Abstract
The aim of this paper is to optimise the input parameters of a diesel engine which results in optimum performance and emission. Four input parameters viz., compression ratio, fuel injection timing, air temperature and air pressure were considered in this study. Four response variables i.e., brake thermal efficiency, brake specific fuel consumption, hydrocarbon emission and smoke opacity were measured. Twenty five experiments as per Taguchi L25 orthogonal array were performed and experimental data was analysed using grey relational analysis (GRA) to accomplish multi response optimisation. Regression analysis was done to determine the experimental value of the grey relational grade (GRG) at optimum setting of the input parameters. In order to validate the experimental results, the experimental value of the GRG was compared with the predicted value and the comparison revealed good relation between the predicted and experimental values of the GRG at optimum combination of the input parameters.
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