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建立了内燃机的通用数学模型,提出了内燃机的运行经济区.得出了改装后的LJ276M型内燃机的数学模型,并界定了此内燃机的运行经济区的边界范围,分析了此内燃机的运行优化曲线和最佳运行工况点.针对动力系统的冷热电、热电和供电3种操作模式,分别建立了能量转换数学模型,优化了动力装置的内燃机/变速箱传送比ies、电动机/变速箱传送比ims和电动机/内燃机传送比ime.结果表明:在冷热电模式下,ies和ims的优化值分别为2.9和1;在热电模式下,当动力系统需求负荷小于内燃机运行经济区的下限值时,ime取1,而当动力系统需求负荷超过内燃机运行经济区的下限值时,ime取0.85;在供电模式下,ims的最优值取2.5.
A general mathematical model of the internal combustion engine is established and the operating economic zone of the internal combustion engine is proposed.The mathematic model of the modified LJ276M internal combustion engine is obtained and the boundary of the operating economic zone of the internal combustion engine is defined and the operation optimization curve of the internal combustion engine And the best operating point.According to the three kinds of operation modes of thermoelectric, thermoelectricity and power supply of power system, the mathematical model of energy conversion was established respectively, which optimized the internal combustion engine / transmission transmission ratio of power plant, transmission of motor / gearbox The ratio ims and the motor / internal combustion engine transmission ratio ime. The results show that the optimization values of ies and ims are 2.9 and 1 respectively in the thermoelectric mode; when the required load of the power system is less than the lower limit of the operating economic zone of the internal combustion engine, Value, ime take 1, and when the demand for power system load exceeds the lower limit of the operating economic zone of the internal combustion engine, ime 0.85; in the power supply mode, ims optimal value of 2.5.