Study on performance enhancement and emission reduction of used fuel-injected motorcycles using bi-fuel gasoline-LPG

The paper presents a simulation and experimental study on using bi-fuel gasoline - liquefied petroleum gas (LPG) for currently used fuel-injected motorcycles in Vietnam. Consequently, an innovative fuel supply system was designed to make the original gasoline motorcycles can flexibly operate on either gasoline or LPG. In this research, simulation processes were conducted by using a dedicated software analysis tool to optimize the operation process of the fuel system in order to maintain its stability and efficiency based on the characteristics of each type of fuels. Meanwhile, the original fuel supply system of the test motorcycle will be modified in the experiment by developing the second Electronic Control Unit (ECU) to control LPG quantity supplied for the one. The results showed that the test motorcycle well operated on either gasoline or LPG on the new design. In addition, when running on LPG the specific fuel consumption and exhaust emissions of the test motorcycle were reduced significantly. The investigation suggests that the old generation of fuel-injected motorcycles can be run flexibly on bi-fuel in order to reduce the fuel consumption and exhaust emissions.