Design And Appliction For The Switching Device Of Fuel Supply Advance Angle Based On Change Of Diesel Engine Loads

Due to high compression ratio,sufficient gas expansion,high heat quantityutilization rate,large power and long operating life of disel engine,it is widely usedin transportation, power generation, agricultural machinery and other fields. As aresult of increasingly stringent national emission regulations on the restrictions ofinternal combustion engine emissions,such as CO,HC,NOx and PM,how to furtherreduce harmful diesel emissions becomes an important research subject ininternational combustion engine field.With the goal of improving the engine start and reducing the emissions,thisarticle research for the A498BPG diesel engine proposes the switching device offuel supply advance angle based on change of diesel engine loads.It obtains therelationship between the fuel supply advance angle and the injection pump speedthrough mechanical analysis on double eccentric advance device.The articledesigns the switching device of fuel supply advance angle based on change ofdiesel engine loads by using three-dimensional modeling techniques ofUG.According to the requirements of different working conditions,the device canswitch fuel supply advance angle between-8°CA and-18°CA to meet therequirements of diesel engine cold start and normal work.Using three-dimensional numerical simulation software of AVL company,theresearch establishes A498BPG diesel engine cylinder working process model andtakes a numerical simulation of A498BPG diesel engine combustion process. Thesimulation results show that the soot emissions and particulate matter of the fuelsupply advance angle at-18°CA was significantly lower than the emission level of-8°CA,it is down about80%.The fuel supply advance angle locks-8°CA in normaloperating conditions,it reduces diesel NOx emission levels of about67%, muchlower than the level of NOx emissions of fuel supply advance angle at-18°CA.Finally,the research takes a verification test.The results show that theemissions of soot and particulate matter have markedly improved when the fuelsupply advance angle of the diesel engine during start-up locked at-18°CA.Undernormal operating conditions,fuel supply advance angle locked at-8°CA meets thelow NOx emission requirements.