Simulating of air fuel ratio on the combustion and emission of gasohol engine based on GT-Power

A simulating test model is established and simulated by GT-Power software package. As a clean energy, the low productive cost and excellent emission characteristics have promoted it to wide use in market. In order to realize the best of gasohol emission performance, the bench test is conducted, in which comprising research on relationship between air-fuel ratio with gasohol engine load and effect of air-fuel ratio to engine emission performance under the test condition that engine is set a certain fixed speed. With the help of solvent, gasohol of different concentrations is made. The test shows the following facts: in the same condition of a certain engine speed, compared with common gasoline engine, power mixture of gasohol engine is small, and with the increase of the content of ethanol, it decreases. The corresponding power mixture of common gasoline is 13.6, and that of E5, E10 and E20 are 13.6, 13.4 and 12.7. At the same time, in the same condition of air-fuel ratio, compared with common gasoline engine, emission contents of CO, HC and NO_x from gasohol engine are lower, and with the ethanol content increases, the emission characteristics is better. Emission of CO decreases 3%-23%, and that of HC decreases 4%-12%. In contrast, the emission reduction of NO_x is not that significant, witch is about 2.6%-4.5%.