표제지
목차
요약 4
Nomenclature 9
I. 서론 10
II. 관련 이론 13
1. 천연가스 연료의 물리 화학적 특성 13
2. 자동차 연료로서의 특성 14
3. 가스 분사 시스템 15
III. 실험 장치 및 실험방법 16
1. 실험 장치 16
2. 실험 방법 21
IV. 결과 및 고찰 22
1. 운전 조건에 따른 분사특성 22
1) 설정압력에 따른 분사유량 22
2) 분사펄스폭에 따른 분사유량 30
3) 운전속도에 따른 분사유량(동일 레일 체적) 36
4) 레일체적에 따른 분사유량(동일 설정압력) 45
2. 운전 조건에 따른 레일 압력 특성 52
1) 분사 펄스폭 따른 레일 압력(동일 레일 체적) 53
2) 운전 속도에 따른 레일 압력(동일 분사 펄스폭) 56
3. 레일의 압력변동 특성 59
V. 결론 및 시사점 68
참고문헌 70
Abstract 71
Table 3.1. Specifications of fuel rail 17
Table 3.2. Specifications of injector 18
Table 3.3. Specifications of pressure sensor and amplifier 19
Table 3.4. Specifications of Oscilloscope 20
Table 3.5. Condition of injector driver and test 21
Fig. 2.1. Example of optimized NG engine full load performance 14
Fig. 3.1. Schematics of injection quantity measuring rig 17
Fig. 4.1. Injection per pulse as a function of setting pressure according to... 23
Fig. 4.2. Injection per pulse as a function of setting pressure according to... 25
Fig. 4.3. Injection per pulse as a function of setting pressure according to... 28
Fig. 4.4. Injection per pulse as a function of setting pressure according to... 29
Fig. 4.5. Injection per pulse as a function of injection period according to... 31
Fig. 4.6. Injection per pulse as a function of injection period according to... 32
Fig. 4.7. Injection per pulse as a function of injection period according to... 34
Fig. 4.8. Injection per pulse as a function of injection period according to... 35
Fig. 4.9. Injection per pulse as a function of engine speed according to... 39
Fig. 4.10. Injection per pulse as a function of engine speed according to... 42
Fig. 4.11. Injection per pulse as a function of engine speed according to... 43
Fig. 4.12. Injection per pulse as a function of engine speed according to... 44
Fig. 4.13. InjInjection per pulse as a function of engine speed according to... 46
Fig. 4.14. Injection per pulse as a function of engine speed according to... 47
Fig. 4.15. Injection per pulse as a function of engine speed according to... 50
Fig. 4.16. Injection per pulse as a function of engine speed according to... 51
Fig. 4.17. Rail pressure as a function of injection period according to rail... 54
Fig. 4.18. Rail pressure as a function of injection period according to rail... 55
Fig. 4.19. Rail pressure as a function of engine speed according to injection... 57
Fig. 4.20. Rail pressure as a function of engine speed according to injection... 58
Fig. 4.21. In-rail pressure fluctuation as a crank angle base according to... 60
Fig. 4.22. In-rail pressure fluctuation as a crank angle base according to... 61
Fig. 4.23. In-rail pressure fluctuation as a crank angle base according to... 62
Fig. 4.24. In-rail pressure fluctuation as a crank angle base according to... 63
Fig. 4.25. In-rail pressure fluctuation as a crank angle base according to... 66
Fig. 4.26. In-rail pressure fluctuation as a crank angle base according to... 67
Photo 3.1. Fuel rail for experiment 18
Photo 3.2. Fuel Injector 19
Photo 3.3. Injector Controller(IC 5460) and pressure regulator 19
Photo 3.4. Pressure sensor and piezo-resistive amplifier 20