柴油機(jī)高壓共軌電控燃油噴射系統(tǒng)數(shù)值模擬計(jì)算.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文柴油機(jī)高壓共軌電控燃油噴射系統(tǒng)數(shù)值模擬計(jì)算姓名：蔡珍輝申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：車輛工程指導(dǎo)教師：楊海青20080101柴油機(jī)高壓共軌電控燃油噴射系統(tǒng)數(shù)值模擬計(jì)算 iiABSTRACT With the future emission legislation challenging goals will be defined for Diesel engine manufactures. Lowest emis

2、sions with highest engine performance, low noise level, low fuel consumption and attractive costs are defining the targets of their development activities for future engine. A fuel injection system assists this developm

3、ent and becomes the decisive factor to reach targets. The electronic-controlled high-pressure common rail diesel injection system is more effective in emission reduction and engine performance improvement among all of th

4、e fuel injection system currently. This new system has the features of adjustable injection pressure, injection quantity and injection rate. This paper introduces the advantages of the high-pressure common rail fuel inj

5、ection system, the domestic and foreign researches; and the components of system and how they work in detail. With the simulating calculation and experiment, the detail analysis has been done on injection characteristic

6、and dynamic pressure characteristic inside rail. First, the numerical models of high-pressure pump, rail and injector is founded, using the calculating method of model unit, the simulating model is developed. By experime

7、nted on the optimum common rail system on the fuel pump test bench, the results of test are compared with simulation results; their whole changing trends are similar. It is considered that the model can reach simulating

8、goal and request. Then the influence of different parameters (start of injection, pulse duration of injection, construction parameter of injector etc.) on injection characteristic and dynamic pressure characteristic is g

9、otten with a parameter changed independently and simulated. Through the simulation, it provides the necessary basis for future design and improvement. Key words: simulation, electronic-controlled, high-pressure common ra