Особенности и характер влияния частоты вращения коленчатого вала на величину импульса реакций опор, оцениваемых при диагностировании двигателя внутреннего сгорания

Abstract

The development of universal diagnostic parameters with increased information content and the possibility of prompt registration and processing will help assess the current state of individual elements and the diagnostic object as a whole. As a universal diagnostic parameter characterizing the technical condition of the internal combustion engine, the authors propose to use the reaction impulse of the engine supports, the value of which depends on the crankshaft speed. Using a laboratory installation that includes a D-243 diesel four-stroke four-cylinder engine and a set of measuring equipment, the authors studied the process of changing the impulse of the reactions of the internal combustion engine supports when changing the crankshaft speed in the idling mode. When conducting research, they used methods of regression, system and statistical analysis. It has been established that in the crankshaft speed range of 600 to 2200 min-1, the maximum value of the bearing reactions for each cycle of engine operation changes from 345 to 122 N. In the range of 600 to 1000 min-1, the minimum value of the bearing reactions for each engine cycle changes -272 to -305 N and increases to -109 N at a maximum frequency of 2200 min-1. The maximum momentum of the support reactions is observed at a crankshaft speed of 1000 min-1 and averages for positive and negative reactions of the supports, respectively, 17.34 and -17.35 kNs. At the maximum speed of the crankshaft, the momentum of the support reactions reaches 9.28 and -9.29 kNs for the positive and negative reactions of the supports, respectively. The results obtained can be used to improve the methods for diagnosing internal combustion engines, as they can help exclude the infl uence of the crankshaft speed on the measurement result.