Abstract
The free piston engine generator (FPEG) is a novel power plant concept for series hybrid electric vehicles (HEV) that requires reliable control to regulate piston motion and guarantee safe operation during load transitions. This paper focuses on the control and constraint enforcement in a FPEG using a reference governor.A discrete, implicit, control oriented model describing the piston motion in a two-stroke two-cylinder FPEG at the turnaround point is derived based on energy balance and a feedback controller is designed to track the desired turnaround position by regulating fuel. An implicit reference governor is developed to guarantee safe piston motion by managing the load transitions. Thereference governor utilizes Newtons method applied to an implicitnonlinear model for response predictionand a bisection search algorithm to enforce the constraints for all the future time instants byadjusting the reference command. Additionally, the error in applying one iteration of Newtons method in predictingthe response of the implicit nonlinear system is estimated and accounted for in constraint tightening to guarantee that constraints are robustly enforced. The simulation results show that the feedback control scheme incorporating the developed implicit reference governor can effectively enforce the prescribed constraints during load transition.
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