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首页> 外文期刊>Energy Conversion & Management >Experimental study on the effects of exhaust heat recovery system (EHRS) on vehicle fuel economy and emissions under cold start new European driving cycle (NEDC)
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Experimental study on the effects of exhaust heat recovery system (EHRS) on vehicle fuel economy and emissions under cold start new European driving cycle (NEDC)

机译：冷启动新欧洲驾驶循环（NEDC）下排热回收系统（EHRS）对车辆燃油经济性和排放影响的实验研究

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Over the decades, unremitting efforts have been made to achieve energy conservation and emission reduction throughout the world. While for a vehicle engine, a great deal of the fuel energy is wasted as exhaust heat. Based on a novel exhaust heat recovery system devised and modified on a vehicle exhaust channel, the chief objective of this study is to improve the vehicle economy and emissions under cold start. Therefore, a detailed experimental investigation was conducted on the chassis dynamometer (CD) under cold start NEDC at 25 degrees C and -7 degrees C temperatures. And the method of comparative analyses of the coolant temperature, gasoline fuel consumption and exhaust emissions including total hydrocarbon (THC), carbon monoxide (CO) and nitrogen oxide (NOx) have been obtained to reveal the effects of EHRS on vehicle economy and emissions under cold start. The results show that, since the coolant temperature can be quickly increased with EHRS to shorten engine warm-up time under cold start, vehicle economy is enhanced during NEDC. Moreover, the device of EHRS can effectively alleviate the combustion deterioration and wall frame quenching effect in the cylinders under cold start, which greatly decreases THC emission. Although the excess air coefficient cannot be changed by EHRS, it can improve the combustion environment in cylinders, which contributes to the reduction of CO emission. It is unexpected to find that NOx emission is also decreased with EHRS actuation, which can be explained by a new theory called Fenimore mechanism. All these aims to provide helpful preliminary work for vehicles to meet the upcoming stringent limit of the real driving emission (RDE) of CHINA 6.
机译：几十年来，全球为实现节能减排做出了不懈的努力。而对于车辆发动机，大量的燃料能量被浪费为废热。基于在车辆排气通道上设计和改进的新型排气热回收系统，本研究的主要目的是改善冷启动时的车辆经济性和排放。因此，在底盘测功机（CD）上在25摄氏度和-7摄氏度温度下的冷启动NEDC上进行了详细的实验研究。并获得了冷却液温度，汽油燃料消耗和包括全烃（THC），一氧化碳（CO）和氮氧化物（NOx）在内的废气排放的比较分析方法，以揭示EHRS对车辆经济性和排放的影响。冷启动。结果表明，由于通过EHRS可以快速提高冷却液温度，从而缩短冷启动条件下的发动机预热时间，因此NEDC期间的车辆经济性得到了提高。而且，EHRS装置可有效减轻冷启动时气缸内的燃烧恶化和壁架淬火效果，从而大大降低了THC排放。尽管过剩空气系数无法通过EHRS进行更改，但它可以改善气缸中的燃烧环境，从而有助于减少CO排放。出乎意料的是，随着EHRS驱动，NOx排放也减少了，这可以用称为Fenimore机理的新理论来解释。所有这些旨在为车辆提供有益的前期工作，以满足即将到来的中国6的实际驾驶排放（RDE）的严格限制。

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