Zhang Qijun, Yin Jiawei, Fang Tiange, Guo Quanyou, Sun Jiaxing, Peng Jianfei, Zhong Chongzhi, Wu Lin, Mao Hongjun
Tianjin Key Laboratory of Urban Transport Emission Research & State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Tianjin Key Laboratory of Urban Transport Emission Research & State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
J Hazard Mater. 2024 Mar 5;465:133350. doi: 10.1016/j.jhazmat.2023.133350. Epub 2023 Dec 23.
Brake wear particles (BWPs) are considered one of the most significant non-exhaust particle emission sources from motor vehicles. Previous studies have primarily focused on BWPs from conventional fuel vehicles (CFVs), with limited research available on BWPs from new energy vehicles (NEVs). We developed an independent BWP emission testing system applicable to NEVs and conducted BWP emission tests on representative NEVs and CFVs under various testing cycles via a chassis dynamometer. The BWP emission characteristics of the NEVs equipped with regenerative braking system significantly differed from those of gasoline vehicles. For transient emission characteristics, gasoline vehicles exhibited higher peak concentrations during brake events than brake drag events, while those with regenerative braking exhibited the opposite feature. Under continuous braking, the concentration of ultrafine particles emitted by NEVs was reduced by more than 3 orders of magnitude compared to gasoline vehicles. In terms of single-particle morphology, BWPs could be mainly divided into three categories: carbonaceous particles, iron-rich particles, and mixed metal particles. We obtained realistic emission characteristics of BWPs from NEVs, which could provide data support and a scientific basis for the formulation of relevant emission standards and control measures in the future.
制动磨损颗粒（BWPs）被认为是机动车最重要的非尾气颗粒排放源之一。以往的研究主要集中在传统燃油汽车（CFVs）的制动磨损颗粒上，对新能源汽车（NEVs）制动磨损颗粒的研究较少。我们开发了一种适用于新能源汽车的独立制动磨损颗粒排放测试系统，并通过底盘测功机在各种测试循环下对代表性新能源汽车和传统燃油汽车进行了制动磨损颗粒排放测试。配备再生制动系统的新能源汽车的制动磨损颗粒排放特性与汽油车有显著差异。在瞬态排放特性方面，汽油车在制动事件期间的峰值浓度高于制动拖滞事件，而配备再生制动的车辆则表现出相反的特征。在持续制动下，新能源汽车排放的超细颗粒浓度与汽油车相比降低了3个多数量级。在单颗粒形态方面，制动磨损颗粒主要可分为三类：碳质颗粒、富铁颗粒和混合金属颗粒。我们获得了新能源汽车制动磨损颗粒的实际排放特性，可为未来制定相关排放标准和控制措施提供数据支持和科学依据。
