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Proceedings Paper

Ignition study of a petrol/CNG single cylinder engine
Author(s): N. Khan; Z. Saleem; A. A. Mirza
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Paper Abstract

Benefits of laser ignition over the electrical ignition system for Compressed Natural Gas (CNG) engines have fuelled automobile industry and led to an extensive research on basic characteristics to switch over to the emerging technologies. This study was undertaken to determine the electrical and physical characteristics of the electric spark ignition of single cylinder petrol/CNG engine to determine minimum ignition requirements and timeline of ignition events to use in subsequent laser ignition study. This communication briefly reviews the ongoing research activities and reports the results of this experimental study. The premixed petrol and CNG mixtures were tested for variation of current and voltage characteristics of the spark with speed of engine. The current magnitude of discharge circuit was found to vary linearly over a wide range of speed but the stroke to stroke fire time was found to vary nonlinearly. The DC voltage profiles were observed to fluctuate randomly during ignition process and staying constant in rest of the combustion cycle. Fire to fire peaks of current amplitudes fluctuated up to 10% of the peak values at constant speed but increased almost linearly with increase in speed. Technical barriers of laser ignition related to threshold minimum ignition energy, inter-pulse durations and firing sequence are discussed. Present findings provide a basic initiative and background information for designing suitable timeline algorithms for laser ignited leaner direct injected CNG engines.

Paper Details

Date Published: 16 November 2005
PDF: 10 pages
Proc. SPIE 5999, Intelligent Systems in Design and Manufacturing VI, 59990J (16 November 2005); doi: 10.1117/12.622525
Show Author Affiliations
N. Khan, Federal Urdu Univ. of Arts, Sciences and Technology (Pakistan)
Z. Saleem, Federal Urdu Univ. of Arts, Sciences and Technology (Pakistan)
A. A. Mirza, Federal Urdu Univ. of Arts, Sciences and Technology (Pakistan)

Published in SPIE Proceedings Vol. 5999:
Intelligent Systems in Design and Manufacturing VI
Bhaskaran Gopalakrishnan, Editor(s)

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