Research on the Effect of the Parameters of Common-Rail System on the Injection Rate
Based on the Bosch long tube method, an injection rate measurement system is set up. Then several parameters, such as drive voltage, injection timing and injection pressure, are changed independently to study their effects on injection rate. The result sh
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Abstract Based on the Bosch long tube method, an injection rate measurement system is set up. Then several parameters, such as drive voltage, injection timing and injection pressure, are changed independently to study their effects on injection rate. The result shows that: injection pressure and parameters of electrical control signal, such as drive voltage and injection pulse width, have significant effect on injection rate. There are suitable injection pressure and parameters which could optimize injection rate. An empirical formulas about the injection quantity and several parameters are established finally.
Keywords Injection rate Bosch long tube method pulse width Injection pressure
Drive voltage Injection
1 Introduction To meet more and more stringent emissions regulations [1], common-rail system, which was invented in 1990s, is applied on diesel engine as one of the key technologies owing to its great advantages on emission reduction and fuel economy. Common-rail system provides high injection pressure to injector, which can optimize the fuel atomization, accurate fuel–air mixing and form more homogenous mixtures [2, 3]. Combining with electronic control technology, common-rail F2012-A02-016 G. Yu (&) L. Li J. Deng Z. Zhang L. Yu Tongji University, Shanghai, China e-mail: [email protected]
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 189, DOI: 10.1007/978-3-642-33841-0_30, Ó Springer-Verlag Berlin Heidelberg 2013
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system can provide accuracy control of the injection quantity, injection timing, injection rate [4], and multiple injection capabilities [5]. All of these help to improve combustion progress and reduce emission. Mulemane et al. [6] employed a Bosch type injection-rate meter to measured needle lift, injection-rate/rate shape and injection pressure and concluded that the measured injection-rate is a strong function of injection pressure and hole diameter of the nozzle. Carlucci et al. [7] studied the injection rate of injectors equipped with standard and geometrically modified control valves based on Bosch method and observed a certain difference in the slope of the first part of the injection rate and suggested several geometrical modifications for the injectors. Qiao et al. [8] employed Bosch long tube method to study injection rate of a diesel engine and observed that pressure wave signal collected continues for a certain time after injector turns off, which seriously affects measuring accuracy. Li et al. [9] compared the injection rate obtained by Bosch method and rotating Cells method. The results suggested that Bosch method is reliable and convenient. They explained that this method has the highest accuracy when four reflected waves observed in the pressure wave signal collected. Tian et al. [10] studied injection pulse width and rail pressure on injection quantity, concluded that injection pulse width mainly influences injection rate and rail pressure mainly infl
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