Effect of spark timing on the performance of a hybrid hydrogen-gasoline engine at lean conditions
Effect of spark timing on the performance of a hybrid hydrogen-gasoline engine at lean conditions
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稀燃条件下火花正时对氢-汽油混合动力发动机性能的影响
DOI：
10.1016/j.ijhydene.2010.01.003
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发表时间：
2010-03
影响因子：
7.2
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Ji, Changwei;Wang, Shuofeng;Zhang, Bo
氢气添加是改善火花点火发动机在化学计量比特别是稀薄条件下性能的有效方法。点火正时对发动机性能也有很大影响。通过实验研究了点火提前角对富氢汽油机稀薄工况性能的影响。试验是在一台四缸进气喷射汽油机上进行的，在保持原汽油喷射系统不变的情况下，通过在进气歧管上增加氢气进气喷射系统，将其改装成电控氢气-汽油混合发动机。开发了一种混合电子控制单元(HECU)来控制氢气和汽油的喷射时间和持续时间，以强制在进气口以预期的混合水平和过剩空气系数及时混合氢气和汽油。在试验过程中，发动机转速固定在1400rpm，歧管绝对压力(MAP)保持在61.5kPa.通过调整喷氢时间，使进气中的氢气体积分数由0%提高到3%。对于特定的氢气添加水平，汽油喷射持续时间被缩短，以确保发动机分别在1.2和1.4的两个过剩空气系数下运行。对于特定的氢气添加水平和过量空气系数，点火时间从20°CA到50°CA BTDC变化，间隔为2°CA。试验结果表明，指示平均有效压力(IMEP)随点火提前角的增大呈现先增大后减小的趋势。最大值的最佳点火时机。在指定的过量空气系数下，HHGE的IMEP(OST)被延迟。最大限度的。指示热效率出现在OST处。随着点火提前角的减小，火焰发展周期缩短，火焰传播周期延长。指示平均有效压力的变异系数一般在OST时达到最小值。随着点火提前时间的推迟，HC和NOx的排放量不断降低。然而，点火提前对CO排放的影响不显著。
Hydrogen addition is an effective way for improving the performance of spark-ignited (SI) engines at stoichiometric and especially lean conditions. Spark timing also heavily influences the SI engine performance. This paper experimentally investigated the effect of spark timing on performance of a hydrogen-enriched gasoline engine at lean conditions. The experiment was carried out on a four-cylinder, port-injection gasoline engine which was modified to be an electronically controlled hybrid hydrogen–gasoline engine (HHGE) by adding a hydrogen port-injection system on the intake manifolds while keeping the original gasoline injection system unchanged. A hybrid electronic control unit (HECU) was developed to govern the injection timings and durations of hydrogen and gasoline to enforce the timely mixing of hydrogen and gasoline in the intake ports at the expected blending levels and excess air ratios. During the test, the engine speed was fixed at 1400rpm and the manifolds absolute pressure (MAP) was kept at 61.5kPa. The hydrogen volume fraction in the intake was increased from 0% to 3% through adjusting the hydrogen injection duration. For a specified hydrogen addition level, gasoline injection duration was reduced to ensure the engine operating at two excess air ratios of 1.2 and 1.4, respectively. The spark timing for a specified hydrogen addition level and excess air ratio was varied from 20 to 50 °CA BTDC with an interval of 2 °CA. The test results showed that the indicated mean effective pressure (Imep) first increased and then decreased with the increase of spark advance. The optimum spark timing for the max. Imep (OST) was retarded for the HHGE at a specified excess air ratio. The max. indicated thermal efficiency appeared at the OST. Flame development period was shortened whereas flame propagation period was prolonged with the decrease of spark advance. The coefficient of variation in indicated mean effective pressure generally gained its minimum value at the OST. HC and NOx emissions were continuously decreased with the retarding of spark timing. However, the effect of spark timing on CO emission was found insignificant.
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影响因子：
7.2
作者：
Ma, Fanhua;Wang, Yu;Ding, Shangfen
通讯作者：
Ding, Shangfen
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影响因子：
7.2
作者：
Zhang X X;Yan W M;Su A;Wang X D;Lee D J
通讯作者：
Lee D J
影响因子：
7.2
作者：
H. A. K. S. Al-Janabi;M. Al-Baghdadi
通讯作者：
H. A. K. S. Al-Janabi;M. Al-Baghdadi
影响因子：
7.2
作者：
M. Al-Baghdadi
通讯作者：
M. Al-Baghdadi
DOI：
10.1201/9781439894972-14
发表时间：
2010-08
期刊：
--
影响因子：
--
作者：
Iqbal Husain
通讯作者：
Iqbal Husain