Machine Learning-Guided Optimization of Biofuel Blends for Enhanced Engine Efficiency and Emission Reduction
Abstract
India heavily relies on imported foreign crude oil, prompting the need for effective solutions to reduce this dependency. One such solution is the blending of Biodiesel, Palm oil, and Ethanol with original diesel. The crucial concern lies in determining the optimal blending ratio that maximizes Engine Efficiency while maintaining reasonable levels of Oil Consumption and NOx emission. To address this, experimental data are collected from the paper [1] which systematically blends biodiesel. Experimental data involved three input parameters [Load, Palm Biodiesel, Ethanol] and three output parameters [Motor Brake Thermal Efficiency (BTE), Brake Specific Fuel Consumption (BSFC), and Nitrogen Oxides (NOx)], with 40 different runs. The prediction was accomplished using 26 Machine Learning Models, including Gaussian Process Regression, Support Vector regression, ANN, Tree and Linear Regression and others. Among the 26 models considered in the analysis, three models emerged as the top performers. The Stepwise Linear Regression Model [SLRM] yielded the highest Brake Thermal Efficiency (BTE), the Fine Tree Regression Model [FTRM] achieved the lowest Brake Specific Energy Consumption [BSFC], and the Matern 5/2 Gaussian Process Regression Model [MGPRM] demonstrated the lowest Nitrogen Oxide (NOx) emission. These models displayed a range of Root Mean Square Error (RMSE) and R-squared(validation) values: 0.02077–0.02333 and 0.99 for SLRM, 0.03789–0.03907 and 0.98 for FTRM & 0.02184–0.02296 and 0.99 for MGPRM. Moving forward, a multi-objective optimization approach has been undertaken to simultaneously maximize BTE while minimizing both BSFC and NOx emissions. To accomplish this, a Multi Objective Genetic Algorithm [MOGA] is employed to identify the Pareto Optimal Solution. The optimization process [MOGA] resulted in a series of 18 Pareto Optimal Solutions. These solutions provide insights on the appropriate blend ratios of Load, Palm Biodiesel and Ethanol in order to maximize Engine Thermal Efficiency while minimizing Fuel Consumption and NOx emissions.
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