A conceptual model of a diagnostic system for assessing the technical condition is proposed, on the basis of which it is possible to determine the ways of implementing a new approach in the design of integrated information measuring systems for monitoring the functional characteristics of the internal combustion engine (hereinafter referred to as ICE). With the help of established functional connections, it is possible to make a transition to the algorithmization of the diagnostic system under study for further development of the scientific and technological foundations of its application. Approbation of the proposed conceptual model was carried out by experimental studies of changes in the parameters of the free run-out of the YAMZ-53445-22 engine. As a result, it was found that the engine run-out time is on average 3,2 seconds, during which time the crankshaft rotation speed changes from 2 751 min-1 to 709 min-1. The engine crankshaft acceleration ranges from minus 138 s2 to 0 s2. The magnitude of the reactions of the supports during the run-out changes from 402 Н at a speed of rotation of the crankshaft 2 663 min-1 to 0 H at 709 min-1. The maximum value of the torque during the run-out is minus 234 Hm at a speed of rotation of the crankshaft 2 663 min-1. The power of mechanical losses calculated relative to the current value of the torque on the supports and the corresponding value of the crankshaft rotation frequency varies from minus 63 kW to zero with a similar change in the crankshaft rotation frequency. The developed conceptual model takes into account the totality of input effects on the system, the states of the system elements and the relationship of the system elements, which is confirmed by the experimental data obtained.

Kurnosov Anton F., Guskov Yuriy A. 

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