《B4_MichaelStapelbroek_Paper_English》.pdf

Title: “Hybrid Operation Strategy of a new Axle-Split Hybrid” Authors: Dr.-Ing. Michael Stapelbroek (FEV GmbH, Aachen, Germany) Dipl.-Ing. Hans-Peter Lahey (FEV GmbH, Aachen, Germany) Dipl.-Ing. Jürgen Ogrzewalla (FEV GmbH, Aachen, Germany) Contact: Michael.Stapelbroek@ Herta.Dumitru@ Subject Group: Propulsion/ Powertrain Key Words: Operation strategy, Optimization, Hybrid Electric Vehicle, Axle-Split-Hybrid, HEV, Discrete Dynamic Programming, DDP Abstract Hybrid electric vehicles offer the potential to minimize fuel consumption and emissions compared to conventional vehicles. Moreover Plug-In Hybrid electric vehicles offer the advantage of local emission free driving while overcoming the disadvantage of a short pure electric operating range and the need of a time-consuming battery charge procedure. All hybrid propulsion concepts use the additional degree of freedom – a second energy converter – to improve the powertrains efficiency in all operation points. Consequently, the operational strategy of those vehicles must be adapted to the corresponding concept to meet conflicting demands of fuel or energy consumption, engine emissions and acoustics as well as driving comfort in the most optimal way. In this area FEV uses a continuous development process to determine the concept layout of a hybrid powertrain and further for the design of hybrid operating strategies from concept to series production vehicle. With specific powertrain simulations and numerical optimization methods (De-sign of Experiments, DoE and discrete dynamic programming, DDP) the optimal hybrid power-train as well as the globally optimal operational strategy can be determined. This enables FEV to find an optimal solution within the range of available components, the customer vehicle targets and fuel consumption benefit. The results will be used as refere