Development of a Computer Model to Simulate the Injection Process of a Diesel Engine

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• 作者：Jose M. Palomar ; Fernando Cruz ; Antonio Ortega ; Francisco J. Jimenez-Espadafor ; Gregorio Martí ; nez ; and M. Pilar Dorado
• 刊名：Energy & Fuels
• 出版年：2005
• 出版时间：July 2005
• 年：2005
• 卷：19
• 期：4
• 页码：1526 - 1535
• 全文大小：354K
• 年卷期：v.19,no.4(July 2005)
• ISSN：1520-5029

文摘

The diesel engine injection system is greatly responsible for the emission of pollutants to theatmosphere, noise generation, and engine performance. Proper synchronization of the exactamount of fuel that can be burnt according to each crankshaft position is essential to achievemaximum power, consumption economy, and combustion without residues. In this sense, whendesigning an injection system, all of these factors must be taken into account. During theoptimization, however, the improvement of some of them may result in detriment to others. Forthis reason, to achieve the system optimization, the relationship between the aforementionedvariables and the parameters that characterize the injection must be established. According tothis, it is important to design a strategy that allows the named "reverse modeling of the injectionsystem", that is to say, to determine the injection system dimensions according to the systemrequirements. In the present work, an iterative computer model based on the continuity andenergy equations, solved by finite differences algorithms, has been proposed. This model hasbeen designed for a Bosch rotary pump and makes it possible to plot the performance of thepressure lines in the different combustion chambers, the valve lift curves, and the fuel flow injectedper cylinder and cycle. In this sense, we can conclude that the proposed computer model predictsaccurately the opening and closing processes in the injector needle, as well as the pressure curvesin the last division of the high-pressure tube.