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根据有关物理定律,推导得出汽油机混合比程序控制动态特性的数学模型,其形式为线性扰动微分方程组,运用拉氏变换求得动态和静态的负荷扰动对过量空气系数偏差的影响的传递函数及幅频、相频特性,从而得出不同负荷扰动频率下,混合比程序控制在静态和动态下,表现为减少燃油消耗率的控制效果的差值,并提出了通过选择供油量控制系统的刚度和阻尼系数,使控制效果静动态差值最小化的优化设计方法.最后示例了用数学模型仿真及优化方法的应用.
According to the relevant laws of physics, a mathematical model of the dynamic characteristics of gasoline engine mixture ratio control is deduced, and its form is the linear perturbation differential equations, and the Laplace transform is used to obtain the transfer function of dynamic and static load disturbances on the excess air coefficient deviation And the frequency and phase frequency characteristics of the system, the difference of the control effect of the hybrid ratio program under static and dynamic conditions under different load disturbance frequencies is obtained, and the control effect of reducing the fuel consumption rate is proposed. The stiffness and damping coefficient of the control effect to minimize the static and dynamic control of the optimal design method.Finally, an example of the use of mathematical model simulation and optimization methods.