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This is a first part of 2 companion papers, which investigate the basic characteristics of gaseous LPG injection. For examining gas injection features only and more clearly, air is injected instead of real LPG to eliminate all real fuel effects such as vapor pressure variation due to temperature change. Two fuel injection systems for v-6 engine, one of which is remote rail system and the other is similar to gasoline MPI, were composed and one bank was operated under sequential injection scheme. Flow rates and pressure fluctuations in the rail were measured with varying fuel supplying pressure, interval of injection, injection duration, and fuel supply method. Results show that the flow rate has acceptable linear relationship with injection duration within 33 msec injection interval, however, the linearity is guaranteed over 33msec due to shortage of vaporizer supply. In addition, unbalance of flow rate is observed when 3 injectors work sequentially and the lowest-flow-rate injector is always same in spite of changing fuel supply method. Also the results show that the pressure fluctuation characteristics is not affected by independent fuel rail but by fuel supply system from vaporizer to fuel rail. Lastly, large rail volume improves the pressure fluctuation and flow rate unbalance.

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Abstract
1. 서론
2. 실험장치 및 방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-556-017190061