Abstract
In this work, a simplified model of a rail-based fuel supply system in a compression ignition engine is presented. High pressure hoses were not taken into consideration and an empirical model was developed to simulate the injectors. The basic equations of the model are presented. Phenomena were described by 17 first-order ordinary differential equations. This work also contains an evaluation of the impact of the rail’s geometrical parameters on the injection process. The evaluation was carried out via a program calculating the injection process, using a balance model of the injection system. A method for making preliminary decisions on the geometrical parameters of the rail is proposed.
Highlights
The development of contemporary high-speed compression-ignition engines is linked to the development of their fuel supply systems
Common rail fuel injection systems dominate the supply of fuel to such engines
In the rail of a fuel supply system, the achievement of high pressure occurs in a piston-based high-pressure pump, from where a highpressure hose leads to the fuel rail, after which relatively short hoses lead to the injectors
Summary
The development of contemporary high-speed compression-ignition engines is linked to the development of their fuel supply systems. Work continues [11] on fourth-generation rail-based injection systems and on-line models adjusting the flow of fuel from the nozzle This has served as inspiration to elaborate a simplified model of the fuel supply system. Initial development is conducted via those packages and more precise efforts dedicated to a specific purpose are carried out using conventional programming languages These are one-dimensional models, describing the nonsteady, elastic flow of fuel in the system. The work presented here concerns a simplified system model, in which fuel from the three-piston high-pressure pump is fed to the inlet chamber and from there to the pressure vessel (rail) In these considerations, the high pressure hose, the injector hoses and the injectors were not considered. The injection (fuel flow) proceeds through four openings, directly from the pressure vessel (Fig. 1)
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