NOX, CO, CO2 AND UHC EMISSION LEVELS OF GASOLINE ENGINE OF NISSAN MAXIMA: THE EFFECTS OF TURBOCHARGING

Analysing, comparing and curbing the pollution from the transportation sector has been considered for years by the governments; and is increasingly gaining more importance, because using this knowledge in designing stages will help preventing the emissions from entering the environment. The main objective of this work is to respond to the global concern for the rise of the emissions and the necessity of preventing them to form rather than dealing with their after-effects. Therefore, the roduction levels of four main emissions, namely NOx, CO2, CO and UHC in gasoline engine of Nissan Maxima 1994 is assessed via 1-D simulation with the GT-Power code. Then, a proper matching of turbine-compressor is carried out to propose a turbocharger for the engine, and the resultant emissions are compared to the naturally aspirated engine, after a 1-D simulation of the turbocharged engine is carried out, utilizing the same code. It is found that the emission levels of NOx, CO, CO2 are higher in terms of their concentration in the exhaust fume of the turbocharged engine, in comparison with those in the naturally aspirated engine. However, at the same time, the brake power produced by the turbocharged engine is significantly higher than that of the naturally aspirated engine and the brake specific emission levels are lower for the turbocharged engine. Therefore, it is concluded that the same performance is achievable much cleaner with the turbocharged engine. Also this provides the opportunity for downsizing the engine and further decreasing the emissions.

Keywords:

Emission , Gasoline SI Engine , Turbocharging , GT-Power , 1-D simulation