An optimization approach to hybrid electric vehicle preliminary design

This presentation evaluates the contribution of Analytical Target Cascading in hybrid electric vehicle preliminary design. The preliminary design problem was formulated as a two-level design problem: vehicle level and subsystem level. At the vehicle level, the main parameters of engine, driving motor, battery, and transmission were determined by solving a multi-objective constrained optimization problem. At the subsystem level, the gear parameters of the transmission and final drive were gotten to make the ratios of transmission and final drive as close to the target values cascaded from vehicle level as possible. The results show that the vehicle performance and subsystem level design can be optimized currently; the optimization method in preliminary design can offer design insights in an effective way.