%0 Conference Paper
%A Zulkifli, S.A.
%A Karsit, M.N.
%A Aziz, A.R.A.
%D 2008
%F scholars:389
%K 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
%P 1086-1091
%R 10.1109/PECON.2008.4762637
%T Rectangular current commutation and open-loop control for starting of a free-piston linear engine-generator
%U https://khub.utp.edu.my/scholars/389/
%X 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.
%Z cited By 16; Conference of 2008 IEEE 2nd International Power and Energy Conference, PECon 2008 ; Conference Date: 1 December 2008 Through 3 December 2008; Conference Code:75682