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Comparative field evaluation of vehicle cruise speed and acceleration level impacts on hot stabilized emissions

机译：车辆巡航速度和加速度水平对热稳定排放影响的比较现场评估

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The main objectives of this paper are two fold. First, the paper evaluates the impact of vehicle cruise speed and acceleration levels on vehicle fuel-consumption and emission rates using field data gathered under real-world driving conditions. Second, it validates the VT-Micro model for the modeling of real-world conditions. Specifically, an on-board emission-measurement device was used to collect emissions of oxides of nitrogen, hydrocarbons, carbon monoxide, and carbon dioxide using a light-duty test vehicle. The analysis demonstrates that vehicle fuel-consumption and emission rates per-unit distance are optimum in the range of 60-90 km/h, with considerable increase outside this optimum range. The study demonstrates that as the level of aggressiveness for acceleration maneuvers increases, the fuel-consumption and emission rates per maneuver decrease because the vehicle spends less time accelerating. However, when emissions are gathered over a sufficiently long fixed distance, fuel-consumption and mobile-source emission rates per-unit distance increase as the level of acceleration increases because of the history effects that accompany rich-mode engine operations. In addition, the paper demonstrates the validity of the VT-Micro framework for modeling steady-state vehicle fuel-consumption and emission behavior. Finally, the research demonstrates that the VT-Micro framework requires further refinement to capture non-steady-stale history behavior when the engine operates in rich mode.
机译：本文的主要目标有两个方面。首先，本文使用在现实驾驶条件下收集的现场数据评估了车辆巡航速度和加速度水平对车辆燃油消耗和排放率的影响。其次，它验证了VT-Micro模型是否可用于现实条件的建模。具体地，使用车载排放测量装置使用轻型测试车辆来收集氮，碳氢化合物，一氧化碳和二氧化碳的氧化物的排放。分析表明，每单位距离的车辆燃油消耗和排放率在60-90 km / h的范围内是最佳的，在此最佳范围之外有相当大的增加。研究表明，随着加速机动性的提高，每次机动的燃油消耗和排放率都会降低，因为车辆花费的加速时间更少。但是，如果在足够长的固定距离内收集排放物，则由于加速模式的增加，由于伴随浓模式发动机运行的历史效应，单位距离的燃料消耗和移动源排放率也会增加。此外，本文还证明了VT-Micro框架对稳态车辆燃油消耗和排放行为进行建模的有效性。最后，研究表明，VT-Micro框架需要进一步改进，以捕获当发动机在浓模式下运行时的非稳态历史行为。

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