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Lube Oil Chemistry Influences On Autoignition As Measured In An Ignition Quality Tester, Francis M. Haas, Sang Hee Won, Frederick L. Dryer, Cécile Pera
Lube Oil Chemistry Influences On Autoignition As Measured In An Ignition Quality Tester, Francis M. Haas, Sang Hee Won, Frederick L. Dryer, Cécile Pera
Francis (Mac) Haas
Derived Cetane Numbers (DCNs) of engine lubricating oil/ 95 Research Octane Number gasoline surrogate mixtures are measured in an Ignition Quality Tester. These measurements separately screen for effects of (1) calcium- and magnesium-based detergent additive, (2) oil degradation, and (3) base oil on mixture ignition propensity at conditions relevant to low speed pre-ignition (LSPI) in gasoline engines. Initial testing of ≤ 25% mass oil in the gasoline surrogate indicates a positive linear relationship between DCN and blend fraction, and also demonstrates the sensitivity of the measurement technique to mixture composition. Despite variation in Ca and Mg concentrations, DCN responses for …