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本文提出广义一维非定常流动的模型,用以计算内燃机进、排气管中气体的流动。文中叙述了该模型的控制体基本方程,引入特征线的概念,导出了相应的特征方程和相容性方程,并给出了有限差分网络的数值解。 文中还给出了MPC增压系统的计算实例。计算结果为试验所证实。最后给出了排气有用能动态传递过程的计算结果。
In this paper, a generalized one-dimensional unsteady flow model is proposed to calculate the gas flow in the intake and exhaust of an internal combustion engine. The basic body of control model of this model is described in this paper, the concept of characteristic line is introduced, the corresponding eigenvalue and compatibility equation are derived, and the numerical solution of finite difference network is given. The article also gives a calculation example of MPC supercharging system. The calculation results are confirmed by experiments. Finally, the calculation results of dynamic transfer process of exhaust useful energy are given.