FIELD: mechanical engineering.
SUBSTANCE: invention refers to the failure detection system and methods of failure detection for the internal combustion engines. Essence of the invention: When NOx-SCR catalyst is damaged, the denoxing (NOx) efficiency is increased with the rise of the catalyst temperature. Provided the deviation from the quantitative or qualitative representation of the urea-water-solution, distributed to NOx-SCR catalyst, the denoxing (NOx) efficiency is decreased at a stable rate. The situation, when the denoxing (NOx) efficiency is primarily positioned within the confines of the domain and subsequently transfers to domain, proves the NOx-SCR catalyst damage. The situation, when the denoxing (NOx) efficiency is primarily positioned within the domain and subsequently transfers to the confines of the domain, proves the deviation from the quantitative or qualitative representation of the urea-water-solution, distributed to NOx-SCR catalyst.
EFFECT: possibility of precise damage substantiation.
11 cl, 5 dwg
