State machine-based control strategy for a gasoline fueled PEMFC APU system

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State machine-based control strategy for a gasoline fueled PEMFC APU system

Pischinger, S. / Severin, C. / Adomeit, P. / Ogrzewalla, J. / Hülshorst, T.

Because of the increasing demand for electrical power in passenger vehicles, tight fuel consumption requirements and environmental sustainability, a fuel cell-based APU (Auxiliary Power Unit) becomes a promising alternative to conventional power generation (electrical energy produced via ICE and an alternator in combination with battery storage). A fuel cell based APU represents a rather complex technical system consisting of different subsystems, components and low-level controllers. Particularly in the case of gasoline-fueled systems, a sophisticated supervisory control is needed to manage the sequential control and to achieve fault tolerant and fail-safe operation. In this paper, a state machine-based APU control concept is presented, offering a transparent and modular structure. In addition to a superior control system (top level supervisor) that manages the overall strategies and the interaction of all subsystems, each subsystem is equipped with its own subsystem control (second level supervisor). This controller is responsible for all subsystem specific issues. The APU control concept was implemented using Matlab/Simulink and applied on a rapid prototyping controller unit. A subsystem level controller that is used on a reformer system is described in more detail along with the corresponding experimental results gained at the test bench are presented in this document.