Fuzzy control method has been used to study engine idle speed. This method has advantage in not making mathematical model for the controlled object.

在控制策略上运用了模糊控制策略进行怠速控制，这种方法的优点是不需要为控制目标建立精确的数学模型。

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For studying characteristics of urban vehicular pollution so as to suggest the optimal control target for policy making, a mathematical optimizing model was developed.

为研究城市机动车污染特征，实现污染物排放的最优控制，提出研究排放控制目标的数学优化模型。

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The suitable simplified calculation formula for calculation at working site is presented on the basis of making mathematical transformation and analysis to the mathematics model.

在对数学模型进行数学变换和数学分析的基础上，得出了适用于作业现场计算的简化算式。

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