METHOD OF DIAGNOSING PISTON PACKING OF INTERNAL COMBUSTION ENGINE AT INDICATOR DIAGRAM Russian patent published in 2016 - IPC G01M15/00 G01M15/08 

FIELD: engines.

SUBSTANCE: invention relates to testing of internal combustion engines (ice) and can be used for diagnosing piston ICE seals at their operation. Method of diagnosing piston packing of internal combustion engine at indicator diagram, consisting in the fact that variation of technical state of piston packing is determined by change of diagnostics parameter from its reference value that corresponds to a novel seal to limit value corresponding to defective seal, characterised by that the diagnostic parameter is the ratio of absolute pressure p_rssh/p_SLF, where p_rssh and p_SLF -pressure measured on the indicator diagram at given points of the process occurring in the above piston volume at switched off fuel feed to diagnosed cylinder, the pressure p_rssh expansion line is measured in a point at the specified angular distance from upper dead point of not less than five and not more than forty degrees turn of crankshaft, pressure p_SLF is measured on the line of compression in the point located at the same angular distance from upper dead point and the reference value of diagnostics parameter corresponding to a novel seal, the value equal to unity.

EFFECT: thus, use of the method simplifies diagnostics of piston seals.

2 cl, 2 dwg