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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >Effects of split and single injection strategies on particle number emission and combustion of a GDI engine
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Effects of split and single injection strategies on particle number emission and combustion of a GDI engine

机译：分裂与单注射策略对GDI发动机粒子数发射及燃烧的影响

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摘要

Influence of fuel injection parameters of the single and split injection strategies on combustion, performance and particle number emission had been investigated on a gasoline direct injection engine with stoichiometric mixture combustion under medium and low engine operating conditions. The test results showed that the optimal injection timing for single injection strategy was about 290–280 °CA BTDC, and an earlier or a later injection timing could lead to a deterioration of particle number emission. For split injection strategy, the injected parameters also needed to be optimized subtly in order to improve particle number emission. When the inappropriate injected parameters were adopted, particle number emission increased rather than decrease when compared with single injection strategy. Similar to single injection strategy, when the second injection timing of split injection strategy further retarded from 280 °CA BTDC, the particle number emission and brake-specific fuel consumption also started to deteriorate, and the in-cylinder combustion process was delayed and slowed. The optimal first injection timing was about 300 °CA BTDC. When the first injection timing was delayed to 280 °CA BTDC with the second injection timing being 260 °CA BTDC, the particle number emission increased and the shortened interval time between first and second fuel injection might have had a negative effect. The smaller difference of the fuel quantity between the first and the second injection was not good for the improvement of particle number emission and brake-specific fuel consumption, and the best injection proportion was 2:8. Overall, the engine particle number emission could be decreased to some extent, which could reach about 10–30%, by split injection strategy with optimal control parameters at medium and low engine loads.
机译：在介质和低发动机操作条件下，在汽油直喷发动机上研究了单一和分裂注射策略对燃烧，性能和粒子数发射的影响，性能和粒子数发射的影响。测试结果表明，单喷射策略的最佳喷射时间约为290-280°Ca BTDC，并且较早或后续注射正时可能导致粒子数排放的劣化。对于分流注射策略，还需要将注入的参数巧妙地优化以改善粒子数发射。当采用不适当的注入参数时，与单喷射策略相比，粒子数发射增加而不是减少。类似于单喷射策略，当从280°CA BTDC进一步延迟的分流注射策略的第二喷射正时，粒子数发射和制动特定的燃料消耗也开始劣化，并且缸内燃烧过程延迟并减慢了。最佳的第一喷射正时约为300°Ca BTDC。当第一喷射定时延迟到280°CA BTDC时，通过第二喷射定时为260°Ca BTDC，粒子数发射增加并且第一和第二燃料喷射之间的间隔时间缩短可能具有负效应。第一和第二喷射之间的燃料量的较小差异不利于提高粒子数排放和制动特定燃料消耗，并且最好的注射比例为2：8。总的来说，通过在中间和低发动机负载下具有最佳控制参数的分流注射策略，可以减少发动机粒子数排放在一定程度上，这可能会达到大约10-30％。

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