燃油共轨压力对汽油机性能和排放影响的试验研究

Experimental Research on Effect of Rail Pressure on Engine Performance and Emissions

以一款2. 0 L增压直喷双可变气门正时(VVT)汽油机为研究对象,在转速为3 000r/min、相对充气量为150%工况点进行发动机台架试验,研究不同的燃油共轨压力对发动机性能和排放的影响。试验结果表明,当共轨压力低于20 MPa,平均有效压力,即扭矩明显下降,燃油耗率明显上升;当共轨压力在25 MPa以下时,随着共轨压力的提高,氮氧化物(NOx)排放下降;当共轨压力在30 MPa以下时,随着共轨压力的提高,碳氢(HC)及颗粒物数量(PN)排放下降;当共轨压力从30 MPa提高至35 MPa时,HC、NOx及PN排放无明显变化。

The effect of rail pressure on gasoline engine performance and emissions at 3000r/min with 150% of relative air-charging was experimentally researched on a 2.0L turbocharged gasoline direct injection engine;The test result shows that indicated mean effective pressure（MEP）or torque reduces and brake specific fuel consumption（BSFC）increases significantly when rail pressure is lower than 20 MPa;NOx emissions decrease with the increase of rail pressure when the rail pressure is below 25 MPa,so do HC and PN emissions when the reil pressure is below 30MPa;HC,NOx and PN emissions have a little change when rail pressure is increased from 30MPa to 35MPa.