Piston motion control of free piston engine based on iterative Reference Governor
GONG Xun
HU Yun-feng
YANG Rong-bin
CHEN Hong
Abstract：The reliable piston motion control of Free Piston Engine (FPE) is an enable technology to ensure its stable operation.This paper focuses on the study of piston motion control with constraints in FPE.Firstly,the piston motion control problem is described as the control of clearance height at the end of each stroke.Accordingly,a nonlinear implicit discrete-time,control-oriented model is developed.Then,a state feedback controller is proposed to ensure that the actual clearance height tracks the desired set-points.Regarding the motion fluctuation during load transition,a Reference Governor is proposed to manage the electric load to enforce constraints.Considering the nonlinear implicit characteristic of the system,a novel iterative Reference Governor based on Newton's method is proposed to deal with constraints in implicit system.Finally,the effectiveness of the proposed control system is tested by the co-simulation of MATLAB and AMESim which shows that good performance in piston position tracking is achieved and the constraints during load transitions is enforced.
Keywords：free piston enginepiston motion controlReference Governorconstraints
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 188-196 )