Model Based Control Design for FPEs.pdf (629.06 kB)
A model-based control design approach for linear free-piston engines
journal contribution
posted on 2023-06-09, 06:19 authored by Tom Nsabwa Kigezi, Julian DunneJulian DunneA 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 ControlISSN
0022-0434Publisher
American Society of Mechanical EngineersExternal DOI
Issue
11Volume
139Department 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
2017-05-19First Open Access (FOA) Date
2018-08-08First Compliant Deposit (FCD) Date
2017-05-18Usage metrics
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