Suppression of super-knock in TC-GDI engine using two-stage injection in intake stroke (TSII)

Suppression of super-knock in TC-GDI engine using two-stage injection in intake stroke (TSII)
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采用进气冲程两级喷射(TSII)抑制 TC-GDI 发动机的超级爆震

DOI:
10.1007/s11431-013-5374-3
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发表时间:
2014
期刊:
Science in China - Series E: Technological Sciences
影响因子:
--
通讯作者:
Wang, Jianxin
Wang, Jianxin
中科院分区:
其他
文献类型:
--
作者:
Wang, Zhi;Xu, Yaqi;Wang, Jianxin

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涡轮增压和缸内直喷是汽油机节能的主要技术。但最大的挑战是超级爆震,其机理尚不清楚,迄今为止还没有有效的策略来抑制这种超级爆震。在一台增压直喷汽油机上,研究了喷油策略对超爆震的影响。结果表明,进气冲程(TSII)的两段喷射可以消除超爆震。同时,油耗、排放和排气温度均能保持在优化水平。通过5000次低速高负荷工况点的循环评价试验,对第一次喷射开始(SOI 1)、第二次喷射结束(EOI 2)和分次喷射比例(ROI 2)进行扫描,得到典型TC-GDI发动机的优化喷射策略为TSII,其中SOI 1在进气行程中间,EOI 2在进气行程末端,ROI 2为0.3。
Turbocharging and direct injection are main technologies used for energy-saving gasoline engines. But the biggest challenge is super-knock, whose mechanism is unclear and has no effective strategy to suppress this super-knock until now. The effects of injection strategies on super-knock were experimentally investigated in a turbocharged GDI engine. It was found that two-stage injections during intake stroke (TSII) can eliminate super-knock. Meanwhile, the fuel consumption, emissions and exhaust temperature can keep optimized level. By sweeping the start of the 1st injection (SOI1), end of the 2nd injection (EOI2) and the split injection ratios (ROI2) using 5000 cycles evaluation test at low-speed high load operating point, the optimized injection strategy for the typical TC-GDI engine is TSII with SOI1 at middle of intake stroke, EOI2 at end of intake stroke, and ROI2 of 0.3.
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