The Study For Medium Pressure Common Rail Electronic Fuel System Of Low-speed Marine Diesel Engine

In recent years, the International Maritime Organization (IMO) ship graduallyimplemented stringent emission standards, which is the development of new marine dieselengine technology put forward higher requirements. Diesel common rail fuel injectiontechnology is recognized as the most significant innovations of the20th century dieseltechnology, appear in the high-pressure common rail technology with medium pressurecommon rail technology as the representative of the two major branches of technology, andthe use of advanced electronic control system. However, the current low-speed marinediesel engines for domestic research medium pressure common rail fuel injection system isalso small, which is detrimental to the overall development of our country in terms of newtechnologies for marine diesel engine. Therefore, this article focuses around the companyMAN B&W ME-C type medium-pressure common rail diesel systems in the study.This paper focuses on the following areas:1.Comparative analysis of the domestic and universal application of the RT-flex series andME-C Series two kinds of intelligent structural characteristics of each low-speed dieselengines, working principle and advantages. On this basis, the focus on ME-C series ofpressure common rail system carried out a detailed study, in which the fuel booster pump,exhaust valve drive, fuel injection exhaust control valve (FIVA valves), hydraulic powerunits and other parts the composition and working principle of a detailed analysis, thensummed up the work process fluid dynamics equations of the system, using the AustrianAVL Company Hydsim professional software to build models of the target pressurecommon rail fuel injection system simulation model. By means of simulation calculations,the structural parameters of some key parts of the influence of the fuel injection systemcharacteristics were studied and summarized, and the impact of changes in key controlsystem electrically controlled actuators for fuel injection valve-FIVA law conducted adetailed study.2.Based on modern control theory LQR linear quadratic optimal control theory, the paperexhaust control valve for the fuel injection has been deduced state space model, and usingMATLAB Control System Toolbox was calculated solving LQR controller, in this after theselected controller weighting matrix were discussed. Simulation results show that thesystem added LQR controller whose unit step response and impulse response have beengreatly improved to meet the work requirements of the system exhaust injector control. 3.Finally, the system is essential components of the accumulator selection, design andstrength check, the results show that the proposed design of the diaphragm accumulatorhousing to meet the strength requirements of work.