In order to research fuel economy and emissions of ethanol-diesel blends, based on engine bench test and chassis dynamometer test, the fuel consumption and exhaust emissions of a 2-cylinder direct-injection diesel engine and a diesel passenger car in use were measured. The results indicated that without any modifications on the diesel engine,ethanol-diesel blends could proper improve fuel economy and reduce the emissions of smokes and NOx, but the emissions of HC increased. Besides, properly reducing the fuel supply advance angles was beneficial to improving fuel economy and reducing emissions. In the case of vehicle testing, which fueled with El0, the fuel consumption reduced at middle and high speeds, and also the emissions of PM and NOx reduced after the cold starting at normal temperature.Therefore, the research results can provide practical references for the improvement of fuel economy and characteristics of ethanol-diesel blends.%为了研究乙醇柴油混合燃料的经济性和排放性,该文在双缸直喷式柴油机和在用的柴油轿车上分别进行了发动机台架试验和整车底盘测功机试验.结果表明,在不调整柴油机条件下,使用乙醇柴油混合燃料能够在一定程度上改善发动机燃油经济性和降低排气烟度和NOx排放,但HC排放增加.适当减小供油提前角有利于改善乙醇柴油混合燃料发动机经济性和排放特性.对于试验车辆,燃用E10有利于降低汽车在中、高速时的等速工况燃料消耗量和常温下冷起动后PM、NOx排放量.该研究结果对于改善乙醇柴油混合燃料的燃油经济性和排放性具有实用价值.
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