加载参数对柴油机恒转速增转矩瞬态工况的试验

发布时间：2018-01-29 00:51

本文关键词： 增压柴油机瞬态工况平均增量空燃比加载　出处：《内燃机学报》2016年01期 　论文类型：期刊论文

【摘要】：以一台高压共轨、增压中冷的重型柴油机为研究对象,研究了不同加载率、加载起始点以及加载持续时间对恒转速增转矩加载过程的影响.定义了"平均增量空燃比"和"空燃比平均减速度"两个参数,分别用于评价加载过程中供气相对于供油的响应速率和空燃比的降低速率.研究发现:加载率越大或者加载起始点负荷越小,供气滞后越严重,燃油消耗率、烟度以及CO排放增加,但NOx排放降低.燃油消耗率和烟度排放的主要恶化区分别集中在加载过程的前期和后期;随着加载持续时间增大,供气响应性能虽有改善,但空燃比较稳态值仍明显降低,燃油消耗率、烟度和CO排放性能恶化.另外,加载持续时间对瞬态烟度和CO峰值排放存在拐点.
[Abstract]:A heavy duty diesel engine with high pressure common rail and supercharged and intercooled was used as the research object, and different loading rates were studied. The effect of loading starting point and loading duration on the loading process of constant rotational speed increasing torque is studied. Two parameters, "average incremental air-fuel ratio" and "average deceleration rate of air-fuel ratio", are defined. It is used to evaluate the response rate of gas supply to fuel supply and the decreasing rate of air-fuel ratio respectively. It is found that the higher the loading rate or the smaller the load at the starting point of loading, the more serious the gas supply lag and the fuel consumption rate. Smoke and CO emissions increased, but NOx emissions decreased. The main deterioration areas of fuel consumption rate and smoke emission were concentrated in the early and late stages of loading process, respectively. With the increase of loading time, the response performance of air supply is improved, but the steady state value of air-fuel ratio is obviously decreased, the fuel consumption rate, smoke and CO emission performance deteriorate. The loading duration has an inflection point on transient smoke and CO peak emission.
【作者单位】：吉林大学汽车仿真与控制国家重点实验室;长安汽车工程研究院;
【基金】：国家重大基础研究发展规划(973)资助项目(2013CB228402) 国家自然科学基金资助项目(51206060) 吉林大学研究生创新基金资助项目(2014015)
【分类号】：TK427
【正文快照】： 车用内燃机大部分时间运行在瞬态工况,瞬态工况包括:转矩和转速都随时间变化的工况、定转速变转矩工况、定转矩变转速工况、起动工况和停车工况等工况模式.随着欧Ⅲ等排放法规对发动机瞬态测试循环的强制要求以及公众对实际燃油经济性的关注,柴油机的瞬变性能成为了广大内燃机

【相似文献】