Design strategy for improving the energy efficiency in series hydraulic-electric synergy system

Author(s): 
R. Ramakrishnan, Somashekhar S. Hiremath, M. Singaperumal (Indian Institute of Technology)

CHALLENGE - Current vehicle hybrid/electric systems present limitations due to poor regeneration energy savings. The Series Hydraulic/Electric Synergy System (SHESS) is potentially a valid option for improving the overall energy efficiency of HEVs. However, the highly complex nature of this mechatronic system requires considerable design effort to simultaneously maintain reliability, contain maintenance costs and effectively avoid energy loss.

SOLUTION - To achieve the objectives of maximizing regeneration energy and driving energy while minimizing the energy consumed, designers integrated the articulated SHESS model obtained with AMESim within the optimization workflow. By automatically varying pre-charge pressure, accumulator size and pump and traction motor displacement parameters, modeFRONTIER piloted the search for the best possible configuration.

BENEFITS - The system simulation with optimal parameters resulted in a 3% increase in energy efficiency and 17.3% improvement in hydraulic regeneration efficiency compared to baseline systems. modeFRONTIER enabled designers to handle a composite multi-objective and multidisciplinary problem effectively and identify a more scalable and efficient solution as opposed to currently used systems.