Analysis And Optimization On The Factors Influencing Marine Diesel Engine Output Torque

The performance study to Diesel Engine which is the most important equipment on ship, isalways one of the most important research contents in related fields.This paper takes the AnqingDaihatsu6PSTdM-26H diesel engine as study object, researches the affect on output torque withthe change of fuel injection timing, fuel delivery and combustion duration through establishingaccurate dynamical model of the crank link mechanism in the diesel engine and compute it out;Then obtain the best parameters of fuel injection timing, fuel delivery and combustion durationby optimum algorithm. The conclusion of the study has important instructive significance toimproving the efficiency of Diesel Engine and controlling of intelligent diesel engine.Firstly, establishes the model of the crank-link mechanism by analytical mechanics based onKane method, the accurate dynamical model of output torque is established. Secondly, Analyzesthe working progress in cylinder in detail according to the law of conservation of energy, law ofconservation of mass and ideal gas state equation, and calculate and simulate onMatlab/Simulink models for the progress. Finally, designs simulation software in thedevelopment environment of Visual C#2008. Changing fuel injection timing, fuel delivery andcombustion duration through the man-machine interface, output torque curve affected by variousparameters are obtained. On the basis, the best parameters of fuel injection timing, fuel deliveryetc. can be obtained through partial optimization.The results of calculation and simulation show that, the dynamical model established basedon Kane method is correct, and the simulation results are more close to the real value.