中文摘要：

为提高汽油机怠速时的经济性,在一台加装了电控氢气喷射系统的四缸汽油机上针对进气混氢体积分数、停缸、稀燃及降低怠速转速对汽油机怠速燃料能量消耗量的影响进行试验研究.试验中,通过停止发动机指定气缸的燃料供给实现停缸运行.结果表明,加大进气混氢体积分数、停缸及降低怠速转速均可有效提高汽油机怠速时的经济性.其中进气混氢结合停缸的方式最利于减少汽油机怠速时的燃料能量消耗量.在2缸停止燃烧、做功且进气混氢体积分数为6.63%的条件下,发动机怠速能量消耗量较原机降低约40.07%.但由于加大混合气过量空气系数后缸内燃料燃烧持续期延长,因此在怠速阶段采用稀燃方式并不能明显降低混氢汽油机的怠速燃料能量消耗量。

英文摘要：

To improve the idle economic performance of a gasoline engine,this paper experimentally investigats the effects of hydrogen addition fraction,cylinder cutoff,lean combustion and reducing idle speed on the engine fuel energy consumption at idle.The experiment was carried out on a four-cylinder gasoline engine equipped with an electronically controlled hydrogen port injection system.In the experiment,the cylinder closure was realized by stopping the fuel supply to the specified cylinders.Results show that increasing the hydrogen volume fraction in the intake,cylinder cutoff and reducing the idle speed are all capable of enhancing the engine economic performance at idle.Among all tested methods,the combination of hydrogen addition and cylinder closure is the most effective in decreasing the engine idle fuel energy consumption.At a hydrogen volume fraction in the intake of 6.63% and two-cylinder cutoff mode,the engine fuel energy consumption is reduced by 40.07%,compared with that of the original engine.However,because of the prolonged combustion duration,the application of lean combustion is not able to further decrease the fuel energy consumption of a hydrogen-blended gasoline engine at idle.