Optimization Of Ignition Advance Angle Of Hice Based On FIRE

With the rapid development of the automobile industry,in order to alleviate the energy crisis we must find new alternative energy sources.The automobile industry has great potential as well as responsibility.Hydrogen has attracted wide attention in the automotive industry for its wide source,renewable,pollution-free and wide use.Many studies have shown that the hydrogen fuel engine's power,economy and emission performance are greatly affected by the ignition advance angle.Whether the ignition time can be properly arranged is one of the important reasons to limit its power,economy and emission performance.Therefore,optimizing the ignition advance angle of hydrogen internal combustion engine is one of the keys to promote the development of hydrogen internal combustion engine.The 3D geometrical models were established by using the software of Pro-E,and the working cycle of the ICE under different engine speeds and loads is simulated based on AVL-Fire.The effects of different ignition advance angles on temperature and pressure during combustion of cylinder mixture were analyzed.And from the power,economy and emission angles,according to different conditions to backfire as constraint conditions,some performance indexes mainly take into account other properties,a multi-objective linear weighted objective function to optimize the ignition advance angle,in order to get the best ignition advance angle.Through simulation analysis,considering the power,economy and emission characteristics,the optimum ignition advance angle MAP diagram is obtained by multi objective weighted optimization without backfire.The results show that,in the range of ignition time,with the decrease of the percentage of load,the optimal ignition time will show the trend of advance.6000r/min advance from 18 ?A to 30?A;4500r/min advance from12 ?A to 24?A;3000r/min from 12 ?A to 18?A;1000r/min from 6?A to 12 ?A.When the load is constant,the optimal ignition advance angle increases with the increase of speed.At high load,the optimum ignition advance angle is delayed from 6?A to 18?A;the optimum ignition advance angle is delayed from 12 ?A to 24 o CA at moderate load;the optimum ignition advance angle is delayed from 12 ?A to 30 ?A at small load.