Study On CNG Engine Lubricating Oil Composite Additive For City Bus

Process the study of CNG engine composite additive formulation for city bus. According to the conditions of city bus and its operating characteristics and the combustion characteristics of CNG motor fuel, analyse the lubricating requirements of CNG engine for city bus, require better antioxidant capacity, nitration resistance stability performance, anti—wear, have a good performance of anti—scratch, stronger acid cleaning,corrosion resistance and dispersion properties under high temperature. Afford to the requirements of CNG engine lubricating oil for city bus. Reference to gasoline engine lubricants industry standards, develop the assessment indicators of product. Take composite additive lubricating oil compare with single dosage lubricating oil, make the purpose and the meaning of researching composite additive explicit. Check the lubricating oil industry data, take a good comprehension of base oil and oil additives, and choose the appropriate samples to test.In lab take 15 W / 40 viscosity grade as the standard of the test sample, the composite additive is mainly used to blend 15 W / 40 engine lubricating oil for urban CNG bus. Derive standard viscosity base oil formulation to meet the grade requirements by experiments. Reference to the standard of gasoline engine oil, develop the base oil replacement criterion and the extension criterion of lubricating oil viscosity grade for composite additive lubricating oil. use base oil formula test the sensitivity of every single addictive and choose appropriate. Study the compatibility between the additives, understand the synergistic or invalid or inhibitive effect caused by the difference of p H and thermal stability between different addictives by testing. By orthogonal design experiment design and data processing research program was fully formulated compound additives. Study the composite technology and influencing factors of composite additives. Investigated by laboratory comparison test compound commercially available lubricant additives used in natural gas engine oil physical and chemical properties. The results showed that: its physical and chemical properties are better than commercial products.Composite additive formulation research process: sensitivity tests of single additive— the compatibility of the single additive trial — Orthogonal Recipe — Recipe initially Mixtures — laboratory simulations — Recipe adjustment —Formulation process adjustment research —the determination of the final formulation.