination of which, based on the signal processing of the standard crankshaft position sensor, is the ultimate goal of the work.

In the article, using the example of an in-line four-cylinder engine, an algorithm for determining the moment of ICE resistance forces is considered, the data obtained as a result of two-factor experiments are approximated by a polynomial of the third degree, and the effect of torque from gas forces on the value of the ICE resistance moment obtained by the proposed method is determined.

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