Intake air heating strategy to reduce cold-start emissions from diesel engines
Intake air heating strategy to reduce cold-start emissions from diesel engines
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DOI：
10.1080/17597269.2016.1271632
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
A. Ramadhas;Hongming Xu
中科院分区：
文献类型：
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作者：
A. Ramadhas;Hongming Xu
柴油机冷起动性能受环境温度条件、发动机设计、燃油、润滑油和发动机运行条件等因素的影响。本文研究了空气加热策略在降低最新一代涡轮增压直喷柴油机在极冷环境温度条件下的颗粒排放方面的潜力。新欧洲驾驶循环（NEDC）测试在−7 °C环境温度条件下针对不同的进气温度进行。在排放驾驶循环的冷启动阶段，进气加热使进气温度为5 ° C和15 °C时的碳氢化合物排放量分别减少了35%和55%，氮氧化物排放量分别减少了8%和10%。NEDC循环的冷启动阶段占总颗粒物的1/4，而进气加热的使用将其比例降低到1/5。在所有进气温度条件下，超过50%的颗粒直径小于23 nm，进气加热显著降低了颗粒数浓度。聚集态颗粒的表面积大于核态颗粒的表面积，颗粒总表面积随着进气加热的增加而减小。
ABSTRACT Diesel engine cold-start performance is influenced by the ambient temperature conditions, engine design, fuel, lubricant and engine operating conditions. This paper investigates the potential of air heating strategy in reducing the particulate emissions from the latest generation of turbocharged direct-injection diesel engines at very cold ambient temperature conditions. New European Driving Cycle (NEDC) tests were conducted at −7 °C ambient temperature conditions for the different intake air temperatures. Intake air heating reduced hydrocarbon emissions by 35 and 55% and nitrogen oxides emissions by 8 and 10% for intake air temperatures of 5 and 15 °C, respectively, during the cold-start phase of the emission driving cycle. The cold-start phase of the NEDC cycle accounted for 1/4 of the total particulates, and the use of intake air heating reduced its proportion to 1/5. More than 50% of the particulates are less than 23 nm in diameter for all the intake air temperature conditions, and the intake air heating reduced the particulate number concentration significantly. The surface area of accumulation mode particles was higher than that of the nucleation mode, and the total particle surface area decreased with the intake air heating.