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

Kigezi, Tom Nsabwa and Dunne, Julian (2017) A model-based control design approach for linear free-piston engines. Journal of Dynamic Systems, Measurement and Control. ISSN 0022-0434 (Accepted)

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Abstract

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.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ0170 Mechanics applied to machinery. Dynamics
T Technology > TJ Mechanical engineering and machinery > TJ0212 Control engineering systems. Automatic machinery (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2000 Dynamoelectric machinery and auxiliaries Including generators, motors, transformers
Depositing User: Julian Dunne
Date Deposited: 19 May 2017 07:34
Last Modified: 06 Jul 2017 16:52
URI: http://sro.sussex.ac.uk/id/eprint/68140

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