Research on integration simulation and balance control of a novel load isolated pure electric driving system

Battery safety and driving range hinder the development of electric vehicles (EVs). This paper proposes a novel dynamic driving system-load isolated pure electric driving (LIPED) system. Keep working in its most economical point/area as energy source, a generator set is integrated and completely isolated from driving load. Two battery packs can be intelligently switched to ensure stable and sufficient power/energy supplying within their optimal discharge depths. A LIPED-EV prototype model on the basis of a light truck is developed by matching various components parameters of the power system, and the feasibility and superiority of the LIPED system are verified through performance simulations on power and economy performance. The comprehensive fuel consumption saves 17.4% compared with the prototype car. Besides, a collaborative driving control strategy is developed based on nine state of charge (SOC) combinations and five driving conditions. Additionally, to realize rapid SOC balancing of battery modules and adaptively recover braking energy, a discrete-input series-output battery grouping system is proposed via adopting a flip-up four-quadrant topology. The SOC convergence effects in various situations such as congenital inconsistency and voltage surge after module exits are also verified through multiple sets of experiments under the new European driving cycle.