World Journal of Engineering Research and Technology

Arthur Felipe Rolim Dos Reis, Marcus Costa de Araújo, José Claudino De Lira Júnior, Jorge Henríquez, José Carlos Charamba Dutra*

ABSTRACT

The Brake Specific Fuel Consumption (BSFC) represents the efficiency of fuel and is related to the overall efficiency of an ICE. This study evaluates strategies for varying the events in the intake and exhaust valves to improve the BSFC of a gasoline engine. An optimization study was carried out to obtain the lift curves that allow the minimum fuel consumption for operating conditions at partial loads, which are representative of driving a vehicle in an urban cycle. A one-dimensional model of the Etorq Evo 1.6L turbo engine was taken as a basis and converted to an aspirated engine model. The Brent optimization method, which is available in the standard optimizer of the software and intended for optimizations with only one independent variable, was used in conjunction with the Univariate search method, thereby allowing more than one variable to be incorporated into the optimization process. Thereafter, an analysis was made of the phenomena that led to reducing the BSFC and also the implications for torque, volumetric efficiency and pollutant emissions. The results obtained a maximum reduction of 22.5% for the BSFC for a engine operating with 2 bar of Brake Mean Effective Pressure and at a speed of 1500 RPM.

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