Lpg Engine Air-fuel Ratio Control And Flow Characteristics

The gaseous automotive engine was proved to be effective way to solve the problem of energy shortage and air pollution. The close loop is essential to engine, in order to make engine acquire optimum performance such as increasing power, falling resume of fuel etc. thus Air-Fuel-Ratio controlling is kernel of close-loop controller.Through studying closed -loop strategy of gasoline engine and analyzing characteristic of exhaust gas oxygen sensor, the paper gives the control strategies based on PI and Fuzzy. The experiment result manifest that both controllers operate well, Fuzzy controller is more precision and sensitive.The mathematical model for academic air and fuel gas flux based on experiments results is build up. MAP graphics of given fuel gas flux is put out, which is referenced by programming controlling software.