CAJ | 학술논문

对一台4缸进气道燃料喷射( PFI)氢内燃机进行试验,研究当量燃空比、点火提前角和热废气再循环对其NOx 排放的影响和这些规律与转速的相关性。结果表明,当量燃空比是决定NOx 的关键因素,在当量燃空比大于0.5时NOx 排放随当量燃空比的增加急剧上升,在当量燃空比约为0.9时,出现接近10000×10-6的峰值；且转速越低,NOx 排放的峰值越低,峰值对应的当量燃空比越小。当量燃空比在0.5~0.7范围内时,减小点火提前角可大大降低NOx 排放,且转速越低,降低的程度越显著；采用热EGR也可显著减少NOx 排放,且转速越低,效果越明显。
대일태4항진기도연료분사( PFI)경내연궤진행시험,연구당량연공비、점화제전각화열폐기재순배대기NOx 배방적영향화저사규률여전속적상관성。결과표명,당량연공비시결정NOx 적관건인소,재당량연공비대우0.5시NOx 배방수당량연공비적증가급극상승,재당량연공비약위0.9시,출현접근10000×10-6적봉치；차전속월저,NOx 배방적봉치월저,봉치대응적당량연공비월소。당량연공비재0.5~0.7범위내시,감소점화제전각가대대강저NOx 배방,차전속월저,강저적정도월현저；채용열EGR야가현저감소NOx 배방,차전속월저,효과월명현。
A test is conducted to study the effects of the equivalent fuel air ratio ( FAR) , ignition advance angle, exhaust gas recirculation ( EGR) and engine speed on the NOx emission from a 4 cylinder port fuel injection ( PFI ) hydrogen internal combustion engine. The results show that the equivalent FAR is the key factor to the for-mation of NOx. When the equivalent FAR is larger than 0. 5, the NOx emission increases quickly with equivalent FAR and reaches its peak (10,000í10-6 ) at an equivalent FAR of around 0. 9, and with the fall in engine speed the peak NOx emission lowers and corresponding equivalent FAR reduces;When the equivalent FAR is in the range of 0. 5~0. 7, the retard in ignition angle leads to the great reduction in NOx emission, and the lower the engine speed, the more the reduction in NOx emission;The adoption of hot EGR also results in obvious fall in NOx emission and the lower the engine speed, the more decrease the NOx emission.