Investigation of methods for measuring fuel economy and emissions of heavy-duty hybrid-electric vehicles (HEVs)Jianfu Zhao, Dan Zhang, Dongzhi Gao, Junjiang Bao, Xiaojun Jing and Mingxuan LiE3S Web Conf., 360 (2022) 01002DOI: https://doi.org/10.1051/e3sconf/202236001002