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Laser Ignition System

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ASME Internal Combustion Engine Division 2005 Fall Technical Conference: ARES-ARICE Symposium on Gas Fired Reciprocating Engines September 11 – 14 ,2005, Ottawa, Canada

ICEF2005-1352

Laser Ignition - a New Concept to Use and Increase the Potentials of Gas Engines
Dr. Günther Herdin/GEJenbacher GmbH & Co OHG Prof. Ernst Wintner/Technical University of Vienna DI Johann Klausner/GEJenbacher GmbH & Co OHG Josef Graf/Technical University of Vienna

DI Martin Weinrotter/Technical University of Vienna

Kurt Iskra/Technical University of Graz

ABSTRACT Due to market demands aimed at increasing the efficiency and the power density of gas engines, existing ignition systems are rapidly approaching their limits. To avoid this, gas engine manufacturers are seeking new technologies. From the viewpoint of gas engine R&D engineers, ignition of the fuel/air mixture by means of a laser has great potential. Especially the thermodynamic requirements of a high compression ratio and a high power density are fulfilled well by laser ignition. Results of measurements on the test bench confirm the high expectations – with a BMEP of 1.8 MPa it was possible to verify NOx values of a non-optimized system of 30 ppm (70 mg/Nm³ @ 5 % O2) with very high combustion stability. In the meantime, GEJ can look back at 6 years of excellent experience and can see itself as the “technological leader” in the field of laser ignition. Despite this, considerable developmental steps are still necessary to adapt the laser ignition concept fully to desired objectives (especially costs). INTRODUCTION Good degrees of efficiency of a gas engine require the highest possible BMEPs – this basic approach also results in a specific reduction of engine costs and, further, improved “life cycle costs”. On the other hand, the technological complexity and costs needed to achieve such requirements are considerable.

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