Application And Research Of Methanol And Dissociated Methanol On The 4-Cylinder Gasoline Engine

Environment and energy crisis have been gaining concern worldwide, and both become the main drives for the development of ICE(internal combustion engine). The facts of lean-oil resource and high oil foreign dependence of C hina make it is imperative to develop alternative fuel for ICE. More and more rigorous emission standards, making the alternative fuel, which has emission reduction potential and cost advantage, a significant IC E development field in the future. For its non-complex production process, variety of sources and inexpensive price, Methanol(hereinafter referred to as M) is the promising and ideal alternative fuel for ICE.As a result, this paper carries out the research of using M, dissociated methanol(hereinafter referred to as DM) alone or b lend with gasoline on a 4-cylinder gasoline engine.Based on M's and DM's physical and chemical properties and their influence to gasoline engine's performance, the strategy of using M and DM is designed, and so as fuel supply solution.On the basis of the engine's parameters and research need, the simulation model of the engine is established on the platform of GT-POWER, which is verified by comparing the results of calculation and experiment of the engine's external characteristic. Further on, the analog computation of using M and DM on the engine is implemented.The results of using M on 4-cylinder gasoline engine show that the engine's power performance is improved markedly on all load models, as well as the economic performance when keep its power performance with the same as using gasoline. On the average, the emission on external characteristic of NOX, CO2 and HC are reduced respectively by 90%, 14% and 26%, CO is reduced at high speeds. The results of using DM on 4-cylinder gasoline engine show that the engine's power performance is declined by 18% on the external characteristic condition, while the economic performance is declined slightly. When the power performance is kept the same with using gasoline on the low and medium models, the economic performance is improved evidently, and the economic performance almost the same with using gasoline when it is on the high model. On the average, the emission on external characteristic of NOX and CO2 are increased markedly at high speeds, and are almost the same with using gasoline at other speeds; CO is decreased markedly at high speeds, and are almost the same with using gasoline at other speeds, and HC is decreased markedly at all speeds.