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Rectangular current commutation and open-loop control for starting of a free-piston linear engine-generator

S.A., Zulkifli and M.N., Karsiti and A.R.A., Aziz (2008) Rectangular current commutation and open-loop control for starting of a free-piston linear engine-generator. In: 2008 IEEE 2nd International Power and Energy Conference, PECon 2008, 1 December 2008 through 3 December 2008, Johor Baharu.

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Abstract

Starting a free-piston linear engine-generator consists of reciprocating a freely moving piston-magnettranslator assembly between two oppositely placed engine cylinders to initiate combustion. To provide for the reciprocating force, the machine is operated as a brushless linear motor. A starting strategy is proposed which utilizes the air-spring quality of the engine cylinders prior to combustion: by energizing the coils with fixed DC voltage and by open-loop, rectangular commutation of injected current, sufficiently high motor force is produced to reciprocate the piston-magnet assembly in small amplitudes initially. Due to repeated compression-expansion of the engine cylinders and constant application of motoring force in the direction of natural bouncing motion, the translator's amplitude and compression pressure is expected to grow - due to mechanical resonance - to finally reach the required parameters for combustion. This work discusses the electrical aspects of the starting strategy, considers control possibilities, builds a model of the electrical subsystem and presents simulation and validation tests of the integrated model for starting investigation. © 2008 IEEE.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Automobile engines; Brushless DC motors; Combustion; Cylinders (shapes); Electric automobiles; Electric machinery; Engine cylinders; Engine pistons; Engines; Motion control; Motors; Permanent magnets; Secondary batteries; Smoke; Thermochemistry; Free-Piston Engine-Generator Starting; Linear Electric Generator; Permanent-Magnet Brushless Motor; Rectangular Commutation; Series-Hybrid Electric Vehicle; Electric generators
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:276
Deposited By: Mr. Saiful Azrin bin Mohd Zulkifli
Deposited On:02 Mar 2010 01:19
Last Modified:19 Jan 2017 08:26

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