Effects of Ambient Temperatures on Regulated and Unregulated Emissions from Methanol/Gasoline Engine During Cold Start

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Effects of Ambient Temperatures on Regulated and Unregulated Emissions from Methanol/Gasoline Engine During Cold Start

更新时间：2025-07-09

- Effects of Ambient Temperatures on Regulated and Unregulated Emissions from Methanol/Gasoline Engine During Cold Start
- Vol. 45, Issue 11, Pages: 6-10(2011)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK42
- Online First：10 November 2011，
  
  Published：2011
- 稿件说明：
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Effects of Ambient Temperatures on Regulated and Unregulated Emissions from Methanol/Gasoline Engine During Cold Start[J]. 2011, 45(11): 6-10.
DOI：

Effects of Ambient Temperatures on Regulated and Unregulated Emissions from Methanol/Gasoline Engine During Cold Start[J]. 2011, 45(11): 6-10. DOI：

摘要

在一台4缸进气道喷射汽油机上

研究了环境温度在从15 ℃下降到-25 ℃的过程中

4种甲醇汽油混合燃料低温冷起动的排放特性.结果表明:在试验环境温度下添加甲醇均能显著减少冷起动阶段HC和CO的排放.在冷起动过程中

HC的平均排放随着环境温度的降低而呈指数增加; 随着甲醇添加比的增大

HC排放的增加量逐渐减小

当甲醇的体积分数超过30%时

HC排放减少得并不明显.CO平均排放随环境温度的变化趋势与HC有所不同

当环境温度从5 ℃下降到-7 ℃时

CO排放增加了约10倍

随着温度的继续下降

CO排放变化不大.甲醛和甲醇非常规排放随着甲醇添加比的增大而增加

随着环境温度的降低而增加.

Abstract

A 4-cylinder port fuel injection(PFI)engine fueled with four methanol-gasoline blends was used to study the emission characteristics during the cold start process at different ambient temperatures(-25 ℃

-15 ℃

-7 ℃

5 ℃

and 15 ℃). The results show that the regulated emissions(HC

CO)were greatly reduced by methanol addition at all the test ambient temperatures. The average HC emission of the engine increased exponentially with the decrease in the ambient temperature

however

its change would gradually turn to be linear with the increase in the methanol fraction. When the methanol fraction in volume was over 30%

the reduction of HC emission would not be obvious. The variation of the average CO emission with the ambient temperature was different from that of the average HC emission. When the ambient temperature decreased from 5 ℃ to -7 ℃

the CO emiss

ion increased dramatically for the four fuels

however

the average CO emission did not change significantly with the further decrease in the temperature. In addition

the unregulated emissions(HCHO

OH)would increase with the decrease in ambient temperature and with the increase in the methanol fraction.

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Keywords

references

ABU-ZAID M, BADRAN O,YAMIN J. Effect of methanol addition on the performance of spark ignition engines [J]. Energy & Fuels, 2004, 18: 312-315.

魏衍举, 刘圣华, 刘方杰, 等.甲醇汽油发动机醇醛排放特性及其影响因素研究[J].西安交通大学学报,2011, 45(1): 59-63.

WEI Yanju, LIU Shenghua, LIU Fangjie, et al. Influencing factors and characteristics of methanol and formaldehyde emissions from a methanol/gasoline fueled SI engine [J]. Journal of Xi'an Jiaotong University, 2011, 45(1): 59-63.

WEI Yanju, LIU Shenghua, LIU Fangjie, et al. Formaldehyde and methanol emissions from a methanol/gasoline-fueled spark-ignition(SI)engine [J]. Energy Fuels, 2009, 23: 3313-3318.

WEI Yanju, LIU Shenghua, LIU Fangjie, et al. Aldehydes and methanol emission mechanisms and characteristics from a methanol gasoline-fueled spark-ignition(SI)engine [J]. Energy Fuels, 2009, 23: 6222-6230.

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BRUNO B A, SANTAVICCA D A, ZELLO H V. LIF characterization of intake valve fuel films during cold start in a PFI engine, SAE 2002-01-2751 [R]. Warrendale, USA: SAE, 2002.

SAMPSON M J, HEYWOOD J B. Analysis of fuel behavior in the spark-ignition engine start-up process, SAE 950678 [R]. Warrendale, USA: SAE, 1995.

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