It is shown that in systems with electronic control of the fuel supply process, the absence of a rigid algorithm for controlling the injection law makes it possible to change the nature of the flow of the working cycle during engine operation, depending on the task. If the task is to achieve maximum engine efficiency, the fuel supply law can be implemented with a gentle increase in injection pressure in the initial stage. If it is necessary to minimize the content of nitrogen oxides, the law of supply with twn-phase fuel injection is implemented. The transition from one mode to another is carried out by changing the control algorithm, which takes time within 0.25 s. Using the method of planning the experiment, as well as the results of experiments carried out in a ship, a mathematical model was obtained to assess the effect of load, lead angle of fuel injection and two-phase fuel injection of 7RT-Flex82T main diesel engines on the value of specific concentrations of nitrogen oxides in their exhaust gases. The adequacy of the proposed mathematical model to the results of the experiment was verified by the Fisher criterion. Given that the mathematical model adequately describes the results of the experiment by the Fisher criterion, it was concluded that it can be used to assess the effect on the specific emissions of nitric oxide in the exhaust gases of the load, the timing of the injection timing and the mass of pre-injection of fuel from the main engines of the 7RT- Flex82T. The obtained mathematical model allows us to solve the problem of optimizing the values of the lead angle of fuel injection and the mass of fuel pre-injection depending on the load of the diesel engine in order to reduce specific emissions of nitrogen oxides to the values normalized by rule 13 Nitrogen oxides of Annex VI of MARPOL 73/78.
Marine diesel engines, specific emissions of nitrogen oxides, load, lead angle of fuel injection, pre-injection masses, experimental design, mathematical model
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