基于等效能量燃烧模式切换控制策略设计

During combustion mode transitions in diesel engines,there is often a problem of speed fluctuation.To address this issue,this research builds upon the PID speed closed-loop control strategy and establishes a modified model for the main fuel quantity during mode switching based on the equivalent energy principle.Additionally,a combined GT-Power and Simulink simulation model is constructed to design a combustion mode switching strategy using the equivalent energy model.The modified model recalculates the main fuel quantity and analyzes the impact of fuel quantity variation on speed fluctuation during combustion mode transitions.The results demonstrate that by incorporating the fuel quantity modification model,the speed fluctuation rate during the transition from single injection mode to multiple injection mode in the diesel engine decreases from 3.25%to within 0.5%,representing a relative reduction of 84.62%,with no significant fluctuation duration.Similarly,during the transition from multiple injection mode to single injection mode,the speed fluctuation rate decreases from 3.07%to 1.06%,resulting in a relative reduction of 65.47%.This effectively improves the smoothness of the engine during the switching process.