Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92507, United States; Bourns College of Engineering - Center for Environmental Research and Technology (CE-CERT), University of California, Riverside, CA 92507, United States.
Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92507, United States; Bourns College of Engineering - Center for Environmental Research and Technology (CE-CERT), University of California, Riverside, CA 92507, United States.
Sci Total Environ. 2018 Apr 1;619-620:765-771. doi: 10.1016/j.scitotenv.2017.11.120. Epub 2017 Nov 29.
The regulated emissions of five 2012 and newer, low-mileage, heavy-duty Class 8 diesel trucks equipped with diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems were evaluated over test cycles representing urban, highway, and stop-and-go driving on a chassis dynamometer. NOx emissions over the Urban Dynamometer Driving Schedule (UDDS) ranged from 0.495 to 1.363g/mi (0.136 to 0.387g/bhp-hr) for four of the normal emitting trucks. For those trucks, NOx emissions were lowest over the cruise (0.068 to 0.471g/mi) and high-speed cruise (0.067 to 0.249g/mi) cycles, and highest for the creep cycle (2.131 to 9.468g/mi). A fifth truck showed an anomaly in that it had never regenerated throughout its relatively short operating lifetime due to its unusual, unladed service history. This truck exhibited NOx emissions of 3.519g/mi initially over the UDDS, with UDDS NOx emissions decreasing to 0.39g/mi after a series of parked regenerations. PM, THC, and CO emissions were found to be very low for most of the testing conditions, due to the presence of the DPF/SCR aftertreatment system, and were comparable to background levels in some cases.
对 2012 年及以后生产的五辆装有柴油颗粒过滤器（DPF）和选择性催化还原（SCR）系统、行驶里程较短的重型 8 级柴油卡车的受控排放进行了评估，这些卡车在底盘测功机上进行了代表城市、高速公路和停停走走驾驶的测试循环。对于四辆正常排放的卡车，在城市动态驾驶循环（UDDS）中，NOx 的排放量在 0.495 到 1.363g/mi 之间（0.136 到 0.387g/bhp-hr）。对于这些卡车，NOx 排放量在巡航（0.068 到 0.471g/mi）和高速巡航（0.067 到 0.249g/mi）循环中最低，在爬行循环（2.131 到 9.468g/mi）中最高。第五辆卡车出现了异常情况，由于其不寻常的空载服务历史，在其相对较短的运行寿命内从未进行过再生。这辆卡车在 UDDS 上的初始 NOx 排放量为 3.519g/mi，在进行了一系列停车再生后，UDDS 的 NOx 排放量降至 0.39g/mi。由于存在 DPF/SCR 后处理系统，在大多数测试条件下，PM、THC 和 CO 的排放量都非常低，在某些情况下与背景水平相当。
