主办：陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊：1976年
汽车实用技术

汽车实用技术 ›› 2023, Vol. 48 ›› Issue (16): 75-79.DOI: 10.16638/j.cnki.1671-7988.2023.016.015

• 测试试验 • 上一篇    

重型柴油车燃用生物柴油 CO2和 NOx 排放 影响因素分析

柳鹏飞 1，王娃子*2，何凌兰 1   

  1. 1.中汽研汽车检验中心（广州）有限公司；2.温州职业技术学院 瑞安学院
  • 出版日期:2023-08-30 发布日期:2023-08-30
  • 通讯作者: 王娃子
  • 作者简介:柳鹏飞（1995－），男，研究方向为机动车污染，E-mail:1733756313@qq.com。

Study on Influencing Factors CO2 and NOx Emissions from Heavy-Duty Diesel Trucks with Biodiesel

LIU Pengfei1 , WANG Wazi*2, HE Linglan   

  1. 1.CATARC Automotive Test Center (Guangzhou) Company Limited；2.Rui'an College, Wenzhou Polytechnic.
  • Online:2023-08-30 Published:2023-08-30
  • Contact: WANG Wazi

PDF

摘要： 文章基于底盘测功机法以及中国货车行驶工况（CHTC-HT）测试了国六燃用生物柴油 车 CO2 和 NOx 的瞬态实际排放特征，评估了运行工况、冷热启动、环境温度和载荷下对实际 排放的影响。在瞬态运行工况下，测试车辆 CO2 的排放速率与加速度呈显著正相关，低速加 速段的 NOx 的排放速率急剧增加。环境温度和冷热启动影响样车 CO2 和 NOx 的排放，CO2 的排放主要受到车辆速度和负荷的影响，冷启动阶段、市区、城郊和高速的 CO2 平均排放速 率分别是 3.84 g/s、2.69 g/s、4.92 g/s 和 7.52 g/s。冷启动阶段的 NOx 排放占整个测试循环排 放的 62.9%，急加速阶段，多次出现排放 NOx 的峰值。载荷对 CO2 的比排放的影响并不十分 显著，与空载相比，半载的 NOx 的平均比排放降低了 27.1%。测试车辆在市区、城郊和高速 的工况下 CO2 的平均比排放差异并不显著。市区 NOx 的平均比排放达到 6 582.7 mg/(kW·h) （空载）、5 547.2 mg/(kW·h)（半载），分别是城郊的 1.55 倍、高速的 6.21 倍（空载），城郊 的 1.71 倍、高速的 9.94 倍（半载）。结果表明需重点关注低温冷启动时期，短时间内选择性 催化还原器（SCR）的工作效率的提升；同时，注重控制在低速加速阶段、长期荷载较低和 经常市区行驶的生物柴油车辆 NOx 的排放。

关键词: 重型柴油车；生物柴油；废气排放；影响因素

Abstract: This paper investigates transient emission characteristics of CO2 and NOx from diesel vehicles based on chassis dynamometer and China heavy-duty commercial vehicle test cycle for truck (CHTC-HT). The influence of operating modes, cold and hot start, ambient temperature and load on the real-word emission are estimated. Under transient operating conditions, the CO2 emission rate of the test vehicle is significantly positively correlated with the acceleration, and the NOx emission rate in the low-speed acceleration section increases sharply. The ambient temperature and cold and hot start affect the CO2 and NOx emissions of the sampling vehicle. The CO2 emissions are mainly determined by the vehicle speed and load. The average CO2 emission rates at the cold start, urban area, suburb and freeway are 3.84 g/s、2.69 g/s、4.92 g/s and 7.52 g/s, respectively. The NOx emission in the cold start accounts for 62.9% of the emission in the whole test cycle, and the peak value of NOx emission occurs repeatedly in the rapid acceleration process. The impact of load on the specific emission of CO2 is not very significant. Compared with no-load, the average specific emission of NOx at half load is reduced by 27.1%. The average specific emissions of CO2 of test vehicles under urban area, suburb and freeway modes are not significantly different. The average specific emission of urban area NOx is 6 582.7 mg/(kW·h) (No-load) and 5 547.2 mg/(kW·h) (Half-load), which are 1.55 times of suburb, 6.21 times of freeway (No-load), 1.71 times of suburb and 9.94 times of freeway (Half-load), respectively. The results show that it is necessary to focus on the improvement of selective catalytic reduction (SCR) efficiency in a short-term during the cold start period at low temperature; Meanwhile, should pay attention to controlling the NOx emission of biodiesel vehicles under low-speed acceleration, long-term lower load and regular urban driving.

Key words: Heavy-duty diesel trucks; Biodiesel; Exhaust emission; Influence factors