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Methodology to Estimate Road Grade Effects on Consumption and Emissions from a Light Commercial Vehicle Running on the WLTC Cycle

机译:估算WLTC循环运行的轻型商用车辆消费和排放的道路级效应的方法

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摘要

A novel methodology is suggested in this study, with the aim of assessing the impact of the road grade on a vehicle's performance and emissions. This methodology consists of creating multiple sinusoidal elevation profiles that simulate a vehicle trip between consecutive peaks and valleys with the total net elevation being zero. A light commercial vehicle is considered, powered by a turbocharged diesel engine, and the baseline trip is the worldwide harmonized light-duty vehicles test cycle (WLTC). A detailed engine-mapping approach is used as the basis for the results, with experimentally derived correction coefficients applied to account for engine transient operation. Engine-out NO and soot are the examined pollutants, as well as fuel, energy consumption, and CO2 emissions. Results from this study show that there is a noteworthy increase in emissions, even for a zero net elevation trip, with the magnitude of this increase being proportional to the trip root mean square (RMS) grade. For the engine/vehicle studied, higher RMS grade values (approximately 5%) result in a 3.5% increase in fueling/CO2 emissions, 5.6% increase in NO emissions, and 7.9% increase in soot emissions; on the other hand, lower RMS grade values (approximately 2%) have fueling/CO2 emissions remaining practically unchanged but still showcase a slight increase in NO and soot emissions (1.8% and 2.6%, respectively). (c) 2020 American Society of Civil Engineers.
机译:在本研究中提出了一种新颖的方法,目的是评估道路级对车辆性能和排放的影响。该方法包括创建多个正弦高度曲线,模拟连续峰和山谷之间的车辆行程,总净高度为零。考虑轻型商用车辆,由涡轮增压柴油发动机提供动力,基线之旅是全球统一的轻型车辆测试周期(WLTC)。使用详细的发动机映射方法作为结果的基础,采用实验导出的校正系数来应用于发动机瞬态操作。发动机输出NO和烟灰是检查的污染物,以及燃料,能耗和二氧化碳排放。这项研究结果表明,即使对于零净升高之行,排放量也有值得注意的增加,这一增加的程度与跳闸根均线(RMS)等级成比例。对于所研究的发动机/车辆,较高的RMS等级值(约5%)导致加油/二氧化碳排放量增加3.5%,无排放量增加5.6%,烟灰排放量增加7.9%;另一方面,较低的RMS等级值(约2%)具有燃料/二氧化碳排放仍然存在实际不变,但仍然展示NO和烟灰排放(分别为1.8%和2.6%)。 (c)2020年美国土木工程师协会。

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