不同掺混比例甲醇汽油车的排放特性

Emission Characteristics of Vehicles Fueled with Different Proportion Mixtures of Methanol-Gasoline Fuel

采用《轻型汽车污染物排放限值及测量方法》(GB 18352.3─2005)规定的Ⅰ型试验方法,对汽油车和不同掺混比例的甲醇燃料车在原催化器和新催化器条件下的瞬态常规污染物排放特性进行了研究.结果表明:甲醇燃料汽车CO和HC排放较汽油车低,其NOx的排放通常高于汽油车,且随甲醇比例的提高而增加,使用针对甲醇燃料开发的新催化器后,3种常规污染物排放均明显降低;甲醇燃料汽车CO的排放多数出现在第1个195工况,HC的瞬态排放规律与CO相近,NOx几乎在每个急加速阶段和城郊运行工况(EUDC)循环中均出现峰值.

This study examined the effects of different proportion mixtures of methanol and gasoline fuel on emissions of conventional pollutants from vehicles with original catalysts and vehicles retrofitted with new catalysts.Testing was carried out according to China＇s national standard GB 18352.3-2005,＂Limits and measurement methods for emissions from light-duty vehicles,＂ using the Type Ⅰ testing methodology regulation for gasoline and mixed-fuel gasoline-methanol vehicles.Research and analysis focused on transient emission characteristics results.The results showed that CO and HC emissions from methanol-fueled vehicles were lower than those from gasoline-fueled vehicles,while NOx emissions were generally higher and increased with increasing the proportion of methanol.When a new catalyst developed for methanol vehicles was used,as the proportion of methanol in the methanol-gasoline mixture increased,emissions of all three pollutants were significantly decreased.Emissions of CO from methanol-fueled vehicles mostly occurred during the first drive cycle 195.Transient emissions of HC closely followed those of CO.Emissions of NOx generally peaked during very fast acceleration phase and the EUDC cycle.