残余废气系数是指每循环进气过程结束时，缸内残余废气量与每循环实际进入缸内的新鲜充量之比（质量或体积比）。
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.
在废气残余系数和排气管氧化模型中采用经验公式。
The residual hydrocarbon and exhaust hydrocarbon oxidation models use experience formula.
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