在已有柴油机数学模型的基础上 ,运用数学优化的方法 ,建立了以柴油机的油耗为目标函数和以柴油机的功率、最高压力升高率、最高爆发压力为约束条件的约束非线性优化模型 ;运用SUMT法和Powell方法求解该优化模型并用C语言编程实现了该模型的求解 ;从优化结果图可看出优化出的柴油机喷油参数的变化基本上符合柴油机的一般规律 . Based on the existing mathematical model of diesel engine, a mathematical model was established to optimize the nonlinear constrained optimization model, which takes the fuel consumption of diesel engine as objective function and the power of diesel engine, the rate of maximum pressure increase and the maximum explosion pressure as constraints. The optimization model was solved by SUMT method and Powell method, and the model was solved by using C programming language. From the optimization results, it can be seen that the optimized diesel injection parameters are basically in line with the general laws of diesel engine.