为探索氢内燃机的循环变动特性，基于一台2.0,L 进气道喷射式氢内燃机，开展了氢内燃机循环变动特性及影响因素的试验研究．试验结果表明：平均指示压力的循环变动系数是评价氢内燃机循环变动特性的理想特征参数；怠速转速越高，氢内燃机的循环变动越小；随混合气浓度提高，氢内燃机循环变动显著减小，点火提前角对循环变动的影响变弱，同时循环变动系数最小时对应的点火提前角逐渐趋近压缩上止点；节气门开度在0～20%范围时，随节气门开度增大循环变动显著减小；在怠速工况下，进气过程中喷氢会导致氢内燃机循环变动增加．%The cycle variation characteristics of a 2.0,L port fuel injection hydrogen internal combustion engine(PFI-HICE)have been extensively investigated. The results show that the covariance of indicated mean effective pressure Cimep is the best parameter for evaluating the cycle variations in the PFI-HICE. Cimep decreases with the increase of idle speed or fuel-air ratio. The effect of ignition advance angle on Cimep diminishes as fuel-air ratio increases. The ignition advance angles that correspond to the minimum Cimep of the PFI-HICE decrease as fuel-air ratio increases. The Cimep of the PFI-HICE rapidly decreases as throttle increases when the throttle is less than 20%. The Cimep increases when hy-drogen is injected in intake periods under idle conditions. These results indicate that the study on Cimep improves the stability of PFI-HICEs.
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