| 卢康博,任正敏,杨凯,等.喷油策略对柴油机高原起动过程性能影响研究[J].内燃机工程,2023,44(5):1-7. |
| 喷油策略对柴油机高原起动过程性能影响研究 |
| Influences of Fuel Injection Strategies on the Starting Performance of A Diesel Engine at High Altitudes |
| DOI：10.13949/j.cnki.nrjgc.2023.05.001 |
| 关键词:柴油机 高海拔 起动 轨压 循环喷油量 |
| Key Words:diesel engine high altitude start rail pressure cycle fuel injectionquantity |
| 基金项目:国家自然科学基金重点项目（51576129） |
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| 摘要:基于高原环境模拟装置，以单缸柴油机为试验对象，进行了0~4 000 m海拔起动性能试验，研究了喷油策略对柴油机变海拔起动性能的影响。结果表明，海拔从0增至4 000 m的过程中，起动升速期和过渡期时间分别延长14.2%、15.8%。平原工况下，随着轨压的提高，过渡期先增加后降低，但升速期逐渐降低，起动总时间缩短。海拔4 000 m时，过渡期与升速期均随轨压先增加后降低。在平原工况下，采用阶梯型喷油策略能够有效缩短过渡期，减少起动时间， 起动时间较原机策略缩短6.1%，提高过渡转速能够抑制转速上冲，缩短起动时间。当海拔为4 000 m时，增加初始阶段循环喷油量及过渡转速均能缩短过渡时间，改善起动性能。 |
| Abstract:An experimental study was conducted to investigate the effect of fuel injection strategy on the performance of diesel engines during starting process at different altitudes. The tests were carried out on a single diesel engine with a plateau simulator to stimulate altitudes from 0 to 4 000 m. The result shows that as the altitude increases from 0 to 4 000 m， the transition time and speed-up time of the diesel engine in starting process are prolonged by 14.2% and 15.8%， respectively. Under plain conditions， with the increase of rail pressure， the transition time decreases， and the total starting time shortens. At the altitude of 4 000 m， the transition time and speed-up time both increase first and then decrease with the rail pressure. The fuel injection quantity change with the speed step can reduce the speed transition time and increase the speed-up time during starting process under plain conditions， and the total time is 6.1% shorter than that under the original engine working condition. Increasing the transition speed can inhibit the speed upsurge and shorten the start time. At the altitude of 4 000 m， increasing the initial stage of cycle fuel injection quantity and transition speed can significantly improve the starting performance. |
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