Abstract
Marine combustion piston engines are more often equipped with common rail systems, which provide multi-part injection fuel delivery to the cylinder. Dose selection must take into account, among others, its duration, the engine speed and load torque. Practical use of a specific fuel dosing is usually preceded by a study on the test stand simulating the injection process and its dependence on the dose parameters. The authors have presented a method for the selection of these parameters in the case of one-and two-part injection in the medium speed marine engine. There has been presented the manner of creating a mathematical model of the fuel dosing during the injection and research of its characteristics in order to optimize the selection of the amount of fuel, that can be applied in the design of the CR system in the marine combustion engines.
Highlights
In the design of a Common Rail (CR) system used in marine piston combustion engines the important issue is the selection of the dosage that must take into account, inter alia, the duration of dosage, engine speed and torque
A single fuel dose in the Common Rail system corresponds to conventional fuel feed systems, the difference is in the manner of control of the fuel dose and the injection timing angle
Summarizing the above considerations related to the modeling of the fuel dosage for different fuel supply options in the Common Rail systems of a medium-speed marine engine we can conclude as follows: 1. The time required for the implementation of a given dose is different for single and two-part doses considered here, while in the second case it is more about the dwell time between the initial and the principal dosage
Summary
In the design of a Common Rail (CR) system used in marine piston combustion engines the important issue is the selection of the dosage that must take into account, inter alia, the duration of dosage (or the duration of the individual parts of the injection), engine speed and torque. In the paper [1], the authors proposed a method for the selection of these parameters for a medium speed marine engine with the injection system in which the fuel dose is divided into three parts. This method uses the theory of experiment planning, which allows obtaining a mathematical model of the fuel dosage during the injection. In this paper, this method was applied to select the single and two-part fuel dose. A single fuel dose in the Common Rail system corresponds to conventional fuel feed systems, the difference is in the manner of control of the fuel dose and the injection timing angle
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