Computer Simulation Of High-pressure Common Rail Fuel Injection System

Today, increasing1y strict emissions regulation,violent market contest and energy shortageforce diesel to continually introduces into new technology to develop for the object of lowerpollution,lower fuel exhausion and high power per weigh. However, the key to improve diesel'spower, fuel efficiency and neduce emissions depends on improving diesel'scombustion.Combustion process and whole diesel feature depend on compatibility among the fuelinjection system,the intake system and structure of combustion chamber .The conventionalmechanism fuel injection system is not fit to phasic deveIopment increasingly. Among the fuelinjection systems which are being developed, high pressure common rail diesel fuel injectionsystem electronically controlled is the idealest injection system at present and prevalent injectionsystem in the 21-st century.This paper refers to foreign high pressure common rail dieseI fuel injection SystemeIectronically controlled, thinks aboot sbe for of high pressure common rail diesel fuelinjection system of Wuxi Weifu Corporation(GrouP), founds mathematic model of high pressurecommon rail diesel fuel injection system, further programs with Matlab5.1 Simulink Tools. Basicfeature of injection system is gotten with a parameter being changed independently and simulated.Knowing that each structure pameter which has influence on injection system, it provides thenecessary basis for future design and improvement so that it can save a lot of labors, materiaI,funds and time.In numerical simulation, changing common rail volume has Iess influence on controllingchamber pressare,injection pressure, needle valve lift, electromagnetism valve lift, windingcurrent and injection law. Along with common rail volume increasing, proportion of fuel deliveryto common raiI volume (volume variety rate) reduces. Common rail pressure decline reduceswith injection. Changing throttle hole area has not influence on winding current,electromagnetism valve lift. Along with throttle hole area decreasing, common rail pressuredecline slowers and controlling chamber pressure decline speeds~and phase of injection pressure,needle valve lift and injection law advanes when injection starts and their phase lags wheninjedon ends.Changing edle valve SPring mpion has nO influence on common nilpmesare, conboIling chaInber N windtw cwt and eleCbomagnedsm vaive liff andinfluence on injeCtion Prsny edIe valve lift nd injechon lawAlong with wipmeompression inchang pcompeinn fome incare and edle valve edinglop,thereforee injodinn lop,toOExperimented on the injection pe on the thel pUInP teStbed, ther ewiment meult iscomPared with simulallon result their whole Changjng bo are similar bu there is dislhaonbetween the fOrmer and the be It is considetal tha the pmp can ed simulating goal andrequesL...