2018-01-1018 Published 0 3 Apr 2018 © 2018 SAE International; FCA US LLC.Introduction According to the EPA (US Environmental Protection Agency), 17% of Model Year (MY) 2016 vehicle production already meets or exceeds the MY 2020 CO2 emissions targets [ 1]: this amount is much higher than projections for earlier model years [ 2]. Looking ahead, however, only about 3.5% of projected MY 2016 production could meet the MY 2025 CO2 emissions targets. Vehicles meeting the MY 2025 CO2 targets are comprised solely of hybrids, plug-in hybrids, electric vehicles, and hydrogen fuel cell vehicles. As evidence, the sales of these vehicles are expected to significantly grow in the next few years. In fact, worldwide plug-in hybrid vehicle sales for Quarter 1 (Q1) 2017 were 40% higher than for the same period in 2016 [3]. North America showed fastest growing region in Q1, with 50% growth. Hybrid Electric Vehicles (HEVs) provide a significant potential to reduce fuel consumption and, at the same time, satisfy customer acceptance constraints [ 4]. Since their capa - bility to combine the advantages of series and parallel configu - rations [ 5], power-split vehicles are the most successful and represent the largest portion of the current population of hybrid vehicles. The power-split powertrain is based on plan - etary gear sets (PG) which are very compact and can operate as a continuously variable transmission. Furthermore, the operation of this type of powertrain is efficient in many different vehicle categories, including Sport Utility Vehicles (SUV) [ 6, 7] and buses [8, 9 ]. Recently, power split transmissions have been improved with the addition of clutches in order to improve flexibility, operational efficiency and to increase the potential of the powertrain. More complex systems employ different operating modes, with each one of these best suiting a specific case of vehicle operation (i.e. launching, accelerating, cruising at high speed, regenerative braking…). By adding multimode opera - tion fuel consumption and drivability can be improved. The optimal design of power-split hybrid vehicles was first proposed by Liu et al. (2010), who established a systematic design approach for two planetary gear power-split two modes hybrid powertrains [ 10]. Based on this method, some studies have already been conducted to find the best designs using exhaustive search: Zhang et al. came up with a multimode HEV design based on the Toyota Prius where improvement in the fuel economy was achieved by including an extra clutch Abstract The production of multi-mode power-split hybrid vehicles has been implemented for some years now and it is expected to continually grow over the next decade. Control strategy still represents one of the most challenging aspects in the design of these vehicles. Finding an effective strategy to obtain the optimal solution with light computa - tional cost is not trivial. In previous publications, a Power-weighted Efficiency Analysis for Rapid Sizing (PEARS) algorithm was found to be a very promising solution. The issue with implementing a PEARS technique is that it generates an unrealistic mode-shifting schedule. In this paper, the prob - lematic points of PEARS algorithm are detected and analyzed, then a solution to minimize mode-shifting events is proposed. The improved PEARS algorithm is integrated in a design methodology that can generate and test several candidate powertrains in a short period of time.Mode-shifting Minimization in a Power Management Strategy for Rapid Component Sizing of Multimode Power Split Hybrid Vehicles Pier Giuseppe Anselma McMaster University/Politecnico di Torino Yi Huo McMaster UniversityEdris Amin FCA US LLCJoel Roeleveld and Ali Emadi McMaster UniversityGiovanni Belingardi Politecnico di Torino Citation: Anselma, P.G., Huo, Y., Amin, E., Roeleveld, J. et al., “Mode-shifting Minimization in a Power Management Strategy for Rapid Component Sizing of Multimode Power Split Hybrid Vehicl