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A model-based control design approach for linear free-piston engines

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journal contribution
posted on 2023-06-09, 06:19 authored by Tom Nsabwa Kigezi, Julian DunneJulian Dunne
A general design approach is presented for model-based control of piston position in a free-piston engine (FPE). The proposed approach controls either ‘bottom-dead-centre’ (BDC) or ‘top-dead-centre’ (TDC) position. The key advantage of the approach is that it facilitates controller parameter selection, by way of deriving parameter combinations that yield both stable BDC and stable TDC. Driving the piston motion towards a target compression ratio is therefore achieved with sound engineering insight, consequently allowing repeatable engine cycles for steady power output. The adopted control design approach is based on linear control-oriented models derived from exploitation of energy conservation principles in a two-stroke engine cycle. Two controllers are developed: A Proportional Integral (PI) controller with an associated stability condition expressed in terms of controller parameters, and a Linear Quadratic Regulator (LQR) to demonstrate a framework for advanced control design where needed. A detailed analysis is undertaken on two FPE case studies differing only by rebound device type, reporting simulation results for both PI and LQR control. The applicability of the proposed methodology to other common FPE configurations is examined to demonstrate its generality.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Journal of Dynamic Systems, Measurement and Control

ISSN

0022-0434

Publisher

American Society of Mechanical Engineers

Issue

11

Volume

139

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Dynamics, Control and Vehicle Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-05-19

First Open Access (FOA) Date

2018-08-08

First Compliant Deposit (FCD) Date

2017-05-18

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