Design of an instantaneous optimal energy management strategy for a dual-axis-parallel plug-in hybrid electric vehicleYan Zhengjun, Wang Weida, Li Hongcai, Han Lijin, Lv Yong, Zhang Sheng and Lin YiMATEC Web Conf., 139 (2017) 00034DOI: https://doi.org/10.1051/matecconf/201713900034