残余废气系数 coefficient of residual gas ; Residual gas ratio
We simulate engine performance in various operating conditions:in idle condition, it reduces the residual gas coefficient and increases airflow velocity, so that idle stability is improved. Fuel consumption is dropped in partial load condition due to decreasing pumping loss.
模拟计算了各种工况下的发动机性能：怠速工况降低了残余废气系数,提高了进气流速,稳定性得到改善；部分负荷工况减小了吸气压力损失,提高了燃油经济性；全负荷工况增加进气流量,提高了动力性。
参考来源 - 全可变液压气门机构发动机进气性能及控制策略的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
缸内残余废气过多以及废气与新鲜空气的过度混合是小负荷时燃烧不稳定的一个主要原因。
The existence of overmuch residual exhaust gas together with its over mixing with fresh charge is one of the main causes of unstable combustion at low load.
模拟计算了各种工况下的发动机性能：怠速工况降低了残余废气系数，提高了进气流速，稳定性得到改善；
We simulate engine performance in various operating conditions:in idle condition, it reduces the residual gas coefficient and increases airflow velocity, so that idle stability is improved.
结果表明，通过调节排气门关闭正时，适当增大缸内残余废气量，可显著改善起动过程初始着火循环的着火燃烧性能和提高起动过程缸内燃烧的稳定性。
The results show that a proper increase of residual gas fraction could promote ignition and combustion stability of first firing cycle significantly during cold start.
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