| The fuel injection system (FIS) is a very important part of a diesel engine, which affects the performance of power, economic and exhaust of an engine. It is must pay attention to the FIS when the new engine would to be designed, or an old one would to be redesigned.Now there are two types FIS to be used in the widely field. One is the system of Pump-Line-Orifice, which is used in the high power engines; the other is the Common-Rail FIS which is used in the low power engines. But automatically controlled technology of the Common-Rail is that the fuel injection system development trend in the 21st century , it bring new life to the long history internal-combustion engine , automatically controlled rail technology maturity at medium and small-scale diesel engine give us some experience about traditional fuel system , brought the new technological difficult at the same time . According used in large and middle scale diesel engine pump- high pressure Common-Rail -high-pressure line - Orifice set up test-bed, test and show the corresponding experimental result; Then according to the key structure dimensions of the design. The keys were analyzed by HYDSIM, the special software for FIS. The factors which influence the performance of the FIS were found, and the design was optimized.The thesis fingers out that the cam profile, the diameter of plunger, the effect shafting of plunger, the diameter of the high-pressure line, the lift of the needle and the total section area of the orifice are the keys for the performance of the FIS. In the systematic design of fuel Common-Rail of high pressure, Common-Rail is in charge of trying one's best to be great in the volume and fuel pressure, can improve the pressure of injection effectively , injection speed ; Because the amount of oil circulation injection is vast, should increase the internal diameter of the high-pressure oil line properly ; Limited to the existing test-bed condition , The last examination will be remaining in the future test. |
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