Research on parameter optimization of diesel engine intake system based on RSM method
The intake condition of diesel engines significantly influences the formation of the air-fuel mixture and combustion process.Optimizing intake parameters is crucial in addressing the"air-fuel ratio"issue in diesel engines, enhancing their performance, efficiency, and emission characteristics.This paper focuses on a high-pressure common rail diesel engine.Utilizing existing experimental data, a one-dimensional performance simulation model in GT-Power is built.At the maximum torque operating point,by varying intake pressure, intake temperature, intake valve opening angle, and exhaust valve closing angle individually, the effects of these variables on torque and brake specific fuel consumption are investigated.Employing the RSM (Response Surface Methodology), second-order regression models for torque and brake specific fuel consumption are established.Our study generates the weighted ranking of factors influencing torque and brake specific fuel consumption, performing a multi-objective optimization to balance maximum torque and minimum brake specific fuel consumption, yielding optimized calibration parameters.Our results indicate at intake pressure of 2.27 bar, intake temperature of 369 K, intake valve opening angle of 459°CA, and exhaust valve opening angle of 255°CA, the combination leads to a torque increase of 311.08 N · m, a 6.51％ improvement over the original engine.Furthermore, the brake specific fuel consumption decreases to 204 .11 g/( kW · h ) , down by 6 .25％.The maximum cylinder pressure is 154 bar, and the turbine inlet exhaust temperature is 883 K, meeting the specified limitations.Our study demonstrates the feasibility of using RSM for collaborative optimization of diesel engine intake system parameters, achieving the corresponding target requirements.
diesel engineRSMintake system parametersoptimization
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