Harmonic analysis and optimization of the intake system of a gasoline engine using GT-power

Abstract In order to improve the power and reduce the emission of a naturally aspirated gasoline engine at the same time, the effect of different intake structure parameters on the engine performance is investigated in details based on harmonic analysis and an optimization is carried out. First a full-scale gasoline engine model is set up using GT-power, which is calibrated by comparing the experimental data. Then the harmonic effect of the intake system is studied through spectrum analysis of pressure wave. The effects of different intake parameters on engine performance are investigated. At last the intake pipe is optimized using response surface model. The study shows that harmonic effect has big impact on the gasoline engine. The dynamic performance of the engine can be improved at all speeds by optimization the intake system parameters, and an increase of the maximum torque up to 7% is indicated.