Performance Evaluation of Energy Storage Systems for Different Drive Cycles in Hybrid Electric Vehicle

Abstract

The important control parameters for the hybrid electric vehicle are the lower and upper limit of state of charge (SOC). The vehicle’s onboard energy system defined the fuel economy and the electric range thus during the period at which the power demand is less, we will allow the ESS to get charged and they will get discharged during the period of high-power demand. ESS acts as the catalysts as they help in boosting the energy requirements. In HEVs, maintaining high energy density is a necessity while demanding higher peak power as well thus this results in doubling the incremental cost of the vehicle if approx. 15 % of all electric range is demanded. The SOC of the vehicle directly affects the economy and the emission rates. In this work the parallel HEV is modelled by using ADVISOR and Different SOC limits are taken for testing the performance and fuel economy for the same designed driving cycle. With the simulation results we will be able to specify best upper and lower limits of SOC such that vehicle will achieve best fuel economy and emission performance. The simulation is performed by taking repetitive velocity profiles (drive cycles) of four different curves i.e. UDDS, ECE, FTP and HWFET. The SOC and emission curves are observed for these different drive cycles and the results having emission rates for HC, CO and NOx (in g/miles) are tabulated.