Toward On-Line Optimized Power Management for a Series Hybrid Hydraulic Powertrain

In this contribution, an instantaneously optimized power management algorithm using a two-level controller is introduced. The adaptive controller is applied for realization of power demand for the power management. Moreover, a model predictive controller-based power management is developed to be compared with the first one. Finally, both power management algorithms are compared to a globally optimized power management serves as benchmark reference. The power management algorithms are applied to a series hybrid hydraulic powertrain system. Control variables are high pressure in hydraulic line as well as motor/pump displacement ratio. Advantages with respect to the improvement of vehicle performance as well as vehicle efficiency can be observed. Comparing both strategies, it can be stated that the introduced new instantaneously optimized power management algorithm has better performance than the MPC-based power management, while efficiency of them is the same.