Comparison of On-Board Charging Strategies for Range-Extender Hybrid Vehicles with Lead-Acid Batteries

Hybrid Electric vehicles are becoming popular because of the improvement in fuel economy and strict emission norms. Range-extender hybrid vehicles are interesting as they provide best fuel economy in city drive cycle. The fuel economy of hybrid vehicle is depended on electric range, control strategy, electric-recharge and drive cycle. In this paper two control strategies for battery state of charge (SOC) control are evaluated for optimizing fuel economy and depth of discharge (DOD) of battery for range-extender vehicle. Advisor model with lead-acid battery is used to evaluate and compare fuel economy and DOD of battery in city drive cycle. The results are presented and it can be seen that PI controller method gives a better control over battery SOC and reduces transient in engine power as compared to the Additional power method.