This study presents an analysis of real-world emissions from two heavy-duty trucks using the Not-To-Exceed (NTE) and the European based Work-Based-Window (WBW) methodologies. The study also presents a sensitivity analysis of the NTE and WBW approach to key parameters such as window duration, torque, power, and exhaust aftertreatment thresholds. The analysis is performed on data collected from two heavy-duty diesel vehicles operated under real-world conditions in California over various routes that include a combination of urban and freeway type operation. The results presented show that only 10–30% of the total data meets the required exclusion criteria prescribed by the current NTE regulation. Reducing the NTE window duration from the existing 30 to 10 s increases the number of windows available to perform NTE analysis. The study also shows that exempting data that correspond to exhaust aftertreatment system (EATS) temperature threshold of below 250 °C is the most dominant parameter influencing the number of available windows in an urban-type operation. The WBW approach produces a rich collection of data points that are representative of the in-use emissions characteristic of the vehicle. The results of NOx vs CO2 using a 4-quadrant analysis from the WBW approach is indicative of a difference in engine manufacturer design and emissions control strategy pertaining to real-world operation. The results of the study show that revisions to the boundaries and exclusions to the NTE zone would contribute to broadening the scope of in-use assessment of heavy-duty vehicle operation. However, even with such modifications, the NTE may not apply to highly transient urban vocations such as delivery, refuse and transit bus vocations. While comparing the moving average WBW approach to the NTE, the former approach produces a significantly larger number of data points for in-use assessment.

这项研究使用“不超标”（NTE）和基于欧洲的“基于工作窗口”（WBW）的方法，对两辆重型卡车的实际排放进行了分析。这项研究还对NTE和WBW方法对关键参数（例如车窗持续时间，扭矩，功率和排气后处理阈值）进行了敏感性分析。该分析是根据从加利福尼亚州在现实条件下通过两条路线（包括城市和高速公路类型的组合行驶）运行的两辆重型柴油车辆收集的数据执行的。给出的结果表明，总数据中只有10％到30％符合当前NTE法规规定的排除标准。将NTE窗口持续时间从现有的30 s减少到10 s，可增加用于执行NTE分析的窗口数量。研究还表明，与排气后处理系统（EATS）温度阈值低于250°C相对应的豁免数据是影响城市型操作中可用窗户数量的最主要参数。WBW方法产生了丰富的数据点集合，这些数据点代表了车辆的使用中排放特征。使用WBW方法的四象限分析得出的NOx与CO2的结果表明，发动机制造商的设计和与实际操作相关的排放控制策略存在差异。研究结果表明，对NTE区域的边界和排除范围的修订将有助于扩大重型车辆运行的使用评估范围。但是，即使进行了这样的修改，NTE可能不适用于高度瞬态的城市职业，例如送货，垃圾和公交车的职业。在将移动平均WBW方法与NTE进行比较时，前一种方法会产生大量的使用中评估数据点。