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In use 25ton trailers with Hyundai electronically controlled D6CB was converted to dual fuel system. To estimate economical efficiency, test vehicles have been operated on a certain driving route repeatedly. Test gross weight is about 30ton and both MPI and SPI natural gas injection systems are evaluated. Fuel economy, driving distance per refueling and driveability are examined in the field test including free way. Developed vehicle can be operated over 500km with dual fuel and shows 85% of diesel substitution ratio. Driveability is similar with but passing acceleration. It will be improved by calibration process. Test engine was set up for investigating power output, thermal efficiency and emission. ND 13-mode tests were performed for the test cycle. The emission result of dual fuel meets K2006 regulation the diesel equivalent engine performance output condition. Thermal efficiency is slightly low at full load condition and even worse at low load as compared to diesel operation.

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Abstract
1. INTRODUCTION
2. Characteristics of Dual Fuel System
3. Experiment and Performance
4. CONCLUSION
ACKNOWLEDGEMENTS
References

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UCI(KEPA) : I410-ECN-0101-2009-556-016822286