Conceptual Simulation for Plug-In HEV at Early Stage of Development
CHALLENGE - This study aims to build a practical conceptual simulation, which can design vehicle concept and define component specification at the early stage of PHEV development. Early stage development in the design of a Plug-in Hybrid Electrical Vehicle (PHEV) is fundamental to shorten the development phase and reducing design changes at later stages of the process. Fuel economy, vehicle acceleration and electric range are considered to judge the PHEV performances.
SOLUTION - The simulation methodology consists of boundary conditions and simulation model construction. The model based on forward-looking method comprises of plant-model and controller model which are made by one-dimensional simulation tool GT SUITE and MATLAB/SIMULINK, respectively. modeFRONTIER drives the optimization coupling the two software considering input variables, objectives and constraints. Six different drive modes have been considered: electric drive, series, battery recharging, engine drive, parallel, regeneration. Acceleration and fuel consumption simulations have been performed to find the optimum combination between engine and motor.
BENEFITS - The optimization using modeFRONTIER was conducted considering PHEV characteristics and engine control strategy on a compact series-parallel PHEV type passenger car. Results show that to meet the desired performances, the best combination is using a 70kW electric motor and a 1.2 liter engine. This enables to predict system layout and performances already at the early development stage.