Comparative Analysis of Power Characteristics for Volt PHEV Considering Drivetrain Losses

摘要

Power characteristics of Volt 1 and Volt 2 were investigated. Using the network analysis, the system efficiency and electrical power ratio were analyzed considering the drivetrain loss. To investigate the maximum fuel economy potential, a backward simulator was developed based on dynamic programming including the drivetrain loss and power electronics loss. Using the backward simulator, mode shift map was obtained. It was found that the mode shift map by dynamic programming agreed well with the existing map and operation of the power split modes was performed in accordance with the network analysis results. In addition, vehicle performance of Volt 1 and Volt 2 were compared. It was found that the improvement of the powertrain and engine efficiency of Volt 2 in the charge sustaining mode can be achieved by application of two power split (input and compound) modes and parallel(fixed ratio extended range) mode in spite of the increased drivetrain loss.