DIAGNOSTICS METHOD OF INTERNAL COMBUSTION ENGINE TECHNICAL STATE Russian patent published in 2010 - IPC G01M15/04 

FIELD: measurement equipment.

SUBSTANCE: invention refers to diagnostics method of ICE technical state, namely of its cylinder piston group, and can be used for preliminary express diagnostics and preventive repair of engine. Method provides for measurement of compression in cylinder, determination of CO and CH content in exhaust gas, and in case of diesel engine - exhaust gas opacity. Then cylinder piston group is cleaned with addition-scale scavenger added to fuel and containing middle esters of orthophosphoric acid and dimethyl sulfoxide in the ratio (10-20):1. After cleaning is completed, repeated measurement of cylinder compression and CO and CH content in exhaust gas or their opacity is performed, obtained results are compared to nominal values for compression and to standard values for CH, CO content and opacity. As per obtained measurement results there assessed is technical state of cylinder piston group, namely wear of piston rings. Additional advantage of the method is removal of scale being one of possible reasons of off-normal engine operation which is performed together with diagnostics.

EFFECT: method provides improvement of accuracy of performed diagnostics, it is simple and available and it allows performing repair in time or replacement of worn parts of cylinder piston group.

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