Correction strategy of fuel injection quantity during pilot-main injection for common rail system
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DOI 10.1007/s12206-020-0538-0
Journal of Mechanical Science and Technology 34 (6) 2020 Original Article DOI 10.1007/s12206-020-0538-0 Keywords: · Diesel engine · Common rail system · Pilot-main injection · Fuel injection quantity · Correction strategy
Correspondence to: Yun Bai [email protected]
Citation: Bai, Y., Gu, Y., Lan, Q., Fan, L., Ma, X. (2020). Correction strategy of fuel injection quantity during pilot-main injection for common rail system. Journal of Mechanical Science and Technology 34 (6) (2020) 2647~2656. http://doi.org/10.1007/s12206-020-0538-0
Received December 2nd, 2019 Revised
February 26th, 2020
Accepted March 15th, 2020
Correction strategy of fuel injection quantity during pilot-main injection for common rail system Yun Bai, Yuanqi Gu, Qi Lan, Liyun Fan and Xiuzhen Ma College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Abstract
Common rail system is a key technology of energy saving and emission reduction for modern diesel engines. Multiple injection, as one of the most interesting features of common rail system, allows both optimal fuel consumption and exhaust emissions. In order to explore the method for controlling the fluctuation of fuel injection quantity during multiple injection, experiments have been carried out in this paper, focusing on pilot-main injection. The high pressure fuel circuits of the system have been equivalent to a spring-mass vibration system. Comparison with the experiment shows that the proposed fluctuation equation can reasonably predict the fluctuation characteristics of main injection quantity with pilot-main injection interval. The correction control strategy for the main injection quantity fluctuation has been proposed, in which the relative damping coefficient, rail pressure, pilot-main injection interval and main injection pulse width are chosen as the input variables. The experimental results with different rail pressure and main injection quantity show that the fluctuation of injection quantity during pilotmain injection can be controlled effectively by the proposed correction strategy. The maximum average fluctuation of main injection quantity decreases by as much as 44.66 %.
† Recommended by Editor Yong Tae Kang
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
With the energy shortage and the more stringent emission regulations, improving economy and reducing pollutant emission of diesel engines have become increasingly urgent [1-3]. Energy saving and emission reduction is the main development direction for diesel engines [4, 5]. The fuel injection system directly affects the combustion products and the fuel consumption through fuel injection quantity characteristics [6]. Common rail system has become an objective requirement in modern diesel engines and a frontier technology of energy saving and emission reduction, due to its comprehensive optimization control of economy and emission through closed-loop control of pressure [7
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