在恒转速减扭矩的变工况过程中，随着扭矩变化率的增大微粒排放量逐渐减小。
For operating conditions with uniformly drop of torque, particulate emissions decrease gradually with increase of torque drop rate.
研究结果表明：扭矩波动、转速波动、HC排放值和HC升高率都受空燃比的影响，并且它们的变化趋势具有较好的一致性；
Test results show that fluctuation of torque output and engine speed, HC emission and its rise ratio are all affected by excess air ratio.
负荷相同时，转速波动率的大小与转速没有单调变化关系。
However, when the load is same, the fluctuation ratio is independent to the mean engine speed.
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