DYNA JOURNAL ENGINEERING

Key words:

Degradación, motores de gas natural comprimido, oxidación, nitración, RUL - vida remanente del aceite, factor de estrés del aceite, Degradation, compressed natural gas engine, oxidation, nitration, RUL - remaining useful life number and oil stress factor.

Article type:

ARTICULO DE INVESTIGACION / RESEARCH ARTICLE

Section:

RESEARCH ARTICLES

ABSTRACT
In this study, a representative sample of urban buses, powered with CNG and diesel engine technologies and working on urban duty operation, have been studied in order to evaluate engine oil evolution of degradation. Main parameters evaluated have been related with oil degradation: oxidation, nitration, viscosity, Antioxidant additives depletion, antiwear, TAN, TBN and RUL Number. Results obtained have shown higher degradation rates for oils used on CNG engines than diesel engine. CNG engines studied showed a high thermal and mechanical stress, and lower oil sump volume. Experience with FT-IR technique on degradation study allowed to define optimal spectral ranges to quantify the changes of oxidation, nitration and fuel dilution problem in MCIA.